feat: #86 애플 소셜 로그인 구현

build.gradle

@@ -63,6 +63,8 @@ dependencies {
     implementation("com.amazonaws:aws-java-sdk-s3")
     implementation("javax.xml.bind:jaxb-api:2.3.1")
 
+    // Apple id_token signature verify
+    implementation 'com.nimbusds:nimbus-jose-jwt:9.31'
 }
 
 tasks.named('test') {

src/main/java/org/jullaene/walkmong_back/api/member/domain/Member.java

@@ -6,6 +6,7 @@
 import lombok.NoArgsConstructor;
 import org.hibernate.annotations.Comment;
 import org.hibernate.annotations.DynamicUpdate;
+import org.jullaene.walkmong_back.api.member.domain.enums.Provider;
 import org.jullaene.walkmong_back.api.member.domain.enums.Role;
 import org.jullaene.walkmong_back.api.member.dto.req.MemberCreateReq;
 import org.jullaene.walkmong_back.api.member.dto.req.MemberReqDto;
@@ -66,6 +67,12 @@ public class Member extends BaseEntity {
     @Comment("산책 가능 반려동물 크기")
     private String availabilityWithSize;
 
+    @Comment("소셜 로그인 공급자 ID")
+    private String providerId;
+
+    @Comment("소셜 로그인 제공자")
+    @Enumerated(EnumType.STRING)
+    private Provider provider;
 
     @Builder
     public Member (MemberCreateReq memberCreateReq, String profileUrl) {
@@ -80,6 +87,17 @@ public Member (MemberCreateReq memberCreateReq, String profileUrl) {
         this.profile = profileUrl;
     }
 
+    public Member(String email, String providerId, Provider provider) {
+        this.email = email;
+        this.providerId = providerId;
+        this.provider = provider;
+    }
+
+    public void linkSocialAccount(String providerId, Provider provider) {
+        this.providerId = providerId;
+        this.provider = provider;
+    }
+
     public void addWalkingExperience(WalkExperienceReq walkExperienceReq) {
         this.dogOwnership = walkExperienceReq.getDogOwnershipYn();
         this.dogWalkingExperienceYn = walkExperienceReq.getDogWalkingExperienceYn();

src/main/java/org/jullaene/walkmong_back/api/member/domain/enums/Provider.java

@@ -0,0 +1,8 @@
+package org.jullaene.walkmong_back.api.member.domain.enums;
+
+public enum Provider {
+    APPLE,
+    GOOGLE,
+    NAVER,
+    ;
+}

src/main/java/org/jullaene/walkmong_back/api/member/dto/res/OAuthLoginResponseDto.java

@@ -0,0 +1,12 @@
+package org.jullaene.walkmong_back.api.member.dto.res;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+@Getter
+@AllArgsConstructor
+public class OAuthLoginResponseDto {
+    private String accessToken;
+    private String refreshToken;
+    private boolean isNewUser; // 새로운 필드 추가
+}

src/main/java/org/jullaene/walkmong_back/api/member/dto/res/OAuthUserInfoResponseDto.java

@@ -0,0 +1,24 @@
+package org.jullaene.walkmong_back.api.member.dto.res;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import lombok.AccessLevel;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+/**
+ * 소셜 로그인 유저 정보 DTO
+ */
+@Builder
+@NoArgsConstructor(access = AccessLevel.PUBLIC)
+@AllArgsConstructor
+@Data
+public class OAuthUserInfoResponseDto {
+    // 고유ID
+    @JsonProperty("sub")
+    private String subject;
+
+    @JsonProperty("email")
+    private String email;
+}

src/main/java/org/jullaene/walkmong_back/api/member/repository/MemberRepository.java

@@ -2,6 +2,7 @@
 
 import java.util.Optional;
 import org.jullaene.walkmong_back.api.member.domain.Member;
+import org.jullaene.walkmong_back.api.member.domain.enums.Provider;
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.data.jpa.repository.Query;
 import org.springframework.stereotype.Repository;
@@ -18,4 +19,8 @@ public interface MemberRepository extends JpaRepository<Member, Long>, MemberRep
     String findNickNameByMemberId(Long memberId);
 
     Optional<Member> findByMemberIdAndDelYn(Long memberId, String delYn);
+
+    Optional<Member> findByProviderIdAndProviderAndDelYn(String providerId, Provider provider, String delYn);
+
+    Optional<Member> findByEmailAndDelYn(String email, String delYn);
 }

src/main/java/org/jullaene/walkmong_back/api/oauth/dto/AppleTokenInfoResponseDto.java

@@ -0,0 +1,32 @@
+package org.jullaene.walkmong_back.api.oauth.dto;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import lombok.AccessLevel;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+/**
+ * 애플 소셜 토큰 응답 정보 DTO
+ */
+@Builder
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+@AllArgsConstructor
+@Data
+public class AppleTokenInfoResponseDto {
+    @JsonProperty("access_token")
+    private String accessToken;
+
+    @JsonProperty("token_type")
+    private String tokenType;
+
+    @JsonProperty("expires_in")
+    private Long expiresIn;
+
+    @JsonProperty("refresh_token")
+    private String refreshToken;
+
+    @JsonProperty("id_token")
+    private String idToken;
+}

src/main/java/org/jullaene/walkmong_back/api/oauth/rest/OAuthController.java

@@ -0,0 +1,47 @@
+package org.jullaene.walkmong_back.api.oauth.rest;
+
+import io.swagger.v3.oas.annotations.tags.Tag;
+import java.util.Map;
+import lombok.RequiredArgsConstructor;
+import org.jullaene.walkmong_back.api.member.domain.enums.Provider;
+import org.jullaene.walkmong_back.api.member.dto.res.OAuthLoginResponseDto;
+import org.jullaene.walkmong_back.api.member.dto.res.OAuthUserInfoResponseDto;
+import org.jullaene.walkmong_back.api.oauth.service.OAuthService;
+import org.jullaene.walkmong_back.common.BasicResponse;
+import org.jullaene.walkmong_back.api.oauth.service.AppleTokenService;
+import org.jullaene.walkmong_back.common.exception.CustomException;
+import org.jullaene.walkmong_back.common.exception.ErrorType;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+@Tag(name = "OAuth", description = "OAuth 인증 관련 api 입니다.")
+@RestController
+@RequiredArgsConstructor
+@RequestMapping("/api/v1/oauth")
+public class OAuthController {
+
+    private final AppleTokenService appleTokenService;
+    private final OAuthService oAuthService;
+
+    // redirect url로 authorizaion code 획득
+    @PostMapping("/apple/callback")
+    public ResponseEntity<BasicResponse<OAuthLoginResponseDto>> handleAppleCallback(@RequestParam Map<String, String> params) {
+        String authorizationCode = params.get("code");
+
+        if (authorizationCode == null || authorizationCode.isEmpty()) {
+            throw new CustomException(HttpStatus.BAD_REQUEST, ErrorType.MISSING_AUTHORIZATION_CODE);
+        }
+        // 1. Apple 토큰 API 호출 및 검증
+        OAuthUserInfoResponseDto userInfo = appleTokenService.processToken(authorizationCode);
+
+        // 2. 로그인 or 회원 가입 진행
+        OAuthLoginResponseDto loginResponse = oAuthService.handleSocialLogin(userInfo, Provider.APPLE);
+
+        // 3. 응답 반환
+        return ResponseEntity.ok(BasicResponse.ofSuccess(loginResponse));
+    }
+}

src/main/java/org/jullaene/walkmong_back/api/oauth/service/AppleTokenService.java

@@ -0,0 +1,156 @@
+package org.jullaene.walkmong_back.api.oauth.service;
+
+import com.nimbusds.jose.JOSEException;
+import com.nimbusds.jose.JWSAlgorithm;
+import com.nimbusds.jose.jwk.JWKSet;
+import com.nimbusds.jose.jwk.source.ImmutableJWKSet;
+import com.nimbusds.jose.jwk.source.JWKSource;
+import com.nimbusds.jose.proc.BadJOSEException;
+import com.nimbusds.jose.proc.JWSVerificationKeySelector;
+import com.nimbusds.jose.proc.SecurityContext;
+import com.nimbusds.jwt.JWTClaimsSet;
+import com.nimbusds.jwt.proc.ConfigurableJWTProcessor;
+import com.nimbusds.jwt.proc.DefaultJWTProcessor;
+import java.io.IOException;
+import java.net.URL;
+import java.text.ParseException;
+import java.util.Date;
+import org.jullaene.walkmong_back.api.member.dto.res.OAuthUserInfoResponseDto;
+import org.jullaene.walkmong_back.api.oauth.dto.AppleTokenInfoResponseDto;
+import org.jullaene.walkmong_back.api.oauth.utils.AppleClientSecretGenerator;
+import org.jullaene.walkmong_back.common.exception.CustomException;
+import org.jullaene.walkmong_back.common.exception.ErrorType;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.http.HttpEntity;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpMethod;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.stereotype.Service;
+import org.springframework.util.LinkedMultiValueMap;
+import org.springframework.util.MultiValueMap;
+import org.springframework.web.client.HttpClientErrorException;
+import org.springframework.web.client.RestTemplate;
+
+@Service
+public class AppleTokenService {
+
+    @Value("${apple.auth.client-id}")
+    private String clientId;
+
+    @Value("${apple.auth.token-url}")
+    private String tokenUrl;
+
+    @Value("${apple.auth.key-url}")
+    private String APPLE_PUBLIC_KEYS_URL;
+
+    @Value("${apple.auth.url}")
+    private String ISSUER;
+
+    @Value("${apple.auth.redirect-uri}")
+    private String redirectUri;
+
+    private final AppleClientSecretGenerator appleClientSecretGenerator;
+
+    public AppleTokenService(AppleClientSecretGenerator appleClientSecretGenerator) {
+        this.appleClientSecretGenerator = appleClientSecretGenerator;
+    }
+
+    public OAuthUserInfoResponseDto processToken(String authorizationCode) {
+        // 1. Client secret 생성
+        String clientSecret = appleClientSecretGenerator.generateClientSecret();
+
+        // 2. Apple 토큰 API 호출
+        AppleTokenInfoResponseDto tokenResponse = getIdToken(clientSecret, authorizationCode);
+
+        // 3. 토큰 검증 및 유저 정보 추출
+        return validateToken(tokenResponse);
+    }
+
+    private AppleTokenInfoResponseDto getIdToken(String clientSecret, String authorizationCode) {
+        RestTemplate restTemplate = new RestTemplate();
+
+        MultiValueMap<String, String> body = new LinkedMultiValueMap<>();
+        body.add("client_id", clientId);
+        body.add("client_secret", clientSecret);
+        body.add("code", authorizationCode);
+        body.add("grant_type", "authorization_code");
+        body.add("redirect_uri", redirectUri);
+
+        // HTTP 요청 생성
+        HttpHeaders headers = new HttpHeaders();
+        headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
+
+        HttpEntity<MultiValueMap<String, String>> requestEntity = new HttpEntity<>(body, headers);
+
+        try {
+            // Apple의 /auth/token API 호출
+            ResponseEntity<AppleTokenInfoResponseDto> response = restTemplate.exchange(
+                    tokenUrl, HttpMethod.POST, requestEntity, AppleTokenInfoResponseDto.class
+            );
+
+            if (response.getStatusCode() == HttpStatus.OK) {
+                return response.getBody();
+            } else {
+                throw new CustomException(HttpStatus.BAD_REQUEST, ErrorType.INVALID_GRANT);
+            }
+        } catch (HttpClientErrorException e) {
+            throw new CustomException(HttpStatus.BAD_REQUEST, ErrorType.INVALID_GRANT);
+        } catch (Exception e) {
+            throw new CustomException(HttpStatus.INTERNAL_SERVER_ERROR, ErrorType.INTERNAL_SERVER);
+        }
+    }
+
+    private OAuthUserInfoResponseDto validateToken(AppleTokenInfoResponseDto tokenResponse) {
+        try {
+            // 1. JWT Processor 설정
+            String idToken = tokenResponse.getIdToken();
+
+            ConfigurableJWTProcessor<SecurityContext> jwtProcessor = new DefaultJWTProcessor<>();
+
+            // 2. Apple 공개 키 가져오기
+            JWKSet jwkSet = JWKSet.load(new URL(APPLE_PUBLIC_KEYS_URL));
+
+            // 3. JWS 키 선택자 설정
+            JWKSource<SecurityContext> jwkSource = new ImmutableJWKSet<>(jwkSet);
+            JWSVerificationKeySelector<SecurityContext> keySelector =
+                    new JWSVerificationKeySelector<>(JWSAlgorithm.RS256, jwkSource);
+
+            // 4. JWT Processor에 Key Selector 연결
+            jwtProcessor.setJWSKeySelector(keySelector);
+
+            // 5. ID Token 검증
+            JWTClaimsSet claims = jwtProcessor.process(idToken, null);
+
+            // 6. Claim 검증
+            if (!ISSUER.equals(claims.getIssuer())) {
+                throw new CustomException(HttpStatus.UNAUTHORIZED, ErrorType.INVALID_TOKEN_ISSUER);
+            }
+
+            if (!claims.getAudience().contains(clientId)) {
+                throw new CustomException(HttpStatus.UNAUTHORIZED, ErrorType.INVALID_TOKEN_AUDIENCE);
+            }
+
+            Date expiration = claims.getExpirationTime();
+            if (expiration == null || expiration.before(new Date())) {
+                throw new CustomException(HttpStatus.UNAUTHORIZED, ErrorType.EXPIRED_APPLE_ID_TOKEN);
+            }
+
+            // 7. DTO로 변환하여 반환
+            return OAuthUserInfoResponseDto.builder()
+                    .subject(claims.getSubject())
+                    .email((String) claims.getClaim("email"))
+                    .build();
+
+        } catch (IOException e) {
+            throw new CustomException(HttpStatus.INTERNAL_SERVER_ERROR, ErrorType.APPLE_PUBLIC_KEY_LOAD_ERROR);
+        } catch (ParseException e) {
+            throw new CustomException(HttpStatus.INTERNAL_SERVER_ERROR, ErrorType.TOKEN_PARSE_ERROR);
+        } catch (JOSEException | BadJOSEException e) {
+            throw new CustomException(HttpStatus.INTERNAL_SERVER_ERROR, ErrorType.TOKEN_PROCESSING_ERROR);
+        } catch (IllegalArgumentException e) {
+            throw new CustomException(HttpStatus.UNAUTHORIZED, ErrorType.INVALID_TOKEN);
+        }
+    }
+}