fix(router): ensure URL is updated after second redirect with UrlUpdateStrategy="eager" (#27523)

Navigating to a route such as `/users`, you may get redirected to `/login`. Previously, if you go then route to `/users` again the URL will end up showing `/users` after the second redirect. This only happened in `UrlUpdateStrategy="eager"`. This is now fixed so after the second redirect, the URL shows the correct page.

Fixes #27116

PR Close #27523

packages/router/src/router.ts

@@ -291,6 +291,7 @@ function defaultRouterHook(snapshot: RouterStateSnapshot, runExtras: {
 export class Router {
   private currentUrlTree: UrlTree;
   private rawUrlTree: UrlTree;
+  private browserUrlTree: UrlTree;
   private readonly transitions: BehaviorSubject<NavigationTransition>;
   private navigations: Observable<NavigationTransition>;
   private lastSuccessfulNavigation: Navigation|null = null;
@@ -400,6 +401,7 @@ export class Router {
     this.resetConfig(config);
     this.currentUrlTree = createEmptyUrlTree();
     this.rawUrlTree = this.currentUrlTree;
+    this.browserUrlTree = this.parseUrl(this.location.path());
 
     this.configLoader = new RouterConfigLoader(loader, compiler, onLoadStart, onLoadEnd);
     this.routerState = createEmptyState(this.currentUrlTree, this.rootComponentType);
@@ -461,7 +463,7 @@ export class Router {
           return of (t).pipe(
               switchMap(t => {
                 const urlTransition =
-                    !this.navigated || t.extractedUrl.toString() !== this.currentUrlTree.toString();
+                    !this.navigated || t.extractedUrl.toString() !== this.browserUrlTree.toString();
                 const processCurrentUrl =
                     (this.onSameUrlNavigation === 'reload' ? true : urlTransition) &&
                     this.urlHandlingStrategy.shouldProcessUrl(t.rawUrl);
@@ -502,8 +504,12 @@ export class Router {
                           this.paramsInheritanceStrategy, this.relativeLinkResolution),
 
                       // Update URL if in `eager` update mode
-                      tap(t => this.urlUpdateStrategy === 'eager' && !t.extras.skipLocationChange &&
-                              this.setBrowserUrl(t.urlAfterRedirects, !!t.extras.replaceUrl, t.id)),
+                      tap(t => {
+                        if (this.urlUpdateStrategy === 'eager' && !t.extras.skipLocationChange) {
+                          this.setBrowserUrl(t.urlAfterRedirects, !!t.extras.replaceUrl, t.id);
+                          this.browserUrlTree = t.urlAfterRedirects;
+                        }
+                      }),
 
                       // Fire RoutesRecognized
                       tap(t => {
@@ -665,6 +671,7 @@ export class Router {
 
                 if (this.urlUpdateStrategy === 'deferred' && !t.extras.skipLocationChange) {
                   this.setBrowserUrl(this.rawUrlTree, !!t.extras.replaceUrl, t.id, t.extras.state);
+                  this.browserUrlTree = t.urlAfterRedirects;
                 }
               }),
 

packages/router/test/integration.spec.ts

@@ -13,7 +13,7 @@ import {ComponentFixture, TestBed, fakeAsync, inject, tick} from '@angular/core/
 import {By} from '@angular/platform-browser/src/dom/debug/by';
 import {expect} from '@angular/platform-browser/testing/src/matchers';
 import {fixmeIvy} from '@angular/private/testing';
-import {ActivatedRoute, ActivatedRouteSnapshot, ActivationEnd, ActivationStart, CanActivate, CanDeactivate, ChildActivationEnd, ChildActivationStart, DetachedRouteHandle, Event, GuardsCheckEnd, GuardsCheckStart, Navigation, NavigationCancel, NavigationEnd, NavigationError, NavigationStart, PRIMARY_OUTLET, ParamMap, Params, PreloadAllModules, PreloadingStrategy, Resolve, ResolveEnd, ResolveStart, RouteConfigLoadEnd, RouteConfigLoadStart, RouteReuseStrategy, Router, RouterEvent, RouterModule, RouterPreloader, RouterStateSnapshot, RoutesRecognized, RunGuardsAndResolvers, UrlHandlingStrategy, UrlSegmentGroup, UrlSerializer, UrlTree} from '@angular/router';
+import {ActivatedRoute, ActivatedRouteSnapshot, ActivationEnd, ActivationStart, CanActivate, CanDeactivate, ChildActivationEnd, ChildActivationStart, DefaultUrlSerializer, DetachedRouteHandle, Event, GuardsCheckEnd, GuardsCheckStart, Navigation, NavigationCancel, NavigationEnd, NavigationError, NavigationStart, PRIMARY_OUTLET, ParamMap, Params, PreloadAllModules, PreloadingStrategy, Resolve, ResolveEnd, ResolveStart, RouteConfigLoadEnd, RouteConfigLoadStart, RouteReuseStrategy, Router, RouterEvent, RouterModule, RouterPreloader, RouterStateSnapshot, RoutesRecognized, RunGuardsAndResolvers, UrlHandlingStrategy, UrlSegmentGroup, UrlSerializer, UrlTree} from '@angular/router';
 import {Observable, Observer, Subscription, of } from 'rxjs';
 import {filter, first, map, tap} from 'rxjs/operators';
 
@@ -575,6 +575,21 @@ describe('Integration', () => {
        expect(fixture.nativeElement).toHaveText('team 33 [ , right:  ]');
      })));
 
+  describe('"eager" urlUpdateStrategy', () => {
+    beforeEach(() => {
+      const serializer = new DefaultUrlSerializer();
+      TestBed.configureTestingModule({
+        providers: [{
+          provide: 'authGuardFail',
+          useValue: (a: any, b: any) => {
+            return new Promise(res => { setTimeout(() => res(serializer.parse('/login')), 1); });
+          }
+        }]
+      });
+
+    });
+
+
     it('should eagerly update the URL with urlUpdateStrategy="eagar"',
        fakeAsync(inject([Router, Location], (router: Router, location: Location) => {
          const fixture = TestBed.createComponent(RootCmp);
@@ -599,6 +614,35 @@ describe('Integration', () => {
          advance(fixture);
          expect(fixture.nativeElement).toHaveText('team 33 [ , right:  ]');
        })));
+    it('should eagerly update the URL with urlUpdateStrategy="eagar"',
+       fakeAsync(inject([Router, Location], (router: Router, location: Location) => {
+         const fixture = TestBed.createComponent(RootCmp);
+         advance(fixture);
+
+         router.urlUpdateStrategy = 'eager';
+
+         router.resetConfig([
+           {path: 'team/:id', component: SimpleCmp, canActivate: ['authGuardFail']},
+           {path: 'login', component: AbsoluteSimpleLinkCmp}
+         ]);
+
+         router.navigateByUrl('/team/22');
+         advance(fixture);
+         expect(location.path()).toEqual('/team/22');
+
+         // Redirects to /login
+         advance(fixture, 1);
+         expect(location.path()).toEqual('/login');
+
+         // Perform the same logic again, and it should produce the same result
+         router.navigateByUrl('/team/22');
+         advance(fixture);
+         expect(location.path()).toEqual('/team/22');
+
+         // Redirects to /login
+         advance(fixture, 1);
+         expect(location.path()).toEqual('/login');
+       })));
 
     it('should eagerly update URL after redirects are applied with urlUpdateStrategy="eagar"',
        fakeAsync(inject([Router, Location], (router: Router, location: Location) => {
@@ -634,6 +678,8 @@ describe('Integration', () => {
          expect(fixture.nativeElement).toHaveText('team 33 [ , right:  ]');
        })));
 
+  });
+
   it('should navigate back and forward',
      fakeAsync(inject([Router, Location], (router: Router, location: Location) => {
        const fixture = createRoot(router, RootCmp);
@@ -4667,6 +4713,10 @@ class DummyLinkCmp {
   }
 }
 
+@Component({selector: 'link-cmp', template: `<a [routerLink]="['/simple']">link</a>`})
+class AbsoluteSimpleLinkCmp {
+}
+
 @Component({selector: 'link-cmp', template: `<a [routerLink]="['../simple']">link</a>`})
 class RelativeLinkCmp {
 }
@@ -4847,8 +4897,8 @@ class ThrowingCmp {
 
 
 
-function advance(fixture: ComponentFixture<any>): void {
-  tick();
+function advance(fixture: ComponentFixture<any>, millis?: number): void {
+  tick(millis);
   fixture.detectChanges();
 }
 
@@ -4876,6 +4926,7 @@ class LazyComponent {
     StringLinkCmp,
     DummyLinkCmp,
     AbsoluteLinkCmp,
+    AbsoluteSimpleLinkCmp,
     RelativeLinkCmp,
     DummyLinkWithParentCmp,
     LinkWithQueryParamsAndFragment,
@@ -4904,6 +4955,7 @@ class LazyComponent {
     StringLinkCmp,
     DummyLinkCmp,
     AbsoluteLinkCmp,
+    AbsoluteSimpleLinkCmp,
     RelativeLinkCmp,
     DummyLinkWithParentCmp,
     LinkWithQueryParamsAndFragment,
@@ -4934,6 +4986,7 @@ class LazyComponent {
     StringLinkCmp,
     DummyLinkCmp,
     AbsoluteLinkCmp,
+    AbsoluteSimpleLinkCmp,
     RelativeLinkCmp,
     DummyLinkWithParentCmp,
     LinkWithQueryParamsAndFragment,