322 lines
11 KiB
JavaScript
322 lines
11 KiB
JavaScript
/*
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* Copyright 2014 XWiki SAS
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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define([
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'/common/messages.js',
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// TODO remove in favour of netflux
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'/bower_components/reconnectingWebsocket/reconnecting-websocket.js',
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'/common/crypto.js',
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'/common/toolbar.js',
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'/common/sharejs_textarea.js',
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'/common/chainpad.js',
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'/bower_components/jquery/dist/jquery.min.js',
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], function (Messages,/*FIXME*/ ReconnectingWebSocket, Crypto, Toolbar, sharejs) {
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var $ = window.jQuery;
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var ChainPad = window.ChainPad;
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var PARANOIA = true;
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var module = { exports: {} };
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/**
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* If an error is encountered but it is recoverable, do not immediately fail
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* but if it keeps firing errors over and over, do fail.
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*/
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var MAX_RECOVERABLE_ERRORS = 15;
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/** Maximum number of milliseconds of lag before we fail the connection. */
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var MAX_LAG_BEFORE_DISCONNECT = 20000;
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var debug = function (x) { console.log(x); },
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warn = function (x) { console.error(x); },
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verbose = function (x) { /*console.log(x);*/ };
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// ------------------ Trapping Keyboard Events ---------------------- //
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var bindEvents = function (element, events, callback, unbind) {
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for (var i = 0; i < events.length; i++) {
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var e = events[i];
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if (element.addEventListener) {
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if (unbind) {
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element.removeEventListener(e, callback, false);
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} else {
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element.addEventListener(e, callback, false);
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}
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} else {
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if (unbind) {
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element.detachEvent('on' + e, callback);
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} else {
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element.attachEvent('on' + e, callback);
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}
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}
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}
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};
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var bindAllEvents = function (textarea, docBody, onEvent, unbind)
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{
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/*
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we use docBody for the purposes of CKEditor.
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because otherwise special keybindings like ctrl-b and ctrl-i
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would open bookmarks and info instead of applying bold/italic styles
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*/
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if (docBody) {
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bindEvents(docBody,
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['textInput', 'keydown', 'keyup', 'select', 'cut', 'paste'],
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onEvent,
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unbind);
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}
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bindEvents(textarea,
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['mousedown','mouseup','click','change'],
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onEvent,
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unbind);
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};
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/* websocket stuff */
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var isSocketDisconnected = function (socket, realtime) {
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var sock = socket._socket;
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return sock.readyState === sock.CLOSING
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|| sock.readyState === sock.CLOSED
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|| (realtime.getLag().waiting && realtime.getLag().lag > MAX_LAG_BEFORE_DISCONNECT);
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};
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// this differs from other functions with similar names in that
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// you are expected to pass a socket into it.
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var checkSocket = function (socket) {
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if (isSocketDisconnected(socket, socket.realtime) &&
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!socket.intentionallyClosing) {
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return true;
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} else {
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return false;
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}
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};
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// TODO before removing websocket implementation
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// bind abort to onLeaving
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var abort = function (socket, realtime) {
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realtime.abort();
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try { socket._socket.close(); } catch (e) { warn(e); }
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};
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var handleError = function (socket, realtime, err, docHTML, allMessages) {
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// var internalError = createDebugInfo(err, realtime, docHTML, allMessages);
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abort(socket, realtime);
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};
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var makeWebsocket = function (url) {
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var socket = new ReconnectingWebSocket(url);
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var out = {
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onOpen: [],
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onClose: [],
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onError: [],
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onMessage: [],
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send: function (msg) { socket.send(msg); },
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close: function () { socket.close(); },
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_socket: socket
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};
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var mkHandler = function (name) {
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return function (evt) {
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for (var i = 0; i < out[name].length; i++) {
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if (out[name][i](evt) === false) {
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console.log(name +"Handler");
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return;
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}
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}
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};
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};
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socket.onopen = mkHandler('onOpen');
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socket.onclose = mkHandler('onClose');
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socket.onerror = mkHandler('onError');
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socket.onmessage = mkHandler('onMessage');
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return out;
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};
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/* end websocket stuff */
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var start = module.exports.start =
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function (textarea, websocketUrl, userName, channel, cryptKey, config)
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{
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var passwd = 'y';
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// make sure configuration is defined
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config = config || {};
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var doc = config.doc || null;
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// trying to deprecate onRemote, prefer loading it via the conf
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var onRemote = config.onRemote || null;
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var transformFunction = config.transformFunction || null;
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var socket;
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if (config.socketAdaptor) {
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// do netflux stuff
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} else {
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socket = makeWebsocket(websocketUrl);
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}
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// define this in case it gets called before the rest of our stuff is ready.
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var onEvent = function () { };
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var allMessages = [];
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var isErrorState = false;
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var initializing = true;
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var recoverableErrorCount = 0;
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var $textarea = $(textarea);
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var bump = function () {};
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socket.onOpen.push(function (evt) {
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if (!initializing) {
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console.log("Starting");
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// realtime is passed around as an attribute of the socket
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// FIXME??
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socket.realtime.start();
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return;
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}
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var realtime = socket.realtime = ChainPad.create(userName,
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passwd,
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channel,
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$(textarea).val(),
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{
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transformFunction: config.transformFunction
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});
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if (config.onInit) {
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// extend as you wish
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config.onInit({
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realtime: realtime
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});
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}
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onEvent = function () {
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// This looks broken
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if (isErrorState || initializing) { return; }
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};
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realtime.onUserListChange(function (userList) {
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if (!initializing || userList.indexOf(userName) === -1) {
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return;
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}
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// if we spot ourselves being added to the document, we'll switch
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// 'initializing' off because it means we're fully synced.
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initializing = false;
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// execute an onReady callback if one was supplied
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// pass an object so we can extend this later
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if (config.onReady) {
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// extend as you wish
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config.onReady({
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userList: userList
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});
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}
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});
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var whoami = new RegExp(userName.replace(/[\/\+]/g, function (c) {
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return '\\' +c;
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}));
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// when you receive a message...
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socket.onMessage.push(function (evt) {
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verbose(evt.data);
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if (isErrorState) { return; }
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var message = Crypto.decrypt(evt.data, cryptKey);
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verbose(message);
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allMessages.push(message);
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if (!initializing) {
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if (PARANOIA) {
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onEvent();
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}
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}
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realtime.message(message);
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if (/\[5,/.test(message)) { verbose("pong"); }
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if (!initializing) {
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if (/\[2,/.test(message)) {
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//verbose("Got a patch");
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if (whoami.test(message)) {
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//verbose("Received own message");
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} else {
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//verbose("Received remote message");
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// obviously this is only going to get called if
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if (onRemote) { onRemote(realtime.getUserDoc()); }
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}
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}
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}
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});
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// when a message is ready to send
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realtime.onMessage(function (message) {
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if (isErrorState) { return; }
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message = Crypto.encrypt(message, cryptKey);
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try {
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socket.send(message);
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} catch (e) {
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warn(e);
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}
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});
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// actual socket bindings
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socket.onmessage = function (evt) {
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for (var i = 0; i < socket.onMessage.length; i++) {
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if (socket.onMessage[i](evt) === false) { return; }
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}
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};
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socket.onclose = function (evt) {
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for (var i = 0; i < socket.onMessage.length; i++) {
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if (socket.onClose[i](evt) === false) { return; }
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}
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};
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socket.onerror = warn;
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// TODO confirm that we can rely on netflux API
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var socketChecker = setInterval(function () {
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if (checkSocket(socket)) {
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warn("Socket disconnected!");
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recoverableErrorCount += 1;
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if (recoverableErrorCount >= MAX_RECOVERABLE_ERRORS) {
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warn("Giving up!");
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abort(socket, realtime);
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if (socketChecker) { clearInterval(socketChecker); }
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}
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} else {
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// TODO
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}
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},200);
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bindAllEvents(textarea, doc, onEvent, false);
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// attach textarea
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// NOTE: should be able to remove the websocket without damaging this
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sharejs.attach(textarea, realtime);
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realtime.start();
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debug('started');
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bump = realtime.bumpSharejs;
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});
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return {
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onEvent: function () {
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onEvent();
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},
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bumpSharejs: function () { bump(); }
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};
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};
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return module.exports;
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});
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