Angular2:捕获401错误以刷新令牌 | 捕获401错误以刷新令牌

本文介绍了Angular2:捕获401错误以刷新令牌的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我是Angular2的新手，并尝试捕获401错误以进行令牌刷新，并计划重试原始请求...

I'm new to Angular2 and trying catch 401 error for token refresh with the plan to retry original request...

这是我的authService.refresh方法:

Here is my authService.refresh method:

refresh() : Observable<any> {
    console.log("refreshing token");
    this.accessToken = null;
    let params : string = 'refresh_token=' + this.refreshToken + '&grant_type=refresh_token';
    let headers = new Headers();
    headers.append('Authorization', 'Basic ' + this.clientCredentials);
    headers.append('Content-Type', 'application/x-www-form-urlencoded');

    return Observable.create(
        observer => {
            this._http.post('http://localhost:8080/oauth/token', params, {
                    headers : headers
            })
            .map(res => res.json()).subscribe(
                (data) => {
                    this.accessToken = data.access_token;
                    observer.next(this.accessToken);
                    observer.complete();
                },
                (error) => {
                    Observable.throw(error);
                }
            );
        });
 }

然后我尝试在组件方法中使用刷新功能:

and then I try to use refresh functionality in my component method:

update(index : number) {
 let headers = new Headers();
 headers.append('Authorization', 'Bearer ' + this._authService.accessToken);
 this._http.get('http://localhost:8080/rest/resource', {
    headers : headers
 })
 .catch(initialError =>{
    if (initialError && initialError.status === 401) {
       this._authService.refresh().flatMap((data) => {
         if ( this._authService.accessToken != null) {
             // retry with new token
             headers = new Headers();
             headers.append('Authorization', 'Bearer ' +  this._authService.accessToken);
             return this._http.get('http://localhost:8080/rest/resource', { headers : headers });
         } else {
         return Observable.throw(initialError);
         }
       });
    } else {
      return Observable.throw(initialError);
    }
 })
 .map(res => res.json())
 .subscribe(
    data => {
      this.resources[index] = data;
    },
    error => {
      console.log("error="+JSON.stringify(error));
    }
 );
}

由于某些原因，此方法不起作用...我想知道在angular2中令牌刷新功能的正确实现是什么?enter code here

This doesn't work for some reason...I wonder what is the correct implementation of token refresh functionality in angular2?enter code here

推荐答案

除了Günter的回答，我将利用flatMap回调参数中的accessToken而不是使用service属性:

In addition to the Günter's answer, I would leverage the accessToken from the flatMap callback parameter instead of using a service property:

if (initialError && initialError.status === 401) {
   this._authService.refresh().flatMap((accessToken) => {
     // retry with new token
     headers = new Headers();
     headers.append('Authorization', 'Bearer ' +  accessToken);
     return this._http.get('http://localhost:8080/rest/resource', {
       headers : headers });
   });
} else {
  return Observable.throw(initialError);
}

本文可能会让您感兴趣(处理安全性"部分):

This article could interest you (section "Handling security"):

http://restlet.com/blog/2016/04/18/interacting-ficiently-with-a-restful-service-with-angular2-and-rxjs-part-3/

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