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node-red/red/comms.js

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/**
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* Copyright 2014, 2015 IBM Corp.
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*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
**/
var ws = require("ws");
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var log = require("./log");
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var server;
var settings;
var wsServer;
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var pendingConnections = [];
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var activeConnections = [];
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var retained = {};
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var heartbeatTimer;
var lastSentTime;
function init(_server,_settings) {
server = _server;
settings = _settings;
}
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function start() {
var Tokens = require("./api/auth/tokens");
var Users = require("./api/auth/users");
var Permissions = require("./api/auth/permissions");
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if (!settings.disableEditor) {
Users.default().then(function(anonymousUser) {
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var webSocketKeepAliveTime = settings.webSocketKeepAliveTime || 15000;
var path = settings.httpAdminRoot || "/";
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path = (path.slice(0,1) != "/" ? "/":"") + path + (path.slice(-1) == "/" ? "":"/") + "comms";
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wsServer = new ws.Server({server:server,path:path});
wsServer.on('connection',function(ws) {
log.audit({event: "comms.open"});
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var pendingAuth = (settings.adminAuth != null);
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if (!pendingAuth) {
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activeConnections.push(ws);
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} else {
pendingConnections.push(ws);
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}
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ws.on('close',function() {
log.audit({event: "comms.close",user:ws.user});
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removeActiveConnection(ws);
removePendingConnection(ws);
});
ws.on('message', function(data,flags) {
var msg = null;
try {
msg = JSON.parse(data);
} catch(err) {
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log.trace("comms received malformed message : "+err.toString());
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return;
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}
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if (!pendingAuth) {
if (msg.subscribe) {
handleRemoteSubscription(ws,msg.subscribe);
}
} else {
var completeConnection = function(userScope,sendAck) {
if (!userScope || !Permissions.hasPermission(userScope,"status.read")) {
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ws.close();
} else {
pendingAuth = false;
removePendingConnection(ws);
activeConnections.push(ws);
if (sendAck) {
ws.send(JSON.stringify({auth:"ok"}));
}
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}
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}
if (msg.auth) {
Tokens.get(msg.auth).then(function(client) {
if (client) {
Users.get(client.user).then(function(user) {
if (user) {
ws.user = user;
log.audit({event: "comms.auth",user:ws.user});
completeConnection(client.scope,true);
} else {
log.audit({event: "comms.auth.fail"});
completeConnection(null,false);
}
});
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} else {
log.audit({event: "comms.auth.fail"});
completeConnection(null,false);
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}
});
} else {
if (anonymousUser) {
log.audit({event: "comms.auth",user:anonymousUser});
completeConnection(anonymousUser.permissions,false);
} else {
log.audit({event: "comms.auth.fail"});
completeConnection(null,false);
}
//TODO: duplicated code - pull non-auth message handling out
if (msg.subscribe) {
handleRemoteSubscription(ws,msg.subscribe);
}
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}
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}
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});
ws.on('error', function(err) {
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log.warn(log._("comms.error",{message:err.toString()}));
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});
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});
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wsServer.on('error', function(err) {
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log.warn(log._("comms.error-server",{message:err.toString()}));
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});
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lastSentTime = Date.now();
heartbeatTimer = setInterval(function() {
var now = Date.now();
if (now-lastSentTime > webSocketKeepAliveTime) {
publish("hb",lastSentTime);
}
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}, webSocketKeepAliveTime);
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});
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}
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}
function stop() {
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if (heartbeatTimer) {
clearInterval(heartbeatTimer);
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heartbeatTimer = null;
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}
if (wsServer) {
wsServer.close();
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wsServer = null;
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}
}
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function publish(topic,data,retain) {
if (retain) {
retained[topic] = data;
} else {
delete retained[topic];
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}
lastSentTime = Date.now();
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activeConnections.forEach(function(conn) {
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publishTo(conn,topic,data);
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});
}
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function publishTo(ws,topic,data) {
var msg = JSON.stringify({topic:topic,data:data});
try {
ws.send(msg);
} catch(err) {
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log.warn(log._("comms.error-send",{message:err.toString()}));
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}
}
function handleRemoteSubscription(ws,topic) {
var re = new RegExp("^"+topic.replace(/([\[\]\?\(\)\\\\$\^\*\.|])/g,"\\$1").replace(/\+/g,"[^/]+").replace(/\/#$/,"(\/.*)?")+"$");
for (var t in retained) {
if (re.test(t)) {
publishTo(ws,t,retained[t]);
}
}
}
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function removeActiveConnection(ws) {
for (var i=0;i<activeConnections.length;i++) {
if (activeConnections[i] === ws) {
activeConnections.splice(i,1);
break;
}
}
}
function removePendingConnection(ws) {
for (var i=0;i<pendingConnections.length;i++) {
if (pendingConnections[i] === ws) {
pendingConnections.splice(i,1);
break;
}
}
}
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module.exports = {
init:init,
start:start,
stop:stop,
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publish:publish,
}