6

我正在尝试实现对 401 响应的捕获，并尝试 在令牌刷新后根据 Angular 4 Interceptor retry requests获取刷新令牌。我试图实现同样的事情，但我永远无法重试该请求，而且我真的不确定这是否是应用刷新令牌策略的最佳方法。这是我的代码：

@Injectable()
export class AuthInterceptorService implements HttpInterceptor {
 public authService;
 refreshTokenInProgress = false;
 tokenRefreshedSource = new Subject();
 tokenRefreshed$ = this.tokenRefreshedSource.asObservable();
 constructor(private router: Router, private injector: Injector) { }
 authenticateRequest(req: HttpRequest<any>) {
 const token = this.authService.getToken();
 if (token != null) {
 return req.clone({
 headers: req.headers.set('Authorization', `Bearer ${token.access_token}`)
 });
 }
 else {
 return null;
 }
 }
 refreshToken() {
 if (this.refreshTokenInProgress) {
 return new Observable(observer => {
 this.tokenRefreshed$.subscribe(() => {
 observer.next();
 observer.complete();
 });
 });
 } else {
 this.refreshTokenInProgress = true;

 return this.authService.refreshToken()
 .do(() => {
 this.refreshTokenInProgress = false;
 this.tokenRefreshedSource.next();
 }).catch(
 (error) => {
 console.log(error);
 }
 );
 }
 }
 intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
 this.authService = this.injector.get(AuthenticationService);
 request = this.authenticateRequest(request);
 return next.handle(request).do((event: HttpEvent<any>) => {
 if (event instanceof HttpResponse) {
 // do stuff with response if you want
 }
 }, (err: any) => {
 if (err instanceof HttpErrorResponse) {
 if (err.status === 401) {
 return this.refreshToken()
 .switchMap(() => {
 request = this.authenticateRequest(request);
 console.log('*Repeating httpRequest*', request);
 return next.handle(request);
 })
 .catch(() => {
 return Observable.empty();
 });
 }
 }
 });
 }
}

问题是 SwitchMap 永远无法到达......

if (err.status === 401) {
 return this.refreshToken()
 .switchMap(() => {

还有 do 运算符...

return this.authService.refreshToken()
 .do(() => {

所以这把我带到了我的 authService refreshToken 方法......

refreshToken() {
 let refreshToken = this.getToken();

 refreshToken.grant_type = 'refresh_token';
 refreshToken.clientId = environment.appSettings.clientId;
 return this.apiHelper.httpPost(url, refreshToken, null)
 .map
 (
 response => {
 this.setToken(response.data, refreshToken.email);
 return this.getToken();
 }
 ).catch(error => {

 return Observable.throw('Please insert credentials');
 });
 }
 }

它返回一个映射的 observable，我知道如果我替换了 do in...

return this.authService.refreshToken()
 .do(() => {

订阅我会打破我猜的可观察链。我迷路了，我已经玩了很长时间没有解决方案。:D

4

1 回答 1

5

我很高兴你喜欢我的解决方案。我将把最终的解决方案放在这里，但如果有人想知道我休闲的过程，请到这里：Refresh Token OAuth Authentication Angular 4+

好的，首先我创建了一个 Service 来保存刷新令牌请求的状态，并且 Observable 可以知道请求何时完成。

这是我的服务：

@Injectable()
export class RefreshTokenService {
  public processing: boolean = false;
  public storage: Subject<any> = new Subject<any>();

  public publish(value: any) {
    this.storage.next(value);
  }
}

我注意到如果我有两个拦截器会更好，一个来刷新令牌并处理它，一个来放置授权标头（如果存在）。

这是刷新令牌的拦截器：

@Injectable()
  export class RefreshTokenInterceptor implements HttpInterceptor {

    constructor(private injector: Injector, private tokenService: RefreshTokenService) {
    }

    intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
      const auth = this.injector.get(OAuthService);
      if (!auth.hasAuthorization() && auth.hasAuthorizationRefresh() && !this.tokenService.processing && request.url !== AUTHORIZE_URL) {
        this.tokenService.processing = true;
        return auth.refreshToken().flatMap(
          (res: any) => {
            auth.saveTokens(res);
            this.tokenService.publish(res);
            this.tokenService.processing = false;
            return next.handle(request);
          }
        ).catch(() => {
          this.tokenService.publish({});
          this.tokenService.processing = false;
          return next.handle(request);
        });
      } else if (request.url === AUTHORIZE_URL) {
        return next.handle(request);
      }

      if (this.tokenService.processing) {
        return this.tokenService.storage.flatMap(
          () => {
            return next.handle(request);
          }
        );
      } else {
        return next.handle(request);
      }
    }
  }

所以在这里我等待刷新令牌可用或失败，然后我释放需要授权标头的请求。

这是放置授权标头的拦截器：

@Injectable()
  export class TokenInterceptor implements HttpInterceptor {
    constructor(private injector: Injector) {}

    intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
      const auth = this.injector.get(OAuthService);
      let req = request;
      if (auth.hasAuthorization()) {
        req = request.clone({
          headers: request.headers.set('Authorization', auth.getHeaderAuthorization())
        });
      }

      return next.handle(req).do(
        () => {},
        (error: any) => {
          if (error instanceof HttpErrorResponse) {
            if (error.status === 401) {
              auth.logOut();
            }
          }
        });
    }
  }

我的主要模块是这样的：

@NgModule({
  imports: [
    ...,
    HttpClientModule
  ],
  declarations: [
    ...
  ],
  providers: [
    ...
    OAuthService,
    AuthService,
    RefreshTokenService,
    {
      provide: HTTP_INTERCEPTORS,
      useClass: RefreshTokenInterceptor,
      multi: true
    },
    {
      provide: HTTP_INTERCEPTORS,
      useClass: TokenInterceptor,
      multi: true
    }
  ],
  bootstrap: [AppComponent]
})
export class AppModule {
}

欢迎任何反馈，如果我做错了什么，请告诉我。我正在使用Angular 4.4.6进行测试，但我不知道它是否适用于 Angular 5，我认为应该可以。

于 2017-12-17T22:13:10.503 回答