将http拦截器编写为类

Question

我在用普通的 TypeScript 编写有角度的 http 拦截器时遇到了麻烦。我要转换的代码如下：

.config(['$httpProvider', function ($httpProvider) {

    var interceptor = ['$rootScope', '$q', 'httpBuffer', function ($rootScope, $q, httpBuffer) {
        function success(response) {
            return response;
        }

        function error(response) {
            if (response.status === 401 && !response.config.ignoreAuthModule) {
                var deferred = $q.defer();
                httpBuffer.append(response.config, deferred);
                $rootScope.$broadcast('event:auth-loginRequired', response);
                return deferred.promise;
            }
            // otherwise, default behaviour
            return $q.reject(response);
        }

        return function (promise) {
            return promise.then(success, error);
        };

    }];
    $httpProvider.responseInterceptors.push(interceptor);
}])

第一部分很清楚，编写一个带有构造函数的类，该构造函数接受三个依赖项$rootScope、$q 和httpBuffer。还要写两个私有方法success和response。

class MyInterceptorClass {
    constructor(private $rootScope: ng.IRootScopeService, private $q: ng.IQService, private httpBuffer: HttpBuffer) {
    }

    private success(response: ng.IHttpPromiseCallbackArg<any>): ng.IHttpPromiseCallbackArg<any> {
        return response;
    }

    private error(response: ng.IHttpPromiseCallbackArg<any>): ng.IHttpPromiseCallbackArg<any> {
        if (response.status == 401 && !((<any>response.config).ignoreAuthModule)) {
            var deferred = this.$q.defer();
            this.httpBuffer.append(response.config, deferred);
            this.$rootScope.$broadcast('event:auth-loginRequired', response);

            return deferred.promise;
        }

        // Otherwise, default behavior
        return this.$q.reject(response);
    }
}

拦截器的注册也要明确：

.config(['$httpProvider', ($httpProvider: ng.IHttpProvider)=> {
    $httpProvider.responseInterceptors.push(['$rootScope', '$q', 'httpBuffer', MyInterceptorClass]);
}]);

我遇到的问题是原始 JavaScript 的最后一部分，即匿名函数的返回值。我将如何在 TypeScript 中创建它？据我了解，这将是 TypeScript 中的无名方法，但这是不可能的。

Answer 1

配置设置如下

    .config(['$httpProvider', function ($httpProvider: ng.IHttpProvider) {
        $httpProvider.interceptors.push(AuthenticationInterceptor.Factory);
    }])

你的实际课程应该如下所示

module Common.Security {
'use strict';

export class AuthenticationInterceptor {

    public static Factory($q: ng.IQService) {
        return new AuthenticationInterceptor($q);
    }

    constructor(private $q: ng.IQService) {
    }

    //Method name should be exactly "response" - http://docs.angularjs.org/api/ng/service/$http
    public response(response) {
        console.log(response);
        return response || this.$q.when(response);
    }

    public responseError(rejection) {
        console.log(rejection.status);
        if (rejection.status === 401) {
        }
        // Otherwise, default behavior
        return this.$q.reject(rejection);
    }
}

Answer 2

这就是我将 httpinterceptor 编写为一个类的方式

module services {

export class ErrorHttpInterceptor {
    public $log:ng.ILogService;
    public $injector:ng.auto.IInjectorService;

    public responseError = (_rejection)=>{
       //handle error here
    };
    public request = (config)=>{
        config.withCredentials = true;
        return config;
    };
    public requestError = (rejection)=>{
        var $q:ng.IQService = this.$injector.get("$q");
        this.$log.log("requestError", rejection);
        return $q.reject(rejection);
    };
    static $inject = ['$injector', '$rootScope', '$q', '$window'];
    constructor($injector:ng.auto.IInjectorService, public $rootScope, public $q, public $window){
        this.$log = $injector.get('$log');
        this.$injector = $injector;
    }
  }
}

注册

 var app =angular.module('foo',[]);
 app.config(['$httpProvider', (_$httpProvider:ng.IHttpProvider)=>{
    _$httpProvider.interceptors.push('ErrorHttpInterceptor');

}]);

Answer 3

你需要做： 公众响应 = (response) => {}

public responseError = (rejection) => { }

因为以其他方式，您的“this”将是未定义的。 要了解您为什么需要这个：https://www.youtube.com/watch?v=tvocUcbCupA&hd=1

Answer 4

配置设置如下

    .config(['$httpProvider', function ($httpProvider: ng.IHttpProvider) {
        $httpProvider.interceptors.push(AuthenticationInterceptor.Factory);
    }])

你的实际课程应该如下所示

module Common {
'use strict';

export class AuthenticationInterceptor {

    private static _instance: AuthenticationInterceptor;

    public static Factory($q: ng.IQService) {
        AuthenticationInterceptor._instance = new AuthenticationInterceptor($q);

        return AuthenticationInterceptor._instance;
    }

    constructor(private $q: ng.IQService) {
    }

    //Method name should be exactly "response" - http://docs.angularjs.org/api/ng/service/$http
    public response(response) {
        var self = Common.AuthenticationInterceptor._instance;

        console.log(response);
        return response || self.$q.when(response);
    }

    public responseError(rejection) {
        var self = Common.AuthenticationInterceptor._instance;

        console.log(rejection.status);
        if (rejection.status === 401) {
        }

        // Otherwise, default behavior
        return self.$q.reject(rejection);
    }
}

有必要获取具有完整命名空间的类的实例，因为当接收来自 Angular 的回调时，'this' 是未定义的。

Answer 5

按名称注册：$httpProvider.interceptors.push('myInterceptorClass');

然后确保您的课程也注册为服务：

yourApp.service('myInterceptorClass',MyInterceptorClass)