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479 lines
20 KiB
JavaScript
479 lines
20 KiB
JavaScript
/*
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* vim: ts=4:sw=4:expandtab
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*/
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function MessageReceiver(url, username, password, signalingKey, attachment_server_url) {
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this.url = url;
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this.signalingKey = signalingKey;
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this.username = username;
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this.password = password;
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this.server = new TextSecureServer(url, username, password, attachment_server_url);
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var address = libsignal.SignalProtocolAddress.fromString(username);
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this.number = address.getName();
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this.deviceId = address.getDeviceId();
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}
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MessageReceiver.prototype = new textsecure.EventTarget();
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MessageReceiver.prototype.extend({
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constructor: MessageReceiver,
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connect: function() {
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if (this.socket && this.socket.readyState !== WebSocket.CLOSED) {
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this.socket.close();
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}
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console.log('opening websocket');
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// initialize the socket and start listening for messages
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this.socket = this.server.getMessageSocket();
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this.socket.onclose = this.onclose.bind(this);
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this.socket.onerror = this.onerror.bind(this);
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this.socket.onopen = this.onopen.bind(this);
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this.wsr = new WebSocketResource(this.socket, {
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handleRequest: this.handleRequest.bind(this),
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keepalive: { path: '/v1/keepalive', disconnect: true }
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});
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this.pending = Promise.resolve();
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},
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close: function() {
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this.socket.close(3000, 'called close');
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delete this.listeners;
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},
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onopen: function() {
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console.log('websocket open');
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},
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onerror: function(error) {
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console.log('websocket error');
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},
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onclose: function(ev) {
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console.log('websocket closed', ev.code, ev.reason || '');
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if (ev.code === 3000) {
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return;
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}
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var eventTarget = this;
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// possible 403 or network issue. Make an request to confirm
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this.server.getDevices(this.number).
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then(this.connect.bind(this)). // No HTTP error? Reconnect
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catch(function(e) {
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var ev = new Event('error');
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ev.error = e;
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eventTarget.dispatchEvent(ev);
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});
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},
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handleRequest: function(request) {
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// We do the message decryption here, instead of in the ordered pending queue,
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// to avoid exposing the time it took us to process messages through the time-to-ack.
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// TODO: handle different types of requests. for now we blindly assume
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// PUT /messages <encrypted Envelope>
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textsecure.crypto.decryptWebsocketMessage(request.body, this.signalingKey).then(function(plaintext) {
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var envelope = textsecure.protobuf.Envelope.decode(plaintext);
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// After this point, decoding errors are not the server's
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// fault, and we should handle them gracefully and tell the
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// user they received an invalid message
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request.respond(200, 'OK');
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this.queueEnvelope(envelope);
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}.bind(this)).catch(function(e) {
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request.respond(500, 'Bad encrypted websocket message');
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console.log("Error handling incoming message:", e);
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var ev = new Event('error');
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ev.error = e;
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this.dispatchEvent(ev);
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}.bind(this));
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},
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queueEnvelope: function(envelope) {
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var handleEnvelope = this.handleEnvelope.bind(this, envelope);
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this.pending = this.pending.then(handleEnvelope, handleEnvelope);
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},
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handleEnvelope: function(envelope) {
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if (envelope.type === textsecure.protobuf.Envelope.Type.RECEIPT) {
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return this.onDeliveryReceipt(envelope);
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}
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if (envelope.content) {
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return this.handleContentMessage(envelope);
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} else if (envelope.legacyMessage) {
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return this.handleLegacyMessage(envelope);
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} else {
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throw new Error('Received message with no content and no legacyMessage');
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}
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},
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getStatus: function() {
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if (this.socket) {
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return this.socket.readyState;
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} else {
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return -1;
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}
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},
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onDeliveryReceipt: function (envelope) {
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var ev = new Event('receipt');
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ev.proto = envelope;
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this.dispatchEvent(ev);
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},
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unpad: function(paddedPlaintext) {
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paddedPlaintext = new Uint8Array(paddedPlaintext);
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var plaintext;
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for (var i = paddedPlaintext.length - 1; i >= 0; i--) {
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if (paddedPlaintext[i] == 0x80) {
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plaintext = new Uint8Array(i);
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plaintext.set(paddedPlaintext.subarray(0, i));
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plaintext = plaintext.buffer;
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break;
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} else if (paddedPlaintext[i] !== 0x00) {
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throw new Error('Invalid padding');
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}
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}
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return plaintext;
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},
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decrypt: function(envelope, ciphertext) {
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var promise;
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var address = new libsignal.SignalProtocolAddress(envelope.source, envelope.sourceDevice);
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var sessionCipher = new libsignal.SessionCipher(textsecure.storage.protocol, address);
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switch(envelope.type) {
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case textsecure.protobuf.Envelope.Type.CIPHERTEXT:
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console.log('message from', envelope.source + '.' + envelope.sourceDevice, envelope.timestamp.toNumber());
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promise = sessionCipher.decryptWhisperMessage(ciphertext).then(this.unpad);
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break;
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case textsecure.protobuf.Envelope.Type.PREKEY_BUNDLE:
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console.log('prekey message from', envelope.source + '.' + envelope.sourceDevice, envelope.timestamp.toNumber());
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promise = this.decryptPreKeyWhisperMessage(ciphertext, sessionCipher, address);
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break;
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default:
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promise = Promise.reject(new Error("Unknown message type"));
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}
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return promise.catch(function(error) {
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var ev = new Event('error');
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ev.error = error;
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ev.proto = envelope;
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this.dispatchEvent(ev);
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return Promise.reject(error);
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}.bind(this));
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},
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decryptPreKeyWhisperMessage: function(ciphertext, sessionCipher, address) {
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return sessionCipher.decryptPreKeyWhisperMessage(ciphertext).then(this.unpad).catch(function(e) {
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if (e.message === 'Unknown identity key') {
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// create an error that the UI will pick up and ask the
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// user if they want to re-negotiate
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throw new textsecure.IncomingIdentityKeyError(
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address.toString(),
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ciphertext.toArrayBuffer(),
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e.identityKey
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);
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}
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throw e;
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});
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},
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handleSentMessage: function(destination, timestamp, message) {
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var p = Promise.resolve();
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if ((message.flags & textsecure.protobuf.DataMessage.Flags.END_SESSION) ==
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textsecure.protobuf.DataMessage.Flags.END_SESSION ) {
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p = this.handleEndSession(destination);
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}
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return p.then(function() {
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return this.processDecrypted(message, this.number).then(function(message) {
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var ev = new Event('sent');
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ev.data = {
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destination : destination,
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timestamp : timestamp.toNumber(),
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message : message
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};
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this.dispatchEvent(ev);
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}.bind(this));
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}.bind(this));
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},
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handleDataMessage: function(envelope, message) {
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var encodedNumber = envelope.source + '.' + envelope.sourceDevice;
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console.log('data message from', encodedNumber, envelope.timestamp.toNumber());
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var p = Promise.resolve();
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if ((message.flags & textsecure.protobuf.DataMessage.Flags.END_SESSION) ==
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textsecure.protobuf.DataMessage.Flags.END_SESSION ) {
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p = this.handleEndSession(envelope.source);
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}
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return p.then(function() {
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return this.processDecrypted(message, envelope.source).then(function(message) {
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var ev = new Event('message');
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ev.data = {
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source : envelope.source,
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timestamp : envelope.timestamp.toNumber(),
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message : message
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};
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this.dispatchEvent(ev);
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}.bind(this));
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}.bind(this));
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},
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handleLegacyMessage: function (envelope) {
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return this.decrypt(envelope, envelope.legacyMessage).then(function(plaintext) {
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var message = textsecure.protobuf.DataMessage.decode(plaintext);
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return this.handleDataMessage(envelope, message);
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}.bind(this));
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},
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handleContentMessage: function (envelope) {
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return this.decrypt(envelope, envelope.content).then(function(plaintext) {
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var content = textsecure.protobuf.Content.decode(plaintext);
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if (content.syncMessage) {
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return this.handleSyncMessage(envelope, content.syncMessage);
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} else if (content.dataMessage) {
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return this.handleDataMessage(envelope, content.dataMessage);
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} else {
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throw new Error('Got Content message with no dataMessage and no syncMessage');
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}
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}.bind(this));
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},
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handleSyncMessage: function(envelope, syncMessage) {
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if (envelope.source !== this.number) {
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throw new Error('Received sync message from another number');
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}
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if (envelope.sourceDevice == this.deviceId) {
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throw new Error('Received sync message from our own device');
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}
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if (syncMessage.sent) {
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var sentMessage = syncMessage.sent;
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console.log('sent message to',
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sentMessage.destination,
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sentMessage.timestamp.toNumber(),
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'from', envelope.source + '.' + envelope.sourceDevice
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);
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return this.handleSentMessage(
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sentMessage.destination,
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sentMessage.timestamp,
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sentMessage.message
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);
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} else if (syncMessage.contacts) {
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this.handleContacts(syncMessage.contacts);
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} else if (syncMessage.groups) {
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this.handleGroups(syncMessage.groups);
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} else if (syncMessage.request) {
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console.log('Got SyncMessage Request');
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} else if (syncMessage.read) {
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console.log('read messages',
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'from', envelope.source + '.' + envelope.sourceDevice);
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this.handleRead(syncMessage.read);
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} else {
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throw new Error('Got empty SyncMessage');
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}
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},
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handleRead: function(read) {
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for (var i = 0; i < read.length; ++i) {
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var ev = new Event('read');
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ev.timestamp = read[i].timestamp;
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ev.sender = read[i].sender;
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this.dispatchEvent(ev);
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}
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},
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handleContacts: function(contacts) {
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console.log('contact sync');
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var eventTarget = this;
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var attachmentPointer = contacts.blob;
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return this.handleAttachment(attachmentPointer).then(function() {
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var contactBuffer = new ContactBuffer(attachmentPointer.data);
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var contactDetails = contactBuffer.next();
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while (contactDetails !== undefined) {
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var ev = new Event('contact');
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ev.contactDetails = contactDetails;
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eventTarget.dispatchEvent(ev);
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contactDetails = contactBuffer.next();
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}
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eventTarget.dispatchEvent(new Event('contactsync'));
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});
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},
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handleGroups: function(groups) {
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console.log('group sync');
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var eventTarget = this;
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var attachmentPointer = groups.blob;
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return this.handleAttachment(attachmentPointer).then(function() {
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var groupBuffer = new GroupBuffer(attachmentPointer.data);
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var groupDetails = groupBuffer.next();
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var promises = [];
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while (groupDetails !== undefined) {
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var promise = (function(groupDetails) {
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groupDetails.id = groupDetails.id.toBinary();
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if (groupDetails.active) {
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return textsecure.storage.groups.getGroup(groupDetails.id).
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then(function(existingGroup) {
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if (existingGroup === undefined) {
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return textsecure.storage.groups.createNewGroup(
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groupDetails.members, groupDetails.id
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);
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} else {
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return textsecure.storage.groups.updateNumbers(
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groupDetails.id, groupDetails.members
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);
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}
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}).then(function() { return groupDetails });
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} else {
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return Promise.resolve(groupDetails);
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}
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})(groupDetails).then(function(groupDetails) {
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var ev = new Event('group');
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ev.groupDetails = groupDetails;
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eventTarget.dispatchEvent(ev);
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}).catch(function(e) {
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console.log('error processing group', e);
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});
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groupDetails = groupBuffer.next();
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promises.push(promise);
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}
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Promise.all(promises).then(function() {
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eventTarget.dispatchEvent(new Event('groupsync'));
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});
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});
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},
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handleAttachment: function(attachment) {
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function decryptAttachment(encrypted) {
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return textsecure.crypto.decryptAttachment(
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encrypted,
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attachment.key.toArrayBuffer()
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);
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}
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function updateAttachment(data) {
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attachment.data = data;
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}
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return this.server.getAttachment(attachment.id.toString()).
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then(decryptAttachment).
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then(updateAttachment);
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},
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tryMessageAgain: function(from, ciphertext) {
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var address = libsignal.SignalProtocolAddress.fromString(from);
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var sessionCipher = new libsignal.SessionCipher(textsecure.storage.protocol, address);
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console.log('retrying prekey whisper message');
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return this.decryptPreKeyWhisperMessage(ciphertext, sessionCipher, address).then(function(plaintext) {
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var finalMessage = textsecure.protobuf.DataMessage.decode(plaintext);
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var p = Promise.resolve();
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if ((finalMessage.flags & textsecure.protobuf.DataMessage.Flags.END_SESSION)
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== textsecure.protobuf.DataMessage.Flags.END_SESSION &&
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finalMessage.sync !== null) {
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var number = address.getName();
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p = this.handleEndSession(number);
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}
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return p.then(function() {
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return this.processDecrypted(finalMessage);
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}.bind(this));
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}.bind(this));
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},
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handleEndSession: function(number) {
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console.log('got end session');
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return textsecure.storage.protocol.getDeviceIds(number).then(function(deviceIds) {
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return Promise.all(deviceIds.map(function(deviceId) {
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var address = new libsignal.SignalProtocolAddress(number, deviceId);
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var sessionCipher = new libsignal.SessionCipher(textsecure.storage.protocol, address);
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console.log('closing session for', address.toString());
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return sessionCipher.closeOpenSessionForDevice();
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}));
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});
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},
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processDecrypted: function(decrypted, source) {
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// Now that its decrypted, validate the message and clean it up for consumer processing
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// Note that messages may (generally) only perform one action and we ignore remaining fields
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// after the first action.
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if (decrypted.flags == null)
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decrypted.flags = 0;
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if ((decrypted.flags & textsecure.protobuf.DataMessage.Flags.END_SESSION)
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== textsecure.protobuf.DataMessage.Flags.END_SESSION) {
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decrypted.body = null;
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decrypted.attachments = [];
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decrypted.group = null;
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return Promise.resolve(decrypted);
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}
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if (decrypted.flags != 0) {
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throw new Error("Unknown flags in message");
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}
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var promises = [];
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if (decrypted.group !== null) {
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decrypted.group.id = decrypted.group.id.toBinary();
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if (decrypted.group.type == textsecure.protobuf.GroupContext.Type.UPDATE) {
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if (decrypted.group.avatar !== null) {
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promises.push(this.handleAttachment(decrypted.group.avatar));
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}
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}
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promises.push(textsecure.storage.groups.getNumbers(decrypted.group.id).then(function(existingGroup) {
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if (existingGroup === undefined) {
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if (decrypted.group.type != textsecure.protobuf.GroupContext.Type.UPDATE) {
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decrypted.group.members = [source];
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console.log("Got message for unknown group");
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}
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return textsecure.storage.groups.createNewGroup(decrypted.group.members, decrypted.group.id);
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} else {
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var fromIndex = existingGroup.indexOf(source);
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if (fromIndex < 0) {
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//TODO: This could be indication of a race...
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console.log("Sender was not a member of the group they were sending from");
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}
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switch(decrypted.group.type) {
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case textsecure.protobuf.GroupContext.Type.UPDATE:
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return textsecure.storage.groups.updateNumbers(
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decrypted.group.id, decrypted.group.members
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).then(function(added) {
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decrypted.group.added = added;
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if (decrypted.group.avatar === null &&
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decrypted.group.added.length == 0 &&
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decrypted.group.name === null) {
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return;
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}
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decrypted.body = null;
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decrypted.attachments = [];
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});
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break;
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case textsecure.protobuf.GroupContext.Type.QUIT:
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decrypted.body = null;
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decrypted.attachments = [];
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if (source === this.number) {
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return textsecure.storage.groups.deleteGroup(decrypted.group.id);
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} else {
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return textsecure.storage.groups.removeNumber(decrypted.group.id, source);
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}
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case textsecure.protobuf.GroupContext.Type.DELIVER:
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decrypted.group.name = null;
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decrypted.group.members = [];
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decrypted.group.avatar = null;
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break;
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default:
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throw new Error("Unknown group message type");
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}
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}
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}.bind(this)));
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}
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for (var i in decrypted.attachments) {
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promises.push(this.handleAttachment(decrypted.attachments[i]));
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}
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return Promise.all(promises).then(function() {
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return decrypted;
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});
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}
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});
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window.textsecure = window.textsecure || {};
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textsecure.MessageReceiver = function(url, username, password, signalingKey, attachment_server_url) {
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var messageReceiver = new MessageReceiver(url, username, password, signalingKey, attachment_server_url);
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this.addEventListener = messageReceiver.addEventListener.bind(messageReceiver);
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this.removeEventListener = messageReceiver.removeEventListener.bind(messageReceiver);
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this.getStatus = messageReceiver.getStatus.bind(messageReceiver);
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this.close = messageReceiver.close.bind(messageReceiver);
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messageReceiver.connect();
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textsecure.replay.registerFunction(messageReceiver.tryMessageAgain.bind(messageReceiver), textsecure.replay.Type.INIT_SESSION);
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};
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textsecure.MessageReceiver.prototype = {
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constructor: textsecure.MessageReceiver
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};
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