nmode's Git Repositories - signal-cli/blob - src/main/java/org/asamk/signal/Manager.java

   1 /**
   2  * Copyright (C) 2015 AsamK
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17 package org.asamk.signal;
  18
  19 import com.fasterxml.jackson.annotation.JsonAutoDetect;
  20 import com.fasterxml.jackson.annotation.PropertyAccessor;
  21 import com.fasterxml.jackson.databind.DeserializationFeature;
  22 import com.fasterxml.jackson.databind.JsonNode;
  23 import com.fasterxml.jackson.databind.ObjectMapper;
  24 import com.fasterxml.jackson.databind.SerializationFeature;
  25 import com.fasterxml.jackson.databind.node.ObjectNode;
  26 import org.asamk.Signal;
  27 import org.whispersystems.libsignal.*;
  28 import org.whispersystems.libsignal.ecc.Curve;
  29 import org.whispersystems.libsignal.ecc.ECKeyPair;
  30 import org.whispersystems.libsignal.state.PreKeyRecord;
  31 import org.whispersystems.libsignal.state.SignalProtocolStore;
  32 import org.whispersystems.libsignal.state.SignedPreKeyRecord;
  33 import org.whispersystems.libsignal.util.KeyHelper;
  34 import org.whispersystems.libsignal.util.Medium;
  35 import org.whispersystems.libsignal.util.guava.Optional;
  36 import org.whispersystems.signalservice.api.SignalServiceAccountManager;
  37 import org.whispersystems.signalservice.api.SignalServiceMessagePipe;
  38 import org.whispersystems.signalservice.api.SignalServiceMessageReceiver;
  39 import org.whispersystems.signalservice.api.SignalServiceMessageSender;
  40 import org.whispersystems.signalservice.api.crypto.*;
  41 import org.whispersystems.signalservice.api.crypto.UntrustedIdentityException;
  42 import org.whispersystems.signalservice.api.messages.*;
  43 import org.whispersystems.signalservice.api.messages.multidevice.SignalServiceSyncMessage;
  44 import org.whispersystems.signalservice.api.push.SignalServiceAddress;
  45 import org.whispersystems.signalservice.api.push.TrustStore;
  46 import org.whispersystems.signalservice.api.push.exceptions.AuthorizationFailedException;
  47 import org.whispersystems.signalservice.api.push.exceptions.EncapsulatedExceptions;
  48 import org.whispersystems.signalservice.api.util.InvalidNumberException;
  49 import org.whispersystems.signalservice.api.util.PhoneNumberFormatter;
  50
  51 import java.io.*;
  52 import java.net.URI;
  53 import java.net.URISyntaxException;
  54 import java.net.URLEncoder;
  55 import java.nio.file.Files;
  56 import java.nio.file.Paths;
  57 import java.util.*;
  58 import java.util.concurrent.TimeUnit;
  59 import java.util.concurrent.TimeoutException;
  60
  61 class Manager implements Signal {
  62     private final static String URL = "https://textsecure-service.whispersystems.org";
  63     private final static TrustStore TRUST_STORE = new WhisperTrustStore();
  64
  65     public final static String PROJECT_NAME = Manager.class.getPackage().getImplementationTitle();
  66     public final static String PROJECT_VERSION = Manager.class.getPackage().getImplementationVersion();
  67     private final static String USER_AGENT = PROJECT_NAME == null ? null : PROJECT_NAME + " " + PROJECT_VERSION;
  68
  69     private final static int PREKEY_MINIMUM_COUNT = 20;
  70     private static final int PREKEY_BATCH_SIZE = 100;
  71
  72     private final String settingsPath;
  73     private final String dataPath;
  74     private final String attachmentsPath;
  75
  76     private final ObjectMapper jsonProcessot = new ObjectMapper();
  77     private String username;
  78     int deviceId = SignalServiceAddress.DEFAULT_DEVICE_ID;
  79     private String password;
  80     private String signalingKey;
  81     private int preKeyIdOffset;
  82     private int nextSignedPreKeyId;
  83
  84     private boolean registered = false;
  85
  86     private SignalProtocolStore signalProtocolStore;
  87     private SignalServiceAccountManager accountManager;
  88     private JsonGroupStore groupStore;
  89
  90     public Manager(String username, String settingsPath) {
  91         this.username = username;
  92         this.settingsPath = settingsPath;
  93         this.dataPath = this.settingsPath + "/data";
  94         this.attachmentsPath = this.settingsPath + "/attachments";
  95
  96         jsonProcessot.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.NONE); // disable autodetect
  97         jsonProcessot.enable(SerializationFeature.INDENT_OUTPUT); // for pretty print, you can disable it.
  98         jsonProcessot.enable(SerializationFeature.WRITE_NULL_MAP_VALUES);
  99         jsonProcessot.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
 100     }
 101
 102     public String getUsername() {
 103         return username;
 104     }
 105
 106     public String getFileName() {
 107         new File(dataPath).mkdirs();
 108         return dataPath + "/" + username;
 109     }
 110
 111     public boolean userExists() {
 112         if (username == null) {
 113             return false;
 114         }
 115         File f = new File(getFileName());
 116         return !(!f.exists() || f.isDirectory());
 117     }
 118
 119     public boolean userHasKeys() {
 120         return signalProtocolStore != null;
 121     }
 122
 123     private JsonNode getNotNullNode(JsonNode parent, String name) throws InvalidObjectException {
 124         JsonNode node = parent.get(name);
 125         if (node == null) {
 126             throw new InvalidObjectException(String.format("Incorrect file format: expected parameter %s not found ", name));
 127         }
 128
 129         return node;
 130     }
 131
 132     public void load() throws IOException, InvalidKeyException {
 133         JsonNode rootNode = jsonProcessot.readTree(new File(getFileName()));
 134
 135         JsonNode node = rootNode.get("deviceId");
 136         if (node != null) {
 137             deviceId = node.asInt();
 138         }
 139         username = getNotNullNode(rootNode, "username").asText();
 140         password = getNotNullNode(rootNode, "password").asText();
 141         if (rootNode.has("signalingKey")) {
 142             signalingKey = getNotNullNode(rootNode, "signalingKey").asText();
 143         }
 144         if (rootNode.has("preKeyIdOffset")) {
 145             preKeyIdOffset = getNotNullNode(rootNode, "preKeyIdOffset").asInt(0);
 146         } else {
 147             preKeyIdOffset = 0;
 148         }
 149         if (rootNode.has("nextSignedPreKeyId")) {
 150             nextSignedPreKeyId = getNotNullNode(rootNode, "nextSignedPreKeyId").asInt();
 151         } else {
 152             nextSignedPreKeyId = 0;
 153         }
 154         signalProtocolStore = jsonProcessot.convertValue(getNotNullNode(rootNode, "axolotlStore"), JsonSignalProtocolStore.class);
 155         registered = getNotNullNode(rootNode, "registered").asBoolean();
 156         JsonNode groupStoreNode = rootNode.get("groupStore");
 157         if (groupStoreNode != null) {
 158             groupStore = jsonProcessot.convertValue(groupStoreNode, JsonGroupStore.class);
 159         }
 160         if (groupStore == null) {
 161             groupStore = new JsonGroupStore();
 162         }
 163         accountManager = new SignalServiceAccountManager(URL, TRUST_STORE, username, password, deviceId, USER_AGENT);
 164         try {
 165             if (registered && accountManager.getPreKeysCount() < PREKEY_MINIMUM_COUNT) {
 166                 refreshPreKeys();
 167                 save();
 168             }
 169         } catch (AuthorizationFailedException e) {
 170             System.err.println("Authorization failed, was the number registered elsewhere?");
 171         }
 172     }
 173
 174     private void save() {
 175         ObjectNode rootNode = jsonProcessot.createObjectNode();
 176         rootNode.put("username", username)
 177                 .put("deviceId", deviceId)
 178                 .put("password", password)
 179                 .put("signalingKey", signalingKey)
 180                 .put("preKeyIdOffset", preKeyIdOffset)
 181                 .put("nextSignedPreKeyId", nextSignedPreKeyId)
 182                 .put("registered", registered)
 183                 .putPOJO("axolotlStore", signalProtocolStore)
 184                 .putPOJO("groupStore", groupStore)
 185         ;
 186         try {
 187             jsonProcessot.writeValue(new File(getFileName()), rootNode);
 188         } catch (Exception e) {
 189             System.err.println(String.format("Error saving file: %s", e.getMessage()));
 190         }
 191     }
 192
 193     public void createNewIdentity() {
 194         IdentityKeyPair identityKey = KeyHelper.generateIdentityKeyPair();
 195         int registrationId = KeyHelper.generateRegistrationId(false);
 196         signalProtocolStore = new JsonSignalProtocolStore(identityKey, registrationId);
 197         groupStore = new JsonGroupStore();
 198         registered = false;
 199         save();
 200     }
 201
 202     public boolean isRegistered() {
 203         return registered;
 204     }
 205
 206     public void register(boolean voiceVerication) throws IOException {
 207         password = Util.getSecret(18);
 208
 209         accountManager = new SignalServiceAccountManager(URL, TRUST_STORE, username, password, USER_AGENT);
 210
 211         if (voiceVerication)
 212             accountManager.requestVoiceVerificationCode();
 213         else
 214             accountManager.requestSmsVerificationCode();
 215
 216         registered = false;
 217         save();
 218     }
 219
 220     public URI getDeviceLinkUri() throws TimeoutException, IOException {
 221         password = Util.getSecret(18);
 222
 223         accountManager = new SignalServiceAccountManager(URL, TRUST_STORE, username, password, USER_AGENT);
 224         String uuid = accountManager.getNewDeviceUuid();
 225
 226         registered = false;
 227         try {
 228             return new URI("tsdevice:/?uuid=" + URLEncoder.encode(uuid, "utf-8") + "&pub_key=" + URLEncoder.encode(Base64.encodeBytesWithoutPadding(signalProtocolStore.getIdentityKeyPair().getPublicKey().serialize()), "utf-8"));
 229         } catch (URISyntaxException e) {
 230             // Shouldn't happen
 231             return null;
 232         }
 233     }
 234
 235     public void finishDeviceLink(String deviceName) throws IOException, InvalidKeyException, TimeoutException, UserAlreadyExists {
 236         signalingKey = Util.getSecret(52);
 237         SignalServiceAccountManager.NewDeviceRegistrationReturn ret = accountManager.finishNewDeviceRegistration(signalProtocolStore.getIdentityKeyPair(), signalingKey, false, true, signalProtocolStore.getLocalRegistrationId(), deviceName);
 238         deviceId = ret.getDeviceId();
 239         username = ret.getNumber();
 240         // TODO do this check before actually registering
 241         if (userExists()) {
 242             throw new UserAlreadyExists(username, getFileName());
 243         }
 244         signalProtocolStore = new JsonSignalProtocolStore(ret.getIdentity(), signalProtocolStore.getLocalRegistrationId());
 245
 246         registered = true;
 247         refreshPreKeys();
 248     }
 249
 250     private List<PreKeyRecord> generatePreKeys() {
 251         List<PreKeyRecord> records = new LinkedList<>();
 252
 253         for (int i = 0; i < PREKEY_BATCH_SIZE; i++) {
 254             int preKeyId = (preKeyIdOffset + i) % Medium.MAX_VALUE;
 255             ECKeyPair keyPair = Curve.generateKeyPair();
 256             PreKeyRecord record = new PreKeyRecord(preKeyId, keyPair);
 257
 258             signalProtocolStore.storePreKey(preKeyId, record);
 259             records.add(record);
 260         }
 261
 262         preKeyIdOffset = (preKeyIdOffset + PREKEY_BATCH_SIZE + 1) % Medium.MAX_VALUE;
 263         save();
 264
 265         return records;
 266     }
 267
 268     private PreKeyRecord getOrGenerateLastResortPreKey() {
 269         if (signalProtocolStore.containsPreKey(Medium.MAX_VALUE)) {
 270             try {
 271                 return signalProtocolStore.loadPreKey(Medium.MAX_VALUE);
 272             } catch (InvalidKeyIdException e) {
 273                 signalProtocolStore.removePreKey(Medium.MAX_VALUE);
 274             }
 275         }
 276
 277         ECKeyPair keyPair = Curve.generateKeyPair();
 278         PreKeyRecord record = new PreKeyRecord(Medium.MAX_VALUE, keyPair);
 279
 280         signalProtocolStore.storePreKey(Medium.MAX_VALUE, record);
 281         save();
 282
 283         return record;
 284     }
 285
 286     private SignedPreKeyRecord generateSignedPreKey(IdentityKeyPair identityKeyPair) {
 287         try {
 288             ECKeyPair keyPair = Curve.generateKeyPair();
 289             byte[] signature = Curve.calculateSignature(identityKeyPair.getPrivateKey(), keyPair.getPublicKey().serialize());
 290             SignedPreKeyRecord record = new SignedPreKeyRecord(nextSignedPreKeyId, System.currentTimeMillis(), keyPair, signature);
 291
 292             signalProtocolStore.storeSignedPreKey(nextSignedPreKeyId, record);
 293             nextSignedPreKeyId = (nextSignedPreKeyId + 1) % Medium.MAX_VALUE;
 294             save();
 295
 296             return record;
 297         } catch (InvalidKeyException e) {
 298             throw new AssertionError(e);
 299         }
 300     }
 301
 302     public void verifyAccount(String verificationCode) throws IOException {
 303         verificationCode = verificationCode.replace("-", "");
 304         signalingKey = Util.getSecret(52);
 305         accountManager.verifyAccountWithCode(verificationCode, signalingKey, signalProtocolStore.getLocalRegistrationId(), false, true);
 306
 307         //accountManager.setGcmId(Optional.of(GoogleCloudMessaging.getInstance(this).register(REGISTRATION_ID)));
 308         registered = true;
 309
 310         refreshPreKeys();
 311         save();
 312     }
 313
 314     private void refreshPreKeys() throws IOException {
 315         List<PreKeyRecord> oneTimePreKeys = generatePreKeys();
 316         PreKeyRecord lastResortKey = getOrGenerateLastResortPreKey();
 317         SignedPreKeyRecord signedPreKeyRecord = generateSignedPreKey(signalProtocolStore.getIdentityKeyPair());
 318
 319         accountManager.setPreKeys(signalProtocolStore.getIdentityKeyPair().getPublicKey(), lastResortKey, signedPreKeyRecord, oneTimePreKeys);
 320     }
 321
 322
 323     private static List<SignalServiceAttachment> getSignalServiceAttachments(List<String> attachments) throws AttachmentInvalidException {
 324         List<SignalServiceAttachment> SignalServiceAttachments = null;
 325         if (attachments != null) {
 326             SignalServiceAttachments = new ArrayList<>(attachments.size());
 327             for (String attachment : attachments) {
 328                 try {
 329                     SignalServiceAttachments.add(createAttachment(attachment));
 330                 } catch (IOException e) {
 331                     throw new AttachmentInvalidException(attachment, e);
 332                 }
 333             }
 334         }
 335         return SignalServiceAttachments;
 336     }
 337
 338     private static SignalServiceAttachmentStream createAttachment(String attachment) throws IOException {
 339         File attachmentFile = new File(attachment);
 340         InputStream attachmentStream = new FileInputStream(attachmentFile);
 341         final long attachmentSize = attachmentFile.length();
 342         String mime = Files.probeContentType(Paths.get(attachment));
 343         return new SignalServiceAttachmentStream(attachmentStream, mime, attachmentSize, null);
 344     }
 345
 346     @Override
 347     public void sendGroupMessage(String messageText, List<String> attachments,
 348                                  byte[] groupId)
 349             throws IOException, EncapsulatedExceptions, GroupNotFoundException, AttachmentInvalidException, UntrustedIdentityException {
 350         final SignalServiceDataMessage.Builder messageBuilder = SignalServiceDataMessage.newBuilder().withBody(messageText);
 351         if (attachments != null) {
 352             messageBuilder.withAttachments(getSignalServiceAttachments(attachments));
 353         }
 354         if (groupId != null) {
 355             SignalServiceGroup group = SignalServiceGroup.newBuilder(SignalServiceGroup.Type.DELIVER)
 356                     .withId(groupId)
 357                     .build();
 358             messageBuilder.asGroupMessage(group);
 359         }
 360         SignalServiceDataMessage message = messageBuilder.build();
 361
 362         sendMessage(message, groupStore.getGroup(groupId).members);
 363     }
 364
 365     public void sendQuitGroupMessage(byte[] groupId) throws GroupNotFoundException, IOException, EncapsulatedExceptions, UntrustedIdentityException {
 366         SignalServiceGroup group = SignalServiceGroup.newBuilder(SignalServiceGroup.Type.QUIT)
 367                 .withId(groupId)
 368                 .build();
 369
 370         SignalServiceDataMessage message = SignalServiceDataMessage.newBuilder()
 371                 .asGroupMessage(group)
 372                 .build();
 373
 374         sendMessage(message, groupStore.getGroup(groupId).members);
 375     }
 376
 377     public byte[] sendUpdateGroupMessage(byte[] groupId, String name, Collection<String> members, String avatarFile) throws IOException, EncapsulatedExceptions, GroupNotFoundException, AttachmentInvalidException, UntrustedIdentityException {
 378         GroupInfo g;
 379         if (groupId == null) {
 380             // Create new group
 381             g = new GroupInfo(Util.getSecretBytes(16));
 382             g.members.add(username);
 383         } else {
 384             g = groupStore.getGroup(groupId);
 385         }
 386
 387         if (name != null) {
 388             g.name = name;
 389         }
 390
 391         if (members != null) {
 392             for (String member : members) {
 393                 try {
 394                     g.members.add(canonicalizeNumber(member));
 395                 } catch (InvalidNumberException e) {
 396                     System.err.println("Failed to add member \"" + member + "\" to group: " + e.getMessage());
 397                     System.err.println("Aborting…");
 398                     System.exit(1);
 399                 }
 400             }
 401         }
 402
 403         SignalServiceGroup.Builder group = SignalServiceGroup.newBuilder(SignalServiceGroup.Type.UPDATE)
 404                 .withId(g.groupId)
 405                 .withName(g.name)
 406                 .withMembers(new ArrayList<>(g.members));
 407
 408         if (avatarFile != null) {
 409             try {
 410                 group.withAvatar(createAttachment(avatarFile));
 411                 // TODO
 412                 g.avatarId = 0;
 413             } catch (IOException e) {
 414                 throw new AttachmentInvalidException(avatarFile, e);
 415             }
 416         }
 417
 418         groupStore.updateGroup(g);
 419
 420         SignalServiceDataMessage message = SignalServiceDataMessage.newBuilder()
 421                 .asGroupMessage(group.build())
 422                 .build();
 423
 424         sendMessage(message, g.members);
 425         return g.groupId;
 426     }
 427
 428     @Override
 429     public void sendMessage(String message, List<String> attachments, String recipient)
 430             throws EncapsulatedExceptions, AttachmentInvalidException, IOException, UntrustedIdentityException {
 431         List<String> recipients = new ArrayList<>(1);
 432         recipients.add(recipient);
 433         sendMessage(message, attachments, recipients);
 434     }
 435
 436     @Override
 437     public void sendMessage(String messageText, List<String> attachments,
 438                             List<String> recipients)
 439             throws IOException, EncapsulatedExceptions, AttachmentInvalidException, UntrustedIdentityException {
 440         final SignalServiceDataMessage.Builder messageBuilder = SignalServiceDataMessage.newBuilder().withBody(messageText);
 441         if (attachments != null) {
 442             messageBuilder.withAttachments(getSignalServiceAttachments(attachments));
 443         }
 444         SignalServiceDataMessage message = messageBuilder.build();
 445
 446         sendMessage(message, recipients);
 447     }
 448
 449     @Override
 450     public void sendEndSessionMessage(List<String> recipients) throws IOException, EncapsulatedExceptions, UntrustedIdentityException {
 451         SignalServiceDataMessage message = SignalServiceDataMessage.newBuilder()
 452                 .asEndSessionMessage()
 453                 .build();
 454
 455         sendMessage(message, recipients);
 456     }
 457
 458     private void sendMessage(SignalServiceDataMessage message, Collection<String> recipients)
 459             throws IOException, EncapsulatedExceptions, UntrustedIdentityException {
 460         SignalServiceMessageSender messageSender = new SignalServiceMessageSender(URL, TRUST_STORE, username, password,
 461                 deviceId, signalProtocolStore, USER_AGENT, Optional.<SignalServiceMessageSender.EventListener>absent());
 462
 463         Set<SignalServiceAddress> recipientsTS = new HashSet<>(recipients.size());
 464         for (String recipient : recipients) {
 465             try {
 466                 recipientsTS.add(getPushAddress(recipient));
 467             } catch (InvalidNumberException e) {
 468                 System.err.println("Failed to add recipient \"" + recipient + "\": " + e.getMessage());
 469                 System.err.println("Aborting sending.");
 470                 save();
 471                 return;
 472             }
 473         }
 474
 475         if (message.getGroupInfo().isPresent()) {
 476             messageSender.sendMessage(new ArrayList<>(recipientsTS), message);
 477         } else {
 478             // Send to all individually, so sync messages are sent correctly
 479             for (SignalServiceAddress address : recipientsTS) {
 480                 messageSender.sendMessage(address, message);
 481             }
 482         }
 483
 484         if (message.isEndSession()) {
 485             for (SignalServiceAddress recipient : recipientsTS) {
 486                 handleEndSession(recipient.getNumber());
 487             }
 488         }
 489         save();
 490     }
 491
 492     private SignalServiceContent decryptMessage(SignalServiceEnvelope envelope) {
 493         SignalServiceCipher cipher = new SignalServiceCipher(new SignalServiceAddress(username), signalProtocolStore);
 494         try {
 495             return cipher.decrypt(envelope);
 496         } catch (Exception e) {
 497             // TODO handle all exceptions
 498             e.printStackTrace();
 499             return null;
 500         }
 501     }
 502
 503     private void handleEndSession(String source) {
 504         signalProtocolStore.deleteAllSessions(source);
 505     }
 506
 507     public interface ReceiveMessageHandler {
 508         void handleMessage(SignalServiceEnvelope envelope, SignalServiceContent decryptedContent, GroupInfo group);
 509     }
 510
 511     private GroupInfo handleSignalServiceDataMessage(SignalServiceDataMessage message, boolean isSync, String source, String destination) {
 512         GroupInfo group = null;
 513         if (message.getGroupInfo().isPresent()) {
 514             SignalServiceGroup groupInfo = message.getGroupInfo().get();
 515             switch (groupInfo.getType()) {
 516                 case UPDATE:
 517                     try {
 518                         group = groupStore.getGroup(groupInfo.getGroupId());
 519                     } catch (GroupNotFoundException e) {
 520                         group = new GroupInfo(groupInfo.getGroupId());
 521                     }
 522
 523                     if (groupInfo.getAvatar().isPresent()) {
 524                         SignalServiceAttachment avatar = groupInfo.getAvatar().get();
 525                         if (avatar.isPointer()) {
 526                             long avatarId = avatar.asPointer().getId();
 527                             try {
 528                                 retrieveAttachment(avatar.asPointer());
 529                                 group.avatarId = avatarId;
 530                             } catch (IOException | InvalidMessageException e) {
 531                                 System.err.println("Failed to retrieve group avatar (" + avatarId + "): " + e.getMessage());
 532                             }
 533                         }
 534                     }
 535
 536                     if (groupInfo.getName().isPresent()) {
 537                         group.name = groupInfo.getName().get();
 538                     }
 539
 540                     if (groupInfo.getMembers().isPresent()) {
 541                         group.members.addAll(groupInfo.getMembers().get());
 542                     }
 543
 544                     groupStore.updateGroup(group);
 545                     break;
 546                 case DELIVER:
 547                     try {
 548                         group = groupStore.getGroup(groupInfo.getGroupId());
 549                     } catch (GroupNotFoundException e) {
 550                     }
 551                     break;
 552                 case QUIT:
 553                     try {
 554                         group = groupStore.getGroup(groupInfo.getGroupId());
 555                         group.members.remove(source);
 556                     } catch (GroupNotFoundException e) {
 557                     }
 558                     break;
 559             }
 560         }
 561         if (message.isEndSession()) {
 562             handleEndSession(isSync ? destination : source);
 563         }
 564         if (message.getAttachments().isPresent()) {
 565             for (SignalServiceAttachment attachment : message.getAttachments().get()) {
 566                 if (attachment.isPointer()) {
 567                     try {
 568                         retrieveAttachment(attachment.asPointer());
 569                     } catch (IOException | InvalidMessageException e) {
 570                         System.err.println("Failed to retrieve attachment (" + attachment.asPointer().getId() + "): " + e.getMessage());
 571                     }
 572                 }
 573             }
 574         }
 575         return group;
 576     }
 577
 578     public void receiveMessages(int timeoutSeconds, boolean returnOnTimeout, ReceiveMessageHandler handler) throws IOException {
 579         final SignalServiceMessageReceiver messageReceiver = new SignalServiceMessageReceiver(URL, TRUST_STORE, username, password, deviceId, signalingKey, USER_AGENT);
 580         SignalServiceMessagePipe messagePipe = null;
 581
 582         try {
 583             messagePipe = messageReceiver.createMessagePipe();
 584
 585             while (true) {
 586                 SignalServiceEnvelope envelope;
 587                 SignalServiceContent content = null;
 588                 GroupInfo group = null;
 589                 try {
 590                     envelope = messagePipe.read(timeoutSeconds, TimeUnit.SECONDS);
 591                     if (!envelope.isReceipt()) {
 592                         content = decryptMessage(envelope);
 593                         if (content != null) {
 594                             if (content.getDataMessage().isPresent()) {
 595                                 SignalServiceDataMessage message = content.getDataMessage().get();
 596                                 group = handleSignalServiceDataMessage(message, false, envelope.getSource(), username);
 597                             }
 598                             if (content.getSyncMessage().isPresent()) {
 599                                 SignalServiceSyncMessage syncMessage = content.getSyncMessage().get();
 600                                 if (syncMessage.getSent().isPresent()) {
 601                                     SignalServiceDataMessage message = syncMessage.getSent().get().getMessage();
 602                                     group = handleSignalServiceDataMessage(message, true, envelope.getSource(), syncMessage.getSent().get().getDestination().get());
 603                                 }
 604                                 if (syncMessage.getRequest().isPresent()) {
 605                                     // TODO
 606                                 }
 607                                 if (syncMessage.getGroups().isPresent()) {
 608                                     // TODO
 609                                 }
 610                             }
 611                         }
 612                     }
 613                     save();
 614                     handler.handleMessage(envelope, content, group);
 615                 } catch (TimeoutException e) {
 616                     if (returnOnTimeout)
 617                         return;
 618                 } catch (InvalidVersionException e) {
 619                     System.err.println("Ignoring error: " + e.getMessage());
 620                 }
 621             }
 622         } finally {
 623             if (messagePipe != null)
 624                 messagePipe.shutdown();
 625         }
 626     }
 627
 628     public File getAttachmentFile(long attachmentId) {
 629         return new File(attachmentsPath, attachmentId + "");
 630     }
 631
 632     private File retrieveAttachment(SignalServiceAttachmentPointer pointer) throws IOException, InvalidMessageException {
 633         final SignalServiceMessageReceiver messageReceiver = new SignalServiceMessageReceiver(URL, TRUST_STORE, username, password, deviceId, signalingKey, USER_AGENT);
 634
 635         File tmpFile = File.createTempFile("ts_attach_" + pointer.getId(), ".tmp");
 636         InputStream input = messageReceiver.retrieveAttachment(pointer, tmpFile);
 637
 638         new File(attachmentsPath).mkdirs();
 639         File outputFile = getAttachmentFile(pointer.getId());
 640         OutputStream output = null;
 641         try {
 642             output = new FileOutputStream(outputFile);
 643             byte[] buffer = new byte[4096];
 644             int read;
 645
 646             while ((read = input.read(buffer)) != -1) {
 647                 output.write(buffer, 0, read);
 648             }
 649         } catch (FileNotFoundException e) {
 650             e.printStackTrace();
 651             return null;
 652         } finally {
 653             if (output != null) {
 654                 output.close();
 655                 output = null;
 656             }
 657             if (!tmpFile.delete()) {
 658                 System.err.println("Failed to delete temp file: " + tmpFile);
 659             }
 660         }
 661         if (pointer.getPreview().isPresent()) {
 662             File previewFile = new File(outputFile + ".preview");
 663             try {
 664                 output = new FileOutputStream(previewFile);
 665                 byte[] preview = pointer.getPreview().get();
 666                 output.write(preview, 0, preview.length);
 667             } catch (FileNotFoundException e) {
 668                 e.printStackTrace();
 669                 return null;
 670             } finally {
 671                 if (output != null) {
 672                     output.close();
 673                 }
 674             }
 675         }
 676         return outputFile;
 677     }
 678
 679     private String canonicalizeNumber(String number) throws InvalidNumberException {
 680         String localNumber = username;
 681         return PhoneNumberFormatter.formatNumber(number, localNumber);
 682     }
 683
 684     private SignalServiceAddress getPushAddress(String number) throws InvalidNumberException {
 685         String e164number = canonicalizeNumber(number);
 686         return new SignalServiceAddress(e164number);
 687     }
 688
 689     @Override
 690     public boolean isRemote() {
 691         return false;
 692     }
 693 }