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'
10 export class AuthInterceptor implements HttpInterceptor {
11 private authService: AuthService
13 // https://github.com/angular/angular/issues/18224#issuecomment-316957213
14 constructor (private injector: Injector, private router: Router) {}
16 intercept (req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
17 if (this.authService === undefined) {
18 this.authService = this.injector.get(AuthService)
21 const authReq = this.cloneRequestWithAuth(req)
23 // Pass on the cloned request instead of the original request
24 // Catch 401 errors (refresh token expired)
25 return next.handle(authReq)
27 catchError((err: HttpErrorResponse) => {
28 if (err.status === HttpStatusCode.UNAUTHORIZED_401 && err.error && err.error.code === 'invalid_token') {
29 return this.handleTokenExpired(req, next)
32 if (err.status === HttpStatusCode.UNAUTHORIZED_401) {
33 return this.handleNotAuthenticated(err)
36 return observableThrowError(err)
41 private handleTokenExpired (req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
42 return this.authService.refreshAccessToken()
45 const authReq = this.cloneRequestWithAuth(req)
47 return next.handle(authReq)
52 private cloneRequestWithAuth (req: HttpRequest<any>) {
53 const authHeaderValue = this.authService.getRequestHeaderValue()
55 if (authHeaderValue === null) return req
57 // Clone the request to add the new header
58 return req.clone({ headers: req.headers.set('Authorization', authHeaderValue) })
61 private handleNotAuthenticated (err: HttpErrorResponse, path = '/login'): Observable<any> {
62 this.router.navigateByUrl(path)
63 return of(err.message)
67 export const AUTH_INTERCEPTOR_PROVIDER = {
68 provide: HTTP_INTERCEPTORS,
69 useClass: AuthInterceptor,