UPDATE OAuth2 user service to handle user creation and redirect after login

src/main/java/com/ddf/vodsystem/configuration/CustomOAuth2UserService.java

@@ -0,0 +1,47 @@
+package com.ddf.vodsystem.configuration;
+import com.ddf.vodsystem.entities.User;
+import com.ddf.vodsystem.repositories.UserRepository;
+
+import org.springframework.security.oauth2.client.userinfo.DefaultOAuth2UserService;
+import org.springframework.security.oauth2.client.userinfo.OAuth2UserRequest;
+import org.springframework.security.oauth2.core.OAuth2AuthenticationException;
+import org.springframework.security.oauth2.core.user.OAuth2User;
+import org.springframework.stereotype.Service;
+
+import java.time.LocalDateTime;
+import java.util.Optional;
+
+
+@Service
+public class CustomOAuth2UserService extends DefaultOAuth2UserService  {
+
+    private final UserRepository userRepository;
+
+    public CustomOAuth2UserService(UserRepository userRepository) {
+        this.userRepository = userRepository;
+    }
+
+    @Override
+    public OAuth2User loadUser(OAuth2UserRequest userRequest) throws OAuth2AuthenticationException {
+        OAuth2User oAuth2User = super.loadUser(userRequest);
+
+        String email = oAuth2User.getAttribute("email");
+        String name = oAuth2User.getAttribute("name");
+        String googleId = oAuth2User.getAttribute("sub");
+
+        Optional<User> existingUser = userRepository.findByGoogleId(googleId);
+
+        if (existingUser.isEmpty()) {
+            User user = new User();
+            user.setEmail(email);
+            user.setName(name);
+            user.setGoogleId(googleId);
+            user.setUsername(email);
+            user.setRole(0);
+            user.setCreatedAt(LocalDateTime.now());
+            userRepository.save(user);
+        }
+
+        return oAuth2User;
+    }
+}

src/main/java/com/ddf/vodsystem/configuration/SecurityConfig.java

@@ -0,0 +1,49 @@
+package com.ddf.vodsystem.configuration;
+
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.security.config.annotation.web.builders.HttpSecurity;
+import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
+import org.springframework.security.config.annotation.web.configurers.AbstractHttpConfigurer;
+import org.springframework.security.web.SecurityFilterChain;
+import org.springframework.security.web.authentication.AuthenticationSuccessHandler;
+
+@Configuration
+@EnableWebSecurity
+public class SecurityConfig {
+
+    private final CustomOAuth2UserService customOAuth2UserService;
+
+    @Value("${frontend.url}")
+    private String frontendUrl;
+
+    public SecurityConfig(CustomOAuth2UserService customOAuth2UserService) {
+        this.customOAuth2UserService = customOAuth2UserService;
+    }
+
+    @Bean
+    public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
+        http
+                .csrf(AbstractHttpConfigurer::disable)
+                .authorizeHttpRequests(auth -> auth
+                        .requestMatchers("/api/v1/auth/login", "/api/v1/auth/user").permitAll()
+                        .anyRequest().authenticated()
+                )
+                .oauth2Login(oauth2 -> oauth2
+                        .userInfoEndpoint(userInfo -> userInfo
+                                .userService(customOAuth2UserService)
+                        )
+                        .successHandler(successHandler())
+
+                );
+
+        return http.build();
+    }
+
+    @Bean
+    public AuthenticationSuccessHandler successHandler() {
+        return (request, response, authentication) -> response.sendRedirect(frontendUrl);
+    }
+
+}