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