/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (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.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla BrowserID.
 *
 * The Initial Developer of the Original Code is Mozilla.
 * Portions created by the Initial Developer are Copyright (C) 2011
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Lloyd Hilaiel <lloyd@hilaiel.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

// a teensy tinsy module to do parameter validation.  A good candiate for future
// librification.
//
// usage:
//
//   const validate = require('validate.js');
//
//   app.post('/wsapi/foo', validate([ "email", "site" ]), function(req, resp) {
//   });

const
logger = require('./logging.js').logger,
httputils = require('./httputils.js');

module.exports = function (params) {
  return function(req, resp, next) {
    var params_in_request=null;
    if (req.method === "POST") {
      params_in_request = req.body;
    } else {
      params_in_request = req.query;
    }

    try {
      params.forEach(function(k) {
        if (!params_in_request || !params_in_request.hasOwnProperty(k) || typeof params_in_request[k] !== 'string') {
          throw k;
        }
      });
      next();
    } catch(e) {
      logger.error(e.toString());
      return httputils.badRequest(resp, "missing '" + e + "' argument");
    }
  };
};