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feat: 카카오 소셜 로그인 구현
1 parent 2696912 commit dc3a59e

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‎src/main/java/com/back/web7_9_codecrete_be/domain/auth/controller/AuthController.java‎

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@@ -90,4 +90,18 @@ public RsData<?> refresh() {
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String newAccessToken = tokenService.reissueAccessToken();
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return RsData.success("토큰 재발급 완료", newAccessToken);
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}
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@Operation(summary = "카카오 소셜 로그인", description = "카카오 OAuth 인가 코드를 이용해 로그인/회원가입을 진행합니다.")
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@GetMapping("/login/kakao")
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public RsData<?> kakaoLogin(@RequestParam String code) {
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LoginResponse response = authService.kakaoLogin(code);
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return RsData.success("카카오 로그인 성공", response);
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}
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@Operation(summary = "구글 소셜 로그인", description = "구글 OAuth 인가 코드를 이용해 로그인/회원가입을 진행합니다.")
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@GetMapping("/login/google")
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public RsData<?> googleLogin(@RequestParam String code) {
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LoginResponse response = authService.googleLogin(code);
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return RsData.success("구글 로그인 성공", response);
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}
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}

‎src/main/java/com/back/web7_9_codecrete_be/domain/auth/service/AuthService.java‎

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@@ -1,9 +1,11 @@
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package com.back.web7_9_codecrete_be.domain.auth.service;
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import com.back.web7_9_codecrete_be.domain.auth.dto.kakao.KakaoUserInfo;
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import com.back.web7_9_codecrete_be.domain.auth.dto.request.LoginRequest;
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import com.back.web7_9_codecrete_be.domain.auth.dto.request.SignupRequest;
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import com.back.web7_9_codecrete_be.domain.auth.dto.response.LoginResponse;
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import com.back.web7_9_codecrete_be.domain.email.service.EmailService;
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import com.back.web7_9_codecrete_be.domain.users.entity.SocialType;
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import com.back.web7_9_codecrete_be.domain.users.entity.User;
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import com.back.web7_9_codecrete_be.domain.users.repository.UserRepository;
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import com.back.web7_9_codecrete_be.global.error.code.AuthErrorCode;
@@ -25,6 +27,7 @@ public class AuthService {
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private final PasswordEncoder passwordEncoder;
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private final EmailService emailService;
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private final TokenService tokenService;
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private final KakaoOAuthService kakaoOAuthService;
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// 회원가입
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public void signUp(SignupRequest req) {
@@ -50,6 +53,8 @@ public void signUp(SignupRequest req) {
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.password(passwordEncoder.encode(req.getPassword()))
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.birth(LocalDate.parse(req.getBirth()))
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.profileImage(req.getProfileImage())
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.socialType(SocialType.LOCAL)
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.socialId(null)
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.build();
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userRepository.save(user);
@@ -66,6 +71,10 @@ public LoginResponse login(LoginRequest req) {
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throw new BusinessException(UserErrorCode.USER_DELETED);
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}
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if (user.getSocialType() != SocialType.LOCAL) {
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throw new BusinessException(AuthErrorCode.SOCIAL_USER_CANNOT_LOGIN);
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}
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if (!passwordEncoder.matches(req.getPassword(), user.getPassword())) {
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throw new BusinessException(AuthErrorCode.INVALID_PASSWORD);
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}
@@ -119,4 +128,61 @@ private String generateTempPassword() {
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}
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return sb.toString();
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}
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@Transactional
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public LoginResponse kakaoLogin(String code) {
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// 1. 인가 코드 → 카카오 Access Token
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String kakaoAccessToken = kakaoOAuthService.getAccessToken(code);
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// 2. Access Token → 사용자 정보
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KakaoUserInfo kakaoUserInfo = kakaoOAuthService.getUserInfo(kakaoAccessToken);
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if (kakaoUserInfo.getEmail() == null) {
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throw new BusinessException(AuthErrorCode.SOCIAL_EMAIL_NOT_PROVIDED);
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}
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// 3. 소셜 ID 기준 사용자 조회
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User user = userRepository
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.findBySocialTypeAndSocialId(
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SocialType.KAKAO,
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kakaoUserInfo.getSocialId()
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)
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.orElseGet(() -> registerKakaoUser(kakaoUserInfo));
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// 4. 탈퇴 사용자 체크
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if (user.getIsDeleted()) {
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throw new BusinessException(UserErrorCode.USER_DELETED);
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}
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// 5. 토큰 발급
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tokenService.issueTokens(user);
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return new LoginResponse(user.getId(), user.getNickname());
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}
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private User registerKakaoUser(KakaoUserInfo info) {
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String nickname = info.getNickname();
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if (userRepository.existsByNickname(nickname)) {
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nickname = nickname + "_" + System.currentTimeMillis();
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}
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User user = User.builder()
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.email(info.getEmail())
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.nickname(nickname)
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.password(null)
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.birth(null)
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.profileImage(info.getProfileImageUrl())
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.socialType(SocialType.KAKAO)
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.socialId(info.getSocialId())
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.build();
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return userRepository.save(user);
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}
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public LoginResponse googleLogin(String code) {
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// TODO: 구글 인가 코드 → 사용자 정보 → 로그인 처리
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throw new UnsupportedOperationException("구글 로그인 미구현");
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}
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}

‎src/main/java/com/back/web7_9_codecrete_be/domain/auth/service/KakaoOAuthService.java‎

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@@ -0,0 +1,74 @@
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package com.back.web7_9_codecrete_be.domain.auth.service;
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import com.back.web7_9_codecrete_be.domain.auth.dto.kakao.KakaoTokenResponse;
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import com.back.web7_9_codecrete_be.domain.auth.dto.kakao.KakaoUserInfo;
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import com.back.web7_9_codecrete_be.domain.auth.dto.kakao.KakaoUserResponse;
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import lombok.RequiredArgsConstructor;
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import org.springframework.beans.factory.annotation.Value;
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import org.springframework.http.*;
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import org.springframework.stereotype.Service;
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import org.springframework.util.LinkedMultiValueMap;
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import org.springframework.util.MultiValueMap;
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import org.springframework.web.client.RestTemplate;
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@Service
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@RequiredArgsConstructor
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public class KakaoOAuthService {
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@Value("${oauth.kakao.client-id}")
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private String clientId;
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@Value("${oauth.kakao.redirect-uri}")
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private String redirectUri;
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@Value("${oauth.kakao.client-secret}")
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private String clientSecret;
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private static final String TOKEN_URL = "https://kauth.kakao.com/oauth/token";
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private static final String USER_INFO_URL = "https://kapi.kakao.com/v2/user/me";
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private final RestTemplate restTemplate = new RestTemplate();
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// 인가 코드 → 액세스 토큰
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public String getAccessToken(String code) {
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HttpHeaders headers = new HttpHeaders();
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headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
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MultiValueMap<String, String> params = new LinkedMultiValueMap<>();
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params.add("grant_type", "authorization_code");
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params.add("client_id", clientId);
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params.add("client_secret", clientSecret);
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params.add("redirect_uri", redirectUri);
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params.add("code", code);
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HttpEntity<MultiValueMap<String, String>> request =
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new HttpEntity<>(params, headers);
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ResponseEntity<KakaoTokenResponse> response =
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restTemplate.postForEntity(
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TOKEN_URL,
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request,
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KakaoTokenResponse.class
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);
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return response.getBody().getAccessToken();
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}
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// 인가 코드 → 카카오 사용자 정보
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public KakaoUserInfo getUserInfo(String accessToken) {
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HttpHeaders headers = new HttpHeaders();
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headers.setBearerAuth(accessToken);
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HttpEntity<Void> request = new HttpEntity<>(headers);
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ResponseEntity<KakaoUserResponse> response =
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restTemplate.exchange(
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USER_INFO_URL,
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HttpMethod.GET,
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request,
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KakaoUserResponse.class
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);
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return response.getBody().toUserInfo();
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}
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}

‎src/main/java/com/back/web7_9_codecrete_be/global/error/code/AuthErrorCode.java‎

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@@ -17,6 +17,8 @@ public enum AuthErrorCode implements ErrorCode {
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USER_NOT_FOUND(HttpStatus.NOT_FOUND, "A-110", "존재하지 않는 이메일입니다."),
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INVALID_PASSWORD(HttpStatus.UNAUTHORIZED, "A-111", "비밀번호가 일치하지 않습니다."),
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USER_INACTIVE(HttpStatus.FORBIDDEN, "A-112", "현재 비활성화된 계정입니다."),
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SOCIAL_USER_CANNOT_LOGIN(HttpStatus.BAD_REQUEST, "A-113", "소셜 로그인 계정은 일반 로그인으로 로그인할 수 없습니다."),
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SOCIAL_EMAIL_NOT_PROVIDED(HttpStatus.BAD_REQUEST, "A-114", "소셜 계정에서 이메일 정보를 제공하지 않았습니다."),
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// 권한 관련
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UNAUTHORIZED_USER(HttpStatus.UNAUTHORIZED, "A-120", "로그인이 필요합니다."),

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