we-core/src/Router/responseType.js

We.js is a node.js framework for build real time applications, sites or blogs!

const mime = require('mime');

/**
 * Parse response type middleware
 *
 * @param  {Object}   req  express.js request
 * @param  {Object}   res  express.js response
 * @param  {Function} next callback
 */
module.exports = function responseType (req, res, next){

  if (!req.headers) req.headers = {};

  parseResponseType(req);

  next();
};

/**
 * Parse the response type
 *
 * with order: 1. extension, 2.responseType, 3.Accept header
 *
 * @param  {Object} req express.js request
 * @return {String}     the response type string
 */
function parseResponseType (req) {
  if (req.query && req.query.responseType) {
    if (req.query.responseType == 'modal') {
      // suport for old we.js contentOnly api
      req.query.responseType = req.we.config.defaultResponseType;
      req.query.contentOnly = true;
    }

    req.headers.accept = mime.getType(req.query.responseType.toLowerCase());
  }

  if (req.accepts(req.we.config.responseTypes))
    return;

  req.headers.accept = req.we.config.defaultResponseType;
}