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