Responding using Hawk

hawkRespond.js

/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */

module.exports = function() {
  var Hawk = require( "hawk" );

  return {
    Hawk: Hawk,
    /*
     * Code: the HTTP status code to use
     * res: the response object generated by express
     * creds: the credentials object to be used when calculating the MAC with Hawk
     * artifacts: the parsed information from the original Authorization header,
     *            used by Hawk when generating the MAC for the response
     * payload: the data to be sent with the response
     * contentType: the contentType of the payload
     */
    respond: function( code, res, creds, artifacts, payload, contentType ) {

      // Set up the response headers, including contentType
      var headers = { "Content-Type": contentType },
          // Generate the content for the Server-Authorization header
          header = Hawk.server.header( creds, artifacts, { payload: payload, contentType: contentType } );

      headers[ "Server-Authorization" ] = header;

      // Write the headers and payload to the response, send to the client
      res.writeHead( code, headers );
      res.end( payload );
    }
  };
};