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node-red/nodes/core/parsers/70-XML.js

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/**
* Copyright 2014 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 xml2js = require('xml2js');
var parseString = xml2js.parseString;
var builder = new xml2js.Builder({renderOpts:{pretty:false}});
function XMLNode(n) {
RED.nodes.createNode(this,n);
var node = this;
this.on("input", function(msg) {
if (msg.hasOwnProperty("payload")) {
if (typeof msg.payload == "object") {
try {
msg.payload = builder.buildObject(msg.payload);
node.send(msg);
}
catch(e) { node.log(e); }
}
else if (typeof msg.payload == "string") {
try {
parseString(msg.payload, {strict:true,async:true}, function (err, result) {
if (err) { node.error(err); }
else {
msg.payload = result;
node.send(msg);
}
});
}
catch(e) { node.log(e); }
}
else { node.log("This node only handles xml strings or js objects."); }
}
});
}
RED.nodes.registerType("xml",XMLNode);