Delete empty message cache directories

[signal-cli] / src / main / java / org / asamk / signal / Manager.java

diff --git a/src/main/java/org/asamk/signal/Manager.java b/src/main/java/org/asamk/signal/Manager.java
index 3ce9dfbe144595ad3a76563fcf020717bfabcdd2..dc9799308813938a7110ae34e1b48e704b302939 100644 (file)
--- a/src/main/java/org/asamk/signal/Manager.java
+++ b/src/main/java/org/asamk/signal/Manager.java
@@ -27,10 +27,21 @@ import com.fasterxml.jackson.databind.SerializationFeature;
 import com.fasterxml.jackson.databind.node.ObjectNode;
 import org.apache.http.util.TextUtils;
 import org.asamk.Signal;
 import com.fasterxml.jackson.databind.node.ObjectNode;
 import org.apache.http.util.TextUtils;
 import org.asamk.Signal;

+import org.asamk.signal.storage.contacts.ContactInfo;
+import org.asamk.signal.storage.contacts.JsonContactsStore;
+import org.asamk.signal.storage.groups.GroupInfo;
+import org.asamk.signal.storage.groups.JsonGroupStore;
+import org.asamk.signal.storage.protocol.JsonIdentityKeyStore;
+import org.asamk.signal.storage.protocol.JsonSignalProtocolStore;
+import org.asamk.signal.storage.threads.JsonThreadStore;
+import org.asamk.signal.storage.threads.ThreadInfo;
+import org.asamk.signal.util.Util;

 import org.whispersystems.libsignal.*;
 import org.whispersystems.libsignal.ecc.Curve;
 import org.whispersystems.libsignal.ecc.ECKeyPair;
 import org.whispersystems.libsignal.ecc.ECPublicKey;
 import org.whispersystems.libsignal.*;
 import org.whispersystems.libsignal.ecc.Curve;
 import org.whispersystems.libsignal.ecc.ECKeyPair;
 import org.whispersystems.libsignal.ecc.ECPublicKey;

+import org.whispersystems.libsignal.fingerprint.Fingerprint;
+import org.whispersystems.libsignal.fingerprint.NumericFingerprintGenerator;

 import org.whispersystems.libsignal.state.PreKeyRecord;
 import org.whispersystems.libsignal.state.SignedPreKeyRecord;
 import org.whispersystems.libsignal.util.KeyHelper;
 import org.whispersystems.libsignal.state.PreKeyRecord;
 import org.whispersystems.libsignal.state.SignedPreKeyRecord;
 import org.whispersystems.libsignal.util.KeyHelper;


@@ -44,12 +55,15 @@ import org.whispersystems.signalservice.api.crypto.SignalServiceCipher;
 import org.whispersystems.signalservice.api.crypto.UntrustedIdentityException;
 import org.whispersystems.signalservice.api.messages.*;
 import org.whispersystems.signalservice.api.messages.multidevice.*;
 import org.whispersystems.signalservice.api.crypto.UntrustedIdentityException;
 import org.whispersystems.signalservice.api.messages.*;
 import org.whispersystems.signalservice.api.messages.multidevice.*;

+import org.whispersystems.signalservice.api.push.ContactTokenDetails;

 import org.whispersystems.signalservice.api.push.SignalServiceAddress;
 import org.whispersystems.signalservice.api.push.TrustStore;
 import org.whispersystems.signalservice.api.push.exceptions.*;
 import org.whispersystems.signalservice.api.util.InvalidNumberException;
 import org.whispersystems.signalservice.api.util.PhoneNumberFormatter;
 import org.whispersystems.signalservice.internal.push.SignalServiceProtos;
 import org.whispersystems.signalservice.api.push.SignalServiceAddress;
 import org.whispersystems.signalservice.api.push.TrustStore;
 import org.whispersystems.signalservice.api.push.exceptions.*;
 import org.whispersystems.signalservice.api.util.InvalidNumberException;
 import org.whispersystems.signalservice.api.util.PhoneNumberFormatter;
 import org.whispersystems.signalservice.internal.push.SignalServiceProtos;

+import org.whispersystems.signalservice.internal.push.SignalServiceUrl;
+import org.whispersystems.signalservice.internal.util.Base64;

 
 import java.io.*;
 import java.net.URI;
 
 import java.io.*;
 import java.net.URI;


@@ -60,15 +74,21 @@ import java.nio.channels.Channels;
 import java.nio.channels.FileChannel;
 import java.nio.channels.FileLock;
 import java.nio.file.Files;
 import java.nio.channels.FileChannel;
 import java.nio.channels.FileLock;
 import java.nio.file.Files;

+import java.nio.file.Path;

 import java.nio.file.Paths;
 import java.nio.file.StandardCopyOption;
 import java.nio.file.Paths;
 import java.nio.file.StandardCopyOption;

+import java.nio.file.attribute.PosixFilePermission;
+import java.nio.file.attribute.PosixFilePermissions;

 import java.util.*;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
 
 import java.util.*;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
 

+import static java.nio.file.attribute.PosixFilePermission.*;
+

 class Manager implements Signal {
     private final static String URL = "https://textsecure-service.whispersystems.org";
     private final static TrustStore TRUST_STORE = new WhisperTrustStore();
 class Manager implements Signal {
     private final static String URL = "https://textsecure-service.whispersystems.org";
     private final static TrustStore TRUST_STORE = new WhisperTrustStore();

+    private final static SignalServiceUrl[] serviceUrls = new SignalServiceUrl[]{new SignalServiceUrl(URL, TRUST_STORE)};

 
     public final static String PROJECT_NAME = Manager.class.getPackage().getImplementationTitle();
     public final static String PROJECT_VERSION = Manager.class.getPackage().getImplementationVersion();
 
     public final static String PROJECT_NAME = Manager.class.getPackage().getImplementationTitle();
     public final static String PROJECT_VERSION = Manager.class.getPackage().getImplementationVersion();


@@ -76,6 +96,7 @@ class Manager implements Signal {
 
     private final static int PREKEY_MINIMUM_COUNT = 20;
     private static final int PREKEY_BATCH_SIZE = 100;
 
     private final static int PREKEY_MINIMUM_COUNT = 20;
     private static final int PREKEY_BATCH_SIZE = 100;

+    private static final int MAX_ATTACHMENT_SIZE = 150 * 1024 * 1024;

 
     private final String settingsPath;
     private final String dataPath;
 
     private final String settingsPath;
     private final String dataPath;


@@ -85,7 +106,7 @@ class Manager implements Signal {
     private FileChannel fileChannel;
     private FileLock lock;
 
     private FileChannel fileChannel;
     private FileLock lock;
 

-    private final ObjectMapper jsonProcessot = new ObjectMapper();
+    private final ObjectMapper jsonProcessor = new ObjectMapper();

     private String username;
     private int deviceId = SignalServiceAddress.DEFAULT_DEVICE_ID;
     private String password;
     private String username;
     private int deviceId = SignalServiceAddress.DEFAULT_DEVICE_ID;
     private String password;


@@ -99,6 +120,8 @@ class Manager implements Signal {
     private SignalServiceAccountManager accountManager;
     private JsonGroupStore groupStore;
     private JsonContactsStore contactStore;
     private SignalServiceAccountManager accountManager;
     private JsonGroupStore groupStore;
     private JsonContactsStore contactStore;

+    private JsonThreadStore threadStore;
+    private SignalServiceMessagePipe messagePipe = null;

 
     public Manager(String username, String settingsPath) {
         this.username = username;
 
     public Manager(String username, String settingsPath) {
         this.username = username;


@@ -107,27 +130,64 @@ class Manager implements Signal {
         this.attachmentsPath = this.settingsPath + "/attachments";
         this.avatarsPath = this.settingsPath + "/avatars";
 
         this.attachmentsPath = this.settingsPath + "/attachments";
         this.avatarsPath = this.settingsPath + "/avatars";
 

-        jsonProcessot.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.NONE); // disable autodetect
-        jsonProcessot.enable(SerializationFeature.INDENT_OUTPUT); // for pretty print, you can disable it.
-        jsonProcessot.enable(SerializationFeature.WRITE_NULL_MAP_VALUES);
-        jsonProcessot.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
-        jsonProcessot.disable(JsonParser.Feature.AUTO_CLOSE_SOURCE);
-        jsonProcessot.disable(JsonGenerator.Feature.AUTO_CLOSE_TARGET);
+        jsonProcessor.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.NONE); // disable autodetect
+        jsonProcessor.enable(SerializationFeature.INDENT_OUTPUT); // for pretty print, you can disable it.
+        jsonProcessor.enable(SerializationFeature.WRITE_NULL_MAP_VALUES);
+        jsonProcessor.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
+        jsonProcessor.disable(JsonParser.Feature.AUTO_CLOSE_SOURCE);
+        jsonProcessor.disable(JsonGenerator.Feature.AUTO_CLOSE_TARGET);

     }
 
     public String getUsername() {
         return username;
     }
 
     }
 
     public String getUsername() {
         return username;
     }
 

+    private IdentityKey getIdentity() {
+        return signalProtocolStore.getIdentityKeyPair().getPublicKey();
+    }
+

     public int getDeviceId() {
         return deviceId;
     }
 
     public String getFileName() {
     public int getDeviceId() {
         return deviceId;
     }
 
     public String getFileName() {

-        new File(dataPath).mkdirs();

         return dataPath + "/" + username;
     }
 
         return dataPath + "/" + username;
     }
 

+    private String getMessageCachePath() {
+        return this.dataPath + "/" + username + ".d/msg-cache";
+    }
+
+    private String getMessageCachePath(String sender) {
+        return getMessageCachePath() + "/" + sender.replace("/", "_");
+    }
+
+    private File getMessageCacheFile(String sender, long now, long timestamp) throws IOException {
+        String cachePath = getMessageCachePath(sender);
+        createPrivateDirectories(cachePath);
+        return new File(cachePath + "/" + now + "_" + timestamp);
+    }
+
+    private static void createPrivateDirectories(String path) throws IOException {
+        final Path file = new File(path).toPath();
+        try {
+            Set<PosixFilePermission> perms = EnumSet.of(OWNER_READ, OWNER_WRITE, OWNER_EXECUTE);
+            Files.createDirectories(file, PosixFilePermissions.asFileAttribute(perms));
+        } catch (UnsupportedOperationException e) {
+            Files.createDirectories(file);
+        }
+    }
+
+    private static void createPrivateFile(String path) throws IOException {
+        final Path file = new File(path).toPath();
+        try {
+            Set<PosixFilePermission> perms = EnumSet.of(OWNER_READ, OWNER_WRITE);
+            Files.createFile(file, PosixFilePermissions.asFileAttribute(perms));
+        } catch (UnsupportedOperationException e) {
+            Files.createFile(file);
+        }
+    }
+

     public boolean userExists() {
         if (username == null) {
             return false;
     public boolean userExists() {
         if (username == null) {
             return false;


@@ -153,6 +213,10 @@ class Manager implements Signal {
         if (fileChannel != null)
             return;
 
         if (fileChannel != null)
             return;
 

+        createPrivateDirectories(dataPath);
+        if (!new File(getFileName()).exists()) {
+            createPrivateFile(getFileName());
+        }

         fileChannel = new RandomAccessFile(new File(getFileName()), "rw").getChannel();
         lock = fileChannel.tryLock();
         if (lock == null) {
         fileChannel = new RandomAccessFile(new File(getFileName()), "rw").getChannel();
         lock = fileChannel.tryLock();
         if (lock == null) {


@@ -162,9 +226,25 @@ class Manager implements Signal {
         }
     }
 
         }
     }
 

-    public void load() throws IOException, InvalidKeyException {
+    public void init() throws IOException {
+        load();
+
+        migrateLegacyConfigs();
+
+        accountManager = new SignalServiceAccountManager(serviceUrls, username, password, deviceId, USER_AGENT);
+        try {
+            if (registered && accountManager.getPreKeysCount() < PREKEY_MINIMUM_COUNT) {
+                refreshPreKeys();
+                save();
+            }
+        } catch (AuthorizationFailedException e) {
+            System.err.println("Authorization failed, was the number registered elsewhere?");
+        }
+    }
+
+    private void load() throws IOException {

         openFileChannel();
         openFileChannel();

-        JsonNode rootNode = jsonProcessot.readTree(Channels.newInputStream(fileChannel));
+        JsonNode rootNode = jsonProcessor.readTree(Channels.newInputStream(fileChannel));

 
         JsonNode node = rootNode.get("deviceId");
         if (node != null) {
 
         JsonNode node = rootNode.get("deviceId");
         if (node != null) {


@@ -185,58 +265,58 @@ class Manager implements Signal {
         } else {
             nextSignedPreKeyId = 0;
         }
         } else {
             nextSignedPreKeyId = 0;
         }

-        signalProtocolStore = jsonProcessot.convertValue(getNotNullNode(rootNode, "axolotlStore"), JsonSignalProtocolStore.class);
+        signalProtocolStore = jsonProcessor.convertValue(getNotNullNode(rootNode, "axolotlStore"), JsonSignalProtocolStore.class);

         registered = getNotNullNode(rootNode, "registered").asBoolean();
         JsonNode groupStoreNode = rootNode.get("groupStore");
         if (groupStoreNode != null) {
         registered = getNotNullNode(rootNode, "registered").asBoolean();
         JsonNode groupStoreNode = rootNode.get("groupStore");
         if (groupStoreNode != null) {

-            groupStore = jsonProcessot.convertValue(groupStoreNode, JsonGroupStore.class);
+            groupStore = jsonProcessor.convertValue(groupStoreNode, JsonGroupStore.class);

         }
         if (groupStore == null) {
             groupStore = new JsonGroupStore();
         }
         }
         if (groupStore == null) {
             groupStore = new JsonGroupStore();
         }

+
+        JsonNode contactStoreNode = rootNode.get("contactStore");
+        if (contactStoreNode != null) {
+            contactStore = jsonProcessor.convertValue(contactStoreNode, JsonContactsStore.class);
+        }
+        if (contactStore == null) {
+            contactStore = new JsonContactsStore();
+        }
+        JsonNode threadStoreNode = rootNode.get("threadStore");
+        if (threadStoreNode != null) {
+            threadStore = jsonProcessor.convertValue(threadStoreNode, JsonThreadStore.class);
+        }
+        if (threadStore == null) {
+            threadStore = new JsonThreadStore();
+        }
+    }
+
+    private void migrateLegacyConfigs() {

         // Copy group avatars that were previously stored in the attachments folder
         // to the new avatar folder
         // Copy group avatars that were previously stored in the attachments folder
         // to the new avatar folder

-        if (groupStore.groupsWithLegacyAvatarId.size() > 0) {
-            for (GroupInfo g : groupStore.groupsWithLegacyAvatarId) {
+        if (JsonGroupStore.groupsWithLegacyAvatarId.size() > 0) {
+            for (GroupInfo g : JsonGroupStore.groupsWithLegacyAvatarId) {

                 File avatarFile = getGroupAvatarFile(g.groupId);
                 File attachmentFile = getAttachmentFile(g.getAvatarId());
                 if (!avatarFile.exists() && attachmentFile.exists()) {
                     try {
                 File avatarFile = getGroupAvatarFile(g.groupId);
                 File attachmentFile = getAttachmentFile(g.getAvatarId());
                 if (!avatarFile.exists() && attachmentFile.exists()) {
                     try {

-                        new File(avatarsPath).mkdirs();
+                        createPrivateDirectories(avatarsPath);

                         Files.copy(attachmentFile.toPath(), avatarFile.toPath(), StandardCopyOption.REPLACE_EXISTING);
                     } catch (Exception e) {
                         // Ignore
                     }
                 }
             }
                         Files.copy(attachmentFile.toPath(), avatarFile.toPath(), StandardCopyOption.REPLACE_EXISTING);
                     } catch (Exception e) {
                         // Ignore
                     }
                 }
             }

-            groupStore.groupsWithLegacyAvatarId.clear();
+            JsonGroupStore.groupsWithLegacyAvatarId.clear();

             save();
         }
             save();
         }

-
-        JsonNode contactStoreNode = rootNode.get("contactStore");
-        if (contactStoreNode != null) {
-            contactStore = jsonProcessot.convertValue(contactStoreNode, JsonContactsStore.class);
-        }
-        if (contactStore == null) {
-            contactStore = new JsonContactsStore();
-        }
-
-        accountManager = new SignalServiceAccountManager(URL, TRUST_STORE, username, password, deviceId, USER_AGENT);
-        try {
-            if (registered && accountManager.getPreKeysCount() < PREKEY_MINIMUM_COUNT) {
-                refreshPreKeys();
-                save();
-            }
-        } catch (AuthorizationFailedException e) {
-            System.err.println("Authorization failed, was the number registered elsewhere?");
-        }

     }
 
     private void save() {
         if (username == null) {
             return;
         }
     }
 
     private void save() {
         if (username == null) {
             return;
         }

-        ObjectNode rootNode = jsonProcessot.createObjectNode();
+        ObjectNode rootNode = jsonProcessor.createObjectNode();

         rootNode.put("username", username)
                 .put("deviceId", deviceId)
                 .put("password", password)
         rootNode.put("username", username)
                 .put("deviceId", deviceId)
                 .put("password", password)


@@ -247,11 +327,12 @@ class Manager implements Signal {
                 .putPOJO("axolotlStore", signalProtocolStore)
                 .putPOJO("groupStore", groupStore)
                 .putPOJO("contactStore", contactStore)
                 .putPOJO("axolotlStore", signalProtocolStore)
                 .putPOJO("groupStore", groupStore)
                 .putPOJO("contactStore", contactStore)

+                .putPOJO("threadStore", threadStore)

         ;
         try {
             openFileChannel();
             fileChannel.position(0);
         ;
         try {
             openFileChannel();
             fileChannel.position(0);

-            jsonProcessot.writeValue(Channels.newOutputStream(fileChannel), rootNode);
+            jsonProcessor.writeValue(Channels.newOutputStream(fileChannel), rootNode);

             fileChannel.truncate(fileChannel.position());
             fileChannel.force(false);
         } catch (Exception e) {
             fileChannel.truncate(fileChannel.position());
             fileChannel.force(false);
         } catch (Exception e) {


@@ -275,7 +356,7 @@ class Manager implements Signal {
     public void register(boolean voiceVerification) throws IOException {
         password = Util.getSecret(18);
 
     public void register(boolean voiceVerification) throws IOException {
         password = Util.getSecret(18);
 

-        accountManager = new SignalServiceAccountManager(URL, TRUST_STORE, username, password, USER_AGENT);
+        accountManager = new SignalServiceAccountManager(serviceUrls, username, password, USER_AGENT);

 
         if (voiceVerification)
             accountManager.requestVoiceVerificationCode();
 
         if (voiceVerification)
             accountManager.requestVoiceVerificationCode();


@@ -286,10 +367,21 @@ class Manager implements Signal {
         save();
     }
 
         save();
     }
 

+    public void updateAccountAttributes() throws IOException {
+        accountManager.setAccountAttributes(signalingKey, signalProtocolStore.getLocalRegistrationId(), false, false, true);
+    }
+
+    public void unregister() throws IOException {
+        // When setting an empty GCM id, the Signal-Server also sets the fetchesMessages property to false.
+        // If this is the master device, other users can't send messages to this number anymore.
+        // If this is a linked device, other users can still send messages, but this device doesn't receive them anymore.
+        accountManager.setGcmId(Optional.<String>absent());
+    }
+

     public URI getDeviceLinkUri() throws TimeoutException, IOException {
         password = Util.getSecret(18);
 
     public URI getDeviceLinkUri() throws TimeoutException, IOException {
         password = Util.getSecret(18);
 

-        accountManager = new SignalServiceAccountManager(URL, TRUST_STORE, username, password, USER_AGENT);
+        accountManager = new SignalServiceAccountManager(serviceUrls, username, password, USER_AGENT);

         String uuid = accountManager.getNewDeviceUuid();
 
         registered = false;
         String uuid = accountManager.getNewDeviceUuid();
 
         registered = false;


@@ -426,7 +518,7 @@ class Manager implements Signal {
     public void verifyAccount(String verificationCode) throws IOException {
         verificationCode = verificationCode.replace("-", "");
         signalingKey = Util.getSecret(52);
     public void verifyAccount(String verificationCode) throws IOException {
         verificationCode = verificationCode.replace("-", "");
         signalingKey = Util.getSecret(52);

-        accountManager.verifyAccountWithCode(verificationCode, signalingKey, signalProtocolStore.getLocalRegistrationId(), false, true);
+        accountManager.verifyAccountWithCode(verificationCode, signalingKey, signalProtocolStore.getLocalRegistrationId(), false, false, true);

 
         //accountManager.setGcmId(Optional.of(GoogleCloudMessaging.getInstance(this).register(REGISTRATION_ID)));
         registered = true;
 
         //accountManager.setGcmId(Optional.of(GoogleCloudMessaging.getInstance(this).register(REGISTRATION_ID)));
         registered = true;


@@ -466,7 +558,8 @@ class Manager implements Signal {
         if (mime == null) {
             mime = "application/octet-stream";
         }
         if (mime == null) {
             mime = "application/octet-stream";
         }

-        return new SignalServiceAttachmentStream(attachmentStream, mime, attachmentSize, null);
+        // TODO mabybe add a parameter to set the voiceNote and preview option
+        return new SignalServiceAttachmentStream(attachmentStream, mime, attachmentSize, Optional.of(attachmentFile.getName()), false, Optional.<byte[]>absent(), null);

     }
 
     private Optional<SignalServiceAttachmentStream> createGroupAvatarAttachment(byte[] groupId) throws IOException {
     }
 
     private Optional<SignalServiceAttachmentStream> createGroupAvatarAttachment(byte[] groupId) throws IOException {


@@ -487,6 +580,23 @@ class Manager implements Signal {
         return Optional.of(createAttachment(file));
     }
 
         return Optional.of(createAttachment(file));
     }
 

+    private GroupInfo getGroupForSending(byte[] groupId) throws GroupNotFoundException, NotAGroupMemberException {
+        GroupInfo g = groupStore.getGroup(groupId);
+        if (g == null) {
+            throw new GroupNotFoundException(groupId);
+        }
+        for (String member : g.members) {
+            if (member.equals(this.username)) {
+                return g;
+            }
+        }
+        throw new NotAGroupMemberException(groupId, g.name);
+    }
+
+    public List<GroupInfo> getGroups() {
+        return groupStore.getGroups();
+    }
+

     @Override
     public void sendGroupMessage(String messageText, List<String> attachments,
                                  byte[] groupId)
     @Override
     public void sendGroupMessage(String messageText, List<String> attachments,
                                  byte[] groupId)


@@ -501,17 +611,17 @@ class Manager implements Signal {
                     .build();
             messageBuilder.asGroupMessage(group);
         }
                     .build();
             messageBuilder.asGroupMessage(group);
         }

-        SignalServiceDataMessage message = messageBuilder.build();
-
-        GroupInfo g = groupStore.getGroup(groupId);
-        if (g == null) {
-            throw new GroupNotFoundException(groupId);
+        ThreadInfo thread = threadStore.getThread(Base64.encodeBytes(groupId));
+        if (thread != null) {
+            messageBuilder.withExpiration(thread.messageExpirationTime);

         }
 
         }
 

+        final GroupInfo g = getGroupForSending(groupId);
+

         // Don't send group message to ourself
         final List<String> membersSend = new ArrayList<>(g.members);
         membersSend.remove(this.username);
         // Don't send group message to ourself
         final List<String> membersSend = new ArrayList<>(g.members);
         membersSend.remove(this.username);

-        sendMessage(message, membersSend);
+        sendMessage(messageBuilder, membersSend);

     }
 
     public void sendQuitGroupMessage(byte[] groupId) throws GroupNotFoundException, IOException, EncapsulatedExceptions {
     }
 
     public void sendQuitGroupMessage(byte[] groupId) throws GroupNotFoundException, IOException, EncapsulatedExceptions {


@@ -519,18 +629,26 @@ class Manager implements Signal {
                 .withId(groupId)
                 .build();
 
                 .withId(groupId)
                 .build();
 

-        SignalServiceDataMessage message = SignalServiceDataMessage.newBuilder()
-                .asGroupMessage(group)
-                .build();
+        SignalServiceDataMessage.Builder messageBuilder = SignalServiceDataMessage.newBuilder()
+                .asGroupMessage(group);

 
 

-        final GroupInfo g = groupStore.getGroup(groupId);
-        if (g == null) {
-            throw new GroupNotFoundException(groupId);
-        }
+        final GroupInfo g = getGroupForSending(groupId);

         g.members.remove(this.username);
         groupStore.updateGroup(g);
 
         g.members.remove(this.username);
         groupStore.updateGroup(g);
 

-        sendMessage(message, g.members);
+        sendMessage(messageBuilder, g.members);
+    }
+
+    private static String join(CharSequence separator, Iterable<? extends CharSequence> list) {
+        StringBuilder buf = new StringBuilder();
+        for (CharSequence str : list) {
+            if (buf.length() > 0) {
+                buf.append(separator);
+            }
+            buf.append(str);
+        }
+
+        return buf.toString();

     }
 
     public byte[] sendUpdateGroupMessage(byte[] groupId, String name, Collection<String> members, String avatarFile) throws IOException, EncapsulatedExceptions, GroupNotFoundException, AttachmentInvalidException {
     }
 
     public byte[] sendUpdateGroupMessage(byte[] groupId, String name, Collection<String> members, String avatarFile) throws IOException, EncapsulatedExceptions, GroupNotFoundException, AttachmentInvalidException {


@@ -540,10 +658,7 @@ class Manager implements Signal {
             g = new GroupInfo(Util.getSecretBytes(16));
             g.members.add(username);
         } else {
             g = new GroupInfo(Util.getSecretBytes(16));
             g.members.add(username);
         } else {

-            g = groupStore.getGroup(groupId);
-            if (g == null) {
-                throw new GroupNotFoundException(groupId);
-            }
+            g = getGroupForSending(groupId);

         }
 
         if (name != null) {
         }
 
         if (name != null) {


@@ -551,46 +666,102 @@ class Manager implements Signal {
         }
 
         if (members != null) {
         }
 
         if (members != null) {

+            Set<String> newMembers = new HashSet<>();

             for (String member : members) {
                 try {
             for (String member : members) {
                 try {

-                    g.members.add(canonicalizeNumber(member));
+                    member = canonicalizeNumber(member);

                 } catch (InvalidNumberException e) {
                     System.err.println("Failed to add member \"" + member + "\" to group: " + e.getMessage());
                     System.err.println("Aborting…");
                     System.exit(1);
                 }
                 } catch (InvalidNumberException e) {
                     System.err.println("Failed to add member \"" + member + "\" to group: " + e.getMessage());
                     System.err.println("Aborting…");
                     System.exit(1);
                 }

+                if (g.members.contains(member)) {
+                    continue;
+                }
+                newMembers.add(member);
+                g.members.add(member);

             }
             }

+            final List<ContactTokenDetails> contacts = accountManager.getContacts(newMembers);
+            if (contacts.size() != newMembers.size()) {
+                // Some of the new members are not registered on Signal
+                for (ContactTokenDetails contact : contacts) {
+                    newMembers.remove(contact.getNumber());
+                }
+                System.err.println("Failed to add members " + join(", ", newMembers) + " to group: Not registered on Signal");
+                System.err.println("Aborting…");
+                System.exit(1);
+            }
+        }
+
+        if (avatarFile != null) {
+            createPrivateDirectories(avatarsPath);
+            File aFile = getGroupAvatarFile(g.groupId);
+            Files.copy(Paths.get(avatarFile), aFile.toPath(), StandardCopyOption.REPLACE_EXISTING);

         }
 
         }
 

+        groupStore.updateGroup(g);
+
+        SignalServiceDataMessage.Builder messageBuilder = getGroupUpdateMessageBuilder(g);
+
+        // Don't send group message to ourself
+        final List<String> membersSend = new ArrayList<>(g.members);
+        membersSend.remove(this.username);
+        sendMessage(messageBuilder, membersSend);
+        return g.groupId;
+    }
+
+    private void sendUpdateGroupMessage(byte[] groupId, String recipient) throws IOException, EncapsulatedExceptions {
+        if (groupId == null) {
+            return;
+        }
+        GroupInfo g = getGroupForSending(groupId);
+
+        if (!g.members.contains(recipient)) {
+            return;
+        }
+
+        SignalServiceDataMessage.Builder messageBuilder = getGroupUpdateMessageBuilder(g);
+
+        // Send group message only to the recipient who requested it
+        final List<String> membersSend = new ArrayList<>();
+        membersSend.add(recipient);
+        sendMessage(messageBuilder, membersSend);
+    }
+
+    private SignalServiceDataMessage.Builder getGroupUpdateMessageBuilder(GroupInfo g) {

         SignalServiceGroup.Builder group = SignalServiceGroup.newBuilder(SignalServiceGroup.Type.UPDATE)
                 .withId(g.groupId)
                 .withName(g.name)
                 .withMembers(new ArrayList<>(g.members));
 
         File aFile = getGroupAvatarFile(g.groupId);
         SignalServiceGroup.Builder group = SignalServiceGroup.newBuilder(SignalServiceGroup.Type.UPDATE)
                 .withId(g.groupId)
                 .withName(g.name)
                 .withMembers(new ArrayList<>(g.members));
 
         File aFile = getGroupAvatarFile(g.groupId);

-        if (avatarFile != null) {
-            new File(avatarsPath).mkdirs();
-            Files.copy(Paths.get(avatarFile), aFile.toPath(), StandardCopyOption.REPLACE_EXISTING);
-        }

         if (aFile.exists()) {
             try {
                 group.withAvatar(createAttachment(aFile));
             } catch (IOException e) {
         if (aFile.exists()) {
             try {
                 group.withAvatar(createAttachment(aFile));
             } catch (IOException e) {

-                throw new AttachmentInvalidException(avatarFile, e);
+                throw new AttachmentInvalidException(aFile.toString(), e);

             }
         }
 
             }
         }
 

-        groupStore.updateGroup(g);
+        return SignalServiceDataMessage.newBuilder()
+                .asGroupMessage(group.build());
+    }

 
 

-        SignalServiceDataMessage message = SignalServiceDataMessage.newBuilder()
-                .asGroupMessage(group.build())
-                .build();
+    private void sendGroupInfoRequest(byte[] groupId, String recipient) throws IOException, EncapsulatedExceptions {
+        if (groupId == null) {
+            return;
+        }

 
 

-        // Don't send group message to ourself
-        final List<String> membersSend = new ArrayList<>(g.members);
-        membersSend.remove(this.username);
-        sendMessage(message, membersSend);
-        return g.groupId;
+        SignalServiceGroup.Builder group = SignalServiceGroup.newBuilder(SignalServiceGroup.Type.REQUEST_INFO)
+                .withId(groupId);
+
+        SignalServiceDataMessage.Builder messageBuilder = SignalServiceDataMessage.newBuilder()
+                .asGroupMessage(group.build());
+
+        // Send group info request message to the recipient who sent us a message with this groupId
+        final List<String> membersSend = new ArrayList<>();
+        membersSend.add(recipient);
+        sendMessage(messageBuilder, membersSend);

     }
 
     @Override
     }
 
     @Override


@@ -609,25 +780,84 @@ class Manager implements Signal {
         if (attachments != null) {
             messageBuilder.withAttachments(getSignalServiceAttachments(attachments));
         }
         if (attachments != null) {
             messageBuilder.withAttachments(getSignalServiceAttachments(attachments));
         }

-        SignalServiceDataMessage message = messageBuilder.build();
-
-        sendMessage(message, recipients);
+        sendMessage(messageBuilder, recipients);

     }
 
     @Override
     public void sendEndSessionMessage(List<String> recipients) throws IOException, EncapsulatedExceptions {
     }
 
     @Override
     public void sendEndSessionMessage(List<String> recipients) throws IOException, EncapsulatedExceptions {

-        SignalServiceDataMessage message = SignalServiceDataMessage.newBuilder()
-                .asEndSessionMessage()
-                .build();
+        SignalServiceDataMessage.Builder messageBuilder = SignalServiceDataMessage.newBuilder()
+                .asEndSessionMessage();
+
+        sendMessage(messageBuilder, recipients);
+    }
+
+    @Override
+    public String getContactName(String number) {
+        ContactInfo contact = contactStore.getContact(number);
+        if (contact == null) {
+            return "";
+        } else {
+            return contact.name;
+        }
+    }

 
 

-        sendMessage(message, recipients);
+    @Override
+    public void setContactName(String number, String name) {
+        ContactInfo contact = contactStore.getContact(number);
+        if (contact == null) {
+            contact = new ContactInfo();
+            contact.number = number;
+            System.err.println("Add contact " + number + " named " + name);
+        } else {
+            System.err.println("Updating contact " + number + " name " + contact.name + " -> " + name);
+        }
+        contact.name = name;
+        contactStore.updateContact(contact);
+        save();
+    }
+
+    @Override
+    public String getGroupName(byte[] groupId) {
+        GroupInfo group = getGroup(groupId);
+        if (group == null) {
+            return "";
+        } else {
+            return group.name;
+        }
+    }
+
+    @Override
+    public List<String> getGroupMembers(byte[] groupId) {
+        GroupInfo group = getGroup(groupId);
+        if (group == null) {
+            return new ArrayList<String>();
+        } else {
+            return new ArrayList<String>(group.members);
+        }
+    }
+
+    @Override
+    public byte[] updateGroup(byte[] groupId, String name, List<String> members, String avatar) throws IOException, EncapsulatedExceptions, GroupNotFoundException, AttachmentInvalidException {
+        if (groupId.length == 0) {
+            groupId = null;
+        }
+        if (name.isEmpty()) {
+            name = null;
+        }
+        if (members.size() == 0) {
+            members = null;
+        }
+        if (avatar.isEmpty()) {
+            avatar = null;
+        }
+        return sendUpdateGroupMessage(groupId, name, members, avatar);

     }
 
     private void requestSyncGroups() throws IOException {
         SignalServiceProtos.SyncMessage.Request r = SignalServiceProtos.SyncMessage.Request.newBuilder().setType(SignalServiceProtos.SyncMessage.Request.Type.GROUPS).build();
         SignalServiceSyncMessage message = SignalServiceSyncMessage.forRequest(new RequestMessage(r));
         try {
     }
 
     private void requestSyncGroups() throws IOException {
         SignalServiceProtos.SyncMessage.Request r = SignalServiceProtos.SyncMessage.Request.newBuilder().setType(SignalServiceProtos.SyncMessage.Request.Type.GROUPS).build();
         SignalServiceSyncMessage message = SignalServiceSyncMessage.forRequest(new RequestMessage(r));
         try {

-            sendMessage(message);
+            sendSyncMessage(message);

         } catch (UntrustedIdentityException e) {
             e.printStackTrace();
         }
         } catch (UntrustedIdentityException e) {
             e.printStackTrace();
         }


@@ -637,16 +867,16 @@ class Manager implements Signal {
         SignalServiceProtos.SyncMessage.Request r = SignalServiceProtos.SyncMessage.Request.newBuilder().setType(SignalServiceProtos.SyncMessage.Request.Type.CONTACTS).build();
         SignalServiceSyncMessage message = SignalServiceSyncMessage.forRequest(new RequestMessage(r));
         try {
         SignalServiceProtos.SyncMessage.Request r = SignalServiceProtos.SyncMessage.Request.newBuilder().setType(SignalServiceProtos.SyncMessage.Request.Type.CONTACTS).build();
         SignalServiceSyncMessage message = SignalServiceSyncMessage.forRequest(new RequestMessage(r));
         try {

-            sendMessage(message);
+            sendSyncMessage(message);

         } catch (UntrustedIdentityException e) {
             e.printStackTrace();
         }
     }
 
         } catch (UntrustedIdentityException e) {
             e.printStackTrace();
         }
     }
 

-    private void sendMessage(SignalServiceSyncMessage message)
+    private void sendSyncMessage(SignalServiceSyncMessage message)

             throws IOException, UntrustedIdentityException {
             throws IOException, UntrustedIdentityException {

-        SignalServiceMessageSender messageSender = new SignalServiceMessageSender(URL, TRUST_STORE, username, password,
-                deviceId, signalProtocolStore, USER_AGENT, Optional.<SignalServiceMessageSender.EventListener>absent());
+        SignalServiceMessageSender messageSender = new SignalServiceMessageSender(serviceUrls, username, password,
+                deviceId, signalProtocolStore, USER_AGENT, Optional.fromNullable(messagePipe), Optional.<SignalServiceMessageSender.EventListener>absent());

         try {
             messageSender.sendMessage(message);
         } catch (UntrustedIdentityException e) {
         try {
             messageSender.sendMessage(message);
         } catch (UntrustedIdentityException e) {


@@ -655,24 +885,17 @@ class Manager implements Signal {
         }
     }
 
         }
     }
 

-    private void sendMessage(SignalServiceDataMessage message, Collection<String> recipients)
+    private void sendMessage(SignalServiceDataMessage.Builder messageBuilder, Collection<String> recipients)

             throws EncapsulatedExceptions, IOException {
             throws EncapsulatedExceptions, IOException {

-        Set<SignalServiceAddress> recipientsTS = new HashSet<>(recipients.size());
-        for (String recipient : recipients) {
-            try {
-                recipientsTS.add(getPushAddress(recipient));
-            } catch (InvalidNumberException e) {
-                System.err.println("Failed to add recipient \"" + recipient + "\": " + e.getMessage());
-                System.err.println("Aborting sending.");
-                save();
-                return;
-            }
-        }
+        Set<SignalServiceAddress> recipientsTS = getSignalServiceAddresses(recipients);
+        if (recipientsTS == null) return;

 
 

+        SignalServiceDataMessage message = null;

         try {
         try {

-            SignalServiceMessageSender messageSender = new SignalServiceMessageSender(URL, TRUST_STORE, username, password,
-                    deviceId, signalProtocolStore, USER_AGENT, Optional.<SignalServiceMessageSender.EventListener>absent());
+            SignalServiceMessageSender messageSender = new SignalServiceMessageSender(serviceUrls, username, password,
+                    deviceId, signalProtocolStore, USER_AGENT, Optional.fromNullable(messagePipe), Optional.<SignalServiceMessageSender.EventListener>absent());

 
 

+            message = messageBuilder.build();

             if (message.getGroupInfo().isPresent()) {
                 try {
                     messageSender.sendMessage(new ArrayList<>(recipientsTS), message);
             if (message.getGroupInfo().isPresent()) {
                 try {
                     messageSender.sendMessage(new ArrayList<>(recipientsTS), message);


@@ -687,6 +910,13 @@ class Manager implements Signal {
                 List<UnregisteredUserException> unregisteredUsers = new LinkedList<>();
                 List<NetworkFailureException> networkExceptions = new LinkedList<>();
                 for (SignalServiceAddress address : recipientsTS) {
                 List<UnregisteredUserException> unregisteredUsers = new LinkedList<>();
                 List<NetworkFailureException> networkExceptions = new LinkedList<>();
                 for (SignalServiceAddress address : recipientsTS) {

+                    ThreadInfo thread = threadStore.getThread(address.getNumber());
+                    if (thread != null) {
+                        messageBuilder.withExpiration(thread.messageExpirationTime);
+                    } else {
+                        messageBuilder.withExpiration(0);
+                    }
+                    message = messageBuilder.build();

                     try {
                         messageSender.sendMessage(address, message);
                     } catch (UntrustedIdentityException e) {
                     try {
                         messageSender.sendMessage(address, message);
                     } catch (UntrustedIdentityException e) {


@@ -703,7 +933,7 @@ class Manager implements Signal {
                 }
             }
         } finally {
                 }
             }
         } finally {

-            if (message.isEndSession()) {
+            if (message != null && message.isEndSession()) {

                 for (SignalServiceAddress recipient : recipientsTS) {
                     handleEndSession(recipient.getNumber());
                 }
                 for (SignalServiceAddress recipient : recipientsTS) {
                     handleEndSession(recipient.getNumber());
                 }


@@ -712,16 +942,28 @@ class Manager implements Signal {
         }
     }
 
         }
     }
 

+    private Set<SignalServiceAddress> getSignalServiceAddresses(Collection<String> recipients) {
+        Set<SignalServiceAddress> recipientsTS = new HashSet<>(recipients.size());
+        for (String recipient : recipients) {
+            try {
+                recipientsTS.add(getPushAddress(recipient));
+            } catch (InvalidNumberException e) {
+                System.err.println("Failed to add recipient \"" + recipient + "\": " + e.getMessage());
+                System.err.println("Aborting sending.");
+                save();
+                return null;
+            }
+        }
+        return recipientsTS;
+    }
+

     private SignalServiceContent decryptMessage(SignalServiceEnvelope envelope) throws NoSessionException, LegacyMessageException, InvalidVersionException, InvalidMessageException, DuplicateMessageException, InvalidKeyException, InvalidKeyIdException, org.whispersystems.libsignal.UntrustedIdentityException {
         SignalServiceCipher cipher = new SignalServiceCipher(new SignalServiceAddress(username), signalProtocolStore);
         try {
             return cipher.decrypt(envelope);
         } catch (org.whispersystems.libsignal.UntrustedIdentityException e) {
     private SignalServiceContent decryptMessage(SignalServiceEnvelope envelope) throws NoSessionException, LegacyMessageException, InvalidVersionException, InvalidMessageException, DuplicateMessageException, InvalidKeyException, InvalidKeyIdException, org.whispersystems.libsignal.UntrustedIdentityException {
         SignalServiceCipher cipher = new SignalServiceCipher(new SignalServiceAddress(username), signalProtocolStore);
         try {
             return cipher.decrypt(envelope);
         } catch (org.whispersystems.libsignal.UntrustedIdentityException e) {

-            // TODO temporarily store message, until user has accepted the key

             signalProtocolStore.saveIdentity(e.getName(), e.getUntrustedIdentity(), TrustLevel.UNTRUSTED);
             throw e;
             signalProtocolStore.saveIdentity(e.getName(), e.getUntrustedIdentity(), TrustLevel.UNTRUSTED);
             throw e;

-        } catch (Exception e) {
-            throw e;

         }
     }
 
         }
     }
 


@@ -730,16 +972,17 @@ class Manager implements Signal {
     }
 
     public interface ReceiveMessageHandler {
     }
 
     public interface ReceiveMessageHandler {

-        void handleMessage(SignalServiceEnvelope envelope, SignalServiceContent decryptedContent);
+        void handleMessage(SignalServiceEnvelope envelope, SignalServiceContent decryptedContent, Throwable e);

     }
 
     }
 

-    private void handleSignalServiceDataMessage(SignalServiceDataMessage message, boolean isSync, String source, String destination) {
+    private void handleSignalServiceDataMessage(SignalServiceDataMessage message, boolean isSync, String source, String destination, boolean ignoreAttachments) {
+        String threadId;

         if (message.getGroupInfo().isPresent()) {
             SignalServiceGroup groupInfo = message.getGroupInfo().get();
         if (message.getGroupInfo().isPresent()) {
             SignalServiceGroup groupInfo = message.getGroupInfo().get();

+            threadId = Base64.encodeBytes(groupInfo.getGroupId());
+            GroupInfo group = groupStore.getGroup(groupInfo.getGroupId());

             switch (groupInfo.getType()) {
                 case UPDATE:
             switch (groupInfo.getType()) {
                 case UPDATE:

-                    GroupInfo group;
-                    group = groupStore.getGroup(groupInfo.getGroupId());

                     if (group == null) {
                         group = new GroupInfo(groupInfo.getGroupId());
                     }
                     if (group == null) {
                         group = new GroupInfo(groupInfo.getGroupId());
                     }


@@ -766,20 +1009,60 @@ class Manager implements Signal {
                     groupStore.updateGroup(group);
                     break;
                 case DELIVER:
                     groupStore.updateGroup(group);
                     break;
                 case DELIVER:

+                    if (group == null) {
+                        try {
+                            sendGroupInfoRequest(groupInfo.getGroupId(), source);
+                        } catch (IOException | EncapsulatedExceptions e) {
+                            e.printStackTrace();
+                        }
+                    }

                     break;
                 case QUIT:
                     break;
                 case QUIT:

-                    group = groupStore.getGroup(groupInfo.getGroupId());
-                    if (group != null) {
+                    if (group == null) {
+                        try {
+                            sendGroupInfoRequest(groupInfo.getGroupId(), source);
+                        } catch (IOException | EncapsulatedExceptions e) {
+                            e.printStackTrace();
+                        }
+                    } else {

                         group.members.remove(source);
                         groupStore.updateGroup(group);
                     }
                     break;
                         group.members.remove(source);
                         groupStore.updateGroup(group);
                     }
                     break;

+                case REQUEST_INFO:
+                    if (group != null) {
+                        try {
+                            sendUpdateGroupMessage(groupInfo.getGroupId(), source);
+                        } catch (IOException | EncapsulatedExceptions e) {
+                            e.printStackTrace();
+                        } catch (NotAGroupMemberException e) {
+                            // We have left this group, so don't send a group update message
+                        }
+                    }
+                    break;
+            }
+        } else {
+            if (isSync) {
+                threadId = destination;
+            } else {
+                threadId = source;

             }
         }
         if (message.isEndSession()) {
             handleEndSession(isSync ? destination : source);
         }
             }
         }
         if (message.isEndSession()) {
             handleEndSession(isSync ? destination : source);
         }

-        if (message.getAttachments().isPresent()) {
+        if (message.isExpirationUpdate() || message.getBody().isPresent()) {
+            ThreadInfo thread = threadStore.getThread(threadId);
+            if (thread == null) {
+                thread = new ThreadInfo();
+                thread.id = threadId;
+            }
+            if (thread.messageExpirationTime != message.getExpiresInSeconds()) {
+                thread.messageExpirationTime = message.getExpiresInSeconds();
+                threadStore.updateThread(thread);
+            }
+        }
+        if (message.getAttachments().isPresent() && !ignoreAttachments) {

             for (SignalServiceAttachment attachment : message.getAttachments().get()) {
                 if (attachment.isPointer()) {
                     try {
             for (SignalServiceAttachment attachment : message.getAttachments().get()) {
                 if (attachment.isPointer()) {
                     try {


@@ -792,114 +1075,288 @@ class Manager implements Signal {
         }
     }
 
         }
     }
 

-    public void receiveMessages(int timeoutSeconds, boolean returnOnTimeout, ReceiveMessageHandler handler) throws IOException {
-        final SignalServiceMessageReceiver messageReceiver = new SignalServiceMessageReceiver(URL, TRUST_STORE, username, password, deviceId, signalingKey, USER_AGENT);
-        SignalServiceMessagePipe messagePipe = null;
+    public void retryFailedReceivedMessages(ReceiveMessageHandler handler, boolean ignoreAttachments) {
+        final File cachePath = new File(getMessageCachePath());
+        if (!cachePath.exists()) {
+            return;
+        }
+        for (final File dir : cachePath.listFiles()) {
+            if (!dir.isDirectory()) {
+                continue;
+            }
+
+            for (final File fileEntry : dir.listFiles()) {
+                if (!fileEntry.isFile()) {
+                    continue;
+                }
+                SignalServiceEnvelope envelope;
+                try {
+                    envelope = loadEnvelope(fileEntry);
+                    if (envelope == null) {
+                        continue;
+                    }
+                } catch (IOException e) {
+                    e.printStackTrace();
+                    continue;
+                }
+                SignalServiceContent content = null;
+                if (!envelope.isReceipt()) {
+                    try {
+                        content = decryptMessage(envelope);
+                    } catch (Exception e) {
+                        continue;
+                    }
+                    handleMessage(envelope, content, ignoreAttachments);
+                }
+                save();
+                handler.handleMessage(envelope, content, null);
+                try {
+                    Files.delete(fileEntry.toPath());
+                } catch (IOException e) {
+                    System.err.println("Failed to delete cached message file “" + fileEntry + "”: " + e.getMessage());
+                }
+            }
+            // Try to delete directory if empty
+            dir.delete();
+        }
+    }
+
+    public void receiveMessages(long timeout, TimeUnit unit, boolean returnOnTimeout, boolean ignoreAttachments, ReceiveMessageHandler handler) throws IOException {
+        retryFailedReceivedMessages(handler, ignoreAttachments);
+        final SignalServiceMessageReceiver messageReceiver = new SignalServiceMessageReceiver(serviceUrls, username, password, deviceId, signalingKey, USER_AGENT);

 
         try {
 
         try {

-            messagePipe = messageReceiver.createMessagePipe();
+            if (messagePipe == null) {
+                messagePipe = messageReceiver.createMessagePipe();
+            }

 
             while (true) {
                 SignalServiceEnvelope envelope;
                 SignalServiceContent content = null;
 
             while (true) {
                 SignalServiceEnvelope envelope;
                 SignalServiceContent content = null;

+                Exception exception = null;
+                final long now = new Date().getTime();

                 try {
                 try {

-                    envelope = messagePipe.read(timeoutSeconds, TimeUnit.SECONDS);
-                    if (!envelope.isReceipt()) {
-                        Exception exception;
+                    envelope = messagePipe.read(timeout, unit, new SignalServiceMessagePipe.MessagePipeCallback() {
+                        @Override
+                        public void onMessage(SignalServiceEnvelope envelope) {
+                            // store message on disk, before acknowledging receipt to the server
+                            try {
+                                File cacheFile = getMessageCacheFile(envelope.getSource(), now, envelope.getTimestamp());
+                                storeEnvelope(envelope, cacheFile);
+                            } catch (IOException e) {
+                                System.err.println("Failed to store encrypted message in disk cache, ignoring: " + e.getMessage());
+                            }
+                        }
+                    });
+                } catch (TimeoutException e) {
+                    if (returnOnTimeout)
+                        return;
+                    continue;
+                } catch (InvalidVersionException e) {
+                    System.err.println("Ignoring error: " + e.getMessage());
+                    continue;
+                }
+                if (!envelope.isReceipt()) {
+                    try {
+                        content = decryptMessage(envelope);
+                    } catch (Exception e) {
+                        exception = e;
+                    }
+                    handleMessage(envelope, content, ignoreAttachments);
+                }
+                save();
+                handler.handleMessage(envelope, content, exception);
+                if (exception == null || !(exception instanceof org.whispersystems.libsignal.UntrustedIdentityException)) {
+                    File cacheFile = null;
+                    try {
+                        cacheFile = getMessageCacheFile(envelope.getSource(), now, envelope.getTimestamp());
+                        Files.delete(cacheFile.toPath());
+                        // Try to delete directory if empty
+                        new File(getMessageCachePath()).delete();
+                    } catch (IOException e) {
+                        System.err.println("Failed to delete cached message file “" + cacheFile + "”: " + e.getMessage());
+                    }
+                }
+            }
+        } finally {
+            if (messagePipe != null) {
+                messagePipe.shutdown();
+                messagePipe = null;
+            }
+        }
+    }
+
+    private void handleMessage(SignalServiceEnvelope envelope, SignalServiceContent content, boolean ignoreAttachments) {
+        if (content != null) {
+            if (content.getDataMessage().isPresent()) {
+                SignalServiceDataMessage message = content.getDataMessage().get();
+                handleSignalServiceDataMessage(message, false, envelope.getSource(), username, ignoreAttachments);
+            }
+            if (content.getSyncMessage().isPresent()) {
+                SignalServiceSyncMessage syncMessage = content.getSyncMessage().get();
+                if (syncMessage.getSent().isPresent()) {
+                    SignalServiceDataMessage message = syncMessage.getSent().get().getMessage();
+                    handleSignalServiceDataMessage(message, true, envelope.getSource(), syncMessage.getSent().get().getDestination().get(), ignoreAttachments);
+                }
+                if (syncMessage.getRequest().isPresent()) {
+                    RequestMessage rm = syncMessage.getRequest().get();
+                    if (rm.isContactsRequest()) {
+                        try {
+                            sendContacts();
+                            sendVerifiedMessage();
+                        } catch (UntrustedIdentityException | IOException e) {
+                            e.printStackTrace();
+                        }
+                    }
+                    if (rm.isGroupsRequest()) {

                         try {
                         try {

-                            content = decryptMessage(envelope);
-                        } catch (Exception e) {
-                            exception = e;
-                            // TODO pass exception to handler instead
+                            sendGroups();
+                        } catch (UntrustedIdentityException | IOException e) {

                             e.printStackTrace();
                         }
                             e.printStackTrace();
                         }

-                        if (content != null) {
-                            if (content.getDataMessage().isPresent()) {
-                                SignalServiceDataMessage message = content.getDataMessage().get();
-                                handleSignalServiceDataMessage(message, false, envelope.getSource(), username);
+                    }
+                }
+                if (syncMessage.getGroups().isPresent()) {
+                    File tmpFile = null;
+                    try {
+                        tmpFile = Util.createTempFile();
+                        try (InputStream attachmentAsStream = retrieveAttachmentAsStream(syncMessage.getGroups().get().asPointer(), tmpFile)) {
+                            DeviceGroupsInputStream s = new DeviceGroupsInputStream(attachmentAsStream);
+                            DeviceGroup g;
+                            while ((g = s.read()) != null) {
+                                GroupInfo syncGroup = groupStore.getGroup(g.getId());
+                                if (syncGroup == null) {
+                                    syncGroup = new GroupInfo(g.getId());
+                                }
+                                if (g.getName().isPresent()) {
+                                    syncGroup.name = g.getName().get();
+                                }
+                                syncGroup.members.addAll(g.getMembers());
+                                syncGroup.active = g.isActive();
+
+                                if (g.getAvatar().isPresent()) {
+                                    retrieveGroupAvatarAttachment(g.getAvatar().get(), syncGroup.groupId);
+                                }
+                                groupStore.updateGroup(syncGroup);
+                            }
+                        }
+                    } catch (Exception e) {
+                        e.printStackTrace();
+                    } finally {
+                        if (tmpFile != null) {
+                            try {
+                                Files.delete(tmpFile.toPath());
+                            } catch (IOException e) {
+                                System.err.println("Failed to delete received groups temp file “" + tmpFile + "”: " + e.getMessage());

                             }
                             }

-                            if (content.getSyncMessage().isPresent()) {
-                                SignalServiceSyncMessage syncMessage = content.getSyncMessage().get();
-                                if (syncMessage.getSent().isPresent()) {
-                                    SignalServiceDataMessage message = syncMessage.getSent().get().getMessage();
-                                    handleSignalServiceDataMessage(message, true, envelope.getSource(), syncMessage.getSent().get().getDestination().get());
+                        }
+                    }
+                    if (syncMessage.getBlockedList().isPresent()) {
+                        // TODO store list of blocked numbers
+                    }
+                }
+                if (syncMessage.getContacts().isPresent()) {
+                    File tmpFile = null;
+                    try {
+                        tmpFile = Util.createTempFile();
+                        final ContactsMessage contactsMessage = syncMessage.getContacts().get();
+                        try (InputStream attachmentAsStream = retrieveAttachmentAsStream(contactsMessage.getContactsStream().asPointer(), tmpFile)) {
+                            DeviceContactsInputStream s = new DeviceContactsInputStream(attachmentAsStream);
+                            if (contactsMessage.isComplete()) {
+                                contactStore.clear();
+                            }
+                            DeviceContact c;
+                            while ((c = s.read()) != null) {
+                                ContactInfo contact = contactStore.getContact(c.getNumber());
+                                if (contact == null) {
+                                    contact = new ContactInfo();
+                                    contact.number = c.getNumber();

                                 }
                                 }

-                                if (syncMessage.getRequest().isPresent()) {
-                                    RequestMessage rm = syncMessage.getRequest().get();
-                                    if (rm.isContactsRequest()) {
-                                        try {
-                                            sendContacts();
-                                        } catch (UntrustedIdentityException e) {
-                                            e.printStackTrace();
-                                        }
-                                    }
-                                    if (rm.isGroupsRequest()) {
-                                        try {
-                                            sendGroups();
-                                        } catch (UntrustedIdentityException e) {
-                                            e.printStackTrace();
-                                        }
-                                    }
+                                if (c.getName().isPresent()) {
+                                    contact.name = c.getName().get();

                                 }
                                 }

-                                if (syncMessage.getGroups().isPresent()) {
-                                    try {
-                                        DeviceGroupsInputStream s = new DeviceGroupsInputStream(retrieveAttachmentAsStream(syncMessage.getGroups().get().asPointer()));
-                                        DeviceGroup g;
-                                        while ((g = s.read()) != null) {
-                                            GroupInfo syncGroup = groupStore.getGroup(g.getId());
-                                            if (syncGroup == null) {
-                                                syncGroup = new GroupInfo(g.getId());
-                                            }
-                                            if (g.getName().isPresent()) {
-                                                syncGroup.name = g.getName().get();
-                                            }
-                                            syncGroup.members.addAll(g.getMembers());
-                                            syncGroup.active = g.isActive();
-
-                                            if (g.getAvatar().isPresent()) {
-                                                retrieveGroupAvatarAttachment(g.getAvatar().get(), syncGroup.groupId);
-                                            }
-                                            groupStore.updateGroup(syncGroup);
-                                        }
-                                    } catch (Exception e) {
-                                        e.printStackTrace();
-                                    }
+                                if (c.getColor().isPresent()) {
+                                    contact.color = c.getColor().get();

                                 }
                                 }

-                                if (syncMessage.getContacts().isPresent()) {
-                                    try {
-                                        DeviceContactsInputStream s = new DeviceContactsInputStream(retrieveAttachmentAsStream(syncMessage.getContacts().get().asPointer()));
-                                        DeviceContact c;
-                                        while ((c = s.read()) != null) {
-                                            ContactInfo contact = new ContactInfo();
-                                            contact.number = c.getNumber();
-                                            if (c.getName().isPresent()) {
-                                                contact.name = c.getName().get();
-                                            }
-                                            contactStore.updateContact(contact);
-
-                                            if (c.getAvatar().isPresent()) {
-                                                retrieveContactAvatarAttachment(c.getAvatar().get(), contact.number);
-                                            }
-                                        }
-                                    } catch (Exception e) {
-                                        e.printStackTrace();
-                                    }
+                                contactStore.updateContact(contact);
+
+                                if (c.getAvatar().isPresent()) {
+                                    retrieveContactAvatarAttachment(c.getAvatar().get(), contact.number);

                                 }
                             }
                         }
                                 }
                             }
                         }

+                    } catch (Exception e) {
+                        e.printStackTrace();
+                    } finally {
+                        if (tmpFile != null) {
+                            try {
+                                Files.delete(tmpFile.toPath());
+                            } catch (IOException e) {
+                                System.err.println("Failed to delete received contacts temp file “" + tmpFile + "”: " + e.getMessage());
+                            }
+                        }
+                    }
+                }
+                if (syncMessage.getVerified().isPresent()) {
+                    final List<VerifiedMessage> verifiedList = syncMessage.getVerified().get();
+                    for (VerifiedMessage v : verifiedList) {
+                        signalProtocolStore.saveIdentity(v.getDestination(), v.getIdentityKey(), TrustLevel.fromVerifiedState(v.getVerified()));

                     }
                     }

-                    save();
-                    handler.handleMessage(envelope, content);
-                } catch (TimeoutException e) {
-                    if (returnOnTimeout)
-                        return;
-                } catch (InvalidVersionException e) {
-                    System.err.println("Ignoring error: " + e.getMessage());

                 }
             }
                 }
             }

-        } finally {
-            if (messagePipe != null)
-                messagePipe.shutdown();
+        }
+    }
+
+    private SignalServiceEnvelope loadEnvelope(File file) throws IOException {
+        try (FileInputStream f = new FileInputStream(file)) {
+            DataInputStream in = new DataInputStream(f);
+            int version = in.readInt();
+            if (version != 1) {
+                return null;
+            }
+            int type = in.readInt();
+            String source = in.readUTF();
+            int sourceDevice = in.readInt();
+            String relay = in.readUTF();
+            long timestamp = in.readLong();
+            byte[] content = null;
+            int contentLen = in.readInt();
+            if (contentLen > 0) {
+                content = new byte[contentLen];
+                in.readFully(content);
+            }
+            byte[] legacyMessage = null;
+            int legacyMessageLen = in.readInt();
+            if (legacyMessageLen > 0) {
+                legacyMessage = new byte[legacyMessageLen];
+                in.readFully(legacyMessage);
+            }
+            return new SignalServiceEnvelope(type, source, sourceDevice, relay, timestamp, legacyMessage, content);
+        }
+    }
+
+    private void storeEnvelope(SignalServiceEnvelope envelope, File file) throws IOException {
+        try (FileOutputStream f = new FileOutputStream(file)) {
+            try (DataOutputStream out = new DataOutputStream(f)) {
+                out.writeInt(1); // version
+                out.writeInt(envelope.getType());
+                out.writeUTF(envelope.getSource());
+                out.writeInt(envelope.getSourceDevice());
+                out.writeUTF(envelope.getRelay());
+                out.writeLong(envelope.getTimestamp());
+                if (envelope.hasContent()) {
+                    out.writeInt(envelope.getContent().length);
+                    out.write(envelope.getContent());
+                } else {
+                    out.writeInt(0);
+                }
+                if (envelope.hasLegacyMessage()) {
+                    out.writeInt(envelope.getLegacyMessage().length);
+                    out.write(envelope.getLegacyMessage());
+                } else {
+                    out.writeInt(0);
+                }
+            }

         }
     }
 
         }
     }
 


@@ -908,7 +1365,7 @@ class Manager implements Signal {
     }
 
     private File retrieveContactAvatarAttachment(SignalServiceAttachment attachment, String number) throws IOException, InvalidMessageException {
     }
 
     private File retrieveContactAvatarAttachment(SignalServiceAttachment attachment, String number) throws IOException, InvalidMessageException {

-        new File(avatarsPath).mkdirs();
+        createPrivateDirectories(avatarsPath);

         if (attachment.isPointer()) {
             SignalServiceAttachmentPointer pointer = attachment.asPointer();
             return retrieveAttachment(pointer, getContactAvatarFile(number), false);
         if (attachment.isPointer()) {
             SignalServiceAttachmentPointer pointer = attachment.asPointer();
             return retrieveAttachment(pointer, getContactAvatarFile(number), false);


@@ -923,7 +1380,7 @@ class Manager implements Signal {
     }
 
     private File retrieveGroupAvatarAttachment(SignalServiceAttachment attachment, byte[] groupId) throws IOException, InvalidMessageException {
     }
 
     private File retrieveGroupAvatarAttachment(SignalServiceAttachment attachment, byte[] groupId) throws IOException, InvalidMessageException {

-        new File(avatarsPath).mkdirs();
+        createPrivateDirectories(avatarsPath);

         if (attachment.isPointer()) {
             SignalServiceAttachmentPointer pointer = attachment.asPointer();
             return retrieveAttachment(pointer, getGroupAvatarFile(groupId), false);
         if (attachment.isPointer()) {
             SignalServiceAttachmentPointer pointer = attachment.asPointer();
             return retrieveAttachment(pointer, getGroupAvatarFile(groupId), false);


@@ -938,16 +1395,14 @@ class Manager implements Signal {
     }
 
     private File retrieveAttachment(SignalServiceAttachmentPointer pointer) throws IOException, InvalidMessageException {
     }
 
     private File retrieveAttachment(SignalServiceAttachmentPointer pointer) throws IOException, InvalidMessageException {

-        new File(attachmentsPath).mkdirs();
+        createPrivateDirectories(attachmentsPath);

         return retrieveAttachment(pointer, getAttachmentFile(pointer.getId()), true);
     }
 
     private File retrieveAttachment(SignalServiceAttachmentStream stream, File outputFile) throws IOException, InvalidMessageException {
         InputStream input = stream.getInputStream();
 
         return retrieveAttachment(pointer, getAttachmentFile(pointer.getId()), true);
     }
 
     private File retrieveAttachment(SignalServiceAttachmentStream stream, File outputFile) throws IOException, InvalidMessageException {
         InputStream input = stream.getInputStream();
 

-        OutputStream output = null;
-        try {
-            output = new FileOutputStream(outputFile);
+        try (OutputStream output = new FileOutputStream(outputFile)) {

             byte[] buffer = new byte[4096];
             int read;
 
             byte[] buffer = new byte[4096];
             int read;
 


@@ -957,10 +1412,6 @@ class Manager implements Signal {
         } catch (FileNotFoundException e) {
             e.printStackTrace();
             return null;
         } catch (FileNotFoundException e) {
             e.printStackTrace();
             return null;

-        } finally {
-            if (output != null) {
-                output.close();
-            }

         }
         return outputFile;
     }
         }
         return outputFile;
     }


@@ -968,55 +1419,43 @@ class Manager implements Signal {
     private File retrieveAttachment(SignalServiceAttachmentPointer pointer, File outputFile, boolean storePreview) throws IOException, InvalidMessageException {
         if (storePreview && pointer.getPreview().isPresent()) {
             File previewFile = new File(outputFile + ".preview");
     private File retrieveAttachment(SignalServiceAttachmentPointer pointer, File outputFile, boolean storePreview) throws IOException, InvalidMessageException {
         if (storePreview && pointer.getPreview().isPresent()) {
             File previewFile = new File(outputFile + ".preview");

-            OutputStream output = null;
-            try {
-                output = new FileOutputStream(previewFile);
+            try (OutputStream output = new FileOutputStream(previewFile)) {

                 byte[] preview = pointer.getPreview().get();
                 output.write(preview, 0, preview.length);
             } catch (FileNotFoundException e) {
                 e.printStackTrace();
                 return null;
                 byte[] preview = pointer.getPreview().get();
                 output.write(preview, 0, preview.length);
             } catch (FileNotFoundException e) {
                 e.printStackTrace();
                 return null;

-            } finally {
-                if (output != null) {
-                    output.close();
-                }

             }
         }
 
             }
         }
 

-        final SignalServiceMessageReceiver messageReceiver = new SignalServiceMessageReceiver(URL, TRUST_STORE, username, password, deviceId, signalingKey, USER_AGENT);
-
-        File tmpFile = File.createTempFile("ts_attach_" + pointer.getId(), ".tmp");
-        InputStream input = messageReceiver.retrieveAttachment(pointer, tmpFile);
+        final SignalServiceMessageReceiver messageReceiver = new SignalServiceMessageReceiver(serviceUrls, username, password, deviceId, signalingKey, USER_AGENT);

 
 

-        OutputStream output = null;
-        try {
-            output = new FileOutputStream(outputFile);
-            byte[] buffer = new byte[4096];
-            int read;
+        File tmpFile = Util.createTempFile();
+        try (InputStream input = messageReceiver.retrieveAttachment(pointer, tmpFile, MAX_ATTACHMENT_SIZE)) {
+            try (OutputStream output = new FileOutputStream(outputFile)) {
+                byte[] buffer = new byte[4096];
+                int read;

 
 

-            while ((read = input.read(buffer)) != -1) {
-                output.write(buffer, 0, read);
+                while ((read = input.read(buffer)) != -1) {
+                    output.write(buffer, 0, read);
+                }
+            } catch (FileNotFoundException e) {
+                e.printStackTrace();
+                return null;

             }
             }

-        } catch (FileNotFoundException e) {
-            e.printStackTrace();
-            return null;

         } finally {
         } finally {

-            if (output != null) {
-                output.close();
-            }
-            if (!tmpFile.delete()) {
-                System.err.println("Failed to delete temp file: " + tmpFile);
+            try {
+                Files.delete(tmpFile.toPath());
+            } catch (IOException e) {
+                System.err.println("Failed to delete received attachment temp file “" + tmpFile + "”: " + e.getMessage());

             }
         }
         return outputFile;
     }
 
             }
         }
         return outputFile;
     }
 

-    private InputStream retrieveAttachmentAsStream(SignalServiceAttachmentPointer pointer) throws IOException, InvalidMessageException {
-        final SignalServiceMessageReceiver messageReceiver = new SignalServiceMessageReceiver(URL, TRUST_STORE, username, password, deviceId, signalingKey, USER_AGENT);
-        File file = File.createTempFile("ts_tmp", "tmp");
-        file.deleteOnExit();
-
-        return messageReceiver.retrieveAttachment(pointer, file);
+    private InputStream retrieveAttachmentAsStream(SignalServiceAttachmentPointer pointer, File tmpFile) throws IOException, InvalidMessageException {
+        final SignalServiceMessageReceiver messageReceiver = new SignalServiceMessageReceiver(serviceUrls, username, password, deviceId, signalingKey, USER_AGENT);
+        return messageReceiver.retrieveAttachment(pointer, tmpFile, MAX_ATTACHMENT_SIZE);

     }
 
     private String canonicalizeNumber(String number) throws InvalidNumberException {
     }
 
     private String canonicalizeNumber(String number) throws InvalidNumberException {


@@ -1035,62 +1474,88 @@ class Manager implements Signal {
     }
 
     private void sendGroups() throws IOException, UntrustedIdentityException {
     }
 
     private void sendGroups() throws IOException, UntrustedIdentityException {

-        File groupsFile = File.createTempFile("multidevice-group-update", ".tmp");
+        File groupsFile = Util.createTempFile();

 
         try {
 
         try {

-            DeviceGroupsOutputStream out = new DeviceGroupsOutputStream(new FileOutputStream(groupsFile));
-            try {
+            try (OutputStream fos = new FileOutputStream(groupsFile)) {
+                DeviceGroupsOutputStream out = new DeviceGroupsOutputStream(fos);

                 for (GroupInfo record : groupStore.getGroups()) {
                     out.write(new DeviceGroup(record.groupId, Optional.fromNullable(record.name),
                             new ArrayList<>(record.members), createGroupAvatarAttachment(record.groupId),
                             record.active));
                 }
                 for (GroupInfo record : groupStore.getGroups()) {
                     out.write(new DeviceGroup(record.groupId, Optional.fromNullable(record.name),
                             new ArrayList<>(record.members), createGroupAvatarAttachment(record.groupId),
                             record.active));
                 }

-            } finally {
-                out.close();

             }
 
             if (groupsFile.exists() && groupsFile.length() > 0) {
             }
 
             if (groupsFile.exists() && groupsFile.length() > 0) {

-                FileInputStream contactsFileStream = new FileInputStream(groupsFile);
-                SignalServiceAttachmentStream attachmentStream = SignalServiceAttachment.newStreamBuilder()
-                        .withStream(contactsFileStream)
-                        .withContentType("application/octet-stream")
-                        .withLength(groupsFile.length())
-                        .build();
-
-                sendMessage(SignalServiceSyncMessage.forGroups(attachmentStream));
+                try (FileInputStream groupsFileStream = new FileInputStream(groupsFile)) {
+                    SignalServiceAttachmentStream attachmentStream = SignalServiceAttachment.newStreamBuilder()
+                            .withStream(groupsFileStream)
+                            .withContentType("application/octet-stream")
+                            .withLength(groupsFile.length())
+                            .build();
+
+                    sendSyncMessage(SignalServiceSyncMessage.forGroups(attachmentStream));
+                }

             }
         } finally {
             }
         } finally {

-            groupsFile.delete();
+            try {
+                Files.delete(groupsFile.toPath());
+            } catch (IOException e) {
+                System.err.println("Failed to delete groups temp file “" + groupsFile + "”: " + e.getMessage());
+            }

         }
     }
 
     private void sendContacts() throws IOException, UntrustedIdentityException {
         }
     }
 
     private void sendContacts() throws IOException, UntrustedIdentityException {

-        File contactsFile = File.createTempFile("multidevice-contact-update", ".tmp");
+        File contactsFile = Util.createTempFile();

 
         try {
 
         try {

-            DeviceContactsOutputStream out = new DeviceContactsOutputStream(new FileOutputStream(contactsFile));
-            try {
+            try (OutputStream fos = new FileOutputStream(contactsFile)) {
+                DeviceContactsOutputStream out = new DeviceContactsOutputStream(fos);

                 for (ContactInfo record : contactStore.getContacts()) {
                     out.write(new DeviceContact(record.number, Optional.fromNullable(record.name),
                 for (ContactInfo record : contactStore.getContacts()) {
                     out.write(new DeviceContact(record.number, Optional.fromNullable(record.name),

-                            createContactAvatarAttachment(record.number)));
+                            createContactAvatarAttachment(record.number), Optional.fromNullable(record.color)));

                 }
                 }

-            } finally {
-                out.close();

             }
 
             if (contactsFile.exists() && contactsFile.length() > 0) {
             }
 
             if (contactsFile.exists() && contactsFile.length() > 0) {

-                FileInputStream contactsFileStream = new FileInputStream(contactsFile);
-                SignalServiceAttachmentStream attachmentStream = SignalServiceAttachment.newStreamBuilder()
-                        .withStream(contactsFileStream)
-                        .withContentType("application/octet-stream")
-                        .withLength(contactsFile.length())
-                        .build();
-
-                sendMessage(SignalServiceSyncMessage.forContacts(attachmentStream));
+                try (FileInputStream contactsFileStream = new FileInputStream(contactsFile)) {
+                    SignalServiceAttachmentStream attachmentStream = SignalServiceAttachment.newStreamBuilder()
+                            .withStream(contactsFileStream)
+                            .withContentType("application/octet-stream")
+                            .withLength(contactsFile.length())
+                            .build();
+
+                    sendSyncMessage(SignalServiceSyncMessage.forContacts(new ContactsMessage(attachmentStream, true)));
+                }

             }
         } finally {
             }
         } finally {

-            contactsFile.delete();
+            try {
+                Files.delete(contactsFile.toPath());
+            } catch (IOException e) {
+                System.err.println("Failed to delete contacts temp file “" + contactsFile + "”: " + e.getMessage());
+            }
+        }
+    }
+
+    private void sendVerifiedMessage() throws IOException, UntrustedIdentityException {
+        List<VerifiedMessage> verifiedMessages = new LinkedList<>();
+        for (Map.Entry<String, List<JsonIdentityKeyStore.Identity>> x : getIdentities().entrySet()) {
+            final String name = x.getKey();
+            for (JsonIdentityKeyStore.Identity id : x.getValue()) {
+                if (id.getTrustLevel() == TrustLevel.TRUSTED_UNVERIFIED) {
+                    continue;
+                }
+                VerifiedMessage verifiedMessage = new VerifiedMessage(name, id.getIdentityKey(), id.getTrustLevel().toVerifiedState());
+                verifiedMessages.add(verifiedMessage);
+            }

         }
         }

+        sendSyncMessage(SignalServiceSyncMessage.forVerified(verifiedMessages));
+    }
+
+    private void sendVerifiedMessage(String destination, IdentityKey identityKey, TrustLevel trustLevel) throws IOException, UntrustedIdentityException {
+        VerifiedMessage verifiedMessage = new VerifiedMessage(destination, identityKey, trustLevel.toVerifiedState());
+        sendSyncMessage(SignalServiceSyncMessage.forVerified(verifiedMessage));

     }
 
     public ContactInfo getContact(String number) {
     }
 
     public ContactInfo getContact(String number) {


@@ -1100,4 +1565,97 @@ class Manager implements Signal {
     public GroupInfo getGroup(byte[] groupId) {
         return groupStore.getGroup(groupId);
     }
     public GroupInfo getGroup(byte[] groupId) {
         return groupStore.getGroup(groupId);
     }

+
+    public Map<String, List<JsonIdentityKeyStore.Identity>> getIdentities() {
+        return signalProtocolStore.getIdentities();
+    }
+
+    public List<JsonIdentityKeyStore.Identity> getIdentities(String number) {
+        return signalProtocolStore.getIdentities(number);
+    }
+
+    /**
+     * Trust this the identity with this fingerprint
+     *
+     * @param name        username of the identity
+     * @param fingerprint Fingerprint
+     */
+    public boolean trustIdentityVerified(String name, byte[] fingerprint) {
+        List<JsonIdentityKeyStore.Identity> ids = signalProtocolStore.getIdentities(name);
+        if (ids == null) {
+            return false;
+        }
+        for (JsonIdentityKeyStore.Identity id : ids) {
+            if (!Arrays.equals(id.getIdentityKey().serialize(), fingerprint)) {
+                continue;
+            }
+
+            signalProtocolStore.saveIdentity(name, id.getIdentityKey(), TrustLevel.TRUSTED_VERIFIED);
+            try {
+                sendVerifiedMessage(name, id.getIdentityKey(), TrustLevel.TRUSTED_VERIFIED);
+            } catch (IOException | UntrustedIdentityException e) {
+                e.printStackTrace();
+            }
+            save();
+            return true;
+        }
+        return false;
+    }
+
+    /**
+     * Trust this the identity with this safety number
+     *
+     * @param name         username of the identity
+     * @param safetyNumber Safety number
+     */
+    public boolean trustIdentityVerifiedSafetyNumber(String name, String safetyNumber) {
+        List<JsonIdentityKeyStore.Identity> ids = signalProtocolStore.getIdentities(name);
+        if (ids == null) {
+            return false;
+        }
+        for (JsonIdentityKeyStore.Identity id : ids) {
+            if (!safetyNumber.equals(computeSafetyNumber(name, id.getIdentityKey()))) {
+                continue;
+            }
+
+            signalProtocolStore.saveIdentity(name, id.getIdentityKey(), TrustLevel.TRUSTED_VERIFIED);
+            try {
+                sendVerifiedMessage(name, id.getIdentityKey(), TrustLevel.TRUSTED_VERIFIED);
+            } catch (IOException | UntrustedIdentityException e) {
+                e.printStackTrace();
+            }
+            save();
+            return true;
+        }
+        return false;
+    }
+
+    /**
+     * Trust all keys of this identity without verification
+     *
+     * @param name username of the identity
+     */
+    public boolean trustIdentityAllKeys(String name) {
+        List<JsonIdentityKeyStore.Identity> ids = signalProtocolStore.getIdentities(name);
+        if (ids == null) {
+            return false;
+        }
+        for (JsonIdentityKeyStore.Identity id : ids) {
+            if (id.getTrustLevel() == TrustLevel.UNTRUSTED) {
+                signalProtocolStore.saveIdentity(name, id.getIdentityKey(), TrustLevel.TRUSTED_UNVERIFIED);
+                try {
+                    sendVerifiedMessage(name, id.getIdentityKey(), TrustLevel.TRUSTED_UNVERIFIED);
+                } catch (IOException | UntrustedIdentityException e) {
+                    e.printStackTrace();
+                }
+            }
+        }
+        save();
+        return true;
+    }
+
+    public String computeSafetyNumber(String theirUsername, IdentityKey theirIdentityKey) {
+        Fingerprint fingerprint = new NumericFingerprintGenerator(5200).createFor(username, getIdentity(), theirUsername, theirIdentityKey);
+        return fingerprint.getDisplayableFingerprint().getDisplayText();
+    }

 }
 }