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1 | import { Observable, of, throwError as observableThrowError } from 'rxjs' | |
2 | import { catchError, switchMap } from 'rxjs/operators' | |
3 | import { HTTP_INTERCEPTORS, HttpEvent, HttpHandler, HttpInterceptor, HttpRequest, HttpErrorResponse } from '@angular/common/http' | |
4 | import { Injectable, Injector } from '@angular/core' | |
5 | import { AuthService } from '@app/core/auth/auth.service' | |
6 | import { Router } from '@angular/router' | |
7 | import { HttpStatusCode } from '@shared/core-utils/miscs/http-error-codes' | |
8 | ||
9 | @Injectable() | |
10 | export class AuthInterceptor implements HttpInterceptor { | |
11 | private authService: AuthService | |
12 | ||
13 | // https://github.com/angular/angular/issues/18224#issuecomment-316957213 | |
14 | constructor (private injector: Injector, private router: Router) {} | |
15 | ||
16 | intercept (req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> { | |
17 | if (this.authService === undefined) { | |
18 | this.authService = this.injector.get(AuthService) | |
19 | } | |
20 | ||
21 | const authReq = this.cloneRequestWithAuth(req) | |
22 | ||
23 | // Pass on the cloned request instead of the original request | |
24 | // Catch 401 errors (refresh token expired) | |
25 | return next.handle(authReq) | |
26 | .pipe( | |
27 | catchError((err: HttpErrorResponse) => { | |
28 | if (err.status === HttpStatusCode.UNAUTHORIZED_401 && err.error && err.error.code === 'invalid_token') { | |
29 | return this.handleTokenExpired(req, next) | |
30 | } else if (err.status === HttpStatusCode.UNAUTHORIZED_401) { | |
31 | return this.handleNotAuthenticated(err) | |
32 | } | |
33 | ||
34 | return observableThrowError(err) | |
35 | }) | |
36 | ) | |
37 | } | |
38 | ||
39 | private handleTokenExpired (req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> { | |
40 | return this.authService.refreshAccessToken() | |
41 | .pipe( | |
42 | switchMap(() => { | |
43 | const authReq = this.cloneRequestWithAuth(req) | |
44 | ||
45 | return next.handle(authReq) | |
46 | }) | |
47 | ) | |
48 | } | |
49 | ||
50 | private cloneRequestWithAuth (req: HttpRequest<any>) { | |
51 | const authHeaderValue = this.authService.getRequestHeaderValue() | |
52 | ||
53 | if (authHeaderValue === null) return req | |
54 | ||
55 | // Clone the request to add the new header | |
56 | return req.clone({ headers: req.headers.set('Authorization', authHeaderValue) }) | |
57 | } | |
58 | ||
59 | private handleNotAuthenticated (err: HttpErrorResponse, path = '/login'): Observable<any> { | |
60 | this.router.navigateByUrl(path) | |
61 | return of(err.message) | |
62 | } | |
63 | } | |
64 | ||
65 | export const AUTH_INTERCEPTOR_PROVIDER = { | |
66 | provide: HTTP_INTERCEPTORS, | |
67 | useClass: AuthInterceptor, | |
68 | multi: true | |
69 | } |