TokenRefreshInterceptor

Kind: Class

Source: Frontend/src/app/InterceptorTokenRefresh.ts (line 13)

Part of: Frontend

TokenRefreshInterceptor handles token refresh behavior within the Angular HTTP request pipeline. Its intercept() method receives HTTP events, coordinates refresh handling when authentication state requires it, and returns an Observable<HttpEvent<any>> to continue the request flow.

Implements: HttpInterceptor

Methods

Properties

Where it refuses work

• TokenRefreshInterceptor stops the work with an early return when event.body instanceof Blob || event.body instanceof ArrayBuffer, in 3 places.
• TokenRefreshInterceptor stops the work with an early return when !this.networkService.isOnline().
• TokenRefreshInterceptor stops the work with an early return when error.status === 401 && !this.isRefreshTokenRequest(request).
• TokenRefreshInterceptor stops the work with an early return when body === null || body === undefined.
• TokenRefreshInterceptor stops the work with an early return when Array.isArray(body).
• TokenRefreshInterceptor stops the work with an early return when typeof body === 'string' && this.isoDateRegex.test(body).

Diagram

mermaid
graph LR
  A[Application Request] --> B[HttpClient]
  B --> C[TokenRefreshInterceptor]
  C --> D{Token requires refresh?}
  D -->|No| E[Send Request]
  D -->|Yes| F[Refresh Token]
  F --> E
  E --> G[HTTP Response]
  G --> C
  C --> H[Application]

Usage

ts
import { HTTP_INTERCEPTORS } from '@angular/common/http';
import { TokenRefreshInterceptor } from './InterceptorTokenRefresh';

@NgModule({
  providers: [
    {
      provide: HTTP_INTERCEPTORS,
      useClass: TokenRefreshInterceptor,
      multi: true,
    },
  ],
})
export class AppModule {}

AI Coding Instructions

• Keep intercept() compatible with the Angular HttpInterceptor contract and return an Observable<HttpEvent<any>>.
• Do not subscribe inside the interceptor; compose refresh and request handling with RxJS operators.
• Register this class through the HTTP_INTERCEPTORS provider with multi: true.
• Prevent token refresh requests from being intercepted again, or they may trigger a refresh loop.
• Preserve HTTP errors when refresh handling fails so calling code can handle authentication failures.

Relationships

• IMPORTS → AuthService
• IMPORTS → SppinerService
• IMPORTS → AppSettings
• IMPORTS → NetworkService

Used by

1 reference from 1 file. Each is a place in this repository where the symbol is actually used — go read one rather than trusting an example.

Imported by (1)

• TranslateHandler — Frontend/src/app/app.module.ts:1