text: /**
   * Copyright 2015 IBM Corp. All Rights Reserved.
   *
   * 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.
   */
  
  'use strict';
  
  
  var logger = require('winston');
  
  
  var error  = function (status_code, message) {
    var e = new Error(message);
    e.code = status_code;
    e.message = message;
    return e;
  };
  
  function friendlyError(req, err) {
    var errorMapping = {
      '400' : 'error-400-minimum',
      '401' : 'error-401-credentials',
      '500' : 'error-500-enoughtweets'
    };
  
    var message = req.__(errorMapping[err.code]);
  
    return { code : err.code, error: message };
  }
  
  
  module.exports = function (app) {
  
    // catch 404 and forward to error handler
    app.use(function(_, __, next) { return next(error(404, 'error-404-notfound')); } );
  
    // error handler
    app.use(function (err, req, res, next) {
      var error = {
          code: err.code || 500,
          error: friendlyError(req,err) || err.error || err.message
        };
  
      if (error.code != 404)
        logger.error(err, 'url:', req.url, 'Error:', error);
  
      if (err.code === 'EBADCSRFTOKEN') {
        error = {
            code: 403,
            error: 'http://goo.gl/mGOksD'
          };
      }
  
      res.status(error.code)
        .json(error);
    });
  
  };
  