implement AuthService.java

src/main/java/dev/service/AuthService.java

@@ -1,22 +1,39 @@
 package dev.service;
 
+import dev.dao.UserDao;
 import dev.model.User;
 
 public class AuthService {
 
+    UserDao userDao = new UserDao();
+
     public boolean register(String username, String password, String email) {
 
-        // TODO:
         // Validate and register user
+        if( username == null || username.isBlank() || password == null || password.isBlank())
+            return false;
 
+        if (userDao.findByUsername(username) == null) {
+
+            User user = new User();
+
+            user.setEmail(email);
+            user.setPassword(password);
+            user.setUsername(username);
+
+            return userDao.save(user);
+        }
         return false;
     }
 
     public User login(String username, String password) {
 
-        // TODO:
         // Authenticate user
+        User user = userDao.findByUsername(username);
 
+        if (user != null && user.getPassword().equals(password)) {
+            return user;
+        }
         return null;
     }