Angular HTTP client implementation with retry logic using alternative access token

Question

Angular HTTP client implementation with retry logic using alternative access token

Dealing with access tokens and refresh tokens for multiple APIs can be tricky. The challenge arises when an access token expires and needs to be updated without disrupting the functionality of the application.

The current solution involves manually updating the access token in every function that requires it, which is not ideal as it may lead to errors if the refresh token also expires.

getAllBuckets(account: GetAllBucket){
    const {project, accessToken} = account
    const qs = new URLSearchParams({project})
    return this.http.get(`${this.urlGoogleStorage}?${qs.toString()}`, { headers: {Authorization: `Bearer ${accessToken}`}}).pipe(
      catchError((error) => {
        if(error.status == 401) this.auth.updateAccessToken(account);
        return throwError(() => error)
      })
    )
  }

Is there a more efficient way to handle access token expiration and renewal across multiple APIs?

javascript angular typescript angular-httpclient rxjs-observables

Answer 1

Answer №1

Angular's Http interceptor feature is perfect for handling these types of scenarios. With an interceptor, you can intercept every request made from your Angular project, acting as a middleware for HTTP calls.

To create an interceptor, you can follow this example:

@Injectable({
  providedIn: 'root',
})
export class TokenInterceptorService implements HttpInterceptor {
  constructor(private auth: TokenService) {}
  intercept(
request: HttpRequest<any>,
next: HttpHandler
): Observable<HttpEvent<any>> {
let token = this.auth.getToken();

// Include your token in every request
request = request.clone({
  setHeaders: {
    Authorization: `Bearer ${token}`,
  },
});

return next.handle(request).pipe(
  catchError(res=>{
    if(res instanceof HttpErrorResponse && res.status===401){
      // Your custom logic to update token can go here
      let newToken = this.auth.updateAccessToken(account);

      request = request.clone({
        setHeaders: {
          Authorization: `Bearer ${newToken}`,
        },
      });
      
      next.handle(request);
    }else{
      return throwError(res);
    }
  })
);

}

You need to provide this interceptor in the root module like so:

@NgModule({
declarations: [..],
imports: [
...
],
providers: [
   {
     provide: HTTP_INTERCEPTORS,
     useClass: TokenInterceptorService ,
     multi: true,
   },
 ],

Now, every HTTP call made by a service that is provided in the root will pass through this interceptor. You have the flexibility to modify requests based on your requirements within the interceptor service.

For more information, refer to the documentation here.

Answer 2

Angular's Http interceptor feature is perfect for handling these types of scenarios. With an interceptor, you can intercept every request made from your Angular project, acting as a middleware for HTTP calls.

To create an interceptor, you can follow this example:

@Injectable({
  providedIn: 'root',
})
export class TokenInterceptorService implements HttpInterceptor {
  constructor(private auth: TokenService) {}
  intercept(
request: HttpRequest<any>,
next: HttpHandler
): Observable<HttpEvent<any>> {
let token = this.auth.getToken();

// Include your token in every request
request = request.clone({
  setHeaders: {
    Authorization: `Bearer ${token}`,
  },
});

return next.handle(request).pipe(
  catchError(res=>{
    if(res instanceof HttpErrorResponse && res.status===401){
      // Your custom logic to update token can go here
      let newToken = this.auth.updateAccessToken(account);

      request = request.clone({
        setHeaders: {
          Authorization: `Bearer ${newToken}`,
        },
      });
      
      next.handle(request);
    }else{
      return throwError(res);
    }
  })
);

}

You need to provide this interceptor in the root module like so:

@NgModule({
declarations: [..],
imports: [
...
],
providers: [
   {
     provide: HTTP_INTERCEPTORS,
     useClass: TokenInterceptorService ,
     multi: true,
   },
 ],

Now, every HTTP call made by a service that is provided in the root will pass through this interceptor. You have the flexibility to modify requests based on your requirements within the interceptor service.

For more information, refer to the documentation here.

Angular HTTP client implementation with retry logic using alternative access token

Answer №1

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