return None, result.wsgi_application

        #==============================================================

        # CHECK PERMISSIONS FOR THIS REQUEST USING GIVEN USERNAME

        #==============================================================

        try:

            user = User.get_by_username_or_email(username)

        except Exception:

            log.error(traceback.format_exc())

            return None, webob.exc.HTTPInternalServerError()

        authuser = AuthUser.make(dbuser=user, ip_addr=ip_addr)

        if authuser is None:

            return None, webob.exc.HTTPForbidden()

        if not self._check_permission(action, authuser, repo_name):

            return None, webob.exc.HTTPForbidden()

        return user, None

    def _handle_request(self, environ, start_response):

        raise NotImplementedError()

    def _check_permission(self, action, authuser, repo_name):

        """

        :param repo_name: repository name

        """

        if action == 'push':

            if not HasPermissionAnyMiddleware('repository.write',

                                              'repository.admin')(authuser,

                                                                  repo_name):

                return False

            #any other action need at least read permission

            if not HasPermissionAnyMiddleware('repository.read',

                                              'repository.write',

                                              'repository.admin')(authuser,

                                                                  repo_name):

                return False

        return True

    def _get_ip_addr(self, environ):

        return _get_ip_addr(environ)

    def __call__(self, environ, start_response):

        try:

            # try parsing a request for this VCS - if it fails, call the wrapped app

            parsed_request = self.parse_request(environ)

            if parsed_request is None:

                return self.application(environ, start_response)

            # skip passing error to error controller

            environ['pylons.status_code_redirect'] = True

            # quick check if repo exists...

            if not is_valid_repo(parsed_request.repo_name, self.basepath, self.scm_alias):

                raise webob.exc.HTTPNotFound()

            if parsed_request.action is None:

                # Note: the client doesn't get the helpful error message

                raise webob.exc.HTTPBadRequest('Unable to detect pull/push action for %r! Are you using a nonstandard command or client?' % parsed_request.repo_name)

            #======================================================================