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

61 lines
2.4 KiB
JavaScript

/**
* 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.
**/
module.exports = function(RED) {
"use strict";
function JSONNode(n) {
RED.nodes.createNode(this,n);
this.indent = n.pretty ? 4 : 0;
this.action = n.action||"";
this.property = n.property||"payload";
var node = this;
this.on("input", function(msg) {
var value = RED.util.getMessageProperty(msg,node.property);
if (value !== undefined) {
if (typeof value === "string") {
if (node.action === "" || node.action === "obj") {
try {
RED.util.setMessageProperty(msg,node.property,JSON.parse(value));
node.send(msg);
}
catch(e) { node.error(e.message,msg); }
} else {
node.send(msg);
}
}
else if (typeof value === "object") {
if (node.action === "" || node.action === "str") {
if (!Buffer.isBuffer(value)) {
try {
RED.util.setMessageProperty(msg,node.property,JSON.stringify(value,null,node.indent));
node.send(msg);
}
catch(e) { node.error(RED._("json.errors.dropped-error")); }
}
else { node.warn(RED._("json.errors.dropped-object")); }
} else {
node.send(msg);
}
}
else { node.warn(RED._("json.errors.dropped")); }
}
else { node.send(msg); } // If no property - just pass it on.
});
}
RED.nodes.registerType("json",JSONNode);
}