start backend

src/main/java/com/krylov/refound/service/UserService.java

@@ -1,4 +1,27 @@
 package com.krylov.refound.service;
 
+import com.krylov.refound.entity.User;
+import com.krylov.refound.enums.ErrorCode;
+import com.krylov.refound.exception.ApiException;
+import com.krylov.refound.repository.UserRepository;
+import com.krylov.refound.util.SecurityUtils;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.HttpStatus;
+import org.springframework.stereotype.Service;
+
+@Service
+@RequiredArgsConstructor
 public class UserService {
+  private final UserRepository repository;
+
+  public User getCurrentUser() {
+    String email = SecurityUtils.getCurrentUserEmail();
+
+    return repository.findByEmail(email)
+        .orElseThrow(() -> new ApiException(
+            ErrorCode.NOT_FOUND,
+            "User not found",
+            HttpStatus.NOT_FOUND
+        ));
+  }
 }