[WALWAL-155] 카카오 로그인/회원가입 구현

src/main/java/com/depromeet/stonebed/domain/auth/application/AuthService.java

@@ -1,6 +1,7 @@
 package com.depromeet.stonebed.domain.auth.application;
 
 import com.depromeet.stonebed.domain.auth.application.apple.AppleClient;
+import com.depromeet.stonebed.domain.auth.application.kakao.KakaoClient;
 import com.depromeet.stonebed.domain.auth.domain.OAuthProvider;
 import com.depromeet.stonebed.domain.auth.dto.RefreshTokenDto;
 import com.depromeet.stonebed.domain.auth.dto.request.RefreshTokenRequest;
@@ -14,7 +15,6 @@
 import com.depromeet.stonebed.global.error.ErrorCode;
 import com.depromeet.stonebed.global.error.exception.CustomException;
 import com.depromeet.stonebed.global.util.MemberUtil;
-import java.security.InvalidParameterException;
 import java.util.Optional;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
@@ -28,6 +28,7 @@
 public class AuthService {
 
     private final AppleClient appleClient;
+    private final KakaoClient kakaoClient;
     private final MemberService memberService;
     private final JwtTokenService jwtTokenService;
     private final MemberUtil memberUtil;
@@ -39,9 +40,7 @@ public SocialClientResponse authenticateFromProvider(OAuthProvider provider, Str
          */
         return switch (provider) {
             case APPLE -> appleClient.authenticateFromApple(token);
-                // TODO: 추후 카카오 개발 예정
-                // case KAKAO -> authenticateFromKakao(accessToken);
-            default -> throw new InvalidParameterException();
+            case KAKAO -> kakaoClient.authenticateFromKakao(token);
         };
     }
 

src/main/java/com/depromeet/stonebed/domain/auth/application/apple/AppleClient.java

@@ -50,14 +50,55 @@ public class AppleClient {
 
     private static final int APPLE_TOKEN_EXPIRE_MINUTES = 5;
 
+    /**
+     * Apple로부터 받은 idToken 검증하고 identifier를 추출합니다.
+     *
+     * @param authorizationCode
+     * @return
+     */
+    public SocialClientResponse authenticateFromApple(String authorizationCode) {
+        AppleTokenRequest tokenRequest =
+                AppleTokenRequest.of(
+                        authorizationCode,
+                        appleProperties.dev().clientId(),
+                        generateAppleClientSecret(),
+                        APPLE_GRANT_TYPE);
+        AppleTokenResponse appleTokenResponse = getAppleToken(tokenRequest);
+
+        AppleKeyResponse[] keys = retrieveAppleKeys();
+        try {
+            String[] tokenParts = appleTokenResponse.idToken().split("\\.");
+            String headerPart = new String(Base64.getDecoder().decode(tokenParts[0]));
+            JsonNode headerNode = objectMapper.readTree(headerPart);
+            String kid = headerNode.get("kid").asText();
+            String alg = headerNode.get("alg").asText();
+
+            AppleKeyResponse matchedKey =
+                    Arrays.stream(keys)
+                            .filter(key -> key.kid().equals(kid) && key.alg().equals(alg))
+                            .findFirst()
+                            // 일치하는 키가 없음 => 만료된 토큰 or 이상한 토큰 => throw
+                            .orElseThrow(InvalidParameterException::new);
+
+            Claims claims = parseIdentifierFromAppleToken(matchedKey, appleTokenResponse.idToken());
+
+            String oauthId = claims.get("sub", String.class);
+            String email = claims.get("email", String.class);
+
+            return new SocialClientResponse(email, oauthId);
+        } catch (Exception ex) {
+            throw new CustomException(ErrorCode.INTERNAL_SERVER_ERROR);
+        }
+    }
+
     // apple server에서 받아온 id_token
     private AppleTokenResponse getAppleToken(AppleTokenRequest appleTokenRequest) {
         // Prepare form data
         MultiValueMap<String, String> formData = new LinkedMultiValueMap<>();
-        formData.add("client_id", appleTokenRequest.client_id());
-        formData.add("client_secret", appleTokenRequest.client_secret());
+        formData.add("client_id", appleTokenRequest.clientId());
+        formData.add("client_secret", appleTokenRequest.clientSecret());
         formData.add("code", appleTokenRequest.code());
-        formData.add("grant_type", appleTokenRequest.grant_type());
+        formData.add("grant_type", appleTokenRequest.grantType());
 
         return restClient
                 .post()
@@ -107,48 +148,6 @@ private PrivateKey getPrivateKey() {
         }
     }
 
-    /**
-     * Apple로부터 받은 idToken 검증하고 identifier를 추출합니다.
-     *
-     * @param authorizationCode
-     * @return
-     */
-    public SocialClientResponse authenticateFromApple(String authorizationCode) {
-        AppleTokenRequest tokenRequest =
-                AppleTokenRequest.of(
-                        authorizationCode,
-                        appleProperties.dev().clientId(),
-                        generateAppleClientSecret(),
-                        APPLE_GRANT_TYPE);
-        AppleTokenResponse appleTokenResponse = getAppleToken(tokenRequest);
-
-        AppleKeyResponse[] keys = retrieveAppleKeys();
-        try {
-            String[] tokenParts = appleTokenResponse.id_token().split("\\.");
-            String headerPart = new String(Base64.getDecoder().decode(tokenParts[0]));
-            JsonNode headerNode = objectMapper.readTree(headerPart);
-            String kid = headerNode.get("kid").asText();
-            String alg = headerNode.get("alg").asText();
-
-            AppleKeyResponse matchedKey =
-                    Arrays.stream(keys)
-                            .filter(key -> key.kid().equals(kid) && key.alg().equals(alg))
-                            .findFirst()
-                            // 일치하는 키가 없음 => 만료된 토큰 or 이상한 토큰 => throw
-                            .orElseThrow(InvalidParameterException::new);
-
-            Claims claims =
-                    parseIdentifierFromAppleToken(matchedKey, appleTokenResponse.id_token());
-
-            String oauthId = claims.get("sub", String.class);
-            String email = claims.get("email", String.class);
-
-            return new SocialClientResponse(email, oauthId);
-        } catch (Exception ex) {
-            throw new CustomException(ErrorCode.INTERNAL_SERVER_ERROR);
-        }
-    }
-
     private AppleKeyResponse[] retrieveAppleKeys() {
         AppleKeyListResponse keyListResponse =
                 restClient

src/main/java/com/depromeet/stonebed/domain/auth/application/kakao/KakaoClient.java

@@ -0,0 +1,38 @@
+package com.depromeet.stonebed.domain.auth.application.kakao;
+
+import static com.depromeet.stonebed.global.common.constants.SecurityConstants.*;
+
+import com.depromeet.stonebed.domain.auth.dto.response.KakaoAuthResponse;
+import com.depromeet.stonebed.domain.auth.dto.response.SocialClientResponse;
+import com.depromeet.stonebed.global.error.ErrorCode;
+import com.depromeet.stonebed.global.error.exception.CustomException;
+import java.util.Objects;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Component;
+import org.springframework.web.client.RestClient;
+
+@Component
+@RequiredArgsConstructor
+public class KakaoClient {
+    private final RestClient restClient;
+
+    public SocialClientResponse authenticateFromKakao(String token) {
+        KakaoAuthResponse kakaoAuthResponse =
+                restClient
+                        .get()
+                        .uri(KAKAO_USER_ME_URL)
+                        .header("Authorization", TOKEN_PREFIX + token)
+                        .exchange(
+                                (request, response) -> {
+                                    if (!response.getStatusCode().is2xxSuccessful()) {
+                                        throw new CustomException(
+                                                ErrorCode.APPLE_TOKEN_CLIENT_FAILED);
+                                    }
+                                    return Objects.requireNonNull(
+                                            response.bodyTo(KakaoAuthResponse.class));
+                                });
+
+        return new SocialClientResponse(
+                kakaoAuthResponse.kakaoAccount().email(), kakaoAuthResponse.id().toString());
+    }
+}

src/main/java/com/depromeet/stonebed/domain/auth/dto/request/AppleTokenRequest.java

@@ -1,8 +1,13 @@
 package com.depromeet.stonebed.domain.auth.dto.request;
 
+import com.fasterxml.jackson.annotation.JsonProperty;
+
 public record AppleTokenRequest(
         // 외부 통신 시 snake_case로 요청 및 응답
-        String code, String client_id, String client_secret, String grant_type) {
+        @JsonProperty("code") String code,
+        @JsonProperty("client_id") String clientId,
+        @JsonProperty("client_secret") String clientSecret,
+        @JsonProperty("grant_type") String grantType) {
     public static AppleTokenRequest of(
             String code, String clientId, String clientSecret, String grantType) {
         return new AppleTokenRequest(code, clientId, clientSecret, grantType);

src/main/java/com/depromeet/stonebed/domain/auth/dto/response/AppleTokenResponse.java

@@ -1,12 +1,14 @@
 package com.depromeet.stonebed.domain.auth.dto.response;
 
+import com.fasterxml.jackson.annotation.JsonProperty;
+
 public record AppleTokenResponse(
         // 외부 통신 시 snake_case로 요청 및 응답
-        String access_token,
-        Long expires_in,
-        String id_token,
-        String refresh_token,
-        String token_type) {
+        @JsonProperty("access_token") String accessToken,
+        @JsonProperty("expires_in") Long expiresIn,
+        @JsonProperty("id_token") String idToken,
+        @JsonProperty("refresh_token") String refreshToken,
+        @JsonProperty("token_type") String tokenType) {
     public static AppleTokenResponse of(
             String accessToken,
             Long expiresIn,

src/main/java/com/depromeet/stonebed/domain/auth/dto/response/KakaoAuthResponse.java

@@ -0,0 +1,13 @@
+package com.depromeet.stonebed.domain.auth.dto.response;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+public record KakaoAuthResponse(
+        Long id,
+        @JsonProperty("kakao_account") KakaoAccountResponse kakaoAccount,
+        @JsonProperty("properties") PropertiesResponse properties) {
+    public static record KakaoAccountResponse(String email) {}
+
+    public static record PropertiesResponse(
+            String nickname, String profile_image, String thumbnail_image) {}
+}

src/main/java/com/depromeet/stonebed/global/common/constants/SecurityConstants.java

@@ -2,12 +2,18 @@
 
 public final class SecurityConstants {
 
-    public static final String TOKEN_ROLE_NAME = "role";
-    public static final String TOKEN_PREFIX = "Bearer ";
+    // apple
     public static final String APPLE_JWK_SET_URL = "https://appleid.apple.com/auth/keys";
     public static final String APPLE_ISSUER = "https://appleid.apple.com";
     public static final String APPLE_TOKEN_URL = "https://appleid.apple.com/auth/token";
     public static final String APPLE_GRANT_TYPE = "authorization_code";
+
+    // kakao
+    public static final String KAKAO_USER_ME_URL = "https://kapi.kakao.com/v2/user/me";
+
+    // security
+    public static final String TOKEN_ROLE_NAME = "role";
+    public static final String TOKEN_PREFIX = "Bearer ";
     public static final String ACCESS_TOKEN_COOKIE_NAME = "accessToken";
     public static final String REFRESH_TOKEN_COOKIE_NAME = "refreshToken";
     public static final String APPLICATION_URLENCODED = "application/x-www-form-urlencoded";

src/main/java/com/depromeet/stonebed/global/error/ErrorCode.java

@@ -21,6 +21,9 @@ public enum ErrorCode {
     APPLE_TOKEN_CLIENT_FAILED(HttpStatus.BAD_REQUEST, "애플 토큰 생성에 실패했습니다."),
     APPLE_PRIVATE_KEY_ENCODING_FAILED(HttpStatus.BAD_REQUEST, "애플 개인키 인코딩에 실패했습니다."),
 
+    // kakao client
+    KAKAO_TOKEN_CLIENT_FAILED(HttpStatus.BAD_REQUEST, "카카오 통신에 실패했습니다."),
+
     // member
     MEMBER_NOT_FOUND(HttpStatus.NOT_FOUND, "해당 회원을 찾을 수 없습니다."),
     ALREADY_EXISTS_MEMBER(HttpStatus.CONFLICT, "이미 존재하는 회원입니다."),