Added forum system

src/main/java/site/easystartup/web/service/UserService.java

@@ -1,7 +1,8 @@
 package site.easystartup.web.service;
 
 import lombok.RequiredArgsConstructor;
-import org.hibernate.query.criteria.internal.predicate.PredicateImplementor;
+import org.springframework.security.core.Authentication;
+import org.springframework.security.core.context.SecurityContextHolder;
 import org.springframework.security.core.userdetails.UsernameNotFoundException;
 import org.springframework.stereotype.Service;
 import site.easystartup.web.domain.User;
@@ -21,4 +22,12 @@ public class UserService {
     public User getUserById(Long userId) {
         return userRepo.findById(userId).orElseThrow(() -> new UsernameNotFoundException("User not found"));
     }
+
+    public User getCurrentUser() {
+        Authentication auth = SecurityContextHolder.getContext().getAuthentication();
+        if(auth.isAuthenticated()) throw new UserNotAuthenticatedException();
+        org.springframework.security.core.userdetails.User user = (org.springframework.security.core.userdetails.User)
+                auth.getPrincipal();
+        return userRepo.findByUsername(user.getUsername());
+    }
 }