Answer:66

apps/angular/66-functional-auth-guard/.eslintrc.json

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+{
+  "extends": ["../../../.eslintrc.json"],
+  "ignorePatterns": ["!**/*"],
+  "overrides": [
+    {
+      "files": ["*.ts"],
+      "extends": [
+        "plugin:@nx/angular",
+        "plugin:@angular-eslint/template/process-inline-templates"
+      ],
+      "rules": {
+        "@angular-eslint/directive-selector": [
+          "error",
+          {
+            "type": "attribute",
+            "prefix": "app",
+            "style": "camelCase"
+          }
+        ],
+        "@angular-eslint/component-selector": [
+          "error",
+          {
+            "type": "element",
+            "prefix": "app",
+            "style": "kebab-case"
+          }
+        ]
+      }
+    },
+    {
+      "files": ["*.html"],
+      "extends": ["plugin:@nx/angular-template"],
+      "rules": {}
+    }
+  ]
+}

apps/angular/66-functional-auth-guard/README.md

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+# functional-auth-guard
+
+> author: thomas-laforge
+
+### Run Application
+
+```bash
+npx nx serve angular-functional-auth-guard
+```
+
+### Documentation and Instruction
+
+Challenge documentation is [here](https://angular-challenges.vercel.app/challenges/angular/66-functional-auth-guard/).

apps/angular/66-functional-auth-guard/project.json

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+{
+  "name": "angular-functional-auth-guard",
+  "$schema": "../../../node_modules/nx/schemas/project-schema.json",
+  "projectType": "application",
+  "prefix": "app",
+  "sourceRoot": "apps/angular/66-functional-auth-guard/src",
+  "tags": [],
+  "targets": {
+    "build": {
+      "executor": "@angular/build:application",
+      "outputs": ["{options.outputPath}"],
+      "options": {
+        "outputPath": "dist/apps/angular/66-functional-auth-guard",
+        "browser": "apps/angular/66-functional-auth-guard/src/main.ts",
+        "tsConfig": "apps/angular/66-functional-auth-guard/tsconfig.app.json",
+        "inlineStyleLanguage": "scss",
+        "assets": [
+          {
+            "glob": "**/*",
+            "input": "apps/angular/66-functional-auth-guard/public"
+          }
+        ],
+        "styles": ["apps/angular/66-functional-auth-guard/src/styles.scss"]
+      },
+      "configurations": {
+        "production": {
+          "budgets": [
+            {
+              "type": "initial",
+              "maximumWarning": "500kb",
+              "maximumError": "1mb"
+            },
+            {
+              "type": "anyComponentStyle",
+              "maximumWarning": "4kb",
+              "maximumError": "8kb"
+            }
+          ],
+          "outputHashing": "all"
+        },
+        "development": {
+          "optimization": false,
+          "extractLicenses": false,
+          "sourceMap": true
+        }
+      },
+      "defaultConfiguration": "production"
+    },
+    "serve": {
+      "continuous": true,
+      "executor": "@angular/build:dev-server",
+      "configurations": {
+        "production": {
+          "buildTarget": "angular-functional-auth-guard:build:production"
+        },
+        "development": {
+          "buildTarget": "angular-functional-auth-guard:build:development"
+        }
+      },
+      "defaultConfiguration": "development"
+    },
+    "extract-i18n": {
+      "executor": "@angular/build:extract-i18n",
+      "options": {
+        "buildTarget": "angular-functional-auth-guard:build"
+      }
+    },
+    "lint": {
+      "executor": "@nx/eslint:lint"
+    },
+    "test": {
+      "executor": "@angular/build:unit-test",
+      "options": {
+        "runnerConfig": "apps/angular/66-functional-auth-guard/vitest-base.config.ts"
+      }
+    },
+    "serve-static": {
+      "continuous": true,
+      "executor": "@nx/web:file-server",
+      "options": {
+        "buildTarget": "angular-functional-auth-guard:build",
+        "staticFilePath": "dist/apps/angular/66-functional-auth-guard/browser",
+        "spa": true
+      }
+    }
+  }
+}

apps/angular/66-functional-auth-guard/src/app/admin.component.ts

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+import { ChangeDetectionStrategy, Component } from '@angular/core';
+import { RouterLink } from '@angular/router';
+
+@Component({
+  selector: 'app-admin',
+  template: `
+    <div class="flex min-h-screen flex-col items-center justify-center gap-4 p-8">
+      <h1 class="text-3xl font-bold">Admin</h1>
+      <a class="text-blue-600 underline" routerLink="/">Back to Home</a>
+    </div>
+  `,
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  imports: [RouterLink],
+})
+export class AdminComponent {}

apps/angular/66-functional-auth-guard/src/app/admin.guard.ts

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+import { inject } from '@angular/core';
+import { CanActivateFn, Router } from '@angular/router';
+import { AuthService } from './auth.service';
+
+export const adminGuard: CanActivateFn = () => {
+  const authService = inject(AuthService);
+  const router = inject(Router);
+
+  return authService.isAdmin() || router.createUrlTree(['/']);
+};

apps/angular/66-functional-auth-guard/src/app/app.component.spec.ts

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+import { TestBed } from '@angular/core/testing';
+import { Router, provideRouter } from '@angular/router';
+import { AppComponent } from './app.component';
+import { AuthService } from './auth.service';
+import { routes } from './app.routes';
+
+describe('Functional Auth Guards', () => {
+  beforeEach(() => {
+    TestBed.configureTestingModule({
+      providers: [provideRouter(routes)],
+    });
+    TestBed.createComponent(AppComponent);
+  });
+
+  describe('authGuard', () => {
+    it('should redirect to / when not logged in', async () => {
+      const router = TestBed.inject(Router);
+      await router.navigate(['/dashboard']);
+      expect(router.url).toBe('/');
+    });
+
+    it('should allow navigation when logged in', async () => {
+      const authService = TestBed.inject(AuthService);
+      const router = TestBed.inject(Router);
+      authService.login('user');
+      await router.navigate(['/dashboard']);
+      expect(router.url).toBe('/dashboard');
+    });
+  });
+
+  describe('adminGuard', () => {
+    it('should redirect to / when not logged in', async () => {
+      const router = TestBed.inject(Router);
+      await router.navigate(['/admin']);
+      expect(router.url).toBe('/');
+    });
+
+    it('should redirect to / when logged in as user', async () => {
+      const authService = TestBed.inject(AuthService);
+      const router = TestBed.inject(Router);
+      authService.login('user');
+      await router.navigate(['/admin']);
+      expect(router.url).toBe('/');
+    });
+
+    it('should allow navigation when logged in as admin', async () => {
+      const authService = TestBed.inject(AuthService);
+      const router = TestBed.inject(Router);
+      authService.login('admin');
+      await router.navigate(['/admin']);
+      expect(router.url).toBe('/admin');
+    });
+  });
+});

apps/angular/66-functional-auth-guard/src/app/app.component.ts

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+import { ChangeDetectionStrategy, Component } from '@angular/core';
+import { RouterOutlet } from '@angular/router';
+
+@Component({
+  selector: 'app-root',
+  template: `<router-outlet />`,
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  imports: [RouterOutlet],
+})
+export class AppComponent {}

apps/angular/66-functional-auth-guard/src/app/app.config.ts

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+import {
+  ApplicationConfig,
+  provideBrowserGlobalErrorListeners,
+  provideZoneChangeDetection,
+} from '@angular/core';
+import { provideRouter } from '@angular/router';
+
+import { routes } from './app.routes';
+
+export const appConfig: ApplicationConfig = {
+  providers: [
+    provideBrowserGlobalErrorListeners(),
+    provideZoneChangeDetection({ eventCoalescing: true }),
+    provideRouter(routes),
+  ],
+};

apps/angular/66-functional-auth-guard/src/app/app.routes.ts

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+import { Routes } from '@angular/router';
+import { adminGuard } from './admin.guard';
+import { AdminComponent } from './admin.component';
+import { authGuard } from './auth.guard';
+import { DashboardComponent } from './dashboard.component';
+import { HomeComponent } from './home.component';
+
+export const routes: Routes = [
+  { path: '', component: HomeComponent },
+  { path: 'dashboard', component: DashboardComponent, canActivate: [authGuard] },
+  { path: 'admin', component: AdminComponent, canActivate: [authGuard, adminGuard] },
+];

apps/angular/66-functional-auth-guard/src/app/auth.guard.ts

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+import { inject } from '@angular/core';
+import { CanActivateFn, Router } from '@angular/router';
+import { AuthService } from './auth.service';
+
+export const authGuard: CanActivateFn = () => {
+  const authService = inject(AuthService);
+  const router = inject(Router);
+
+  return authService.isLoggedIn() || router.createUrlTree(['/']);
+};

apps/angular/66-functional-auth-guard/src/app/auth.service.ts

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+import { computed, Injectable, signal } from '@angular/core';
+
+@Injectable({ providedIn: 'root' })
+export class AuthService {
+  private readonly _isLoggedIn = signal(false);
+  private readonly _role = signal<'user' | 'admin'>('user');
+
+  readonly isLoggedIn = this._isLoggedIn.asReadonly();
+  readonly role = this._role.asReadonly();
+  readonly isAdmin = computed(() => this._isLoggedIn() && this._role() === 'admin');
+
+  login(role: 'user' | 'admin'): void {
+    this._isLoggedIn.set(true);
+    this._role.set(role);
+  }
+
+  logout(): void {
+    this._isLoggedIn.set(false);
+    this._role.set('user');
+  }
+}

apps/angular/66-functional-auth-guard/src/app/dashboard.component.ts

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+import { ChangeDetectionStrategy, Component } from '@angular/core';
+import { RouterLink } from '@angular/router';
+
+@Component({
+  selector: 'app-dashboard',
+  template: `
+    <div class="flex min-h-screen flex-col items-center justify-center gap-4 p-8">
+      <h1 class="text-3xl font-bold">Dashboard</h1>
+      <a class="text-blue-600 underline" routerLink="/">Back to Home</a>
+    </div>
+  `,
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  imports: [RouterLink],
+})
+export class DashboardComponent {}

apps/angular/66-functional-auth-guard/src/app/home.component.ts

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+import { ChangeDetectionStrategy, Component, inject } from '@angular/core';
+import { RouterLink } from '@angular/router';
+import { AuthService } from './auth.service';
+
+@Component({
+  selector: 'app-home',
+  template: `
+    <div class="flex min-h-screen flex-col items-center justify-center gap-6 p-8">
+      <h1 class="text-3xl font-bold">Home</h1>
+
+      <p class="text-gray-600">
+        Status:
+        <span class="font-semibold">
+          {{ authService.isLoggedIn() ? 'Logged in as ' + authService.role() : 'Not logged in' }}
+        </span>
+      </p>
+
+      <div class="flex gap-3">
+        <button
+          class="rounded bg-blue-600 px-4 py-2 text-white hover:bg-blue-700"
+          (click)="authService.login('user')">
+          Login as User
+        </button>
+        <button
+          class="rounded bg-purple-600 px-4 py-2 text-white hover:bg-purple-700"
+          (click)="authService.login('admin')">
+          Login as Admin
+        </button>
+        <button
+          class="rounded bg-gray-300 px-4 py-2 text-gray-800 hover:bg-gray-400"
+          (click)="authService.logout()">
+          Logout
+        </button>
+      </div>
+
+      <div class="flex gap-4">
+        <a class="text-blue-600 underline" routerLink="/dashboard">Go to Dashboard</a>
+        <a class="text-blue-600 underline" routerLink="/admin">Go to Admin</a>
+      </div>
+    </div>
+  `,
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  imports: [RouterLink],
+})
+export class HomeComponent {
+  protected authService = inject(AuthService);
+}

apps/angular/66-functional-auth-guard/src/index.html

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+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <title>angular-functional-auth-guard</title>
+    <base href="/" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <link rel="icon" type="image/x-icon" href="favicon.ico" />
+  </head>
+  <body>
+    <app-root></app-root>
+  </body>
+</html>

apps/angular/66-functional-auth-guard/src/main.ts

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+import { bootstrapApplication } from '@angular/platform-browser';
+import { AppComponent } from './app/app.component';
+import { appConfig } from './app/app.config';
+
+bootstrapApplication(AppComponent, appConfig).catch((err) => console.error(err));

apps/angular/66-functional-auth-guard/src/styles.scss

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+@tailwind base;
+@tailwind components;
+@tailwind utilities;