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node-red-nodes/parsers/base64/70-base64.js

51 lines
2.0 KiB
JavaScript

/**
* 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.
**/
module.exports = function(RED) {
"use strict";
function Base64Node(n) {
RED.nodes.createNode(this,n);
var node = this;
this.on("input", function(msg) {
if (msg.hasOwnProperty("payload")) {
if (Buffer.isBuffer(msg.payload)) {
// Take binary buffer and make into a base64 string
msg.payload = msg.payload.toString('base64');
node.send(msg);
}
else if (typeof msg.payload === "string") {
// Take base64 string and make into binary buffer
var regexp = new RegExp('^[A-Za-z0-9+\/=]*$');
if ( regexp.test(msg.payload) && (msg.payload.length % 4 === 0) ) {
msg.payload = new Buffer(msg.payload,'base64');
node.send(msg);
}
else {
node.log("Not a Base64 string - maybe we should encode it...");
msg.payload = (new Buffer(msg.payload,"binary")).toString('base64');
node.send(msg);
}
}
else {
node.warn("This node only handles strings or buffers.");
}
} else { node.warn("No payload found to process"); }
});
}
RED.nodes.registerType("base64",Base64Node);
}