Feat: 토큰으로 유저 조회 GRPC

src/main/java/flipnote/user/user/presentation/grpc/GrpcUserQueryService.java

@@ -1,9 +1,13 @@
 package flipnote.user.user.presentation.grpc;
 
+import flipnote.user.auth.domain.TokenClaims;
+import flipnote.user.auth.infrastructure.jwt.JwtProvider;
 import flipnote.user.user.domain.User;
 import flipnote.user.user.domain.UserRepository;
 import flipnote.user.grpc.GetUserByEmailRequest;
 import flipnote.user.grpc.GetUserByEmailResponse;
+import flipnote.user.grpc.GetUserByTokenRequest;
+import flipnote.user.grpc.GetUserByTokenResponse;
 import flipnote.user.grpc.GetUserRequest;
 import flipnote.user.grpc.GetUserResponse;
 import flipnote.user.grpc.GetUsersRequest;
@@ -23,6 +27,7 @@
 public class GrpcUserQueryService extends UserQueryServiceGrpc.UserQueryServiceImplBase {
 
     private final UserRepository userRepository;
+    private final JwtProvider jwtProvider;
 
     @Override
     public void getUser(GetUserRequest request, StreamObserver<GetUserResponse> responseObserver) {
@@ -85,6 +90,40 @@ public void getUserByEmail(GetUserByEmailRequest request, StreamObserver<GetUser
         }
     }
 
+    @Override
+    public void getUserByToken(GetUserByTokenRequest request, StreamObserver<GetUserByTokenResponse> responseObserver) {
+        try {
+            if (!jwtProvider.isTokenValid(request.getAccessToken())) {
+                responseObserver.onError(
+                        Status.UNAUTHENTICATED.withDescription("유효하지 않은 토큰입니다.").asRuntimeException()
+                );
+                return;
+            }
+
+            TokenClaims claims = jwtProvider.extractClaims(request.getAccessToken());
+            User user = userRepository.findByIdAndStatus(claims.userId(), User.Status.ACTIVE)
+                    .orElse(null);
+
+            if (user == null) {
+                responseObserver.onError(
+                        Status.NOT_FOUND.withDescription("사용자를 찾을 수 없습니다.").asRuntimeException()
+                );
+                return;
+            }
+
+            GetUserByTokenResponse response = GetUserByTokenResponse.newBuilder()
+                    .setUserId(user.getId())
+                    .setNickname(user.getNickname())
+                    .build();
+
+            responseObserver.onNext(response);
+            responseObserver.onCompleted();
+        } catch (Exception e) {
+            log.error("gRPC getUserByToken error", e);
+            responseObserver.onError(Status.INTERNAL.withDescription("Internal error").asRuntimeException());
+        }
+    }
+
     private GetUserResponse toResponse(User user) {
         return GetUserResponse.newBuilder()
                 .setId(user.getId())

src/main/proto/user_query.proto

@@ -10,6 +10,7 @@ service UserQueryService {
   rpc GetUser(GetUserRequest) returns (GetUserResponse);
   rpc GetUsers(GetUsersRequest) returns (GetUsersResponse);
   rpc GetUserByEmail(GetUserByEmailRequest) returns (GetUserByEmailResponse);
+  rpc GetUserByToken(GetUserByTokenRequest) returns (GetUserByTokenResponse);
 }
 
 message GetUserRequest {
@@ -39,3 +40,12 @@ message GetUserByEmailResponse {
   bool exists = 1;
   GetUserResponse user = 2;
 }
+
+message GetUserByTokenRequest {
+  string access_token = 1;
+}
+
+message GetUserByTokenResponse {
+  int64 user_id = 1;
+  string nickname = 2;
+}