feat: 소셜 로그인 실패 handler 추가

src/main/java/org/sophy/sophy/config/auth/SecurityConfig.java

@@ -4,6 +4,7 @@
 import java.util.List;
 import lombok.RequiredArgsConstructor;
 import org.sophy.sophy.config.auth.common.CustomOAuth2UserService;
+import org.sophy.sophy.config.auth.common.OAuth2LoginFailureHandler;
 import org.sophy.sophy.config.auth.common.OAuth2LoginSuccessHandler;
 import org.sophy.sophy.jwt.JwtAccessDeniedHandler;
 import org.sophy.sophy.jwt.JwtAuthenticationEntryPoint;
@@ -36,6 +37,7 @@ public class SecurityConfig {
     private final RedisTemplate redisTemplate;
     private final CustomOAuth2UserService customOAuth2UserService;
     private final OAuth2LoginSuccessHandler oAuth2LoginSuccessHandler;
+    private final OAuth2LoginFailureHandler oAuth2LoginFailureHandler;
 
     @Bean
     public PasswordEncoder passwordEncoder() {
@@ -76,6 +78,7 @@ public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
 
         http.oauth2Login()
             .successHandler(oAuth2LoginSuccessHandler) // 동의하고 계속하기를 눌렀을 때 Handler 설정
+            .failureHandler(oAuth2LoginFailureHandler) // 소셜 로그인 실패 시 핸들러 설정
             .userInfoEndpoint().userService(customOAuth2UserService) // customUserService 설정
             .and()
             .permitAll();

src/main/java/org/sophy/sophy/config/auth/common/OAuth2LoginFailureHandler.java

@@ -0,0 +1,23 @@
+package org.sophy.sophy.config.auth.common;
+
+import java.io.IOException;
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.security.core.AuthenticationException;
+import org.springframework.security.web.authentication.AuthenticationFailureHandler;
+import org.springframework.stereotype.Component;
+
+@Slf4j
+@Component
+public class OAuth2LoginFailureHandler implements AuthenticationFailureHandler {
+
+    @Override
+    public void onAuthenticationFailure(HttpServletRequest request, HttpServletResponse response,
+        AuthenticationException exception) throws IOException, ServletException {
+        response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
+        response.getWriter().write("소셜 로그인이 실패하였습니다.");
+        log.error("소셜 로그인에 실패했습니다. 에러메세지 : {}", exception.getMessage());
+    }
+}