jssip/lib-es5/RequestSender.js

the Javascript SIP library

"use strict";

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }

function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }

var Logger = require('./Logger');

var JsSIP_C = require('./Constants');

var DigestAuthentication = require('./DigestAuthentication');

var Transactions = require('./Transactions');

var logger = new Logger('RequestSender'); // Default event handlers.

var EventHandlers = {
  onRequestTimeout: function onRequestTimeout() {},
  onTransportError: function onTransportError() {},
  onReceiveResponse: function onReceiveResponse() {},
  onAuthenticated: function onAuthenticated() {}
};

module.exports = /*#__PURE__*/function () {
  function RequestSender(ua, request, eventHandlers) {
    _classCallCheck(this, RequestSender);

    this._ua = ua;
    this._eventHandlers = eventHandlers;
    this._method = request.method;
    this._request = request;
    this._auth = null;
    this._challenged = false;
    this._staled = false; // Define the undefined handlers.

    for (var handler in EventHandlers) {
      if (Object.prototype.hasOwnProperty.call(EventHandlers, handler)) {
        if (!this._eventHandlers[handler]) {
          this._eventHandlers[handler] = EventHandlers[handler];
        }
      }
    } // If ua is in closing process or even closed just allow sending Bye and ACK.


    if (ua.status === ua.C.STATUS_USER_CLOSED && (this._method !== JsSIP_C.BYE || this._method !== JsSIP_C.ACK)) {
      this._eventHandlers.onTransportError();
    }
  }
  /**
  * Create the client transaction and send the message.
  */


  _createClass(RequestSender, [{
    key: "send",
    value: function send() {
      var _this = this;

      var eventHandlers = {
        onRequestTimeout: function onRequestTimeout() {
          _this._eventHandlers.onRequestTimeout();
        },
        onTransportError: function onTransportError() {
          _this._eventHandlers.onTransportError();
        },
        onReceiveResponse: function onReceiveResponse(response) {
          _this._receiveResponse(response);
        }
      };

      switch (this._method) {
        case 'INVITE':
          this.clientTransaction = new Transactions.InviteClientTransaction(this._ua, this._ua.transport, this._request, eventHandlers);
          break;

        case 'ACK':
          this.clientTransaction = new Transactions.AckClientTransaction(this._ua, this._ua.transport, this._request, eventHandlers);
          break;

        default:
          this.clientTransaction = new Transactions.NonInviteClientTransaction(this._ua, this._ua.transport, this._request, eventHandlers);
      } // If authorization JWT is present, use it.


      if (this._ua._configuration.authorization_jwt) {
        this._request.setHeader('Authorization', this._ua._configuration.authorization_jwt);
      }

      this.clientTransaction.send();
    }
    /**
    * Called from client transaction when receiving a correct response to the request.
    * Authenticate request if needed or pass the response back to the applicant.
    */

  }, {
    key: "_receiveResponse",
    value: function _receiveResponse(response) {
      var challenge;
      var authorization_header_name;
      var status_code = response.status_code;
      /*
      * Authentication
      * Authenticate once. _challenged_ flag used to avoid infinite authentications.
      */

      if ((status_code === 401 || status_code === 407) && (this._ua.configuration.password !== null || this._ua.configuration.ha1 !== null)) {
        // Get and parse the appropriate WWW-Authenticate or Proxy-Authenticate header.
        if (response.status_code === 401) {
          challenge = response.parseHeader('www-authenticate');
          authorization_header_name = 'authorization';
        } else {
          challenge = response.parseHeader('proxy-authenticate');
          authorization_header_name = 'proxy-authorization';
        } // Verify it seems a valid challenge.


        if (!challenge) {
          logger.debug("".concat(response.status_code, " with wrong or missing challenge, cannot authenticate"));

          this._eventHandlers.onReceiveResponse(response);

          return;
        }

        if (!this._challenged || !this._staled && challenge.stale === true) {
          if (!this._auth) {
            this._auth = new DigestAuthentication({
              username: this._ua.configuration.authorization_user,
              password: this._ua.configuration.password,
              realm: this._ua.configuration.realm,
              ha1: this._ua.configuration.ha1
            });
          } // Verify that the challenge is really valid.


          if (!this._auth.authenticate(this._request, challenge)) {
            this._eventHandlers.onReceiveResponse(response);

            return;
          }

          this._challenged = true; // Update ha1 and realm in the UA.

          this._ua.set('realm', this._auth.get('realm'));

          this._ua.set('ha1', this._auth.get('ha1'));

          if (challenge.stale) {
            this._staled = true;
          }

          this._request = this._request.clone();
          this._request.cseq += 1;

          this._request.setHeader('cseq', "".concat(this._request.cseq, " ").concat(this._method));

          this._request.setHeader(authorization_header_name, this._auth.toString());

          this._eventHandlers.onAuthenticated(this._request);

          this.send();
        } else {
          this._eventHandlers.onReceiveResponse(response);
        }
      } else {
        this._eventHandlers.onReceiveResponse(response);
      }
    }
  }]);

  return RequestSender;
}();