/* global window: false */
/* global textsecure: false */
/* global TextSecureServer: false */
/* global libsignal: false */
/* global WebSocketResource: false */
/* global WebSocket: false */
/* global Event: false */
/* global dcodeIO: false */
/* global _: false */
/* global ContactBuffer: false */
/* global GroupBuffer: false */
/* eslint-disable more/no-then */
function MessageReceiver(url, username, password, signalingKey, options = {}) {
this.count = 0;
this.url = url;
this.signalingKey = signalingKey;
this.username = username;
this.password = password;
this.server = new TextSecureServer(url, username, password);
const address = libsignal.SignalProtocolAddress.fromString(username);
this.number = address.getName();
this.deviceId = address.getDeviceId();
this.pending = Promise.resolve();
if (options.retryCached) {
this.pending = this.queueAllCached();
}
}
MessageReceiver.prototype = new textsecure.EventTarget();
MessageReceiver.prototype.extend({
constructor: MessageReceiver,
connect() {
if (this.calledClose) {
return;
}
this.hasConnected = true;
if (this.socket && this.socket.readyState !== WebSocket.CLOSED) {
this.socket.close();
this.wsr.close();
}
// initialize the socket and start listening for messages
this.socket = this.server.getMessageSocket();
this.socket.onclose = this.onclose.bind(this);
this.socket.onerror = this.onerror.bind(this);
this.socket.onopen = this.onopen.bind(this);
this.wsr = new WebSocketResource(this.socket, {
handleRequest: this.handleRequest.bind(this),
keepalive: {
path: '/v1/keepalive',
disconnect: true,
},
});
// Because sometimes the socket doesn't properly emit its close event
this._onClose = this.onclose.bind(this);
this.wsr.addEventListener('close', this._onClose);
// Ensures that an immediate 'empty' event from the websocket will fire only after
// all cached envelopes are processed.
this.incoming = [this.pending];
},
shutdown() {
if (this.socket) {
this.socket.onclose = null;
this.socket.onerror = null;
this.socket.onopen = null;
this.socket = null;
}
if (this.wsr) {
this.wsr.removeEventListener('close', this._onClose);
this.wsr = null;
}
},
close() {
console.log('MessageReceiver.close()');
this.calledClose = true;
// Our WebSocketResource instance will close the socket and emit a 'close' event
// if the socket doesn't emit one quickly enough.
if (this.wsr) {
this.wsr.close(3000, 'called close');
}
return this.drain();
},
onopen() {
console.log('websocket open');
},
onerror() {
console.log('websocket error');
},
dispatchAndWait(event) {
return Promise.all(this.dispatchEvent(event));
},
onclose(ev) {
console.log(
'websocket closed',
ev.code,
ev.reason || '',
'calledClose:',
this.calledClose
);
this.shutdown();
if (this.calledClose) {
return Promise.resolve();
}
if (ev.code === 3000) {
return Promise.resolve();
}
if (ev.code === 3001) {
this.onEmpty();
}
// possible 403 or network issue. Make an request to confirm
return this.server.getDevices(this.number)
.then(this.connect.bind(this)) // No HTTP error? Reconnect
.catch((e) => {
const event = new Event('error');
event.error = e;
return this.dispatchAndWait(event);
});
},
handleRequest(request) {
this.incoming = this.incoming || [];
// We do the message decryption here, instead of in the ordered pending queue,
// to avoid exposing the time it took us to process messages through the time-to-ack.
// TODO: handle different types of requests.
if (request.path !== '/api/v1/message') {
console.log('got request', request.verb, request.path);
request.respond(200, 'OK');
if (request.verb === 'PUT' && request.path === '/api/v1/queue/empty') {
this.onEmpty();
}
return;
}
const promise = textsecure.crypto.decryptWebsocketMessage(
request.body,
this.signalingKey
).then((plaintext) => {
const envelope = textsecure.protobuf.Envelope.decode(plaintext);
// After this point, decoding errors are not the server's
// fault, and we should handle them gracefully and tell the
// user they received an invalid message
if (this.isBlocked(envelope.source)) {
return request.respond(200, 'OK');
}
return this.addToCache(envelope, plaintext).then(() => {
request.respond(200, 'OK');
this.queueEnvelope(envelope);
}, (error) => {
console.log(
'handleRequest error trying to add message to cache:',
error && error.stack ? error.stack : error
);
});
}).catch((e) => {
request.respond(500, 'Bad encrypted websocket message');
console.log('Error handling incoming message:', e && e.stack ? e.stack : e);
const ev = new Event('error');
ev.error = e;
return this.dispatchAndWait(ev);
});
this.incoming.push(promise);
},
addToQueue(task) {
this.count += 1;
this.pending = this.pending.then(task, task);
const { count, pending } = this;
const cleanup = () => {
this.updateProgress(count);
// We want to clear out the promise chain whenever possible because it could
// lead to large memory usage over time:
// https://github.com/nodejs/node/issues/6673#issuecomment-244331609
if (this.pending === pending) {
this.pending = Promise.resolve();
}
};
pending.then(cleanup, cleanup);
return pending;
},
onEmpty() {
const { incoming } = this;
this.incoming = [];
const dispatchEmpty = () => {
console.log('MessageReceiver: emitting \'empty\' event');
const ev = new Event('empty');
return this.dispatchAndWait(ev);
};
const queueDispatch = () => {
// resetting count to zero so everything queued after this starts over again
this.count = 0;
this.addToQueue(dispatchEmpty);
};
// We first wait for all recently-received messages (this.incoming) to be queued,
// then we add a task to emit the 'empty' event to the queue, so all message
// processing is complete by the time it runs.
Promise.all(incoming).then(queueDispatch, queueDispatch);
},
drain() {
const { incoming } = this;
this.incoming = [];
const queueDispatch = () => this.addToQueue(() => {
console.log('drained');
});
// This promise will resolve when there are no more messages to be processed.
return Promise.all(incoming).then(queueDispatch, queueDispatch);
},
updateProgress(count) {
// count by 10s
if (count % 10 !== 0) {
return;
}
const ev = new Event('progress');
ev.count = count;
this.dispatchEvent(ev);
},
queueAllCached() {
return this.getAllFromCache().then((items) => {
for (let i = 0, max = items.length; i < max; i += 1) {
this.queueCached(items[i]);
}
});
},
queueCached(item) {
try {
let envelopePlaintext = item.envelope;
// Up until 0.42.6 we stored envelope and decrypted as strings in IndexedDB,
// so we need to be ready for them.
if (typeof envelopePlaintext === 'string') {
envelopePlaintext = this.stringToArrayBuffer(envelopePlaintext);
}
const envelope = textsecure.protobuf.Envelope.decode(envelopePlaintext);
const { decrypted } = item;
if (decrypted) {
let payloadPlaintext = decrypted;
if (typeof payloadPlaintext === 'string') {
payloadPlaintext = this.stringToArrayBuffer(payloadPlaintext);
}
this.queueDecryptedEnvelope(envelope, payloadPlaintext);
} else {
this.queueEnvelope(envelope);
}
} catch (error) {
console.log('queueCached error handling item', item.id);
}
},
getEnvelopeId(envelope) {
return `${envelope.source}.${envelope.sourceDevice} ${envelope.timestamp.toNumber()}`;
},
stringToArrayBuffer(string) {
// eslint-disable-next-line new-cap
return new dcodeIO.ByteBuffer.wrap(string, 'binary').toArrayBuffer();
},
getAllFromCache() {
console.log('getAllFromCache');
return textsecure.storage.unprocessed.getAll().then((items) => {
console.log('getAllFromCache loaded', items.length, 'saved envelopes');
return Promise.all(_.map(items, (item) => {
const attempts = 1 + (item.attempts || 0);
if (attempts >= 5) {
console.log('getAllFromCache final attempt for envelope', item.id);
return textsecure.storage.unprocessed.remove(item.id);
}
return textsecure.storage.unprocessed.update(item.id, { attempts });
})).then(() => items, (error) => {
console.log(
'getAllFromCache error updating items after load:',
error && error.stack ? error.stack : error
);
return items;
});
});
},
addToCache(envelope, plaintext) {
const id = this.getEnvelopeId(envelope);
const data = {
id,
envelope: plaintext,
timestamp: Date.now(),
attempts: 1,
};
return textsecure.storage.unprocessed.add(data);
},
updateCache(envelope, plaintext) {
const id = this.getEnvelopeId(envelope);
const data = {
decrypted: plaintext,
};
return textsecure.storage.unprocessed.update(id, data);
},
removeFromCache(envelope) {
const id = this.getEnvelopeId(envelope);
return textsecure.storage.unprocessed.remove(id);
},
queueDecryptedEnvelope(envelope, plaintext) {
const id = this.getEnvelopeId(envelope);
console.log('queueing decrypted envelope', id);
const task = this.handleDecryptedEnvelope.bind(this, envelope, plaintext);
const taskWithTimeout = textsecure.createTaskWithTimeout(
task,
`queueEncryptedEnvelope ${id}`
);
const promise = this.addToQueue(taskWithTimeout);
return promise.catch((error) => {
console.log(
'queueDecryptedEnvelope error handling envelope',
id,
':',
error && error.stack ? error.stack : error
);
});
},
queueEnvelope(envelope) {
const id = this.getEnvelopeId(envelope);
console.log('queueing envelope', id);
const task = this.handleEnvelope.bind(this, envelope);
const taskWithTimeout = textsecure.createTaskWithTimeout(task, `queueEnvelope ${id}`);
const promise = this.addToQueue(taskWithTimeout);
return promise.catch((error) => {
console.log(
'queueEnvelope error handling envelope',
id,
':',
error && error.stack ? error.stack : error
);
});
},
// Same as handleEnvelope, just without the decryption step. Necessary for handling
// messages which were successfully decrypted, but application logic didn't finish
// processing.
handleDecryptedEnvelope(envelope, plaintext) {
// No decryption is required for delivery receipts, so the decrypted field of
// the Unprocessed model will never be set
if (envelope.content) {
return this.innerHandleContentMessage(envelope, plaintext);
} else if (envelope.legacyMessage) {
return this.innerHandleLegacyMessage(envelope, plaintext);
}
this.removeFromCache(envelope);
throw new Error('Received message with no content and no legacyMessage');
},
handleEnvelope(envelope) {
if (envelope.type === textsecure.protobuf.Envelope.Type.RECEIPT) {
return this.onDeliveryReceipt(envelope);
}
if (envelope.content) {
return this.handleContentMessage(envelope);
} else if (envelope.legacyMessage) {
return this.handleLegacyMessage(envelope);
}
this.removeFromCache(envelope);
throw new Error('Received message with no content and no legacyMessage');
},
getStatus() {
if (this.socket) {
return this.socket.readyState;
} else if (this.hasConnected) {
return WebSocket.CLOSED;
}
return -1;
},
onDeliveryReceipt(envelope) {
return new Promise((resolve, reject) => {
const ev = new Event('delivery');
ev.confirm = this.removeFromCache.bind(this, envelope);
ev.deliveryReceipt = {
timestamp: envelope.timestamp.toNumber(),
source: envelope.source,
sourceDevice: envelope.sourceDevice,
};
this.dispatchAndWait(ev).then(resolve, reject);
});
},
unpad(paddedData) {
const paddedPlaintext = new Uint8Array(paddedData);
let plaintext;
for (let i = paddedPlaintext.length - 1; i >= 0; i -= 1) {
if (paddedPlaintext[i] === 0x80) {
plaintext = new Uint8Array(i);
plaintext.set(paddedPlaintext.subarray(0, i));
plaintext = plaintext.buffer;
break;
} else if (paddedPlaintext[i] !== 0x00) {
throw new Error('Invalid padding');
}
}
return plaintext;
},
decrypt(envelope, ciphertext) {
let promise;
const address = new libsignal.SignalProtocolAddress(
envelope.source,
envelope.sourceDevice
);
const ourNumber = textsecure.storage.user.getNumber();
const number = address.toString().split('.')[0];
const options = {};
// No limit on message keys if we're communicating with our other devices
if (ourNumber === number) {
options.messageKeysLimit = false;
}
const sessionCipher = new libsignal.SessionCipher(
textsecure.storage.protocol,
address,
options
);
switch (envelope.type) {
case textsecure.protobuf.Envelope.Type.CIPHERTEXT:
console.log('message from', this.getEnvelopeId(envelope));
promise = sessionCipher.decryptWhisperMessage(ciphertext).then(this.unpad);
break;
case textsecure.protobuf.Envelope.Type.PREKEY_BUNDLE:
console.log('prekey message from', this.getEnvelopeId(envelope));
promise = this.decryptPreKeyWhisperMessage(ciphertext, sessionCipher, address);
break;
default:
promise = Promise.reject(new Error('Unknown message type'));
}
return promise.then(plaintext => this.updateCache(
envelope,
plaintext
).then(() => plaintext, (error) => {
console.log(
'decrypt failed to save decrypted message contents to cache:',
error && error.stack ? error.stack : error
);
return plaintext;
})).catch((error) => {
let errorToThrow = error;
if (error.message === 'Unknown identity key') {
// create an error that the UI will pick up and ask the
// user if they want to re-negotiate
const buffer = dcodeIO.ByteBuffer.wrap(ciphertext);
errorToThrow = new textsecure.IncomingIdentityKeyError(
address.toString(),
buffer.toArrayBuffer(),
error.identityKey
);
}
const ev = new Event('error');
ev.error = errorToThrow;
ev.proto = envelope;
ev.confirm = this.removeFromCache.bind(this, envelope);
const returnError = () => Promise.reject(errorToThrow);
return this.dispatchAndWait(ev).then(returnError, returnError);
});
},
async decryptPreKeyWhisperMessage(ciphertext, sessionCipher, address) {
const padded = await sessionCipher.decryptPreKeyWhisperMessage(ciphertext);
try {
return this.unpad(padded);
} catch (e) {
if (e.message === 'Unknown identity key') {
// create an error that the UI will pick up and ask the
// user if they want to re-negotiate
const buffer = dcodeIO.ByteBuffer.wrap(ciphertext);
throw new textsecure.IncomingIdentityKeyError(
address.toString(),
buffer.toArrayBuffer(),
e.identityKey
);
}
throw e;
}
},
handleSentMessage(envelope, destination, timestamp, msg, expirationStartTimestamp) {
let p = Promise.resolve();
// eslint-disable-next-line no-bitwise
if (msg.flags & textsecure.protobuf.DataMessage.Flags.END_SESSION) {
p = this.handleEndSession(destination);
}
return p.then(() => this.processDecrypted(
envelope,
msg,
this.number
).then((message) => {
const ev = new Event('sent');
ev.confirm = this.removeFromCache.bind(this, envelope);
ev.data = {
destination,
timestamp: timestamp.toNumber(),
device: envelope.sourceDevice,
message,
};
if (expirationStartTimestamp) {
ev.data.expirationStartTimestamp = expirationStartTimestamp.toNumber();
}
return this.dispatchAndWait(ev);
}));
},
handleDataMessage(envelope, msg) {
console.log('data message from', this.getEnvelopeId(envelope));
let p = Promise.resolve();
// eslint-disable-next-line no-bitwise
if (msg.flags & textsecure.protobuf.DataMessage.Flags.END_SESSION) {
p = this.handleEndSession(envelope.source);
}
return p.then(() => this.processDecrypted(
envelope,
msg,
envelope.source
).then((message) => {
const ev = new Event('message');
ev.confirm = this.removeFromCache.bind(this, envelope);
ev.data = {
source: envelope.source,
sourceDevice: envelope.sourceDevice,
timestamp: envelope.timestamp.toNumber(),
receivedAt: envelope.receivedAt,
message,
};
return this.dispatchAndWait(ev);
}));
},
handleLegacyMessage(envelope) {
return this.decrypt(
envelope,
envelope.legacyMessage
).then(plaintext => this.innerHandleLegacyMessage(envelope, plaintext));
},
innerHandleLegacyMessage(envelope, plaintext) {
const message = textsecure.protobuf.DataMessage.decode(plaintext);
return this.handleDataMessage(envelope, message);
},
handleContentMessage(envelope) {
return this.decrypt(
envelope,
envelope.content
).then(plaintext => this.innerHandleContentMessage(envelope, plaintext));
},
innerHandleContentMessage(envelope, plaintext) {
const content = textsecure.protobuf.Content.decode(plaintext);
if (content.syncMessage) {
return this.handleSyncMessage(envelope, content.syncMessage);
} else if (content.dataMessage) {
return this.handleDataMessage(envelope, content.dataMessage);
} else if (content.nullMessage) {
return this.handleNullMessage(envelope, content.nullMessage);
} else if (content.callMessage) {
return this.handleCallMessage(envelope, content.callMessage);
} else if (content.receiptMessage) {
return this.handleReceiptMessage(envelope, content.receiptMessage);
}
this.removeFromCache(envelope);
throw new Error('Unsupported content message');
},
handleCallMessage(envelope) {
console.log('call message from', this.getEnvelopeId(envelope));
this.removeFromCache(envelope);
},
handleReceiptMessage(envelope, receiptMessage) {
const results = [];
if (receiptMessage.type === textsecure.protobuf.ReceiptMessage.Type.DELIVERY) {
for (let i = 0; i < receiptMessage.timestamp.length; i += 1) {
const ev = new Event('delivery');
ev.confirm = this.removeFromCache.bind(this, envelope);
ev.deliveryReceipt = {
timestamp: receiptMessage.timestamp[i].toNumber(),
source: envelope.source,
sourceDevice: envelope.sourceDevice,
};
results.push(this.dispatchAndWait(ev));
}
} else if (receiptMessage.type === textsecure.protobuf.ReceiptMessage.Type.READ) {
for (let i = 0; i < receiptMessage.timestamp.length; i += 1) {
const ev = new Event('read');
ev.confirm = this.removeFromCache.bind(this, envelope);
ev.timestamp = envelope.timestamp.toNumber();
ev.read = {
timestamp: receiptMessage.timestamp[i].toNumber(),
reader: envelope.source,
};
results.push(this.dispatchAndWait(ev));
}
}
return Promise.all(results);
},
handleNullMessage(envelope) {
console.log('null message from', this.getEnvelopeId(envelope));
this.removeFromCache(envelope);
},
handleSyncMessage(envelope, syncMessage) {
if (envelope.source !== this.number) {
throw new Error('Received sync message from another number');
}
// eslint-disable-next-line eqeqeq
if (envelope.sourceDevice == this.deviceId) {
throw new Error('Received sync message from our own device');
}
if (syncMessage.sent) {
const sentMessage = syncMessage.sent;
const to = sentMessage.message.group
? `group(${sentMessage.message.group.id.toBinary()})`
: sentMessage.destination;
console.log(
'sent message to',
to,
sentMessage.timestamp.toNumber(),
'from',
this.getEnvelopeId(envelope)
);
return this.handleSentMessage(
envelope,
sentMessage.destination,
sentMessage.timestamp,
sentMessage.message,
sentMessage.expirationStartTimestamp
);
} else if (syncMessage.contacts) {
return this.handleContacts(envelope, syncMessage.contacts);
} else if (syncMessage.groups) {
return this.handleGroups(envelope, syncMessage.groups);
} else if (syncMessage.blocked) {
return this.handleBlocked(envelope, syncMessage.blocked);
} else if (syncMessage.request) {
console.log('Got SyncMessage Request');
return this.removeFromCache(envelope);
} else if (syncMessage.read && syncMessage.read.length) {
console.log('read messages from', this.getEnvelopeId(envelope));
return this.handleRead(envelope, syncMessage.read);
} else if (syncMessage.verified) {
return this.handleVerified(envelope, syncMessage.verified);
} else if (syncMessage.configuration) {
return this.handleConfiguration(envelope, syncMessage.configuration);
}
throw new Error('Got empty SyncMessage');
},
handleConfiguration(envelope, configuration) {
const ev = new Event('configuration');
ev.confirm = this.removeFromCache.bind(this, envelope);
ev.configuration = {
readReceipts: configuration.readReceipts,
};
return this.dispatchAndWait(ev);
},
handleVerified(envelope, verified) {
const ev = new Event('verified');
ev.confirm = this.removeFromCache.bind(this, envelope);
ev.verified = {
state: verified.state,
destination: verified.destination,
identityKey: verified.identityKey.toArrayBuffer(),
};
return this.dispatchAndWait(ev);
},
handleRead(envelope, read) {
const results = [];
for (let i = 0; i < read.length; i += 1) {
const ev = new Event('readSync');
ev.confirm = this.removeFromCache.bind(this, envelope);
ev.timestamp = envelope.timestamp.toNumber();
ev.read = {
timestamp: read[i].timestamp.toNumber(),
sender: read[i].sender,
};
results.push(this.dispatchAndWait(ev));
}
return Promise.all(results);
},
handleContacts(envelope, contacts) {
console.log('contact sync');
const attachmentPointer = contacts.blob;
return this.handleAttachment(attachmentPointer).then(() => {
const results = [];
const contactBuffer = new ContactBuffer(attachmentPointer.data);
let contactDetails = contactBuffer.next();
while (contactDetails !== undefined) {
const ev = new Event('contact');
ev.confirm = this.removeFromCache.bind(this, envelope);
ev.contactDetails = contactDetails;
results.push(this.dispatchAndWait(ev));
contactDetails = contactBuffer.next();
}
const ev = new Event('contactsync');
ev.confirm = this.removeFromCache.bind(this, envelope);
results.push(this.dispatchAndWait(ev));
return Promise.all(results);
});
},
handleGroups(envelope, groups) {
console.log('group sync');
const attachmentPointer = groups.blob;
return this.handleAttachment(attachmentPointer).then(() => {
const groupBuffer = new GroupBuffer(attachmentPointer.data);
let groupDetails = groupBuffer.next();
const promises = [];
while (groupDetails !== undefined) {
const getGroupDetails = (details) => {
// eslint-disable-next-line no-param-reassign
details.id = details.id.toBinary();
if (details.active) {
return textsecure.storage.groups.getGroup(details.id)
.then((existingGroup) => {
if (existingGroup === undefined) {
return textsecure.storage.groups.createNewGroup(
details.members,
details.id
);
}
return textsecure.storage.groups.updateNumbers(
details.id,
details.members
);
}).then(() => details);
}
return Promise.resolve(details);
};
const promise = getGroupDetails(groupDetails).then((details) => {
const ev = new Event('group');
ev.confirm = this.removeFromCache.bind(this, envelope);
ev.groupDetails = details;
return this.dispatchAndWait(ev);
}).catch((e) => {
console.log('error processing group', e);
});
groupDetails = groupBuffer.next();
promises.push(promise);
}
Promise.all(promises).then(() => {
const ev = new Event('groupsync');
ev.confirm = this.removeFromCache.bind(this, envelope);
return this.dispatchAndWait(ev);
});
});
},
handleBlocked(envelope, blocked) {
console.log('Setting these numbers as blocked:', blocked.numbers);
textsecure.storage.put('blocked', blocked.numbers);
},
isBlocked(number) {
return textsecure.storage.get('blocked', []).indexOf(number) >= 0;
},
handleAttachment(attachment) {
// eslint-disable-next-line no-param-reassign
attachment.id = attachment.id.toString();
// eslint-disable-next-line no-param-reassign
attachment.key = attachment.key.toArrayBuffer();
if (attachment.digest) {
// eslint-disable-next-line no-param-reassign
attachment.digest = attachment.digest.toArrayBuffer();
}
function decryptAttachment(encrypted) {
return textsecure.crypto.decryptAttachment(
encrypted,
attachment.key,
attachment.digest
);
}
function updateAttachment(data) {
// eslint-disable-next-line no-param-reassign
attachment.data = data;
}
return this.server.getAttachment(attachment.id)
.then(decryptAttachment)
.then(updateAttachment);
},
validateRetryContentMessage(content) {
// Today this is only called for incoming identity key errors, so it can't be a sync
// message.
if (content.syncMessage) {
return false;
}
// We want at least one field set, but not more than one
let count = 0;
count += content.dataMessage ? 1 : 0;
count += content.callMessage ? 1 : 0;
count += content.nullMessage ? 1 : 0;
if (count !== 1) {
return false;
}
// It's most likely that dataMessage will be populated, so we look at it in detail
const data = content.dataMessage;
if (data && !data.attachments.length && !data.body && !data.expireTimer &&
!data.flags && !data.group) {
return false;
}
return true;
},
tryMessageAgain(from, ciphertext, message) {
const address = libsignal.SignalProtocolAddress.fromString(from);
const sentAt = message.sent_at || Date.now();
const receivedAt = message.received_at || Date.now();
const ourNumber = textsecure.storage.user.getNumber();
const number = address.getName();
const device = address.getDeviceId();
const options = {};
// No limit on message keys if we're communicating with our other devices
if (ourNumber === number) {
options.messageKeysLimit = false;
}
const sessionCipher = new libsignal.SessionCipher(
textsecure.storage.protocol,
address,
options
);
console.log('retrying prekey whisper message');
return this.decryptPreKeyWhisperMessage(
ciphertext,
sessionCipher,
address
).then((plaintext) => {
const envelope = {
source: number,
sourceDevice: device,
receivedAt,
timestamp: {
toNumber() {
return sentAt;
},
},
};
// Before June, all incoming messages were still DataMessage:
// - iOS: Michael Kirk says that they were sending Legacy messages until June
// - Desktop: https://github.com/signalapp/Signal-Desktop/commit/e8548879db405d9bcd78b82a456ad8d655592c0f
// - Android: https://github.com/signalapp/libsignal-service-java/commit/61a75d023fba950ff9b4c75a249d1a3408e12958
//
// var d = new Date('2017-06-01T07:00:00.000Z');
// d.getTime();
const startOfJune = 1496300400000;
if (sentAt < startOfJune) {
return this.innerHandleLegacyMessage(envelope, plaintext);
}
// This is ugly. But we don't know what kind of proto we need to decode...
try {
// Simply decoding as a Content message may throw
const content = textsecure.protobuf.Content.decode(plaintext);
// But it might also result in an invalid object, so we try to detect that
if (this.validateRetryContentMessage(content)) {
return this.innerHandleContentMessage(envelope, plaintext);
}
} catch (e) {
return this.innerHandleLegacyMessage(envelope, plaintext);
}
return this.innerHandleLegacyMessage(envelope, plaintext);
});
},
async handleEndSession(number) {
console.log('got end session');
const deviceIds = await textsecure.storage.protocol.getDeviceIds(number);
return Promise.all(deviceIds.map((deviceId) => {
const address = new libsignal.SignalProtocolAddress(number, deviceId);
const sessionCipher = new libsignal.SessionCipher(
textsecure.storage.protocol,
address
);
console.log('deleting sessions for', address.toString());
return sessionCipher.deleteAllSessionsForDevice();
}));
},
processDecrypted(envelope, decrypted, source) {
/* eslint-disable no-bitwise, no-param-reassign */
const FLAGS = textsecure.protobuf.DataMessage.Flags;
// Now that its decrypted, validate the message and clean it up for consumer
// processing
// Note that messages may (generally) only perform one action and we ignore remaining
// fields after the first action.
if (decrypted.flags == null) {
decrypted.flags = 0;
}
if (decrypted.expireTimer == null) {
decrypted.expireTimer = 0;
}
if (decrypted.flags & FLAGS.END_SESSION) {
decrypted.body = null;
decrypted.attachments = [];
decrypted.group = null;
return Promise.resolve(decrypted);
} else if (decrypted.flags & FLAGS.EXPIRATION_TIMER_UPDATE) {
decrypted.body = null;
decrypted.attachments = [];
} else if (decrypted.flags & FLAGS.PROFILE_KEY_UPDATE) {
decrypted.body = null;
decrypted.attachments = [];
} else if (decrypted.flags !== 0) {
throw new Error('Unknown flags in message');
}
const promises = [];
if (decrypted.group !== null) {
decrypted.group.id = decrypted.group.id.toBinary();
if (decrypted.group.type === textsecure.protobuf.GroupContext.Type.UPDATE) {
if (decrypted.group.avatar !== null) {
promises.push(this.handleAttachment(decrypted.group.avatar));
}
}
const storageGroups = textsecure.storage.groups;
promises.push(storageGroups.getNumbers(decrypted.group.id).then((existingGroup) => {
if (existingGroup === undefined) {
if (decrypted.group.type !== textsecure.protobuf.GroupContext.Type.UPDATE) {
decrypted.group.members = [source];
console.log('Got message for unknown group');
}
return textsecure.storage.groups.createNewGroup(
decrypted.group.members,
decrypted.group.id
);
}
const fromIndex = existingGroup.indexOf(source);
if (fromIndex < 0) {
// TODO: This could be indication of a race...
console.log('Sender was not a member of the group they were sending from');
}
switch (decrypted.group.type) {
case textsecure.protobuf.GroupContext.Type.UPDATE:
decrypted.body = null;
decrypted.attachments = [];
return textsecure.storage.groups.updateNumbers(
decrypted.group.id,
decrypted.group.members
);
case textsecure.protobuf.GroupContext.Type.QUIT:
decrypted.body = null;
decrypted.attachments = [];
if (source === this.number) {
return textsecure.storage.groups.deleteGroup(decrypted.group.id);
}
return textsecure.storage.groups.removeNumber(decrypted.group.id, source);
case textsecure.protobuf.GroupContext.Type.DELIVER:
decrypted.group.name = null;
decrypted.group.members = [];
decrypted.group.avatar = null;
return Promise.resolve();
default:
this.removeFromCache(envelope);
throw new Error('Unknown group message type');
}
}));
}
for (let i = 0, max = decrypted.attachments.length; i < max; i += 1) {
const attachment = decrypted.attachments[i];
promises.push(this.handleAttachment(attachment));
}
if (decrypted.quote && decrypted.quote.id) {
decrypted.quote.id = decrypted.quote.id.toNumber();
}
if (decrypted.quote && decrypted.quote.attachments) {
const { attachments } = decrypted.quote;
for (let i = 0, max = attachments.length; i < max; i += 1) {
const attachment = attachments[i];
const { thumbnail } = attachment;
if (thumbnail) {
// We don't want the failure of a thumbnail download to fail the handling of
// this message entirely, like we do for full attachments.
promises.push(this.handleAttachment(thumbnail).catch((error) => {
console.log(
'Problem loading thumbnail for quote',
error && error.stack ? error.stack : error
);
}));
}
}
}
return Promise.all(promises).then(() => decrypted);
/* eslint-enable no-bitwise, no-param-reassign */
},
});
window.textsecure = window.textsecure || {};
textsecure.MessageReceiver = function MessageReceiverWrapper(
url,
username,
password,
signalingKey,
options
) {
const messageReceiver = new MessageReceiver(
url,
username,
password,
signalingKey,
options
);
this.addEventListener = messageReceiver.addEventListener.bind(messageReceiver);
this.removeEventListener = messageReceiver.removeEventListener.bind(messageReceiver);
this.getStatus = messageReceiver.getStatus.bind(messageReceiver);
this.close = messageReceiver.close.bind(messageReceiver);
messageReceiver.connect();
textsecure.replay.registerFunction(
messageReceiver.tryMessageAgain.bind(messageReceiver),
textsecure.replay.Type.INIT_SESSION
);
};
textsecure.MessageReceiver.prototype = {
constructor: textsecure.MessageReceiver,
};