User service added login and returning token

buisnesslogic/src/main/java/com/plannaplan/services/UserService.java

@@ -1,6 +1,10 @@
 package com.plannaplan.services;
 
+import java.util.UUID;
+
 import com.plannaplan.abstracts.EventWatcher;
+import com.plannaplan.entities.User;
+import com.plannaplan.exceptions.UserNotFoundException;
 import com.plannaplan.repositories.UserRepository;
 
 import org.springframework.beans.factory.annotation.Autowired;
@@ -15,4 +19,22 @@ public class UserService extends EventWatcher {
         super();
     }
 
+    public String login(String authority) throws UserNotFoundException {
+        User user = this.repo.getByAuthority(authority);
+        if (user == null) {
+            throw new UserNotFoundException("Can not find user with given authority");
+        }
+        String token = UUID.randomUUID().toString();
+        user.setToken(token);
+        return token;
+    }
+
+    public void save(User user) {
+        this.repo.save(user);
+    }
+
+    public User getUserByEmail(String email) {
+        return this.repo.getByAuthority(email);
+    }
+
 }