feat(client): auth interceptor

client/src/app/services/auth-interceptor.ts

@@ -0,0 +1,19 @@
+import { HttpErrorResponse, HttpEventType, HttpInterceptorFn } from '@angular/common/http';
+import { catchError, throwError } from 'rxjs';
+import { APIService } from './api';
+import { inject } from '@angular/core';
+import { Router } from '@angular/router';
+
+export const authInterceptor: HttpInterceptorFn = (req, next) => {
+  const api = inject(APIService);
+  const router = inject(Router)
+  return next(req).pipe(
+    catchError((err: HttpErrorResponse) => {
+      if (err.status === 401){
+        api.clearAuthState();
+        router.createUrlTree(['/login']);
+      }
+      return throwError(() => err);
+    })
+  )
+};