[FEAT/#54] 애플 로그인 구현

src/main/java/com/acon/server/global/auth/jwt/JwtTokenProvider.java

@@ -1,5 +1,10 @@
 package com.acon.server.global.auth.jwt;
 
+import static org.apache.commons.codec.binary.Base64.decodeBase64;
+
+import com.acon.server.global.exception.BusinessException;
+import com.acon.server.global.exception.ErrorType;
+import com.fasterxml.jackson.databind.ObjectMapper;
 import io.jsonwebtoken.Claims;
 import io.jsonwebtoken.ExpiredJwtException;
 import io.jsonwebtoken.Header;
@@ -8,9 +13,12 @@
 import io.jsonwebtoken.UnsupportedJwtException;
 import io.jsonwebtoken.security.Keys;
 import jakarta.annotation.PostConstruct;
+import java.io.IOException;
 import java.nio.charset.StandardCharsets;
+import java.security.PublicKey;
 import java.util.Base64;
 import java.util.Date;
+import java.util.Map;
 import javax.crypto.SecretKey;
 import lombok.RequiredArgsConstructor;
 import org.springframework.beans.factory.annotation.Value;
@@ -107,4 +115,22 @@ public Long getMemberIdFromJwt(String token) {
 
         return Long.valueOf(claims.get(MEMBER_ID).toString());
     }
+
+    public Map<String, String> parseHeaders(String token) {
+        String header = token.split("\\.")[0];
+
+        try {
+            return new ObjectMapper().readValue(decodeBase64(header), Map.class);
+        } catch (IOException e) {
+            throw new BusinessException(ErrorType.INTERNAL_SERVER_ERROR);
+        }
+    }
+
+    public Claims getTokenClaims(String token, PublicKey publicKey) {
+        return Jwts.parserBuilder()
+                .setSigningKey(publicKey)
+                .build()
+                .parseClaimsJws(token)
+                .getBody();
+    }
 }

src/main/java/com/acon/server/global/config/OpenFeignConfig.java

@@ -1,12 +1,19 @@
 package com.acon.server.global.config;
 
 import com.acon.server.ServerApplication;
+import feign.Retryer;
+import feign.Retryer.Default;
 import org.springframework.cloud.openfeign.EnableFeignClients;
+import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 
 @Configuration
 @EnableFeignClients(basePackageClasses = ServerApplication.class)
 public class OpenFeignConfig {
 
+    @Bean
+    public Retryer retryer() {
+        return new Default(1000, 1500, 2);
+    }
     // TODO: 타임아웃 설정 추가, 서킷 브레이커 적용하기
 }

src/main/java/com/acon/server/member/application/service/MemberService.java

@@ -23,6 +23,7 @@
 import com.acon.server.member.infra.entity.MemberEntity;
 import com.acon.server.member.infra.entity.VerifiedAreaEntity;
 import com.acon.server.member.infra.external.google.GoogleSocialService;
+import com.acon.server.member.infra.external.ios.AppleAuthAdapter;
 import com.acon.server.member.infra.repository.GuidedSpotRepository;
 import com.acon.server.member.infra.repository.MemberRepository;
 import com.acon.server.member.infra.repository.PreferenceRepository;
@@ -55,6 +56,7 @@ public class MemberService {
     private final JwtTokenProvider jwtTokenProvider;
     private final PrincipalHandler principalHandler;
     private final GoogleSocialService googleSocialService;
+    private final AppleAuthAdapter appleAuthService;
 
     private final NaverMapsAdapter naverMapsAdapter;
 
@@ -66,7 +68,16 @@ public LoginResponse login(
             final SocialType socialType,
             final String idToken
     ) {
-        String socialId = googleSocialService.login(idToken);
+        String socialId;
+
+        if (socialType == SocialType.GOOGLE) {
+            socialId = googleSocialService.login(idToken);
+        } else if (socialType == SocialType.APPLE) {
+            socialId = appleAuthService.getAppleAccountId(idToken);
+        } else {
+            throw new BusinessException(ErrorType.INVALID_SOCIAL_TYPE_ERROR);
+        }
+
         Long memberId = fetchMemberId(socialType, socialId);
         MemberAuthentication memberAuthentication = new MemberAuthentication(memberId, null, null);
         String accessToken = jwtTokenProvider.issueAccessToken(memberAuthentication);

src/main/java/com/acon/server/member/infra/external/google/GoogleSocialService.java

@@ -46,6 +46,7 @@ public String login(String unverifiedIdToken) {
     private GoogleIdToken verifyIdToken(String unverifiedIdToken) {
         try {
             GoogleIdToken idToken = verifier.verify(unverifiedIdToken);
+
             if (idToken == null) {
                 throw new BusinessException(ErrorType.INVALID_ID_TOKEN_ERROR);
             }

src/main/java/com/acon/server/member/infra/external/ios/AppleAuthAdapter.java

@@ -0,0 +1,24 @@
+package com.acon.server.member.infra.external.ios;
+
+import com.acon.server.global.auth.jwt.JwtTokenProvider;
+import java.security.PublicKey;
+import java.util.Map;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+
+@Service
+@RequiredArgsConstructor
+public class AppleAuthAdapter {
+
+    private final AppleAuthClient appleAuthClient;
+    private final ApplePublicKeyGenerator applePublicKeyGenerator;
+    private final JwtTokenProvider jwtTokenProvider;
+
+    public String getAppleAccountId(String identityToken) {
+        Map<String, String> headers = jwtTokenProvider.parseHeaders(identityToken);
+        PublicKey publicKey =
+                applePublicKeyGenerator.generatePublicKey(headers, appleAuthClient.getAppleAuthPublicKey());
+
+        return jwtTokenProvider.getTokenClaims(identityToken, publicKey).getSubject();
+    }
+}

src/main/java/com/acon/server/member/infra/external/ios/AppleAuthClient.java

@@ -0,0 +1,11 @@
+package com.acon.server.member.infra.external.ios;
+
+import org.springframework.cloud.openfeign.FeignClient;
+import org.springframework.web.bind.annotation.GetMapping;
+
+@FeignClient(name = "appleAuthClient", url = "${apple.auth.public-key-url}")
+public interface AppleAuthClient {
+
+    @GetMapping
+    ApplePublicKeyResponse getAppleAuthPublicKey();
+}

src/main/java/com/acon/server/member/infra/external/ios/ApplePublicKey.java

@@ -0,0 +1,11 @@
+package com.acon.server.member.infra.external.ios;
+
+public record ApplePublicKey(
+        String kty,
+        String kid,
+        String alg,
+        String n,
+        String e
+) {
+
+}

src/main/java/com/acon/server/member/infra/external/ios/ApplePublicKeyGenerator.java

@@ -0,0 +1,39 @@
+package com.acon.server.member.infra.external.ios;
+
+import static org.apache.commons.codec.binary.Base64.decodeBase64;
+
+import com.acon.server.global.exception.BusinessException;
+import com.acon.server.global.exception.ErrorType;
+import java.math.BigInteger;
+import java.security.KeyFactory;
+import java.security.NoSuchAlgorithmException;
+import java.security.PublicKey;
+import java.security.spec.InvalidKeySpecException;
+import java.security.spec.RSAPublicKeySpec;
+import java.util.Map;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Component;
+
+@Component
+@RequiredArgsConstructor
+public class ApplePublicKeyGenerator {
+
+    public PublicKey generatePublicKey(Map<String, String> tokenHeaders, ApplePublicKeyResponse applePublicKeys) {
+        ApplePublicKey publicKey = applePublicKeys.getMatchedKey(tokenHeaders.get("kid"), tokenHeaders.get("alg"));
+
+        return getPublicKey(publicKey);
+    }
+
+    private PublicKey getPublicKey(ApplePublicKey publicKey) {
+        byte[] nBytes = decodeBase64(publicKey.n());
+        byte[] eBytes = decodeBase64(publicKey.e());
+
+        RSAPublicKeySpec publicKeySpec = new RSAPublicKeySpec(new BigInteger(1, nBytes), new BigInteger(1, eBytes));
+
+        try {
+            return KeyFactory.getInstance(publicKey.kty()).generatePublic(publicKeySpec);
+        } catch (NoSuchAlgorithmException | InvalidKeySpecException e) {
+            throw new BusinessException(ErrorType.INTERNAL_SERVER_ERROR);
+        }
+    }
+}

src/main/java/com/acon/server/member/infra/external/ios/ApplePublicKeyResponse.java

@@ -0,0 +1,17 @@
+package com.acon.server.member.infra.external.ios;
+
+import com.acon.server.global.exception.BusinessException;
+import com.acon.server.global.exception.ErrorType;
+import java.util.List;
+
+public record ApplePublicKeyResponse(
+        List<ApplePublicKey> keys
+) {
+
+    public ApplePublicKey getMatchedKey(String kid, String alg) {
+        return keys.stream()
+                .filter(key -> key.kid().equals(kid) && key.alg().equals(alg))
+                .findAny()
+                .orElseThrow(() -> new BusinessException(ErrorType.INTERNAL_SERVER_ERROR));
+    }
+}