nmode's Git Repositories - signal-cli/blob - src/main/java/org/asamk/textsecure/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.textsecure;
  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.TextSecure;
  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.SignalServiceCipher;
  41 import org.whispersystems.signalservice.api.messages.*;
  42 import org.whispersystems.signalservice.api.push.SignalServiceAddress;
  43 import org.whispersystems.signalservice.api.push.TrustStore;
  44 import org.whispersystems.signalservice.api.push.exceptions.EncapsulatedExceptions;
  45 import org.whispersystems.signalservice.api.util.InvalidNumberException;
  46 import org.whispersystems.signalservice.api.util.PhoneNumberFormatter;
  47
  48 import java.io.*;
  49 import java.nio.file.Files;
  50 import java.nio.file.Paths;
  51 import java.util.*;
  52 import java.util.concurrent.TimeUnit;
  53 import java.util.concurrent.TimeoutException;
  54
  55 class Manager implements TextSecure {
  56     private final static String URL = "https://SignalService-service.whispersystems.org";
  57     private final static TrustStore TRUST_STORE = new WhisperTrustStore();
  58
  59     public final static String PROJECT_NAME = Manager.class.getPackage().getImplementationTitle();
  60     public final static String PROJECT_VERSION = Manager.class.getPackage().getImplementationVersion();
  61     private final static String USER_AGENT = PROJECT_NAME + " " + PROJECT_VERSION;
  62
  63     private final String settingsPath;
  64     private final String dataPath;
  65     private final String attachmentsPath;
  66
  67     private final ObjectMapper jsonProcessot = new ObjectMapper();
  68     private String username;
  69     private String password;
  70     private String signalingKey;
  71     private int preKeyIdOffset;
  72     private int nextSignedPreKeyId;
  73
  74     private boolean registered = false;
  75
  76     private SignalProtocolStore signalProtocolStore;
  77     private SignalServiceAccountManager accountManager;
  78     private JsonGroupStore groupStore;
  79
  80     public Manager(String username, String settingsPath) {
  81         this.username = username;
  82         this.settingsPath = settingsPath;
  83         this.dataPath = this.settingsPath + "/data";
  84         this.attachmentsPath = this.settingsPath + "/attachments";
  85
  86         jsonProcessot.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.NONE); // disable autodetect
  87         jsonProcessot.enable(SerializationFeature.INDENT_OUTPUT); // for pretty print, you can disable it.
  88         jsonProcessot.enable(SerializationFeature.WRITE_NULL_MAP_VALUES);
  89         jsonProcessot.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
  90     }
  91
  92     public String getFileName() {
  93         new File(dataPath).mkdirs();
  94         return dataPath + "/" + username;
  95     }
  96
  97     public boolean userExists() {
  98         File f = new File(getFileName());
  99         return !(!f.exists() || f.isDirectory());
 100     }
 101
 102     public boolean userHasKeys() {
 103         return signalProtocolStore != null;
 104     }
 105
 106     private JsonNode getNotNullNode(JsonNode parent, String name) throws InvalidObjectException {
 107         JsonNode node = parent.get(name);
 108         if (node == null) {
 109             throw new InvalidObjectException(String.format("Incorrect file format: expected parameter %s not found ", name));
 110         }
 111
 112         return node;
 113     }
 114
 115     public void load() throws IOException, InvalidKeyException {
 116         JsonNode rootNode = jsonProcessot.readTree(new File(getFileName()));
 117
 118         username = getNotNullNode(rootNode, "username").asText();
 119         password = getNotNullNode(rootNode, "password").asText();
 120         if (rootNode.has("signalingKey")) {
 121             signalingKey = getNotNullNode(rootNode, "signalingKey").asText();
 122         }
 123         if (rootNode.has("preKeyIdOffset")) {
 124             preKeyIdOffset = getNotNullNode(rootNode, "preKeyIdOffset").asInt(0);
 125         } else {
 126             preKeyIdOffset = 0;
 127         }
 128         if (rootNode.has("nextSignedPreKeyId")) {
 129             nextSignedPreKeyId = getNotNullNode(rootNode, "nextSignedPreKeyId").asInt();
 130         } else {
 131             nextSignedPreKeyId = 0;
 132         }
 133         signalProtocolStore = jsonProcessot.convertValue(getNotNullNode(rootNode, "axolotlStore"), JsonSignalProtocolStore.class);
 134         registered = getNotNullNode(rootNode, "registered").asBoolean();
 135         JsonNode groupStoreNode = rootNode.get("groupStore");
 136         if (groupStoreNode != null) {
 137             groupStore = jsonProcessot.convertValue(groupStoreNode, JsonGroupStore.class);
 138         }
 139         if (groupStore == null) {
 140             groupStore = new JsonGroupStore();
 141         }
 142         accountManager = new SignalServiceAccountManager(URL, TRUST_STORE, username, password, USER_AGENT);
 143     }
 144
 145     private void save() {
 146         ObjectNode rootNode = jsonProcessot.createObjectNode();
 147         rootNode.put("username", username)
 148                 .put("password", password)
 149                 .put("signalingKey", signalingKey)
 150                 .put("preKeyIdOffset", preKeyIdOffset)
 151                 .put("nextSignedPreKeyId", nextSignedPreKeyId)
 152                 .put("registered", registered)
 153                 .putPOJO("axolotlStore", signalProtocolStore)
 154                 .putPOJO("groupStore", groupStore)
 155         ;
 156         try {
 157             jsonProcessot.writeValue(new File(getFileName()), rootNode);
 158         } catch (Exception e) {
 159             System.err.println(String.format("Error saving file: %s", e.getMessage()));
 160         }
 161     }
 162
 163     public void createNewIdentity() {
 164         IdentityKeyPair identityKey = KeyHelper.generateIdentityKeyPair();
 165         int registrationId = KeyHelper.generateRegistrationId(false);
 166         signalProtocolStore = new JsonSignalProtocolStore(identityKey, registrationId);
 167         groupStore = new JsonGroupStore();
 168         registered = false;
 169         save();
 170     }
 171
 172     public boolean isRegistered() {
 173         return registered;
 174     }
 175
 176     public void register(boolean voiceVerication) throws IOException {
 177         password = Util.getSecret(18);
 178
 179         accountManager = new SignalServiceAccountManager(URL, TRUST_STORE, username, password, USER_AGENT);
 180
 181         if (voiceVerication)
 182             accountManager.requestVoiceVerificationCode();
 183         else
 184             accountManager.requestSmsVerificationCode();
 185
 186         registered = false;
 187         save();
 188     }
 189
 190     private static final int BATCH_SIZE = 100;
 191
 192     private List<PreKeyRecord> generatePreKeys() {
 193         List<PreKeyRecord> records = new LinkedList<>();
 194
 195         for (int i = 0; i < BATCH_SIZE; i++) {
 196             int preKeyId = (preKeyIdOffset + i) % Medium.MAX_VALUE;
 197             ECKeyPair keyPair = Curve.generateKeyPair();
 198             PreKeyRecord record = new PreKeyRecord(preKeyId, keyPair);
 199
 200             signalProtocolStore.storePreKey(preKeyId, record);
 201             records.add(record);
 202         }
 203
 204         preKeyIdOffset = (preKeyIdOffset + BATCH_SIZE + 1) % Medium.MAX_VALUE;
 205         save();
 206
 207         return records;
 208     }
 209
 210     private PreKeyRecord generateLastResortPreKey() {
 211         if (signalProtocolStore.containsPreKey(Medium.MAX_VALUE)) {
 212             try {
 213                 return signalProtocolStore.loadPreKey(Medium.MAX_VALUE);
 214             } catch (InvalidKeyIdException e) {
 215                 signalProtocolStore.removePreKey(Medium.MAX_VALUE);
 216             }
 217         }
 218
 219         ECKeyPair keyPair = Curve.generateKeyPair();
 220         PreKeyRecord record = new PreKeyRecord(Medium.MAX_VALUE, keyPair);
 221
 222         signalProtocolStore.storePreKey(Medium.MAX_VALUE, record);
 223         save();
 224
 225         return record;
 226     }
 227
 228     private SignedPreKeyRecord generateSignedPreKey(IdentityKeyPair identityKeyPair) {
 229         try {
 230             ECKeyPair keyPair = Curve.generateKeyPair();
 231             byte[] signature = Curve.calculateSignature(identityKeyPair.getPrivateKey(), keyPair.getPublicKey().serialize());
 232             SignedPreKeyRecord record = new SignedPreKeyRecord(nextSignedPreKeyId, System.currentTimeMillis(), keyPair, signature);
 233
 234             signalProtocolStore.storeSignedPreKey(nextSignedPreKeyId, record);
 235             nextSignedPreKeyId = (nextSignedPreKeyId + 1) % Medium.MAX_VALUE;
 236             save();
 237
 238             return record;
 239         } catch (InvalidKeyException e) {
 240             throw new AssertionError(e);
 241         }
 242     }
 243
 244     public void verifyAccount(String verificationCode) throws IOException {
 245         verificationCode = verificationCode.replace("-", "");
 246         signalingKey = Util.getSecret(52);
 247         accountManager.verifyAccountWithCode(verificationCode, signalingKey, signalProtocolStore.getLocalRegistrationId(), false, true);
 248
 249         //accountManager.setGcmId(Optional.of(GoogleCloudMessaging.getInstance(this).register(REGISTRATION_ID)));
 250         registered = true;
 251
 252         List<PreKeyRecord> oneTimePreKeys = generatePreKeys();
 253
 254         PreKeyRecord lastResortKey = generateLastResortPreKey();
 255
 256         SignedPreKeyRecord signedPreKeyRecord = generateSignedPreKey(signalProtocolStore.getIdentityKeyPair());
 257
 258         accountManager.setPreKeys(signalProtocolStore.getIdentityKeyPair().getPublicKey(), lastResortKey, signedPreKeyRecord, oneTimePreKeys);
 259         save();
 260     }
 261
 262
 263     private static List<SignalServiceAttachment> getSignalServiceAttachments(List<String> attachments) throws AttachmentInvalidException {
 264         List<SignalServiceAttachment> SignalServiceAttachments = null;
 265         if (attachments != null) {
 266             SignalServiceAttachments = new ArrayList<>(attachments.size());
 267             for (String attachment : attachments) {
 268                 try {
 269                     SignalServiceAttachments.add(createAttachment(attachment));
 270                 } catch (IOException e) {
 271                     throw new AttachmentInvalidException(attachment, e);
 272                 }
 273             }
 274         }
 275         return SignalServiceAttachments;
 276     }
 277
 278     private static SignalServiceAttachmentStream createAttachment(String attachment) throws IOException {
 279         File attachmentFile = new File(attachment);
 280         InputStream attachmentStream = new FileInputStream(attachmentFile);
 281         final long attachmentSize = attachmentFile.length();
 282         String mime = Files.probeContentType(Paths.get(attachment));
 283         return new SignalServiceAttachmentStream(attachmentStream, mime, attachmentSize, null);
 284     }
 285
 286     @Override
 287     public void sendGroupMessage(String messageText, List<String> attachments,
 288                                  byte[] groupId)
 289             throws IOException, EncapsulatedExceptions, GroupNotFoundException, AttachmentInvalidException {
 290         final SignalServiceDataMessage.Builder messageBuilder = SignalServiceDataMessage.newBuilder().withBody(messageText);
 291         if (attachments != null) {
 292             messageBuilder.withAttachments(getSignalServiceAttachments(attachments));
 293         }
 294         if (groupId != null) {
 295             SignalServiceGroup group = SignalServiceGroup.newBuilder(SignalServiceGroup.Type.DELIVER)
 296                     .withId(groupId)
 297                     .build();
 298             messageBuilder.asGroupMessage(group);
 299         }
 300         SignalServiceDataMessage message = messageBuilder.build();
 301
 302         sendMessage(message, groupStore.getGroup(groupId).members);
 303     }
 304
 305     public void sendQuitGroupMessage(byte[] groupId) throws GroupNotFoundException, IOException, EncapsulatedExceptions {
 306         SignalServiceGroup group = SignalServiceGroup.newBuilder(SignalServiceGroup.Type.QUIT)
 307                 .withId(groupId)
 308                 .build();
 309
 310         SignalServiceDataMessage message = SignalServiceDataMessage.newBuilder()
 311                 .asGroupMessage(group)
 312                 .build();
 313
 314         sendMessage(message, groupStore.getGroup(groupId).members);
 315     }
 316
 317     public byte[] sendUpdateGroupMessage(byte[] groupId, String name, Collection<String> members, String avatarFile) throws IOException, EncapsulatedExceptions, GroupNotFoundException, AttachmentInvalidException {
 318         GroupInfo g;
 319         if (groupId == null) {
 320             // Create new group
 321             g = new GroupInfo(Util.getSecretBytes(16));
 322             g.members.add(username);
 323         } else {
 324             g = groupStore.getGroup(groupId);
 325         }
 326
 327         if (name != null) {
 328             g.name = name;
 329         }
 330
 331         if (members != null) {
 332             for (String member : members) {
 333                 try {
 334                     g.members.add(canonicalizeNumber(member));
 335                 } catch (InvalidNumberException e) {
 336                     System.err.println("Failed to add member \"" + member + "\" to group: " + e.getMessage());
 337                     System.err.println("Aborting…");
 338                     System.exit(1);
 339                 }
 340             }
 341         }
 342
 343         SignalServiceGroup.Builder group = SignalServiceGroup.newBuilder(SignalServiceGroup.Type.UPDATE)
 344                 .withId(g.groupId)
 345                 .withName(g.name)
 346                 .withMembers(new ArrayList<>(g.members));
 347
 348         if (avatarFile != null) {
 349             try {
 350                 group.withAvatar(createAttachment(avatarFile));
 351                 // TODO
 352                 g.avatarId = 0;
 353             } catch (IOException e) {
 354                 throw new AttachmentInvalidException(avatarFile, e);
 355             }
 356         }
 357
 358         groupStore.updateGroup(g);
 359
 360         SignalServiceDataMessage message = SignalServiceDataMessage.newBuilder()
 361                 .asGroupMessage(group.build())
 362                 .build();
 363
 364         sendMessage(message, g.members);
 365         return g.groupId;
 366     }
 367
 368     @Override
 369     public void sendMessage(String message, List<String> attachments, String recipient)
 370             throws EncapsulatedExceptions, AttachmentInvalidException, IOException {
 371         List<String> recipients = new ArrayList<>(1);
 372         recipients.add(recipient);
 373         sendMessage(message, attachments, recipients);
 374     }
 375
 376     @Override
 377     public void sendMessage(String messageText, List<String> attachments,
 378                             List<String> recipients)
 379             throws IOException, EncapsulatedExceptions, AttachmentInvalidException {
 380         final SignalServiceDataMessage.Builder messageBuilder = SignalServiceDataMessage.newBuilder().withBody(messageText);
 381         if (attachments != null) {
 382             messageBuilder.withAttachments(getSignalServiceAttachments(attachments));
 383         }
 384         SignalServiceDataMessage message = messageBuilder.build();
 385
 386         sendMessage(message, recipients);
 387     }
 388
 389     @Override
 390     public void sendEndSessionMessage(List<String> recipients) throws IOException, EncapsulatedExceptions {
 391         SignalServiceDataMessage message = SignalServiceDataMessage.newBuilder()
 392                 .asEndSessionMessage()
 393                 .build();
 394
 395         sendMessage(message, recipients);
 396     }
 397
 398     private void sendMessage(SignalServiceDataMessage message, Collection<String> recipients)
 399             throws IOException, EncapsulatedExceptions {
 400         SignalServiceMessageSender messageSender = new SignalServiceMessageSender(URL, TRUST_STORE, username, password,
 401                 signalProtocolStore, USER_AGENT, Optional.<SignalServiceMessageSender.EventListener>absent());
 402
 403         Set<SignalServiceAddress> recipientsTS = new HashSet<>(recipients.size());
 404         for (String recipient : recipients) {
 405             try {
 406                 recipientsTS.add(getPushAddress(recipient));
 407             } catch (InvalidNumberException e) {
 408                 System.err.println("Failed to add recipient \"" + recipient + "\": " + e.getMessage());
 409                 System.err.println("Aborting sending.");
 410                 save();
 411                 return;
 412             }
 413         }
 414
 415         messageSender.sendMessage(new ArrayList<>(recipientsTS), message);
 416
 417         if (message.isEndSession()) {
 418             for (SignalServiceAddress recipient : recipientsTS) {
 419                 handleEndSession(recipient.getNumber());
 420             }
 421         }
 422         save();
 423     }
 424
 425     private SignalServiceContent decryptMessage(SignalServiceEnvelope envelope) {
 426         SignalServiceCipher cipher = new SignalServiceCipher(new SignalServiceAddress(username), signalProtocolStore);
 427         try {
 428             return cipher.decrypt(envelope);
 429         } catch (Exception e) {
 430             // TODO handle all exceptions
 431             e.printStackTrace();
 432             return null;
 433         }
 434     }
 435
 436     private void handleEndSession(String source) {
 437         signalProtocolStore.deleteAllSessions(source);
 438     }
 439
 440     public interface ReceiveMessageHandler {
 441         void handleMessage(SignalServiceEnvelope envelope, SignalServiceContent decryptedContent, GroupInfo group);
 442     }
 443
 444     public void receiveMessages(int timeoutSeconds, boolean returnOnTimeout, ReceiveMessageHandler handler) throws IOException {
 445         final SignalServiceMessageReceiver messageReceiver = new SignalServiceMessageReceiver(URL, TRUST_STORE, username, password, signalingKey, USER_AGENT);
 446         SignalServiceMessagePipe messagePipe = null;
 447
 448         try {
 449             messagePipe = messageReceiver.createMessagePipe();
 450
 451             while (true) {
 452                 SignalServiceEnvelope envelope;
 453                 SignalServiceContent content = null;
 454                 GroupInfo group = null;
 455                 try {
 456                     envelope = messagePipe.read(timeoutSeconds, TimeUnit.SECONDS);
 457                     if (!envelope.isReceipt()) {
 458                         content = decryptMessage(envelope);
 459                         if (content != null) {
 460                             if (content.getDataMessage().isPresent()) {
 461                                 SignalServiceDataMessage message = content.getDataMessage().get();
 462                                 if (message.getGroupInfo().isPresent()) {
 463                                     SignalServiceGroup groupInfo = message.getGroupInfo().get();
 464                                     switch (groupInfo.getType()) {
 465                                         case UPDATE:
 466                                             try {
 467                                                 group = groupStore.getGroup(groupInfo.getGroupId());
 468                                             } catch (GroupNotFoundException e) {
 469                                                 group = new GroupInfo(groupInfo.getGroupId());
 470                                             }
 471
 472                                             if (groupInfo.getAvatar().isPresent()) {
 473                                                 SignalServiceAttachment avatar = groupInfo.getAvatar().get();
 474                                                 if (avatar.isPointer()) {
 475                                                     long avatarId = avatar.asPointer().getId();
 476                                                     try {
 477                                                         retrieveAttachment(avatar.asPointer());
 478                                                         group.avatarId = avatarId;
 479                                                     } catch (IOException | InvalidMessageException e) {
 480                                                         System.err.println("Failed to retrieve group avatar (" + avatarId + "): " + e.getMessage());
 481                                                     }
 482                                                 }
 483                                             }
 484
 485                                             if (groupInfo.getName().isPresent()) {
 486                                                 group.name = groupInfo.getName().get();
 487                                             }
 488
 489                                             if (groupInfo.getMembers().isPresent()) {
 490                                                 group.members.addAll(groupInfo.getMembers().get());
 491                                             }
 492
 493                                             groupStore.updateGroup(group);
 494                                             break;
 495                                         case DELIVER:
 496                                             try {
 497                                                 group = groupStore.getGroup(groupInfo.getGroupId());
 498                                             } catch (GroupNotFoundException e) {
 499                                             }
 500                                             break;
 501                                         case QUIT:
 502                                             try {
 503                                                 group = groupStore.getGroup(groupInfo.getGroupId());
 504                                                 group.members.remove(envelope.getSource());
 505                                             } catch (GroupNotFoundException e) {
 506                                             }
 507                                             break;
 508                                     }
 509                                 }
 510                                 if (message.isEndSession()) {
 511                                     handleEndSession(envelope.getSource());
 512                                 }
 513                                 if (message.getAttachments().isPresent()) {
 514                                     for (SignalServiceAttachment attachment : message.getAttachments().get()) {
 515                                         if (attachment.isPointer()) {
 516                                             try {
 517                                                 retrieveAttachment(attachment.asPointer());
 518                                             } catch (IOException | InvalidMessageException e) {
 519                                                 System.err.println("Failed to retrieve attachment (" + attachment.asPointer().getId() + "): " + e.getMessage());
 520                                             }
 521                                         }
 522                                     }
 523                                 }
 524                             }
 525                         }
 526                     }
 527                     save();
 528                     handler.handleMessage(envelope, content, group);
 529                 } catch (TimeoutException e) {
 530                     if (returnOnTimeout)
 531                         return;
 532                 } catch (InvalidVersionException e) {
 533                     System.err.println("Ignoring error: " + e.getMessage());
 534                 }
 535             }
 536         } finally {
 537             if (messagePipe != null)
 538                 messagePipe.shutdown();
 539         }
 540     }
 541
 542     public File getAttachmentFile(long attachmentId) {
 543         return new File(attachmentsPath, attachmentId + "");
 544     }
 545
 546     private File retrieveAttachment(SignalServiceAttachmentPointer pointer) throws IOException, InvalidMessageException {
 547         final SignalServiceMessageReceiver messageReceiver = new SignalServiceMessageReceiver(URL, TRUST_STORE, username, password, signalingKey, USER_AGENT);
 548
 549         File tmpFile = File.createTempFile("ts_attach_" + pointer.getId(), ".tmp");
 550         InputStream input = messageReceiver.retrieveAttachment(pointer, tmpFile);
 551
 552         new File(attachmentsPath).mkdirs();
 553         File outputFile = getAttachmentFile(pointer.getId());
 554         OutputStream output = null;
 555         try {
 556             output = new FileOutputStream(outputFile);
 557             byte[] buffer = new byte[4096];
 558             int read;
 559
 560             while ((read = input.read(buffer)) != -1) {
 561                 output.write(buffer, 0, read);
 562             }
 563         } catch (FileNotFoundException e) {
 564             e.printStackTrace();
 565             return null;
 566         } finally {
 567             if (output != null) {
 568                 output.close();
 569                 output = null;
 570             }
 571             if (!tmpFile.delete()) {
 572                 System.err.println("Failed to delete temp file: " + tmpFile);
 573             }
 574         }
 575         if (pointer.getPreview().isPresent()) {
 576             File previewFile = new File(outputFile + ".preview");
 577             try {
 578                 output = new FileOutputStream(previewFile);
 579                 byte[] preview = pointer.getPreview().get();
 580                 output.write(preview, 0, preview.length);
 581             } catch (FileNotFoundException e) {
 582                 e.printStackTrace();
 583                 return null;
 584             } finally {
 585                 if (output != null) {
 586                     output.close();
 587                 }
 588             }
 589         }
 590         return outputFile;
 591     }
 592
 593     private String canonicalizeNumber(String number) throws InvalidNumberException {
 594         String localNumber = username;
 595         return PhoneNumberFormatter.formatNumber(number, localNumber);
 596     }
 597
 598     private SignalServiceAddress getPushAddress(String number) throws InvalidNumberException {
 599         String e164number = canonicalizeNumber(number);
 600         return new SignalServiceAddress(e164number);
 601     }
 602
 603     @Override
 604     public boolean isRemote() {
 605         return false;
 606     }
 607 }