Add clientid/username/password to MQTT nodes

Alternative implementation, closes #42

The username/password as not stored in the main flow file for security reasons;
they are stored in the adjacent credentials file. This does mean an extra step
to importing an MQTT node, as the user has to manually edit it to re-add username
and password if needed.

nodes/core/io/10-mqtt.html

@@ -30,8 +30,9 @@
 </script>
 
 <script type="text/x-red" data-help-name="mqtt in">
-	<p>MQTT input node. Connects to the specified broker and subscribes to the specified topic. The topic may contain MQTT wildcards.</p>
+	<p>MQTT input node. Connects to a broker and subscribes to the specified topic. The topic may contain MQTT wildcards.</p>
-	<p>Outputs an object called <b>msg</b> containing <b>msg.topic, msg.payload, msg.qos</b> and <b>msg.retain</b>. <b>msg.payload</b> is a String.</p>
+	<p>Outputs an object called <b>msg</b> containing <b>msg.topic, msg.payload, msg.qos</b> and <b>msg.retain</b>.</p>
+	<p><b>msg.payload</b> is a String.</p>
 </script>
 
 <script type="text/javascript">
@@ -105,6 +106,18 @@
         <label for="node-config-input-port" style="margin-left: 10px; width: 35px; "> Port</label>
         <input type="text" id="node-config-input-port" placeholder="Port" style="width:45px">
     </div>
+    <div class="form-row">
+        <label for="node-config-input-clientid"><i class="icon-tag"></i> Client ID</label>
+        <input type="text" id="node-config-input-clientid" placeholder="Leave blank for auto generated">
+    </div>
+    <div class="form-row">
+        <label for="node-config-input-user"><i class="icon-user"></i> Username</label>
+        <input type="text" id="node-config-input-user">
+    </div>
+    <div class="form-row">
+        <label for="node-config-input-pass"><i class="icon-lock"></i> Password</label>
+        <input type="password" id="node-config-input-pass">
+    </div>
 </script>
 
 <script type="text/javascript">
@@ -112,10 +125,49 @@
         category: 'config',
         defaults: {
             broker: {value:"localhost",required:true},
-            port: {value:1883,required:true,validate:RED.validators.number()}
+            port: {value:1883,required:true,validate:RED.validators.number()},
+            clientid: { value:"" }
+            //user -> credentials
+            //pass -> credentials
+            
         },
         label: function() {
             return this.broker+":"+this.port;
+        },
+        oneditprepare: function() {
+            $.getJSON('mqtt-broker/'+this.id,function(data) {
+                if (data.user) {
+                    $('#node-config-input-user').val(data.user);
+                }
+                if (data.hasPassword) {
+                    $('#node-config-input-pass').val('__PWRD__');
+                } else {
+                    $('#node-config-input-pass').val('');
+                }
+                
+            });
+        },
+        oneditsave: function() {
+            var newUser = $('#node-config-input-user').val();
+            var newPass = $('#node-config-input-pass').val();
+            var credentials = {};
+            credentials.user = newUser;
+            if (newPass != '__PWRD__') {
+                credentials.password = newPass;
+            }
+            $.ajax({
+                url: 'mqtt-broker/'+this.id,
+                type: 'POST',
+                data: credentials,
+                success:function(result){}
+            });
+        },
+        ondelete: function() {
+            $.ajax({
+                url: 'mqtt-broker/'+this.id,
+                type: 'DELETE',
+                success: function(result) {}
+            });
         }
     });
 </script>

nodes/core/io/10-mqtt.js

@@ -22,9 +22,54 @@ function MQTTBrokerNode(n) {
     RED.nodes.createNode(this,n);
     this.broker = n.broker;
     this.port = n.port;
+    this.clientid = n.clientid;
+    var credentials = RED.nodes.getCredentials(n.id);
+    if (credentials) {
+        this.username = credentials.user;
+        this.password = credentials.password;
+    }  
 }
 RED.nodes.registerType("mqtt-broker",MQTTBrokerNode);
 
+var querystring = require('querystring');
+
+RED.app.get('/mqtt-broker/:id',function(req,res) {
+    var credentials = RED.nodes.getCredentials(req.params.id);
+    if (credentials) {
+        res.send(JSON.stringify({user:credentials.user,hasPassword:(credentials.password&&credentials.password!="")}));
+    } else {
+        res.send(JSON.stringify({}));
+    }
+});
+
+RED.app.delete('/mqtt-broker/:id',function(req,res) {
+    RED.nodes.deleteCredentials(req.params.id);
+    res.send(200);
+});
+
+RED.app.post('/mqtt-broker/:id',function(req,res) {
+    var body = "";
+    req.on('data', function(chunk) {
+        body+=chunk;
+    });
+    req.on('end', function(){
+        var newCreds = querystring.parse(body);
+        var credentials = RED.nodes.getCredentials(req.params.id)||{};
+        if (newCreds.user == null || newCreds.user == "") {
+            delete credentials.user;
+        } else {
+            credentials.user = newCreds.user;
+        }
+        if (newCreds.password == "") {
+            delete credentials.password;
+        } else {
+            credentials.password = newCreds.password||credentials.password;
+        }
+        RED.nodes.addCredentials(req.params.id,credentials);
+        res.send(200);
+    });
+});
+
 
 function MQTTInNode(n) {
     RED.nodes.createNode(this,n);
@@ -32,7 +77,7 @@ function MQTTInNode(n) {
     this.broker = n.broker;
     this.brokerConfig = RED.nodes.getNode(this.broker);
     if (this.brokerConfig) {
-        this.client = connectionPool.get(this.brokerConfig.broker,this.brokerConfig.port);
+        this.client = connectionPool.get(this.brokerConfig.broker,this.brokerConfig.port,this.brokerConfig.clientid,this.brokerConfig.username,this.brokerConfig.password);
         var node = this;
         this.client.subscribe(this.topic,2,function(topic,payload,qos,retain) {
                 var msg = {topic:topic,payload:payload,qos:qos,retain:retain};
@@ -65,7 +110,7 @@ function MQTTOutNode(n) {
     this.brokerConfig = RED.nodes.getNode(this.broker);
 
     if (this.brokerConfig) {
-        this.client = connectionPool.get(this.brokerConfig.broker,this.brokerConfig.port);
+        this.client = connectionPool.get(this.brokerConfig.broker,this.brokerConfig.port,this.brokerConfig.clientid,this.brokerConfig.username,this.brokerConfig.password);
         this.on("input",function(msg) {
             if (msg != null) {
                 if (this.topic) {

nodes/core/io/lib/mqttConnectionPool.js

@@ -25,13 +25,16 @@ function matchTopic(ts,t) {
 }
 
 module.exports = {
-    get: function(broker,port) {
+    get: function(broker,port,clientid,username,password) {
-        var id = broker+":"+port;
+        var id = "["+(username||"")+":"+(password||"")+"]["+(clientid||"")+"]@"+broker+":"+port;
         if (!connections[id]) {
             connections[id] = function() {
                 var client = mqtt.createClient(port,broker);
                 client.setMaxListeners(0);
-                var options = {keepalive:15,clientId:'mqtt_' + (1+Math.random()*4294967295).toString(16)};
+                var options = {keepalive:15};
+                options.clientId = clientid || 'mqtt_' + (1+Math.random()*4294967295).toString(16);
+                options.username = username;
+                options.password = password;
                 var queue = [];
                 var subscriptions = [];
                 var connecting = false;