Bump version to 0.52

// FREEBIE

config/sample.yml

@@ -1,32 +1,16 @@
-twilio:
-  accountId: 
+twilio: # Twilio SMS gateway configuration
+  accountId:
   accountToken:
   number:
   localDomain: # The domain Twilio can call back to.
-  international: # Boolean specifying Twilio for international delivery
 
-# Optional. If specified, Nexmo will be used for non-US SMS and 
-# voice verification if twilio.international is false. Otherwise,
-# Nexmo, if specified, Nexmo will only be used as a fallback
-# for failed Twilio deliveries.
-nexmo:
-  apiKey:
-  apiSecret:
-  number:
+push: # GCM/APN push server configuration
+  host:
+  port:
+  username:
+  password:
 
-gcm:
-  senderId:
-  apiKey: 
-
-# Optional. Only if iOS clients are supported.
-apn:
-  # In PEM format.
-  certificate: 
-  
-  # In PEM format.
-  key: 
-
-s3:
+s3: # AWS S3 configuration
   accessKey: 
   accessSecret: 
 
@@ -35,13 +19,37 @@ s3:
   # correct permissions.
   attachmentsBucket:
 
-memcache:
-  servers: 
-  user: 
-  password: 
+directory: # Redis server configuration for TS directory
+  url:
 
-redis:
-  url: 
+cache: # Redis server configuration for general purpose caching
+  url:
+
+websocket:
+  enabled: true
+
+messageStore: # Postgres database configuration for message store
+  driverClass: org.postgresql.Driver
+  user:
+  password:
+  url:
+
+database: # Postgres database configuration for account store
+  # the name of your JDBC driver
+  driverClass: org.postgresql.Driver
+
+  # the username
+  user:
+
+  # the password
+  password:
+
+  # the JDBC URL
+  url: jdbc:postgresql://somehost:somport/somedb
+
+  # any properties specific to your JDBC driver:
+  properties:
+    charSet: UTF-8
 
 federation:
   name:
@@ -52,24 +60,3 @@ federation:
       authenticationToken: foo
       certificate: in pem format 
 
-# Optional address of graphite server to report metrics
-graphite:
-  host:
-  port:
-
-database:
-  # the name of your JDBC driver
-  driverClass: org.postgresql.Driver
-
-  # the username
-  user: 
-
-  # the password
-  password: 
-
-  # the JDBC URL
-  url: jdbc:postgresql://somehost:somport/somedb
-
-  # any properties specific to your JDBC driver:
-  properties:
-    charSet: UTF-8

pom.xml

@@ -9,7 +9,7 @@
 
     <groupId>org.whispersystems.textsecure</groupId>
     <artifactId>TextSecureServer</artifactId>
-    <version>0.26</version>
+    <version>0.52</version>
 
     <properties>
         <dropwizard.version>0.7.1</dropwizard.version>
@@ -54,9 +54,9 @@
             <version>${dropwizard.version}</version>
         </dependency>
         <dependency>
-            <groupId>io.dropwizard</groupId>
-            <artifactId>dropwizard-client</artifactId>
-            <version>${dropwizard.version}</version>
+            <groupId>com.dcsquare</groupId>
+            <artifactId>dropwizard-papertrail</artifactId>
+            <version>1.1</version>
         </dependency>
 
 
@@ -86,16 +86,6 @@
             <artifactId>gcm-server</artifactId>
             <version>1.0.2</version>
         </dependency>
-        <dependency>
-            <groupId>com.google.code.gson</groupId>
-            <artifactId>gson</artifactId>
-            <version>2.2.2</version>
-        </dependency>
-        <dependency>
-            <groupId>net.spy</groupId>
-            <artifactId>spymemcached</artifactId>
-            <version>2.10.1</version>
-        </dependency>
         <dependency>
             <groupId>com.notnoop.apns</groupId>
             <artifactId>apns</artifactId>
@@ -116,7 +106,7 @@
         <dependency>
             <groupId>redis.clients</groupId>
             <artifactId>jedis</artifactId>
-            <version>2.2.1</version>
+            <version>2.6.2</version>
             <type>jar</type>
             <scope>compile</scope>
         </dependency>
@@ -137,12 +127,11 @@
             <version>4.0.0</version>
         </dependency>
         <dependency>
-            <groupId>org.whispersystems.websocket</groupId>
+            <groupId>org.whispersystems</groupId>
             <artifactId>websocket-resources</artifactId>
-            <version>0.1-SNAPSHOT</version>
+            <version>0.2.3</version>
         </dependency>
 
-
     </dependencies>
 
     <dependencyManagement>

protobuf/Makefile

@@ -1,3 +1,3 @@
 
 all:
-	protoc --java_out=../src/main/java/ OutgoingMessageSignal.proto
+	protoc --java_out=../src/main/java/ TextSecure.proto PubSubMessage.proto

protobuf/PubSubMessage.proto

@@ -1,5 +1,5 @@
 /**
- * Copyright (C) 2013 Open WhisperSystems
+ * Copyright (C) 2014 Open Whisper Systems
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU Affero General Public License as published by
@@ -14,33 +14,20 @@
  * You should have received a copy of the GNU Affero General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
-package org.whispersystems.textsecuregcm.configuration;
+package textsecure;
 
-import com.fasterxml.jackson.annotation.JsonProperty;
-import org.hibernate.validator.constraints.NotEmpty;
+option java_package = "org.whispersystems.textsecuregcm.storage";
+option java_outer_classname = "PubSubProtos";
 
-public class MemcacheConfiguration {
-
-  @NotEmpty
-  @JsonProperty
-  private String servers;
-
-  @JsonProperty
-  private String user;
-
-  @JsonProperty
-  private String password;
-
-
-  public String getServers() {
-    return servers;
+message PubSubMessage {
+  enum Type {
+    UNKNOWN   = 0;
+    QUERY_DB  = 1;
+    DELIVER   = 2;
+    KEEPALIVE = 3;
+    CLOSE     = 4;
   }
 
-  public String getUser() {
-    return user;
-  }
-
-  public String getPassword() {
-    return password;
-  }
+  optional Type  type    = 1;
+  optional bytes content = 2;
 }

protobuf/StoredMessage.proto

@@ -0,0 +1,30 @@
+/**
+ * Copyright (C) 2014 Open Whisper Systems
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package textsecure;
+
+option java_package = "org.whispersystems.textsecuregcm.storage";
+option java_outer_classname = "StoredMessageProtos";
+
+message StoredMessage {
+  enum Type {
+    UNKNOWN = 0;
+    MESSAGE = 1;
+  }
+
+  optional Type  type    = 1;
+  optional bytes content = 2;
+}

protobuf/TextSecure.proto

@@ -1,5 +1,5 @@
 /**
- * Copyright (C) 2013 Open WhisperSystems
+ * Copyright (C) 2013 - 2015 Open WhisperSystems
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU Affero General Public License as published by
@@ -19,21 +19,24 @@ package textsecure;
 option java_package = "org.whispersystems.textsecuregcm.entities";
 option java_outer_classname = "MessageProtos";
 
-message OutgoingMessageSignal {
+message Envelope {
   enum Type {
     UNKNOWN       = 0;
     CIPHERTEXT    = 1;
     KEY_EXCHANGE  = 2;
     PREKEY_BUNDLE = 3;
-    PLAINTEXT     = 4;
     RECEIPT       = 5;
   }
 
-  optional uint32 type = 1;
-  optional string source = 2;
-  optional  uint32 sourceDevice = 7;
-  optional string relay = 3;
-//  repeated string destinations = 4;
-  optional uint64 timestamp = 5;
-  optional bytes message = 6;
+  optional Type   type          = 1;
+  optional string source        = 2;
+  optional uint32 sourceDevice  = 7;
+  optional string relay         = 3;
+  optional uint64 timestamp     = 5;
+  optional bytes  legacyMessage = 6; // Contains an encrypted DataMessage
+  optional bytes  content       = 8; // Contains an encrypted Content
+}
+
+message ProvisioningUuid {
+  optional string uuid = 1;
 }

src/main/java/org/whispersystems/dispatch/DispatchChannel.java

@@ -0,0 +1,7 @@
+package org.whispersystems.dispatch;
+
+public interface DispatchChannel {
+  public void onDispatchMessage(String channel, byte[] message);
+  public void onDispatchSubscribed(String channel);
+  public void onDispatchUnsubscribed(String channel);
+}

src/main/java/org/whispersystems/dispatch/DispatchManager.java

@@ -0,0 +1,172 @@
+package org.whispersystems.dispatch;
+
+import com.google.common.base.Optional;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.whispersystems.dispatch.io.RedisPubSubConnectionFactory;
+import org.whispersystems.dispatch.redis.PubSubConnection;
+import org.whispersystems.dispatch.redis.PubSubReply;
+
+import java.io.IOException;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.Executor;
+import java.util.concurrent.Executors;
+
+public class DispatchManager extends Thread {
+
+  private final Logger                       logger        = LoggerFactory.getLogger(DispatchManager.class);
+  private final Executor                     executor      = Executors.newCachedThreadPool();
+  private final Map<String, DispatchChannel> subscriptions = new ConcurrentHashMap<>();
+
+  private final Optional<DispatchChannel>    deadLetterChannel;
+  private final RedisPubSubConnectionFactory redisPubSubConnectionFactory;
+
+  private          PubSubConnection pubSubConnection;
+  private volatile boolean          running;
+
+  public DispatchManager(RedisPubSubConnectionFactory redisPubSubConnectionFactory,
+                         Optional<DispatchChannel> deadLetterChannel)
+  {
+    this.redisPubSubConnectionFactory = redisPubSubConnectionFactory;
+    this.deadLetterChannel            = deadLetterChannel;
+  }
+
+  @Override
+  public void start() {
+    this.pubSubConnection = redisPubSubConnectionFactory.connect();
+    this.running          = true;
+    super.start();
+  }
+
+  public void shutdown() {
+    this.running = false;
+    this.pubSubConnection.close();
+  }
+
+  public synchronized void subscribe(String name, DispatchChannel dispatchChannel) {
+    Optional<DispatchChannel> previous = Optional.fromNullable(subscriptions.get(name));
+    subscriptions.put(name, dispatchChannel);
+
+    try {
+      pubSubConnection.subscribe(name);
+    } catch (IOException e) {
+      logger.warn("Subscription error", e);
+    }
+
+    if (previous.isPresent()) {
+      dispatchUnsubscription(name, previous.get());
+    }
+  }
+
+  public synchronized void unsubscribe(String name, DispatchChannel channel) {
+    Optional<DispatchChannel> subscription = Optional.fromNullable(subscriptions.get(name));
+
+    if (subscription.isPresent() && subscription.get() == channel) {
+      subscriptions.remove(name);
+
+      try {
+        pubSubConnection.unsubscribe(name);
+      } catch (IOException e) {
+        logger.warn("Unsubscribe error", e);
+      }
+
+      dispatchUnsubscription(name, subscription.get());
+    }
+  }
+
+  public boolean hasSubscription(String name) {
+    return subscriptions.containsKey(name);
+  }
+
+  @Override
+  public void run() {
+    while (running) {
+      try {
+        PubSubReply reply = pubSubConnection.read();
+
+        switch (reply.getType()) {
+          case UNSUBSCRIBE:                             break;
+          case SUBSCRIBE:   dispatchSubscribe(reply);   break;
+          case MESSAGE:     dispatchMessage(reply);     break;
+          default:          throw new AssertionError("Unknown pubsub reply type! " + reply.getType());
+        }
+      } catch (IOException e) {
+        logger.warn("***** PubSub Connection Error *****", e);
+        if (running) {
+          this.pubSubConnection.close();
+          this.pubSubConnection = redisPubSubConnectionFactory.connect();
+          resubscribeAll();
+        }
+      }
+    }
+
+    logger.warn("DispatchManager Shutting Down...");
+  }
+
+  private void dispatchSubscribe(final PubSubReply reply) {
+    Optional<DispatchChannel> subscription = Optional.fromNullable(subscriptions.get(reply.getChannel()));
+
+    if (subscription.isPresent()) {
+      dispatchSubscription(reply.getChannel(), subscription.get());
+    } else {
+      logger.warn("Received subscribe event for non-existing channel: " + reply.getChannel());
+    }
+  }
+
+  private void dispatchMessage(PubSubReply reply) {
+    Optional<DispatchChannel> subscription = Optional.fromNullable(subscriptions.get(reply.getChannel()));
+
+    if (subscription.isPresent()) {
+      dispatchMessage(reply.getChannel(), subscription.get(), reply.getContent().get());
+    } else if (deadLetterChannel.isPresent()) {
+      dispatchMessage(reply.getChannel(), deadLetterChannel.get(), reply.getContent().get());
+    } else {
+      logger.warn("Received message for non-existing channel, with no dead letter handler: " + reply.getChannel());
+    }
+  }
+
+  private void resubscribeAll() {
+    new Thread() {
+      @Override
+      public void run() {
+        synchronized (DispatchManager.this) {
+          try {
+            for (String name : subscriptions.keySet()) {
+              pubSubConnection.subscribe(name);
+            }
+          } catch (IOException e) {
+            logger.warn("***** RESUBSCRIPTION ERROR *****", e);
+          }
+        }
+      }
+    }.start();
+  }
+
+  private void dispatchMessage(final String name, final DispatchChannel channel, final byte[] message) {
+    executor.execute(new Runnable() {
+      @Override
+      public void run() {
+        channel.onDispatchMessage(name, message);
+      }
+    });
+  }
+
+  private void dispatchSubscription(final String name, final DispatchChannel channel) {
+    executor.execute(new Runnable() {
+      @Override
+      public void run() {
+        channel.onDispatchSubscribed(name);
+      }
+    });
+  }
+
+  private void dispatchUnsubscription(final String name, final DispatchChannel channel) {
+    executor.execute(new Runnable() {
+      @Override
+      public void run() {
+        channel.onDispatchUnsubscribed(name);
+      }
+    });
+  }
+}

src/main/java/org/whispersystems/dispatch/io/RedisInputStream.java

@@ -0,0 +1,64 @@
+package org.whispersystems.dispatch.io;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+
+public class RedisInputStream {
+
+  private static final byte CR = 0x0D;
+  private static final byte LF = 0x0A;
+
+  private final InputStream inputStream;
+
+  public RedisInputStream(InputStream inputStream) {
+    this.inputStream = inputStream;
+  }
+
+  public String readLine() throws IOException {
+    ByteArrayOutputStream boas = new ByteArrayOutputStream();
+
+    boolean foundCr = false;
+
+    while (true) {
+      int character = inputStream.read();
+
+      if (character == -1) {
+        throw new IOException("Stream closed!");
+      }
+
+      boas.write(character);
+
+      if      (foundCr && character == LF) break;
+      else if (character == CR)            foundCr = true;
+      else if (foundCr)                    foundCr = false;
+    }
+
+    byte[] data = boas.toByteArray();
+    return new String(data, 0, data.length-2);
+  }
+
+  public byte[] readFully(int size) throws IOException {
+    byte[] result    = new byte[size];
+    int    offset    = 0;
+    int    remaining = result.length;
+
+    while (remaining > 0) {
+      int read = inputStream.read(result, offset, remaining);
+
+      if (read < 0) {
+        throw new IOException("Stream closed!");
+      }
+
+      offset    += read;
+      remaining -= read;
+    }
+
+    return result;
+  }
+
+  public void close() throws IOException {
+    inputStream.close();
+  }
+
+}

src/main/java/org/whispersystems/dispatch/io/RedisPubSubConnectionFactory.java

@@ -0,0 +1,9 @@
+package org.whispersystems.dispatch.io;
+
+import org.whispersystems.dispatch.redis.PubSubConnection;
+
+public interface RedisPubSubConnectionFactory {
+
+  public PubSubConnection connect();
+
+}

src/main/java/org/whispersystems/dispatch/redis/PubSubConnection.java

@@ -0,0 +1,119 @@
+package org.whispersystems.dispatch.redis;
+
+import com.google.common.base.Optional;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.whispersystems.dispatch.io.RedisInputStream;
+import org.whispersystems.dispatch.redis.protocol.ArrayReplyHeader;
+import org.whispersystems.dispatch.redis.protocol.IntReply;
+import org.whispersystems.dispatch.redis.protocol.StringReplyHeader;
+import org.whispersystems.dispatch.util.Util;
+
+import java.io.BufferedInputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.net.Socket;
+import java.util.Arrays;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+public class PubSubConnection {
+
+  private final Logger logger = LoggerFactory.getLogger(PubSubConnection.class);
+
+  private static final byte[] UNSUBSCRIBE_TYPE    = {'u', 'n', 's', 'u', 'b', 's', 'c', 'r', 'i', 'b', 'e'     };
+  private static final byte[] SUBSCRIBE_TYPE      = {'s', 'u', 'b', 's', 'c', 'r', 'i', 'b', 'e'               };
+  private static final byte[] MESSAGE_TYPE        = {'m', 'e', 's', 's', 'a', 'g', 'e'                         };
+
+  private static final byte[] SUBSCRIBE_COMMAND   = {'S', 'U', 'B', 'S', 'C', 'R', 'I', 'B', 'E', ' '          };
+  private static final byte[] UNSUBSCRIBE_COMMAND = {'U', 'N', 'S', 'U', 'B', 'S', 'C', 'R', 'I', 'B', 'E', ' '};
+  private static final byte[] CRLF                = {'\r', '\n'                                                };
+
+  private final OutputStream     outputStream;
+  private final RedisInputStream inputStream;
+  private final Socket           socket;
+  private final AtomicBoolean    closed;
+
+  public PubSubConnection(Socket socket) throws IOException {
+    this.socket       = socket;
+    this.outputStream = socket.getOutputStream();
+    this.inputStream  = new RedisInputStream(new BufferedInputStream(socket.getInputStream()));
+    this.closed       = new AtomicBoolean(false);
+  }
+
+  public void subscribe(String channelName) throws IOException {
+    if (closed.get()) throw new IOException("Connection closed!");
+
+    byte[] command = Util.combine(SUBSCRIBE_COMMAND, channelName.getBytes(), CRLF);
+    outputStream.write(command);
+  }
+
+  public void unsubscribe(String channelName) throws IOException {
+    if (closed.get()) throw new IOException("Connection closed!");
+
+    byte[] command = Util.combine(UNSUBSCRIBE_COMMAND, channelName.getBytes(), CRLF);
+    outputStream.write(command);
+  }
+
+  public PubSubReply read() throws IOException {
+    if (closed.get()) throw new IOException("Connection closed!");
+
+    ArrayReplyHeader replyHeader = new ArrayReplyHeader(inputStream.readLine());
+
+    if (replyHeader.getElementCount() != 3) {
+      throw new IOException("Received array reply header with strange count: " + replyHeader.getElementCount());
+    }
+
+    StringReplyHeader replyTypeHeader = new StringReplyHeader(inputStream.readLine());
+    byte[]            replyType       = inputStream.readFully(replyTypeHeader.getStringLength());
+    inputStream.readLine();
+
+    if      (Arrays.equals(SUBSCRIBE_TYPE, replyType))   return readSubscribeReply();
+    else if (Arrays.equals(UNSUBSCRIBE_TYPE, replyType)) return readUnsubscribeReply();
+    else if (Arrays.equals(MESSAGE_TYPE, replyType))     return readMessageReply();
+    else throw new IOException("Unknown reply type: " + new String(replyType));
+  }
+
+  public void close() {
+    try {
+      this.closed.set(true);
+      this.inputStream.close();
+      this.outputStream.close();
+      this.socket.close();
+    } catch (IOException e) {
+      logger.warn("Exception while closing", e);
+    }
+  }
+
+  private PubSubReply readMessageReply() throws IOException {
+    StringReplyHeader channelNameHeader = new StringReplyHeader(inputStream.readLine());
+    byte[]            channelName       = inputStream.readFully(channelNameHeader.getStringLength());
+    inputStream.readLine();
+
+    StringReplyHeader messageHeader = new StringReplyHeader(inputStream.readLine());
+    byte[]            message       = inputStream.readFully(messageHeader.getStringLength());
+    inputStream.readLine();
+
+    return new PubSubReply(PubSubReply.Type.MESSAGE, new String(channelName), Optional.of(message));
+  }
+
+  private PubSubReply readUnsubscribeReply() throws IOException {
+    String channelName = readSubscriptionReply();
+    return new PubSubReply(PubSubReply.Type.UNSUBSCRIBE, channelName, Optional.<byte[]>absent());
+  }
+
+  private PubSubReply readSubscribeReply() throws IOException {
+    String channelName = readSubscriptionReply();
+    return new PubSubReply(PubSubReply.Type.SUBSCRIBE, channelName, Optional.<byte[]>absent());
+  }
+
+  private String readSubscriptionReply() throws IOException {
+    StringReplyHeader channelNameHeader = new StringReplyHeader(inputStream.readLine());
+    byte[]            channelName       = inputStream.readFully(channelNameHeader.getStringLength());
+    inputStream.readLine();
+
+    IntReply subscriptionCount = new IntReply(inputStream.readLine());
+
+    return new String(channelName);
+  }
+
+}

src/main/java/org/whispersystems/dispatch/redis/PubSubReply.java

@@ -0,0 +1,35 @@
+package org.whispersystems.dispatch.redis;
+
+import com.google.common.base.Optional;
+
+public class PubSubReply {
+
+  public enum Type {
+    MESSAGE,
+    SUBSCRIBE,
+    UNSUBSCRIBE
+  }
+
+  private final Type             type;
+  private final String          channel;
+  private final Optional<byte[]> content;
+
+  public PubSubReply(Type type, String channel, Optional<byte[]> content) {
+    this.type    = type;
+    this.channel = channel;
+    this.content = content;
+  }
+
+  public Type getType() {
+    return type;
+  }
+
+  public String getChannel() {
+    return channel;
+  }
+
+  public Optional<byte[]> getContent() {
+    return content;
+  }
+
+}

src/main/java/org/whispersystems/dispatch/redis/protocol/ArrayReplyHeader.java

@@ -0,0 +1,24 @@
+package org.whispersystems.dispatch.redis.protocol;
+
+import java.io.IOException;
+
+public class ArrayReplyHeader {
+
+  private final int elementCount;
+
+  public ArrayReplyHeader(String header) throws IOException {
+    if (header == null || header.length() < 2 || header.charAt(0) != '*') {
+      throw new IOException("Invalid array reply header: " + header);
+    }
+
+    try {
+      this.elementCount = Integer.parseInt(header.substring(1));
+    } catch (NumberFormatException e) {
+      throw new IOException(e);
+    }
+  }
+
+  public int getElementCount() {
+    return elementCount;
+  }
+}

src/main/java/org/whispersystems/dispatch/redis/protocol/IntReply.java

@@ -0,0 +1,24 @@
+package org.whispersystems.dispatch.redis.protocol;
+
+import java.io.IOException;
+
+public class IntReply {
+
+  private final int value;
+
+  public IntReply(String reply) throws IOException {
+    if (reply == null || reply.length() < 2 || reply.charAt(0) != ':') {
+      throw new IOException("Invalid int reply: " + reply);
+    }
+
+    try {
+      this.value = Integer.parseInt(reply.substring(1));
+    } catch (NumberFormatException e) {
+      throw new IOException(e);
+    }
+  }
+
+  public int getValue() {
+    return value;
+  }
+}

src/main/java/org/whispersystems/dispatch/redis/protocol/StringReplyHeader.java

@@ -0,0 +1,24 @@
+package org.whispersystems.dispatch.redis.protocol;
+
+import java.io.IOException;
+
+public class StringReplyHeader {
+
+  private final int stringLength;
+
+  public StringReplyHeader(String header) throws IOException {
+    if (header == null || header.length() < 2 || header.charAt(0) != '$') {
+      throw new IOException("Invalid string reply header: " + header);
+    }
+
+    try {
+      this.stringLength = Integer.parseInt(header.substring(1));
+    } catch (NumberFormatException e) {
+      throw new IOException(e);
+    }
+  }
+
+  public int getStringLength() {
+    return stringLength;
+  }
+}

src/main/java/org/whispersystems/dispatch/util/Util.java

@@ -0,0 +1,36 @@
+package org.whispersystems.dispatch.util;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+
+public class Util {
+
+  public static byte[] combine(byte[]... elements) {
+    try {
+      int sum = 0;
+
+      for (byte[] element : elements) {
+        sum += element.length;
+      }
+
+      ByteArrayOutputStream baos = new ByteArrayOutputStream(sum);
+
+      for (byte[] element : elements) {
+        baos.write(element);
+      }
+
+      return baos.toByteArray();
+    } catch (IOException e) {
+      throw new AssertionError(e);
+    }
+  }
+
+
+  public static void sleep(long millis) {
+    try {
+      Thread.sleep(millis);
+    } catch (InterruptedException e) {
+      throw new AssertionError(e);
+    }
+  }
+}

src/main/java/org/whispersystems/textsecuregcm/WhisperServerConfiguration.java

@@ -17,24 +17,26 @@
 package org.whispersystems.textsecuregcm;
 
 import com.fasterxml.jackson.annotation.JsonProperty;
-import org.whispersystems.textsecuregcm.configuration.ApnConfiguration;
 import org.whispersystems.textsecuregcm.configuration.FederationConfiguration;
-import org.whispersystems.textsecuregcm.configuration.GcmConfiguration;
 import org.whispersystems.textsecuregcm.configuration.GraphiteConfiguration;
-import org.whispersystems.textsecuregcm.configuration.MemcacheConfiguration;
-import org.whispersystems.textsecuregcm.configuration.MetricsConfiguration;
 import org.whispersystems.textsecuregcm.configuration.NexmoConfiguration;
 import org.whispersystems.textsecuregcm.configuration.PushConfiguration;
 import org.whispersystems.textsecuregcm.configuration.RateLimitsConfiguration;
 import org.whispersystems.textsecuregcm.configuration.RedPhoneConfiguration;
 import org.whispersystems.textsecuregcm.configuration.RedisConfiguration;
 import org.whispersystems.textsecuregcm.configuration.S3Configuration;
+import org.whispersystems.textsecuregcm.configuration.TestDeviceConfiguration;
 import org.whispersystems.textsecuregcm.configuration.TwilioConfiguration;
 import org.whispersystems.textsecuregcm.configuration.WebsocketConfiguration;
 
 import javax.validation.Valid;
 import javax.validation.constraints.NotNull;
 
+import java.util.HashMap;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+
 import io.dropwizard.Configuration;
 import io.dropwizard.client.JerseyClientConfiguration;
 import io.dropwizard.db.DataSourceFactory;
@@ -62,12 +64,22 @@ public class WhisperServerConfiguration extends Configuration {
   @NotNull
   @Valid
   @JsonProperty
-  private MemcacheConfiguration memcache;
+  private RedisConfiguration cache;
 
   @NotNull
   @Valid
   @JsonProperty
-  private RedisConfiguration redis;
+  private RedisConfiguration directory;
+
+  @Valid
+  @NotNull
+  @JsonProperty
+  private DataSourceFactory messageStore;
+
+  @Valid
+  @NotNull
+  @JsonProperty
+  private List<TestDeviceConfiguration> testDevices = new LinkedList<>();
 
   @Valid
   @JsonProperty
@@ -87,10 +99,6 @@ public class WhisperServerConfiguration extends Configuration {
   @JsonProperty
   private GraphiteConfiguration graphite = new GraphiteConfiguration();
 
-  @Valid
-  @JsonProperty
-  private MetricsConfiguration viz = new MetricsConfiguration();
-
   @Valid
   @JsonProperty
   private WebsocketConfiguration websocket = new WebsocketConfiguration();
@@ -128,12 +136,16 @@ public class WhisperServerConfiguration extends Configuration {
     return s3;
   }
 
-  public MemcacheConfiguration getMemcacheConfiguration() {
-    return memcache;
+  public RedisConfiguration getCacheConfiguration() {
+    return cache;
   }
 
-  public RedisConfiguration getRedisConfiguration() {
-    return redis;
+  public RedisConfiguration getDirectoryConfiguration() {
+    return directory;
+  }
+
+  public DataSourceFactory getMessageStoreConfiguration() {
+    return messageStore;
   }
 
   public DataSourceFactory getDataSourceFactory() {
@@ -152,11 +164,18 @@ public class WhisperServerConfiguration extends Configuration {
     return graphite;
   }
 
-  public MetricsConfiguration getMetricsConfiguration() {
-    return viz;
-  }
-
   public RedPhoneConfiguration getRedphoneConfiguration() {
     return redphone;
   }
+
+  public Map<String, Integer> getTestDevices() {
+    Map<String, Integer> results = new HashMap<>();
+
+    for (TestDeviceConfiguration testDeviceConfiguration : testDevices) {
+      results.put(testDeviceConfiguration.getNumber(),
+                  testDeviceConfiguration.getCode());
+    }
+
+    return results;
+  }
 }

src/main/java/org/whispersystems/textsecuregcm/WhisperServerService.java

@@ -21,10 +21,11 @@ import com.codahale.metrics.graphite.GraphiteReporter;
 import com.fasterxml.jackson.databind.DeserializationFeature;
 import com.google.common.base.Optional;
 import com.sun.jersey.api.client.Client;
-import net.spy.memcached.MemcachedClient;
 import org.bouncycastle.jce.provider.BouncyCastleProvider;
 import org.eclipse.jetty.servlets.CrossOriginFilter;
 import org.skife.jdbi.v2.DBI;
+import org.whispersystems.dispatch.DispatchChannel;
+import org.whispersystems.dispatch.DispatchManager;
 import org.whispersystems.textsecuregcm.auth.AccountAuthenticator;
 import org.whispersystems.textsecuregcm.auth.FederatedPeerAuthenticator;
 import org.whispersystems.textsecuregcm.auth.MultiBasicAuthProvider;
@@ -35,28 +36,32 @@ import org.whispersystems.textsecuregcm.controllers.DeviceController;
 import org.whispersystems.textsecuregcm.controllers.DirectoryController;
 import org.whispersystems.textsecuregcm.controllers.FederationControllerV1;
 import org.whispersystems.textsecuregcm.controllers.FederationControllerV2;
+import org.whispersystems.textsecuregcm.controllers.KeepAliveController;
 import org.whispersystems.textsecuregcm.controllers.KeysControllerV1;
 import org.whispersystems.textsecuregcm.controllers.KeysControllerV2;
 import org.whispersystems.textsecuregcm.controllers.MessageController;
+import org.whispersystems.textsecuregcm.controllers.ProvisioningController;
 import org.whispersystems.textsecuregcm.controllers.ReceiptController;
 import org.whispersystems.textsecuregcm.federation.FederatedClientManager;
 import org.whispersystems.textsecuregcm.federation.FederatedPeer;
 import org.whispersystems.textsecuregcm.limits.RateLimiters;
+import org.whispersystems.textsecuregcm.liquibase.NameableMigrationsBundle;
+import org.whispersystems.textsecuregcm.mappers.DeviceLimitExceededExceptionMapper;
 import org.whispersystems.textsecuregcm.mappers.IOExceptionMapper;
+import org.whispersystems.textsecuregcm.mappers.InvalidWebsocketAddressExceptionMapper;
 import org.whispersystems.textsecuregcm.mappers.RateLimitExceededExceptionMapper;
 import org.whispersystems.textsecuregcm.metrics.CpuUsageGauge;
 import org.whispersystems.textsecuregcm.metrics.FreeMemoryGauge;
-import org.whispersystems.textsecuregcm.metrics.JsonMetricsReporter;
 import org.whispersystems.textsecuregcm.metrics.NetworkReceivedGauge;
 import org.whispersystems.textsecuregcm.metrics.NetworkSentGauge;
-import org.whispersystems.textsecuregcm.providers.MemcacheHealthCheck;
-import org.whispersystems.textsecuregcm.providers.MemcachedClientFactory;
 import org.whispersystems.textsecuregcm.providers.RedisClientFactory;
 import org.whispersystems.textsecuregcm.providers.RedisHealthCheck;
 import org.whispersystems.textsecuregcm.providers.TimeProvider;
+import org.whispersystems.textsecuregcm.push.ApnFallbackManager;
 import org.whispersystems.textsecuregcm.push.FeedbackHandler;
 import org.whispersystems.textsecuregcm.push.PushSender;
 import org.whispersystems.textsecuregcm.push.PushServiceClient;
+import org.whispersystems.textsecuregcm.push.ReceiptSender;
 import org.whispersystems.textsecuregcm.push.WebsocketSender;
 import org.whispersystems.textsecuregcm.sms.NexmoSmsSender;
 import org.whispersystems.textsecuregcm.sms.SmsSender;
@@ -66,15 +71,18 @@ import org.whispersystems.textsecuregcm.storage.AccountsManager;
 import org.whispersystems.textsecuregcm.storage.Device;
 import org.whispersystems.textsecuregcm.storage.DirectoryManager;
 import org.whispersystems.textsecuregcm.storage.Keys;
+import org.whispersystems.textsecuregcm.storage.Messages;
+import org.whispersystems.textsecuregcm.storage.MessagesManager;
 import org.whispersystems.textsecuregcm.storage.PendingAccounts;
 import org.whispersystems.textsecuregcm.storage.PendingAccountsManager;
 import org.whispersystems.textsecuregcm.storage.PendingDevices;
 import org.whispersystems.textsecuregcm.storage.PendingDevicesManager;
 import org.whispersystems.textsecuregcm.storage.PubSubManager;
-import org.whispersystems.textsecuregcm.storage.StoredMessages;
 import org.whispersystems.textsecuregcm.util.Constants;
 import org.whispersystems.textsecuregcm.util.UrlSigner;
-import org.whispersystems.textsecuregcm.websocket.ConnectListener;
+import org.whispersystems.textsecuregcm.websocket.AuthenticatedConnectListener;
+import org.whispersystems.textsecuregcm.websocket.DeadLetterHandler;
+import org.whispersystems.textsecuregcm.websocket.ProvisioningConnectListener;
 import org.whispersystems.textsecuregcm.websocket.WebSocketAccountAuthenticator;
 import org.whispersystems.textsecuregcm.workers.DirectoryCommand;
 import org.whispersystems.textsecuregcm.workers.VacuumCommand;
@@ -94,7 +102,6 @@ import io.dropwizard.client.JerseyClientBuilder;
 import io.dropwizard.db.DataSourceFactory;
 import io.dropwizard.jdbi.DBIFactory;
 import io.dropwizard.metrics.graphite.GraphiteReporterFactory;
-import io.dropwizard.migrations.MigrationsBundle;
 import io.dropwizard.setup.Bootstrap;
 import io.dropwizard.setup.Environment;
 import redis.clients.jedis.JedisPool;
@@ -109,12 +116,19 @@ public class WhisperServerService extends Application<WhisperServerConfiguration
   public void initialize(Bootstrap<WhisperServerConfiguration> bootstrap) {
     bootstrap.addCommand(new DirectoryCommand());
     bootstrap.addCommand(new VacuumCommand());
-    bootstrap.addBundle(new MigrationsBundle<WhisperServerConfiguration>() {
+    bootstrap.addBundle(new NameableMigrationsBundle<WhisperServerConfiguration>("accountdb", "accountsdb.xml") {
       @Override
       public DataSourceFactory getDataSourceFactory(WhisperServerConfiguration configuration) {
         return configuration.getDataSourceFactory();
       }
     });
+
+    bootstrap.addBundle(new NameableMigrationsBundle<WhisperServerConfiguration>("messagedb", "messagedb.xml") {
+      @Override
+      public DataSourceFactory getDataSourceFactory(WhisperServerConfiguration configuration) {
+        return configuration.getMessageStoreConfiguration();
+      }
+    });
   }
 
   @Override
@@ -130,72 +144,96 @@ public class WhisperServerService extends Application<WhisperServerConfiguration
     environment.getObjectMapper().configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
 
     DBIFactory dbiFactory = new DBIFactory();
-    DBI        jdbi       = dbiFactory.build(environment, config.getDataSourceFactory(), "postgresql");
+    DBI        database   = dbiFactory.build(environment, config.getDataSourceFactory(), "accountdb");
+    DBI        messagedb  = dbiFactory.build(environment, config.getMessageStoreConfiguration(), "messagedb");
 
-    Accounts        accounts        = jdbi.onDemand(Accounts.class);
-    PendingAccounts pendingAccounts = jdbi.onDemand(PendingAccounts.class);
-    PendingDevices  pendingDevices  = jdbi.onDemand(PendingDevices.class);
-    Keys            keys            = jdbi.onDemand(Keys.class);
+    Accounts        accounts        = database.onDemand(Accounts.class);
+    PendingAccounts pendingAccounts = database.onDemand(PendingAccounts.class);
+    PendingDevices  pendingDevices  = database.onDemand(PendingDevices.class);
+    Keys            keys            = database.onDemand(Keys.class);
+    Messages        messages        = messagedb.onDemand(Messages.class);
 
-    MemcachedClient memcachedClient = new MemcachedClientFactory(config.getMemcacheConfiguration()).getClient();
-    JedisPool       redisClient     = new RedisClientFactory(config.getRedisConfiguration()).getRedisClientPool();
-    Client          httpClient      = new JerseyClientBuilder(environment).using(config.getJerseyClientConfiguration())
-                                                                          .build(getName());
+    RedisClientFactory cacheClientFactory = new RedisClientFactory(config.getCacheConfiguration().getUrl());
+    JedisPool          cacheClient        = cacheClientFactory.getRedisClientPool();
+    JedisPool          directoryClient    = new RedisClientFactory(config.getDirectoryConfiguration().getUrl()).getRedisClientPool();
+    Client             httpClient         = new JerseyClientBuilder(environment).using(config.getJerseyClientConfiguration())
+                                                                                .build(getName());
 
-    DirectoryManager       directory              = new DirectoryManager(redisClient);
-    PendingAccountsManager pendingAccountsManager = new PendingAccountsManager(pendingAccounts, memcachedClient);
-    PendingDevicesManager  pendingDevicesManager  = new PendingDevicesManager (pendingDevices, memcachedClient );
-    AccountsManager        accountsManager        = new AccountsManager(accounts, directory, memcachedClient);
+    DirectoryManager       directory              = new DirectoryManager(directoryClient);
+    PendingAccountsManager pendingAccountsManager = new PendingAccountsManager(pendingAccounts, cacheClient);
+    PendingDevicesManager  pendingDevicesManager  = new PendingDevicesManager (pendingDevices, cacheClient);
+    AccountsManager        accountsManager        = new AccountsManager(accounts, directory, cacheClient);
     FederatedClientManager federatedClientManager = new FederatedClientManager(config.getFederationConfiguration());
-    StoredMessages         storedMessages         = new StoredMessages(redisClient);
-    PubSubManager          pubSubManager          = new PubSubManager(redisClient);
+    MessagesManager        messagesManager        = new MessagesManager(messages);
+    DeadLetterHandler      deadLetterHandler      = new DeadLetterHandler(messagesManager);
+    DispatchManager        dispatchManager        = new DispatchManager(cacheClientFactory, Optional.<DispatchChannel>of(deadLetterHandler));
+    PubSubManager          pubSubManager          = new PubSubManager(cacheClient, dispatchManager);
     PushServiceClient      pushServiceClient      = new PushServiceClient(httpClient, config.getPushConfiguration());
-    WebsocketSender        websocketSender        = new WebsocketSender(storedMessages, pubSubManager);
+    WebsocketSender        websocketSender        = new WebsocketSender(messagesManager, pubSubManager);
     AccountAuthenticator   deviceAuthenticator    = new AccountAuthenticator(accountsManager);
-    RateLimiters           rateLimiters           = new RateLimiters(config.getLimitsConfiguration(), memcachedClient);
+    RateLimiters           rateLimiters           = new RateLimiters(config.getLimitsConfiguration(), cacheClient);
 
+    ApnFallbackManager       apnFallbackManager  = new ApnFallbackManager(pushServiceClient);
     TwilioSmsSender          twilioSmsSender     = new TwilioSmsSender(config.getTwilioConfiguration());
     Optional<NexmoSmsSender> nexmoSmsSender      = initializeNexmoSmsSender(config.getNexmoConfiguration());
     SmsSender                smsSender           = new SmsSender(twilioSmsSender, nexmoSmsSender, config.getTwilioConfiguration().isInternational());
     UrlSigner                urlSigner           = new UrlSigner(config.getS3Configuration());
-    PushSender               pushSender          = new PushSender(pushServiceClient, websocketSender);
+    PushSender               pushSender          = new PushSender(apnFallbackManager, pushServiceClient, websocketSender);
+    ReceiptSender            receiptSender       = new ReceiptSender(accountsManager, pushSender, federatedClientManager);
     FeedbackHandler          feedbackHandler     = new FeedbackHandler(pushServiceClient, accountsManager);
     Optional<byte[]>         authorizationKey    = config.getRedphoneConfiguration().getAuthorizationKey();
 
+    environment.lifecycle().manage(apnFallbackManager);
+    environment.lifecycle().manage(pubSubManager);
     environment.lifecycle().manage(feedbackHandler);
 
     AttachmentController attachmentController = new AttachmentController(rateLimiters, federatedClientManager, urlSigner);
     KeysControllerV1     keysControllerV1     = new KeysControllerV1(rateLimiters, keys, accountsManager, federatedClientManager);
     KeysControllerV2     keysControllerV2     = new KeysControllerV2(rateLimiters, keys, accountsManager, federatedClientManager);
-    MessageController    messageController    = new MessageController(rateLimiters, pushSender, accountsManager, federatedClientManager);
+    MessageController    messageController    = new MessageController(rateLimiters, pushSender, receiptSender, accountsManager, messagesManager, federatedClientManager);
 
     environment.jersey().register(new MultiBasicAuthProvider<>(new FederatedPeerAuthenticator(config.getFederationConfiguration()),
                                                                FederatedPeer.class,
                                                                deviceAuthenticator,
                                                                Device.class, "WhisperServer"));
 
-    environment.jersey().register(new AccountController(pendingAccountsManager, accountsManager, rateLimiters, smsSender, storedMessages, new TimeProvider(), authorizationKey));
+    environment.jersey().register(new AccountController(pendingAccountsManager, accountsManager, rateLimiters, smsSender, messagesManager, new TimeProvider(), authorizationKey, config.getTestDevices()));
     environment.jersey().register(new DeviceController(pendingDevicesManager, accountsManager, rateLimiters));
     environment.jersey().register(new DirectoryController(rateLimiters, directory));
     environment.jersey().register(new FederationControllerV1(accountsManager, attachmentController, messageController, keysControllerV1));
     environment.jersey().register(new FederationControllerV2(accountsManager, attachmentController, messageController, keysControllerV2));
-    environment.jersey().register(new ReceiptController(accountsManager, federatedClientManager, pushSender));
+    environment.jersey().register(new ReceiptController(receiptSender));
+    environment.jersey().register(new ProvisioningController(rateLimiters, pushSender));
     environment.jersey().register(attachmentController);
     environment.jersey().register(keysControllerV1);
     environment.jersey().register(keysControllerV2);
     environment.jersey().register(messageController);
 
     if (config.getWebsocketConfiguration().isEnabled()) {
-      WebSocketEnvironment webSocketEnvironment = new WebSocketEnvironment(environment);
+      WebSocketEnvironment webSocketEnvironment = new WebSocketEnvironment(environment, config, 90000);
       webSocketEnvironment.setAuthenticator(new WebSocketAccountAuthenticator(deviceAuthenticator));
-      webSocketEnvironment.setConnectListener(new ConnectListener(accountsManager, pushSender, storedMessages, pubSubManager));
+      webSocketEnvironment.setConnectListener(new AuthenticatedConnectListener(accountsManager, pushSender, receiptSender, messagesManager, pubSubManager, apnFallbackManager));
+      webSocketEnvironment.jersey().register(new KeepAliveController(pubSubManager));
 
-      WebSocketResourceProviderFactory servlet = new WebSocketResourceProviderFactory(webSocketEnvironment);
+      WebSocketEnvironment provisioningEnvironment = new WebSocketEnvironment(environment, config);
+      provisioningEnvironment.setConnectListener(new ProvisioningConnectListener(pubSubManager));
+      provisioningEnvironment.jersey().register(new KeepAliveController(pubSubManager));
+      
+      WebSocketResourceProviderFactory webSocketServlet    = new WebSocketResourceProviderFactory(webSocketEnvironment   );
+      WebSocketResourceProviderFactory provisioningServlet = new WebSocketResourceProviderFactory(provisioningEnvironment);
 
-      ServletRegistration.Dynamic websocket = environment.servlets().addServlet("WebSocket", servlet);
-      websocket.addMapping("/v1/websocket/*");
+      ServletRegistration.Dynamic websocket    = environment.servlets().addServlet("WebSocket", webSocketServlet      );
+      ServletRegistration.Dynamic provisioning = environment.servlets().addServlet("Provisioning", provisioningServlet);
+
+      websocket.addMapping("/v1/websocket/");
       websocket.setAsyncSupported(true);
 
+      provisioning.addMapping("/v1/websocket/provisioning/");
+      provisioning.setAsyncSupported(true);
+
+      webSocketServlet.start();
+      provisioningServlet.start();
+
       FilterRegistration.Dynamic filter = environment.servlets().addFilter("CORS", CrossOriginFilter.class);
       filter.addMappingForUrlPatterns(EnumSet.allOf(DispatcherType.class), true, "/*");
       filter.setInitParameter("allowedOrigins", "*");
@@ -205,11 +243,13 @@ public class WhisperServerService extends Application<WhisperServerConfiguration
       filter.setInitParameter("allowCredentials", "true");
     }
 
-    environment.healthChecks().register("redis", new RedisHealthCheck(redisClient));
-    environment.healthChecks().register("memcache", new MemcacheHealthCheck(memcachedClient));
+    environment.healthChecks().register("directory", new RedisHealthCheck(directoryClient));
+    environment.healthChecks().register("cache", new RedisHealthCheck(cacheClient));
 
     environment.jersey().register(new IOExceptionMapper());
     environment.jersey().register(new RateLimitExceededExceptionMapper());
+    environment.jersey().register(new InvalidWebsocketAddressExceptionMapper());
+    environment.jersey().register(new DeviceLimitExceededExceptionMapper());
 
     environment.metrics().register(name(CpuUsageGauge.class, "cpu"), new CpuUsageGauge());
     environment.metrics().register(name(FreeMemoryGauge.class, "free_memory"), new FreeMemoryGauge());
@@ -224,13 +264,6 @@ public class WhisperServerService extends Application<WhisperServerConfiguration
       GraphiteReporter graphiteReporter = (GraphiteReporter) graphiteReporterFactory.build(environment.metrics());
       graphiteReporter.start(15, TimeUnit.SECONDS);
     }
-
-    if (config.getMetricsConfiguration().isEnabled()) {
-      new JsonMetricsReporter(environment.metrics(),
-                              config.getMetricsConfiguration().getToken(),
-                              config.getMetricsConfiguration().getHost())
-          .start(60, TimeUnit.SECONDS);
-    }
   }
 
   private Optional<NexmoSmsSender> initializeNexmoSmsSender(NexmoConfiguration configuration) {
@@ -244,5 +277,4 @@ public class WhisperServerService extends Application<WhisperServerConfiguration
   public static void main(String[] args) throws Exception {
     new WhisperServerService().run(args);
   }
-
 }

src/main/java/org/whispersystems/textsecuregcm/configuration/FederationConfiguration.java

@@ -18,12 +18,8 @@ package org.whispersystems.textsecuregcm.configuration;
 
 
 import com.fasterxml.jackson.annotation.JsonProperty;
-import com.google.gson.JsonArray;
-import com.google.gson.JsonElement;
-import com.google.gson.JsonParser;
 import org.whispersystems.textsecuregcm.federation.FederatedPeer;
 
-import java.util.LinkedList;
 import java.util.List;
 
 public class FederationConfiguration {
@@ -34,31 +30,7 @@ public class FederationConfiguration {
   @JsonProperty
   private String name;
 
-  @JsonProperty
-  private String herokuPeers;
-
   public List<FederatedPeer> getPeers() {
-    if (peers != null) {
-      return peers;
-    }
-
-    if (herokuPeers != null) {
-      List<FederatedPeer> peers        = new LinkedList<>();
-      JsonElement         root         = new JsonParser().parse(herokuPeers);
-      JsonArray           peerElements = root.getAsJsonArray();
-
-      for (JsonElement peer : peerElements) {
-        String name                = peer.getAsJsonObject().get("name").getAsString();
-        String url                 = peer.getAsJsonObject().get("url").getAsString();
-        String authenticationToken = peer.getAsJsonObject().get("authenticationToken").getAsString();
-        String certificate         = peer.getAsJsonObject().get("certificate").getAsString();
-
-        peers.add(new FederatedPeer(name, url, authenticationToken, certificate));
-      }
-
-      return peers;
-    }
-
     return peers;
   }
 

src/main/java/org/whispersystems/textsecuregcm/configuration/MessageStoreConfiguration.java

@@ -0,0 +1,14 @@
+package org.whispersystems.textsecuregcm.configuration;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import org.hibernate.validator.constraints.NotEmpty;
+
+public class MessageStoreConfiguration {
+  @JsonProperty
+  @NotEmpty
+  private String url;
+
+  public String getUrl() {
+    return url;
+  }
+}

src/main/java/org/whispersystems/textsecuregcm/configuration/MetricsConfiguration.java

@@ -1,27 +0,0 @@
-package org.whispersystems.textsecuregcm.configuration;
-
-import com.fasterxml.jackson.annotation.JsonProperty;
-
-public class MetricsConfiguration {
-
-  @JsonProperty
-  private String token;
-
-  @JsonProperty
-  private String host;
-
-  @JsonProperty
-  private boolean enabled = false;
-
-  public String getHost() {
-    return host;
-  }
-
-  public String getToken() {
-    return token;
-  }
-
-  public boolean isEnabled() {
-    return enabled && token != null && host != null;
-  }
-}

src/main/java/org/whispersystems/textsecuregcm/configuration/TestDeviceConfiguration.java

@@ -0,0 +1,25 @@
+package org.whispersystems.textsecuregcm.configuration;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import org.hibernate.validator.constraints.NotEmpty;
+
+import javax.validation.constraints.NotNull;
+
+public class TestDeviceConfiguration {
+
+  @JsonProperty
+  @NotEmpty
+  private String number;
+
+  @JsonProperty
+  @NotNull
+  private int code;
+
+  public String getNumber() {
+    return number;
+  }
+
+  public int getCode() {
+    return code;
+  }
+}

src/main/java/org/whispersystems/textsecuregcm/controllers/AccountController.java

@@ -23,11 +23,11 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.whispersystems.textsecuregcm.auth.AuthenticationCredentials;
 import org.whispersystems.textsecuregcm.auth.AuthorizationHeader;
+import org.whispersystems.textsecuregcm.auth.AuthorizationToken;
 import org.whispersystems.textsecuregcm.auth.InvalidAuthorizationHeaderException;
 import org.whispersystems.textsecuregcm.entities.AccountAttributes;
 import org.whispersystems.textsecuregcm.entities.ApnRegistrationId;
 import org.whispersystems.textsecuregcm.entities.GcmRegistrationId;
-import org.whispersystems.textsecuregcm.auth.AuthorizationToken;
 import org.whispersystems.textsecuregcm.limits.RateLimiters;
 import org.whispersystems.textsecuregcm.providers.TimeProvider;
 import org.whispersystems.textsecuregcm.sms.SmsSender;
@@ -35,11 +35,10 @@ import org.whispersystems.textsecuregcm.sms.TwilioSmsSender;
 import org.whispersystems.textsecuregcm.storage.Account;
 import org.whispersystems.textsecuregcm.storage.AccountsManager;
 import org.whispersystems.textsecuregcm.storage.Device;
+import org.whispersystems.textsecuregcm.storage.MessagesManager;
 import org.whispersystems.textsecuregcm.storage.PendingAccountsManager;
-import org.whispersystems.textsecuregcm.storage.StoredMessages;
 import org.whispersystems.textsecuregcm.util.Util;
 import org.whispersystems.textsecuregcm.util.VerificationCode;
-import org.whispersystems.textsecuregcm.websocket.WebsocketAddress;
 
 import javax.validation.Valid;
 import javax.ws.rs.Consumes;
@@ -57,6 +56,7 @@ import javax.ws.rs.core.Response;
 import java.io.IOException;
 import java.security.NoSuchAlgorithmException;
 import java.security.SecureRandom;
+import java.util.Map;
 
 import io.dropwizard.auth.Auth;
 
@@ -69,25 +69,28 @@ public class AccountController {
   private final AccountsManager        accounts;
   private final RateLimiters           rateLimiters;
   private final SmsSender              smsSender;
-  private final StoredMessages         storedMessages;
+  private final MessagesManager        messagesManager;
   private final TimeProvider           timeProvider;
   private final Optional<byte[]>       authorizationKey;
+  private final Map<String, Integer>   testDevices;
 
   public AccountController(PendingAccountsManager pendingAccounts,
                            AccountsManager accounts,
                            RateLimiters rateLimiters,
                            SmsSender smsSenderFactory,
-                           StoredMessages storedMessages,
+                           MessagesManager messagesManager,
                            TimeProvider timeProvider,
-                           Optional<byte[]> authorizationKey)
+                           Optional<byte[]> authorizationKey,
+                           Map<String, Integer> testDevices)
   {
     this.pendingAccounts  = pendingAccounts;
     this.accounts         = accounts;
     this.rateLimiters     = rateLimiters;
     this.smsSender        = smsSenderFactory;
-    this.storedMessages   = storedMessages;
+    this.messagesManager  = messagesManager;
     this.timeProvider     = timeProvider;
     this.authorizationKey = authorizationKey;
+    this.testDevices      = testDevices;
   }
 
   @Timed
@@ -113,10 +116,12 @@ public class AccountController {
         throw new WebApplicationException(Response.status(422).build());
     }
 
-    VerificationCode verificationCode = generateVerificationCode();
+    VerificationCode verificationCode = generateVerificationCode(number);
     pendingAccounts.store(number, verificationCode.getVerificationCode());
 
-    if (transport.equals("sms")) {
+    if (testDevices.containsKey(number)) {
+      // noop
+    } else if (transport.equals("sms")) {
       smsSender.deliverSmsVerification(number, verificationCode.getVerificationCodeDisplay());
     } else if (transport.equals("voice")) {
       smsSender.deliverVoxVerification(number, verificationCode.getVerificationCodeSpeech());
@@ -198,10 +203,15 @@ public class AccountController {
   @PUT
   @Path("/gcm/")
   @Consumes(MediaType.APPLICATION_JSON)
-  public void setGcmRegistrationId(@Auth Account account, @Valid GcmRegistrationId registrationId)  {
+  public void setGcmRegistrationId(@Auth Account account, @Valid GcmRegistrationId registrationId) {
     Device device = account.getAuthenticatedDevice().get();
     device.setApnId(null);
+    device.setVoipApnId(null);
     device.setGcmId(registrationId.getGcmRegistrationId());
+
+    if (registrationId.isWebSocketChannel()) device.setFetchesMessages(true);
+    else                                     device.setFetchesMessages(false);
+
     accounts.update(account);
   }
 
@@ -211,6 +221,7 @@ public class AccountController {
   public void deleteGcmRegistrationId(@Auth Account account) {
     Device device = account.getAuthenticatedDevice().get();
     device.setGcmId(null);
+    device.setFetchesMessages(false);
     accounts.update(account);
   }
 
@@ -221,7 +232,9 @@ public class AccountController {
   public void setApnRegistrationId(@Auth Account account, @Valid ApnRegistrationId registrationId) {
     Device device = account.getAuthenticatedDevice().get();
     device.setApnId(registrationId.getApnRegistrationId());
+    device.setVoipApnId(registrationId.getVoipRegistrationId());
     device.setGcmId(null);
+    device.setFetchesMessages(true);
     accounts.update(account);
   }
 
@@ -231,6 +244,25 @@ public class AccountController {
   public void deleteApnRegistrationId(@Auth Account account) {
     Device device = account.getAuthenticatedDevice().get();
     device.setApnId(null);
+    device.setFetchesMessages(false);
+    accounts.update(account);
+  }
+
+  @Timed
+  @PUT
+  @Path("/wsc/")
+  public void setWebSocketChannelSupported(@Auth Account account) {
+    Device device = account.getAuthenticatedDevice().get();
+    device.setFetchesMessages(true);
+    accounts.update(account);
+  }
+
+  @Timed
+  @DELETE
+  @Path("/wsc/")
+  public void deleteWebSocketChannel(@Auth Account account) {
+    Device device = account.getAuthenticatedDevice().get();
+    device.setFetchesMessages(false);
     accounts.update(account);
   }
 
@@ -250,21 +282,27 @@ public class AccountController {
     device.setSignalingKey(accountAttributes.getSignalingKey());
     device.setFetchesMessages(accountAttributes.getFetchesMessages());
     device.setRegistrationId(accountAttributes.getRegistrationId());
+    device.setName(accountAttributes.getName());
+    device.setCreated(System.currentTimeMillis());
+    device.setLastSeen(Util.todayInMillis());
 
     Account account = new Account();
     account.setNumber(number);
-    account.setSupportsSms(accountAttributes.getSupportsSms());
     account.addDevice(device);
 
     accounts.create(account);
-    storedMessages.clear(new WebsocketAddress(number, Device.MASTER_ID));
+    messagesManager.clear(number);
     pendingAccounts.remove(number);
 
     logger.debug("Stored device...");
   }
 
-  @VisibleForTesting protected VerificationCode generateVerificationCode() {
+  @VisibleForTesting protected VerificationCode generateVerificationCode(String number) {
     try {
+      if (testDevices.containsKey(number)) {
+        return new VerificationCode(testDevices.get(number));
+      }
+
       SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
       int randomInt       = 100000 + random.nextInt(900000);
       return new VerificationCode(randomInt);

src/main/java/org/whispersystems/textsecuregcm/controllers/DeviceController.java

@@ -25,16 +25,20 @@ import org.whispersystems.textsecuregcm.auth.AuthenticationCredentials;
 import org.whispersystems.textsecuregcm.auth.AuthorizationHeader;
 import org.whispersystems.textsecuregcm.auth.InvalidAuthorizationHeaderException;
 import org.whispersystems.textsecuregcm.entities.AccountAttributes;
+import org.whispersystems.textsecuregcm.entities.DeviceInfo;
+import org.whispersystems.textsecuregcm.entities.DeviceInfoList;
 import org.whispersystems.textsecuregcm.entities.DeviceResponse;
 import org.whispersystems.textsecuregcm.limits.RateLimiters;
 import org.whispersystems.textsecuregcm.storage.Account;
 import org.whispersystems.textsecuregcm.storage.AccountsManager;
 import org.whispersystems.textsecuregcm.storage.Device;
 import org.whispersystems.textsecuregcm.storage.PendingDevicesManager;
+import org.whispersystems.textsecuregcm.util.Util;
 import org.whispersystems.textsecuregcm.util.VerificationCode;
 
 import javax.validation.Valid;
 import javax.ws.rs.Consumes;
+import javax.ws.rs.DELETE;
 import javax.ws.rs.GET;
 import javax.ws.rs.HeaderParam;
 import javax.ws.rs.PUT;
@@ -44,8 +48,11 @@ import javax.ws.rs.Produces;
 import javax.ws.rs.WebApplicationException;
 import javax.ws.rs.core.MediaType;
 import javax.ws.rs.core.Response;
+import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
 import java.security.SecureRandom;
+import java.util.LinkedList;
+import java.util.List;
 
 import io.dropwizard.auth.Auth;
 
@@ -54,6 +61,8 @@ public class DeviceController {
 
   private final Logger logger = LoggerFactory.getLogger(DeviceController.class);
 
+  private static final int MAX_DEVICES = 3;
+
   private final PendingDevicesManager pendingDevices;
   private final AccountsManager       accounts;
   private final RateLimiters          rateLimiters;
@@ -69,13 +78,47 @@ public class DeviceController {
 
   @Timed
   @GET
-  @Path("/provisioning_code")
+  @Produces(MediaType.APPLICATION_JSON)
+  public DeviceInfoList getDevices(@Auth Account account) {
+    List<DeviceInfo> devices = new LinkedList<>();
+
+    for (Device device : account.getDevices()) {
+      devices.add(new DeviceInfo(device.getId(), device.getName(),
+                                 device.getLastSeen(), device.getCreated()));
+    }
+
+    return new DeviceInfoList(devices);
+  }
+
+  @Timed
+  @DELETE
+  @Path("/{device_id}")
+  public void removeDevice(@Auth Account account, @PathParam("device_id") long deviceId) {
+    if (account.getAuthenticatedDevice().get().getId() != Device.MASTER_ID) {
+      throw new WebApplicationException(Response.Status.UNAUTHORIZED);
+    }
+
+    account.removeDevice(deviceId);
+    accounts.update(account);
+  }
+
+  @Timed
+  @GET
+  @Path("/provisioning/code")
   @Produces(MediaType.APPLICATION_JSON)
   public VerificationCode createDeviceToken(@Auth Account account)
-      throws RateLimitExceededException
+      throws RateLimitExceededException, DeviceLimitExceededException
   {
     rateLimiters.getAllocateDeviceLimiter().validate(account.getNumber());
 
+    if (account.getActiveDeviceCount() >= MAX_DEVICES) {
+      throw new DeviceLimitExceededException(account.getDevices().size(), MAX_DEVICES);
+    }
+
+    if (account.getAuthenticatedDevice().get().getId() != Device.MASTER_ID) {
+      throw new WebApplicationException(Response.Status.UNAUTHORIZED);
+    }
+
     VerificationCode verificationCode = generateVerificationCode();
     pendingDevices.store(account.getNumber(), verificationCode.getVerificationCode());
 
@@ -90,7 +133,7 @@ public class DeviceController {
   public DeviceResponse verifyDeviceToken(@PathParam("verification_code") String verificationCode,
                                           @HeaderParam("Authorization")   String authorizationHeader,
                                           @Valid                          AccountAttributes accountAttributes)
-      throws RateLimitExceededException
+      throws RateLimitExceededException, DeviceLimitExceededException
   {
     try {
       AuthorizationHeader header = AuthorizationHeader.fromFullHeader(authorizationHeader);
@@ -102,7 +145,7 @@ public class DeviceController {
       Optional<String> storedVerificationCode = pendingDevices.getCodeForNumber(number);
 
       if (!storedVerificationCode.isPresent() ||
-          !verificationCode.equals(storedVerificationCode.get()))
+          !MessageDigest.isEqual(verificationCode.getBytes(), storedVerificationCode.get().getBytes()))
       {
         throw new WebApplicationException(Response.status(403).build());
       }
@@ -113,11 +156,19 @@ public class DeviceController {
         throw new WebApplicationException(Response.status(403).build());
       }
 
+      if (account.get().getActiveDeviceCount() >= MAX_DEVICES) {
+        throw new DeviceLimitExceededException(account.get().getDevices().size(), MAX_DEVICES);
+      }
+
       Device device = new Device();
+      device.setName(accountAttributes.getName());
       device.setAuthenticationCredentials(new AuthenticationCredentials(password));
       device.setSignalingKey(accountAttributes.getSignalingKey());
       device.setFetchesMessages(accountAttributes.getFetchesMessages());
       device.setId(account.get().getNextDeviceId());
+      device.setRegistrationId(accountAttributes.getRegistrationId());
+      device.setLastSeen(Util.todayInMillis());
+      device.setCreated(System.currentTimeMillis());
 
       account.get().addDevice(device);
       accounts.update(account.get());

src/main/java/org/whispersystems/textsecuregcm/controllers/DeviceLimitExceededException.java

@@ -0,0 +1,21 @@
+package org.whispersystems.textsecuregcm.controllers;
+
+
+public class DeviceLimitExceededException extends Exception {
+
+  private final int currentDevices;
+  private final int maxDevices;
+
+  public DeviceLimitExceededException(int currentDevices, int maxDevices) {
+    this.currentDevices = currentDevices;
+    this.maxDevices     = maxDevices;
+  }
+
+  public int getCurrentDevices() {
+    return currentDevices;
+  }
+
+  public int getMaxDevices() {
+    return maxDevices;
+  }
+}

src/main/java/org/whispersystems/textsecuregcm/controllers/DirectoryController.java

@@ -74,7 +74,7 @@ public class DirectoryController {
     rateLimiters.getContactsLimiter().validate(account.getNumber());
 
     try {
-      Optional<ClientContact> contact = directory.get(Base64.decodeWithoutPadding(token));
+      Optional<ClientContact> contact = directory.get(decodeToken(token));
 
       if (contact.isPresent()) return Response.ok().entity(contact.get()).build();
       else                     return Response.status(404).build();
@@ -100,7 +100,7 @@ public class DirectoryController {
       List<byte[]> tokens = new LinkedList<>();
 
       for (String encodedContact : contacts.getContacts()) {
-        tokens.add(Base64.decodeWithoutPadding(encodedContact));
+        tokens.add(decodeToken(encodedContact));
       }
 
       List<ClientContact> intersection = directory.get(tokens);
@@ -110,4 +110,8 @@ public class DirectoryController {
       throw new WebApplicationException(Response.status(400).build());
     }
   }
+
+  private byte[] decodeToken(String encoded) throws IOException {
+    return Base64.decodeWithoutPadding(encoded.replace('-', '+').replace('_', '/'));
+  }
 }

src/main/java/org/whispersystems/textsecuregcm/controllers/FederationControllerV1.java

@@ -150,7 +150,7 @@ public class FederationControllerV1 extends FederationController {
 
     for (Account account : accountList) {
       byte[]        token         = Util.getContactToken(account.getNumber());
-      ClientContact clientContact = new ClientContact(token, null, account.getSupportsSms());
+      ClientContact clientContact = new ClientContact(token, null);
 
       if (!account.isActive()) {
         clientContact.setInactive(true);

src/main/java/org/whispersystems/textsecuregcm/controllers/InvalidDestinationException.java

@@ -0,0 +1,7 @@
+package org.whispersystems.textsecuregcm.controllers;
+
+public class InvalidDestinationException extends Exception {
+  public InvalidDestinationException(String message) {
+    super(message);
+  }
+}

src/main/java/org/whispersystems/textsecuregcm/controllers/KeepAliveController.java

@@ -0,0 +1,48 @@
+package org.whispersystems.textsecuregcm.controllers;
+
+import com.codahale.metrics.annotation.Timed;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.whispersystems.textsecuregcm.storage.Account;
+import org.whispersystems.textsecuregcm.storage.PubSubManager;
+import org.whispersystems.textsecuregcm.websocket.WebsocketAddress;
+import org.whispersystems.websocket.session.WebSocketSession;
+import org.whispersystems.websocket.session.WebSocketSessionContext;
+
+import javax.ws.rs.GET;
+import javax.ws.rs.Path;
+import javax.ws.rs.core.Response;
+
+import io.dropwizard.auth.Auth;
+
+
+@Path("/v1/keepalive")
+public class KeepAliveController {
+
+  private final Logger logger = LoggerFactory.getLogger(KeepAliveController.class);
+
+  private final PubSubManager pubSubManager;
+
+  public KeepAliveController(PubSubManager pubSubManager) {
+    this.pubSubManager = pubSubManager;
+  }
+
+  @Timed
+  @GET
+  public Response getKeepAlive(@Auth(required = false) Account account,
+                               @WebSocketSession       WebSocketSessionContext context)
+  {
+    if (account != null) {
+      WebsocketAddress address = new WebsocketAddress(account.getNumber(),
+                                                      account.getAuthenticatedDevice().get().getId());
+
+      if (!pubSubManager.hasLocalSubscription(address)) {
+        logger.warn("***** No local subscription found for: " + address);
+        context.getClient().close(1000, "OK");
+      }
+    }
+
+    return Response.ok().build();
+  }
+
+}

src/main/java/org/whispersystems/textsecuregcm/controllers/MessageController.java

@@ -23,9 +23,12 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.whispersystems.textsecuregcm.entities.IncomingMessage;
 import org.whispersystems.textsecuregcm.entities.IncomingMessageList;
-import org.whispersystems.textsecuregcm.entities.MessageProtos.OutgoingMessageSignal;
+import org.whispersystems.textsecuregcm.entities.MessageProtos.Envelope;
 import org.whispersystems.textsecuregcm.entities.MessageResponse;
 import org.whispersystems.textsecuregcm.entities.MismatchedDevices;
+import org.whispersystems.textsecuregcm.entities.OutgoingMessageEntity;
+import org.whispersystems.textsecuregcm.entities.OutgoingMessageEntityList;
+import org.whispersystems.textsecuregcm.entities.SendMessageResponse;
 import org.whispersystems.textsecuregcm.entities.StaleDevices;
 import org.whispersystems.textsecuregcm.federation.FederatedClient;
 import org.whispersystems.textsecuregcm.federation.FederatedClientManager;
@@ -33,14 +36,19 @@ import org.whispersystems.textsecuregcm.federation.NoSuchPeerException;
 import org.whispersystems.textsecuregcm.limits.RateLimiters;
 import org.whispersystems.textsecuregcm.push.NotPushRegisteredException;
 import org.whispersystems.textsecuregcm.push.PushSender;
+import org.whispersystems.textsecuregcm.push.ReceiptSender;
 import org.whispersystems.textsecuregcm.push.TransientPushFailureException;
 import org.whispersystems.textsecuregcm.storage.Account;
 import org.whispersystems.textsecuregcm.storage.AccountsManager;
 import org.whispersystems.textsecuregcm.storage.Device;
+import org.whispersystems.textsecuregcm.storage.MessagesManager;
 import org.whispersystems.textsecuregcm.util.Base64;
+import org.whispersystems.textsecuregcm.util.Util;
 
 import javax.validation.Valid;
 import javax.ws.rs.Consumes;
+import javax.ws.rs.DELETE;
+import javax.ws.rs.GET;
 import javax.ws.rs.POST;
 import javax.ws.rs.PUT;
 import javax.ws.rs.Path;
@@ -64,17 +72,23 @@ public class MessageController {
 
   private final RateLimiters           rateLimiters;
   private final PushSender             pushSender;
+  private final ReceiptSender          receiptSender;
   private final FederatedClientManager federatedClientManager;
   private final AccountsManager        accountsManager;
+  private final MessagesManager        messagesManager;
 
   public MessageController(RateLimiters rateLimiters,
                            PushSender pushSender,
+                           ReceiptSender receiptSender,
                            AccountsManager accountsManager,
+                           MessagesManager messagesManager,
                            FederatedClientManager federatedClientManager)
   {
     this.rateLimiters           = rateLimiters;
     this.pushSender             = pushSender;
+    this.receiptSender          = receiptSender;
     this.accountsManager        = accountsManager;
+    this.messagesManager        = messagesManager;
     this.federatedClientManager = federatedClientManager;
   }
 
@@ -82,16 +96,21 @@ public class MessageController {
   @Path("/{destination}")
   @PUT
   @Consumes(MediaType.APPLICATION_JSON)
-  public void sendMessage(@Auth                     Account source,
-                          @PathParam("destination") String destinationName,
-                          @Valid                    IncomingMessageList messages)
+  @Produces(MediaType.APPLICATION_JSON)
+  public SendMessageResponse sendMessage(@Auth                     Account source,
+                                         @PathParam("destination") String destinationName,
+                                         @Valid                    IncomingMessageList messages)
       throws IOException, RateLimitExceededException
   {
-    rateLimiters.getMessagesLimiter().validate(source.getNumber());
+    rateLimiters.getMessagesLimiter().validate(source.getNumber() + "__" + destinationName);
 
     try {
-      if (messages.getRelay() == null) sendLocalMessage(source, destinationName, messages);
-      else                             sendRelayMessage(source, destinationName, messages);
+      boolean isSyncMessage = source.getNumber().equals(destinationName);
+
+      if (Util.isEmpty(messages.getRelay())) sendLocalMessage(source, destinationName, messages, isSyncMessage);
+      else                                   sendRelayMessage(source, destinationName, messages, isSyncMessage);
+
+      return new SendMessageResponse(!isSyncMessage && source.getActiveDeviceCount() > 1);
     } catch (NoSuchUserException e) {
       throw new WebApplicationException(Response.status(404).build());
     } catch (MismatchedDevicesException e) {
@@ -105,6 +124,8 @@ public class MessageController {
                                                 .type(MediaType.APPLICATION_JSON)
                                                 .entity(new StaleDevices(e.getStaleDevices()))
                                                 .build());
+    } catch (InvalidDestinationException e) {
+      throw new WebApplicationException(Response.status(400).build());
     }
   }
 
@@ -128,14 +149,50 @@ public class MessageController {
     }
   }
 
+  @Timed
+  @GET
+  @Produces(MediaType.APPLICATION_JSON)
+  public OutgoingMessageEntityList getPendingMessages(@Auth Account account) {
+    return new OutgoingMessageEntityList(messagesManager.getMessagesForDevice(account.getNumber(),
+                                                                              account.getAuthenticatedDevice()
+                                                                                     .get().getId()));
+  }
+
+  @Timed
+  @DELETE
+  @Path("/{source}/{timestamp}")
+  public void removePendingMessage(@Auth Account account,
+                                   @PathParam("source") String source,
+                                   @PathParam("timestamp") long timestamp)
+      throws IOException
+  {
+    try {
+      Optional<OutgoingMessageEntity> message = messagesManager.delete(account.getNumber(), source, timestamp);
+
+      if (message.isPresent() && message.get().getType() != Envelope.Type.RECEIPT_VALUE) {
+        receiptSender.sendReceipt(account,
+                                  message.get().getSource(),
+                                  message.get().getTimestamp(),
+                                  Optional.fromNullable(message.get().getRelay()));
+      }
+    } catch (NoSuchUserException | NotPushRegisteredException | TransientPushFailureException e) {
+      logger.warn("Sending delivery receipt", e);
+    }
+  }
+
+
   private void sendLocalMessage(Account source,
                                 String destinationName,
-                                IncomingMessageList messages)
+                                IncomingMessageList messages,
+                                boolean isSyncMessage)
       throws NoSuchUserException, MismatchedDevicesException, IOException, StaleDevicesException
   {
-    Account destination = getDestinationAccount(destinationName);
+    Account destination;
 
-    validateCompleteDeviceList(destination, messages.getMessages());
+    if (!isSyncMessage) destination = getDestinationAccount(destinationName);
+    else                destination = source;
+
+    validateCompleteDeviceList(destination, messages.getMessages(), isSyncMessage);
     validateRegistrationIds(destination, messages.getMessages());
 
     for (IncomingMessage incomingMessage : messages.getMessages()) {
@@ -155,16 +212,21 @@ public class MessageController {
       throws NoSuchUserException, IOException
   {
     try {
-      Optional<byte[]>              messageBody    = getMessageBody(incomingMessage);
-      OutgoingMessageSignal.Builder messageBuilder = OutgoingMessageSignal.newBuilder();
+      Optional<byte[]> messageBody    = getMessageBody(incomingMessage);
+      Optional<byte[]> messageContent = getMessageContent(incomingMessage);
+      Envelope.Builder messageBuilder = Envelope.newBuilder();
 
-      messageBuilder.setType(incomingMessage.getType())
+      messageBuilder.setType(Envelope.Type.valueOf(incomingMessage.getType()))
                     .setSource(source.getNumber())
                     .setTimestamp(timestamp == 0 ? System.currentTimeMillis() : timestamp)
-                    .setSourceDevice((int)source.getAuthenticatedDevice().get().getId());
+                    .setSourceDevice((int) source.getAuthenticatedDevice().get().getId());
 
       if (messageBody.isPresent()) {
-        messageBuilder.setMessage(ByteString.copyFrom(messageBody.get()));
+        messageBuilder.setLegacyMessage(ByteString.copyFrom(messageBody.get()));
+      }
+
+      if (messageContent.isPresent()) {
+        messageBuilder.setContent(ByteString.copyFrom(messageContent.get()));
       }
 
       if (source.getRelay().isPresent()) {
@@ -183,9 +245,12 @@ public class MessageController {
 
   private void sendRelayMessage(Account source,
                                 String destinationName,
-                                IncomingMessageList messages)
-      throws IOException, NoSuchUserException
+                                IncomingMessageList messages,
+                                boolean isSyncMessage)
+      throws IOException, NoSuchUserException, InvalidDestinationException
   {
+    if (isSyncMessage) throw new InvalidDestinationException("Transcript messages can't be relayed!");
+
     try {
       FederatedClient client = federatedClientManager.getClient(messages.getRelay());
       client.sendMessages(source.getNumber(), source.getAuthenticatedDevice().get().getId(),
@@ -228,7 +293,9 @@ public class MessageController {
     }
   }
 
-  private void validateCompleteDeviceList(Account account, List<IncomingMessage> messages)
+  private void validateCompleteDeviceList(Account account,
+                                          List<IncomingMessage> messages,
+                                          boolean isSyncMessage)
       throws MismatchedDevicesException
   {
     Set<Long> messageDeviceIds = new HashSet<>();
@@ -242,7 +309,9 @@ public class MessageController {
     }
 
     for (Device device : account.getDevices()) {
-      if (device.isActive()) {
+      if (device.isActive() &&
+          !(isSyncMessage && device.getId() == account.getAuthenticatedDevice().get().getId()))
+      {
         accountDeviceIds.add(device.getId());
 
         if (!messageDeviceIds.contains(device.getId())) {
@@ -279,6 +348,8 @@ public class MessageController {
   }
 
   private Optional<byte[]> getMessageBody(IncomingMessage message) {
+    if (Util.isEmpty(message.getBody())) return Optional.absent();
+
     try {
       return Optional.of(Base64.decode(message.getBody()));
     } catch (IOException ioe) {
@@ -286,4 +357,15 @@ public class MessageController {
       return Optional.absent();
     }
   }
+
+  private Optional<byte[]> getMessageContent(IncomingMessage message) {
+    if (Util.isEmpty(message.getContent())) return Optional.absent();
+
+    try {
+      return Optional.of(Base64.decode(message.getContent()));
+    } catch (IOException ioe) {
+      logger.debug("Bad B64", ioe);
+      return Optional.absent();
+    }
+  }
 }

src/main/java/org/whispersystems/textsecuregcm/controllers/ProvisioningController.java

@@ -0,0 +1,55 @@
+package org.whispersystems.textsecuregcm.controllers;
+
+import com.codahale.metrics.annotation.Timed;
+import org.whispersystems.textsecuregcm.entities.ProvisioningMessage;
+import org.whispersystems.textsecuregcm.limits.RateLimiters;
+import org.whispersystems.textsecuregcm.push.PushSender;
+import org.whispersystems.textsecuregcm.push.WebsocketSender;
+import org.whispersystems.textsecuregcm.storage.Account;
+import org.whispersystems.textsecuregcm.util.Base64;
+import org.whispersystems.textsecuregcm.websocket.InvalidWebsocketAddressException;
+import org.whispersystems.textsecuregcm.websocket.ProvisioningAddress;
+
+import javax.validation.Valid;
+import javax.ws.rs.Consumes;
+import javax.ws.rs.PUT;
+import javax.ws.rs.Path;
+import javax.ws.rs.PathParam;
+import javax.ws.rs.Produces;
+import javax.ws.rs.WebApplicationException;
+import javax.ws.rs.core.MediaType;
+import javax.ws.rs.core.Response;
+import java.io.IOException;
+
+import io.dropwizard.auth.Auth;
+
+@Path("/v1/provisioning")
+public class ProvisioningController {
+
+  private final RateLimiters    rateLimiters;
+  private final WebsocketSender websocketSender;
+
+  public ProvisioningController(RateLimiters rateLimiters, PushSender pushSender) {
+    this.rateLimiters    = rateLimiters;
+    this.websocketSender = pushSender.getWebSocketSender();
+  }
+
+  @Timed
+  @Path("/{destination}")
+  @PUT
+  @Consumes(MediaType.APPLICATION_JSON)
+  @Produces(MediaType.APPLICATION_JSON)
+  public void sendProvisioningMessage(@Auth                     Account source,
+                                      @PathParam("destination") String destinationName,
+                                      @Valid                    ProvisioningMessage message)
+      throws RateLimitExceededException, InvalidWebsocketAddressException, IOException
+  {
+    rateLimiters.getMessagesLimiter().validate(source.getNumber());
+
+    if (!websocketSender.sendProvisioningMessage(new ProvisioningAddress(destinationName, 0),
+                                                 Base64.decode(message.getBody())))
+    {
+      throw new WebApplicationException(Response.Status.NOT_FOUND);
+    }
+  }
+}

src/main/java/org/whispersystems/textsecuregcm/controllers/ReceiptController.java

@@ -2,14 +2,10 @@ package org.whispersystems.textsecuregcm.controllers;
 
 import com.codahale.metrics.annotation.Timed;
 import com.google.common.base.Optional;
-import org.whispersystems.textsecuregcm.federation.FederatedClientManager;
-import org.whispersystems.textsecuregcm.federation.NoSuchPeerException;
 import org.whispersystems.textsecuregcm.push.NotPushRegisteredException;
-import org.whispersystems.textsecuregcm.push.PushSender;
+import org.whispersystems.textsecuregcm.push.ReceiptSender;
 import org.whispersystems.textsecuregcm.push.TransientPushFailureException;
 import org.whispersystems.textsecuregcm.storage.Account;
-import org.whispersystems.textsecuregcm.storage.AccountsManager;
-import org.whispersystems.textsecuregcm.storage.Device;
 
 import javax.ws.rs.PUT;
 import javax.ws.rs.Path;
@@ -18,25 +14,16 @@ import javax.ws.rs.QueryParam;
 import javax.ws.rs.WebApplicationException;
 import javax.ws.rs.core.Response;
 import java.io.IOException;
-import java.util.List;
 
 import io.dropwizard.auth.Auth;
-import static org.whispersystems.textsecuregcm.entities.MessageProtos.OutgoingMessageSignal;
 
 @Path("/v1/receipt")
 public class ReceiptController {
 
-  private final AccountsManager        accountManager;
-  private final PushSender             pushSender;
-  private final FederatedClientManager federatedClientManager;
+  private final ReceiptSender receiptSender;
 
-  public ReceiptController(AccountsManager accountManager,
-                           FederatedClientManager federatedClientManager,
-                           PushSender pushSender)
-  {
-    this.accountManager         = accountManager;
-    this.federatedClientManager = federatedClientManager;
-    this.pushSender             = pushSender;
+  public ReceiptController(ReceiptSender receiptSender) {
+    this.receiptSender = receiptSender;
   }
 
   @Timed
@@ -49,8 +36,7 @@ public class ReceiptController {
       throws IOException
   {
     try {
-      if (relay.isPresent()) sendRelayedReceipt(source, destination, messageId, relay.get());
-      else                   sendDirectReceipt(source, destination, messageId);
+      receiptSender.sendReceipt(source, destination, messageId, relay);
     } catch (NoSuchUserException | NotPushRegisteredException e) {
       throw new WebApplicationException(Response.Status.NOT_FOUND);
     } catch (TransientPushFailureException e) {
@@ -58,51 +44,4 @@ public class ReceiptController {
     }
   }
 
-  private void sendRelayedReceipt(Account source, String destination, long messageId, String relay)
-      throws NoSuchUserException, IOException
-  {
-    try {
-      federatedClientManager.getClient(relay)
-                            .sendDeliveryReceipt(source.getNumber(),
-                                                 source.getAuthenticatedDevice().get().getId(),
-                                                 destination, messageId);
-    } catch (NoSuchPeerException e) {
-      throw new NoSuchUserException(e);
-    }
-  }
-
-  private void sendDirectReceipt(Account source, String destination, long messageId)
-      throws NotPushRegisteredException, TransientPushFailureException, NoSuchUserException
-  {
-    Account      destinationAccount = getDestinationAccount(destination);
-    List<Device> destinationDevices = destinationAccount.getDevices();
-
-    OutgoingMessageSignal.Builder message =
-        OutgoingMessageSignal.newBuilder()
-                             .setSource(source.getNumber())
-                             .setSourceDevice((int) source.getAuthenticatedDevice().get().getId())
-                             .setTimestamp(messageId)
-                             .setType(OutgoingMessageSignal.Type.RECEIPT_VALUE);
-
-    if (source.getRelay().isPresent()) {
-      message.setRelay(source.getRelay().get());
-    }
-
-    for (Device destinationDevice : destinationDevices) {
-      pushSender.sendMessage(destinationAccount, destinationDevice, message.build());
-    }
-  }
-
-  private Account getDestinationAccount(String destination)
-      throws NoSuchUserException
-  {
-    Optional<Account> account = accountManager.get(destination);
-
-    if (!account.isPresent()) {
-      throw new NoSuchUserException(destination);
-    }
-
-    return account.get();
-  }
-
 }

src/main/java/org/whispersystems/textsecuregcm/entities/AccountAttributes.java

@@ -17,40 +17,47 @@
 package org.whispersystems.textsecuregcm.entities;
 
 import com.fasterxml.jackson.annotation.JsonProperty;
+import com.google.common.annotations.VisibleForTesting;
+import org.hibernate.validator.constraints.Length;
 import org.hibernate.validator.constraints.NotEmpty;
 
+import javax.validation.constraints.Max;
+
 public class AccountAttributes {
 
   @JsonProperty
   @NotEmpty
   private String signalingKey;
 
-  @JsonProperty
-  private boolean supportsSms;
-
   @JsonProperty
   private boolean fetchesMessages;
 
   @JsonProperty
   private int registrationId;
 
+  @JsonProperty
+  @Length(max = 50, message = "This field must be less than 50 characters")
+  private String name;
+
   public AccountAttributes() {}
 
-  public AccountAttributes(String signalingKey, boolean supportsSms, boolean fetchesMessages, int registrationId) {
+  @VisibleForTesting
+  public AccountAttributes(String signalingKey, boolean fetchesMessages, int registrationId) {
+    this(signalingKey, fetchesMessages, registrationId, null);
+  }
+
+  @VisibleForTesting
+  public AccountAttributes(String signalingKey, boolean fetchesMessages, int registrationId, String name) {
     this.signalingKey    = signalingKey;
-    this.supportsSms     = supportsSms;
     this.fetchesMessages = fetchesMessages;
     this.registrationId  = registrationId;
+    this.name            = name;
   }
 
   public String getSignalingKey() {
     return signalingKey;
   }
 
-  public boolean getSupportsSms() {
-    return supportsSms;
-  }
-
   public boolean getFetchesMessages() {
     return fetchesMessages;
   }
@@ -58,4 +65,8 @@ public class AccountAttributes {
   public int getRegistrationId() {
     return registrationId;
   }
+
+  public String getName() {
+    return name;
+  }
 }

src/main/java/org/whispersystems/textsecuregcm/entities/ApnMessage.java

@@ -5,8 +5,12 @@ import com.google.common.annotations.VisibleForTesting;
 import org.hibernate.validator.constraints.NotEmpty;
 
 import javax.validation.constraints.Min;
+import javax.validation.constraints.NotNull;
 
 public class ApnMessage {
+
+  public static long MAX_EXPIRATION = Integer.MAX_VALUE * 1000L;
+
   @JsonProperty
   @NotEmpty
   private String apnId;
@@ -23,12 +27,50 @@ public class ApnMessage {
   @NotEmpty
   private String message;
 
+  @JsonProperty
+  @NotNull
+  private boolean voip;
+
+  @JsonProperty
+  private long expirationTime;
+
   public ApnMessage() {}
 
-  public ApnMessage(String apnId, String number, int deviceId, String message) {
-    this.apnId    = apnId;
-    this.number   = number;
-    this.deviceId = deviceId;
-    this.message  = message;
+  public ApnMessage(String apnId, String number, int deviceId, String message, boolean voip, long expirationTime) {
+    this.apnId          = apnId;
+    this.number         = number;
+    this.deviceId       = deviceId;
+    this.message        = message;
+    this.voip           = voip;
+    this.expirationTime = expirationTime;
+  }
+
+  public ApnMessage(ApnMessage copy, String apnId, boolean voip, long expirationTime) {
+    this.apnId          = apnId;
+    this.number         = copy.number;
+    this.deviceId       = copy.deviceId;
+    this.message        = copy.message;
+    this.voip           = voip;
+    this.expirationTime = expirationTime;
+  }
+
+  @VisibleForTesting
+  public String getApnId() {
+    return apnId;
+  }
+
+  @VisibleForTesting
+  public boolean isVoip() {
+    return voip;
+  }
+
+  @VisibleForTesting
+  public String getMessage() {
+    return message;
+  }
+
+  @VisibleForTesting
+  public long getExpirationTime() {
+    return expirationTime;
   }
 }

src/main/java/org/whispersystems/textsecuregcm/entities/ApnRegistrationId.java

@@ -25,7 +25,14 @@ public class ApnRegistrationId {
   @NotEmpty
   private String apnRegistrationId;
 
+  @JsonProperty
+  private String voipRegistrationId;
+
   public String getApnRegistrationId() {
     return apnRegistrationId;
   }
+
+  public String getVoipRegistrationId() {
+    return voipRegistrationId;
+  }
 }

src/main/java/org/whispersystems/textsecuregcm/entities/ClientContact.java

@@ -18,15 +18,10 @@ package org.whispersystems.textsecuregcm.entities;
 
 import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.annotation.JsonProperty;
-import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import com.fasterxml.jackson.databind.annotation.JsonSerialize;
-import com.google.gson.Gson;
-import org.whispersystems.textsecuregcm.util.Base64;
 import org.whispersystems.textsecuregcm.util.ByteArrayAdapter;
 
-import javax.xml.bind.annotation.XmlRootElement;
-import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;
 import java.util.Arrays;
 
 @JsonInclude(JsonInclude.Include.NON_DEFAULT)
@@ -39,12 +34,10 @@ public class ClientContact {
 
   private String  relay;
   private boolean inactive;
-  private boolean supportsSms;
 
-  public ClientContact(byte[] token, String relay, boolean supportsSms) {
-    this.token       = token;
-    this.relay       = relay;
-    this.supportsSms = supportsSms;
+  public ClientContact(byte[] token, String relay) {
+    this.token = token;
+    this.relay = relay;
   }
 
   public ClientContact() {}
@@ -61,10 +54,6 @@ public class ClientContact {
     this.relay = relay;
   }
 
-  public boolean isSupportsSms() {
-    return supportsSms;
-  }
-
   public boolean isInactive() {
     return inactive;
   }
@@ -73,9 +62,9 @@ public class ClientContact {
     this.inactive = inactive;
   }
 
-  public String toString() {
-    return new Gson().toJson(this);
-  }
+//  public String toString() {
+//    return new Gson().toJson(this);
+//  }
 
   @Override
   public boolean equals(Object other) {
@@ -86,7 +75,6 @@ public class ClientContact {
 
     return
         Arrays.equals(this.token, that.token) &&
-        this.supportsSms == that.supportsSms &&
         this.inactive == that.inactive &&
         (this.relay == null ? (that.relay == null) : this.relay.equals(that.relay));
   }

src/main/java/org/whispersystems/textsecuregcm/entities/DeviceInfo.java

@@ -0,0 +1,24 @@
+package org.whispersystems.textsecuregcm.entities;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+public class DeviceInfo {
+  @JsonProperty
+  private long id;
+
+  @JsonProperty
+  private String name;
+
+  @JsonProperty
+  private long lastSeen;
+
+  @JsonProperty
+  private long created;
+
+  public DeviceInfo(long id, String name, long lastSeen, long created) {
+    this.id       = id;
+    this.name     = name;
+    this.lastSeen = lastSeen;
+    this.created  = created;
+  }
+}

src/main/java/org/whispersystems/textsecuregcm/entities/DeviceInfoList.java

@@ -0,0 +1,15 @@
+package org.whispersystems.textsecuregcm.entities;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+import java.util.List;
+
+public class DeviceInfoList {
+
+  @JsonProperty
+  private List<DeviceInfo> devices;
+
+  public DeviceInfoList(List<DeviceInfo> devices) {
+    this.devices = devices;
+  }
+}

src/main/java/org/whispersystems/textsecuregcm/entities/EncryptedOutgoingMessage.java

@@ -18,7 +18,7 @@ package org.whispersystems.textsecuregcm.entities;
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
-import org.whispersystems.textsecuregcm.entities.MessageProtos.OutgoingMessageSignal;
+import org.whispersystems.textsecuregcm.entities.MessageProtos.Envelope;
 import org.whispersystems.textsecuregcm.util.Base64;
 import org.whispersystems.textsecuregcm.util.Util;
 
@@ -41,21 +41,25 @@ public class EncryptedOutgoingMessage {
   private static final int    MAC_KEY_SIZE    = 20;
   private static final int    MAC_SIZE        = 10;
 
-  private final String serialized;
+  private final byte[] serialized;
+  private final String serializedAndEncoded;
 
-  public EncryptedOutgoingMessage(OutgoingMessageSignal outgoingMessage,
-                                  String signalingKey)
+  public EncryptedOutgoingMessage(Envelope outgoingMessage, String signalingKey)
       throws CryptoEncodingException
   {
     byte[]        plaintext  = outgoingMessage.toByteArray();
     SecretKeySpec cipherKey  = getCipherKey (signalingKey);
     SecretKeySpec macKey     = getMacKey(signalingKey);
-    byte[]        ciphertext = getCiphertext(plaintext, cipherKey, macKey);
 
-    this.serialized = Base64.encodeBytes(ciphertext);
+    this.serialized           = getCiphertext(plaintext, cipherKey, macKey);
+    this.serializedAndEncoded = Base64.encodeBytes(this.serialized);
   }
 
-  public String serialize() {
+  public String toEncodedString() {
+    return serializedAndEncoded;
+  }
+
+  public byte[] toByteArray() {
     return serialized;
   }
 

src/main/java/org/whispersystems/textsecuregcm/entities/GcmMessage.java

@@ -20,20 +20,23 @@ public class GcmMessage {
   private int deviceId;
 
   @JsonProperty
-  @NotEmpty
   private String message;
 
   @JsonProperty
   private boolean receipt;
 
+  @JsonProperty
+  private boolean notification;
+
   public GcmMessage() {}
 
-  public GcmMessage(String gcmId, String number, int deviceId, String message, boolean receipt) {
-    this.gcmId    = gcmId;
-    this.number   = number;
-    this.deviceId = deviceId;
-    this.message  = message;
-    this.receipt  = receipt;
+  public GcmMessage(String gcmId, String number, int deviceId, String message, boolean receipt, boolean notification) {
+    this.gcmId        = gcmId;
+    this.number       = number;
+    this.deviceId     = deviceId;
+    this.message      = message;
+    this.receipt      = receipt;
+    this.notification = notification;
   }
 
 }

src/main/java/org/whispersystems/textsecuregcm/entities/GcmRegistrationId.java

@@ -25,9 +25,15 @@ public class GcmRegistrationId {
   @NotEmpty
   private String gcmRegistrationId;
 
+  @JsonProperty
+  private boolean webSocketChannel;
+
   public String getGcmRegistrationId() {
     return gcmRegistrationId;
   }
 
+  public boolean isWebSocketChannel() {
+    return webSocketChannel;
+  }
 }
 

src/main/java/org/whispersystems/textsecuregcm/entities/IncomingMessage.java

@@ -34,9 +34,11 @@ public class IncomingMessage {
   private int destinationRegistrationId;
 
   @JsonProperty
-  @NotEmpty
   private String body;
 
+  @JsonProperty
+  private String content;
+
   @JsonProperty
   private String relay;
 
@@ -67,4 +69,8 @@ public class IncomingMessage {
   public int getDestinationRegistrationId() {
     return destinationRegistrationId;
   }
+
+  public String getContent() {
+    return content;
+  }
 }

src/main/java/org/whispersystems/textsecuregcm/entities/OutgoingMessageEntity.java

@@ -0,0 +1,80 @@
+package org.whispersystems.textsecuregcm.entities;
+
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+public class OutgoingMessageEntity {
+
+  @JsonIgnore
+  private long id;
+
+  @JsonProperty
+  private int type;
+
+  @JsonProperty
+  private String relay;
+
+  @JsonProperty
+  private long timestamp;
+
+  @JsonProperty
+  private String source;
+
+  @JsonProperty
+  private int sourceDevice;
+
+  @JsonProperty
+  private byte[] message;
+
+  @JsonProperty
+  private byte[] content;
+
+  public OutgoingMessageEntity() {}
+
+  public OutgoingMessageEntity(long id, int type, String relay, long timestamp,
+                               String source, int sourceDevice, byte[] message,
+                               byte[] content)
+  {
+    this.id           = id;
+    this.type         = type;
+    this.relay        = relay;
+    this.timestamp    = timestamp;
+    this.source       = source;
+    this.sourceDevice = sourceDevice;
+    this.message      = message;
+    this.content      = content;
+  }
+
+  public int getType() {
+    return type;
+  }
+
+  public String getRelay() {
+    return relay;
+  }
+
+  public long getTimestamp() {
+    return timestamp;
+  }
+
+  public String getSource() {
+    return source;
+  }
+
+  public int getSourceDevice() {
+    return sourceDevice;
+  }
+
+  public byte[] getMessage() {
+    return message;
+  }
+
+  public byte[] getContent() {
+    return content;
+  }
+
+  public long getId() {
+    return id;
+  }
+
+}

src/main/java/org/whispersystems/textsecuregcm/entities/OutgoingMessageEntityList.java

@@ -0,0 +1,23 @@
+package org.whispersystems.textsecuregcm.entities;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.google.common.annotations.VisibleForTesting;
+
+import java.util.List;
+
+public class OutgoingMessageEntityList {
+
+  @JsonProperty
+  private List<OutgoingMessageEntity> messages;
+
+  public OutgoingMessageEntityList() {}
+
+  public OutgoingMessageEntityList(List<OutgoingMessageEntity> messages) {
+    this.messages = messages;
+  }
+
+  @VisibleForTesting
+  public List<OutgoingMessageEntity> getMessages() {
+    return messages;
+  }
+}

src/main/java/org/whispersystems/textsecuregcm/entities/PendingMessage.java

@@ -1,60 +0,0 @@
-package org.whispersystems.textsecuregcm.entities;
-
-import com.fasterxml.jackson.annotation.JsonProperty;
-
-public class PendingMessage {
-
-  @JsonProperty
-  private String sender;
-
-  @JsonProperty
-  private long   messageId;
-
-  @JsonProperty
-  private String encryptedOutgoingMessage;
-
-  @JsonProperty
-  private boolean receipt;
-
-  public PendingMessage() {}
-
-  public PendingMessage(String sender, long messageId, boolean receipt, String encryptedOutgoingMessage) {
-    this.sender                    = sender;
-    this.messageId                 = messageId;
-    this.receipt                   = receipt;
-    this.encryptedOutgoingMessage  = encryptedOutgoingMessage;
-  }
-
-  public String getEncryptedOutgoingMessage() {
-    return encryptedOutgoingMessage;
-  }
-
-  public long getMessageId() {
-    return messageId;
-  }
-
-  public String getSender() {
-    return sender;
-  }
-
-  public boolean isReceipt() {
-    return receipt;
-  }
-
-  @Override
-  public boolean equals(Object other) {
-    if (other == null || !(other instanceof PendingMessage)) return false;
-    PendingMessage that = (PendingMessage)other;
-
-    return
-        this.sender.equals(that.sender) &&
-        this.messageId == that.messageId &&
-        this.receipt == that.receipt     &&
-        this.encryptedOutgoingMessage.equals(that.encryptedOutgoingMessage);
-  }
-
-  @Override
-  public int hashCode() {
-    return this.sender.hashCode() ^ (int)this.messageId ^ this.encryptedOutgoingMessage.hashCode() ^ (receipt ? 1 : 0);
-  }
-}

src/main/java/org/whispersystems/textsecuregcm/entities/PreKeyResponseV2.java

@@ -16,6 +16,7 @@
  */
 package org.whispersystems.textsecuregcm.entities;
 
+import com.fasterxml.jackson.annotation.JsonIgnore;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.google.common.annotations.VisibleForTesting;
 
@@ -42,7 +43,19 @@ public class PreKeyResponseV2 {
   }
 
   @VisibleForTesting
-  public List<PreKeyResponseItemV2> getDevices() {
-    return devices;
+  @JsonIgnore
+  public PreKeyResponseItemV2 getDevice(int deviceId) {
+    for (PreKeyResponseItemV2 device : devices) {
+      if (device.getDeviceId() == deviceId) return device;
+    }
+
+    return null;
   }
+
+  @VisibleForTesting
+  @JsonIgnore
+  public int getDevicesCount() {
+    return devices.size();
+  }
+
 }

src/main/java/org/whispersystems/textsecuregcm/entities/ProvisioningMessage.java

@@ -0,0 +1,15 @@
+package org.whispersystems.textsecuregcm.entities;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import org.hibernate.validator.constraints.NotEmpty;
+
+public class ProvisioningMessage {
+
+  @JsonProperty
+  @NotEmpty
+  private String body;
+
+  public String getBody() {
+    return body;
+  }
+}

src/main/java/org/whispersystems/textsecuregcm/entities/SendMessageResponse.java

@@ -0,0 +1,16 @@
+package org.whispersystems.textsecuregcm.entities;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+public class SendMessageResponse {
+
+  @JsonProperty
+  private boolean needsSync;
+
+  public SendMessageResponse() {}
+
+  public SendMessageResponse(boolean needsSync) {
+    this.needsSync = needsSync;
+  }
+
+}

src/main/java/org/whispersystems/textsecuregcm/entities/UnregisteredEvent.java

@@ -11,6 +11,9 @@ public class UnregisteredEvent {
   @NotEmpty
   private String registrationId;
 
+  @JsonProperty
+  private String canonicalId;
+
   @JsonProperty
   @NotEmpty
   private String number;
@@ -26,6 +29,10 @@ public class UnregisteredEvent {
     return registrationId;
   }
 
+  public String getCanonicalId() {
+    return canonicalId;
+  }
+
   public String getNumber() {
     return number;
   }

src/main/java/org/whispersystems/textsecuregcm/federation/NonLimitedAccount.java

@@ -40,6 +40,6 @@ public class NonLimitedAccount extends Account {
 
   @Override
   public Optional<Device> getAuthenticatedDevice() {
-    return Optional.of(new Device(deviceId, null, null, null, null, null, false, 0, null));
+    return Optional.of(new Device(deviceId, null, null, null, null, null, null, null, false, 0, null, System.currentTimeMillis(), System.currentTimeMillis()));
   }
 }

src/main/java/org/whispersystems/textsecuregcm/limits/LeakyBucket.java

@@ -16,9 +16,13 @@
  */
 package org.whispersystems.textsecuregcm.limits;
 
-import java.io.Serializable;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
 
-public class LeakyBucket implements Serializable {
+import java.io.IOException;
+
+public class LeakyBucket {
 
   private final int    bucketSize;
   private final double leakRatePerMillis;
@@ -27,10 +31,14 @@ public class LeakyBucket implements Serializable {
   private long lastUpdateTimeMillis;
 
   public LeakyBucket(int bucketSize, double leakRatePerMillis) {
+    this(bucketSize, leakRatePerMillis, bucketSize, System.currentTimeMillis());
+  }
+
+  private LeakyBucket(int bucketSize, double leakRatePerMillis, int spaceRemaining, long lastUpdateTimeMillis) {
     this.bucketSize           = bucketSize;
     this.leakRatePerMillis    = leakRatePerMillis;
-    this.spaceRemaining       = bucketSize;
-    this.lastUpdateTimeMillis = System.currentTimeMillis();
+    this.spaceRemaining       = spaceRemaining;
+    this.lastUpdateTimeMillis = lastUpdateTimeMillis;
   }
 
   public boolean add(int amount) {
@@ -50,4 +58,40 @@ public class LeakyBucket implements Serializable {
     return Math.min(this.bucketSize,
                     (int)Math.floor(this.spaceRemaining + (elapsedTime * this.leakRatePerMillis)));
   }
+
+  public String serialize(ObjectMapper mapper) throws JsonProcessingException {
+    return mapper.writeValueAsString(new LeakyBucketEntity(bucketSize, leakRatePerMillis, spaceRemaining, lastUpdateTimeMillis));
+  }
+
+  public static LeakyBucket fromSerialized(ObjectMapper mapper, String serialized) throws IOException {
+    LeakyBucketEntity entity = mapper.readValue(serialized, LeakyBucketEntity.class);
+
+    return new LeakyBucket(entity.bucketSize, entity.leakRatePerMillis,
+                           entity.spaceRemaining, entity.lastUpdateTimeMillis);
+  }
+
+  private static class LeakyBucketEntity {
+    @JsonProperty
+    private int    bucketSize;
+
+    @JsonProperty
+    private double leakRatePerMillis;
+
+    @JsonProperty
+    private int    spaceRemaining;
+
+    @JsonProperty
+    private long   lastUpdateTimeMillis;
+
+    public LeakyBucketEntity() {}
+
+    private LeakyBucketEntity(int bucketSize, double leakRatePerMillis,
+                              int spaceRemaining, long lastUpdateTimeMillis)
+    {
+      this.bucketSize           = bucketSize;
+      this.leakRatePerMillis    = leakRatePerMillis;
+      this.spaceRemaining       = spaceRemaining;
+      this.lastUpdateTimeMillis = lastUpdateTimeMillis;
+    }
+  }
 }

src/main/java/org/whispersystems/textsecuregcm/limits/RateLimiter.java

@@ -19,27 +19,38 @@ package org.whispersystems.textsecuregcm.limits;
 import com.codahale.metrics.Meter;
 import com.codahale.metrics.MetricRegistry;
 import com.codahale.metrics.SharedMetricRegistries;
-import net.spy.memcached.MemcachedClient;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.whispersystems.textsecuregcm.controllers.RateLimitExceededException;
 import org.whispersystems.textsecuregcm.util.Constants;
+import org.whispersystems.textsecuregcm.util.SystemMapper;
+
+import java.io.IOException;
 
 import static com.codahale.metrics.MetricRegistry.name;
+import redis.clients.jedis.Jedis;
+import redis.clients.jedis.JedisPool;
 
 public class RateLimiter {
 
-  private final Meter           meter;
-  private final MemcachedClient memcachedClient;
-  private final String          name;
-  private final int             bucketSize;
-  private final double          leakRatePerMillis;
+  private final Logger       logger = LoggerFactory.getLogger(RateLimiter.class);
+  private final ObjectMapper mapper = SystemMapper.getMapper();
 
-  public RateLimiter(MemcachedClient memcachedClient, String name,
+  private final Meter     meter;
+  private final JedisPool cacheClient;
+  private final String    name;
+  private final int       bucketSize;
+  private final double    leakRatePerMillis;
+
+  public RateLimiter(JedisPool cacheClient, String name,
                      int bucketSize, double leakRatePerMinute)
   {
     MetricRegistry metricRegistry = SharedMetricRegistries.getOrCreate(Constants.METRICS_NAME);
 
     this.meter             = metricRegistry.meter(name(getClass(), name, "exceeded"));
-    this.memcachedClient   = memcachedClient;
+    this.cacheClient       = cacheClient;
     this.name              = name;
     this.bucketSize        = bucketSize;
     this.leakRatePerMillis = leakRatePerMinute / (60.0 * 1000.0);
@@ -61,21 +72,29 @@ public class RateLimiter {
   }
 
   private void setBucket(String key, LeakyBucket bucket) {
-    memcachedClient.set(getBucketName(key),
-                        (int)Math.ceil((bucketSize / leakRatePerMillis) / 1000), bucket);
-  }
-
-  private LeakyBucket getBucket(String key) {
-    LeakyBucket bucket = (LeakyBucket)memcachedClient.get(getBucketName(key));
-
-    if (bucket == null) {
-      return new LeakyBucket(bucketSize, leakRatePerMillis);
-    } else {
-      return bucket;
+    try (Jedis jedis = cacheClient.getResource()) {
+      String serialized = bucket.serialize(mapper);
+      jedis.setex(getBucketName(key), (int) Math.ceil((bucketSize / leakRatePerMillis) / 1000), serialized);
+    } catch (JsonProcessingException e) {
+      throw new IllegalArgumentException(e);
     }
   }
 
+  private LeakyBucket getBucket(String key) {
+    try (Jedis jedis = cacheClient.getResource()) {
+      String serialized = jedis.get(getBucketName(key));
+
+      if (serialized != null) {
+        return LeakyBucket.fromSerialized(mapper, serialized);
+      }
+    } catch (IOException e) {
+      logger.warn("Deserialization error", e);
+    }
+
+    return new LeakyBucket(bucketSize, leakRatePerMillis);
+  }
+
   private String getBucketName(String key) {
-    return LeakyBucket.class.getSimpleName() + name + key;
+    return "leaky_bucket::" + name + "::" + key;
   }
 }

src/main/java/org/whispersystems/textsecuregcm/limits/RateLimiters.java

@@ -17,9 +17,10 @@
 package org.whispersystems.textsecuregcm.limits;
 
 
-import net.spy.memcached.MemcachedClient;
 import org.whispersystems.textsecuregcm.configuration.RateLimitsConfiguration;
 
+import redis.clients.jedis.JedisPool;
+
 public class RateLimiters {
 
   private final RateLimiter smsDestinationLimiter;
@@ -34,40 +35,40 @@ public class RateLimiters {
   private final RateLimiter allocateDeviceLimiter;
   private final RateLimiter verifyDeviceLimiter;
 
-  public RateLimiters(RateLimitsConfiguration config, MemcachedClient memcachedClient) {
-    this.smsDestinationLimiter = new RateLimiter(memcachedClient, "smsDestination",
+  public RateLimiters(RateLimitsConfiguration config, JedisPool cacheClient) {
+    this.smsDestinationLimiter = new RateLimiter(cacheClient, "smsDestination",
                                                  config.getSmsDestination().getBucketSize(),
                                                  config.getSmsDestination().getLeakRatePerMinute());
 
-    this.voiceDestinationLimiter = new RateLimiter(memcachedClient, "voxDestination",
+    this.voiceDestinationLimiter = new RateLimiter(cacheClient, "voxDestination",
                                                    config.getVoiceDestination().getBucketSize(),
                                                    config.getVoiceDestination().getLeakRatePerMinute());
 
-    this.verifyLimiter = new RateLimiter(memcachedClient, "verify",
+    this.verifyLimiter = new RateLimiter(cacheClient, "verify",
                                          config.getVerifyNumber().getBucketSize(),
                                          config.getVerifyNumber().getLeakRatePerMinute());
 
-    this.attachmentLimiter = new RateLimiter(memcachedClient, "attachmentCreate",
+    this.attachmentLimiter = new RateLimiter(cacheClient, "attachmentCreate",
                                              config.getAttachments().getBucketSize(),
                                              config.getAttachments().getLeakRatePerMinute());
 
-    this.contactsLimiter = new RateLimiter(memcachedClient, "contactsQuery",
+    this.contactsLimiter = new RateLimiter(cacheClient, "contactsQuery",
                                            config.getContactQueries().getBucketSize(),
                                            config.getContactQueries().getLeakRatePerMinute());
 
-    this.preKeysLimiter = new RateLimiter(memcachedClient, "prekeys",
+    this.preKeysLimiter = new RateLimiter(cacheClient, "prekeys",
                                           config.getPreKeys().getBucketSize(),
                                           config.getPreKeys().getLeakRatePerMinute());
 
-    this.messagesLimiter = new RateLimiter(memcachedClient, "messages",
+    this.messagesLimiter = new RateLimiter(cacheClient, "messages",
                                            config.getMessages().getBucketSize(),
                                            config.getMessages().getLeakRatePerMinute());
 
-    this.allocateDeviceLimiter = new RateLimiter(memcachedClient, "allocateDevice",
+    this.allocateDeviceLimiter = new RateLimiter(cacheClient, "allocateDevice",
                                                  config.getAllocateDevice().getBucketSize(),
                                                  config.getAllocateDevice().getLeakRatePerMinute());
 
-    this.verifyDeviceLimiter = new RateLimiter(memcachedClient, "verifyDevice",
+    this.verifyDeviceLimiter = new RateLimiter(cacheClient, "verifyDevice",
                                                config.getVerifyDevice().getBucketSize(),
                                                config.getVerifyDevice().getLeakRatePerMinute());
 

src/main/java/org/whispersystems/textsecuregcm/liquibase/AbstractLiquibaseCommand.java

@@ -0,0 +1,65 @@
+package org.whispersystems.textsecuregcm.liquibase;
+
+import com.codahale.metrics.MetricRegistry;
+import net.sourceforge.argparse4j.inf.Namespace;
+
+import java.sql.SQLException;
+
+import io.dropwizard.Configuration;
+import io.dropwizard.cli.ConfiguredCommand;
+import io.dropwizard.db.DataSourceFactory;
+import io.dropwizard.db.DatabaseConfiguration;
+import io.dropwizard.db.ManagedDataSource;
+import io.dropwizard.setup.Bootstrap;
+import liquibase.Liquibase;
+import liquibase.exception.LiquibaseException;
+import liquibase.exception.ValidationFailedException;
+
+public abstract class AbstractLiquibaseCommand<T extends Configuration> extends ConfiguredCommand<T> {
+
+  private final DatabaseConfiguration<T> strategy;
+  private final Class<T>                 configurationClass;
+  private final String                   migrations;
+
+  protected AbstractLiquibaseCommand(String name,
+                                     String description,
+                                     String migrations,
+                                     DatabaseConfiguration<T> strategy,
+                                     Class<T> configurationClass) {
+    super(name, description);
+    this.migrations         = migrations;
+    this.strategy           = strategy;
+    this.configurationClass = configurationClass;
+  }
+
+  @Override
+  protected Class<T> getConfigurationClass() {
+    return configurationClass;
+  }
+
+  @Override
+  @SuppressWarnings("UseOfSystemOutOrSystemErr")
+  protected void run(Bootstrap<T> bootstrap, Namespace namespace, T configuration) throws Exception {
+    final DataSourceFactory dbConfig = strategy.getDataSourceFactory(configuration);
+    dbConfig.setMaxSize(1);
+    dbConfig.setMinSize(1);
+    dbConfig.setInitialSize(1);
+
+    try (final CloseableLiquibase liquibase = openLiquibase(dbConfig, namespace)) {
+      run(namespace, liquibase);
+    } catch (ValidationFailedException e) {
+      e.printDescriptiveError(System.err);
+      throw e;
+    }
+  }
+
+  private CloseableLiquibase openLiquibase(final DataSourceFactory dataSourceFactory, final Namespace namespace)
+      throws ClassNotFoundException, SQLException, LiquibaseException
+  {
+    final ManagedDataSource dataSource = dataSourceFactory.build(new MetricRegistry(), "liquibase");
+    return new CloseableLiquibase(dataSource, migrations);
+  }
+
+  protected abstract void run(Namespace namespace, Liquibase liquibase) throws Exception;
+
+}

src/main/java/org/whispersystems/textsecuregcm/liquibase/CloseableLiquibase.java

@@ -0,0 +1,28 @@
+package org.whispersystems.textsecuregcm.liquibase;
+
+import java.sql.SQLException;
+
+import io.dropwizard.db.ManagedDataSource;
+import liquibase.Liquibase;
+import liquibase.database.jvm.JdbcConnection;
+import liquibase.exception.LiquibaseException;
+import liquibase.resource.ClassLoaderResourceAccessor;
+
+
+public class CloseableLiquibase extends Liquibase implements AutoCloseable {
+  private final ManagedDataSource dataSource;
+
+  public CloseableLiquibase(ManagedDataSource dataSource, String migrations)
+      throws LiquibaseException, ClassNotFoundException, SQLException
+  {
+    super(migrations,
+          new ClassLoaderResourceAccessor(),
+          new JdbcConnection(dataSource.getConnection()));
+    this.dataSource = dataSource;
+  }
+
+  @Override
+  public void close() throws Exception {
+    dataSource.stop();
+  }
+}

src/main/java/org/whispersystems/textsecuregcm/liquibase/DbMigrateCommand.java

@@ -0,0 +1,72 @@
+package org.whispersystems.textsecuregcm.liquibase;
+
+
+import com.google.common.base.Charsets;
+import com.google.common.base.Joiner;
+import net.sourceforge.argparse4j.impl.Arguments;
+import net.sourceforge.argparse4j.inf.Namespace;
+import net.sourceforge.argparse4j.inf.Subparser;
+
+import java.io.OutputStreamWriter;
+import java.util.List;
+
+import io.dropwizard.Configuration;
+import io.dropwizard.db.DatabaseConfiguration;
+import liquibase.Liquibase;
+
+public class DbMigrateCommand<T extends Configuration> extends AbstractLiquibaseCommand<T> {
+
+  public DbMigrateCommand(String migration, DatabaseConfiguration<T> strategy, Class<T> configurationClass) {
+    super("migrate", "Apply all pending change sets.", migration, strategy, configurationClass);
+  }
+
+  @Override
+  public void configure(Subparser subparser) {
+    super.configure(subparser);
+
+    subparser.addArgument("-n", "--dry-run")
+             .action(Arguments.storeTrue())
+             .dest("dry-run")
+             .setDefault(Boolean.FALSE)
+             .help("output the DDL to stdout, don't run it");
+
+    subparser.addArgument("-c", "--count")
+             .type(Integer.class)
+             .dest("count")
+             .help("only apply the next N change sets");
+
+    subparser.addArgument("-i", "--include")
+             .action(Arguments.append())
+             .dest("contexts")
+             .help("include change sets from the given context");
+  }
+
+  @Override
+  @SuppressWarnings("UseOfSystemOutOrSystemErr")
+  public void run(Namespace namespace, Liquibase liquibase) throws Exception {
+    final String context = getContext(namespace);
+    final Integer count = namespace.getInt("count");
+    final Boolean dryRun = namespace.getBoolean("dry-run");
+    if (count != null) {
+      if (dryRun) {
+        liquibase.update(count, context, new OutputStreamWriter(System.out, Charsets.UTF_8));
+      } else {
+        liquibase.update(count, context);
+      }
+    } else {
+      if (dryRun) {
+        liquibase.update(context, new OutputStreamWriter(System.out, Charsets.UTF_8));
+      } else {
+        liquibase.update(context);
+      }
+    }
+  }
+
+  private String getContext(Namespace namespace) {
+    final List<Object> contexts = namespace.getList("contexts");
+    if (contexts == null) {
+      return "";
+    }
+    return Joiner.on(',').join(contexts);
+  }
+}

src/main/java/org/whispersystems/textsecuregcm/liquibase/DbStatusCommand.java

@@ -0,0 +1,51 @@
+package org.whispersystems.textsecuregcm.liquibase;
+
+import com.google.common.base.Charsets;
+import com.google.common.base.Joiner;
+import net.sourceforge.argparse4j.impl.Arguments;
+import net.sourceforge.argparse4j.inf.Namespace;
+import net.sourceforge.argparse4j.inf.Subparser;
+
+import java.io.OutputStreamWriter;
+import java.util.List;
+
+import io.dropwizard.Configuration;
+import io.dropwizard.db.DatabaseConfiguration;
+import liquibase.Liquibase;
+
+public class DbStatusCommand <T extends Configuration> extends AbstractLiquibaseCommand<T> {
+
+  public DbStatusCommand(String migrations, DatabaseConfiguration<T> strategy, Class<T> configurationClass) {
+    super("status", "Check for pending change sets.", migrations, strategy, configurationClass);
+  }
+
+  @Override
+  public void configure(Subparser subparser) {
+    super.configure(subparser);
+
+    subparser.addArgument("-v", "--verbose")
+             .action(Arguments.storeTrue())
+             .dest("verbose")
+             .help("Output verbose information");
+    subparser.addArgument("-i", "--include")
+             .action(Arguments.append())
+             .dest("contexts")
+             .help("include change sets from the given context");
+  }
+
+  @Override
+  @SuppressWarnings("UseOfSystemOutOrSystemErr")
+  public void run(Namespace namespace, Liquibase liquibase) throws Exception {
+    liquibase.reportStatus(namespace.getBoolean("verbose"),
+                           getContext(namespace),
+                           new OutputStreamWriter(System.out, Charsets.UTF_8));
+  }
+
+  private String getContext(Namespace namespace) {
+    final List<Object> contexts = namespace.getList("contexts");
+    if (contexts == null) {
+      return "";
+    }
+    return Joiner.on(',').join(contexts);
+  }
+}

src/main/java/org/whispersystems/textsecuregcm/liquibase/NameableDbCommand.java

@@ -0,0 +1,44 @@
+package org.whispersystems.textsecuregcm.liquibase;
+
+import com.google.common.collect.Maps;
+import net.sourceforge.argparse4j.inf.Namespace;
+import net.sourceforge.argparse4j.inf.Subparser;
+
+import java.util.SortedMap;
+
+import io.dropwizard.Configuration;
+import io.dropwizard.db.DatabaseConfiguration;
+import liquibase.Liquibase;
+
+public class NameableDbCommand<T extends Configuration> extends AbstractLiquibaseCommand<T> {
+  private static final String COMMAND_NAME_ATTR = "subcommand";
+  private final SortedMap<String, AbstractLiquibaseCommand<T>> subcommands;
+
+  public NameableDbCommand(String name, String migrations, DatabaseConfiguration<T> strategy, Class<T> configurationClass) {
+    super(name, "Run database migrations tasks", migrations, strategy, configurationClass);
+    this.subcommands = Maps.newTreeMap();
+    addSubcommand(new DbMigrateCommand<>(migrations, strategy, configurationClass));
+    addSubcommand(new DbStatusCommand<>(migrations, strategy, configurationClass));
+  }
+
+  private void addSubcommand(AbstractLiquibaseCommand<T> subcommand) {
+    subcommands.put(subcommand.getName(), subcommand);
+  }
+
+  @Override
+  public void configure(Subparser subparser) {
+    for (AbstractLiquibaseCommand<T> subcommand : subcommands.values()) {
+      final Subparser cmdParser = subparser.addSubparsers()
+                                           .addParser(subcommand.getName())
+                                           .setDefault(COMMAND_NAME_ATTR, subcommand.getName())
+                                           .description(subcommand.getDescription());
+      subcommand.configure(cmdParser);
+    }
+  }
+
+  @Override
+  public void run(Namespace namespace, Liquibase liquibase) throws Exception {
+    final AbstractLiquibaseCommand<T> subcommand = subcommands.get(namespace.getString(COMMAND_NAME_ATTR));
+    subcommand.run(namespace, liquibase);
+  }
+}

src/main/java/org/whispersystems/textsecuregcm/liquibase/NameableMigrationsBundle.java

@@ -0,0 +1,27 @@
+package org.whispersystems.textsecuregcm.liquibase;
+
+import io.dropwizard.Bundle;
+import io.dropwizard.Configuration;
+import io.dropwizard.db.DatabaseConfiguration;
+import io.dropwizard.setup.Bootstrap;
+import io.dropwizard.setup.Environment;
+import io.dropwizard.util.Generics;
+
+public abstract class NameableMigrationsBundle<T extends Configuration> implements Bundle, DatabaseConfiguration<T> {
+
+  private final String name;
+  private final String migrations;
+
+  public NameableMigrationsBundle(String name, String migrations) {
+    this.name       = name;
+    this.migrations = migrations;
+  }
+
+  public final void initialize(Bootstrap<?> bootstrap) {
+    Class klass = Generics.getTypeParameter(this.getClass(), Configuration.class);
+    bootstrap.addCommand(new NameableDbCommand(name, migrations, this, klass));
+  }
+
+  public final void run(Environment environment) {
+  }
+}

src/main/java/org/whispersystems/textsecuregcm/mappers/DeviceLimitExceededExceptionMapper.java

@@ -0,0 +1,33 @@
+package org.whispersystems.textsecuregcm.mappers;
+
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+import org.whispersystems.textsecuregcm.controllers.DeviceLimitExceededException;
+
+import javax.ws.rs.core.Response;
+import javax.ws.rs.ext.ExceptionMapper;
+import javax.ws.rs.ext.Provider;
+
+@Provider
+public class DeviceLimitExceededExceptionMapper implements ExceptionMapper<DeviceLimitExceededException> {
+  @Override
+  public Response toResponse(DeviceLimitExceededException exception) {
+    return Response.status(411)
+                   .entity(new DeviceLimitExceededDetails(exception.getCurrentDevices(),
+                                                          exception.getMaxDevices()))
+                   .build();
+  }
+
+  private static class DeviceLimitExceededDetails {
+    @JsonProperty
+    private int current;
+    @JsonProperty
+    private int max;
+
+    public DeviceLimitExceededDetails(int current, int max) {
+      this.current = current;
+      this.max     = max;
+    }
+  }
+}

src/main/java/org/whispersystems/textsecuregcm/mappers/IOExceptionMapper.java

@@ -31,7 +31,9 @@ public class IOExceptionMapper implements ExceptionMapper<IOException> {
 
   @Override
   public Response toResponse(IOException e) {
-    logger.warn("IOExceptionMapper", e);
+    if (!(e.getCause() instanceof java.util.concurrent.TimeoutException)) {
+      logger.warn("IOExceptionMapper", e);
+    }
     return Response.status(503).build();
   }
 }

src/main/java/org/whispersystems/textsecuregcm/mappers/InvalidWebsocketAddressExceptionMapper.java

@@ -0,0 +1,15 @@
+package org.whispersystems.textsecuregcm.mappers;
+
+import org.whispersystems.textsecuregcm.websocket.InvalidWebsocketAddressException;
+
+import javax.ws.rs.core.Response;
+import javax.ws.rs.ext.ExceptionMapper;
+import javax.ws.rs.ext.Provider;
+
+@Provider
+public class InvalidWebsocketAddressExceptionMapper implements ExceptionMapper<InvalidWebsocketAddressException> {
+  @Override
+  public Response toResponse(InvalidWebsocketAddressException exception) {
+    return Response.status(Response.Status.BAD_REQUEST).build();
+  }
+}

src/main/java/org/whispersystems/textsecuregcm/metrics/JsonMetricsReporter.java

@@ -27,25 +27,25 @@ import java.util.SortedMap;
 import java.util.concurrent.TimeUnit;
 import java.util.regex.Pattern;
 
-/**
- * Adapted from MetricsServlet.
- */
 public class JsonMetricsReporter extends ScheduledReporter {
 
-  private final Logger      logger  = LoggerFactory.getLogger(JsonMetricsReporter.class);
+  private static final Pattern SIMPLE_NAMES = Pattern.compile("[^a-zA-Z0-9_.\\-~]");
+
+  private final Logger logger  = LoggerFactory.getLogger(JsonMetricsReporter.class);
   private final JsonFactory factory = new JsonFactory();
 
-  private final String table;
-  private final String sunnylabsHost;
+  private final String token;
+  private final String hostname;
   private final String host;
 
-  public JsonMetricsReporter(MetricRegistry registry, String token, String sunnylabsHost)
+  public JsonMetricsReporter(MetricRegistry registry, String token, String hostname,
+                             MetricFilter filter, TimeUnit rateUnit, TimeUnit durationUnit)
       throws UnknownHostException
   {
-    super(registry, "jsonmetrics-reporter", MetricFilter.ALL, TimeUnit.SECONDS, TimeUnit.MILLISECONDS);
-    this.table         = token;
-    this.sunnylabsHost = sunnylabsHost;
-    this.host          = InetAddress.getLocalHost().getHostName();
+    super(registry, "json-reporter", filter, rateUnit, durationUnit);
+    this.token    = token;
+    this.hostname = hostname;
+    this.host     = InetAddress.getLocalHost().getHostName();
   }
 
   @Override
@@ -57,7 +57,7 @@ public class JsonMetricsReporter extends ScheduledReporter {
   {
     try {
       logger.debug("Reporting metrics...");
-      URL url = new URL("https", sunnylabsHost, 443, "/report/metrics?t=" + table + "&h=" + host);
+      URL url = new URL("https", hostname, 443, String.format("/report/metrics?t=%s&h=%s", token, host));
       HttpURLConnection connection = (HttpURLConnection) url.openConnection();
 
       connection.setDoOutput(true);
@@ -175,10 +175,66 @@ public class JsonMetricsReporter extends ScheduledReporter {
     json.writeNumberField("m15", convertRate(meter.getFifteenMinuteRate()));
   }
 
-  private static final Pattern SIMPLE_NAMES = Pattern.compile("[^a-zA-Z0-9_.\\-~]");
 
   private String sanitize(String metricName) {
     return SIMPLE_NAMES.matcher(metricName).replaceAll("_");
   }
 
+  public static Builder forRegistry(MetricRegistry registry) {
+    return new Builder(registry);
+  }
+
+  public static class Builder {
+
+    private final MetricRegistry registry;
+    private       MetricFilter   filter       = MetricFilter.ALL;
+    private       TimeUnit       rateUnit     = TimeUnit.SECONDS;
+    private       TimeUnit       durationUnit = TimeUnit.MILLISECONDS;
+    private       String         token;
+    private       String         hostname;
+
+    private Builder(MetricRegistry registry) {
+      this.registry     = registry;
+      this.rateUnit     = TimeUnit.SECONDS;
+      this.durationUnit = TimeUnit.MILLISECONDS;
+      this.filter       = MetricFilter.ALL;
+    }
+
+    public Builder convertRatesTo(TimeUnit rateUnit) {
+      this.rateUnit = rateUnit;
+      return this;
+    }
+
+    public Builder convertDurationsTo(TimeUnit durationUnit) {
+      this.durationUnit = durationUnit;
+      return this;
+    }
+
+    public Builder filter(MetricFilter filter) {
+      this.filter = filter;
+      return this;
+    }
+
+    public Builder withToken(String token) {
+      this.token = token;
+      return this;
+    }
+
+    public Builder withHostname(String hostname) {
+      this.hostname = hostname;
+      return this;
+    }
+
+    public JsonMetricsReporter build() throws UnknownHostException {
+      if (hostname == null) {
+        throw new IllegalArgumentException("No hostname specified!");
+      }
+
+      if (token == null) {
+        throw new IllegalArgumentException("No token specified!");
+      }
+
+      return new JsonMetricsReporter(registry, token, hostname, filter, rateUnit, durationUnit);
+    }
+  }
 }

src/main/java/org/whispersystems/textsecuregcm/metrics/JsonMetricsReporterFactory.java

@@ -0,0 +1,38 @@
+package org.whispersystems.textsecuregcm.metrics;
+
+import com.codahale.metrics.MetricRegistry;
+import com.codahale.metrics.ScheduledReporter;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.JsonTypeName;
+
+import javax.validation.constraints.NotNull;
+import java.net.UnknownHostException;
+
+import io.dropwizard.metrics.BaseReporterFactory;
+
+@JsonTypeName("json")
+public class JsonMetricsReporterFactory extends BaseReporterFactory {
+
+  @JsonProperty
+  @NotNull
+  private String hostname;
+
+  @JsonProperty
+  @NotNull
+  private String token;
+
+  @Override
+  public ScheduledReporter build(MetricRegistry metricRegistry) {
+    try {
+      return JsonMetricsReporter.forRegistry(metricRegistry)
+                                .withHostname(hostname)
+                                .withToken(token)
+                                .convertRatesTo(getRateUnit())
+                                .convertDurationsTo(getDurationUnit())
+                                .filter(getFilter())
+                                .build();
+    } catch (UnknownHostException e) {
+      throw new IllegalArgumentException(e);
+    }
+  }
+}

src/main/java/org/whispersystems/textsecuregcm/providers/MemcacheHealthCheck.java

@@ -1,53 +0,0 @@
-/**
- * Copyright (C) 2013 Open WhisperSystems
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU Affero General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-package org.whispersystems.textsecuregcm.providers;
-
-import com.codahale.metrics.health.HealthCheck;
-import net.spy.memcached.MemcachedClient;
-
-import java.security.SecureRandom;
-
-public class MemcacheHealthCheck extends HealthCheck {
-
-  private final MemcachedClient client;
-
-  public MemcacheHealthCheck(MemcachedClient client) {
-    this.client = client;
-  }
-
-  @Override
-  protected Result check() throws Exception {
-    if (client == null) {
-      return Result.unhealthy("not configured");
-    }
-
-    int random = SecureRandom.getInstance("SHA1PRNG").nextInt();
-    int value  = SecureRandom.getInstance("SHA1PRNG").nextInt();
-
-    this.client.set("HEALTH" + random, 2000, String.valueOf(value));
-    String result = (String)this.client.get("HEALTH" + random);
-
-    if (result == null || Integer.parseInt(result) != value) {
-      return Result.unhealthy("Fetch failed");
-    }
-
-    this.client.delete("HEALTH" + random);
-
-    return Result.healthy();
-  }
-
-}

src/main/java/org/whispersystems/textsecuregcm/providers/MemcachedClientFactory.java

@@ -1,54 +0,0 @@
-/**
- * Copyright (C) 2013 Open WhisperSystems
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU Affero General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-package org.whispersystems.textsecuregcm.providers;
-
-import net.spy.memcached.AddrUtil;
-import net.spy.memcached.ConnectionFactoryBuilder;
-import net.spy.memcached.MemcachedClient;
-import net.spy.memcached.auth.AuthDescriptor;
-import net.spy.memcached.auth.PlainCallbackHandler;
-import org.whispersystems.textsecuregcm.configuration.MemcacheConfiguration;
-import org.whispersystems.textsecuregcm.util.Util;
-
-import java.io.IOException;
-
-public class MemcachedClientFactory {
-
-  private final MemcachedClient client;
-
-  public MemcachedClientFactory(MemcacheConfiguration config) throws IOException {
-    ConnectionFactoryBuilder builder = new ConnectionFactoryBuilder();
-    builder.setProtocol(ConnectionFactoryBuilder.Protocol.BINARY);
-
-    if (!Util.isEmpty(config.getUser())) {
-      AuthDescriptor ad = new AuthDescriptor(new String[] { "PLAIN" },
-                                             new PlainCallbackHandler(config.getUser(),
-                                                                      config.getPassword()));
-
-      builder.setAuthDescriptor(ad);
-    }
-
-
-    this.client = new MemcachedClient(builder.build(),
-                                      AddrUtil.getAddresses(config.getServers()));
-  }
-
-
-  public MemcachedClient getClient() {
-    return client;
-  }
-}

src/main/java/org/whispersystems/textsecuregcm/providers/RedisClientFactory.java

@@ -16,9 +16,14 @@
  */
 package org.whispersystems.textsecuregcm.providers;
 
-import org.whispersystems.textsecuregcm.configuration.RedisConfiguration;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.whispersystems.dispatch.io.RedisPubSubConnectionFactory;
+import org.whispersystems.dispatch.redis.PubSubConnection;
 import org.whispersystems.textsecuregcm.util.Util;
 
+import java.io.IOException;
+import java.net.Socket;
 import java.net.URI;
 import java.net.URISyntaxException;
 
@@ -26,29 +31,40 @@ import redis.clients.jedis.JedisPool;
 import redis.clients.jedis.JedisPoolConfig;
 import redis.clients.jedis.Protocol;
 
-public class RedisClientFactory {
+public class RedisClientFactory implements RedisPubSubConnectionFactory {
 
+  private final Logger logger = LoggerFactory.getLogger(RedisClientFactory.class);
+
+  private final String    host;
+  private final int       port;
   private final JedisPool jedisPool;
 
-  public RedisClientFactory(RedisConfiguration redisConfig) throws URISyntaxException {
+  public RedisClientFactory(String url) throws URISyntaxException {
     JedisPoolConfig poolConfig = new JedisPoolConfig();
     poolConfig.setTestOnBorrow(true);
 
-    URI    redisURI      = new URI(redisConfig.getUrl());
-    String redisHost     = redisURI.getHost();
-    int    redisPort     = redisURI.getPort();
-    String redisPassword = null;
+    URI redisURI = new URI(url);
 
-    if (!Util.isEmpty(redisURI.getUserInfo())) {
-      redisPassword = redisURI.getUserInfo().split(":",2)[1];
-    }
-
-    this.jedisPool = new JedisPool(poolConfig, redisHost, redisPort,
-                                   Protocol.DEFAULT_TIMEOUT, redisPassword);
+    this.host      = redisURI.getHost();
+    this.port      = redisURI.getPort();
+    this.jedisPool = new JedisPool(poolConfig, host, port,
+                                   Protocol.DEFAULT_TIMEOUT, null);
   }
 
   public JedisPool getRedisClientPool() {
     return jedisPool;
   }
 
+  @Override
+  public PubSubConnection connect() {
+    while (true) {
+      try {
+        Socket socket = new Socket(host, port);
+        return new PubSubConnection(socket);
+      } catch (IOException e) {
+        logger.warn("Error connecting", e);
+        Util.sleep(200);
+      }
+    }
+  }
 }

src/main/java/org/whispersystems/textsecuregcm/push/ApnFallbackManager.java

@@ -0,0 +1,180 @@
+package org.whispersystems.textsecuregcm.push;
+
+import com.codahale.metrics.Histogram;
+import com.codahale.metrics.Meter;
+import com.codahale.metrics.MetricRegistry;
+import com.codahale.metrics.RatioGauge;
+import com.codahale.metrics.SharedMetricRegistries;
+import com.google.common.annotations.VisibleForTesting;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.whispersystems.textsecuregcm.entities.ApnMessage;
+import org.whispersystems.textsecuregcm.util.Constants;
+import org.whispersystems.textsecuregcm.util.Util;
+import org.whispersystems.textsecuregcm.websocket.WebsocketAddress;
+
+import java.util.Iterator;
+import java.util.LinkedHashMap;
+import java.util.Map.Entry;
+import java.util.concurrent.TimeUnit;
+
+import static com.codahale.metrics.MetricRegistry.name;
+import io.dropwizard.lifecycle.Managed;
+
+public class ApnFallbackManager implements Managed, Runnable {
+
+  private static final Logger logger = LoggerFactory.getLogger(ApnFallbackManager.class);
+
+  private static final MetricRegistry metricRegistry          = SharedMetricRegistries.getOrCreate(Constants.METRICS_NAME);
+  private static final Meter          voipOneSuccess          = metricRegistry.meter(name(ApnFallbackManager.class, "voip_one_success"));
+  private static final Meter          voipOneDelivery         = metricRegistry.meter(name(ApnFallbackManager.class, "voip_one_failure"));
+  private static final Histogram      voipOneSuccessHistogram = metricRegistry.histogram(name(ApnFallbackManager.class, "voip_one_success_histogram"));
+
+  static {
+    metricRegistry.register(name(ApnFallbackManager.class, "voip_one_success_ratio"), new VoipRatioGauge(voipOneSuccess, voipOneDelivery));
+  }
+
+  private final ApnFallbackTaskQueue taskQueue = new ApnFallbackTaskQueue();
+  private final PushServiceClient pushServiceClient;
+
+  public ApnFallbackManager(PushServiceClient pushServiceClient) {
+    this.pushServiceClient = pushServiceClient;
+  }
+
+  public void schedule(final WebsocketAddress address, ApnFallbackTask task) {
+    voipOneDelivery.mark();
+    taskQueue.put(address, task);
+  }
+
+  public void cancel(WebsocketAddress address) {
+    ApnFallbackTask task = taskQueue.remove(address);
+
+    if (task != null) {
+      voipOneSuccess.mark();
+      voipOneSuccessHistogram.update(System.currentTimeMillis() - task.getScheduledTime());
+    }
+  }
+
+  @Override
+  public void start() throws Exception {
+    new Thread(this).start();
+  }
+
+  @Override
+  public void stop() throws Exception {
+
+  }
+
+  @Override
+  public void run() {
+    while (true) {
+      try {
+        Entry<WebsocketAddress, ApnFallbackTask> taskEntry  = taskQueue.get();
+        ApnFallbackTask                          task       = taskEntry.getValue();
+
+        pushServiceClient.send(new ApnMessage(task.getMessage(), task.getApnId(),
+                                              false, ApnMessage.MAX_EXPIRATION));
+      } catch (Throwable e) {
+        logger.warn("ApnFallbackThread", e);
+      }
+    }
+  }
+
+  public static class ApnFallbackTask {
+
+    private final long       delay;
+    private final long       scheduledTime;
+    private final String     apnId;
+    private final ApnMessage message;
+
+    public ApnFallbackTask(String apnId, ApnMessage message) {
+      this(apnId, message, TimeUnit.SECONDS.toMillis(30));
+    }
+
+    @VisibleForTesting
+    public ApnFallbackTask(String apnId, ApnMessage message, long delay) {
+      this.scheduledTime = System.currentTimeMillis();
+      this.delay         = delay;
+      this.apnId         = apnId;
+      this.message       = message;
+    }
+
+    public String getApnId() {
+      return apnId;
+    }
+
+    public ApnMessage getMessage() {
+      return message;
+    }
+
+    public long getScheduledTime() {
+      return scheduledTime;
+    }
+
+    public long getExecutionTime() {
+      return scheduledTime + delay;
+    }
+
+    public long getDelay() {
+      return delay;
+    }
+  }
+
+  @VisibleForTesting
+  public static class ApnFallbackTaskQueue {
+
+    private final LinkedHashMap<WebsocketAddress, ApnFallbackTask> tasks = new LinkedHashMap<>();
+
+    public Entry<WebsocketAddress, ApnFallbackTask> get() {
+      while (true) {
+        long timeDelta;
+
+        synchronized (tasks) {
+          while (tasks.isEmpty()) Util.wait(tasks);
+
+          Iterator<Entry<WebsocketAddress, ApnFallbackTask>> iterator  = tasks.entrySet().iterator();
+          Entry<WebsocketAddress, ApnFallbackTask>           nextTask  = iterator.next();
+
+          timeDelta = nextTask.getValue().getExecutionTime() - System.currentTimeMillis();
+
+          if (timeDelta <= 0) {
+            iterator.remove();
+            return nextTask;
+          }
+        }
+
+        Util.sleep(timeDelta);
+      }
+    }
+
+    public void put(WebsocketAddress address, ApnFallbackTask task) {
+      synchronized (tasks) {
+        tasks.put(address, task);
+        tasks.notifyAll();
+      }
+    }
+
+    public ApnFallbackTask remove(WebsocketAddress address) {
+      synchronized (tasks) {
+        return tasks.remove(address);
+      }
+    }
+  }
+
+  private static class VoipRatioGauge extends RatioGauge {
+
+    private final Meter success;
+    private final Meter attempts;
+
+    private VoipRatioGauge(Meter success, Meter attempts) {
+      this.success  = success;
+      this.attempts = attempts;
+    }
+
+    @Override
+    protected Ratio getRatio() {
+      return Ratio.of(success.getFiveMinuteRate(), attempts.getFiveMinuteRate());
+    }
+  }
+
+}

src/main/java/org/whispersystems/textsecuregcm/push/FeedbackHandler.java

@@ -76,7 +76,13 @@ public class FeedbackHandler implements Managed, Runnable {
               event.getTimestamp() > device.get().getPushTimestamp())
           {
             logger.info("GCM Unregister Timestamp matches!");
-            device.get().setGcmId(null);
+
+            if (event.getCanonicalId() != null && !event.getCanonicalId().isEmpty()) {
+              logger.info("It's a canonical ID update...");
+              device.get().setGcmId(event.getCanonicalId());
+            } else {
+              device.get().setGcmId(null);
+            }
             accountsManager.update(account.get());
           }
         }

src/main/java/org/whispersystems/textsecuregcm/push/PushSender.java

@@ -22,80 +22,111 @@ import org.whispersystems.textsecuregcm.entities.ApnMessage;
 import org.whispersystems.textsecuregcm.entities.CryptoEncodingException;
 import org.whispersystems.textsecuregcm.entities.EncryptedOutgoingMessage;
 import org.whispersystems.textsecuregcm.entities.GcmMessage;
-import org.whispersystems.textsecuregcm.entities.PendingMessage;
+import org.whispersystems.textsecuregcm.push.ApnFallbackManager.ApnFallbackTask;
+import org.whispersystems.textsecuregcm.push.WebsocketSender.DeliveryStatus;
 import org.whispersystems.textsecuregcm.storage.Account;
 import org.whispersystems.textsecuregcm.storage.Device;
+import org.whispersystems.textsecuregcm.util.Util;
+import org.whispersystems.textsecuregcm.websocket.WebsocketAddress;
 
-import static org.whispersystems.textsecuregcm.entities.MessageProtos.OutgoingMessageSignal;
+import java.util.concurrent.TimeUnit;
+
+import static org.whispersystems.textsecuregcm.entities.MessageProtos.Envelope;
 
 public class PushSender {
 
   private final Logger logger = LoggerFactory.getLogger(PushSender.class);
 
-  private static final String APN_PAYLOAD = "{\"aps\":{\"sound\":\"default\",\"alert\":{\"loc-key\":\"APN_Message\"},\"content-available\":1,\"category\":\"Signal_Message\"}}";
+  private static final String APN_PAYLOAD = "{\"aps\":{\"sound\":\"default\",\"badge\":%d,\"alert\":{\"loc-key\":\"APN_Message\"}}}";
 
-  private final PushServiceClient pushServiceClient;
-  private final WebsocketSender   webSocketSender;
+  private final ApnFallbackManager apnFallbackManager;
+  private final PushServiceClient  pushServiceClient;
+  private final WebsocketSender    webSocketSender;
 
-  public PushSender(PushServiceClient pushServiceClient, WebsocketSender websocketSender) {
-    this.pushServiceClient = pushServiceClient;
-    this.webSocketSender   = websocketSender;
+  public PushSender(ApnFallbackManager apnFallbackManager, PushServiceClient pushServiceClient, WebsocketSender websocketSender) {
+    this.apnFallbackManager = apnFallbackManager;
+    this.pushServiceClient  = pushServiceClient;
+    this.webSocketSender    = websocketSender;
   }
 
-  public void sendMessage(Account account, Device device, OutgoingMessageSignal message)
+  public void sendMessage(Account account, Device device, Envelope message)
       throws NotPushRegisteredException, TransientPushFailureException
   {
-    try {
-      boolean                  isReceipt        = message.getType() == OutgoingMessageSignal.Type.RECEIPT_VALUE;
-      String                   signalingKey     = device.getSignalingKey();
-      EncryptedOutgoingMessage encryptedMessage = new EncryptedOutgoingMessage(message, signalingKey);
-      PendingMessage           pendingMessage   = new PendingMessage(message.getSource(),
-                                                                     message.getTimestamp(),
-                                                                     isReceipt,
-                                                                     encryptedMessage.serialize());
+    if      (device.getGcmId() != null)   sendGcmMessage(account, device, message);
+    else if (device.getApnId() != null)   sendApnMessage(account, device, message);
+    else if (device.getFetchesMessages()) sendWebSocketMessage(account, device, message);
+    else                                  throw new NotPushRegisteredException("No delivery possible!");
+  }
 
-      sendMessage(account, device, pendingMessage);
+  public WebsocketSender getWebSocketSender() {
+    return webSocketSender;
+  }
+
+  private void sendGcmMessage(Account account, Device device, Envelope message)
+      throws TransientPushFailureException, NotPushRegisteredException
+  {
+    if (device.getFetchesMessages()) sendNotificationGcmMessage(account, device, message);
+    else                             sendPayloadGcmMessage(account, device, message);
+  }
+
+  private void sendPayloadGcmMessage(Account account, Device device, Envelope message)
+      throws TransientPushFailureException, NotPushRegisteredException
+  {
+    try {
+      String                   number           = account.getNumber();
+      long                     deviceId         = device.getId();
+      String                   registrationId   = device.getGcmId();
+      boolean                  isReceipt        = message.getType() == Envelope.Type.RECEIPT;
+      EncryptedOutgoingMessage encryptedMessage = new EncryptedOutgoingMessage(message, device.getSignalingKey());
+      GcmMessage               gcmMessage       = new GcmMessage(registrationId, number, (int) deviceId,
+                                                                 encryptedMessage.toEncodedString(), isReceipt, false);
+
+      pushServiceClient.send(gcmMessage);
     } catch (CryptoEncodingException e) {
       throw new NotPushRegisteredException(e);
     }
   }
 
-  public void sendMessage(Account account, Device device, PendingMessage pendingMessage)
-      throws NotPushRegisteredException, TransientPushFailureException
-  {
-    if      (device.getGcmId() != null)   sendGcmMessage(account, device, pendingMessage);
-    else if (device.getApnId() != null)   sendApnMessage(account, device, pendingMessage);
-    else if (device.getFetchesMessages()) sendWebSocketMessage(account, device, pendingMessage);
-    else                                  throw new NotPushRegisteredException("No delivery possible!");
-  }
-
-  private void sendGcmMessage(Account account, Device device, PendingMessage pendingMessage)
+  private void sendNotificationGcmMessage(Account account, Device device, Envelope message)
       throws TransientPushFailureException
   {
-    String     number         = account.getNumber();
-    long       deviceId       = device.getId();
-    String     registrationId = device.getGcmId();
-    GcmMessage gcmMessage     = new GcmMessage(registrationId, number, (int)deviceId,
-                                               pendingMessage.getEncryptedOutgoingMessage(),
-                                               pendingMessage.isReceipt()                              );
+    DeliveryStatus deliveryStatus = webSocketSender.sendMessage(account, device, message, WebsocketSender.Type.GCM);
 
-    pushServiceClient.send(gcmMessage);
+    if (!deliveryStatus.isDelivered()) {
+      GcmMessage gcmMessage = new GcmMessage(device.getGcmId(), account.getNumber(),
+                                             (int)device.getId(), "", false, true);
+
+      pushServiceClient.send(gcmMessage);
+    }
   }
 
-  private void sendApnMessage(Account account, Device device, PendingMessage outgoingMessage)
+  private void sendApnMessage(Account account, Device device, Envelope outgoingMessage)
       throws TransientPushFailureException
   {
-    boolean online = webSocketSender.sendMessage(account, device, outgoingMessage, true);
+    DeliveryStatus deliveryStatus = webSocketSender.sendMessage(account, device, outgoingMessage, WebsocketSender.Type.APN);
+
+    if (!deliveryStatus.isDelivered() && outgoingMessage.getType() != Envelope.Type.RECEIPT) {
+      ApnMessage apnMessage;
+
+      if (!Util.isEmpty(device.getVoipApnId())) {
+        apnMessage = new ApnMessage(device.getVoipApnId(), account.getNumber(), (int)device.getId(),
+                                    String.format(APN_PAYLOAD, deliveryStatus.getMessageQueueDepth()),
+                                    true, System.currentTimeMillis() + TimeUnit.SECONDS.toMillis(30));
+
+        apnFallbackManager.schedule(new WebsocketAddress(account.getNumber(), device.getId()),
+                                    new ApnFallbackTask(device.getApnId(), apnMessage));
+      } else {
+        apnMessage = new ApnMessage(device.getApnId(), account.getNumber(), (int)device.getId(),
+                                    String.format(APN_PAYLOAD, deliveryStatus.getMessageQueueDepth()),
+                                    false, ApnMessage.MAX_EXPIRATION);
+      }
 
-    if (!online && !outgoingMessage.isReceipt()) {
-      ApnMessage apnMessage = new ApnMessage(device.getApnId(), account.getNumber(),
-                                             (int)device.getId(), APN_PAYLOAD);
       pushServiceClient.send(apnMessage);
     }
   }
 
-  private void sendWebSocketMessage(Account account, Device device, PendingMessage outgoingMessage)
+  private void sendWebSocketMessage(Account account, Device device, Envelope outgoingMessage)
   {
-    webSocketSender.sendMessage(account, device, outgoingMessage, false);
+    webSocketSender.sendMessage(account, device, outgoingMessage, WebsocketSender.Type.WEB);
   }
 }

src/main/java/org/whispersystems/textsecuregcm/push/ReceiptSender.java

@@ -0,0 +1,87 @@
+package org.whispersystems.textsecuregcm.push;
+
+import com.google.common.base.Optional;
+import org.whispersystems.textsecuregcm.controllers.NoSuchUserException;
+import org.whispersystems.textsecuregcm.entities.MessageProtos.Envelope;
+import org.whispersystems.textsecuregcm.federation.FederatedClientManager;
+import org.whispersystems.textsecuregcm.federation.NoSuchPeerException;
+import org.whispersystems.textsecuregcm.storage.Account;
+import org.whispersystems.textsecuregcm.storage.AccountsManager;
+import org.whispersystems.textsecuregcm.storage.Device;
+
+import java.io.IOException;
+import java.util.Set;
+
+public class ReceiptSender {
+
+  private final PushSender             pushSender;
+  private final FederatedClientManager federatedClientManager;
+  private final AccountsManager        accountManager;
+
+  public ReceiptSender(AccountsManager        accountManager,
+                       PushSender             pushSender,
+                       FederatedClientManager federatedClientManager)
+  {
+    this.federatedClientManager = federatedClientManager;
+    this.accountManager         = accountManager;
+    this.pushSender             = pushSender;
+  }
+
+  public void sendReceipt(Account source, String destination,
+                          long messageId, Optional<String> relay)
+      throws IOException, NoSuchUserException,
+             NotPushRegisteredException, TransientPushFailureException
+  {
+    if (relay.isPresent() && !relay.get().isEmpty()) {
+      sendRelayedReceipt(source, destination, messageId, relay.get());
+    } else {
+      sendDirectReceipt(source, destination, messageId);
+    }
+  }
+
+  private void sendRelayedReceipt(Account source, String destination, long messageId, String relay)
+      throws NoSuchUserException, IOException
+  {
+    try {
+      federatedClientManager.getClient(relay)
+                            .sendDeliveryReceipt(source.getNumber(),
+                                                 source.getAuthenticatedDevice().get().getId(),
+                                                 destination, messageId);
+    } catch (NoSuchPeerException e) {
+      throw new NoSuchUserException(e);
+    }
+  }
+
+  private void sendDirectReceipt(Account source, String destination, long messageId)
+      throws NotPushRegisteredException, TransientPushFailureException, NoSuchUserException
+  {
+    Account          destinationAccount = getDestinationAccount(destination);
+    Set<Device>      destinationDevices = destinationAccount.getDevices();
+    Envelope.Builder message            = Envelope.newBuilder()
+                                                  .setSource(source.getNumber())
+                                                  .setSourceDevice((int) source.getAuthenticatedDevice().get().getId())
+                                                  .setTimestamp(messageId)
+                                                  .setType(Envelope.Type.RECEIPT);
+
+    if (source.getRelay().isPresent()) {
+      message.setRelay(source.getRelay().get());
+    }
+
+    for (Device destinationDevice : destinationDevices) {
+      pushSender.sendMessage(destinationAccount, destinationDevice, message.build());
+    }
+  }
+
+  private Account getDestinationAccount(String destination)
+      throws NoSuchUserException
+  {
+    Optional<Account> account = accountManager.get(destination);
+
+    if (!account.isPresent()) {
+      throw new NoSuchUserException(destination);
+    }
+
+    return account.get();
+  }
+
+}

src/main/java/org/whispersystems/textsecuregcm/push/WebsocketSender.java

@@ -19,24 +19,29 @@ package org.whispersystems.textsecuregcm.push;
 import com.codahale.metrics.Meter;
 import com.codahale.metrics.MetricRegistry;
 import com.codahale.metrics.SharedMetricRegistries;
-import com.fasterxml.jackson.core.JsonProcessingException;
-import com.fasterxml.jackson.databind.ObjectMapper;
+import com.google.protobuf.ByteString;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
-import org.whispersystems.textsecuregcm.entities.PendingMessage;
 import org.whispersystems.textsecuregcm.storage.Account;
 import org.whispersystems.textsecuregcm.storage.Device;
+import org.whispersystems.textsecuregcm.storage.MessagesManager;
 import org.whispersystems.textsecuregcm.storage.PubSubManager;
-import org.whispersystems.textsecuregcm.storage.PubSubMessage;
-import org.whispersystems.textsecuregcm.storage.StoredMessages;
 import org.whispersystems.textsecuregcm.util.Constants;
-import org.whispersystems.textsecuregcm.util.SystemMapper;
+import org.whispersystems.textsecuregcm.websocket.ProvisioningAddress;
 import org.whispersystems.textsecuregcm.websocket.WebsocketAddress;
 
 import static com.codahale.metrics.MetricRegistry.name;
+import static org.whispersystems.textsecuregcm.entities.MessageProtos.Envelope;
+import static org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage;
 
 public class WebsocketSender {
 
+  public static enum Type {
+    APN,
+    GCM,
+    WEB
+  }
+
   private static final Logger logger = LoggerFactory.getLogger(WebsocketSender.class);
 
   private final MetricRegistry metricRegistry = SharedMetricRegistries.getOrCreate(Constants.METRICS_NAME);
@@ -47,38 +52,78 @@ public class WebsocketSender {
   private final Meter apnOnlineMeter        = metricRegistry.meter(name(getClass(), "apn_online" ));
   private final Meter apnOfflineMeter       = metricRegistry.meter(name(getClass(), "apn_offline"));
 
-  private static final ObjectMapper mapper = SystemMapper.getMapper();
+  private final Meter gcmOnlineMeter        = metricRegistry.meter(name(getClass(), "gcm_online" ));
+  private final Meter gcmOfflineMeter       = metricRegistry.meter(name(getClass(), "gcm_offline"));
 
-  private final StoredMessages storedMessages;
-  private final PubSubManager  pubSubManager;
+  private final Meter provisioningOnlineMeter  = metricRegistry.meter(name(getClass(), "provisioning_online" ));
+  private final Meter provisioningOfflineMeter = metricRegistry.meter(name(getClass(), "provisioning_offline"));
 
-  public WebsocketSender(StoredMessages storedMessages, PubSubManager pubSubManager) {
-    this.storedMessages = storedMessages;
-    this.pubSubManager  = pubSubManager;
+  private final MessagesManager messagesManager;
+  private final PubSubManager   pubSubManager;
+
+  public WebsocketSender(MessagesManager messagesManager, PubSubManager pubSubManager) {
+    this.messagesManager = messagesManager;
+    this.pubSubManager   = pubSubManager;
   }
 
-  public boolean sendMessage(Account account, Device device, PendingMessage pendingMessage, boolean apn) {
-    try {
-      String           serialized    = mapper.writeValueAsString(pendingMessage);
-      WebsocketAddress address       = new WebsocketAddress(account.getNumber(), device.getId());
-      PubSubMessage    pubSubMessage = new PubSubMessage(PubSubMessage.TYPE_DELIVER, serialized);
+  public DeliveryStatus sendMessage(Account account, Device device, Envelope message, Type channel) {
+    WebsocketAddress address       = new WebsocketAddress(account.getNumber(), device.getId());
+    PubSubMessage    pubSubMessage = PubSubMessage.newBuilder()
+                                                  .setType(PubSubMessage.Type.DELIVER)
+                                                  .setContent(message.toByteString())
+                                                  .build();
 
-      if (pubSubManager.publish(address, pubSubMessage)) {
-        if (apn) apnOnlineMeter.mark();
-        else     websocketOnlineMeter.mark();
+    if (pubSubManager.publish(address, pubSubMessage)) {
+      if      (channel == Type.APN) apnOnlineMeter.mark();
+      else if (channel == Type.GCM) gcmOnlineMeter.mark();
+      else                          websocketOnlineMeter.mark();
 
-        return true;
-      } else {
-        if (apn) apnOfflineMeter.mark();
-        else     websocketOfflineMeter.mark();
+      return new DeliveryStatus(true, 0);
+    } else {
+      if      (channel == Type.APN) apnOfflineMeter.mark();
+      else if (channel == Type.GCM) gcmOfflineMeter.mark();
+      else                          websocketOfflineMeter.mark();
 
-        storedMessages.insert(address, pendingMessage);
-        pubSubManager.publish(address, new PubSubMessage(PubSubMessage.TYPE_QUERY_DB, null));
-        return false;
-      }
-    } catch (JsonProcessingException e) {
-      logger.warn("WebsocketSender", "Unable to serialize json", e);
+      int queueDepth = messagesManager.insert(account.getNumber(), device.getId(), message);
+      pubSubManager.publish(address, PubSubMessage.newBuilder()
+                                                  .setType(PubSubMessage.Type.QUERY_DB)
+                                                  .build());
+
+      return new DeliveryStatus(false, queueDepth);
+    }
+  }
+
+  public boolean sendProvisioningMessage(ProvisioningAddress address, byte[] body) {
+    PubSubMessage    pubSubMessage = PubSubMessage.newBuilder()
+                                                  .setType(PubSubMessage.Type.DELIVER)
+                                                  .setContent(ByteString.copyFrom(body))
+                                                  .build();
+
+    if (pubSubManager.publish(address, pubSubMessage)) {
+      provisioningOnlineMeter.mark();
+      return true;
+    } else {
+      provisioningOfflineMeter.mark();
       return false;
     }
   }
+
+  public static class DeliveryStatus {
+
+    private final boolean delivered;
+    private final int     messageQueueDepth;
+
+    public DeliveryStatus(boolean delivered, int messageQueueDepth) {
+      this.delivered = delivered;
+      this.messageQueueDepth = messageQueueDepth;
+    }
+
+    public boolean isDelivered() {
+      return delivered;
+    }
+
+    public int getMessageQueueDepth() {
+      return messageQueueDepth;
+    }
+  }
 }

src/main/java/org/whispersystems/textsecuregcm/sms/SmsSender.java

@@ -53,7 +53,7 @@ public class SmsSender {
       try {
         twilioSender.deliverSmsVerification(destination, verificationCode);
       } catch (TwilioRestException e) {
-        logger.info("Twilio SMS Fallback", e);
+        logger.info("Twilio SMS Failed: " + e.getErrorMessage());
         if (nexmoSender.isPresent()) {
           nexmoSender.get().deliverSmsVerification(destination, verificationCode);
         }
@@ -70,7 +70,7 @@ public class SmsSender {
       try {
         twilioSender.deliverVoxVerification(destination, verificationCode);
       } catch (TwilioRestException e) {
-        logger.info("Twilio Vox Fallback", e);
+        logger.info("Twilio Vox Failed: " + e.getErrorMessage());
         if (nexmoSender.isPresent()) {
           nexmoSender.get().deliverVoxVerification(destination, verificationCode);
         }

src/main/java/org/whispersystems/textsecuregcm/sms/TwilioSmsSender.java

@@ -40,7 +40,7 @@ public class TwilioSmsSender {
 
   public static final String SAY_TWIML = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" +
                                          "<Response>\n" +
-                                         "    <Say voice=\"woman\" language=\"en\">" + SmsSender.VOX_VERIFICATION_TEXT + "%s</Say>\n" +
+                                         "    <Say voice=\"woman\" language=\"en\" loop=\"3\">" + SmsSender.VOX_VERIFICATION_TEXT + "%s.</Say>\n" +
                                          "</Response>";
 
   private final MetricRegistry metricRegistry = SharedMetricRegistries.getOrCreate(Constants.METRICS_NAME);

src/main/java/org/whispersystems/textsecuregcm/storage/Account.java

@@ -22,8 +22,8 @@ import com.fasterxml.jackson.annotation.JsonProperty;
 import com.google.common.annotations.VisibleForTesting;
 import com.google.common.base.Optional;
 
-import java.util.LinkedList;
-import java.util.List;
+import java.util.HashSet;
+import java.util.Set;
 
 public class Account {
 
@@ -33,32 +33,28 @@ public class Account {
   private String number;
 
   @JsonProperty
-  private boolean supportsSms;
-
-  @JsonProperty
-  private List<Device> devices = new LinkedList<>();
+  private Set<Device> devices = new HashSet<>();
 
   @JsonProperty
   private String identityKey;
 
   @JsonIgnore
-  private Optional<Device> authenticatedDevice;
+  private Device authenticatedDevice;
 
   public Account() {}
 
   @VisibleForTesting
-  public Account(String number, boolean supportsSms, List<Device> devices) {
-    this.number      = number;
-    this.supportsSms = supportsSms;
-    this.devices     = devices;
+  public Account(String number, Set<Device> devices) {
+    this.number  = number;
+    this.devices = devices;
   }
 
   public Optional<Device> getAuthenticatedDevice() {
-    return authenticatedDevice;
+    return Optional.fromNullable(authenticatedDevice);
   }
 
   public void setAuthenticatedDevice(Device device) {
-    this.authenticatedDevice = Optional.of(device);
+    this.authenticatedDevice = device;
   }
 
   public void setNumber(String number) {
@@ -69,23 +65,16 @@ public class Account {
     return number;
   }
 
-  public boolean getSupportsSms() {
-    return supportsSms;
-  }
-
-  public void setSupportsSms(boolean supportsSms) {
-    this.supportsSms = supportsSms;
-  }
-
   public void addDevice(Device device) {
+    this.devices.remove(device);
     this.devices.add(device);
   }
 
-  public void setDevices(List<Device> devices) {
-    this.devices = devices;
+  public void removeDevice(long deviceId) {
+    this.devices.remove(new Device(deviceId, null, null, null, null, null, null, null, false, 0, null, 0, 0));
   }
 
-  public List<Device> getDevices() {
+  public Set<Device> getDevices() {
     return devices;
   }
 
@@ -113,7 +102,9 @@ public class Account {
     long highestDevice = Device.MASTER_ID;
 
     for (Device device : devices) {
-      if (device.getId() > highestDevice) {
+      if (!device.isActive()) {
+        return device.getId();
+      } else if (device.getId() > highestDevice) {
         highestDevice = device.getId();
       }
     }
@@ -121,6 +112,16 @@ public class Account {
     return highestDevice + 1;
   }
 
+  public int getActiveDeviceCount() {
+    int count = 0;
+
+    for (Device device : devices) {
+      if (device.isActive()) count++;
+    }
+
+    return count;
+  }
+
   public boolean isRateLimited() {
     return true;
   }

src/main/java/org/whispersystems/textsecuregcm/storage/AccountsManager.java

@@ -17,12 +17,9 @@
 package org.whispersystems.textsecuregcm.storage;
 
 
-import com.fasterxml.jackson.annotation.JsonAutoDetect;
-import com.fasterxml.jackson.annotation.PropertyAccessor;
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.google.common.base.Optional;
-import net.spy.memcached.MemcachedClient;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.whispersystems.textsecuregcm.entities.ClientContact;
@@ -33,23 +30,26 @@ import java.io.IOException;
 import java.util.Iterator;
 import java.util.List;
 
+import redis.clients.jedis.Jedis;
+import redis.clients.jedis.JedisPool;
+
 public class AccountsManager {
 
   private final Logger logger = LoggerFactory.getLogger(AccountsManager.class);
 
   private final Accounts         accounts;
-  private final MemcachedClient  memcachedClient;
+  private final JedisPool        cacheClient;
   private final DirectoryManager directory;
   private final ObjectMapper     mapper;
 
   public AccountsManager(Accounts accounts,
                          DirectoryManager directory,
-                         MemcachedClient memcachedClient)
+                         JedisPool cacheClient)
   {
-    this.accounts        = accounts;
-    this.directory       = directory;
-    this.memcachedClient = memcachedClient;
-    this.mapper          = SystemMapper.getMapper();
+    this.accounts    = accounts;
+    this.directory   = directory;
+    this.cacheClient = cacheClient;
+    this.mapper      = SystemMapper.getMapper();
   }
 
   public long getCount() {
@@ -100,7 +100,7 @@ public class AccountsManager {
   private void updateDirectory(Account account) {
     if (account.isActive()) {
       byte[]        token         = Util.getContactToken(account.getNumber());
-      ClientContact clientContact = new ClientContact(token, null, account.getSupportsSms());
+      ClientContact clientContact = new ClientContact(token, null);
       directory.add(clientContact);
     } else {
       directory.remove(account.getNumber());
@@ -112,25 +112,19 @@ public class AccountsManager {
   }
 
   private void memcacheSet(String number, Account account) {
-    if (memcachedClient != null) {
-      try {
-        String json = mapper.writeValueAsString(account);
-        memcachedClient.set(getKey(number), 0, json);
-      } catch (JsonProcessingException e) {
-        throw new IllegalArgumentException(e);
-      }
+    try (Jedis jedis = cacheClient.getResource()) {
+      jedis.set(getKey(number), mapper.writeValueAsString(account));
+    } catch (JsonProcessingException e) {
+      throw new IllegalArgumentException(e);
     }
   }
 
   private Optional<Account> memcacheGet(String number) {
-    if (memcachedClient == null) return Optional.absent();
-
-    try {
-      String json = (String)memcachedClient.get(getKey(number));
+    try (Jedis jedis = cacheClient.getResource()) {
+      String json = jedis.get(getKey(number));
 
       if (json != null) return Optional.of(mapper.readValue(json, Account.class));
       else              return Optional.absent();
-
     } catch (IOException e) {
       logger.warn("AccountsManager", "Deserialization error", e);
       return Optional.absent();

src/main/java/org/whispersystems/textsecuregcm/storage/Device.java

@@ -22,6 +22,8 @@ import org.whispersystems.textsecuregcm.auth.AuthenticationCredentials;
 import org.whispersystems.textsecuregcm.entities.SignedPreKey;
 import org.whispersystems.textsecuregcm.util.Util;
 
+import java.util.concurrent.TimeUnit;
+
 public class Device {
 
   public static final long MASTER_ID = 1;
@@ -29,6 +31,9 @@ public class Device {
   @JsonProperty
   private long    id;
 
+  @JsonProperty
+  private String  name;
+
   @JsonProperty
   private String  authToken;
 
@@ -44,6 +49,9 @@ public class Device {
   @JsonProperty
   private String  apnId;
 
+  @JsonProperty
+  private String  voipApnId;
+
   @JsonProperty
   private long pushTimestamp;
 
@@ -56,22 +64,33 @@ public class Device {
   @JsonProperty
   private SignedPreKey signedPreKey;
 
+  @JsonProperty
+  private long lastSeen;
+
+  @JsonProperty
+  private long created;
+
   public Device() {}
 
-  public Device(long id, String authToken, String salt,
+  public Device(long id, String name, String authToken, String salt,
                 String signalingKey, String gcmId, String apnId,
-                boolean fetchesMessages, int registrationId,
-                SignedPreKey signedPreKey)
+                String voipApnId, boolean fetchesMessages,
+                int registrationId, SignedPreKey signedPreKey,
+                long lastSeen, long created)
   {
     this.id              = id;
+    this.name            = name;
     this.authToken       = authToken;
     this.salt            = salt;
     this.signalingKey    = signalingKey;
     this.gcmId           = gcmId;
     this.apnId           = apnId;
+    this.voipApnId       = voipApnId;
     this.fetchesMessages = fetchesMessages;
     this.registrationId  = registrationId;
     this.signedPreKey    = signedPreKey;
+    this.lastSeen        = lastSeen;
+    this.created         = created;
   }
 
   public String getApnId() {
@@ -86,6 +105,30 @@ public class Device {
     }
   }
 
+  public String getVoipApnId() {
+    return voipApnId;
+  }
+
+  public void setVoipApnId(String voipApnId) {
+    this.voipApnId = voipApnId;
+  }
+
+  public void setLastSeen(long lastSeen) {
+    this.lastSeen = lastSeen;
+  }
+
+  public long getLastSeen() {
+    return lastSeen;
+  }
+
+  public void setCreated(long created) {
+    this.created = created;
+  }
+
+  public long getCreated() {
+    return this.created;
+  }
+
   public String getGcmId() {
     return gcmId;
   }
@@ -106,6 +149,14 @@ public class Device {
     this.id = id;
   }
 
+  public String getName() {
+    return name;
+  }
+
+  public void setName(String name) {
+    this.name = name;
+  }
+
   public void setAuthenticationCredentials(AuthenticationCredentials credentials) {
     this.authToken = credentials.getHashedAuthenticationToken();
     this.salt      = credentials.getSalt();
@@ -124,7 +175,10 @@ public class Device {
   }
 
   public boolean isActive() {
-    return fetchesMessages || !Util.isEmpty(getApnId()) || !Util.isEmpty(getGcmId());
+    boolean hasChannel = fetchesMessages || !Util.isEmpty(getApnId()) || !Util.isEmpty(getGcmId());
+
+    return (id == MASTER_ID && hasChannel) ||
+           (id != MASTER_ID && hasChannel && signedPreKey != null && lastSeen > (System.currentTimeMillis() - TimeUnit.DAYS.toMillis(30)));
   }
 
   public boolean getFetchesMessages() {
@@ -158,4 +212,17 @@ public class Device {
   public long getPushTimestamp() {
     return pushTimestamp;
   }
+
+  @Override
+  public boolean equals(Object other) {
+    if (other == null || !(other instanceof Device)) return false;
+
+    Device that = (Device)other;
+    return this.id == that.id;
+  }
+
+  @Override
+  public int hashCode() {
+    return (int)this.id;
+  }
 }

src/main/java/org/whispersystems/textsecuregcm/storage/DirectoryManager.java

@@ -16,14 +16,19 @@
  */
 package org.whispersystems.textsecuregcm.storage;
 
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.DeserializationFeature;
+import com.fasterxml.jackson.databind.ObjectMapper;
 import com.google.common.base.Optional;
-import com.google.gson.Gson;
-import com.google.gson.annotations.SerializedName;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.whispersystems.textsecuregcm.entities.ClientContact;
 import org.whispersystems.textsecuregcm.util.IterablePair;
 import org.whispersystems.textsecuregcm.util.Pair;
 import org.whispersystems.textsecuregcm.util.Util;
 
+import java.io.IOException;
 import java.util.LinkedList;
 import java.util.List;
 
@@ -34,12 +39,17 @@ import redis.clients.jedis.Response;
 
 public class DirectoryManager {
 
+  private final Logger logger = LoggerFactory.getLogger(DirectoryManager.class);
+
   private static final byte[] DIRECTORY_KEY = {'d', 'i', 'r', 'e', 'c', 't', 'o', 'r', 'y'};
 
+  private final ObjectMapper objectMapper;
   private final JedisPool redisPool;
 
   public DirectoryManager(JedisPool redisPool) {
-    this.redisPool = redisPool;
+    this.redisPool    = redisPool;
+    this.objectMapper = new ObjectMapper();
+    this.objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
   }
 
   public void remove(String number) {
@@ -62,46 +72,49 @@ public class DirectoryManager {
   }
 
   public void add(ClientContact contact) {
-    TokenValue tokenValue = new TokenValue(contact.getRelay(), contact.isSupportsSms());
-    Jedis      jedis      = redisPool.getResource();
+    TokenValue tokenValue = new TokenValue(contact.getRelay());
 
-    jedis.hset(DIRECTORY_KEY, contact.getToken(), new Gson().toJson(tokenValue).getBytes());
-    redisPool.returnResource(jedis);
+    try (Jedis jedis = redisPool.getResource()) {
+      jedis.hset(DIRECTORY_KEY, contact.getToken(), objectMapper.writeValueAsBytes(tokenValue));
+    } catch (JsonProcessingException e) {
+      logger.warn("JSON Serialization", e);
+    }
   }
 
   public void add(BatchOperationHandle handle, ClientContact contact) {
-    Pipeline   pipeline   = handle.pipeline;
-    TokenValue tokenValue = new TokenValue(contact.getRelay(), contact.isSupportsSms());
+    try {
+      Pipeline   pipeline   = handle.pipeline;
+      TokenValue tokenValue = new TokenValue(contact.getRelay());
 
-    pipeline.hset(DIRECTORY_KEY, contact.getToken(), new Gson().toJson(tokenValue).getBytes());
+      pipeline.hset(DIRECTORY_KEY, contact.getToken(), objectMapper.writeValueAsBytes(tokenValue));
+    } catch (JsonProcessingException e) {
+      logger.warn("JSON Serialization", e);
+    }
   }
 
   public PendingClientContact get(BatchOperationHandle handle, byte[] token) {
     Pipeline pipeline = handle.pipeline;
-    return new PendingClientContact(token, pipeline.hget(DIRECTORY_KEY, token));
+    return new PendingClientContact(objectMapper, token, pipeline.hget(DIRECTORY_KEY, token));
   }
 
   public Optional<ClientContact> get(byte[] token) {
-    Jedis jedis = redisPool.getResource();
-
-    try {
+    try (Jedis jedis = redisPool.getResource()) {
       byte[] result = jedis.hget(DIRECTORY_KEY, token);
 
       if (result == null) {
         return Optional.absent();
       }
 
-      TokenValue tokenValue = new Gson().fromJson(new String(result), TokenValue.class);
-      return Optional.of(new ClientContact(token, tokenValue.relay, tokenValue.supportsSms));
-    } finally {
-      redisPool.returnResource(jedis);
+      TokenValue tokenValue = objectMapper.readValue(result, TokenValue.class);
+      return Optional.of(new ClientContact(token, tokenValue.relay));
+    } catch (IOException e) {
+      logger.warn("JSON Error", e);
+      return Optional.absent();
     }
   }
 
   public List<ClientContact> get(List<byte[]> tokens) {
-    Jedis jedis = redisPool.getResource();
-
-    try {
+    try (Jedis jedis = redisPool.getResource()) {
       Pipeline               pipeline = jedis.pipelined();
       List<Response<byte[]>> futures  = new LinkedList<>();
       List<ClientContact>    results  = new LinkedList<>();
@@ -117,17 +130,19 @@ public class DirectoryManager {
       IterablePair<byte[], Response<byte[]>> lists = new IterablePair<>(tokens, futures);
 
       for (Pair<byte[], Response<byte[]>> pair : lists) {
-        if (pair.second().get() != null) {
-          TokenValue    tokenValue    = new Gson().fromJson(new String(pair.second().get()), TokenValue.class);
-          ClientContact clientContact = new ClientContact(pair.first(), tokenValue.relay, tokenValue.supportsSms);
+        try {
+          if (pair.second().get() != null) {
+            TokenValue    tokenValue    = objectMapper.readValue(pair.second().get(), TokenValue.class);
+            ClientContact clientContact = new ClientContact(pair.first(), tokenValue.relay);
 
-          results.add(clientContact);
+            results.add(clientContact);
+          }
+        } catch (IOException e) {
+          logger.warn("Deserialization Problem: ", e);
         }
       }
 
       return results;
-    } finally {
-      redisPool.returnResource(jedis);
     }
   }
 
@@ -156,36 +171,37 @@ public class DirectoryManager {
   }
 
   private static class TokenValue {
-    @SerializedName("r")
+
+    @JsonProperty(value = "r")
     private String  relay;
 
-    @SerializedName("s")
-    private boolean supportsSms;
+    public TokenValue() {}
 
-    public TokenValue(String relay, boolean supportsSms) {
-      this.relay       = relay;
-      this.supportsSms = supportsSms;
+    public TokenValue(String relay) {
+      this.relay = relay;
     }
   }
 
   public static class PendingClientContact {
+    private final ObjectMapper     objectMapper;
     private final byte[]           token;
     private final Response<byte[]> response;
 
-    PendingClientContact(byte[] token, Response<byte[]> response) {
-      this.token    = token;
-      this.response = response;
+    PendingClientContact(ObjectMapper objectMapper, byte[] token, Response<byte[]> response) {
+      this.objectMapper = objectMapper;
+      this.token        = token;
+      this.response     = response;
     }
 
-    public Optional<ClientContact> get() {
+    public Optional<ClientContact> get() throws IOException {
       byte[] result = response.get();
 
       if (result == null) {
         return Optional.absent();
       }
 
-      TokenValue tokenValue = new Gson().fromJson(new String(result), TokenValue.class);
-      return Optional.of(new ClientContact(token, tokenValue.relay, tokenValue.supportsSms));
+      TokenValue tokenValue = objectMapper.readValue(result, TokenValue.class);
+      return Optional.of(new ClientContact(token, tokenValue.relay));
     }
 
   }

src/main/java/org/whispersystems/textsecuregcm/storage/Messages.java

@@ -0,0 +1,107 @@
+package org.whispersystems.textsecuregcm.storage;
+
+import org.skife.jdbi.v2.SQLStatement;
+import org.skife.jdbi.v2.StatementContext;
+import org.skife.jdbi.v2.sqlobject.Bind;
+import org.skife.jdbi.v2.sqlobject.Binder;
+import org.skife.jdbi.v2.sqlobject.BinderFactory;
+import org.skife.jdbi.v2.sqlobject.BindingAnnotation;
+import org.skife.jdbi.v2.sqlobject.SqlQuery;
+import org.skife.jdbi.v2.sqlobject.SqlUpdate;
+import org.skife.jdbi.v2.sqlobject.customizers.Mapper;
+import org.skife.jdbi.v2.tweak.ResultSetMapper;
+import org.whispersystems.textsecuregcm.entities.MessageProtos.Envelope;
+import org.whispersystems.textsecuregcm.entities.OutgoingMessageEntity;
+
+import java.lang.annotation.Annotation;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.List;
+
+public abstract class Messages {
+
+  private static final String ID                 = "id";
+  private static final String TYPE               = "type";
+  private static final String RELAY              = "relay";
+  private static final String TIMESTAMP          = "timestamp";
+  private static final String SOURCE             = "source";
+  private static final String SOURCE_DEVICE      = "source_device";
+  private static final String DESTINATION        = "destination";
+  private static final String DESTINATION_DEVICE = "destination_device";
+  private static final String MESSAGE            = "message";
+  private static final String CONTENT            = "content";
+
+  @SqlQuery("INSERT INTO messages (" + TYPE + ", " + RELAY + ", " + TIMESTAMP + ", " + SOURCE + ", " + SOURCE_DEVICE + ", " + DESTINATION + ", " + DESTINATION_DEVICE + ", " + MESSAGE + ", " + CONTENT + ") " +
+            "VALUES (:type, :relay, :timestamp, :source, :source_device, :destination, :destination_device, :message, :content) " +
+            "RETURNING (SELECT COUNT(id) FROM messages WHERE " + DESTINATION + " = :destination AND " + DESTINATION_DEVICE + " = :destination_device AND " + TYPE + " != " + Envelope.Type.RECEIPT_VALUE + ")")
+  abstract int store(@MessageBinder Envelope message,
+                     @Bind("destination") String destination,
+                     @Bind("destination_device") long destinationDevice);
+
+  @Mapper(MessageMapper.class)
+  @SqlQuery("SELECT * FROM messages WHERE " + DESTINATION + " = :destination AND " + DESTINATION_DEVICE + " = :destination_device ORDER BY " + TIMESTAMP + " ASC")
+  abstract List<OutgoingMessageEntity> load(@Bind("destination")        String destination,
+                                            @Bind("destination_device") long destinationDevice);
+
+  @Mapper(MessageMapper.class)
+  @SqlQuery("DELETE FROM messages WHERE " + ID + " IN (SELECT " + ID + " FROM messages WHERE " + DESTINATION + " = :destination AND " + SOURCE + " = :source AND " + TIMESTAMP + " = :timestamp ORDER BY " + ID + " LIMIT 1) RETURNING *")
+  abstract OutgoingMessageEntity remove(@Bind("destination") String destination, @Bind("source") String source, @Bind("timestamp") long timestamp);
+
+  @Mapper(MessageMapper.class)
+  @SqlUpdate("DELETE FROM messages WHERE " + ID + " = :id AND " + DESTINATION + " = :destination")
+  abstract void remove(@Bind("destination") String destination, @Bind("id") long id);
+
+  @SqlUpdate("DELETE FROM messages WHERE " + DESTINATION + " = :destination")
+  abstract void clear(@Bind("destination") String destination);
+
+  @SqlUpdate("VACUUM messages")
+  public abstract void vacuum();
+
+  public static class MessageMapper implements ResultSetMapper<OutgoingMessageEntity> {
+    @Override
+    public OutgoingMessageEntity map(int i, ResultSet resultSet, StatementContext statementContext)
+        throws SQLException
+    {
+      return new OutgoingMessageEntity(resultSet.getLong(ID),
+                                       resultSet.getInt(TYPE),
+                                       resultSet.getString(RELAY),
+                                       resultSet.getLong(TIMESTAMP),
+                                       resultSet.getString(SOURCE),
+                                       resultSet.getInt(SOURCE_DEVICE),
+                                       resultSet.getBytes(MESSAGE),
+                                       resultSet.getBytes(CONTENT));
+    }
+  }
+
+  @BindingAnnotation(MessageBinder.AccountBinderFactory.class)
+  @Retention(RetentionPolicy.RUNTIME)
+  @Target({ElementType.PARAMETER})
+  public @interface MessageBinder {
+    public static class AccountBinderFactory implements BinderFactory {
+      @Override
+      public Binder build(Annotation annotation) {
+        return new Binder<MessageBinder, Envelope>() {
+          @Override
+          public void bind(SQLStatement<?> sql,
+                           MessageBinder accountBinder,
+                           Envelope message)
+          {
+            sql.bind(TYPE, message.getType().getNumber());
+            sql.bind(RELAY, message.getRelay());
+            sql.bind(TIMESTAMP, message.getTimestamp());
+            sql.bind(SOURCE, message.getSource());
+            sql.bind(SOURCE_DEVICE, message.getSourceDevice());
+            sql.bind(MESSAGE, message.hasLegacyMessage() ? message.getLegacyMessage().toByteArray() : null);
+            sql.bind(CONTENT, message.hasContent() ? message.getContent().toByteArray() : null);
+          }
+        };
+      }
+    }
+  }
+
+
+}

src/main/java/org/whispersystems/textsecuregcm/storage/MessagesManager.java

@@ -0,0 +1,37 @@
+package org.whispersystems.textsecuregcm.storage;
+
+
+import com.google.common.base.Optional;
+import org.whispersystems.textsecuregcm.entities.MessageProtos.Envelope;
+import org.whispersystems.textsecuregcm.entities.OutgoingMessageEntity;
+
+import java.util.List;
+
+public class MessagesManager {
+
+  private final Messages messages;
+
+  public MessagesManager(Messages messages) {
+    this.messages = messages;
+  }
+
+  public int insert(String destination, long destinationDevice, Envelope message) {
+    return this.messages.store(message, destination, destinationDevice) + 1;
+  }
+
+  public List<OutgoingMessageEntity> getMessagesForDevice(String destination, long destinationDevice) {
+    return this.messages.load(destination, destinationDevice);
+  }
+
+  public void clear(String destination) {
+    this.messages.clear(destination);
+  }
+
+  public Optional<OutgoingMessageEntity> delete(String destination, String source, long timestamp) {
+    return Optional.fromNullable(this.messages.remove(destination, source, timestamp));
+  }
+
+  public void delete(String destination, long id) {
+    this.messages.remove(destination, id);
+  }
+}

src/main/java/org/whispersystems/textsecuregcm/storage/PendingAccountsManager.java

@@ -17,20 +17,21 @@
 package org.whispersystems.textsecuregcm.storage;
 
 import com.google.common.base.Optional;
-import net.spy.memcached.MemcachedClient;
+
+import redis.clients.jedis.Jedis;
+import redis.clients.jedis.JedisPool;
 
 public class PendingAccountsManager {
 
-  private static final String MEMCACHE_PREFIX = "pending_account";
+  private static final String CACHE_PREFIX = "pending_account::";
 
   private final PendingAccounts pendingAccounts;
-  private final MemcachedClient memcachedClient;
+  private final JedisPool       cacheClient;
 
-  public PendingAccountsManager(PendingAccounts pendingAccounts,
-                                MemcachedClient memcachedClient)
+  public PendingAccountsManager(PendingAccounts pendingAccounts, JedisPool cacheClient)
   {
     this.pendingAccounts = pendingAccounts;
-    this.memcachedClient = memcachedClient;
+    this.cacheClient     = cacheClient;
   }
 
   public void store(String number, String code) {
@@ -58,22 +59,20 @@ public class PendingAccountsManager {
   }
 
   private void memcacheSet(String number, String code) {
-    if (memcachedClient != null) {
-      memcachedClient.set(MEMCACHE_PREFIX + number, 0, code);
+    try (Jedis jedis = cacheClient.getResource()) {
+      jedis.set(CACHE_PREFIX + number, code);
     }
   }
 
   private Optional<String> memcacheGet(String number) {
-    if (memcachedClient != null) {
-      return Optional.fromNullable((String)memcachedClient.get(MEMCACHE_PREFIX + number));
-    } else {
-      return Optional.absent();
+    try (Jedis jedis = cacheClient.getResource()) {
+      return Optional.fromNullable(jedis.get(CACHE_PREFIX + number));
     }
   }
 
   private void memcacheDelete(String number) {
-    if (memcachedClient != null) {
-      memcachedClient.delete(MEMCACHE_PREFIX + number);
+    try (Jedis jedis = cacheClient.getResource()) {
+      jedis.del(CACHE_PREFIX + number);
     }
   }
 }

src/main/java/org/whispersystems/textsecuregcm/storage/PendingDevicesManager.java

@@ -17,20 +17,22 @@
 package org.whispersystems.textsecuregcm.storage;
 
 import com.google.common.base.Optional;
-import net.spy.memcached.MemcachedClient;
+
+import redis.clients.jedis.Jedis;
+import redis.clients.jedis.JedisPool;
 
 public class PendingDevicesManager {
 
-  private static final String MEMCACHE_PREFIX = "pending_devices";
+  private static final String CACHE_PREFIX = "pending_devices::";
 
   private final PendingDevices  pendingDevices;
-  private final MemcachedClient memcachedClient;
+  private final JedisPool       cacheClient;
 
   public PendingDevicesManager(PendingDevices pendingDevices,
-                               MemcachedClient memcachedClient)
+                               JedisPool      cacheClient)
   {
-    this.pendingDevices  = pendingDevices;
-    this.memcachedClient = memcachedClient;
+    this.pendingDevices = pendingDevices;
+    this.cacheClient    = cacheClient;
   }
 
   public void store(String number, String code) {
@@ -58,22 +60,20 @@ public class PendingDevicesManager {
   }
 
   private void memcacheSet(String number, String code) {
-    if (memcachedClient != null) {
-      memcachedClient.set(MEMCACHE_PREFIX + number, 0, code);
+    try (Jedis jedis = cacheClient.getResource()) {
+      jedis.set(CACHE_PREFIX + number, code);
     }
   }
 
   private Optional<String> memcacheGet(String number) {
-    if (memcachedClient != null) {
-      return Optional.fromNullable((String)memcachedClient.get(MEMCACHE_PREFIX + number));
-    } else {
-      return Optional.absent();
+    try (Jedis jedis = cacheClient.getResource()) {
+      return Optional.fromNullable(jedis.get(CACHE_PREFIX + number));
     }
   }
 
   private void memcacheDelete(String number) {
-    if (memcachedClient != null) {
-      memcachedClient.delete(MEMCACHE_PREFIX + number);
+    try (Jedis jedis = cacheClient.getResource()) {
+      jedis.del(CACHE_PREFIX + number);
     }
   }
 

src/main/java/org/whispersystems/textsecuregcm/storage/PubSubListener.java

@@ -1,7 +0,0 @@
-package org.whispersystems.textsecuregcm.storage;
-
-public interface PubSubListener {
-
-  public void onPubSubMessage(PubSubMessage outgoingMessage);
-
-}

src/main/java/org/whispersystems/textsecuregcm/storage/PubSubManager.java

@@ -1,141 +1,87 @@
 package org.whispersystems.textsecuregcm.storage;
 
-import com.fasterxml.jackson.core.JsonProcessingException;
-import com.fasterxml.jackson.databind.ObjectMapper;
+import com.google.protobuf.ByteString;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
-import org.whispersystems.textsecuregcm.util.SystemMapper;
-import org.whispersystems.textsecuregcm.websocket.InvalidWebsocketAddressException;
+import org.whispersystems.dispatch.DispatchChannel;
+import org.whispersystems.dispatch.DispatchManager;
 import org.whispersystems.textsecuregcm.websocket.WebsocketAddress;
 
-import java.io.IOException;
-import java.util.HashMap;
-import java.util.Map;
+import java.util.concurrent.atomic.AtomicInteger;
 
+import io.dropwizard.lifecycle.Managed;
+import static org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage;
 import redis.clients.jedis.Jedis;
 import redis.clients.jedis.JedisPool;
-import redis.clients.jedis.JedisPubSub;
 
-public class PubSubManager {
+public class PubSubManager implements Managed {
 
   private static final String KEEPALIVE_CHANNEL = "KEEPALIVE";
 
-  private final Logger                      logger       = LoggerFactory.getLogger(PubSubManager.class);
-  private final ObjectMapper                mapper       = SystemMapper.getMapper();
-  private final SubscriptionListener        baseListener = new SubscriptionListener();
-  private final Map<String, PubSubListener> listeners    = new HashMap<>();
+  private final Logger logger = LoggerFactory.getLogger(PubSubManager.class);
+
+  private final DispatchManager dispatchManager;
+  private final JedisPool         jedisPool;
 
-  private final JedisPool jedisPool;
   private boolean subscribed = false;
 
-  public PubSubManager(final JedisPool jedisPool) {
-    this.jedisPool = jedisPool;
-    initializePubSubWorker();
-    waitForSubscription();
+  public PubSubManager(JedisPool jedisPool, DispatchManager dispatchManager) {
+    this.dispatchManager = dispatchManager;
+    this.jedisPool         = jedisPool;
   }
 
-  public synchronized void subscribe(WebsocketAddress address, PubSubListener listener) {
-    listeners.put(address.serialize(), listener);
-    baseListener.subscribe(address.serialize());
+  @Override
+  public void start() throws Exception {
+    this.dispatchManager.start();
+
+    KeepaliveDispatchChannel keepaliveDispatchChannel = new KeepaliveDispatchChannel();
+    this.dispatchManager.subscribe(KEEPALIVE_CHANNEL, keepaliveDispatchChannel);
+
+    synchronized (this) {
+      while (!subscribed) wait(0);
+    }
+
+    new KeepaliveSender().start();
   }
 
-  public synchronized void unsubscribe(WebsocketAddress address, PubSubListener listener) {
-    if (listeners.get(address.serialize()) == listener) {
-      listeners.remove(address.serialize());
-      baseListener.unsubscribe(address.serialize());
+  @Override
+  public void stop() throws Exception {
+    dispatchManager.shutdown();
+  }
+
+  public void subscribe(WebsocketAddress address, DispatchChannel channel) {
+    String serializedAddress = address.serialize();
+    dispatchManager.subscribe(serializedAddress, channel);
+  }
+
+  public void unsubscribe(WebsocketAddress address, DispatchChannel dispatchChannel) {
+    String serializedAddress = address.serialize();
+    dispatchManager.unsubscribe(serializedAddress, dispatchChannel);
+  }
+
+  public boolean hasLocalSubscription(WebsocketAddress address) {
+    return dispatchManager.hasSubscription(address.serialize());
+  }
+
+  public boolean publish(WebsocketAddress address, PubSubMessage message) {
+    return publish(address.serialize().getBytes(), message);
+  }
+
+  private boolean publish(byte[] channel, PubSubMessage message) {
+    try (Jedis jedis = jedisPool.getResource()) {
+      return jedis.publish(channel, message.toByteArray()) != 0;
     }
   }
 
-  public synchronized boolean publish(WebsocketAddress address, PubSubMessage message) {
-    return publish(address.serialize(), message);
-  }
-
-  private synchronized boolean publish(String channel, PubSubMessage message) {
-    try {
-      String serialized = mapper.writeValueAsString(message);
-      Jedis  jedis      = null;
-
-      try {
-        jedis = jedisPool.getResource();
-        return jedis.publish(channel, serialized) != 0;
-      } finally {
-        if (jedis != null)
-          jedisPool.returnResource(jedis);
-      }
-    } catch (JsonProcessingException e) {
-      throw new AssertionError(e);
-    }
-  }
-
-  private synchronized void waitForSubscription() {
-    try {
-      while (!subscribed) {
-        wait();
-      }
-    } catch (InterruptedException e) {
-      throw new AssertionError(e);
-    }
-  }
-
-  private void initializePubSubWorker() {
-    new Thread("PubSubListener") {
-      @Override
-      public void run() {
-        for (;;) {
-          Jedis jedis = null;
-          try {
-            jedis = jedisPool.getResource();
-            jedis.subscribe(baseListener, KEEPALIVE_CHANNEL);
-            logger.warn("**** Unsubscribed from holding channel!!! ******");
-          } finally {
-            if (jedis != null)
-              jedisPool.returnResource(jedis);
-          }
-        }
-      }
-    }.start();
-
-    new Thread("PubSubKeepAlive") {
-      @Override
-      public void run() {
-        for (;;) {
-          try {
-            Thread.sleep(20000);
-            publish(KEEPALIVE_CHANNEL, new PubSubMessage(0, "foo"));
-          } catch (InterruptedException e) {
-            throw new AssertionError(e);
-          }
-        }
-      }
-    }.start();
-  }
-
-  private class SubscriptionListener extends JedisPubSub {
+  private class KeepaliveDispatchChannel implements DispatchChannel {
 
     @Override
-    public void onMessage(String channel, String message) {
-      try {
-        PubSubListener   listener;
-
-        synchronized (PubSubManager.this) {
-          listener = listeners.get(channel);
-        }
-
-        if (listener != null) {
-          listener.onPubSubMessage(mapper.readValue(message, PubSubMessage.class));
-        }
-      } catch (IOException e) {
-        logger.warn("IOE", e);
-      }
+    public void onDispatchMessage(String channel, byte[] message) {
+      // Good
     }
 
     @Override
-    public void onPMessage(String s, String s2, String s3) {
-      logger.warn("Received PMessage!");
-    }
-
-    @Override
-    public void onSubscribe(String channel, int count) {
+    public void onDispatchSubscribed(String channel) {
       if (KEEPALIVE_CHANNEL.equals(channel)) {
         synchronized (PubSubManager.this) {
           subscribed = true;
@@ -145,12 +91,24 @@ public class PubSubManager {
     }
 
     @Override
-    public void onUnsubscribe(String s, int i) {}
+    public void onDispatchUnsubscribed(String channel) {
+      logger.warn("***** KEEPALIVE CHANNEL UNSUBSCRIBED *****");
+    }
+  }
 
+  private class KeepaliveSender extends Thread {
     @Override
-    public void onPUnsubscribe(String s, int i) {}
-
-    @Override
-    public void onPSubscribe(String s, int i) {}
+    public void run() {
+      while (true) {
+        try {
+          Thread.sleep(20000);
+          publish(KEEPALIVE_CHANNEL.getBytes(), PubSubMessage.newBuilder()
+                                                             .setType(PubSubMessage.Type.KEEPALIVE)
+                                                             .build());
+        } catch (Throwable e) {
+          logger.warn("***** KEEPALIVE EXCEPTION ******", e);
+        }
+      }
+    }
   }
 }

src/main/java/org/whispersystems/textsecuregcm/storage/PubSubMessage.java

@@ -1,32 +0,0 @@
-package org.whispersystems.textsecuregcm.storage;
-
-import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
-import com.fasterxml.jackson.annotation.JsonProperty;
-
-@JsonIgnoreProperties(ignoreUnknown = true)
-public class PubSubMessage {
-
-  public static final int TYPE_QUERY_DB = 1;
-  public static final int TYPE_DELIVER  = 2;
-
-  @JsonProperty
-  private int type;
-
-  @JsonProperty
-  private String contents;
-
-  public PubSubMessage() {}
-
-  public PubSubMessage(int type, String contents) {
-    this.type     = type;
-    this.contents = contents;
-  }
-
-  public int getType() {
-    return type;
-  }
-
-  public String getContents() {
-    return contents;
-  }
-}

src/main/java/org/whispersystems/textsecuregcm/storage/PubSubProtos.java

@@ -0,0 +1,652 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: PubSubMessage.proto
+
+package org.whispersystems.textsecuregcm.storage;
+
+public final class PubSubProtos {
+  private PubSubProtos() {}
+  public static void registerAllExtensions(
+      com.google.protobuf.ExtensionRegistry registry) {
+  }
+  public interface PubSubMessageOrBuilder
+      extends com.google.protobuf.MessageOrBuilder {
+
+    // optional .textsecure.PubSubMessage.Type type = 1;
+    /**
+     * <code>optional .textsecure.PubSubMessage.Type type = 1;</code>
+     */
+    boolean hasType();
+    /**
+     * <code>optional .textsecure.PubSubMessage.Type type = 1;</code>
+     */
+    org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage.Type getType();
+
+    // optional bytes content = 2;
+    /**
+     * <code>optional bytes content = 2;</code>
+     */
+    boolean hasContent();
+    /**
+     * <code>optional bytes content = 2;</code>
+     */
+    com.google.protobuf.ByteString getContent();
+  }
+  /**
+   * Protobuf type {@code textsecure.PubSubMessage}
+   */
+  public static final class PubSubMessage extends
+      com.google.protobuf.GeneratedMessage
+      implements PubSubMessageOrBuilder {
+    // Use PubSubMessage.newBuilder() to construct.
+    private PubSubMessage(com.google.protobuf.GeneratedMessage.Builder<?> builder) {
+      super(builder);
+      this.unknownFields = builder.getUnknownFields();
+    }
+    private PubSubMessage(boolean noInit) { this.unknownFields = com.google.protobuf.UnknownFieldSet.getDefaultInstance(); }
+
+    private static final PubSubMessage defaultInstance;
+    public static PubSubMessage getDefaultInstance() {
+      return defaultInstance;
+    }
+
+    public PubSubMessage getDefaultInstanceForType() {
+      return defaultInstance;
+    }
+
+    private final com.google.protobuf.UnknownFieldSet unknownFields;
+    @java.lang.Override
+    public final com.google.protobuf.UnknownFieldSet
+        getUnknownFields() {
+      return this.unknownFields;
+    }
+    private PubSubMessage(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      initFields();
+      int mutable_bitField0_ = 0;
+      com.google.protobuf.UnknownFieldSet.Builder unknownFields =
+          com.google.protobuf.UnknownFieldSet.newBuilder();
+      try {
+        boolean done = false;
+        while (!done) {
+          int tag = input.readTag();
+          switch (tag) {
+            case 0:
+              done = true;
+              break;
+            default: {
+              if (!parseUnknownField(input, unknownFields,
+                                     extensionRegistry, tag)) {
+                done = true;
+              }
+              break;
+            }
+            case 8: {
+              int rawValue = input.readEnum();
+              org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage.Type value = org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage.Type.valueOf(rawValue);
+              if (value == null) {
+                unknownFields.mergeVarintField(1, rawValue);
+              } else {
+                bitField0_ |= 0x00000001;
+                type_ = value;
+              }
+              break;
+            }
+            case 18: {
+              bitField0_ |= 0x00000002;
+              content_ = input.readBytes();
+              break;
+            }
+          }
+        }
+      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+        throw e.setUnfinishedMessage(this);
+      } catch (java.io.IOException e) {
+        throw new com.google.protobuf.InvalidProtocolBufferException(
+            e.getMessage()).setUnfinishedMessage(this);
+      } finally {
+        this.unknownFields = unknownFields.build();
+        makeExtensionsImmutable();
+      }
+    }
+    public static final com.google.protobuf.Descriptors.Descriptor
+        getDescriptor() {
+      return org.whispersystems.textsecuregcm.storage.PubSubProtos.internal_static_textsecure_PubSubMessage_descriptor;
+    }
+
+    protected com.google.protobuf.GeneratedMessage.FieldAccessorTable
+        internalGetFieldAccessorTable() {
+      return org.whispersystems.textsecuregcm.storage.PubSubProtos.internal_static_textsecure_PubSubMessage_fieldAccessorTable
+          .ensureFieldAccessorsInitialized(
+              org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage.class, org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage.Builder.class);
+    }
+
+    public static com.google.protobuf.Parser<PubSubMessage> PARSER =
+        new com.google.protobuf.AbstractParser<PubSubMessage>() {
+      public PubSubMessage parsePartialFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws com.google.protobuf.InvalidProtocolBufferException {
+        return new PubSubMessage(input, extensionRegistry);
+      }
+    };
+
+    @java.lang.Override
+    public com.google.protobuf.Parser<PubSubMessage> getParserForType() {
+      return PARSER;
+    }
+
+    /**
+     * Protobuf enum {@code textsecure.PubSubMessage.Type}
+     */
+    public enum Type
+        implements com.google.protobuf.ProtocolMessageEnum {
+      /**
+       * <code>UNKNOWN = 0;</code>
+       */
+      UNKNOWN(0, 0),
+      /**
+       * <code>QUERY_DB = 1;</code>
+       */
+      QUERY_DB(1, 1),
+      /**
+       * <code>DELIVER = 2;</code>
+       */
+      DELIVER(2, 2),
+      /**
+       * <code>KEEPALIVE = 3;</code>
+       */
+      KEEPALIVE(3, 3),
+      /**
+       * <code>CLOSE = 4;</code>
+       */
+      CLOSE(4, 4),
+      ;
+
+      /**
+       * <code>UNKNOWN = 0;</code>
+       */
+      public static final int UNKNOWN_VALUE = 0;
+      /**
+       * <code>QUERY_DB = 1;</code>
+       */
+      public static final int QUERY_DB_VALUE = 1;
+      /**
+       * <code>DELIVER = 2;</code>
+       */
+      public static final int DELIVER_VALUE = 2;
+      /**
+       * <code>KEEPALIVE = 3;</code>
+       */
+      public static final int KEEPALIVE_VALUE = 3;
+      /**
+       * <code>CLOSE = 4;</code>
+       */
+      public static final int CLOSE_VALUE = 4;
+
+
+      public final int getNumber() { return value; }
+
+      public static Type valueOf(int value) {
+        switch (value) {
+          case 0: return UNKNOWN;
+          case 1: return QUERY_DB;
+          case 2: return DELIVER;
+          case 3: return KEEPALIVE;
+          case 4: return CLOSE;
+          default: return null;
+        }
+      }
+
+      public static com.google.protobuf.Internal.EnumLiteMap<Type>
+          internalGetValueMap() {
+        return internalValueMap;
+      }
+      private static com.google.protobuf.Internal.EnumLiteMap<Type>
+          internalValueMap =
+            new com.google.protobuf.Internal.EnumLiteMap<Type>() {
+              public Type findValueByNumber(int number) {
+                return Type.valueOf(number);
+              }
+            };
+
+      public final com.google.protobuf.Descriptors.EnumValueDescriptor
+          getValueDescriptor() {
+        return getDescriptor().getValues().get(index);
+      }
+      public final com.google.protobuf.Descriptors.EnumDescriptor
+          getDescriptorForType() {
+        return getDescriptor();
+      }
+      public static final com.google.protobuf.Descriptors.EnumDescriptor
+          getDescriptor() {
+        return org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage.getDescriptor().getEnumTypes().get(0);
+      }
+
+      private static final Type[] VALUES = values();
+
+      public static Type valueOf(
+          com.google.protobuf.Descriptors.EnumValueDescriptor desc) {
+        if (desc.getType() != getDescriptor()) {
+          throw new java.lang.IllegalArgumentException(
+            "EnumValueDescriptor is not for this type.");
+        }
+        return VALUES[desc.getIndex()];
+      }
+
+      private final int index;
+      private final int value;
+
+      private Type(int index, int value) {
+        this.index = index;
+        this.value = value;
+      }
+
+      // @@protoc_insertion_point(enum_scope:textsecure.PubSubMessage.Type)
+    }
+
+    private int bitField0_;
+    // optional .textsecure.PubSubMessage.Type type = 1;
+    public static final int TYPE_FIELD_NUMBER = 1;
+    private org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage.Type type_;
+    /**
+     * <code>optional .textsecure.PubSubMessage.Type type = 1;</code>
+     */
+    public boolean hasType() {
+      return ((bitField0_ & 0x00000001) == 0x00000001);
+    }
+    /**
+     * <code>optional .textsecure.PubSubMessage.Type type = 1;</code>
+     */
+    public org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage.Type getType() {
+      return type_;
+    }
+
+    // optional bytes content = 2;
+    public static final int CONTENT_FIELD_NUMBER = 2;
+    private com.google.protobuf.ByteString content_;
+    /**
+     * <code>optional bytes content = 2;</code>
+     */
+    public boolean hasContent() {
+      return ((bitField0_ & 0x00000002) == 0x00000002);
+    }
+    /**
+     * <code>optional bytes content = 2;</code>
+     */
+    public com.google.protobuf.ByteString getContent() {
+      return content_;
+    }
+
+    private void initFields() {
+      type_ = org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage.Type.UNKNOWN;
+      content_ = com.google.protobuf.ByteString.EMPTY;
+    }
+    private byte memoizedIsInitialized = -1;
+    public final boolean isInitialized() {
+      byte isInitialized = memoizedIsInitialized;
+      if (isInitialized != -1) return isInitialized == 1;
+
+      memoizedIsInitialized = 1;
+      return true;
+    }
+
+    public void writeTo(com.google.protobuf.CodedOutputStream output)
+                        throws java.io.IOException {
+      getSerializedSize();
+      if (((bitField0_ & 0x00000001) == 0x00000001)) {
+        output.writeEnum(1, type_.getNumber());
+      }
+      if (((bitField0_ & 0x00000002) == 0x00000002)) {
+        output.writeBytes(2, content_);
+      }
+      getUnknownFields().writeTo(output);
+    }
+
+    private int memoizedSerializedSize = -1;
+    public int getSerializedSize() {
+      int size = memoizedSerializedSize;
+      if (size != -1) return size;
+
+      size = 0;
+      if (((bitField0_ & 0x00000001) == 0x00000001)) {
+        size += com.google.protobuf.CodedOutputStream
+          .computeEnumSize(1, type_.getNumber());
+      }
+      if (((bitField0_ & 0x00000002) == 0x00000002)) {
+        size += com.google.protobuf.CodedOutputStream
+          .computeBytesSize(2, content_);
+      }
+      size += getUnknownFields().getSerializedSize();
+      memoizedSerializedSize = size;
+      return size;
+    }
+
+    private static final long serialVersionUID = 0L;
+    @java.lang.Override
+    protected java.lang.Object writeReplace()
+        throws java.io.ObjectStreamException {
+      return super.writeReplace();
+    }
+
+    public static org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage parseFrom(
+        com.google.protobuf.ByteString data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+    public static org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage parseFrom(
+        com.google.protobuf.ByteString data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+    public static org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage parseFrom(byte[] data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+    public static org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage parseFrom(
+        byte[] data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+    public static org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage parseFrom(java.io.InputStream input)
+        throws java.io.IOException {
+      return PARSER.parseFrom(input);
+    }
+    public static org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage parseFrom(
+        java.io.InputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return PARSER.parseFrom(input, extensionRegistry);
+    }
+    public static org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage parseDelimitedFrom(java.io.InputStream input)
+        throws java.io.IOException {
+      return PARSER.parseDelimitedFrom(input);
+    }
+    public static org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage parseDelimitedFrom(
+        java.io.InputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return PARSER.parseDelimitedFrom(input, extensionRegistry);
+    }
+    public static org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage parseFrom(
+        com.google.protobuf.CodedInputStream input)
+        throws java.io.IOException {
+      return PARSER.parseFrom(input);
+    }
+    public static org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage parseFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return PARSER.parseFrom(input, extensionRegistry);
+    }
+
+    public static Builder newBuilder() { return Builder.create(); }
+    public Builder newBuilderForType() { return newBuilder(); }
+    public static Builder newBuilder(org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage prototype) {
+      return newBuilder().mergeFrom(prototype);
+    }
+    public Builder toBuilder() { return newBuilder(this); }
+
+    @java.lang.Override
+    protected Builder newBuilderForType(
+        com.google.protobuf.GeneratedMessage.BuilderParent parent) {
+      Builder builder = new Builder(parent);
+      return builder;
+    }
+    /**
+     * Protobuf type {@code textsecure.PubSubMessage}
+     */
+    public static final class Builder extends
+        com.google.protobuf.GeneratedMessage.Builder<Builder>
+       implements org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessageOrBuilder {
+      public static final com.google.protobuf.Descriptors.Descriptor
+          getDescriptor() {
+        return org.whispersystems.textsecuregcm.storage.PubSubProtos.internal_static_textsecure_PubSubMessage_descriptor;
+      }
+
+      protected com.google.protobuf.GeneratedMessage.FieldAccessorTable
+          internalGetFieldAccessorTable() {
+        return org.whispersystems.textsecuregcm.storage.PubSubProtos.internal_static_textsecure_PubSubMessage_fieldAccessorTable
+            .ensureFieldAccessorsInitialized(
+                org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage.class, org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage.Builder.class);
+      }
+
+      // Construct using org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage.newBuilder()
+      private Builder() {
+        maybeForceBuilderInitialization();
+      }
+
+      private Builder(
+          com.google.protobuf.GeneratedMessage.BuilderParent parent) {
+        super(parent);
+        maybeForceBuilderInitialization();
+      }
+      private void maybeForceBuilderInitialization() {
+        if (com.google.protobuf.GeneratedMessage.alwaysUseFieldBuilders) {
+        }
+      }
+      private static Builder create() {
+        return new Builder();
+      }
+
+      public Builder clear() {
+        super.clear();
+        type_ = org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage.Type.UNKNOWN;
+        bitField0_ = (bitField0_ & ~0x00000001);
+        content_ = com.google.protobuf.ByteString.EMPTY;
+        bitField0_ = (bitField0_ & ~0x00000002);
+        return this;
+      }
+
+      public Builder clone() {
+        return create().mergeFrom(buildPartial());
+      }
+
+      public com.google.protobuf.Descriptors.Descriptor
+          getDescriptorForType() {
+        return org.whispersystems.textsecuregcm.storage.PubSubProtos.internal_static_textsecure_PubSubMessage_descriptor;
+      }
+
+      public org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage getDefaultInstanceForType() {
+        return org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage.getDefaultInstance();
+      }
+
+      public org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage build() {
+        org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage result = buildPartial();
+        if (!result.isInitialized()) {
+          throw newUninitializedMessageException(result);
+        }
+        return result;
+      }
+
+      public org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage buildPartial() {
+        org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage result = new org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage(this);
+        int from_bitField0_ = bitField0_;
+        int to_bitField0_ = 0;
+        if (((from_bitField0_ & 0x00000001) == 0x00000001)) {
+          to_bitField0_ |= 0x00000001;
+        }
+        result.type_ = type_;
+        if (((from_bitField0_ & 0x00000002) == 0x00000002)) {
+          to_bitField0_ |= 0x00000002;
+        }
+        result.content_ = content_;
+        result.bitField0_ = to_bitField0_;
+        onBuilt();
+        return result;
+      }
+
+      public Builder mergeFrom(com.google.protobuf.Message other) {
+        if (other instanceof org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage) {
+          return mergeFrom((org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage)other);
+        } else {
+          super.mergeFrom(other);
+          return this;
+        }
+      }
+
+      public Builder mergeFrom(org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage other) {
+        if (other == org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage.getDefaultInstance()) return this;
+        if (other.hasType()) {
+          setType(other.getType());
+        }
+        if (other.hasContent()) {
+          setContent(other.getContent());
+        }
+        this.mergeUnknownFields(other.getUnknownFields());
+        return this;
+      }
+
+      public final boolean isInitialized() {
+        return true;
+      }
+
+      public Builder mergeFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws java.io.IOException {
+        org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage parsedMessage = null;
+        try {
+          parsedMessage = PARSER.parsePartialFrom(input, extensionRegistry);
+        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+          parsedMessage = (org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage) e.getUnfinishedMessage();
+          throw e;
+        } finally {
+          if (parsedMessage != null) {
+            mergeFrom(parsedMessage);
+          }
+        }
+        return this;
+      }
+      private int bitField0_;
+
+      // optional .textsecure.PubSubMessage.Type type = 1;
+      private org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage.Type type_ = org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage.Type.UNKNOWN;
+      /**
+       * <code>optional .textsecure.PubSubMessage.Type type = 1;</code>
+       */
+      public boolean hasType() {
+        return ((bitField0_ & 0x00000001) == 0x00000001);
+      }
+      /**
+       * <code>optional .textsecure.PubSubMessage.Type type = 1;</code>
+       */
+      public org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage.Type getType() {
+        return type_;
+      }
+      /**
+       * <code>optional .textsecure.PubSubMessage.Type type = 1;</code>
+       */
+      public Builder setType(org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage.Type value) {
+        if (value == null) {
+          throw new NullPointerException();
+        }
+        bitField0_ |= 0x00000001;
+        type_ = value;
+        onChanged();
+        return this;
+      }
+      /**
+       * <code>optional .textsecure.PubSubMessage.Type type = 1;</code>
+       */
+      public Builder clearType() {
+        bitField0_ = (bitField0_ & ~0x00000001);
+        type_ = org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage.Type.UNKNOWN;
+        onChanged();
+        return this;
+      }
+
+      // optional bytes content = 2;
+      private com.google.protobuf.ByteString content_ = com.google.protobuf.ByteString.EMPTY;
+      /**
+       * <code>optional bytes content = 2;</code>
+       */
+      public boolean hasContent() {
+        return ((bitField0_ & 0x00000002) == 0x00000002);
+      }
+      /**
+       * <code>optional bytes content = 2;</code>
+       */
+      public com.google.protobuf.ByteString getContent() {
+        return content_;
+      }
+      /**
+       * <code>optional bytes content = 2;</code>
+       */
+      public Builder setContent(com.google.protobuf.ByteString value) {
+        if (value == null) {
+    throw new NullPointerException();
+  }
+  bitField0_ |= 0x00000002;
+        content_ = value;
+        onChanged();
+        return this;
+      }
+      /**
+       * <code>optional bytes content = 2;</code>
+       */
+      public Builder clearContent() {
+        bitField0_ = (bitField0_ & ~0x00000002);
+        content_ = getDefaultInstance().getContent();
+        onChanged();
+        return this;
+      }
+
+      // @@protoc_insertion_point(builder_scope:textsecure.PubSubMessage)
+    }
+
+    static {
+      defaultInstance = new PubSubMessage(true);
+      defaultInstance.initFields();
+    }
+
+    // @@protoc_insertion_point(class_scope:textsecure.PubSubMessage)
+  }
+
+  private static com.google.protobuf.Descriptors.Descriptor
+    internal_static_textsecure_PubSubMessage_descriptor;
+  private static
+    com.google.protobuf.GeneratedMessage.FieldAccessorTable
+      internal_static_textsecure_PubSubMessage_fieldAccessorTable;
+
+  public static com.google.protobuf.Descriptors.FileDescriptor
+      getDescriptor() {
+    return descriptor;
+  }
+  private static com.google.protobuf.Descriptors.FileDescriptor
+      descriptor;
+  static {
+    java.lang.String[] descriptorData = {
+      "\n\023PubSubMessage.proto\022\ntextsecure\"\230\001\n\rPu" +
+      "bSubMessage\022,\n\004type\030\001 \001(\0162\036.textsecure.P" +
+      "ubSubMessage.Type\022\017\n\007content\030\002 \001(\014\"H\n\004Ty" +
+      "pe\022\013\n\007UNKNOWN\020\000\022\014\n\010QUERY_DB\020\001\022\013\n\007DELIVER" +
+      "\020\002\022\r\n\tKEEPALIVE\020\003\022\t\n\005CLOSE\020\004B8\n(org.whis" +
+      "persystems.textsecuregcm.storageB\014PubSub" +
+      "Protos"
+    };
+    com.google.protobuf.Descriptors.FileDescriptor.InternalDescriptorAssigner assigner =
+      new com.google.protobuf.Descriptors.FileDescriptor.InternalDescriptorAssigner() {
+        public com.google.protobuf.ExtensionRegistry assignDescriptors(
+            com.google.protobuf.Descriptors.FileDescriptor root) {
+          descriptor = root;
+          internal_static_textsecure_PubSubMessage_descriptor =
+            getDescriptor().getMessageTypes().get(0);
+          internal_static_textsecure_PubSubMessage_fieldAccessorTable = new
+            com.google.protobuf.GeneratedMessage.FieldAccessorTable(
+              internal_static_textsecure_PubSubMessage_descriptor,
+              new java.lang.String[] { "Type", "Content", });
+          return null;
+        }
+      };
+    com.google.protobuf.Descriptors.FileDescriptor
+      .internalBuildGeneratedFileFrom(descriptorData,
+        new com.google.protobuf.Descriptors.FileDescriptor[] {
+        }, assigner);
+  }
+
+  // @@protoc_insertion_point(outer_class_scope)
+}

src/main/java/org/whispersystems/textsecuregcm/storage/StoredMessages.java

@@ -1,118 +0,0 @@
-/**
- * Copyright (C) 2014 Open WhisperSystems
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU Affero General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-package org.whispersystems.textsecuregcm.storage;
-
-import com.codahale.metrics.Histogram;
-import com.codahale.metrics.MetricRegistry;
-import com.codahale.metrics.SharedMetricRegistries;
-import com.fasterxml.jackson.core.JsonProcessingException;
-import com.fasterxml.jackson.databind.ObjectMapper;
-
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-import org.whispersystems.textsecuregcm.entities.PendingMessage;
-import org.whispersystems.textsecuregcm.util.Constants;
-import org.whispersystems.textsecuregcm.util.SystemMapper;
-import org.whispersystems.textsecuregcm.websocket.WebsocketAddress;
-
-import java.io.IOException;
-import java.util.LinkedList;
-import java.util.List;
-
-import static com.codahale.metrics.MetricRegistry.name;
-import redis.clients.jedis.Jedis;
-import redis.clients.jedis.JedisPool;
-
-public class StoredMessages {
-
-  private static final Logger logger = LoggerFactory.getLogger(StoredMessages.class);
-
-  private final MetricRegistry metricRegistry     = SharedMetricRegistries.getOrCreate(Constants.METRICS_NAME);
-  private final Histogram      queueSizeHistogram = metricRegistry.histogram(name(getClass(), "queue_size"));
-
-
-  private static final ObjectMapper mapper = SystemMapper.getMapper();
-  private static final String QUEUE_PREFIX = "msgs";
-
-  private final JedisPool jedisPool;
-
-  public StoredMessages(JedisPool jedisPool) {
-    this.jedisPool = jedisPool;
-  }
-
-  public void clear(WebsocketAddress address) {
-    Jedis jedis = null;
-
-    try {
-      jedis = jedisPool.getResource();
-      jedis.del(getKey(address));
-    } finally {
-      if (jedis != null)
-        jedisPool.returnResource(jedis);
-    }
-  }
-
-  public void insert(WebsocketAddress address, PendingMessage message) {
-    Jedis jedis = null;
-
-    try {
-      jedis = jedisPool.getResource();
-
-      String serializedMessage = mapper.writeValueAsString(message);
-      long   queueSize         = jedis.lpush(getKey(address), serializedMessage);
-      queueSizeHistogram.update(queueSize);
-
-      if (queueSize > 1000) {
-        jedis.ltrim(getKey(address), 0, 999);
-      }
-
-    } catch (JsonProcessingException e) {
-      logger.warn("StoredMessages", "Unable to store correctly", e);
-    } finally {
-      if (jedis != null)
-        jedisPool.returnResource(jedis);
-    }
-  }
-
-  public List<PendingMessage> getMessagesForDevice(WebsocketAddress address) {
-    List<PendingMessage> messages = new LinkedList<>();
-    Jedis                jedis    = null;
-
-    try {
-      jedis = jedisPool.getResource();
-      String message;
-
-      while ((message = jedis.rpop(getKey(address))) != null) {
-        try {
-          messages.add(mapper.readValue(message, PendingMessage.class));
-        } catch (IOException e) {
-          logger.warn("StoredMessages", "Not a valid PendingMessage", e);
-        }
-      }
-
-      return messages;
-    } finally {
-      if (jedis != null)
-        jedisPool.returnResource(jedis);
-    }
-  }
-
-  private String getKey(WebsocketAddress address) {
-    return QUEUE_PREFIX + ":" + address.serialize();
-  }
-
-}

src/main/java/org/whispersystems/textsecuregcm/util/SystemMapper.java

@@ -2,6 +2,7 @@ package org.whispersystems.textsecuregcm.util;
 
 import com.fasterxml.jackson.annotation.JsonAutoDetect;
 import com.fasterxml.jackson.annotation.PropertyAccessor;
+import com.fasterxml.jackson.databind.DeserializationFeature;
 import com.fasterxml.jackson.databind.ObjectMapper;
 
 public class SystemMapper {
@@ -11,6 +12,7 @@ public class SystemMapper {
   static {
     mapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.NONE);
     mapper.setVisibility(PropertyAccessor.FIELD, JsonAutoDetect.Visibility.ANY);
+    mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
   }
 
   public static ObjectMapper getMapper() {

src/main/java/org/whispersystems/textsecuregcm/util/Util.java

@@ -21,6 +21,7 @@ import java.net.URLEncoder;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
 import java.util.Map;
+import java.util.concurrent.TimeUnit;
 
 public class Util {
 
@@ -114,9 +115,21 @@ public class Util {
     return parts;
   }
 
-  public static void sleep(int i) {
+  public static void sleep(long i) {
     try {
       Thread.sleep(i);
     } catch (InterruptedException ie) {}
   }
+
+  public static void wait(Object object) {
+    try {
+      object.wait();
+    } catch (InterruptedException e) {
+      throw new AssertionError(e);
+    }
+  }
+
+  public static long todayInMillis() {
+    return TimeUnit.DAYS.toMillis(TimeUnit.MILLISECONDS.toDays(System.currentTimeMillis()));
+  }
 }

src/main/java/org/whispersystems/textsecuregcm/websocket/AuthenticatedConnectListener.java

@@ -0,0 +1,78 @@
+package org.whispersystems.textsecuregcm.websocket;
+
+import com.codahale.metrics.Histogram;
+import com.codahale.metrics.MetricRegistry;
+import com.codahale.metrics.SharedMetricRegistries;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.whispersystems.textsecuregcm.push.ApnFallbackManager;
+import org.whispersystems.textsecuregcm.push.PushSender;
+import org.whispersystems.textsecuregcm.push.ReceiptSender;
+import org.whispersystems.textsecuregcm.storage.Account;
+import org.whispersystems.textsecuregcm.storage.AccountsManager;
+import org.whispersystems.textsecuregcm.storage.Device;
+import org.whispersystems.textsecuregcm.storage.MessagesManager;
+import org.whispersystems.textsecuregcm.storage.PubSubManager;
+import org.whispersystems.textsecuregcm.util.Constants;
+import org.whispersystems.textsecuregcm.util.Util;
+import org.whispersystems.websocket.session.WebSocketSessionContext;
+import org.whispersystems.websocket.setup.WebSocketConnectListener;
+
+import static com.codahale.metrics.MetricRegistry.name;
+
+public class AuthenticatedConnectListener implements WebSocketConnectListener {
+
+  private static final Logger         logger            = LoggerFactory.getLogger(WebSocketConnection.class);
+  private static final MetricRegistry metricRegistry    = SharedMetricRegistries.getOrCreate(Constants.METRICS_NAME);
+  private static final Histogram      durationHistogram = metricRegistry.histogram(name(WebSocketConnection.class, "connected_duration"));
+
+  private final ApnFallbackManager apnFallbackManager;
+  private final AccountsManager    accountsManager;
+  private final PushSender         pushSender;
+  private final ReceiptSender      receiptSender;
+  private final MessagesManager    messagesManager;
+  private final PubSubManager      pubSubManager;
+
+  public AuthenticatedConnectListener(AccountsManager accountsManager, PushSender pushSender,
+                                      ReceiptSender receiptSender,  MessagesManager messagesManager,
+                                      PubSubManager pubSubManager, ApnFallbackManager apnFallbackManager)
+  {
+    this.accountsManager    = accountsManager;
+    this.pushSender         = pushSender;
+    this.receiptSender      = receiptSender;
+    this.messagesManager    = messagesManager;
+    this.pubSubManager      = pubSubManager;
+    this.apnFallbackManager = apnFallbackManager;
+  }
+
+  @Override
+  public void onWebSocketConnect(WebSocketSessionContext context) {
+    final Account             account     = context.getAuthenticated(Account.class).get();
+    final Device              device      = account.getAuthenticatedDevice().get();
+    final long                connectTime = System.currentTimeMillis();
+    final WebsocketAddress    address     = new WebsocketAddress(account.getNumber(), device.getId());
+    final WebSocketConnection connection  = new WebSocketConnection(pushSender, receiptSender,
+                                                                    messagesManager, account, device,
+                                                                    context.getClient());
+
+    apnFallbackManager.cancel(address);
+    updateLastSeen(account, device);
+    pubSubManager.subscribe(address, connection);
+
+    context.addListener(new WebSocketSessionContext.WebSocketEventListener() {
+      @Override
+      public void onWebSocketClose(WebSocketSessionContext context, int statusCode, String reason) {
+        pubSubManager.unsubscribe(address, connection);
+        durationHistogram.update(System.currentTimeMillis() - connectTime);
+      }
+    });
+  }
+
+  private void updateLastSeen(Account account, Device device) {
+    if (device.getLastSeen() != Util.todayInMillis()) {
+      device.setLastSeen(Util.todayInMillis());
+      accountsManager.update(account);
+    }
+  }
+}
+

src/main/java/org/whispersystems/textsecuregcm/websocket/ConnectListener.java

@@ -1,65 +0,0 @@
-package org.whispersystems.textsecuregcm.websocket;
-
-import com.google.common.base.Optional;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-import org.whispersystems.textsecuregcm.push.PushSender;
-import org.whispersystems.textsecuregcm.storage.Account;
-import org.whispersystems.textsecuregcm.storage.AccountsManager;
-import org.whispersystems.textsecuregcm.storage.Device;
-import org.whispersystems.textsecuregcm.storage.PubSubManager;
-import org.whispersystems.textsecuregcm.storage.StoredMessages;
-import org.whispersystems.websocket.session.WebSocketSessionContext;
-import org.whispersystems.websocket.setup.WebSocketConnectListener;
-
-public class ConnectListener implements WebSocketConnectListener {
-
-  private static final Logger logger = LoggerFactory.getLogger(WebSocketConnection.class);
-
-  private final AccountsManager accountsManager;
-  private final PushSender      pushSender;
-  private final StoredMessages  storedMessages;
-  private final PubSubManager   pubSubManager;
-
-  public ConnectListener(AccountsManager accountsManager, PushSender pushSender,
-                         StoredMessages storedMessages, PubSubManager pubSubManager)
-  {
-    this.accountsManager = accountsManager;
-    this.pushSender      = pushSender;
-    this.storedMessages  = storedMessages;
-    this.pubSubManager   = pubSubManager;
-  }
-
-  @Override
-  public void onWebSocketConnect(WebSocketSessionContext context) {
-    Optional<Account> account = context.getAuthenticated(Account.class);
-
-    if (!account.isPresent()) {
-      logger.debug("WS Connection with no authentication...");
-      context.getClient().close(4001, "Authentication failed");
-      return;
-    }
-
-    Optional<Device> device = account.get().getAuthenticatedDevice();
-
-    if (!device.isPresent()) {
-      logger.debug("WS Connection with no authenticated device...");
-      context.getClient().close(4001, "Device authentication failed");
-      return;
-    }
-
-    final WebSocketConnection connection = new WebSocketConnection(accountsManager, pushSender,
-                                                                   storedMessages, pubSubManager,
-                                                                   account.get(), device.get(),
-                                                                   context.getClient());
-
-    connection.onConnected();
-
-    context.addListener(new WebSocketSessionContext.WebSocketEventListener() {
-      @Override
-      public void onWebSocketClose(WebSocketSessionContext context, int statusCode, String reason) {
-        connection.onConnectionLost();
-      }
-    });
-  }
-}

src/main/java/org/whispersystems/textsecuregcm/websocket/DeadLetterHandler.java

@@ -0,0 +1,51 @@
+package org.whispersystems.textsecuregcm.websocket;
+
+import com.google.protobuf.InvalidProtocolBufferException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.whispersystems.dispatch.DispatchChannel;
+import org.whispersystems.textsecuregcm.entities.MessageProtos.Envelope;
+import org.whispersystems.textsecuregcm.storage.MessagesManager;
+import org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage;
+
+public class DeadLetterHandler implements DispatchChannel {
+
+  private final Logger logger = LoggerFactory.getLogger(DeadLetterHandler.class);
+
+  private final MessagesManager messagesManager;
+
+  public DeadLetterHandler(MessagesManager messagesManager) {
+    this.messagesManager = messagesManager;
+  }
+
+  @Override
+  public void onDispatchMessage(String channel, byte[] data) {
+    try {
+      logger.warn("Handling dead letter to: " + channel);
+
+      WebsocketAddress address       = new WebsocketAddress(channel);
+      PubSubMessage    pubSubMessage = PubSubMessage.parseFrom(data);
+
+      switch (pubSubMessage.getType().getNumber()) {
+        case PubSubMessage.Type.DELIVER_VALUE:
+          Envelope message = Envelope.parseFrom(pubSubMessage.getContent());
+          messagesManager.insert(address.getNumber(), address.getDeviceId(), message);
+          break;
+      }
+    } catch (InvalidProtocolBufferException e) {
+      logger.warn("Bad pubsub message", e);
+    } catch (InvalidWebsocketAddressException e) {
+      logger.warn("Invalid websocket address", e);
+    }
+  }
+
+  @Override
+  public void onDispatchSubscribed(String channel) {
+    logger.warn("DeadLetterHandler subscription notice! " + channel);
+  }
+
+  @Override
+  public void onDispatchUnsubscribed(String channel) {
+    logger.warn("DeadLetterHandler unsubscribe notice! " + channel);
+  }
+}

src/main/java/org/whispersystems/textsecuregcm/websocket/ProvisioningAddress.java

@@ -0,0 +1,33 @@
+package org.whispersystems.textsecuregcm.websocket;
+
+import org.whispersystems.textsecuregcm.util.Base64;
+
+import java.security.NoSuchAlgorithmException;
+import java.security.SecureRandom;
+
+public class ProvisioningAddress extends WebsocketAddress {
+
+  public ProvisioningAddress(String address, int id) throws InvalidWebsocketAddressException {
+    super(address, id);
+  }
+
+  public ProvisioningAddress(String serialized) throws InvalidWebsocketAddressException {
+    super(serialized);
+  }
+
+  public String getAddress() {
+    return getNumber();
+  }
+
+  public static ProvisioningAddress generate() {
+    try {
+      byte[] random = new byte[16];
+      SecureRandom.getInstance("SHA1PRNG").nextBytes(random);
+
+      return new ProvisioningAddress(Base64.encodeBytesWithoutPadding(random)
+                                           .replace('+', '-').replace('/', '_'), 0);
+    } catch (NoSuchAlgorithmException | InvalidWebsocketAddressException e) {
+      throw new AssertionError(e);
+    }
+  }
+}

src/main/java/org/whispersystems/textsecuregcm/websocket/ProvisioningConnectListener.java

@@ -0,0 +1,29 @@
+package org.whispersystems.textsecuregcm.websocket;
+
+import org.whispersystems.textsecuregcm.storage.PubSubManager;
+import org.whispersystems.websocket.session.WebSocketSessionContext;
+import org.whispersystems.websocket.setup.WebSocketConnectListener;
+
+public class ProvisioningConnectListener implements WebSocketConnectListener {
+
+  private final PubSubManager pubSubManager;
+
+  public ProvisioningConnectListener(PubSubManager pubSubManager) {
+    this.pubSubManager = pubSubManager;
+  }
+
+  @Override
+  public void onWebSocketConnect(WebSocketSessionContext context) {
+    final ProvisioningConnection connection          = new ProvisioningConnection(context.getClient());
+    final ProvisioningAddress    provisioningAddress = ProvisioningAddress.generate();
+
+    pubSubManager.subscribe(provisioningAddress, connection);
+
+    context.addListener(new WebSocketSessionContext.WebSocketEventListener() {
+      @Override
+      public void onWebSocketClose(WebSocketSessionContext context, int statusCode, String reason) {
+        pubSubManager.unsubscribe(provisioningAddress, connection);
+      }
+    });
+  }
+}

src/main/java/org/whispersystems/textsecuregcm/websocket/ProvisioningConnection.java

@@ -0,0 +1,71 @@
+package org.whispersystems.textsecuregcm.websocket;
+
+import com.google.common.base.Optional;
+import com.google.common.util.concurrent.FutureCallback;
+import com.google.common.util.concurrent.Futures;
+import com.google.common.util.concurrent.ListenableFuture;
+import com.google.protobuf.InvalidProtocolBufferException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.whispersystems.dispatch.DispatchChannel;
+import org.whispersystems.textsecuregcm.entities.MessageProtos.ProvisioningUuid;
+import org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage;
+import org.whispersystems.websocket.WebSocketClient;
+import org.whispersystems.websocket.messages.WebSocketResponseMessage;
+
+public class ProvisioningConnection implements DispatchChannel {
+
+  private final Logger logger = LoggerFactory.getLogger(ProvisioningConnection.class);
+
+  private final WebSocketClient client;
+
+  public ProvisioningConnection(WebSocketClient client) {
+    this.client = client;
+  }
+
+  @Override
+  public void onDispatchMessage(String channel, byte[] message) {
+    try {
+      PubSubMessage outgoingMessage = PubSubMessage.parseFrom(message);
+
+      if (outgoingMessage.getType() == PubSubMessage.Type.DELIVER) {
+        Optional<byte[]> body = Optional.of(outgoingMessage.getContent().toByteArray());
+
+        ListenableFuture<WebSocketResponseMessage> response = client.sendRequest("PUT", "/v1/message", body);
+
+        Futures.addCallback(response, new FutureCallback<WebSocketResponseMessage>() {
+          @Override
+          public void onSuccess(WebSocketResponseMessage webSocketResponseMessage) {
+            client.close(1001, "All you get.");
+          }
+
+          @Override
+          public void onFailure(Throwable throwable) {
+            client.close(1001, "That's all!");
+          }
+        });
+      }
+    } catch (InvalidProtocolBufferException e) {
+      logger.warn("Protobuf Error: ", e);
+    }
+  }
+
+  @Override
+  public void onDispatchSubscribed(String channel) {
+    try {
+      ProvisioningAddress address = new ProvisioningAddress(channel);
+      this.client.sendRequest("PUT", "/v1/address", Optional.of(ProvisioningUuid.newBuilder()
+                                                                                .setUuid(address.getAddress())
+                                                                                .build()
+                                                                                .toByteArray()));
+    } catch (InvalidWebsocketAddressException e) {
+      logger.warn("Badly formatted address", e);
+      this.client.close(1001, "Server Error");
+    }
+  }
+
+  @Override
+  public void onDispatchUnsubscribed(String channel) {
+    this.client.close(1001, "Closed");
+  }
+}

src/main/java/org/whispersystems/textsecuregcm/websocket/WebSocketAccountAuthenticator.java

@@ -4,6 +4,7 @@ import com.google.common.base.Optional;
 import org.eclipse.jetty.websocket.api.UpgradeRequest;
 import org.whispersystems.textsecuregcm.auth.AccountAuthenticator;
 import org.whispersystems.textsecuregcm.storage.Account;
+import org.whispersystems.textsecuregcm.storage.Device;
 import org.whispersystems.websocket.auth.AuthenticationException;
 import org.whispersystems.websocket.auth.WebSocketAuthenticator;
 
@@ -33,7 +34,9 @@ public class WebSocketAccountAuthenticator implements WebSocketAuthenticator<Acc
         return Optional.absent();
       }
 
-      BasicCredentials credentials = new BasicCredentials(usernames[0], passwords[0]);
+      BasicCredentials credentials = new BasicCredentials(usernames[0].replace(" ", "+"),
+                                                          passwords[0].replace(" ", "+"));
+      
       return accountAuthenticator.authenticate(credentials);
     } catch (io.dropwizard.auth.AuthenticationException e) {
       throw new AuthenticationException(e);

src/main/java/org/whispersystems/textsecuregcm/websocket/WebSocketConnection.java

@@ -1,160 +1,174 @@
 package org.whispersystems.textsecuregcm.websocket;
 
-import com.fasterxml.jackson.databind.ObjectMapper;
 import com.google.common.base.Optional;
 import com.google.common.util.concurrent.FutureCallback;
 import com.google.common.util.concurrent.Futures;
 import com.google.common.util.concurrent.ListenableFuture;
+import com.google.protobuf.ByteString;
+import com.google.protobuf.InvalidProtocolBufferException;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
-import org.whispersystems.textsecuregcm.entities.PendingMessage;
+import org.whispersystems.dispatch.DispatchChannel;
+import org.whispersystems.textsecuregcm.controllers.NoSuchUserException;
+import org.whispersystems.textsecuregcm.entities.CryptoEncodingException;
+import org.whispersystems.textsecuregcm.entities.EncryptedOutgoingMessage;
+import org.whispersystems.textsecuregcm.entities.OutgoingMessageEntity;
 import org.whispersystems.textsecuregcm.push.NotPushRegisteredException;
 import org.whispersystems.textsecuregcm.push.PushSender;
+import org.whispersystems.textsecuregcm.push.ReceiptSender;
 import org.whispersystems.textsecuregcm.push.TransientPushFailureException;
 import org.whispersystems.textsecuregcm.storage.Account;
-import org.whispersystems.textsecuregcm.storage.AccountsManager;
 import org.whispersystems.textsecuregcm.storage.Device;
-import org.whispersystems.textsecuregcm.storage.PubSubListener;
-import org.whispersystems.textsecuregcm.storage.PubSubManager;
-import org.whispersystems.textsecuregcm.storage.PubSubMessage;
-import org.whispersystems.textsecuregcm.storage.StoredMessages;
-import org.whispersystems.textsecuregcm.util.SystemMapper;
+import org.whispersystems.textsecuregcm.storage.MessagesManager;
 import org.whispersystems.websocket.WebSocketClient;
 import org.whispersystems.websocket.messages.WebSocketResponseMessage;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
+import javax.ws.rs.WebApplicationException;
 import java.io.IOException;
 import java.util.List;
 
-import static org.whispersystems.textsecuregcm.entities.MessageProtos.OutgoingMessageSignal;
+import static org.whispersystems.textsecuregcm.entities.MessageProtos.Envelope;
+import static org.whispersystems.textsecuregcm.storage.PubSubProtos.PubSubMessage;
 
-public class WebSocketConnection implements PubSubListener {
+public class WebSocketConnection implements DispatchChannel {
 
-  private static final Logger       logger       = LoggerFactory.getLogger(WebSocketConnection.class);
-  private static final ObjectMapper objectMapper = SystemMapper.getMapper();
+  private static final Logger logger = LoggerFactory.getLogger(WebSocketConnection.class);
 
-  private final AccountsManager  accountsManager;
+  private final ReceiptSender    receiptSender;
   private final PushSender       pushSender;
-  private final StoredMessages   storedMessages;
-  private final PubSubManager    pubSubManager;
+  private final MessagesManager  messagesManager;
 
   private final Account          account;
   private final Device           device;
-  private final WebsocketAddress address;
   private final WebSocketClient  client;
 
-  public WebSocketConnection(AccountsManager accountsManager,
-                             PushSender pushSender,
-                             StoredMessages storedMessages,
-                             PubSubManager pubSubManager,
+  public WebSocketConnection(PushSender pushSender,
+                             ReceiptSender receiptSender,
+                             MessagesManager messagesManager,
                              Account account,
                              Device device,
                              WebSocketClient client)
   {
-    this.accountsManager = accountsManager;
     this.pushSender      = pushSender;
-    this.storedMessages  = storedMessages;
-    this.pubSubManager   = pubSubManager;
+    this.receiptSender   = receiptSender;
+    this.messagesManager = messagesManager;
     this.account         = account;
     this.device          = device;
     this.client          = client;
-    this.address         = new WebsocketAddress(account.getNumber(), device.getId());
-  }
-
-  public void onConnected() {
-    pubSubManager.subscribe(address, this);
-    processStoredMessages();
-  }
-
-  public void onConnectionLost() {
-    pubSubManager.unsubscribe(address, this);
   }
 
   @Override
-  public void onPubSubMessage(PubSubMessage message) {
+  public void onDispatchMessage(String channel, byte[] message) {
     try {
-      switch (message.getType()) {
-        case PubSubMessage.TYPE_QUERY_DB:
+      PubSubMessage pubSubMessage = PubSubMessage.parseFrom(message);
+
+      switch (pubSubMessage.getType().getNumber()) {
+        case PubSubMessage.Type.QUERY_DB_VALUE:
           processStoredMessages();
           break;
-        case PubSubMessage.TYPE_DELIVER:
-          PendingMessage pendingMessage = objectMapper.readValue(message.getContents(),
-                                                                 PendingMessage.class);
-          sendMessage(pendingMessage);
+        case PubSubMessage.Type.DELIVER_VALUE:
+          sendMessage(Envelope.parseFrom(pubSubMessage.getContent()), Optional.<Long>absent());
           break;
         default:
-          logger.warn("Unknown pubsub message: " + message.getType());
+          logger.warn("Unknown pubsub message: " + pubSubMessage.getType().getNumber());
       }
-    } catch (IOException e) {
-      logger.warn("Error deserializing PendingMessage", e);
+    } catch (InvalidProtocolBufferException e) {
+      logger.warn("Protobuf parse error", e);
     }
   }
 
-  private void sendMessage(final PendingMessage message) {
-    String                                     content  = message.getEncryptedOutgoingMessage();
-    Optional<byte[]>                           body     = Optional.fromNullable(content.getBytes());
-    ListenableFuture<WebSocketResponseMessage> response = client.sendRequest("PUT", "/api/v1/message", body);
-
-    Futures.addCallback(response, new FutureCallback<WebSocketResponseMessage>() {
-      @Override
-      public void onSuccess(@Nullable WebSocketResponseMessage response) {
-        if (isSuccessResponse(response) && !message.isReceipt()) {
-          sendDeliveryReceiptFor(message);
-        } else if (!isSuccessResponse(response)) {
-          requeueMessage(message);
-        }
-      }
-
-      @Override
-      public void onFailure(@Nonnull Throwable throwable) {
-        requeueMessage(message);
-      }
-
-      private boolean isSuccessResponse(WebSocketResponseMessage response) {
-        return response != null && response.getStatus() >= 200 && response.getStatus() < 300;
-      }
-    });
+  @Override
+  public void onDispatchUnsubscribed(String channel) {
+    client.close(1000, "OK");
   }
 
-  private void requeueMessage(PendingMessage message) {
+  public void onDispatchSubscribed(String channel) {
+    processStoredMessages();
+  }
+
+  private void sendMessage(final Envelope message,
+                           final Optional<Long> storedMessageId)
+  {
+    try {
+      EncryptedOutgoingMessage                   encryptedMessage = new EncryptedOutgoingMessage(message, device.getSignalingKey());
+      Optional<byte[]>                           body             = Optional.fromNullable(encryptedMessage.toByteArray());
+      ListenableFuture<WebSocketResponseMessage> response         = client.sendRequest("PUT", "/api/v1/message", body);
+
+      Futures.addCallback(response, new FutureCallback<WebSocketResponseMessage>() {
+        @Override
+        public void onSuccess(@Nullable WebSocketResponseMessage response) {
+          boolean isReceipt = message.getType() == Envelope.Type.RECEIPT;
+
+          if (isSuccessResponse(response)) {
+            if (storedMessageId.isPresent()) messagesManager.delete(account.getNumber(), storedMessageId.get());
+            if (!isReceipt)                  sendDeliveryReceiptFor(message);
+          } else if (!isSuccessResponse(response) && !storedMessageId.isPresent()) {
+            requeueMessage(message);
+          }
+        }
+
+        @Override
+        public void onFailure(@Nonnull Throwable throwable) {
+          if (!storedMessageId.isPresent()) requeueMessage(message);
+        }
+
+        private boolean isSuccessResponse(WebSocketResponseMessage response) {
+          return response != null && response.getStatus() >= 200 && response.getStatus() < 300;
+        }
+      });
+    } catch (CryptoEncodingException e) {
+      logger.warn("Bad signaling key", e);
+    }
+  }
+
+  private void requeueMessage(Envelope message) {
     try {
       pushSender.sendMessage(account, device, message);
     } catch (NotPushRegisteredException | TransientPushFailureException e) {
       logger.warn("requeueMessage", e);
-      storedMessages.insert(address, message);
+      messagesManager.insert(account.getNumber(), device.getId(), message);
     }
   }
 
-  private void sendDeliveryReceiptFor(PendingMessage message) {
+  private void sendDeliveryReceiptFor(Envelope message) {
     try {
-      Optional<Account> source = accountsManager.get(message.getSender());
-
-      if (!source.isPresent()) {
-        logger.warn("Source account disappeared? (%s)", message.getSender());
-        return;
-      }
-
-      OutgoingMessageSignal.Builder receipt =
-          OutgoingMessageSignal.newBuilder()
-                               .setSource(account.getNumber())
-                               .setSourceDevice((int) device.getId())
-                               .setTimestamp(message.getMessageId())
-                               .setType(OutgoingMessageSignal.Type.RECEIPT_VALUE);
-
-      for (Device device : source.get().getDevices()) {
-        pushSender.sendMessage(source.get(), device, receipt.build());
-      }
-    } catch (NotPushRegisteredException | TransientPushFailureException e) {
-      logger.warn("sendDeliveryReceiptFor", "Delivery receipet", e);
+      receiptSender.sendReceipt(account, message.getSource(), message.getTimestamp(),
+                                message.hasRelay() ? Optional.of(message.getRelay()) :
+                                                     Optional.<String>absent());
+    } catch (IOException | NoSuchUserException | TransientPushFailureException | NotPushRegisteredException  e) {
+      logger.warn("sendDeliveryReceiptFor", e);
+    } catch (WebApplicationException e) {
+      logger.warn("Bad federated response for receipt: " + e.getResponse().getStatus());
     }
   }
 
   private void processStoredMessages() {
-    List<PendingMessage> messages = storedMessages.getMessagesForDevice(address);
+    List<OutgoingMessageEntity> messages = messagesManager.getMessagesForDevice(account.getNumber(), device.getId());
 
-    for (PendingMessage message : messages) {
-      sendMessage(message);
+    for (OutgoingMessageEntity message : messages) {
+      Envelope.Builder builder = Envelope.newBuilder()
+                                         .setType(Envelope.Type.valueOf(message.getType()))
+                                         .setSourceDevice(message.getSourceDevice())
+                                         .setSource(message.getSource())
+                                         .setTimestamp(message.getTimestamp());
+
+      if (message.getMessage() != null) {
+        builder.setLegacyMessage(ByteString.copyFrom(message.getMessage()));
+      }
+
+      if (message.getContent() != null) {
+        builder.setContent(ByteString.copyFrom(message.getContent()));
+      }
+
+      if (message.getRelay() != null && !message.getRelay().isEmpty()) {
+        builder.setRelay(message.getRelay());
+      }
+
+      sendMessage(builder.build(), Optional.of(message.getId()));
     }
   }
+
+
 }

src/main/java/org/whispersystems/textsecuregcm/websocket/WebsocketAddress.java

@@ -10,6 +10,29 @@ public class WebsocketAddress {
     this.deviceId  = deviceId;
   }
 
+  public WebsocketAddress(String serialized) throws InvalidWebsocketAddressException {
+    try {
+      String[] parts = serialized.split(":", 2);
+
+      if (parts.length != 2) {
+        throw new InvalidWebsocketAddressException("Bad address: " + serialized);
+      }
+
+      this.number   = parts[0];
+      this.deviceId = Long.parseLong(parts[1]);
+    } catch (NumberFormatException e) {
+      throw new InvalidWebsocketAddressException(e);
+    }
+  }
+
+  public String getNumber() {
+    return number;
+  }
+
+  public long getDeviceId() {
+    return deviceId;
+  }
+
   public String serialize() {
     return number + ":" + deviceId;
   }

src/main/java/org/whispersystems/textsecuregcm/workers/DirectoryCommand.java

@@ -17,13 +17,11 @@
 package org.whispersystems.textsecuregcm.workers;
 
 import net.sourceforge.argparse4j.inf.Namespace;
-import net.spy.memcached.MemcachedClient;
 import org.skife.jdbi.v2.DBI;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.whispersystems.textsecuregcm.WhisperServerConfiguration;
 import org.whispersystems.textsecuregcm.federation.FederatedClientManager;
-import org.whispersystems.textsecuregcm.providers.MemcachedClientFactory;
 import org.whispersystems.textsecuregcm.providers.RedisClientFactory;
 import org.whispersystems.textsecuregcm.storage.Accounts;
 import org.whispersystems.textsecuregcm.storage.AccountsManager;
@@ -62,10 +60,10 @@ public class DirectoryCommand extends ConfiguredCommand<WhisperServerConfigurati
       dbi.registerContainerFactory(new OptionalContainerFactory());
 
       Accounts               accounts               = dbi.onDemand(Accounts.class);
-      MemcachedClient        memcachedClient        = new MemcachedClientFactory(config.getMemcacheConfiguration()).getClient();
-      JedisPool              redisClient            = new RedisClientFactory(config.getRedisConfiguration()).getRedisClientPool();
+      JedisPool              cacheClient            = new RedisClientFactory(config.getCacheConfiguration().getUrl()).getRedisClientPool();
+      JedisPool              redisClient            = new RedisClientFactory(config.getDirectoryConfiguration().getUrl()).getRedisClientPool();
       DirectoryManager       directory              = new DirectoryManager(redisClient);
-      AccountsManager        accountsManager        = new AccountsManager(accounts, directory, memcachedClient);
+      AccountsManager        accountsManager        = new AccountsManager(accounts, directory, cacheClient);
       FederatedClientManager federatedClientManager = new FederatedClientManager(config.getFederationConfiguration());
 
       DirectoryUpdater update = new DirectoryUpdater(accountsManager, federatedClientManager, directory);