我是Angular2的新手,尝试捕获401错误以进行令牌刷新,并计划重试原始请求…
这是我的authService.refresh方法：
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);
}
);
});
}
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));
}
);
}
除了Günter的答案,我还会利用flatMap回调参数中的accessToken而不是使用服务属性：
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);
}
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