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TokenInterceptor - Async HTTP Interceptors with Angular 4
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| import { Injectable } from '@angular/core'; | |
| import { HttpErrorResponse, HttpHandler, HttpInterceptor, HttpRequest } from '@angular/common/http'; | |
| import { Observable } from 'rxjs/Observable'; | |
| import 'rxjs/add/operator/mergeMap'; | |
| import { AuthService } from './auth.service'; | |
| @Injectable() | |
| export class TokenInterceptor implements HttpInterceptor { | |
| constructor (private auth: AuthService) {} | |
| intercept (request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> { | |
| return this.auth.getUser() | |
| .mergeMap((user: User) => { | |
| if (user) { | |
| // clone and modify the request | |
| request = request.clone({ | |
| setHeaders: { | |
| Authorization: `Bearer ${user.access_token}` | |
| } | |
| }); | |
| } | |
| return next.handle(request) | |
| // new | |
| .do(() => { | |
| // success | |
| }, (err: any) => { | |
| // error | |
| if (err instanceof HttpErrorResponse) { | |
| if (err.status === 401) { | |
| // redirect user to login | |
| this.auth.login(); | |
| } | |
| } | |
| }); | |
| }); | |
| } | |
| } |
Thank you! This has helped me a lot.
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In this way, I always get below errors. I am frustrated and don't know what should I do.... Any help is very appreciated.
Observable.js:54 RangeError: Maximum call stack size exceeded at FilterSubscriber.push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber.error (Subscriber.js:56) at MergeMapSubscriber.push../node_modules/rxjs/_esm5/internal/OuterSubscriber.js.OuterSubscriber.notifyError (OuterSubscriber.js:13) at InnerSubscriber.push../node_modules/rxjs/_esm5/internal/InnerSubscriber.js.InnerSubscriber._error (InnerSubscriber.js:18) at InnerSubscriber.push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber.error (Subscriber.js:59) at MergeMapSubscriber.push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber._error (Subscriber.js:79) at MergeMapSubscriber.push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber.error (Subscriber.js:59) at MapSubscriber.push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber._error (Subscriber.js:79) at MapSubscriber.push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber.error (Subscriber.js:59) at MapSubscriber.push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber._error (Subscriber.js:79) at MapSubscriber.push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber.error (Subscriber.js:59)My package.json:
"@angular/common": "^6.0.1",
"@angular/compiler": "^6.0.1",
"@angular/core": "^6.0.1",
"rxjs": "^6.4.0",
"rxjs-compat": "^6.4.0",