[#2]✨Feat: 소셜로그인 Success Handler 작성

src/main/java/univ/yesummit/global/oauth/OAuth2SuccessHandler.java

@@ -0,0 +1,47 @@
+package univ.yesummit.global.oauth;
+
+import jakarta.servlet.ServletException;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.security.core.Authentication;
+import org.springframework.security.web.authentication.AuthenticationSuccessHandler;
+import org.springframework.stereotype.Component;
+import univ.yesummit.domain.member.service.MemberService;
+import univ.yesummit.global.auth.util.JwtUtils;
+
+import java.io.IOException;
+
+@Slf4j
+@Component
+@RequiredArgsConstructor
+public class OAuth2SuccessHandler implements AuthenticationSuccessHandler {
+
+    private final JwtUtils jwtUtils;
+    private final MemberService memberService;
+
+    @Override
+    public void onAuthenticationSuccess(HttpServletRequest request, HttpServletResponse response, Authentication authentication) throws IOException, ServletException {
+        log.info("OAuth2SuccessHandler.onAuthenticationSuccess Member Name : {}", authentication.getName());
+
+        OAuth2Member oAuth2Member = (OAuth2Member) authentication.getPrincipal();
+        Long memberId = oAuth2Member.getMemberId();
+
+        // JWT 토큰 발급
+        String accessToken = jwtUtils.createAccessToken(memberId);
+        String refreshToken = jwtUtils.createRefreshToken();
+        jwtUtils.sendAccessAndRefreshToken(response, accessToken, refreshToken);
+
+        // 기존 회원인지 확인
+        // 기존 회원인지 확인
+        if (memberService.isFirstLogin(memberId)) {
+            // 첫 로그인 시 추가 정보 입력 페이지로 리다이렉트
+            response.sendRedirect("/additional-info");
+            return;
+        }
+
+        // 기존 회원이라면 정상 응답 (e.g., 메인 페이지로 리다이렉트)
+        response.sendRedirect("/home");
+    }
+}