node-red/nodes/core/io/10-mqtt.js

/**
 * Copyright 2013 IBM Corp.
 *
 * 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 RED = require(process.env.NODE_RED_HOME+"/red/red");
var connectionPool = require("./lib/mqttConnectionPool");
var util = require("util");

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);
    this.topic = n.topic;
    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.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};
                if ((node.brokerConfig.broker == "localhost")||(node.brokerConfig.broker == "127.0.0.1")) {
                    msg._topic = topic;
                }
                node.send(msg);
        });
        this.client.connect();
    } else {
        this.error("missing broker configuration");
    }
}

RED.nodes.registerType("mqtt in",MQTTInNode);

MQTTInNode.prototype.close = function() {
    if (this.client) {
        this.client.disconnect();
    }
}


function MQTTOutNode(n) {
    RED.nodes.createNode(this,n);

    this.topic = n.topic;
    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.brokerConfig.clientid,this.brokerConfig.username,this.brokerConfig.password);
        this.on("input",function(msg) {
            if (msg != null) {
                if (this.topic) {
                    msg.topic = this.topic;
                }
                this.client.publish(msg);
            }
        });
        this.client.connect();
    } else {
        this.error("missing broker configuration");
    }
}

RED.nodes.registerType("mqtt out",MQTTOutNode);

MQTTOutNode.prototype.close = function() {
    if (this.client) {
        this.client.disconnect();
    }
}