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feat: 카카오 로그인 구현 #23 
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+160
-7
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5 files changed

+160
-7
lines changed

‎src/main/java/org/dfbf/soundlink/domain/user/controller/AuthController.java‎

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@@ -4,22 +4,21 @@
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import io.swagger.v3.oas.annotations.tags.Tag;
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import jakarta.servlet.http.HttpServletRequest;
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import jakarta.servlet.http.HttpServletResponse;
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import lombok.AllArgsConstructor;
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import lombok.RequiredArgsConstructor;
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import org.dfbf.soundlink.domain.user.dto.request.LoginReqDto;
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import org.dfbf.soundlink.domain.user.service.KakaoAuthService;
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import org.dfbf.soundlink.domain.user.service.UserService;
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import org.dfbf.soundlink.global.exception.ResponseResult;
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import org.springframework.web.bind.annotation.PostMapping;
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import org.springframework.web.bind.annotation.RequestBody;
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import org.springframework.web.bind.annotation.RequestMapping;
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import org.springframework.web.bind.annotation.RestController;
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import org.springframework.web.bind.annotation.*;
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@RestController
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@AllArgsConstructor
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@RequiredArgsConstructor
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@Tag(name = "Auth API", description = "인증 관련 API")
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@RequestMapping("/api/auth")
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public class AuthController {
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private final UserService userService;
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private final KakaoAuthService kakaoAuthService;
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@PostMapping("/login")
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@Operation(summary = "로그인", description = "로그인 API")
@@ -38,4 +37,11 @@ public ResponseResult logout(HttpServletResponse response, HttpServletRequest re
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public ResponseResult reissueToken(HttpServletRequest request, HttpServletResponse response){
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return userService.reissueToken(request, response);
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}
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// 카카오 로그인 (인가 코드 받아서 회원가입 또는 로그인 진행)
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@Operation(summary = "카카오 로그인", description = "카카오 로그인 후 JWT 발급")
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@GetMapping("/login/kakao")
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public ResponseResult kakaoCallback(@RequestParam String code) {
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return kakaoAuthService.kakaoLogin(code);
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}
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}

‎src/main/java/org/dfbf/soundlink/domain/user/dto/response/KakaoTokenResponseDTO.java‎

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@@ -0,0 +1,11 @@
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package org.dfbf.soundlink.domain.user.dto.response;
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public record KakaoTokenResponseDTO(
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String token_type,
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String access_token,
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String refresh_token,
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int expires_in,
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int refresh_token_expires_in,
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String scope
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) {
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}

‎src/main/java/org/dfbf/soundlink/domain/user/dto/response/KakaoUserDTO.java‎

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package org.dfbf.soundlink.domain.user.dto.response;
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public record KakaoUserDTO(
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String id, // id는 Long 타입이지만, 안전성을 위해 String으로 처리
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KakaoAccount kakao_account
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) {
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public record KakaoAccount(
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String email,
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String nickname
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) {
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}
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}

‎src/main/java/org/dfbf/soundlink/domain/user/repository/UserRepository.java‎

Lines changed: 2 additions & 1 deletion
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@@ -2,7 +2,6 @@
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import org.dfbf.soundlink.domain.user.entity.User;
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import org.dfbf.soundlink.domain.user.repository.dsl.UserRepositoryCustom;
5-
import org.springframework.cache.annotation.CachePut;
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import org.springframework.data.jpa.repository.JpaRepository;
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import java.util.Optional;
@@ -15,4 +14,6 @@ public interface UserRepository extends JpaRepository<User, Long>, UserRepositor
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boolean existsByLoginId(String loginId);
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Optional<User> findByLoginId(String loginId);
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Optional<User> findBySocialId(Long socialId);
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}

‎src/main/java/org/dfbf/soundlink/domain/user/service/KakaoAuthService.java‎

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package org.dfbf.soundlink.domain.user.service;
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import lombok.RequiredArgsConstructor;
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import org.dfbf.soundlink.domain.user.dto.response.KakaoTokenResponseDTO;
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import org.dfbf.soundlink.domain.user.dto.response.KakaoUserDTO;
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import org.dfbf.soundlink.domain.user.entity.User;
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import org.dfbf.soundlink.domain.user.repository.UserRepository;
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import org.dfbf.soundlink.global.auth.JwtProvider;
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import org.dfbf.soundlink.global.auth.client.KakaoAuthClient;
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import org.dfbf.soundlink.global.auth.client.KakaoUserClient;
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import org.dfbf.soundlink.global.comm.enums.SocialType;
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import org.dfbf.soundlink.global.exception.ResponseResult;
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import org.springframework.beans.factory.annotation.Value;
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import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
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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 java.util.Map;
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import java.util.Optional;
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@Service
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@RequiredArgsConstructor
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public class KakaoAuthService {
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private final KakaoAuthClient kakaoAuthClient;
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private final KakaoUserClient kakaoUserClient;
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private final UserRepository userRepository;
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private final JwtProvider jwtProvider;
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private final BCryptPasswordEncoder passwordEncoder;
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private final TokenService tokenService;
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@Value("${kakao.client-id}")
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private String clientId;
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@Value("${kakao.redirect-uri}")
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private String redirectUri;
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/**
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* 카카오 로그인 및 JWT 발급
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*/
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public ResponseResult kakaoLogin(String code) {
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// 요청 파라미터 설정 (JSONObject 대신 하나의 Key와 하나 이상의 value로 이루어진 리스트를 쌍으로 받기 위해 LinkedMultiValueMap 사용)
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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("redirect_uri", redirectUri);
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params.add("code", code);
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// 카카오 토큰 정보 요청
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KakaoTokenResponseDTO tokenResponse = kakaoAuthClient.getAccessToken(params);
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String accessToken = tokenResponse.access_token();
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// 카카오 사용자 정보 요청
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KakaoUserDTO kakaoUser = kakaoUserClient.getUserInfo("Bearer " + accessToken);
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String kakaoNickname = kakaoUser.kakao_account().nickname(); // 닉네임
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// DB에서 사용자 조회
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Optional<User> existingUser = userRepository.findBySocialId(Long.valueOf(kakaoUser.id()));
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if (existingUser.isPresent()) {
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// 기존 사용자가 존재 시, 로그인 처리
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return generateTokenResponse(existingUser.get());
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} else {
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// 신규 가입은 닉네임 중복 확인 필요
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if (userRepository.existsByNickname(kakaoNickname)) {
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// 기존 닉네임이 중복 시, 새로운 임의의 닉네임 생성
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kakaoNickname = generateUniqueNickname(kakaoNickname);
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}
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// 회원가입
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User newUser = registerNewKakaoUser(kakaoUser, kakaoNickname);
72+
return generateTokenResponse(newUser);
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}
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}
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/**
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* JWT 토큰 생성
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*/
79+
private ResponseResult generateTokenResponse(User user) {
80+
String jwtAccessToken = jwtProvider.createAccessToken(user.getUserId());
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String jwtRefreshToken = jwtProvider.createRefreshToken(user.getUserId());
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tokenService.updateRefreshToken(user.getUserId(), jwtRefreshToken);
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Map<String, String> authResponse = Map.of(
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"accessToken", jwtAccessToken,
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"refreshToken", jwtRefreshToken
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);
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return new ResponseResult(authResponse);
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}
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/**
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* 새로운 카카오 사용자 회원가입
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*/
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private User registerNewKakaoUser(KakaoUserDTO kakaoUser, String nickname) {
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User newUser = User.builder()
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.nickName(nickname)
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.socialId(Long.valueOf(kakaoUser.id()))
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.socialType(SocialType.KAKAO)
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.loginId("kakao_" + kakaoUser.id()) // 카카오 ID 기반 로그인 ID 생성
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.password(passwordEncoder.encode("kakao_password")) // 비밀번호는 임의 값 (카카오 로그인이므로 필요 없음)
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.email(kakaoUser.kakao_account().email())
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.build();
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return userRepository.save(newUser);
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}
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/**
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* 닉네임이 중복될 경우 새로운 닉네임 생성
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*/
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private String generateUniqueNickname(String baseNickname) {
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int suffix = 1;
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String newNickname = baseNickname;
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// 닉네임이 중복되지 않을 때까지 반복
117+
while (userRepository.existsByNickname(newNickname)) {
118+
newNickname = baseNickname + "_" + suffix;
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suffix++;
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}
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return newNickname;
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}
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}

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