ITDS-25 refactor: 소셜 로그인 Factory Pattern 적용

src/main/java/com/dissonance/itit/factory/OAuthServiceFactory.java

@@ -0,0 +1,33 @@
+package com.dissonance.itit.factory;
+
+import java.util.List;
+import java.util.Map;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+import com.dissonance.itit.common.exception.CustomException;
+import com.dissonance.itit.common.exception.ErrorCode;
+import com.dissonance.itit.domain.enums.SocialLoginProvider;
+import com.dissonance.itit.service.OAuthService;
+
+@Component
+public class OAuthServiceFactory {
+	private final Map<SocialLoginProvider, OAuthService> oAuthServices;
+
+	@Autowired
+	public OAuthServiceFactory(List<OAuthService> oAuthServiceList) {
+		oAuthServices = oAuthServiceList.stream()
+			.collect(Collectors.toMap(OAuthService::getProvider, Function.identity()));
+	}
+
+	public OAuthService getOAuthService(SocialLoginProvider provider) {
+		OAuthService service = oAuthServices.get(provider);
+		if (service == null) {
+			throw new CustomException(ErrorCode.INVALID_PROVIDER);
+		}
+		return service;
+	}
+}

src/main/java/com/dissonance/itit/service/KakaoOAuthServiceImpl.java

@@ -0,0 +1,54 @@
+package com.dissonance.itit.service;
+
+import org.springframework.http.ResponseEntity;
+import org.springframework.stereotype.Service;
+
+import com.dissonance.itit.client.KakaoInformationFeignClient;
+import com.dissonance.itit.domain.enums.SocialLoginProvider;
+import com.dissonance.itit.dto.response.KakaoUserInformation;
+import com.dissonance.itit.dto.response.OAuthUserInformation;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+
+@Slf4j
+@RequiredArgsConstructor
+@Service
+public class KakaoOAuthServiceImpl implements OAuthService {
+	private static final String TOKEN_PREFIX = "Bearer ";
+	private final KakaoInformationFeignClient kakaoInformationFeignClient;
+	private final ObjectMapper objectMapper = new ObjectMapper();
+
+	@Override
+	public SocialLoginProvider getProvider() {
+		return SocialLoginProvider.KAKAO;
+	}
+
+	@Override
+	public OAuthUserInformation requestUserInformation(String token) {
+		log.info("Requesting user information with token: {}", token);
+
+		// Feign Client 호출
+		ResponseEntity<String> responseEntity = kakaoInformationFeignClient.call(
+			"application/x-www-form-urlencoded;charset=utf-8",
+			TOKEN_PREFIX + token
+		);
+
+		// 원본 JSON 응답을 로그에 출력
+		String jsonResponse = responseEntity.getBody();
+		log.info("Raw JSON response: {}", jsonResponse);
+
+		// JSON 응답을 KakaoUserInformation 객체로 변환
+		KakaoUserInformation userInformation = null;
+		try {
+			userInformation = objectMapper.readValue(jsonResponse, KakaoUserInformation.class);
+		} catch (JsonProcessingException e) {
+			log.error("Error parsing JSON response", e);
+		}
+
+		log.info("Parsed user information: {}", userInformation);
+		return userInformation;
+	}
+}

src/main/java/com/dissonance/itit/service/OAuthService.java

@@ -0,0 +1,10 @@
+package com.dissonance.itit.service;
+
+import com.dissonance.itit.domain.enums.SocialLoginProvider;
+import com.dissonance.itit.dto.response.OAuthUserInformation;
+
+public interface OAuthService {
+	SocialLoginProvider getProvider();
+
+	OAuthUserInformation requestUserInformation(String token);
+}

src/main/java/com/dissonance/itit/service/UserService.java

@@ -12,6 +12,7 @@
 import com.dissonance.itit.dto.response.GeneratedToken;
 import com.dissonance.itit.dto.response.LoginUserInfoRes;
 import com.dissonance.itit.dto.response.OAuthUserInformation;
+import com.dissonance.itit.factory.OAuthServiceFactory;
 import com.dissonance.itit.repository.UserRepository;
 
 import lombok.RequiredArgsConstructor;
@@ -24,33 +25,22 @@ public class UserService {
 	private final JwtUtil jwtUtil;
 	private final UserRepository userRepository;
 
-	private final KakaoOAuthServiceImpl kakaoOAuthService;
-	private final AppleOAuthServiceImpl appleOAuthService;
+	private final OAuthServiceFactory oAuthServiceFactory;
 
 	@Transactional
 	public GeneratedToken login(String provider, String token) {
-		OAuthUserInformation userInformation;
 		SocialLoginProvider providerEnum = SocialLoginProvider.valueOf(provider.toUpperCase());
+		OAuthService oAuthService = oAuthServiceFactory.getOAuthService(providerEnum);
 
-		if (providerEnum.equals(SocialLoginProvider.APPLE)) {
-			userInformation = appleOAuthService.requestUserInformation(token);
-		} else if (providerEnum.equals(SocialLoginProvider.KAKAO)) {
-			userInformation = kakaoOAuthService.requestUserInformation(token);
-		} else {
-			log.info("존재하지 않는 provider: " + provider);
-			throw new CustomException(ErrorCode.INVALID_PROVIDER);
-		}
+		OAuthUserInformation userInformation = oAuthService.requestUserInformation(token);
 
 		User user;
 
 		if (isExistsByProviderAndProviderId(providerEnum, userInformation.getProviderId())) {
 			log.info("[UserService] login, response: {}", userInformation);
-
 			user = findByEmail(userInformation.getEmail());
-
 		} else {
 			log.info("[UserService] signUp, response: {}", userInformation);
-
 			user = saveUser(userInformation);
 		}