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import { Observable, throwError as observableThrowError } from 'rxjs'
import { catchError, switchMap } from 'rxjs/operators'
import { Injectable, Injector } from '@angular/core'
import { HTTP_INTERCEPTORS, HttpEvent, HttpHandler, HttpInterceptor, HttpRequest } from '@angular/common/http'
import { AuthService } from '../../core'
@Injectable()
export class AuthInterceptor implements HttpInterceptor {
private authService: AuthService
// https://github.com/angular/angular/issues/18224#issuecomment-316957213
constructor (private injector: Injector) {}
intercept (req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
if (this.authService === undefined) {
this.authService = this.injector.get(AuthService)
}
const authReq = this.cloneRequestWithAuth(req)
// Pass on the cloned request instead of the original request
// Catch 401 errors (refresh token expired)
return next.handle(authReq)
.pipe(
catchError(err => {
if (err.status === 401 && err.error && err.error.code === 'invalid_token') {
return this.handleTokenExpired(req, next)
}
return observableThrowError(err)
})
)
}
private handleTokenExpired (req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
return this.authService.refreshAccessToken()
.pipe(
switchMap(() => {
const authReq = this.cloneRequestWithAuth(req)
return next.handle(authReq)
})
)
}
private cloneRequestWithAuth (req: HttpRequest<any>) {
const authHeaderValue = this.authService.getRequestHeaderValue()
if (authHeaderValue === null) return req
// Clone the request to add the new header
return req.clone({ headers: req.headers.set('Authorization', authHeaderValue) })
}
}
export const AUTH_INTERCEPTOR_PROVIDER = {
provide: HTTP_INTERCEPTORS,
useClass: AuthInterceptor,
multi: true
}
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