fix(core): limit DateHeaderTimeSyncInterceptor to IAM API responses only

lib/core/src/lib/auth/oidc/date-header-time-sync.interceptor.spec.ts

@@ -20,19 +20,27 @@ import { HttpTestingController, provideHttpClientTesting } from '@angular/common
 import { TestBed } from '@angular/core/testing';
 import { TimeSyncService } from '../services/time-sync.service';
 import { DateHeaderTimeSyncInterceptor } from './date-header-time-sync.interceptor';
+import { AppConfigService } from '../../app-config/app-config.service';
 
 describe('DateHeaderTimeSyncInterceptor', () => {
     let httpMock: HttpTestingController;
     let timeSyncServiceSpy: jasmine.SpyObj<TimeSyncService>;
     let httpClient: HttpClient;
+    let appConfigServiceMock: jasmine.SpyObj<AppConfigService>;
+
+    const IAM_HOST = 'https://iam.example.com/auth/realms/alfresco';
 
     beforeEach(() => {
         timeSyncServiceSpy = jasmine.createSpyObj('TimeSyncService', ['updateClockOffsetFromDateHeader']);
+        appConfigServiceMock = jasmine.createSpyObj('AppConfigService', ['get'], {
+            oauth2: { host: IAM_HOST }
+        });
 
         TestBed.configureTestingModule({
             providers: [
                 DateHeaderTimeSyncInterceptor,
                 { provide: TimeSyncService, useValue: timeSyncServiceSpy },
+                { provide: AppConfigService, useValue: appConfigServiceMock },
                 { provide: HTTP_INTERCEPTORS, useClass: DateHeaderTimeSyncInterceptor, multi: true },
                 provideHttpClient(withInterceptorsFromDi()),
                 provideHttpClientTesting()
@@ -47,33 +55,56 @@ describe('DateHeaderTimeSyncInterceptor', () => {
         httpMock.verify();
     });
 
-    it('should call updateClockOffsetFromDateHeader when response contains a Date header', () => {
+    it('should call updateClockOffsetFromDateHeader when IAM response contains a Date header', () => {
         const requestStartTime = 1728911579000;
         spyOn(Date, 'now').and.returnValue(requestStartTime);
 
+        const iamUrl = `${IAM_HOST}/protocol/openid-connect/token`;
+        httpClient.get(iamUrl).subscribe();
+
+        const req = httpMock.expectOne(iamUrl);
+        req.flush({}, { headers: { date: 'Mon, 14 Oct 2024 13:12:59 GMT' } });
+
+        expect(timeSyncServiceSpy.updateClockOffsetFromDateHeader).toHaveBeenCalledWith('Mon, 14 Oct 2024 13:12:59 GMT', requestStartTime);
+    });
+
+    it('should not call updateClockOffsetFromDateHeader for non-IAM URLs', () => {
+        httpClient.get('/api/content/nodes').subscribe();
+
+        const req = httpMock.expectOne('/api/content/nodes');
+        req.flush({}, { headers: { date: 'Mon, 14 Oct 2024 13:12:59 GMT' } });
+
+        expect(timeSyncServiceSpy.updateClockOffsetFromDateHeader).not.toHaveBeenCalled();
+    });
+
+    it('should not call updateClockOffsetFromDateHeader when IAM response has no Date header', () => {
+        const iamUrl = `${IAM_HOST}/protocol/openid-connect/token`;
+        httpClient.get(iamUrl).subscribe();
+
+        const req = httpMock.expectOne(iamUrl);
+        req.flush({});
+
+        expect(timeSyncServiceSpy.updateClockOffsetFromDateHeader).not.toHaveBeenCalled();
+    });
+
+    it('should not call updateClockOffsetFromDateHeader when oauth2 host is not configured', () => {
+        (Object.getOwnPropertyDescriptor(appConfigServiceMock, 'oauth2')?.get as jasmine.Spy).and.returnValue({ host: '' });
+
         httpClient.get('/test').subscribe();
 
         const req = httpMock.expectOne('/test');
         req.flush({}, { headers: { date: 'Mon, 14 Oct 2024 13:12:59 GMT' } });
 
-        expect(timeSyncServiceSpy.updateClockOffsetFromDateHeader).toHaveBeenCalledWith('Mon, 14 Oct 2024 13:12:59 GMT', requestStartTime);
-    });
-
-    it('should not call updateClockOffsetFromDateHeader when response has no Date header', () => {
-        httpClient.get('/test').subscribe();
-
-        const req = httpMock.expectOne('/test');
-        req.flush({});
-
         expect(timeSyncServiceSpy.updateClockOffsetFromDateHeader).not.toHaveBeenCalled();
     });
 
     it('should pass through the request unchanged', () => {
-        httpClient.get('/test').subscribe();
+        const iamUrl = `${IAM_HOST}/protocol/openid-connect/token`;
+        httpClient.get(iamUrl).subscribe();
 
-        const req = httpMock.expectOne('/test');
+        const req = httpMock.expectOne(iamUrl);
         expect(req.request.method).toBe('GET');
-        expect(req.request.url).toBe('/test');
+        expect(req.request.url).toBe(iamUrl);
         req.flush({ data: 'value' });
     });
 });

lib/core/src/lib/auth/oidc/date-header-time-sync.interceptor.ts

@@ -20,26 +20,31 @@ import { HttpEvent, HttpHandler, HttpInterceptor, HttpRequest, HttpResponse } fr
 import { Observable } from 'rxjs';
 import { tap } from 'rxjs/operators';
 import { TimeSyncService } from '../services/time-sync.service';
+import { AppConfigService } from '../../app-config/app-config.service';
 
 /**
  * HTTP interceptor that passively keeps the clock offset in `TimeSyncService` up-to-date
- * by reading the standard `Date` response header (RFC 7231) from every HTTP response.
+ * by reading the standard `Date` response header (RFC 7231) from IAM API responses.
  *
- * This removes the need for a dedicated `serverTimeUrl` endpoint: as long as HTTP responses
- * include a `Date` header (all well-behaved HTTP/1.1 and HTTP/2 servers do), the clock drift
- * correction will be applied transparently without an extra network round-trip.
+ * Only responses whose URL starts with the configured OAuth2 host (`oauth2.host`) are
+ * processed, avoiding unnecessary offset recalculations on every HTTP call.
+ *
+ * This removes the need for a dedicated `serverTimeUrl` endpoint: as long as IAM responses
+ * include a `Date` header, the clock drift correction will be applied transparently
+ * without an extra network round-trip.
  *
  * The interceptor is registered automatically when `provideCoreAuth()` is used.
  */
 @Injectable()
 export class DateHeaderTimeSyncInterceptor implements HttpInterceptor {
     private readonly _timeSyncService = inject(TimeSyncService);
+    private readonly _appConfigService = inject(AppConfigService);
 
     intercept(request: HttpRequest<unknown>, next: HttpHandler): Observable<HttpEvent<unknown>> {
         const requestStartTime = Date.now();
         return next.handle(request).pipe(
             tap((event) => {
-                if (event instanceof HttpResponse) {
+                if (event instanceof HttpResponse && this.isIamRequest(event.url ?? request.url)) {
                     const dateHeader = event.headers.get('date');
                     if (dateHeader) {
                         this._timeSyncService.updateClockOffsetFromDateHeader(dateHeader, requestStartTime);
@@ -48,4 +53,9 @@ export class DateHeaderTimeSyncInterceptor implements HttpInterceptor {
             })
         );
     }
+
+    private isIamRequest(url: string): boolean {
+        const iamHost = this._appConfigService.oauth2?.host;
+        return !!iamHost && url.startsWith(iamHost);
+    }
 }