[ACA-3315] - add predefined extension guard (#1478)

* [ACA-3315] - add predefined extension guard

* update extension loader

* update doc

* fix lint

* PR changes

* PR changes

* remove unnecesary code

Co-authored-by: Silviu Popa <p3701014@L3700101120.ness.com>

docs/extending/routes.md

@@ -74,6 +74,7 @@ Below is the list of the authentication guards main application registers on sta
 | Key      | Type         | Description                                                               |
 | -------- | ------------ | ------------------------------------------------------------------------- |
 | app.auth | AuthGuardEcm | ADF guard, validates ACS authentication and redirects to Login if needed. |
+| app.extensions.dataLoaderGuard | ExtensionsDataLoaderGuard | ACA guard, validates EXTENSION_DATA_LOADERS provider and redirects to Login if needed. |
 
 You can refer those guards from within your custom extensions,
 or [register](/extending/registration) your custom implementations.

projects/aca-shared/src/lib/adf-extensions/extensions-data-loader.guard.spec.ts

@@ -131,5 +131,23 @@ describe('ExtensionsDataLoaderGuard', () => {
       expect(erroredSpy).not.toHaveBeenCalled();
       expect(completedSpy).toHaveBeenCalled();
     });
+
+    it('should call canActivate only once', () => {
+      const subject1 = new Subject<true>();
+      const extensionLoaders = {
+        fct1: function() {
+          return subject1.asObservable();
+        }
+      };
+      const extensionLoaderSpy = spyOn(extensionLoaders, 'fct1');
+      const guard = new ExtensionsDataLoaderGuard([extensionLoaders.fct1]);
+
+      guard.canActivate(route).subscribe(emittedSpy, erroredSpy, completedSpy);
+      expect(extensionLoaderSpy).toHaveBeenCalled();
+
+      extensionLoaderSpy.calls.reset();
+      guard.canActivate(route).subscribe(emittedSpy, erroredSpy, completedSpy);
+      expect(extensionLoaderSpy).not.toHaveBeenCalled();
+    });
   });
 });

projects/aca-shared/src/lib/adf-extensions/extensions-data-loader.guard.ts

@@ -45,34 +45,46 @@ export const EXTENSION_DATA_LOADERS = new InjectionToken<
 
 @Injectable({ providedIn: 'root' })
 export class ExtensionsDataLoaderGuard implements CanActivate {
+  private invoked = false;
+
   constructor(
     @Inject(EXTENSION_DATA_LOADERS)
     private extensionDataLoaders: ExtensionLoaderCallback[]
   ) {}
 
   canActivate(route: ActivatedRouteSnapshot): Observable<boolean> {
-    if (!this.extensionDataLoaders.length) {
+    if (!this.invoked) {
+      this.invoked = true;
+
+      if (!this.extensionDataLoaders.length) {
+        return of(true);
+      }
+
+      const dataLoaderCallbacks = this.extensionDataLoaders.map(callback =>
+        callback(route)
+      );
+
+      // Undocumented forkJoin behaviour/bug:
+      // https://github.com/ReactiveX/rxjs/issues/3246
+      // So all callbacks need to emit before completion, otherwise forkJoin will short circuit
+      return forkJoin(...dataLoaderCallbacks).pipe(
+        map(() => true),
+        catchError(e => {
+          // tslint:disable-next-line
+          console.error(
+            'Some of the extension data loader guards has been errored.'
+          );
+          // tslint:disable-next-line
+          console.error(e);
+          return of(true);
+        })
+      );
+    } else {
       return of(true);
     }
+  }
 
-    const dataLoaderCallbacks = this.extensionDataLoaders.map(callback =>
-      callback(route)
-    );
-
-    // Undocumented forkJoin behaviour/bug:
-    // https://github.com/ReactiveX/rxjs/issues/3246
-    // So all callbacks need to emit before completion, otherwise forkJoin will short circuit
-    return forkJoin(...dataLoaderCallbacks).pipe(
-      map(() => true),
-      catchError(e => {
-        // tslint:disable-next-line
-        console.error(
-          'Some of the extension data loader guards has been errored.'
-        );
-        // tslint:disable-next-line
-        console.error(e);
-        return of(true);
-      })
-    );
+  canActivateChild(): Observable<boolean> {
+    return of(true);
   }
 }

src/app/extensions/core.extensions.module.ts

@@ -53,7 +53,10 @@ import { ViewNodeComponent } from '../components/toolbar/view-node/view-node.com
 import { LanguagePickerComponent } from '../components/common/language-picker/language-picker.component';
 import { LogoutComponent } from '../components/common/logout/logout.component';
 import { CurrentUserComponent } from '../components/current-user/current-user.component';
-import { AppExtensionService } from '@alfresco/aca-shared';
+import {
+  AppExtensionService,
+  ExtensionsDataLoaderGuard
+} from '@alfresco/aca-shared';
 
 export function setupExtensions(service: AppExtensionService): Function {
   return () => service.load();
@@ -111,7 +114,8 @@ export class CoreExtensionsModule {
     });
 
     extensions.setAuthGuards({
-      'app.auth': AuthGuardEcm
+      'app.auth': AuthGuardEcm,
+      'app.extensions.dataLoaderGuard': ExtensionsDataLoaderGuard
     });
 
     extensions.setEvaluators({