implement registration validity checks

src/main/java/wtf/beatrice/releasehive/services/UserService.java

@@ -1,31 +1,15 @@
 package wtf.beatrice.releasehive.services;
 
-import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.security.core.userdetails.UsernameNotFoundException;
-import org.springframework.stereotype.Service;
 import wtf.beatrice.releasehive.models.User;
-import wtf.beatrice.releasehive.repositories.UserRepository;
 
 import java.util.List;
 
-@Service
-public class UserService
+public interface UserService
 {
-    private final UserRepository userRepository;
+    List<User> getAllUsers();
 
-    public UserService(@Autowired UserRepository userRepository) {
-        this.userRepository = userRepository;
-    }
+    User loadUserByUsername(String username) throws UsernameNotFoundException;
 
-    public List<User> getAllUsers() {
-        return userRepository.findAll();
-    }
-
-    public User loadUserByUsername(String username) throws UsernameNotFoundException {
-        return userRepository.findByUsername(username).orElseThrow(() -> new UsernameNotFoundException(username));
-    }
-
-    public User loadUserByEmail(String email) throws UsernameNotFoundException {
-        return userRepository.findByEmail(email).orElseThrow(() -> new UsernameNotFoundException(email));
-    }
+    User loadUserByEmail(String email) throws UsernameNotFoundException;
 }