mirror of https://github.com/xwiki-labs/cryptpad
310 lines
11 KiB
JavaScript
310 lines
11 KiB
JavaScript
;(function () { 'use strict';
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const Crypto = require('crypto');
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const Nacl = require('tweetnacl');
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const LAG_MAX_BEFORE_DISCONNECT = 30000;
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const LAG_MAX_BEFORE_PING = 15000;
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const HISTORY_KEEPER_ID = Crypto.randomBytes(8).toString('hex');
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const USE_HISTORY_KEEPER = true;
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const USE_FILE_BACKUP_STORAGE = true;
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let dropUser;
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let historyKeeperKeys = {};
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const now = function () { return (new Date()).getTime(); };
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const socketSendable = function (socket) {
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return socket && socket.readyState === 1;
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};
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const sendMsg = function (ctx, user, msg) {
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if (!socketSendable(user.socket)) { return; }
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try {
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if (ctx.config.logToStdout) { console.log('<' + JSON.stringify(msg)); }
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user.socket.send(JSON.stringify(msg));
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} catch (e) {
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console.log(e.stack);
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dropUser(ctx, user);
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}
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};
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const storeMessage = function (ctx, channel, msg) {
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ctx.store.message(channel.id, msg, function (err) {
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if (err && typeof(err) !== 'function') {
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// ignore functions because older datastores
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// might pass waitFors into the callback
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console.log("Error writing message: " + err);
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}
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});
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};
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const sendChannelMessage = function (ctx, channel, msgStruct) {
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msgStruct.unshift(0);
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channel.forEach(function (user) {
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if(msgStruct[2] !== 'MSG' || user.id !== msgStruct[1]) { // We don't want to send back a message to its sender, in order to save bandwidth
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sendMsg(ctx, user, msgStruct);
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}
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});
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if (USE_HISTORY_KEEPER && msgStruct[2] === 'MSG') {
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if (historyKeeperKeys[channel.id]) {
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let signedMsg = msgStruct[4].replace(/^cp\|/, '');
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signedMsg = Nacl.util.decodeBase64(signedMsg);
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let validateKey = Nacl.util.decodeBase64(historyKeeperKeys[channel.id]);
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let validated = Nacl.sign.open(signedMsg, validateKey);
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if (!validated) {
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console.log("Signed message rejected");
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return;
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}
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}
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storeMessage(ctx, channel, JSON.stringify(msgStruct));
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}
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};
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dropUser = function (ctx, user) {
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if (user.socket.readyState !== 2 /* WebSocket.CLOSING */
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&& user.socket.readyState !== 3 /* WebSocket.CLOSED */)
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{
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try {
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user.socket.close();
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} catch (e) {
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console.log("Failed to disconnect ["+user.id+"], attempting to terminate");
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try {
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user.socket.terminate();
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} catch (ee) {
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console.log("Failed to terminate ["+user.id+"] *shrug*");
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}
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}
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}
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delete ctx.users[user.id];
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Object.keys(ctx.channels).forEach(function (chanName) {
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let chan = ctx.channels[chanName];
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let idx = chan.indexOf(user);
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if (idx < 0) { return; }
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if (ctx.config.verbose) {
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console.log("Removing ["+user.id+"] from channel ["+chanName+"]");
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}
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chan.splice(idx, 1);
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if (chan.length === 0) {
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if (ctx.config.verbose) {
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console.log("Removing empty channel ["+chanName+"]");
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}
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delete ctx.channels[chanName];
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delete historyKeeperKeys[chanName];
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/* Call removeChannel if it is a function and channel removal is
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set to true in the config file */
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if (ctx.config.removeChannels) {
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if (typeof(ctx.store.removeChannel) === 'function') {
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ctx.timeouts[chanName] = setTimeout(function () {
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ctx.store.removeChannel(chanName, function (err) {
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if (err) { console.error("[removeChannelErr]: %s", err); }
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else {
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if (ctx.config.verbose) {
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console.log("Deleted channel [%s] history from database...", chanName);
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}
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}
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});
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}, ctx.config.channelRemovalTimeout);
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} else {
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console.error("You have configured your server to remove empty channels, " +
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"however, the database adaptor you are using has not implemented this behaviour.");
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}
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}
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} else {
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sendChannelMessage(ctx, chan, [user.id, 'LEAVE', chanName, 'Quit: [ dropUser() ]']);
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}
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});
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};
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const getHistory = function (ctx, channelName, handler, cb) {
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var messageBuf = [];
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var messageKey;
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ctx.store.getMessages(channelName, function (msgStr) {
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var parsed = JSON.parse(msgStr);
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if (parsed.validateKey) {
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historyKeeperKeys[channelName] = parsed.validateKey;
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handler(parsed);
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return;
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}
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messageBuf.push(parsed);
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}, function (err) {
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if (err) {
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console.log("Error getting messages " + err.stack);
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// TODO: handle this better
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}
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var startPoint;
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var cpCount = 0;
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var msgBuff2 = [];
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for (startPoint = messageBuf.length - 1; startPoint >= 0; startPoint--) {
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var msg = messageBuf[startPoint];
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msgBuff2.push(msg);
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if (msg[2] === 'MSG' && msg[4].indexOf('cp|') === 0) {
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cpCount++;
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if (cpCount >= 2) {
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for (var x = msgBuff2.pop(); x; x = msgBuff2.pop()) { handler(x); }
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break;
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}
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}
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//console.log(messageBuf[startPoint]);
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}
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if (cpCount < 2) {
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// no checkpoints.
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for (var x = msgBuff2.pop(); x; x = msgBuff2.pop()) { handler(x); }
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}
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cb(messageBuf);
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});
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};
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const randName = function () { return Crypto.randomBytes(16).toString('hex'); };
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const handleMessage = function (ctx, user, msg) {
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let json = JSON.parse(msg);
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let seq = json.shift();
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let cmd = json[0];
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let obj = json[1];
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user.timeOfLastMessage = now();
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user.pingOutstanding = false;
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if (cmd === 'JOIN') {
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if (obj && obj.length !== 32) {
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sendMsg(ctx, user, [seq, 'ERROR', 'ENOENT', obj]);
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return;
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}
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let chanName = obj || randName();
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sendMsg(ctx, user, [seq, 'JACK', chanName]);
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let chan = ctx.channels[chanName] = ctx.channels[chanName] || [];
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// prevent removal of the channel if there is a pending timeout
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if (ctx.config.removeChannels && ctx.timeouts[chanName]) {
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clearTimeout(ctx.timeouts[chanName]);
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}
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chan.id = chanName;
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if (USE_HISTORY_KEEPER) {
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sendMsg(ctx, user, [0, HISTORY_KEEPER_ID, 'JOIN', chanName]);
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}
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chan.forEach(function (u) { sendMsg(ctx, user, [0, u.id, 'JOIN', chanName]); });
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chan.push(user);
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sendChannelMessage(ctx, chan, [user.id, 'JOIN', chanName]);
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return;
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}
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if (cmd === 'MSG') {
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if (obj === HISTORY_KEEPER_ID) {
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let parsed;
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try { parsed = JSON.parse(json[2]); } catch (err) { console.error(err); return; }
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if (parsed[0] === 'GET_HISTORY') {
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sendMsg(ctx, user, [seq, 'ACK']);
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getHistory(ctx, parsed[1], function (msg) {
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sendMsg(ctx, user, [0, HISTORY_KEEPER_ID, 'MSG', user.id, JSON.stringify(msg)]);
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}, function (messages) {
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// parsed[2] is a validation key if it exists
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if (messages.length === 0 && parsed[2] && !historyKeeperKeys[parsed[1]]) {
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var key = {channel: parsed[1], validateKey: parsed[2]};
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storeMessage(ctx, ctx.channels[parsed[1]], JSON.stringify(key));
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historyKeeperKeys[parsed[1]] = parsed[2];
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}
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let parsedMsg = {state: 1, channel: parsed[1]};
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sendMsg(ctx, user, [0, HISTORY_KEEPER_ID, 'MSG', user.id, JSON.stringify(parsedMsg)]);
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});
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}
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return;
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}
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if (obj && !ctx.channels[obj] && !ctx.users[obj]) {
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sendMsg(ctx, user, [seq, 'ERROR', 'ENOENT', obj]);
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return;
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}
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sendMsg(ctx, user, [seq, 'ACK']);
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let target;
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json.unshift(user.id);
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if ((target = ctx.channels[obj])) {
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sendChannelMessage(ctx, target, json);
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return;
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}
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if ((target = ctx.users[obj])) {
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json.unshift(0);
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sendMsg(ctx, target, json);
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return;
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}
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}
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if (cmd === 'LEAVE') {
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let err;
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let chan;
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let idx;
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if (!obj) { err = 'EINVAL'; obj = 'undefined';}
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if (!err && !(chan = ctx.channels[obj])) { err = 'ENOENT'; }
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if (!err && (idx = chan.indexOf(user)) === -1) { err = 'NOT_IN_CHAN'; }
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if (err) {
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sendMsg(ctx, user, [seq, 'ERROR', err, obj]);
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return;
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}
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sendMsg(ctx, user, [seq, 'ACK']);
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json.unshift(user.id);
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sendChannelMessage(ctx, chan, [user.id, 'LEAVE', chan.id]);
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chan.splice(idx, 1);
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}
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if (cmd === 'PING') {
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sendMsg(ctx, user, [seq, 'ACK']);
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return;
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}
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};
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let run = module.exports.run = function (storage, socketServer, config) {
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/* Channel removal timeout defaults to 60000ms (one minute) */
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config.channelRemovalTimeout =
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typeof(config.channelRemovalTimeout) === 'number'?
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config.channelRemovalTimeout:
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60000;
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let ctx = {
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users: {},
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channels: {},
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timeouts: {},
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store: storage,
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config: config
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};
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setInterval(function () {
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Object.keys(ctx.users).forEach(function (userId) {
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let u = ctx.users[userId];
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if (now() - u.timeOfLastMessage > LAG_MAX_BEFORE_DISCONNECT) {
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dropUser(ctx, u);
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} else if (!u.pingOutstanding && now() - u.timeOfLastMessage > LAG_MAX_BEFORE_PING) {
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sendMsg(ctx, u, [0, '', 'PING', now()]);
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u.pingOutstanding = true;
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}
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});
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}, 5000);
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socketServer.on('connection', function(socket) {
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if(socket.upgradeReq.url !== (config.websocketPath || '/cryptpad_websocket')) { return; }
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let conn = socket.upgradeReq.connection;
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let user = {
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addr: conn.remoteAddress + '|' + conn.remotePort,
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socket: socket,
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id: randName(),
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timeOfLastMessage: now(),
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pingOutstanding: false
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};
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ctx.users[user.id] = user;
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sendMsg(ctx, user, [0, '', 'IDENT', user.id]);
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socket.on('message', function(message) {
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if (ctx.config.logToStdout) { console.log('>'+message); }
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try {
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handleMessage(ctx, user, message);
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} catch (e) {
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console.log(e.stack);
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dropUser(ctx, user);
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}
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});
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socket.on('close', function (evt) {
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for (let userId in ctx.users) {
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if (ctx.users[userId].socket === socket) {
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dropUser(ctx, ctx.users[userId]);
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}
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}
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});
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});
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};
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}());
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