/*
* vim: ts=4:sw=4:expandtab
*/
;(function () {
'use strict';
window.textsecure = window.textsecure || {};
function MessageReceiver(url, username, password, signalingKey) {
this.url = url;
this.signalingKey = signalingKey;
this.username = username;
this.password = password;
var unencoded = textsecure.utils.unencodeNumber(username);
this.number = unencoded[0];
this.deviceId = unencoded[1];
this.connect();
}
MessageReceiver.prototype = {
constructor: MessageReceiver,
connect: function() {
// initialize the socket and start listening for messages
if (this.socket && this.socket.readyState !== WebSocket.CLOSED) {
this.socket.close();
}
console.log('opening websocket');
this.socket = new WebSocket(
this.url.replace('https://', 'wss://').replace('http://', 'ws://')
+ '/v1/websocket/?login=' + encodeURIComponent(this.username)
+ '&password=' + encodeURIComponent(this.password)
);
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 }
});
},
close: function() {
this.socket.close();
delete this.listeners;
},
onopen: function() {
console.log('websocket open');
},
onerror: function(error) {
console.log('websocket error', error);
this.socketError = error;
},
onclose: function(ev) {
var eventTarget = this;
console.log('websocket closed', ev.code);
// possible 403 or network issue. Make an request to confirm
TextSecureServer.getDevices(this.number).
then(this.connect.bind(this)). // No HTTP error? Reconnect
catch(function(e) {
var ev = new Event('error');
ev.error = e;
eventTarget.dispatchEvent(ev);
});
},
handleRequest: function(request) {
this.wsr.resetKeepAliveTimer();
// TODO: handle different types of requests. for now we only expect
// PUT /messages <encrypted IncomingPushMessageSignal>
textsecure.crypto.decryptWebsocketMessage(request.body, this.signalingKey).then(function(plaintext) {
var 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
request.respond(200, 'OK');
if (envelope.type === textsecure.protobuf.Envelope.Type.RECEIPT) {
this.onDeliveryReceipt(envelope);
} else if (envelope.content) {
this.handleContentMessage(envelope);
} else if (envelope.legacyMessage) {
this.handleLegacyMessage(envelope);
} else {
throw new Error('Received message with no content and no legacyMessage');
}
}.bind(this)).catch(function(e) {
request.respond(500, 'Bad encrypted websocket message');
console.log("Error handling incoming message:", e);
var ev = new Event('error');
ev.error = e;
this.dispatchEvent(ev);
}.bind(this));
},
getStatus: function() {
if (this.socket) {
return this.socket.readyState;
} else {
return -1;
}
},
onDeliveryReceipt: function (envelope) {
var ev = new Event('receipt');
ev.proto = envelope;
this.dispatchEvent(ev);
},
decrypt: function(envelope, ciphertext) {
return textsecure.protocol_wrapper.decrypt(
envelope.source,
envelope.sourceDevice,
envelope.type,
ciphertext
).catch(function(error) {
var ev = new Event('error');
ev.error = error;
ev.proto = envelope;
this.dispatchEvent(ev);
throw error; // reject this promise
}.bind(this));
},
handleSentMessage: function(destination, timestamp, message) {
return processDecrypted(message, this.number).then(function(message) {
var ev = new Event('sent');
ev.data = {
destination : destination,
timestamp : timestamp.toNumber(),
message : message
};
this.dispatchEvent(ev);
}.bind(this));
},
handleDataMessage: function(envelope, message, close_session) {
if ((message.flags & textsecure.protobuf.DataMessage.Flags.END_SESSION)
== textsecure.protobuf.DataMessage.Flags.END_SESSION ) {
close_session();
}
return processDecrypted(message, envelope.source).then(function(message) {
var ev = new Event('message');
ev.data = {
source : envelope.source,
timestamp : envelope.timestamp.toNumber(),
message : message
};
this.dispatchEvent(ev);
}.bind(this));
},
handleLegacyMessage: function (envelope) {
return this.decrypt(envelope, envelope.legacyMessage).then(function(result) {
var plaintext = result[0]; // array buffer
var close_session = result[1]; // function
var message = textsecure.protobuf.DataMessage.decode(plaintext);
return this.handleDataMessage(envelope, message, close_session);
}.bind(this));
},
handleContentMessage: function (envelope) {
return this.decrypt(envelope, envelope.content).then(function(result) {
var plaintext = result[0]; // array buffer
var close_session = result[1]; // function
var 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, close_session);
} else {
throw new Error('Got Content message with no dataMessage and no syncMessage');
}
}.bind(this));
},
handleSyncMessage: function(envelope, syncMessage) {
if (envelope.source !== this.number) {
throw new Error('Received sync message from another number');
}
if (envelope.sourceDevice == this.deviceId) {
throw new Error('Received sync message from our own device');
}
if (syncMessage.sent) {
var sentMessage = syncMessage.sent;
return this.handleSentMessage(
sentMessage.destination,
sentMessage.timestamp,
sentMessage.message
);
} else if (syncMessage.contacts) {
this.handleContacts(syncMessage.contacts);
} else if (syncMessage.groups) {
this.handleGroups(syncMessage.groups);
} else {
throw new Error('Got SyncMessage with no sent, contacts, or groups');
}
},
handleContacts: function(contacts) {
var eventTarget = this;
var attachmentPointer = contacts.blob;
return handleAttachment(attachmentPointer).then(function() {
var contactBuffer = new ContactBuffer(attachmentPointer.data);
var contactDetails = contactBuffer.next();
while (contactDetails !== undefined) {
var ev = new Event('contact');
ev.contactDetails = contactDetails;
eventTarget.dispatchEvent(ev);
contactDetails = contactBuffer.next();
}
eventTarget.dispatchEvent(new Event('contactsync'));
});
},
handleGroups: function(groups) {
var eventTarget = this;
var attachmentPointer = groups.blob;
return handleAttachment(attachmentPointer).then(function() {
var groupBuffer = new GroupBuffer(attachmentPointer.data);
var groupDetails = groupBuffer.next();
while (groupDetails !== undefined) {
(function(groupDetails) {
groupDetails.id = getString(groupDetails.id);
textsecure.storage.groups.getGroup(groupDetails.id).
then(function(existingGroup) {
if (existingGroup === undefined) {
return textsecure.storage.groups.createNewGroup(
groupDetails.members, groupDetails.id
);
} else {
return textsecure.storage.groups.updateNumbers(
groupDetails.id, groupDetails.members
);
}
}).then(function() {
var ev = new Event('group');
ev.groupDetails = groupDetails;
eventTarget.dispatchEvent(ev);
});
})(groupDetails);
groupDetails = groupBuffer.next();
}
});
},
/* Implements EventTarget */
dispatchEvent: function(ev) {
if (!(ev instanceof Event)) {
throw new Error('Expects an event');
}
if (this.listeners === null || typeof this.listeners !== 'object') {
this.listeners = {};
}
var listeners = this.listeners[ev.type];
if (typeof listeners === 'object') {
for (var i=0; i < listeners.length; ++i) {
if (typeof listeners[i] === 'function') {
listeners[i].call(null, ev);
}
}
}
},
addEventListener: function(eventName, callback) {
if (typeof eventName !== 'string') {
throw new Error('First argument expects a string');
}
if (typeof callback !== 'function') {
throw new Error('Second argument expects a function');
}
if (this.listeners === null || typeof this.listeners !== 'object') {
this.listeners = {};
}
var listeners = this.listeners[eventName];
if (typeof listeners !== 'object') {
listeners = [];
}
listeners.push(callback);
this.listeners[eventName] = listeners;
},
removeEventListener: function(eventName, callback) {
if (typeof eventName !== 'string') {
throw new Error('First argument expects a string');
}
if (typeof callback !== 'function') {
throw new Error('Second argument expects a function');
}
if (this.listeners === null || typeof this.listeners !== 'object') {
this.listeners = {};
}
var listeners = this.listeners[eventName];
for (var i=0; i < listeners.length; ++ i) {
if (listeners[i] === callback) {
listeners.splice(i, 1);
return;
}
}
this.listeners[eventName] = listeners;
}
};
textsecure.MessageReceiver = function(url, username, password, signalingKey) {
var messageReceiver = new MessageReceiver(url, username, password, signalingKey);
this.addEventListener = messageReceiver.addEventListener.bind(messageReceiver);
this.removeEventListener = messageReceiver.removeEventListener.bind(messageReceiver);
this.getStatus = messageReceiver.getStatus.bind(messageReceiver);
}
textsecure.MessageReceiver.prototype = {
constructor: textsecure.MessageReceiver
};
}());