Merge branch 'main' into task/CAS-75/UpdateFrontendDice

Reviewed-on: #215
Reviewed-by: Constantin Simonis <constantin@simonis.lol>

backend/src/main/java/de/szut/casino/security/oauth2/OAuth2UserInfoFactory.java

@@ -1,6 +1,8 @@
 package de.szut.casino.security.oauth2;
 
 import de.szut.casino.exceptionHandling.exceptions.OAuth2AuthenticationProcessingException;
+import de.szut.casino.security.oauth2.github.GitHubOAuth2UserInfo;
+import de.szut.casino.security.oauth2.google.GoogleOAuth2UserInfo;
 import de.szut.casino.user.AuthProvider;
 
 import java.util.Map;
@@ -10,6 +12,8 @@ public class OAuth2UserInfoFactory {
     public static OAuth2UserInfo getOAuth2UserInfo(String registrationId, Map<String, Object> attributes) {
         if (registrationId.equalsIgnoreCase(AuthProvider.GITHUB.toString())) {
             return new GitHubOAuth2UserInfo(attributes);
+        } else if (registrationId.equalsIgnoreCase(AuthProvider.GOOGLE.toString())) {
+            return new GoogleOAuth2UserInfo(attributes);
         } else {
             throw new OAuth2AuthenticationProcessingException("Sorry! Login with " + registrationId + " is not supported yet.");
         }

backend/src/main/java/de/szut/casino/security/oauth2/github/GitHubController.java

@@ -1,7 +1,6 @@
-package de.szut.casino.security;
+package de.szut.casino.security.oauth2.github;
 
 import de.szut.casino.security.dto.AuthResponseDto;
-import de.szut.casino.security.dto.GithubCallbackDto;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Autowired;

backend/src/main/java/de/szut/casino/security/oauth2/github/GitHubOAuth2UserInfo.java

@@ -1,4 +1,6 @@
-package de.szut.casino.security.oauth2;
+package de.szut.casino.security.oauth2.github;
+
+import de.szut.casino.security.oauth2.OAuth2UserInfo;
 
 import java.util.Map;
 

backend/src/main/java/de/szut/casino/security/oauth2/github/GitHubService.java

@@ -1,12 +1,10 @@
-package de.szut.casino.security;
+package de.szut.casino.security.oauth2.github;
 
 import de.szut.casino.security.dto.AuthResponseDto;
 import de.szut.casino.security.jwt.JwtUtils;
 import de.szut.casino.user.AuthProvider;
 import de.szut.casino.user.UserEntity;
 import de.szut.casino.user.UserRepository;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.http.HttpEntity;

backend/src/main/java/de/szut/casino/security/oauth2/github/GithubCallbackDto.java

@@ -1,4 +1,4 @@
-package de.szut.casino.security.dto;
+package de.szut.casino.security.oauth2.github;
 
 import lombok.Data;
 

backend/src/main/java/de/szut/casino/security/oauth2/google/GoogleController.java

@@ -0,0 +1,49 @@
+package de.szut.casino.security.oauth2.google;
+
+import de.szut.casino.security.dto.AuthResponseDto;
+import de.szut.casino.security.oauth2.github.GithubCallbackDto;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+import org.springframework.web.servlet.view.RedirectView;
+
+@RestController
+@RequestMapping("/oauth2/google")
+public class GoogleController {
+    private static final Logger logger = LoggerFactory.getLogger(GoogleController.class);
+
+    @Value("${spring.security.oauth2.client.registration.google.client-id}")
+    private String clientId;
+
+    @Value("${spring.security.oauth2.client.provider.google.authorization-uri}")
+    private String authorizationUri;
+
+    @Value("${spring.security.oauth2.client.registration.google.redirect-uri}")
+    private String redirectUri;
+
+    @Autowired
+    private GoogleService googleService;
+
+    @GetMapping("/authorize")
+    public RedirectView authorizeGoogle() {
+        logger.info("Redirecting to Google for authorization");
+
+        String authUrl = authorizationUri +
+                "?client_id=" + clientId +
+                "&redirect_uri=" + redirectUri +
+                "&response_type=code" +
+                "&scope=email profile";
+
+        return new RedirectView(authUrl);
+    }
+
+    @PostMapping("/callback")
+    public ResponseEntity<AuthResponseDto> googleCallback(@RequestBody GithubCallbackDto callbackDto) {
+        String code = callbackDto.getCode();
+        AuthResponseDto response = googleService.processGoogleCode(code);
+        return ResponseEntity.ok(response);
+    }
+}

backend/src/main/java/de/szut/casino/security/oauth2/google/GoogleOAuth2UserInfo.java

@@ -0,0 +1,27 @@
+package de.szut.casino.security.oauth2.google;
+
+import de.szut.casino.security.oauth2.OAuth2UserInfo;
+
+import java.util.Map;
+
+public class GoogleOAuth2UserInfo extends OAuth2UserInfo {
+
+    public GoogleOAuth2UserInfo(Map<String, Object> attributes) {
+        super(attributes);
+    }
+
+    @Override
+    public String getId() {
+        return (String) attributes.get("sub");
+    }
+
+    @Override
+    public String getName() {
+        return (String) attributes.get("name");
+    }
+
+    @Override
+    public String getEmail() {
+        return (String) attributes.get("email");
+    }
+}

backend/src/main/java/de/szut/casino/security/oauth2/google/GoogleService.java

@@ -0,0 +1,164 @@
+package de.szut.casino.security.oauth2.google;
+
+import de.szut.casino.security.dto.AuthResponseDto;
+import de.szut.casino.security.jwt.JwtUtils;
+import de.szut.casino.user.AuthProvider;
+import de.szut.casino.user.UserEntity;
+import de.szut.casino.user.UserRepository;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.http.HttpEntity;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpMethod;
+import org.springframework.http.ResponseEntity;
+import org.springframework.security.authentication.AuthenticationManager;
+import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
+import org.springframework.security.core.Authentication;
+import org.springframework.security.crypto.password.PasswordEncoder;
+import org.springframework.stereotype.Service;
+import org.springframework.util.LinkedMultiValueMap;
+import org.springframework.util.MultiValueMap;
+import org.springframework.web.client.RestTemplate;
+
+import java.math.BigDecimal;
+import java.util.*;
+
+@Service
+public class GoogleService {
+    private static final Logger logger = LoggerFactory.getLogger(GoogleService.class);
+
+    @Value("${spring.security.oauth2.client.registration.google.client-id}")
+    private String clientId;
+
+    @Value("${spring.security.oauth2.client.registration.google.client-secret}")
+    private String clientSecret;
+
+    @Value("${spring.security.oauth2.client.registration.google.redirect-uri}")
+    private String redirectUri;
+
+    @Value("${spring.security.oauth2.client.provider.google.token-uri}")
+    private String tokenUri;
+
+    @Value("${spring.security.oauth2.client.provider.google.user-info-uri}")
+    private String userInfoUri;
+
+    @Autowired
+    private AuthenticationManager authenticationManager;
+
+    @Autowired
+    private UserRepository userRepository;
+
+    @Autowired
+    private JwtUtils jwtUtils;
+
+    @Autowired
+    private PasswordEncoder oauth2PasswordEncoder;
+
+    public AuthResponseDto processGoogleCode(String code) {
+        try {
+            RestTemplate restTemplate = new RestTemplate();
+
+            HttpHeaders tokenHeaders = new HttpHeaders();
+            tokenHeaders.set("Content-Type", "application/x-www-form-urlencoded");
+            
+            MultiValueMap<String, String> tokenRequestBody = new LinkedMultiValueMap<>();
+            tokenRequestBody.add("client_id", clientId);
+            tokenRequestBody.add("client_secret", clientSecret);
+            tokenRequestBody.add("code", code);
+            tokenRequestBody.add("redirect_uri", redirectUri);
+            tokenRequestBody.add("grant_type", "authorization_code");
+
+            HttpEntity<MultiValueMap<String, String>> tokenRequestEntity = new HttpEntity<>(tokenRequestBody, tokenHeaders);
+
+            ResponseEntity<Map> tokenResponse = restTemplate.exchange(
+                    tokenUri,
+                    HttpMethod.POST,
+                    tokenRequestEntity,
+                    Map.class
+            );
+
+            Map<String, Object> tokenResponseBody = tokenResponse.getBody();
+
+            if (tokenResponseBody == null || tokenResponseBody.containsKey("error")) {
+                String error = tokenResponseBody != null ? (String) tokenResponseBody.get("error") : "Unknown error";
+                throw new RuntimeException("Google OAuth error: " + error);
+            }
+
+            String accessToken = (String) tokenResponseBody.get("access_token");
+            if (accessToken == null || accessToken.isEmpty()) {
+                throw new RuntimeException("Failed to receive access token from Google");
+            }
+
+            HttpHeaders userInfoHeaders = new HttpHeaders();
+            userInfoHeaders.set("Authorization", "Bearer " + accessToken);
+
+            HttpEntity<String> userInfoRequestEntity = new HttpEntity<>(null, userInfoHeaders);
+
+            ResponseEntity<Map> userResponse = restTemplate.exchange(
+                    userInfoUri,
+                    HttpMethod.GET,
+                    userInfoRequestEntity,
+                    Map.class
+            );
+
+            Map<String, Object> userAttributes = userResponse.getBody();
+            if (userAttributes == null) {
+                throw new RuntimeException("Failed to fetch user data from Google");
+            }
+
+            String googleId = (String) userAttributes.get("sub");
+            String email = (String) userAttributes.get("email");
+            String name = (String) userAttributes.get("name");
+            Boolean emailVerified = (Boolean) userAttributes.getOrDefault("email_verified", false);
+
+            if (email == null) {
+                throw new RuntimeException("Google account does not have an email");
+            }
+
+            String username = name != null ? name.replaceAll("\\s+", "") : email.split("@")[0];
+
+            Optional<UserEntity> userOptional = userRepository.findByProviderId(googleId);
+            UserEntity user;
+
+            if (userOptional.isPresent()) {
+                user = userOptional.get();
+            } else {
+                userOptional = userRepository.findByEmail(email);
+
+                if (userOptional.isPresent()) {
+                    user = userOptional.get();
+                    user.setProvider(AuthProvider.GOOGLE);
+                    user.setProviderId(googleId);
+                } else {
+                    user = new UserEntity();
+                    user.setEmail(email);
+                    user.setUsername(username);
+                    user.setProvider(AuthProvider.GOOGLE);
+                    user.setProviderId(googleId);
+                    user.setEmailVerified(emailVerified);
+                    
+                    user.setBalance(new BigDecimal("100.00"));
+                }
+            }
+
+            String randomPassword = UUID.randomUUID().toString();
+            user.setPassword(oauth2PasswordEncoder.encode(randomPassword));
+
+            userRepository.save(user);
+
+            Authentication authentication = authenticationManager.authenticate(
+                    new UsernamePasswordAuthenticationToken(user.getEmail(), randomPassword)
+            );
+
+            String token = jwtUtils.generateToken(authentication);
+
+            return new AuthResponseDto(token);
+
+        } catch (Exception e) {
+            logger.error("Failed to process Google authentication", e);
+            throw new RuntimeException("Failed to process Google authentication", e);
+        }
+    }
+}

backend/src/main/java/de/szut/casino/security/service/EmailService.java

@@ -28,6 +28,7 @@ public class EmailService {
         this.mailConfig = mailConfig;
         this.mailSender.setHost(mailConfig.host);
         this.mailSender.setPort(mailConfig.port);
+        this.mailSender.setProtocol(mailConfig.protocol);
         if (mailConfig.authenticationEnabled) {
             this.mailSender.setUsername(mailConfig.username);
             this.mailSender.setPassword(mailConfig.password);

backend/src/main/java/de/szut/casino/security/service/MailConfig.java

@@ -22,4 +22,7 @@ public class MailConfig {
 
     @Value("${app.mail.from-address}")
     public String fromAddress;
+
+    @Value("${app.mail.protocol}")
+    public String protocol;
 }

backend/src/main/java/de/szut/casino/user/AuthProvider.java

@@ -2,5 +2,6 @@ package de.szut.casino.user;
 
 public enum AuthProvider {
     LOCAL,
-    GITHUB
+    GITHUB,
+    GOOGLE
 }

backend/src/main/resources/application.properties

@@ -14,6 +14,7 @@ app.mail.port=${MAIL_PORT:1025}
 app.mail.username=${MAIL_USER:null}
 app.mail.password=${MAIL_PASS:null}
 app.mail.from-address=${MAIL_FROM:casino@localhost}
+app.mail.protocol=${MAIL_PROTOCOL:smtp}
 
 spring.application.name=casino
 
@@ -41,3 +42,13 @@ spring.security.oauth2.client.provider.github.user-name-attribute=login
 # OAuth Success and Failure URLs
 app.oauth2.authorizedRedirectUris=${app.frontend-host}/auth/oauth2/callback
 
+# Google OAuth2 Configuration
+spring.security.oauth2.client.registration.google.client-id=${GOOGLE_CLIENT_ID:350791038883-c1r7v4o793itq8a0rh7dut7itm7uneam.apps.googleusercontent.com}
+spring.security.oauth2.client.registration.google.client-secret=${GOOGLE_CLIENT_SECRET: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}
+spring.security.oauth2.client.registration.google.redirect-uri=${app.frontend-host}/oauth2/callback/google
+spring.security.oauth2.client.registration.google.scope=email,profile
+spring.security.oauth2.client.provider.google.authorization-uri=https://accounts.google.com/o/oauth2/v2/auth
+spring.security.oauth2.client.provider.google.token-uri=https://oauth2.googleapis.com/token
+spring.security.oauth2.client.provider.google.user-info-uri=https://www.googleapis.com/oauth2/v3/userinfo
+spring.security.oauth2.client.provider.google.user-name-attribute=sub
+

frontend/src/app/app.component.ts

@@ -1,12 +1,12 @@
 import { Component, HostListener, inject, signal } from '@angular/core';
 import { RouterOutlet } from '@angular/router';
-import { NavbarComponent } from './shared/components/navbar/navbar.component';
-import { FooterComponent } from './shared/components/footer/footer.component';
+import { NavbarComponent } from '@shared/components/navbar/navbar.component';
+import { FooterComponent } from '@shared/components/footer/footer.component';
 import { LoginComponent } from './feature/auth/login/login.component';
 import { RegisterComponent } from './feature/auth/register/register.component';
-import { RecoverPasswordComponent } from './feature/auth/recover-password/recover-password.component';
-import { PlaySoundDirective } from './shared/directives/play-sound.directive';
-import { SoundInitializerService } from './shared/services/sound-initializer.service';
+import RecoverPasswordComponent from './feature/auth/recover-password/recover-password.component';
+import { PlaySoundDirective } from '@shared/directives/play-sound.directive';
+import { SoundInitializerService } from '@shared/services/sound-initializer.service';
 
 @Component({
   selector: 'app-root',

frontend/src/app/app.routes.ts

@@ -14,61 +14,68 @@ export const routes: Routes = [
   },
   {
     path: 'verify',
-    loadComponent: () =>
-      import('./feature/auth/verify-email/verify-email.component').then(
-        (m) => m.VerifyEmailComponent
-      ),
+    loadComponent: () => import('./feature/auth/verify-email/verify-email.component'),
   },
   {
     path: 'recover-password',
-    loadComponent: () =>
-      import('./feature/auth/recover-password/recover-password.component').then(
-        (m) => m.RecoverPasswordComponent
-      ),
+    loadComponent: () => import('./feature/auth/recover-password/recover-password.component'),
   },
   {
     path: 'reset-password',
-    loadComponent: () =>
-      import('./feature/auth/recover-password/recover-password.component').then(
-        (m) => m.RecoverPasswordComponent
-      ),
+    loadComponent: () => import('./feature/auth/recover-password/recover-password.component'),
   },
   {
-    path: 'oauth2/callback/github',
-    loadComponent: () =>
-      import('./feature/auth/oauth2/oauth2-callback.component').then(
-        (m) => m.OAuth2CallbackComponent
-      ),
+    path: 'oauth2/callback',
+    children: [
+      {
+        path: 'github',
+        loadComponent: () => import('./feature/auth/oauth2/oauth2-callback.component'),
+        data: { provider: 'github' },
+      },
+      {
+        path: 'google',
+        loadComponent: () => import('./feature/auth/oauth2/oauth2-callback.component'),
+        data: { provider: 'google' },
+      },
+    ],
   },
   {
-    path: 'game/blackjack',
-    loadComponent: () => import('./feature/game/blackjack/blackjack.component'),
-    canActivate: [authGuard],
-  },
-  {
-    path: 'game/coinflip',
-    loadComponent: () => import('./feature/game/coinflip/coinflip.component'),
-    canActivate: [authGuard],
-  },
-  {
-    path: 'game/slots',
-    loadComponent: () => import('./feature/game/slots/slots.component'),
-    canActivate: [authGuard],
-  },
-  {
-    path: 'game/lootboxes',
-    loadComponent: () =>
-      import('./feature/lootboxes/lootbox-selection/lootbox-selection.component'),
-    canActivate: [authGuard],
-  },
-  {
-    path: 'game/lootboxes/open/:id',
-    loadComponent: () => import('./feature/lootboxes/lootbox-opening/lootbox-opening.component'),
-    canActivate: [authGuard],
-  },
-  {
-    path: 'game/dice',
-    loadComponent: () => import('./feature/game/dice/dice.component').then((m) => m.DiceComponent),
-    canActivate: [authGuard],
+    path: 'game',
+    children: [
+      {
+        path: 'blackjack',
+        loadComponent: () => import('./feature/game/blackjack/blackjack.component'),
+        canActivate: [authGuard],
+      },
+      {
+        path: 'coinflip',
+        loadComponent: () => import('./feature/game/coinflip/coinflip.component'),
+        canActivate: [authGuard],
+      },
+      {
+        path: 'slots',
+        loadComponent: () => import('./feature/game/slots/slots.component'),
+        canActivate: [authGuard],
+      },
+      {
+        path: 'lootboxes',
+        loadComponent: () =>
+          import('./feature/lootboxes/lootbox-selection/lootbox-selection.component'),
+        canActivate: [authGuard],
+        children: [
+          {
+            path: 'open/:id',
+            loadComponent: () =>
+              import('./feature/lootboxes/lootbox-opening/lootbox-opening.component'),
+            canActivate: [authGuard],
+          },
+        ],
+      },
+      {
+        path: 'dice',
+        loadComponent: () => import('./feature/game/dice/dice.component'),
+        canActivate: [authGuard],
+      },
+    ],
   },
 ];

frontend/src/app/feature/auth/login/login.component.html

@@ -89,7 +89,7 @@
       <div class="flex-grow h-px bg-deep-blue-light/30"></div>
     </div>
 
-    <div class="mb-4">
+    <div class="space-y-3 mb-4">
       <button
         (click)="loginWithGithub()"
         class="w-full py-2.5 px-4 rounded flex items-center justify-center bg-gray-800 hover:bg-gray-700 text-white transition-colors"
@@ -106,6 +106,31 @@
         </svg>
         Mit GitHub anmelden
       </button>
+
+      <button
+        (click)="loginWithGoogle()"
+        class="w-full py-2.5 px-4 rounded flex items-center justify-center bg-white hover:bg-gray-100 transition-colors !text-black"
+      >
+        <svg class="h-5 w-5 mr-2" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
+          <path
+            fill="#EA4335"
+            d="M5.266 9.765A7.077 7.077 0 0 1 12 4.909c1.69 0 3.218.6 4.418 1.582L19.91 3C17.782 1.145 15.055 0 12 0 7.27 0 3.198 2.698 1.24 6.65l4.026 3.115Z"
+          />
+          <path
+            fill="#34A853"
+            d="M16.04 18.013c-1.09.703-2.474 1.078-4.04 1.078a7.077 7.077 0 0 1-6.723-4.823l-4.04 3.067A11.965 11.965 0 0 0 12 24c2.933 0 5.735-1.043 7.834-3l-3.793-2.987Z"
+          />
+          <path
+            fill="#4A90E2"
+            d="M19.834 21c2.195-2.048 3.62-5.096 3.62-9 0-.71-.109-1.473-.272-2.182H12v4.637h6.436c-.317 1.559-1.17 2.766-2.395 3.558L19.834 21Z"
+          />
+          <path
+            fill="#FBBC05"
+            d="M5.277 14.268A7.12 7.12 0 0 1 4.909 12c0-.782.125-1.533.357-2.235L1.24 6.65A11.934 11.934 0 0 0 0 12c0 1.92.445 3.73 1.237 5.335l4.04-3.067Z"
+          />
+        </svg>
+        Mit Google anmelden
+      </button>
     </div>
 
     <div class="text-center">

frontend/src/app/feature/auth/login/login.component.ts

@@ -71,6 +71,11 @@ export class LoginComponent {
     window.location.href = `${environment.apiUrl}/oauth2/github/authorize`;
   }
 
+  loginWithGoogle(): void {
+    this.isLoading.set(true);
+    window.location.href = `${environment.apiUrl}/oauth2/google/authorize`;
+  }
+
   switchToForgotPassword() {
     this.forgotPassword.emit();
   }

frontend/src/app/feature/auth/oauth2/oauth2-callback.component.ts

@@ -1,7 +1,7 @@
-import { Component, OnInit } from '@angular/core';
+import { Component, computed, inject, OnInit, Signal } from '@angular/core';
 import { CommonModule } from '@angular/common';
 import { ActivatedRoute, Router } from '@angular/router';
-import { AuthService } from '@service/auth.service';
+import { Oauth2Service } from './oauth2.service';
 
 @Component({
   selector: 'app-oauth2-callback',
@@ -10,51 +10,34 @@ import { AuthService } from '@service/auth.service';
   template: `
     <div class="min-h-screen bg-deep-blue flex items-center justify-center">
       <div class="text-center">
-        <h2 class="text-2xl font-bold text-white mb-4">Finishing authentication...</h2>
+        <h2 class="text-2xl font-bold text-white mb-4">Authentifizierung...</h2>
         <div
           class="animate-spin rounded-full h-12 w-12 border-t-2 border-b-2 border-emerald mx-auto"
         ></div>
-        <p *ngIf="error" class="mt-4 text-accent-red">{{ error }}</p>
+        <p *ngIf="error()" class="mt-4 text-accent-red">{{ error() }}</p>
       </div>
     </div>
   `,
 })
-export class OAuth2CallbackComponent implements OnInit {
-  error: string | null = null;
+export default class OAuth2CallbackComponent implements OnInit {
+  error: Signal<string> = computed(() => this.oauthService.error());
 
-  constructor(
-    private route: ActivatedRoute,
-    private router: Router,
-    private authService: AuthService
-  ) {}
+  private route: ActivatedRoute = inject(ActivatedRoute);
+  private router: Router = inject(Router);
+  private oauthService: Oauth2Service = inject(Oauth2Service);
 
   ngOnInit(): void {
-    // Check for code in URL params
     this.route.queryParams.subscribe((params) => {
       const code = params['code'];
+      const provider = this.route.snapshot.data['provider'] || 'github';
 
       if (code) {
-        // Exchange GitHub code for a JWT token
-        this.authService.githubAuth(code).subscribe({
-          next: () => {
-            // Redirect to home after successful authentication
-            this.router.navigate(['/home']);
-          },
-          error: (err) => {
-            console.error('GitHub authentication error:', err);
-            this.error = err.error?.message || 'Authentication failed. Please try again.';
-            console.log('Error details:', err);
-
-            // Redirect back to landing page after showing error
-            setTimeout(() => {
-              this.router.navigate(['/']);
-            }, 3000);
-          },
-        });
+        this.oauthService.oauth(provider, code);
       } else {
-        this.error = 'Authentication failed. No authorization code received.';
+        this.oauthService.error.set(
+          'Authentifizierung fehlgeschlagen. Bitte versuchen Sie es erneut.'
+        );
 
-        // Redirect back to landing page after showing error
         setTimeout(() => {
           this.router.navigate(['/']);
         }, 3000);

frontend/src/app/feature/auth/oauth2/oauth2.service.ts

@@ -0,0 +1,36 @@
+import { inject, Injectable, signal } from '@angular/core';
+import { Router } from '@angular/router';
+import { AuthService } from '@service/auth.service';
+
+@Injectable({
+  providedIn: 'root',
+})
+export class Oauth2Service {
+  private router: Router = inject(Router);
+  private authService: AuthService = inject(AuthService);
+  private _error = signal<string>('');
+
+  oauth(provider: string, code: string) {
+    const oauth$ =
+      provider === 'github' ? this.authService.githubAuth(code) : this.authService.googleAuth(code);
+
+    oauth$.subscribe({
+      next: () => {
+        this.router.navigate(['/home']);
+      },
+      error: (err) => {
+        this._error.set(
+          err.error?.message || 'Authentifizierung fehlgeschlagen. Bitte versuchen Sie es erneut.'
+        );
+
+        setTimeout(() => {
+          this.router.navigate(['/']);
+        }, 3000);
+      },
+    });
+  }
+
+  public get error() {
+    return this._error;
+  }
+}

frontend/src/app/feature/auth/recover-password/recover-password.component.ts

@@ -10,7 +10,7 @@ import { AuthService } from '@service/auth.service';
   imports: [CommonModule, ReactiveFormsModule, RouterModule],
   templateUrl: './recover-password.component.html',
 })
-export class RecoverPasswordComponent implements OnInit {
+export default class RecoverPasswordComponent implements OnInit {
   emailForm: FormGroup;
   resetPasswordForm: FormGroup;
   errorMessage = signal('');

frontend/src/app/feature/auth/verify-email/verify-email.component.ts

@@ -7,7 +7,7 @@ import { AuthService } from '@service/auth.service';
   imports: [],
   templateUrl: './verify-email.component.html',
 })
-export class VerifyEmailComponent implements OnInit {
+export default class VerifyEmailComponent implements OnInit {
   route: ActivatedRoute = inject(ActivatedRoute);
   router: Router = inject(Router);
   authService: AuthService = inject(AuthService);

frontend/src/app/feature/game/coinflip/coinflip.component.html

@@ -5,13 +5,11 @@
       @if (gameResult()) {
         <div class="mb-6 text-center result-text">
           <h2 class="text-2xl font-bold mb-2" [class]="getResultClass()">
-            {{ gameResult()?.isWin ? 'You Won!' : 'You Lost' }}
+            {{ gameResult()?.isWin ? 'Du hast gewonnen!' : 'Du hast verloren' }}
           </h2>
           <p class="text-lg">
-            Coin landed on:
-            <span class="font-bold">{{
-              gameResult()?.coinSide === 'HEAD' ? 'HEAD' : 'TAILS'
-            }}</span>
+            Münze zeigt:
+            <span class="font-bold">{{ gameResult()?.coinSide === 'HEAD' ? 'KOPF' : 'ZAHL' }}</span>
           </p>
           @if (gameResult()?.isWin) {
             <p class="text-xl mt-2">
@@ -35,7 +33,7 @@
           <div
             class="front coin-side bg-yellow-500 flex items-center justify-center text-2xl font-bold"
           >
-            <div class="coin-text">HEAD</div>
+            <div class="coin-text">KOPF</div>
           </div>
 
           <!-- Tails side with non-mirrored text -->
@@ -43,7 +41,7 @@
             class="back coin-side bg-gray-700 flex items-center justify-center text-2xl font-bold text-white"
           >
             <!-- Using direct inline transform to counter the mirroring effect -->
-            <span style="display: inline-block; transform: scaleX(1)">TAILS</span>
+            <span style="display: inline-block; transform: scaleX(1)">ZAHL</span>
           </div>
         </div>
       </div>
@@ -56,7 +54,7 @@
           class="button-primary py-3 px-6 relative text-lg"
           [class.opacity-50]="gameInProgress()"
         >
-          Bet TAILS
+          Auf ZAHL setzen
         </button>
         <button
           (click)="betHeads()"
@@ -64,7 +62,7 @@
           class="button-primary py-3 px-6 relative text-lg"
           [class.opacity-50]="gameInProgress()"
         >
-          Bet HEAD
+          Auf KOPF setzen
         </button>
       </div>
     </div>
@@ -72,11 +70,11 @@
     <!-- Game information panel -->
     <div class="col-span-1">
       <div class="card p-4">
-        <h3 class="section-heading text-xl mb-4">Game Information</h3>
+        <h3 class="section-heading text-xl mb-4">Spielinformationen</h3>
         <div class="space-y-4">
           <!-- Current bet display -->
           <div class="flex justify-between items-center">
-            <span class="text-text-secondary">Current Bet:</span>
+            <span class="text-text-secondary">Aktueller Einsatz:</span>
             <span [class]="currentBet() > 0 ? 'text-accent-red' : 'text-text-secondary'">
               <app-animated-number [value]="currentBet()" [duration]="0.5"></app-animated-number> €
             </span>
@@ -84,7 +82,7 @@
 
           <!-- Available balance -->
           <div class="flex justify-between items-center">
-            <span class="text-text-secondary">Your Balance:</span>
+            <span class="text-text-secondary">Dein Guthaben:</span>
             <span class="text-white">
               {{ balance() | currency: 'EUR' }}
             </span>
@@ -103,9 +101,9 @@
           <!-- Custom bet input -->
           <div class="space-y-1">
             <div class="flex justify-between">
-              <label for="bet" class="text-sm text-text-secondary">Bet Amount</label>
+              <label for="bet" class="text-sm text-text-secondary">Einsatzbetrag</label>
               <span *ngIf="isInvalidBet()" class="text-xs text-accent-red animate-pulse"
-                >Cannot exceed balance</span
+                >Darf Guthaben nicht überschreiten</span
               >
             </div>
             <input
@@ -129,11 +127,11 @@
 
           <!-- Rules/info section -->
           <div class="mt-6 pt-4 border-t border-gray-700">
-            <h4 class="text-lg font-semibold mb-2">How to Play</h4>
+            <h4 class="text-lg font-semibold mb-2">Spielregeln</h4>
             <ul class="text-sm text-text-secondary space-y-1">
-              <li>• Choose your bet amount</li>
-              <li>• Select Heads or Tails</li>
-              <li>• Win double your bet if correct</li>
+              <li>• Wähle deinen Einsatzbetrag</li>
+              <li>• Wähle Kopf oder Zahl</li>
+              <li>• Gewinne das Doppelte deines Einsatzes bei richtiger Wahl</li>
             </ul>
           </div>
         </div>

frontend/src/app/feature/game/coinflip/coinflip.component.ts

@@ -44,14 +44,14 @@ export default class CoinflipComponent implements OnInit {
   private coinflipSound?: HTMLAudioElement;
 
   ngOnInit(): void {
-    // Subscribe to user updates for real-time balance changes
+    // Abonniere Benutzerupdates für Echtzeitaktualisierungen des Guthabens
     this.authService.userSubject.subscribe((user) => {
       if (user) {
         this.balance.set(user.balance);
       }
     });
 
-    // Initialize coinflip sound
+    // Initialisiere Münzwurf-Sound
     this.coinflipSound = new Audio('/sounds/coinflip.mp3');
   }
 
@@ -65,26 +65,26 @@ export default class CoinflipComponent implements OnInit {
     const inputElement = event.target as HTMLInputElement;
     let value = Number(inputElement.value);
 
-    // Reset invalid bet state
+    // Setze ungültigen Einsatz-Status zurück
     this.isInvalidBet.set(false);
 
-    // Enforce minimum bet of 1
+    // Erzwinge Mindesteinsatz von 1
     if (value <= 0) {
       value = 1;
     }
 
-    // Cap bet at available balance and show feedback
+    // Begrenze Einsatz auf verfügbares Guthaben und zeige Feedback
     if (value > this.balance()) {
       value = this.balance();
-      // Show visual feedback
+      // Visuelles Feedback anzeigen
       this.isInvalidBet.set(true);
-      // Indicate the error briefly
+      // Zeige den Fehler kurz an
       setTimeout(() => this.isInvalidBet.set(false), 800);
-      // Update the input field directly to show the user the max value
+      // Aktualisiere das Eingabefeld direkt, um dem Benutzer den maximalen Wert anzuzeigen
       inputElement.value = String(value);
     }
 
-    // Update signals
+    // Aktualisiere Signale
     this.betInputValue.set(value);
     this.currentBet.set(value);
   }
@@ -100,34 +100,34 @@ export default class CoinflipComponent implements OnInit {
   private placeBet(side: 'HEAD' | 'TAILS') {
     if (this.gameInProgress() || this.isActionInProgress()) return;
 
-    // Reset previous result
+    // Setze vorheriges Ergebnis zurück
     this.gameResult.set(null);
     this.errorMessage.set('');
 
-    // Set game state
+    // Setze Spielstatus
     this.gameInProgress.set(true);
     this.isActionInProgress.set(true);
 
-    // Play bet sound
+    // Spiele Einsatz-Sound
     this.audioService.playBetSound();
 
-    // Create bet request
+    // Erstelle Einsatz-Anfrage
     const request: CoinflipRequest = {
       betAmount: this.currentBet(),
       coinSide: side,
     };
 
-    // Call API
+    // API aufrufen
     this.http
       .post<CoinflipGame>('/backend/coinflip', request)
       .pipe(
         catchError((error) => {
-          console.error('Error playing coinflip:', error);
+          console.error('Fehler beim Spielen von Coinflip:', error);
 
           if (error.status === 400 && error.error.message.includes('insufficient')) {
-            this.errorMessage.set('Insufficient funds');
+            this.errorMessage.set('Unzureichendes Guthaben');
           } else {
-            this.errorMessage.set('An error occurred. Please try again.');
+            this.errorMessage.set('Ein Fehler ist aufgetreten. Bitte versuche es erneut.');
           }
 
           this.gameInProgress.set(false);
@@ -140,37 +140,37 @@ export default class CoinflipComponent implements OnInit {
       .subscribe((result) => {
         if (!result) return;
 
-        console.log('API response:', result);
+        console.log('API-Antwort:', result);
 
-        // Fix potential property naming inconsistency from the backend
+        // Behebe mögliche Inkonsistenzen bei der Eigenschaftenbenennung vom Backend
         const fixedResult: CoinflipGame = {
           isWin: result.isWin ?? result.win,
           payout: result.payout,
           coinSide: result.coinSide,
         };
 
-        console.log('Fixed result:', fixedResult);
+        console.log('Korrigiertes Ergebnis:', fixedResult);
 
-        // Play coin flip animation and sound
+        // Spiele Münzwurf-Animation und -Sound
         this.playCoinFlipAnimation(fixedResult.coinSide);
 
-        // Set result after animation completes
+        // Setze Ergebnis nach Abschluss der Animation
         setTimeout(() => {
           this.gameResult.set(fixedResult);
 
-          // Update balance with new value from auth service
+          // Aktualisiere Guthaben mit neuem Wert vom Auth-Service
           this.authService.loadCurrentUser();
 
-          // Play win sound if player won
+          // Spiele Gewinn-Sound, wenn der Spieler gewonnen hat
           if (fixedResult.isWin) {
             this.audioService.playWinSound();
           }
 
-          // Reset game state after showing result
+          // Setze Spielstatus nach Anzeigen des Ergebnisses zurück
           setTimeout(() => {
             this.gameInProgress.set(false);
           }, 1500);
-        }, 1100); // Just after animation ends
+        }, 1100); // Kurz nach Ende der Animation
       });
   }
 
@@ -179,48 +179,50 @@ export default class CoinflipComponent implements OnInit {
 
     const coinEl = this.coinElement.nativeElement;
 
-    // Reset any existing animations
+    // Setze bestehende Animationen zurück
     coinEl.classList.remove('animate-to-heads', 'animate-to-tails');
 
-    // Reset any inline styles from previous animations
+    // Setze alle Inline-Styles von vorherigen Animationen zurück
     coinEl.style.transform = '';
 
-    // Force a reflow to restart animation
+    // Erzwinge Reflow, um Animation neu zu starten
     void coinEl.offsetWidth;
 
-    // Play flip sound
+    // Spiele Münzwurf-Sound
     if (this.coinflipSound) {
       this.coinflipSound.currentTime = 0;
-      this.coinflipSound.play().catch((err) => console.error('Error playing sound:', err));
+      this.coinflipSound
+        .play()
+        .catch((err) => console.error('Fehler beim Abspielen des Sounds:', err));
     }
 
-    // Add appropriate animation class based on result
+    // Füge passende Animationsklasse basierend auf dem Ergebnis hinzu
     if (result === 'HEAD') {
       coinEl.classList.add('animate-to-heads');
     } else {
       coinEl.classList.add('animate-to-tails');
     }
 
-    console.log(`Animation applied for result: ${result}`);
+    console.log(`Animation angewendet für Ergebnis: ${result}`);
   }
 
   /**
-   * Validates input as the user types to prevent invalid values
+   * Validiert Eingabe während der Benutzer tippt, um ungültige Werte zu verhindern
    */
   validateBetInput(event: KeyboardEvent) {
-    // Allow navigation keys (arrows, delete, backspace, tab)
+    // Erlaube Navigationstasten (Pfeile, Entf, Rücktaste, Tab)
     const navigationKeys = ['ArrowLeft', 'ArrowRight', 'Delete', 'Backspace', 'Tab'];
     if (navigationKeys.includes(event.key)) {
       return;
     }
 
-    // Only allow numbers
+    // Erlaube nur Zahlen
     if (!/^\d$/.test(event.key)) {
       event.preventDefault();
       return;
     }
 
-    // Get the value that would result after the keypress
+    // Ermittle den Wert, der nach dem Tastendruck entstehen würde
     const input = event.target as HTMLInputElement;
     const currentValue = input.value;
     const cursorPosition = input.selectionStart || 0;
@@ -230,14 +232,14 @@ export default class CoinflipComponent implements OnInit {
       currentValue.substring(input.selectionEnd || cursorPosition);
     const numValue = Number(newValue);
 
-    // Prevent values greater than balance
+    // Verhindere Werte, die größer als das Guthaben sind
     if (numValue > this.balance()) {
       event.preventDefault();
     }
   }
 
-  // We removed the paste handler for simplicity since the updateBet method
-  // will handle any value that gets into the input field
+  // Der Paste-Handler wurde der Einfachheit halber entfernt, da die updateBet-Methode
+  // jeden Wert behandelt, der in das Eingabefeld gelangt
 
   getResultClass() {
     if (!this.gameResult()) return '';

frontend/src/app/feature/game/dice/dice.component.ts

@@ -27,7 +27,7 @@ type DiceFormGroup = FormGroup<{
   imports: [CommonModule, ReactiveFormsModule, PlaySoundDirective, DragSoundDirective],
   templateUrl: './dice.component.html',
 })
-export class DiceComponent implements OnInit {
+export default class DiceComponent implements OnInit {
   private readonly formBuilder = inject(FormBuilder);
   private readonly diceService = inject(DiceService);
   private readonly userService = inject(UserService);

frontend/src/app/feature/landing/landing.component.ts

@@ -11,7 +11,8 @@ import { ActivatedRoute, RouterLink } from '@angular/router';
 import { AuthService } from '@service/auth.service';
 import { LoginComponent } from '../auth/login/login.component';
 import { RegisterComponent } from '../auth/register/register.component';
-import { RecoverPasswordComponent } from '../auth/recover-password/recover-password.component';
+import '../auth/recover-password/recover-password.component';
+import RecoverPasswordComponent from '../auth/recover-password/recover-password.component';
 
 @Component({
   selector: 'app-landing-page',

frontend/src/app/service/auth.service.ts

@@ -79,6 +79,15 @@ export class AuthService {
     );
   }
 
+  googleAuth(code: string): Observable<AuthResponse> {
+    return this.http.post<AuthResponse>(`${this.oauthUrl}/google/callback`, { code }).pipe(
+      tap((response) => {
+        this.setToken(response.token);
+        this.loadCurrentUser();
+      })
+    );
+  }
+
   logout(): void {
     localStorage.removeItem(TOKEN_KEY);
     localStorage.removeItem(USER_KEY);