Add frontend.

frontend/src/app/app.component.html

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+<app-header></app-header>
+<router-outlet></router-outlet>

frontend/src/app/app.component.scss

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+:host {
+    display: flex;
+    flex-direction: column;
+
+    app-header {
+        width: 100%;
+    }
+}

frontend/src/app/app.component.spec.ts

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+import { TestBed } from '@angular/core/testing';
+import { AppComponent } from './app.component';
+
+describe('AppComponent', () => {
+  beforeEach(async () => {
+    await TestBed.configureTestingModule({
+      imports: [AppComponent],
+    }).compileComponents();
+  });
+
+  it('should create the app', () => {
+    const fixture = TestBed.createComponent(AppComponent);
+    const app = fixture.componentInstance;
+    expect(app).toBeTruthy();
+  });
+
+  it(`should have the 'codiki-ng' title`, () => {
+    const fixture = TestBed.createComponent(AppComponent);
+    const app = fixture.componentInstance;
+    expect(app.title).toEqual('codiki-ng');
+  });
+
+  it('should render title', () => {
+    const fixture = TestBed.createComponent(AppComponent);
+    fixture.detectChanges();
+    const compiled = fixture.nativeElement as HTMLElement;
+    expect(compiled.querySelector('h1')?.textContent).toContain('Hello, codiki-ng');
+  });
+});

frontend/src/app/app.component.ts

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+import { CommonModule } from '@angular/common';
+import { Component } from '@angular/core';
+import { RouterOutlet } from '@angular/router';
+import { HeaderComponent } from './components/header/header.component';
+
+@Component({
+  selector: 'app-root',
+  standalone: true,
+  imports: [
+    CommonModule,
+    RouterOutlet,
+    HeaderComponent
+  ],
+  templateUrl: './app.component.html',
+  styleUrl: './app.component.scss'
+})
+export class AppComponent {
+  title = 'codiki-ng';
+}

frontend/src/app/app.config.ts

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+import { ApplicationConfig } from '@angular/core';
+import { provideRouter } from '@angular/router';
+
+import { routes } from './app.routes';
+import { provideAnimationsAsync } from '@angular/platform-browser/animations/async';
+import { provideHttpClient } from '@angular/common/http';
+
+export const appConfig: ApplicationConfig = {
+  providers: [
+    provideRouter(routes), 
+    provideAnimationsAsync(),
+    provideHttpClient()
+  ]
+};

frontend/src/app/app.routes.ts

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+import { Routes } from '@angular/router';
+
+export const routes: Routes = [
+    { path: 'login', loadComponent: () => import('./pages/login/login.component').then(module => module.LoginComponent) },
+    { path: '**', loadComponent: () => import('./pages/home/home.component').then(module => module.HomeComponent) }
+];

frontend/src/app/components/header/header.component.html

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+<div>
+    <button type="button">
+        <mat-icon>menu</mat-icon>
+    </button>
+    <img src="assets/images/codiki.png" alt="logo"/>
+    <span class="title">Codiki</span>
+</div>
+<div>
+    <input name="search-query" placeholder="Search something..." />
+    <button type="button">
+        <mat-icon>search</mat-icon>
+    </button>
+</div>
+<div>
+    <a [routerLink]="['/login']">Login</a>
+</div>

frontend/src/app/components/header/header.component.scss

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+$headerHeight: 3.5em;
+
+:host {
+    display: flex;
+    flex-direction: row;
+    justify-content: space-between;
+    background-color: #3f51b5;
+    color: white;
+    position: relative;
+    border: 1px solid black;
+    height: $headerHeight;
+
+    div {
+        border: 1px solid black;
+        display: flex;
+        flex-direction: row;
+        justify-content: center;
+        height: $headerHeight;
+
+        &:nth-child(1) {
+            position: absolute;
+            top: 0;
+            left: 0;
+            align-items: center;
+            gap: 1em;
+            padding: 0 1em;
+
+            img {
+                $imageSize: 2em;
+                width: $imageSize;
+                height: $imageSize;
+            }
+
+            .title {
+                font-size: 1.5em;
+            }
+        }
+
+        &:nth-child(2) {
+            flex: 1;
+            $borderRadiusValue: 10em;
+
+            input {
+                flex: 1;
+                width: 60%;
+                max-width: 50em;
+                border-radius: $borderRadiusValue 0 0 $borderRadiusValue;
+                background-color: white;
+                border: solid 1px #ccc;
+                margin: .5em 0;
+                padding: .2em .5em;
+            }
+
+            button {
+                display: flex;
+                align-items: center;
+                border-radius: 0 $borderRadiusValue $borderRadiusValue 0;
+                background-color: white;
+                border: solid 1px #ccc;
+                margin: .5em 0;
+
+                &:hover {
+                    background-color: #eee;
+                }
+            }
+        }
+
+        &:nth-child(3) {
+            position: absolute;
+            top: 0;
+            right: 0;
+            
+            a {
+                display: flex;
+                justify-content: center;
+                align-items: center;
+                min-width: 5em;
+                color: white;
+            }
+        }
+    }
+}

frontend/src/app/components/header/header.component.ts

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+import { Component } from '@angular/core';
+import { MatIconModule } from '@angular/material/icon';
+import { MatButtonModule } from '@angular/material/button';
+import { RouterModule } from '@angular/router';
+
+@Component({
+  selector: 'app-header',
+  standalone: true,
+  imports: [MatButtonModule, MatIconModule, RouterModule],
+  templateUrl: './header.component.html',
+  styleUrl: './header.component.scss',
+})
+export class HeaderComponent {}

frontend/src/app/core/model/FormError.ts

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+export interface FormError {
+    fieldName: string;
+    errorMessage: string;
+}

frontend/src/app/core/model/User.ts

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+export interface User {
+    id: string;
+    email: string;
+    pseudo: string;
+    photoId?: string;
+    roles: string[];
+}

frontend/src/app/core/rest-services/model/login.model.ts

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+export interface LoginRequest {
+    email?: string;
+    password?: string;
+}
+
+export interface LoginResponse {
+    tokenType: string,
+    accessToken: string,
+    refreshToken: string
+}

frontend/src/app/core/rest-services/user.rest-service.ts

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+import { HttpClient } from "@angular/common/http";
+import { Injectable, inject } from "@angular/core";
+import { LoginRequest, LoginResponse } from "./model/login.model";
+import { lastValueFrom } from "rxjs";
+
+@Injectable({
+    providedIn: 'root'
+})
+export class UserRestService {
+    private httpClient = inject(HttpClient);
+
+    login(request: LoginRequest): Promise<LoginResponse> {
+        return lastValueFrom(this.httpClient.post<LoginResponse>('/api/users/login', request));
+    }
+}

frontend/src/app/core/service/authentication.service.ts

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+import { Injectable } from "@angular/core";
+import { User } from "../model/User";
+
+const JWT_PARAM = 'jwt';
+
+interface UserDetails {
+    sub: string;
+    exp: number;
+    email: string;
+    pseudo: string;
+    roles: string;
+}
+
+@Injectable({
+    providedIn: 'root'
+})
+export class AuthenticationService {
+    authenticate(token: string): void {
+        localStorage.setItem(JWT_PARAM, token);
+    }
+
+    unauthenticate(): void {
+        localStorage.removeItem(JWT_PARAM);
+    }
+    
+    isAuthenticated(): boolean {
+        let result = false;
+
+        const userDetails = this.extractUserDetails();
+        
+        if (userDetails) {
+            const authenticationExpiration = new Date(userDetails.exp * 1000);
+            result = authenticationExpiration > new Date();
+        }
+
+        return result;
+    }
+
+    private extractUserFromLocalStorage(): User | undefined {
+        let result: User | undefined = undefined;
+
+        const userDetails = this.extractUserDetails();
+        if (userDetails) {
+            const user = this.convertToUser(userDetails);
+            result = user;
+        }
+
+        return result;
+    }
+
+    private extractUserDetails(): UserDetails | undefined {
+        let result: UserDetails | undefined = undefined;
+
+        const token = localStorage.getItem(JWT_PARAM);
+
+        const tokenParts = token?.split('.');
+        if (tokenParts?.length === 3 && tokenParts[1].length) {
+            const userDetails: UserDetails = JSON.parse(tokenParts[1]);
+            result = userDetails;
+        }
+
+        return result;
+    }
+
+    private convertToUser(userDetails: UserDetails): User {
+        return {
+            id: userDetails.sub,
+            email: userDetails.email,
+            pseudo: userDetails.pseudo,
+            roles: userDetails.roles.split(',')
+        };
+    }
+}

frontend/src/app/core/utils/ObjectUtils.ts

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+export function copy<T>(object: T): T {
+    return JSON.parse(
+        JSON.stringify(object)
+    );
+}

frontend/src/app/pages/home/home.component.html

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+<p>home works!</p>

frontend/src/app/pages/home/home.component.spec.ts

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+import { ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { HomeComponent } from './home.component';
+
+describe('HomeComponent', () => {
+  let component: HomeComponent;
+  let fixture: ComponentFixture<HomeComponent>;
+
+  beforeEach(async () => {
+    await TestBed.configureTestingModule({
+      imports: [HomeComponent]
+    })
+    .compileComponents();
+    
+    fixture = TestBed.createComponent(HomeComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});

frontend/src/app/pages/home/home.component.ts

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+import { Component } from '@angular/core';
+
+@Component({
+  selector: 'app-home',
+  standalone: true,
+  imports: [],
+  templateUrl: './home.component.html',
+  styleUrl: './home.component.scss'
+})
+export class HomeComponent {
+
+}

frontend/src/app/pages/login/login.component.html

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+<form [formGroup]="loginForm" (submit)="performLogin()" ngNativeValidate>
+    <h1>Login</h1>
+    <div>
+        <label for="email">
+            Email address
+        </label>
+        <input type="email" formControlName="email" required />
+    </div>
+    <div>
+        <label for="password">
+            Password
+        </label>
+        <input type="password" formControlName="password" required />
+    </div>
+    <button type="submit">Send</button>
+</form>

frontend/src/app/pages/login/login.component.spec.ts

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+import { ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { LoginComponent } from './login.component';
+
+describe('LoginComponent', () => {
+  let component: LoginComponent;
+  let fixture: ComponentFixture<LoginComponent>;
+
+  beforeEach(async () => {
+    await TestBed.configureTestingModule({
+      imports: [LoginComponent]
+    })
+    .compileComponents();
+    
+    fixture = TestBed.createComponent(LoginComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});

frontend/src/app/pages/login/login.component.ts

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+import { Component, OnDestroy, OnInit, inject } from '@angular/core';
+import { FormBuilder, FormControl, FormGroup, ReactiveFormsModule, Validators } from '@angular/forms';
+import { MatSnackBarModule } from '@angular/material/snack-bar';
+import { Subscription, debounceTime, map } from 'rxjs';
+import { LoginService } from './login.service';
+
+@Component({
+  selector: 'app-login',
+  standalone: true,
+  templateUrl: './login.component.html',
+  styleUrl: './login.component.scss',
+  imports: [ ReactiveFormsModule ],
+  providers: [LoginService, MatSnackBarModule]
+})
+export class LoginComponent implements OnInit, OnDestroy {
+  private loginService = inject(LoginService);
+  private formBuilder = inject(FormBuilder);
+  private subscriptions: Subscription[] = [];
+  emailValue: string | undefined;
+  loginForm: FormGroup = this.formBuilder.group({
+    email: new FormControl<string | undefined>('', [Validators.required, Validators.email]),
+    password: new FormControl<string | undefined>('', [Validators.required])
+  });
+
+  ngOnInit(): void {
+    const emailSubscription = this.loginForm.controls['email'].valueChanges
+      .pipe(
+        debounceTime(300),
+        map(value => value?.length ? value as string : '')
+      )
+      .subscribe(email => {
+        this.loginService.editEmail(email);
+      });
+    this.subscriptions.push(emailSubscription);
+
+    const passwordSubscription = this.loginForm.controls['password'].valueChanges
+      .pipe(
+        debounceTime(300),
+        map(value => value?.length ? value as string : '')
+      )
+      .subscribe(password => {
+        this.loginService.editPassword(password);
+      });
+    this.subscriptions.push(passwordSubscription)
+
+    const stateSubscription = this.loginService.state$
+        .subscribe(state => {
+          this.loginForm.controls['email'].setValue(state.request.email, { emitEvent: false });
+          this.loginForm.controls['password'].setValue(state.request.password, { emitEvent: false });
+        });
+    this.subscriptions.push(stateSubscription);
+  }
+
+  ngOnDestroy(): void {
+    this.subscriptions.forEach(subscription => subscription.unsubscribe());
+  }
+
+  performLogin(): void {
+    if (this.loginForm.valid) {
+      this.loginService.performLogin();
+    }
+  }
+}

frontend/src/app/pages/login/login.service.ts

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+import { Injectable, inject } from "@angular/core";
+import { BehaviorSubject, Observable } from "rxjs";
+import { copy } from "../../core/utils/ObjectUtils";
+import { FormError } from "../../core/model/FormError";
+import { UserRestService } from "../../core/rest-services/user.rest-service";
+import { LoginRequest } from "../../core/rest-services/model/login.model";
+import { AuthenticationService } from "../../core/service/authentication.service";
+import { MatSnackBar } from "@angular/material/snack-bar";
+import { Router } from "@angular/router";
+
+export interface LoginState {
+    request: LoginRequest;
+    errors: FormError[]
+}
+
+const DEFAULT_STATE: LoginState = {
+    request: {
+        email: undefined,
+        password: undefined
+    },
+    errors: []
+}
+
+@Injectable()
+export class LoginService {
+    private stateSubject = new BehaviorSubject<LoginState>(copy(DEFAULT_STATE));
+    private userRestService = inject(UserRestService);
+    private authenticationService = inject(AuthenticationService);
+    private snackBar = inject(MatSnackBar);
+    private router = inject(Router);
+    
+    get state$(): Observable<LoginState> {
+        return this.stateSubject.asObservable();
+    }
+
+    private get state(): LoginState {
+        return this.stateSubject.value;
+    }
+
+    private save(newState: LoginState): void {
+        this.stateSubject.next(newState);
+    }
+
+    editEmail(newEmail: string): void {
+        const state = this.state;
+
+        state.request.email = newEmail;
+
+        this.save(state);
+    }
+
+    editPassword(newPassword: string): void {
+        const state = this.state;
+
+        state.request.password = newPassword;
+
+        this.save(state);
+    }
+
+    performLogin(): void {
+        const state = this.state;
+
+        // Check state is valid
+
+        this.userRestService.login(state.request)
+                .then(response => {
+                    this.authenticationService.authenticate(response.accessToken);
+                    this.snackBar.open('Authentication succeeded!', 'Close', { duration: 5000 });
+                    this.router.navigate(['/home']);
+                })
+                .catch(error => {
+                    console.error(error)
+                    this.snackBar.open('Authentication failed.', 'Close', { duration: 5000 });
+                });
+    }
+}

frontend/src/index.html

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+<!doctype html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <title>CodikiNg</title>
+  <base href="/">
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <link rel="icon" type="image/x-icon" href="assets/images/favicon.ico">
+  <link href="https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500&display=swap" rel="stylesheet">
+  <link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
+</head>
+<body class="mat-typography">
+  <app-root></app-root>
+</body>
+</html>

frontend/src/main.ts

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

frontend/src/styles.scss

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+/* You can add global styles to this file, and also import other style files */
+
+html, body { height: 100%; }
+body { margin: 0; font-family: Roboto, "Helvetica Neue", sans-serif; }