wenwei1202/passport-wechat-enterprise

/**
 * Reconstructs the original URL of the request.
 *
 * This function builds a URL that corresponds the original URL requested by the
 * client, including the protocol (http or https) and host.
 *
 * If the request passed through any proxies that terminate SSL, the
 * `X-Forwarded-Proto` header is used to detect if the request was encrypted to
 * the proxy, assuming that the proxy has been flagged as trusted.
 *
 * @param {http.IncomingMessage} req
 * @param {Object} [options]
 * @return {String}
 * @api private
 */
exports.originalURL = function(req, options) {
  options = options || {}
  var app = req.app
  if (app && app.get && app.get('trust proxy')) {
    options.proxy = true
  }
  var trustProxy = options.proxy

  var proto = (req.headers['x-forwarded-proto'] || '').toLowerCase(),
    tls = req.connection.encrypted || (trustProxy && 'https' == proto.split(/\s*,\s*/)[0]),
    host = (trustProxy && req.headers['x-forwarded-host']) || req.headers.host,
    protocol = tls ? 'https' : 'http',
    path = req.url || ''
  return protocol + '://' + host + path
}