WS10

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

@@ -1,15 +1,33 @@
 package dev.service;
 
+import dev.dao.UserDao;
 import dev.model.User;
 
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+
 public class AuthService {
 
+    private final UserDao userDao = new UserDao();
+
     public boolean register(String username, String password, String email) {
 
         // TODO:
         // Validate and register user
 
-        return false;
+        if (username == null || username.isBlank() || password == null || password.isBlank()) {
+            System.out.println("Username and password are required.");
+            return false;
+        }
+
+        if (userDao.findByUsername(username) != null) {
+            System.out.println("Username already exists.");
+            return false;
+        }
+
+        User user = new User(0, username, hashPassword(password), email);
+
+        return userDao.save(user);
     }
 
     public User login(String username, String password) {
@@ -17,7 +35,44 @@ public class AuthService {
         // TODO:
         // Authenticate user
 
-        return null;
+        User user = userDao.findByUsername(username);
+
+        if (user == null) {
+            System.out.println("Invalid username or password.");
+            return null;
+        }
+
+        if (!user.getPassword().equals(hashPassword(password))) {
+            System.out.println("Invalid username or password.");
+            return null;
+        }
+
+        return user;
+    }
+
+    private String hashPassword(String password) {
+
+        try {
+            MessageDigest digest = MessageDigest.getInstance("SHA-256");
+            byte[] hashedBytes = digest.digest(password.getBytes());
+
+            StringBuilder hexString = new StringBuilder();
+
+            for (byte b : hashedBytes) {
+                String hex = Integer.toHexString(0xff & b);
+
+                if (hex.length() == 1) {
+                    hexString.append('0');
+                }
+
+                hexString.append(hex);
+            }
+
+            return hexString.toString();
+
+        } catch (NoSuchAlgorithmException e) {
+            throw new RuntimeException(e);
+        }
     }
 
 }