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Merge pull request #51 from prgrms-web-devcourse-final-project/feat/kakaoLogin/main
카카오 로그인 기능
2 parents a95bfe2 + a98eb89 commit 5b98aca

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+287
-11
lines changed

12 files changed

+287
-11
lines changed

‎src/main/java/org/dfbf/soundlink/SoundLinkJavaApplication.java‎

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package org.dfbf.soundlink;
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import org.dfbf.soundlink.global.config.FeignConfig;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import org.springframework.boot.autoconfigure.security.servlet.SecurityAutoConfiguration;
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import org.springframework.cache.annotation.EnableCaching;
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import org.springframework.cloud.openfeign.EnableFeignClients;
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@EnableFeignClients(basePackages = "org.dfbf.soundlink.global.auth.client", defaultConfiguration = FeignConfig.class)
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@SpringBootApplication(exclude= SecurityAutoConfiguration.class)
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@EnableCaching
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public class SoundLinkJavaApplication {

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

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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, HttpServletResponse response) {
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return kakaoAuthService.kakaoLogin(code, response);
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}
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}

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

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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

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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;
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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 jakarta.servlet.http.HttpServletResponse;
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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.http.ResponseCookie;
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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.HashMap;
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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 static final String domain = "";
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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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@Value("${REFRESH_TOKEN_EXPIRATION_TIME}")
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private int REFRESH_TOKEN_EXPIRATION_TIME;
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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, HttpServletResponse response) {
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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);
58+
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(), response);
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} else {
71+
// 신규 가입은 닉네임 중복 확인 필요
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if (userRepository.existsByNickname(kakaoNickname)) {
73+
// 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);
78+
return generateTokenResponse(newUser, response);
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}
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}
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/**
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* JWT 토큰 생성
84+
*/
85+
private ResponseResult generateTokenResponse(User user, HttpServletResponse response) {
86+
String jwtAccessToken = jwtProvider.createAccessToken(user.getUserId());
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String jwtRefreshToken = jwtProvider.createRefreshToken(user.getUserId());
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//refreshToken - 쿠키
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ResponseCookie refreshCookie = getRefreshToken(jwtRefreshToken);
91+
response.setHeader("Set-Cookie", refreshCookie.toString());
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//accessToken - 바디
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Map<String, String> responseBody = new HashMap<>();
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responseBody.put("accessToken", jwtAccessToken);
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97+
return new ResponseResult(responseBody);
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}
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/**
101+
* 새로운 카카오 사용자 회원가입
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*/
103+
private User registerNewKakaoUser(KakaoUserDTO kakaoUser, String nickname) {
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User newUser = User.builder()
105+
.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(null))
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.email(kakaoUser.kakao_account().email())
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.build();
112+
return userRepository.save(newUser);
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}
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/**
117+
* 닉네임이 중복될 경우 새로운 닉네임 생성
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*/
119+
private String generateUniqueNickname(String baseNickname) {
120+
int suffix = 1;
121+
String newNickname = baseNickname;
122+
123+
// 닉네임이 중복되지 않을 때까지 반복
124+
while (userRepository.existsByNickname(newNickname)) {
125+
newNickname = baseNickname + "_" + suffix;
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suffix++;
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}
128+
return newNickname;
129+
}
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// RefreshToken을 쿠키로 설정
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private ResponseCookie getRefreshToken(String refreshToken) {
133+
return ResponseCookie
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.from("REFRESHTOKEN", refreshToken)
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.domain(domain)
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.path("/")
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.httpOnly(true)
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.secure(false)
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.maxAge(REFRESH_TOKEN_EXPIRATION_TIME/1000) // 만료시간 설정(밀리초 -> 초로 변경)
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.build();
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}
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}

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

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import org.dfbf.soundlink.domain.user.repository.ProfileMusicRepository;
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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.TokenProperties;
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import org.dfbf.soundlink.global.exception.ErrorCode;
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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.cache.annotation.CachePut;
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import org.springframework.data.redis.core.RedisTemplate;
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import org.springframework.http.ResponseCookie;
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import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
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import org.springframework.stereotype.Service;
@@ -235,7 +232,8 @@ public ResponseResult login(LoginReqDto loginReqDto, HttpServletResponse respons
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return new ResponseResult(ErrorCode.FAIL_TO_FIND_USER, "계정을 찾을 수 없습니다.");
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}
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// 비밀번호 검증(암호화 된 비밀번호 비교)
238-
if(!passwordEncoder.matches(loginReqDto.password(), userRepository.findPasswordByLoginId(loginReqDto.loginId()))){
235+
if( loginReqDto.password() == null || loginReqDto.password().isEmpty() ||
236+
!passwordEncoder.matches(loginReqDto.password(), userRepository.findPasswordByLoginId(loginReqDto.loginId()))){
239237
return new ResponseResult( ErrorCode.NOT_EQUALS_PASSWORD,"잘못된 비밀번호 입니다.");
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}
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‎src/main/java/org/dfbf/soundlink/global/auth/client/KakaoAuthClient.java‎

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package org.dfbf.soundlink.global.auth.client;
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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.springframework.cloud.openfeign.FeignClient;
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import org.springframework.util.MultiValueMap;
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import org.springframework.web.bind.annotation.GetMapping;
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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.RequestHeader;
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@FeignClient(name = "kakaoAuthClient", url = "https://kauth.kakao.com")
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public interface KakaoAuthClient {
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// 카카오 Access Token 요청
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@PostMapping("/oauth/token")
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KakaoTokenResponseDTO getAccessToken(@RequestBody MultiValueMap<String, String> params);
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// 카카오 사용자 정보 요청
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@GetMapping("/v2/user/me")
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KakaoUserDTO getUserInfo(@RequestHeader("Authorization") String accessToken);
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}

‎src/main/java/org/dfbf/soundlink/global/auth/client/KakaoUserClient.java‎

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package org.dfbf.soundlink.global.auth.client;
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import org.dfbf.soundlink.domain.user.dto.response.KakaoUserDTO;
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import org.springframework.cloud.openfeign.FeignClient;
5+
import org.springframework.web.bind.annotation.GetMapping;
6+
import org.springframework.web.bind.annotation.RequestHeader;
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8+
@FeignClient(name = "kakaoUserClient", url = "https://kapi.kakao.com")
9+
public interface KakaoUserClient {
10+
@GetMapping("/v2/user/me")
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KakaoUserDTO getUserInfo(@RequestHeader("Authorization") String accessToken);
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}

‎src/main/java/org/dfbf/soundlink/global/config/CustomFeignErrorDecoder.java‎

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package org.dfbf.soundlink.global.config;
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import feign.Response;
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import feign.codec.ErrorDecoder;
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import org.dfbf.soundlink.global.exception.BusinessException;
6+
import org.dfbf.soundlink.global.exception.ErrorCode;
7+
import org.slf4j.Logger;
8+
import org.slf4j.LoggerFactory;
9+
import org.springframework.http.HttpStatus;
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11+
public class CustomFeignErrorDecoder implements ErrorDecoder {
12+
private static final Logger log = LoggerFactory.getLogger(CustomFeignErrorDecoder.class);
13+
private final ErrorDecoder defaultErrorDecoder = new Default();
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@Override
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public Exception decode(String methodKey, Response response) {
17+
HttpStatus status = HttpStatus.valueOf(response.status());
18+
log.error("Feign 요청 실패: methodKey={}, status={}", methodKey, status);
19+
20+
return switch (status) {
21+
case UNAUTHORIZED -> // 401
22+
new BusinessException(ErrorCode.KAKAO_API_UNAUTHORIZED);
23+
case FORBIDDEN -> // 403
24+
new BusinessException(ErrorCode.KAKAO_API_FORBIDDEN);
25+
case BAD_REQUEST -> // 400
26+
new BusinessException(ErrorCode.KAKAO_API_BAD_REQUEST);
27+
case INTERNAL_SERVER_ERROR -> // 500
28+
new BusinessException(ErrorCode.KAKAO_API_SERVER_ERROR);
29+
default -> defaultErrorDecoder.decode(methodKey, response);
30+
};
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}
32+
}

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