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.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.AuthorizationFailedException;
  45 import org.whispersystems.signalservice.api.push.exceptions.EncapsulatedExceptions;
  46 import org.whispersystems.signalservice.api.util.InvalidNumberException;
  47 import org.whispersystems.signalservice.api.util.PhoneNumberFormatter;
  48
  49 import java.io.*;
  50 import java.nio.file.Files;
  51 import java.nio.file.Paths;
  52 import java.util.*;
  53 import java.util.concurrent.TimeUnit;
  54 import java.util.concurrent.TimeoutException;
  55
  56 class Manager implements Signal {
  57     private final static String URL = "https://textsecure-service.whispersystems.org";
  58     private final static TrustStore TRUST_STORE = new WhisperTrustStore();
  59
  60     public final static String PROJECT_NAME = Manager.class.getPackage().getImplementationTitle();
  61     public final static String PROJECT_VERSION = Manager.class.getPackage().getImplementationVersion();
  62     private final static String USER_AGENT = PROJECT_NAME == null ? null : PROJECT_NAME + " " + PROJECT_VERSION;
  63
  64     private final static int PREKEY_MINIMUM_COUNT = 20;
  65     private static final int PREKEY_BATCH_SIZE = 100;
  66
  67     private final String settingsPath;
  68     private final String dataPath;
  69     private final String attachmentsPath;
  70
  71     private final ObjectMapper jsonProcessot = new ObjectMapper();
  72     private String username;
  73     private String password;
  74     private String signalingKey;
  75     private int preKeyIdOffset;
  76     private int nextSignedPreKeyId;
  77
  78     private boolean registered = false;
  79
  80     private SignalProtocolStore signalProtocolStore;
  81     private SignalServiceAccountManager accountManager;
  82     private JsonGroupStore groupStore;
  83
  84     public Manager(String username, String settingsPath) {
  85         this.username = username;
  86         this.settingsPath = settingsPath;
  87         this.dataPath = this.settingsPath + "/data";
  88         this.attachmentsPath = this.settingsPath + "/attachments";
  89
  90         jsonProcessot.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.NONE); // disable autodetect
  91         jsonProcessot.enable(SerializationFeature.INDENT_OUTPUT); // for pretty print, you can disable it.
  92         jsonProcessot.enable(SerializationFeature.WRITE_NULL_MAP_VALUES);
  93         jsonProcessot.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
  94     }
  95
  96     public String getFileName() {
  97         new File(dataPath).mkdirs();
  98         return dataPath + "/" + username;
  99     }
 100
 101     public boolean userExists() {
 102         File f = new File(getFileName());
 103         return !(!f.exists() || f.isDirectory());
 104     }
 105
 106     public boolean userHasKeys() {
 107         return signalProtocolStore != null;
 108     }
 109
 110     private JsonNode getNotNullNode(JsonNode parent, String name) throws InvalidObjectException {
 111         JsonNode node = parent.get(name);
 112         if (node == null) {
 113             throw new InvalidObjectException(String.format("Incorrect file format: expected parameter %s not found ", name));
 114         }
 115
 116         return node;
 117     }
 118
 119     public void load() throws IOException, InvalidKeyException {
 120         JsonNode rootNode = jsonProcessot.readTree(new File(getFileName()));
 121
 122         username = getNotNullNode(rootNode, "username").asText();
 123         password = getNotNullNode(rootNode, "password").asText();
 124         if (rootNode.has("signalingKey")) {
 125             signalingKey = getNotNullNode(rootNode, "signalingKey").asText();
 126         }
 127         if (rootNode.has("preKeyIdOffset")) {
 128             preKeyIdOffset = getNotNullNode(rootNode, "preKeyIdOffset").asInt(0);
 129         } else {
 130             preKeyIdOffset = 0;
 131         }
 132         if (rootNode.has("nextSignedPreKeyId")) {
 133             nextSignedPreKeyId = getNotNullNode(rootNode, "nextSignedPreKeyId").asInt();
 134         } else {
 135             nextSignedPreKeyId = 0;
 136         }
 137         signalProtocolStore = jsonProcessot.convertValue(getNotNullNode(rootNode, "axolotlStore"), JsonSignalProtocolStore.class);
 138         registered = getNotNullNode(rootNode, "registered").asBoolean();
 139         JsonNode groupStoreNode = rootNode.get("groupStore");
 140         if (groupStoreNode != null) {
 141             groupStore = jsonProcessot.convertValue(groupStoreNode, JsonGroupStore.class);
 142         }
 143         if (groupStore == null) {
 144             groupStore = new JsonGroupStore();
 145         }
 146         accountManager = new SignalServiceAccountManager(URL, TRUST_STORE, username, password, USER_AGENT);
 147         try {
 148             if (registered && accountManager.getPreKeysCount() < PREKEY_MINIMUM_COUNT) {
 149                 refreshPreKeys();
 150                 save();
 151             }
 152         } catch (AuthorizationFailedException e) {
 153             System.err.println("Authorization failed, was the number registered elsewhere?");
 154         }
 155     }
 156
 157     private void save() {
 158         ObjectNode rootNode = jsonProcessot.createObjectNode();
 159         rootNode.put("username", username)
 160                 .put("password", password)
 161                 .put("signalingKey", signalingKey)
 162                 .put("preKeyIdOffset", preKeyIdOffset)
 163                 .put("nextSignedPreKeyId", nextSignedPreKeyId)
 164                 .put("registered", registered)
 165                 .putPOJO("axolotlStore", signalProtocolStore)
 166                 .putPOJO("groupStore", groupStore)
 167         ;
 168         try {
 169             jsonProcessot.writeValue(new File(getFileName()), rootNode);
 170         } catch (Exception e) {
 171             System.err.println(String.format("Error saving file: %s", e.getMessage()));
 172         }
 173     }
 174
 175     public void createNewIdentity() {
 176         IdentityKeyPair identityKey = KeyHelper.generateIdentityKeyPair();
 177         int registrationId = KeyHelper.generateRegistrationId(false);
 178         signalProtocolStore = new JsonSignalProtocolStore(identityKey, registrationId);
 179         groupStore = new JsonGroupStore();
 180         registered = false;
 181         save();
 182     }
 183
 184     public boolean isRegistered() {
 185         return registered;
 186     }
 187
 188     public void register(boolean voiceVerication) throws IOException {
 189         password = Util.getSecret(18);
 190
 191         accountManager = new SignalServiceAccountManager(URL, TRUST_STORE, username, password, USER_AGENT);
 192
 193         if (voiceVerication)
 194             accountManager.requestVoiceVerificationCode();
 195         else
 196             accountManager.requestSmsVerificationCode();
 197
 198         registered = false;
 199         save();
 200     }
 201
 202     private List<PreKeyRecord> generatePreKeys() {
 203         List<PreKeyRecord> records = new LinkedList<>();
 204
 205         for (int i = 0; i < PREKEY_BATCH_SIZE; i++) {
 206             int preKeyId = (preKeyIdOffset + i) % Medium.MAX_VALUE;
 207             ECKeyPair keyPair = Curve.generateKeyPair();
 208             PreKeyRecord record = new PreKeyRecord(preKeyId, keyPair);
 209
 210             signalProtocolStore.storePreKey(preKeyId, record);
 211             records.add(record);
 212         }
 213
 214         preKeyIdOffset = (preKeyIdOffset + PREKEY_BATCH_SIZE + 1) % Medium.MAX_VALUE;
 215         save();
 216
 217         return records;
 218     }
 219
 220     private PreKeyRecord getOrGenerateLastResortPreKey() {
 221         if (signalProtocolStore.containsPreKey(Medium.MAX_VALUE)) {
 222             try {
 223                 return signalProtocolStore.loadPreKey(Medium.MAX_VALUE);
 224             } catch (InvalidKeyIdException e) {
 225                 signalProtocolStore.removePreKey(Medium.MAX_VALUE);
 226             }
 227         }
 228
 229         ECKeyPair keyPair = Curve.generateKeyPair();
 230         PreKeyRecord record = new PreKeyRecord(Medium.MAX_VALUE, keyPair);
 231
 232         signalProtocolStore.storePreKey(Medium.MAX_VALUE, record);
 233         save();
 234
 235         return record;
 236     }
 237
 238     private SignedPreKeyRecord generateSignedPreKey(IdentityKeyPair identityKeyPair) {
 239         try {
 240             ECKeyPair keyPair = Curve.generateKeyPair();
 241             byte[] signature = Curve.calculateSignature(identityKeyPair.getPrivateKey(), keyPair.getPublicKey().serialize());
 242             SignedPreKeyRecord record = new SignedPreKeyRecord(nextSignedPreKeyId, System.currentTimeMillis(), keyPair, signature);
 243
 244             signalProtocolStore.storeSignedPreKey(nextSignedPreKeyId, record);
 245             nextSignedPreKeyId = (nextSignedPreKeyId + 1) % Medium.MAX_VALUE;
 246             save();
 247
 248             return record;
 249         } catch (InvalidKeyException e) {
 250             throw new AssertionError(e);
 251         }
 252     }
 253
 254     public void verifyAccount(String verificationCode) throws IOException {
 255         verificationCode = verificationCode.replace("-", "");
 256         signalingKey = Util.getSecret(52);
 257         accountManager.verifyAccountWithCode(verificationCode, signalingKey, signalProtocolStore.getLocalRegistrationId(), false, true);
 258
 259         //accountManager.setGcmId(Optional.of(GoogleCloudMessaging.getInstance(this).register(REGISTRATION_ID)));
 260         registered = true;
 261
 262         refreshPreKeys();
 263         save();
 264     }
 265
 266     private void refreshPreKeys() throws IOException {
 267         List<PreKeyRecord> oneTimePreKeys = generatePreKeys();
 268         PreKeyRecord lastResortKey = getOrGenerateLastResortPreKey();
 269         SignedPreKeyRecord signedPreKeyRecord = generateSignedPreKey(signalProtocolStore.getIdentityKeyPair());
 270
 271         accountManager.setPreKeys(signalProtocolStore.getIdentityKeyPair().getPublicKey(), lastResortKey, signedPreKeyRecord, oneTimePreKeys);
 272     }
 273
 274
 275     private static List<SignalServiceAttachment> getSignalServiceAttachments(List<String> attachments) throws AttachmentInvalidException {
 276         List<SignalServiceAttachment> SignalServiceAttachments = null;
 277         if (attachments != null) {
 278             SignalServiceAttachments = new ArrayList<>(attachments.size());
 279             for (String attachment : attachments) {
 280                 try {
 281                     SignalServiceAttachments.add(createAttachment(attachment));
 282                 } catch (IOException e) {
 283                     throw new AttachmentInvalidException(attachment, e);
 284                 }
 285             }
 286         }
 287         return SignalServiceAttachments;
 288     }
 289
 290     private static SignalServiceAttachmentStream createAttachment(String attachment) throws IOException {
 291         File attachmentFile = new File(attachment);
 292         InputStream attachmentStream = new FileInputStream(attachmentFile);
 293         final long attachmentSize = attachmentFile.length();
 294         String mime = Files.probeContentType(Paths.get(attachment));
 295         return new SignalServiceAttachmentStream(attachmentStream, mime, attachmentSize, null);
 296     }
 297
 298     @Override
 299     public void sendGroupMessage(String messageText, List<String> attachments,
 300                                  byte[] groupId)
 301             throws IOException, EncapsulatedExceptions, GroupNotFoundException, AttachmentInvalidException {
 302         final SignalServiceDataMessage.Builder messageBuilder = SignalServiceDataMessage.newBuilder().withBody(messageText);
 303         if (attachments != null) {
 304             messageBuilder.withAttachments(getSignalServiceAttachments(attachments));
 305         }
 306         if (groupId != null) {
 307             SignalServiceGroup group = SignalServiceGroup.newBuilder(SignalServiceGroup.Type.DELIVER)
 308                     .withId(groupId)
 309                     .build();
 310             messageBuilder.asGroupMessage(group);
 311         }
 312         SignalServiceDataMessage message = messageBuilder.build();
 313
 314         sendMessage(message, groupStore.getGroup(groupId).members);
 315     }
 316
 317     public void sendQuitGroupMessage(byte[] groupId) throws GroupNotFoundException, IOException, EncapsulatedExceptions {
 318         SignalServiceGroup group = SignalServiceGroup.newBuilder(SignalServiceGroup.Type.QUIT)
 319                 .withId(groupId)
 320                 .build();
 321
 322         SignalServiceDataMessage message = SignalServiceDataMessage.newBuilder()
 323                 .asGroupMessage(group)
 324                 .build();
 325
 326         sendMessage(message, groupStore.getGroup(groupId).members);
 327     }
 328
 329     public byte[] sendUpdateGroupMessage(byte[] groupId, String name, Collection<String> members, String avatarFile) throws IOException, EncapsulatedExceptions, GroupNotFoundException, AttachmentInvalidException {
 330         GroupInfo g;
 331         if (groupId == null) {
 332             // Create new group
 333             g = new GroupInfo(Util.getSecretBytes(16));
 334             g.members.add(username);
 335         } else {
 336             g = groupStore.getGroup(groupId);
 337         }
 338
 339         if (name != null) {
 340             g.name = name;
 341         }
 342
 343         if (members != null) {
 344             for (String member : members) {
 345                 try {
 346                     g.members.add(canonicalizeNumber(member));
 347                 } catch (InvalidNumberException e) {
 348                     System.err.println("Failed to add member \"" + member + "\" to group: " + e.getMessage());
 349                     System.err.println("Aborting…");
 350                     System.exit(1);
 351                 }
 352             }
 353         }
 354
 355         SignalServiceGroup.Builder group = SignalServiceGroup.newBuilder(SignalServiceGroup.Type.UPDATE)
 356                 .withId(g.groupId)
 357                 .withName(g.name)
 358                 .withMembers(new ArrayList<>(g.members));
 359
 360         if (avatarFile != null) {
 361             try {
 362                 group.withAvatar(createAttachment(avatarFile));
 363                 // TODO
 364                 g.avatarId = 0;
 365             } catch (IOException e) {
 366                 throw new AttachmentInvalidException(avatarFile, e);
 367             }
 368         }
 369
 370         groupStore.updateGroup(g);
 371
 372         SignalServiceDataMessage message = SignalServiceDataMessage.newBuilder()
 373                 .asGroupMessage(group.build())
 374                 .build();
 375
 376         sendMessage(message, g.members);
 377         return g.groupId;
 378     }
 379
 380     @Override
 381     public void sendMessage(String message, List<String> attachments, String recipient)
 382             throws EncapsulatedExceptions, AttachmentInvalidException, IOException {
 383         List<String> recipients = new ArrayList<>(1);
 384         recipients.add(recipient);
 385         sendMessage(message, attachments, recipients);
 386     }
 387
 388     @Override
 389     public void sendMessage(String messageText, List<String> attachments,
 390                             List<String> recipients)
 391             throws IOException, EncapsulatedExceptions, AttachmentInvalidException {
 392         final SignalServiceDataMessage.Builder messageBuilder = SignalServiceDataMessage.newBuilder().withBody(messageText);
 393         if (attachments != null) {
 394             messageBuilder.withAttachments(getSignalServiceAttachments(attachments));
 395         }
 396         SignalServiceDataMessage message = messageBuilder.build();
 397
 398         sendMessage(message, recipients);
 399     }
 400
 401     @Override
 402     public void sendEndSessionMessage(List<String> recipients) throws IOException, EncapsulatedExceptions {
 403         SignalServiceDataMessage message = SignalServiceDataMessage.newBuilder()
 404                 .asEndSessionMessage()
 405                 .build();
 406
 407         sendMessage(message, recipients);
 408     }
 409
 410     private void sendMessage(SignalServiceDataMessage message, Collection<String> recipients)
 411             throws IOException, EncapsulatedExceptions {
 412         SignalServiceMessageSender messageSender = new SignalServiceMessageSender(URL, TRUST_STORE, username, password,
 413                 signalProtocolStore, USER_AGENT, Optional.<SignalServiceMessageSender.EventListener>absent());
 414
 415         Set<SignalServiceAddress> recipientsTS = new HashSet<>(recipients.size());
 416         for (String recipient : recipients) {
 417             try {
 418                 recipientsTS.add(getPushAddress(recipient));
 419             } catch (InvalidNumberException e) {
 420                 System.err.println("Failed to add recipient \"" + recipient + "\": " + e.getMessage());
 421                 System.err.println("Aborting sending.");
 422                 save();
 423                 return;
 424             }
 425         }
 426
 427         messageSender.sendMessage(new ArrayList<>(recipientsTS), message);
 428
 429         if (message.isEndSession()) {
 430             for (SignalServiceAddress recipient : recipientsTS) {
 431                 handleEndSession(recipient.getNumber());
 432             }
 433         }
 434         save();
 435     }
 436
 437     private SignalServiceContent decryptMessage(SignalServiceEnvelope envelope) {
 438         SignalServiceCipher cipher = new SignalServiceCipher(new SignalServiceAddress(username), signalProtocolStore);
 439         try {
 440             return cipher.decrypt(envelope);
 441         } catch (Exception e) {
 442             // TODO handle all exceptions
 443             e.printStackTrace();
 444             return null;
 445         }
 446     }
 447
 448     private void handleEndSession(String source) {
 449         signalProtocolStore.deleteAllSessions(source);
 450     }
 451
 452     public interface ReceiveMessageHandler {
 453         void handleMessage(SignalServiceEnvelope envelope, SignalServiceContent decryptedContent, GroupInfo group);
 454     }
 455
 456     public void receiveMessages(int timeoutSeconds, boolean returnOnTimeout, ReceiveMessageHandler handler) throws IOException {
 457         final SignalServiceMessageReceiver messageReceiver = new SignalServiceMessageReceiver(URL, TRUST_STORE, username, password, signalingKey, USER_AGENT);
 458         SignalServiceMessagePipe messagePipe = null;
 459
 460         try {
 461             messagePipe = messageReceiver.createMessagePipe();
 462
 463             while (true) {
 464                 SignalServiceEnvelope envelope;
 465                 SignalServiceContent content = null;
 466                 GroupInfo group = null;
 467                 try {
 468                     envelope = messagePipe.read(timeoutSeconds, TimeUnit.SECONDS);
 469                     if (!envelope.isReceipt()) {
 470                         content = decryptMessage(envelope);
 471                         if (content != null) {
 472                             if (content.getDataMessage().isPresent()) {
 473                                 SignalServiceDataMessage message = content.getDataMessage().get();
 474                                 if (message.getGroupInfo().isPresent()) {
 475                                     SignalServiceGroup groupInfo = message.getGroupInfo().get();
 476                                     switch (groupInfo.getType()) {
 477                                         case UPDATE:
 478                                             try {
 479                                                 group = groupStore.getGroup(groupInfo.getGroupId());
 480                                             } catch (GroupNotFoundException e) {
 481                                                 group = new GroupInfo(groupInfo.getGroupId());
 482                                             }
 483
 484                                             if (groupInfo.getAvatar().isPresent()) {
 485                                                 SignalServiceAttachment avatar = groupInfo.getAvatar().get();
 486                                                 if (avatar.isPointer()) {
 487                                                     long avatarId = avatar.asPointer().getId();
 488                                                     try {
 489                                                         retrieveAttachment(avatar.asPointer());
 490                                                         group.avatarId = avatarId;
 491                                                     } catch (IOException | InvalidMessageException e) {
 492                                                         System.err.println("Failed to retrieve group avatar (" + avatarId + "): " + e.getMessage());
 493                                                     }
 494                                                 }
 495                                             }
 496
 497                                             if (groupInfo.getName().isPresent()) {
 498                                                 group.name = groupInfo.getName().get();
 499                                             }
 500
 501                                             if (groupInfo.getMembers().isPresent()) {
 502                                                 group.members.addAll(groupInfo.getMembers().get());
 503                                             }
 504
 505                                             groupStore.updateGroup(group);
 506                                             break;
 507                                         case DELIVER:
 508                                             try {
 509                                                 group = groupStore.getGroup(groupInfo.getGroupId());
 510                                             } catch (GroupNotFoundException e) {
 511                                             }
 512                                             break;
 513                                         case QUIT:
 514                                             try {
 515                                                 group = groupStore.getGroup(groupInfo.getGroupId());
 516                                                 group.members.remove(envelope.getSource());
 517                                             } catch (GroupNotFoundException e) {
 518                                             }
 519                                             break;
 520                                     }
 521                                 }
 522                                 if (message.isEndSession()) {
 523                                     handleEndSession(envelope.getSource());
 524                                 }
 525                                 if (message.getAttachments().isPresent()) {
 526                                     for (SignalServiceAttachment attachment : message.getAttachments().get()) {
 527                                         if (attachment.isPointer()) {
 528                                             try {
 529                                                 retrieveAttachment(attachment.asPointer());
 530                                             } catch (IOException | InvalidMessageException e) {
 531                                                 System.err.println("Failed to retrieve attachment (" + attachment.asPointer().getId() + "): " + e.getMessage());
 532                                             }
 533                                         }
 534                                     }
 535                                 }
 536                             }
 537                         }
 538                     }
 539                     save();
 540                     handler.handleMessage(envelope, content, group);
 541                 } catch (TimeoutException e) {
 542                     if (returnOnTimeout)
 543                         return;
 544                 } catch (InvalidVersionException e) {
 545                     System.err.println("Ignoring error: " + e.getMessage());
 546                 }
 547             }
 548         } finally {
 549             if (messagePipe != null)
 550                 messagePipe.shutdown();
 551         }
 552     }
 553
 554     public File getAttachmentFile(long attachmentId) {
 555         return new File(attachmentsPath, attachmentId + "");
 556     }
 557
 558     private File retrieveAttachment(SignalServiceAttachmentPointer pointer) throws IOException, InvalidMessageException {
 559         final SignalServiceMessageReceiver messageReceiver = new SignalServiceMessageReceiver(URL, TRUST_STORE, username, password, signalingKey, USER_AGENT);
 560
 561         File tmpFile = File.createTempFile("ts_attach_" + pointer.getId(), ".tmp");
 562         InputStream input = messageReceiver.retrieveAttachment(pointer, tmpFile);
 563
 564         new File(attachmentsPath).mkdirs();
 565         File outputFile = getAttachmentFile(pointer.getId());
 566         OutputStream output = null;
 567         try {
 568             output = new FileOutputStream(outputFile);
 569             byte[] buffer = new byte[4096];
 570             int read;
 571
 572             while ((read = input.read(buffer)) != -1) {
 573                 output.write(buffer, 0, read);
 574             }
 575         } catch (FileNotFoundException e) {
 576             e.printStackTrace();
 577             return null;
 578         } finally {
 579             if (output != null) {
 580                 output.close();
 581                 output = null;
 582             }
 583             if (!tmpFile.delete()) {
 584                 System.err.println("Failed to delete temp file: " + tmpFile);
 585             }
 586         }
 587         if (pointer.getPreview().isPresent()) {
 588             File previewFile = new File(outputFile + ".preview");
 589             try {
 590                 output = new FileOutputStream(previewFile);
 591                 byte[] preview = pointer.getPreview().get();
 592                 output.write(preview, 0, preview.length);
 593             } catch (FileNotFoundException e) {
 594                 e.printStackTrace();
 595                 return null;
 596             } finally {
 597                 if (output != null) {
 598                     output.close();
 599                 }
 600             }
 601         }
 602         return outputFile;
 603     }
 604
 605     private String canonicalizeNumber(String number) throws InvalidNumberException {
 606         String localNumber = username;
 607         return PhoneNumberFormatter.formatNumber(number, localNumber);
 608     }
 609
 610     private SignalServiceAddress getPushAddress(String number) throws InvalidNumberException {
 611         String e164number = canonicalizeNumber(number);
 612         return new SignalServiceAddress(e164number);
 613     }
 614
 615     @Override
 616     public boolean isRemote() {
 617         return false;
 618     }
 619 }