feat(KL-155): create kakao oauth2

src/main/java/taco/klkl/domain/oauth/controller/OauthKakaoController.java

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+package taco.klkl.domain.oauth.controller;
+
+import java.net.URI;
+
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.tags.Tag;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import taco.klkl.domain.oauth.service.OauthKakaoService;
+import taco.klkl.domain.user.dto.response.UserDetailResponse;
+
+@Slf4j
+@RestController
+@RequestMapping("/v1/oauth/kakao")
+@RequiredArgsConstructor
+@Tag(name = "9. 인증/인가", description = "인증/인가 API")
+public class OauthKakaoController {
+
+	private final OauthKakaoService oauthKakaoService;
+
+	@Value("${spring.security.oauth2.client.registration.kakao.client-id}")
+	private String clientId;
+
+	@Value("${spring.security.oauth2.client.provider.kakao.authorization-uri}")
+	private String authorizationUri;
+
+	@Value("${spring.security.oauth2.client.registration.kakao.redirect-uri}")
+	private String redirectUri;
+
+	@Value("${api.main-url}")
+	private String mainUrl;
+
+	/**
+	 * 클라이언트를 Kakao Oauth URL로 리다이렉트합니다.
+	 * @return
+	 */
+	@GetMapping()
+	@Operation(summary = "kakao 간편로그인 요청", description = "카카오 oauth를 사용하여 로그인 처리합니다.")
+	public ResponseEntity<Void> oauthKakao() {
+		final String location = getKakaoOauthLocation();
+		final URI locationUri = URI.create(location);
+
+		return ResponseEntity
+			.status(HttpStatus.FOUND)
+			.location(locationUri)
+			.build();
+	}
+
+	/**
+	 * Kakao 리다이렉트 받은 code값으로 사용자 로그인처리를 합니다.
+	 * @param code
+	 * @return
+	 * @throws JsonProcessingException
+	 */
+	// TODO: JWT적용시 토큰 관리 로직 추가
+	@GetMapping("/code")
+	@Operation(summary = "kakao 사용자 정보 가져오기", description = "카카오 API를 사용하여 사용자 정보를 가져옵니다.")
+	public UserDetailResponse processKakaoOauth2(@RequestParam("code") final String code) throws
+		JsonProcessingException {
+
+		return oauthKakaoService.kakaoOauthLogin(code);
+	}
+
+	/**
+	 * Kakao Oauth 요청 URL을 구성합니다.
+	 * @return
+	 */
+	private String getKakaoOauthLocation() {
+		StringBuilder location = new StringBuilder();
+		location.append(authorizationUri)
+			.append("?response_type=").append("code")
+			.append("&client_id=").append(clientId)
+			.append("&redirect_uri=").append(mainUrl).append(redirectUri);
+
+		return location.toString();
+	}
+
+}

src/main/java/taco/klkl/domain/oauth/dao/OauthRepository.java

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+package taco.klkl.domain.oauth.dao;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import taco.klkl.domain.oauth.domain.Oauth;
+
+public interface OauthRepository extends JpaRepository<Oauth, Long> {
+	boolean existsByOauthMemberId(final Long oauthMemberId);
+
+	Oauth findFirstByOauthMemberId(final Long oauthMemberId);
+}

src/main/java/taco/klkl/domain/oauth/domain/Oauth.java

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+package taco.klkl.domain.oauth.domain;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.OneToOne;
+import lombok.AccessLevel;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import taco.klkl.domain.user.domain.User;
+
+@Getter
+@Entity(name = "oauth")
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+public class Oauth {
+
+	@Id
+	@Column(name = "oauth_id")
+	@GeneratedValue(strategy = GenerationType.AUTO)
+	Long id;
+
+	@OneToOne(optional = false, fetch = FetchType.EAGER)
+	private User user;
+
+	@Column(
+		name = "oauth_member_id",
+		nullable = false
+	)
+	private Long oauthMemberId;
+
+	private Oauth(final User user, final Long oauthMemberId) {
+		this.user = user;
+		this.oauthMemberId = oauthMemberId;
+	}
+
+	public static Oauth of(final User user, final Long oauth2MemberId) {
+		return new Oauth(user, oauth2MemberId);
+	}
+}

src/main/java/taco/klkl/domain/oauth/dto/request/KakaoUserInfoRequest.java

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+package taco.klkl.domain.oauth.dto.request;
+
+import lombok.extern.slf4j.Slf4j;
+
+@Slf4j
+public record KakaoUserInfoRequest(Long oauthMemberId, String nickname, String profileImage) {
+
+	public static KakaoUserInfoRequest of(final Long oauthMemberId, final String nickname, final String profileImage) {
+		return new KakaoUserInfoRequest(oauthMemberId, nickname, profileImage);
+	}
+}

src/main/java/taco/klkl/domain/oauth/service/OauthKakaoLoginService.java

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+package taco.klkl.domain.oauth.service;
+
+import org.springframework.stereotype.Service;
+
+import taco.klkl.domain.oauth.dto.request.KakaoUserInfoRequest;
+import taco.klkl.domain.user.dto.response.UserDetailResponse;
+
+@Service
+public interface OauthKakaoLoginService {
+	UserDetailResponse loginUser(final KakaoUserInfoRequest userInfoRequest);
+}

src/main/java/taco/klkl/domain/oauth/service/OauthKakaoLoginServiceImpl.java

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+package taco.klkl.domain.oauth.service;
+
+import org.springframework.context.annotation.Primary;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import taco.klkl.domain.oauth.dao.OauthRepository;
+import taco.klkl.domain.oauth.domain.Oauth;
+import taco.klkl.domain.oauth.dto.request.KakaoUserInfoRequest;
+import taco.klkl.domain.user.domain.Gender;
+import taco.klkl.domain.user.domain.User;
+import taco.klkl.domain.user.dto.request.UserCreateRequest;
+import taco.klkl.domain.user.dto.response.UserDetailResponse;
+import taco.klkl.domain.user.service.UserService;
+import taco.klkl.global.util.UserUtil;
+
+@Slf4j
+@Primary
+@Service
+@Transactional
+@RequiredArgsConstructor
+public class OauthKakaoLoginServiceImpl implements OauthKakaoLoginService {
+
+	private final OauthRepository oauthRepository;
+	private final UserService userService;
+	private final UserUtil userUtil;
+
+	/**
+	 * Oauth의 결과로 사용자 로그인 처리를 수행합니다.
+	 * TODO: 현재 더미유저 데이터로 인해 최초요청은 에러발생
+	 * @param userInfoRequest
+	 * @return
+	 */
+	public UserDetailResponse loginUser(final KakaoUserInfoRequest userInfoRequest) {
+
+		final Long oauthMemberId = userInfoRequest.oauthMemberId();
+
+		// 이미 oauth로그인 기록이 있는 유저를 처리합니다.
+		if (oauthRepository.existsByOauthMemberId(oauthMemberId)) {
+			final Oauth oauth = oauthRepository.findFirstByOauthMemberId(oauthMemberId);
+			final User user = oauth.getUser();
+			return UserDetailResponse.from(user);
+		}
+
+		final User user = registerUser(userInfoRequest);
+		final Oauth oauth = Oauth.of(user, userInfoRequest.oauthMemberId());
+		oauthRepository.save(oauth);
+
+		return UserDetailResponse.from(user);
+	}
+
+	private User registerUser(final KakaoUserInfoRequest userInfoRequest) {
+
+		final String name = userUtil.createUsername(userInfoRequest.nickname(), userInfoRequest.oauthMemberId());
+
+		// TODO: 성별, 나이는 기본값으로 넣고 있습니다.
+		final UserCreateRequest userCreateRequest = UserCreateRequest.of(
+			name,
+			Gender.MALE.getDescription(),
+			0,
+			userInfoRequest.profileImage(),
+			""
+		);
+
+		// 유저를 DB에 생성합니다.
+		return userService.createUser(userCreateRequest);
+	}
+}

src/main/java/taco/klkl/domain/oauth/service/OauthKakaoService.java

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+package taco.klkl.domain.oauth.service;
+
+import org.springframework.stereotype.Service;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+
+import taco.klkl.domain.user.dto.response.UserDetailResponse;
+
+@Service
+public interface OauthKakaoService {
+	UserDetailResponse kakaoOauthLogin(final String code) throws JsonProcessingException;
+}