Question

我在我的应用程序中创建了一个检测会话丢失的拦截器（服务器发送HTTP 419）。在这种情况下，我需要从服务器请求一个新会话，然后我想再次自动发送原始请求也许我可以在请求拦截器中保存请求，然后再次发送它，但可能有一个更简单的解决方案。

请注意，我必须使用特定的Web服务来创建会话。

angular.module('myapp', [ 'ngResource' ]).factory(
    'MyInterceptor', 
    function ($q, $rootScope) {
        return function (promise) {
            return promise.then(function (response) {
                // do something on success
                return response;
            }, function (response) {
                if(response.status == 419){
                    // session lost
                    // create new session server-side
                    // Session.query();
                    // then send current request again
                    // ???
                }
                return $q.reject(response);
            });
        };
    }).config(function ($httpProvider) {
        $httpProvider.responseInterceptors.push('MyInterceptor');
    });

Answer 1

这是我对那些感兴趣的人使用承诺的解决方案。基本上，您需要请求新会话，并在发送与原始请求相对应的新请求之前等待响应（使用response.config）。通过返回promise $ http（response.config），您可以确保将响应视为原始请求（语法可能不是最好的，因为我是承诺的新手）

angular.module('myapp', [ 'ngResource' ]).factory(
    'MyInterceptor', 
    function ($q, $rootScope) {
        return function (promise) {
            return promise.then(function (response) {
                // do something on success
                return response;
            }, function (response) {
                if(response.status == 419){
                    // session lost
                    var Session = $injector.get('Session');
                    var $http = $injector.get('$http');
                    // first create new session server-side
                    var defer = $q.defer();
                    var promiseSession = defer.promise; 
                    Session.query({},function(){
                        defer.resolve();
                    }, function(){
                       // error
                       defer.reject();
                    });       
                    // and chain request
                    var promiseUpdate = promiseSession.then(function(){
                        return $http(response.config);
                    });
                    return promiseUpdate;
                }
                return $q.reject(response);
            });
        };
    }).config(function ($httpProvider) {
        $httpProvider.responseInterceptors.push('MyInterceptor');
    });

Answer 2

responseError的{{1}}方法必须如下：

httpInterceptor

魔术发生在这里：

responseError: function (response) {
  // omit the retry if the request is made to a template or other url
  if (response.config.apiCal === true) {
    if (response.status === 419) {
      var deferred = $q.defer();
      // do something async: try to login.. rescue a token.. etc.
      asyncFuncionToRecoverFrom419(funcion(){
        // on success retry the http request
        retryHttpRequest(response.config, deferred);
      });
      return deferred.promise;
    } else {
      // a template file...
      return response;
    }
  }
}

Answer 3

您在正确的道路上，基本上将请求存储在队列中，并在重新建立会话后重试。

查看这个流行的模块：angular http auth（https://github.com/witoldsz/angular-http-auth）。在这个模块中，他们拦截了401个响应，但您可以通过这种方法对解决方案进行建模。

Answer 4

或多或少相同的解决方案，在typescript中翻译：

/// <reference path="../app.ts" />
/// <reference path="../../scripts/typings/angularjs/angular.d.ts" />

class AuthInterceptorService {

    static serviceId: string = "authInterceptorService";

    constructor(private $q: ng.IQService, private $location: ng.ILocationService, private $injector, private $log: ng.ILogService, private authStatusService) {}

    // Attenzione. Per qualche strano motivo qui va usata la sintassi lambda perché se no ts sbrocca il this.
    public request = (config: ng.IRequestConfig) => {

        config.headers = config.headers || {};

        var s: AuthStatus = this.authStatusService.status;
        if (s.isAuth) {
            config.headers.Authorization = 'Bearer ' + s.accessToken;
        }

        return config;
    }

    public responseError = (rejection: ng.IHttpPromiseCallbackArg<any>) => {

        if (rejection.status === 401) {

            var that = this;

            this.$log.warn("[AuthInterceptorService.responseError()]: not authorized request [401]. Now I try now to refresh the token.");

            var authService: AuthService = this.$injector.get("authService");
            var $http: ng.IHttpService = this.$injector.get("$http");

            var defer = this.$q.defer();
            var promise: ng.IPromise<any> = defer.promise.then(() => $http(rejection.config));

            authService
                .refreshAccessToken()
                    .then((response) => {

                        that.$log.info("[AuthInterceptorService.responseError()]: token refreshed succesfully. Now I resend the original request.");

                        defer.resolve();
                    },
                    (err) => {

                        that.$log.warn("[AuthInterceptorService.responseError()]: token refresh failed. I need to logout, sorry...");

                        this.authStatusService.clear();
                        this.$location.path('/login');
                    });

            return promise;
        }

        return this.$q.reject(rejection);
    }
}

// Update the app variable name to be that of your module variable
app.factory(AuthInterceptorService.serviceId,
    ["$q", "$location", "$injector", "$log", "authStatusService", ($q, $location, $injector, $log, authStatusService) => { 
        return new AuthInterceptorService($q, $location, $injector, $log, authStatusService)
    }]);

希望得到这个帮助。

如何在响应拦截器中再次发送请求？

4 个答案: