扩展 HTTP - returns 未授权时重定向

Question

当我收到 401 http 状态时，我正在尝试重定向到登录页面。拳头尝试是：

public getPatients(extraHttpRequestParams?: any): Observable<Array<models.Patient>> {
const path = this.basePath + '/api/patient';

let queryParameters = new URLSearchParams();
let headerParams = this.defaultHeaders;
let requestOptions: RequestOptionsArgs = {
    method: 'GET',
    headers: headerParams,
    search: queryParameters
};

return this.httpInterceptor.request(path, requestOptions)
    .map((response: Response) => {
        if (response.status === 204) {
            return undefined;
        } else {
            if (response.status === 401) {
                this.router.navigate(['/login']);
            }
            return response.json();
        }
    });

}

但是当我得到401时，我没有进入地图功能，它在浏览器中给出了未经授权的错误。

所以阅读一些帖子，有一种方法可以扩展 http 服务，似乎是正确的方法，但是当我尝试在 app.module.ts 上实例化 http 依赖项时遇到了一些问题。在我的例子中，我只需要重写拦截器方法，但如果其他人需要其他部分，我会把所有代码都放上去。

这是我的 http 扩展：

import { Http, Request, RequestOptionsArgs, Response, XHRBackend, RequestOptions, ConnectionBackend, Headers} from '@angular/http';
import { Router } from '@angular/router';
import { LocationStrategy, HashLocationStrategy} from '@angular/common';
import { Observable } from 'rxjs/Observable';
import {Injectable} from '@angular/core';

@Injectable()
export class HttpInterceptor extends Http {

    constructor(backend: ConnectionBackend, defaultOptions: RequestOptions, private _router: Router) {
        super(backend, defaultOptions);
    };

    request(url: string | Request, options?: RequestOptionsArgs): Observable<Response> {
        return this.intercept(super.request(url, options));
    };

    get(url: string, options?: RequestOptionsArgs): Observable<Response> {
        return this.intercept(super.get(url, options));
    };

    post(url: string, body: string, options?: RequestOptionsArgs): Observable<Response> {
        return this.intercept(super.post(url, body, this.getRequestOptionArgs(options)));
    };

    put(url: string, body: string, options?: RequestOptionsArgs): Observable<Response> {
        return this.intercept(super.put(url, body, this.getRequestOptionArgs(options)));
    };

    delete(url: string, options?: RequestOptionsArgs): Observable<Response> {
        return this.intercept(super.delete(url, options));
    };

    getRequestOptionArgs(options?: RequestOptionsArgs): RequestOptionsArgs {
        if (options == null) {
            options = new RequestOptions();
        }
        if (options.headers == null) {
            options.headers = new Headers();
        }
        options.headers.append('Content-Type', 'application/json');
        return options;
    };

    intercept(observable: Observable<Response>): Observable<Response> {
        return observable.catch((err, source) => {
            if (err.status == 401) {
                this._router.navigate(['/login']);
                return Observable.empty();
            } else {
                return Observable.throw(err);
            }
        });

    }
};

在我的 app.module.ts 中，我必须添加：

import { NgModule } from '@angular/core';
import { BrowserModule }  from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { routing, appRoutingProviders } from './app.routing';
import { FormsModule }    from '@angular/forms';
import { Routes, RouterModule }   from '@angular/router';
import { HomeComponent } from './home/home.component';
import { PatientsComponent } from './pacientes/pacientes.component';
import { HttpInterceptor }  from '../api/api/HttpInterceptor';
import { RequestOptions, ConnectionBackend} from '@angular/http';
import { HttpModule, JsonpModule } from '@angular/http';
const routes: Routes = [

];

@NgModule({
  imports: [
    BrowserModule,
    FormsModule,
    HttpModule,
    JsonpModule,
    routing,
    RouterModule.forRoot(routes, { useHash: true }),  // .../#/crisis-center/
  ],
  declarations: [
    AppComponent,
    PatientsComponent,
  ],
  providers: [
    appRoutingProviders,
    HttpInterceptor,
    RequestOptions 
  ],
  bootstrap: [AppComponent]
})
export class AppModule { }

现在一切都很好，但是当我尝试使用我创建的新 httpInterceptor 服务，将其导入并将其添加到构造函数并为我的新 http 拦截器实例替换 http 实例时，我得到了 ConnectionBackend 的 No provider，我尝试将 ConnectionBackend 添加到提供程序，但它显示 'types of property providers are incompatible'。然后我尝试添加 httpInterceptor 但我收到未捕获错误：无法解析 RequestOptions 的所有参数：(?).

所以总而言之，必须有一种方法可以正确扩展 http 方法或以其他方式处理 401.. 我该怎么做，是否有一些教程，link 或可以看一看的东西？

Answer 1

没有使用令牌 ConnectionBackend 注册的提供商。你可以做的是在配置拦截器时使用工厂

providers:    [
  { 
    provide: HttpInterceptor,
    useFactory: (backend: XHRBackend, options: RequestOptions, router: Router) => {
      return new HttpInterceptor(backend, options, router);
    },
    deps: [XHRBackend, RequestOptions, Router ]
  }
]

我已经用您的代码对此进行了测试，它应该可以工作。

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