@webgap/token/lib/rs256.js

WebGAP Tokenizer module. Handles JWT encoding / decoding features.

/**
 * (C) Copyright 2014 WebGAP (http://www.webgap.eu/).
 *
 * 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.
 *
 * Created by: ManuelMartins
 * Created on: 23-05-2014
 *
 */

"use strict";

var AbstractAlgorithm = require('./abstract.js');
var fs = require('fs');
var util = require('util');

/**
 * RS256 Algorithm implementation
 *
 * @param {Object} options
 * @param {string} options.privateKeyPath
 * @param {string} options.publicKeyPath
 * @constructor
 */
function RS256Algorithm(options) {
  RS256Algorithm.super_.apply(this, arguments);

  var self = this;
  options = options || {};
  // algorithm
  self.ALGORITHM = 'RS256';
  // load certificates
  if (!options.privateKeyPath || !options.publicKeyPath) {
    console.error('Parameter \'options.privateKeyPath\' or \'options.publicKeyPath\' are missing.');
    throw new Error('Parameter \'options.privateKeyPath\' or \'options.publicKeyPath\' are missing.');
  }
  self.pem = fs.readFileSync(options.privateKeyPath).toString('ascii');
  self.cert = fs.readFileSync(options.publicKeyPath).toString('ascii');
}

/* inherit AbstractAlgorithm Module */
util.inherits(RS256Algorithm, AbstractAlgorithm);

/**
 * {@inheritDoc}
 */
RS256Algorithm.prototype.encode = function (data) {
  return this.jwt.encode(this.generateJWTObject(data), this.pem, this.ALGORITHM);
};

/**
 * {@inheritDoc}
 */
RS256Algorithm.prototype.decode = function (token, complete) {
  var decodedToken = null;
  try {
    decodedToken = this.jwt.decode(token, this.cert);
    if (!complete) {
      decodedToken = decodedToken.data;
    }
  } catch (error) {
    console.warn("Could not decode token! " + error);
    decodedToken = false;
  }
  return decodedToken;
};

module.exports = RS256Algorithm;