forked from node-red/node-red
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathcomms.js
More file actions
243 lines (219 loc) · 7.65 KB
/
Copy pathcomms.js
File metadata and controls
243 lines (219 loc) · 7.65 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
/**
* Copyright JS Foundation and other contributors, http://js.foundation
*
* 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");
var log = require("../../util").log; // TODO: separate module
var Tokens;
var Users;
var Permissions;
var server;
var settings;
var runtimeAPI;
var wsServer;
var activeConnections = [];
var anonymousUser;
var retained = {};
var heartbeatTimer;
var lastSentTime;
function init(_server,_settings,_runtimeAPI) {
server = _server;
settings = _settings;
runtimeAPI = _runtimeAPI;
Tokens = require("../auth/tokens");
Users = require("../auth/users");
Permissions = require("../auth/permissions");
}
function generateSession(length) {
var c = "ABCDEFGHIJKLMNOPQRSTUZWXYZabcdefghijklmnopqrstuvwxyz1234567890";
var token = [];
for (var i=0;i<length;i++) {
token.push(c[Math.floor(Math.random()*c.length)]);
}
return token.join("");
}
function CommsConnection(ws) {
this.session = generateSession(32);
this.ws = ws;
this.stack = [];
this.user = null;
this.lastSentTime = 0;
var self = this;
log.audit({event: "comms.open"});
log.trace("comms.open "+self.session);
var pendingAuth = (settings.adminAuth != null);
if (!pendingAuth) {
addActiveConnection(self);
}
ws.on('close',function() {
log.audit({event: "comms.close",user:self.user, session: self.session});
log.trace("comms.close "+self.session);
removeActiveConnection(self);
});
ws.on('message', function(data,flags) {
var msg = null;
try {
msg = JSON.parse(data);
} catch(err) {
log.trace("comms received malformed message : "+err.toString());
return;
}
if (!pendingAuth) {
if (msg.subscribe) {
self.subscribe(msg.subscribe);
// handleRemoteSubscription(ws,msg.subscribe);
}
} else {
var completeConnection = function(userScope,sendAck) {
try {
if (!userScope || !Permissions.hasPermission(userScope,"status.read")) {
ws.send(JSON.stringify({auth:"fail"}));
ws.close();
} else {
pendingAuth = false;
addActiveConnection(self);
if (sendAck) {
ws.send(JSON.stringify({auth:"ok"}));
}
}
} catch(err) {
console.log(err.stack);
// Just in case the socket closes before we attempt
// to send anything.
}
}
if (msg.auth) {
Tokens.get(msg.auth).then(function(client) {
if (client) {
Users.get(client.user).then(function(user) {
if (user) {
self.user = user;
log.audit({event: "comms.auth",user:self.user});
completeConnection(client.scope,true);
} else {
log.audit({event: "comms.auth.fail"});
completeConnection(null,false);
}
});
} else {
log.audit({event: "comms.auth.fail"});
completeConnection(null,false);
}
});
} else {
if (anonymousUser) {
log.audit({event: "comms.auth",user:anonymousUser});
self.user = anonymousUser;
completeConnection(anonymousUser.permissions,false);
//TODO: duplicated code - pull non-auth message handling out
if (msg.subscribe) {
self.subscribe(msg.subscribe);
}
} else {
log.audit({event: "comms.auth.fail"});
completeConnection(null,false);
}
}
}
});
ws.on('error', function(err) {
log.warn(log._("comms.error",{message:err.toString()}));
});
}
CommsConnection.prototype.send = function(topic,data) {
var self = this;
if (topic && data) {
this.stack.push({topic:topic,data:data});
}
if (!this._xmitTimer) {
this._xmitTimer = setTimeout(function() {
try {
self.ws.send(JSON.stringify(self.stack));
self.lastSentTime = Date.now();
} catch(err) {
removeActiveConnection(self);
log.warn(log._("comms.error-send",{message:err.toString()}));
}
delete self._xmitTimer;
self.stack = [];
},50);
}
}
CommsConnection.prototype.subscribe = function(topic) {
runtimeAPI.comms.subscribe({
user: this.user,
client: this,
topic: topic
})
}
function start() {
if (!settings.disableEditor) {
Users.default().then(function(_anonymousUser) {
anonymousUser = _anonymousUser;
var webSocketKeepAliveTime = settings.webSocketKeepAliveTime || 15000;
var path = settings.httpAdminRoot || "/";
path = (path.slice(0,1) != "/" ? "/":"") + path + (path.slice(-1) == "/" ? "":"/") + "comms";
wsServer = new ws.Server({
server:server,
path:path,
// Disable the deflate option due to this issue
// https://github.com/websockets/ws/pull/632
// that is fixed in the 1.x release of the ws module
// that we cannot currently pickup as it drops node 0.10 support
//perMessageDeflate: false
});
wsServer.on('connection',function(ws) {
var commsConnection = new CommsConnection(ws);
});
wsServer.on('error', function(err) {
log.warn(log._("comms.error-server",{message:err.toString()}));
});
lastSentTime = Date.now();
heartbeatTimer = setInterval(function() {
var now = Date.now();
if (now-lastSentTime > webSocketKeepAliveTime) {
activeConnections.forEach(connection => connection.send("hb",lastSentTime));
}
}, webSocketKeepAliveTime);
});
}
}
function stop() {
if (heartbeatTimer) {
clearInterval(heartbeatTimer);
heartbeatTimer = null;
}
if (wsServer) {
wsServer.close();
wsServer = null;
}
}
function addActiveConnection(connection) {
activeConnections.push(connection);
runtimeAPI.comms.addConnection({client: connection});
}
function removeActiveConnection(connection) {
for (var i=0;i<activeConnections.length;i++) {
if (activeConnections[i] === connection) {
activeConnections.splice(i,1);
runtimeAPI.comms.removeConnection({client:connection})
break;
}
}
}
module.exports = {
init:init,
start:start,
stop:stop
}