first commit

app/Utils/authHelper.php

@@ -0,0 +1,43 @@
+<?php
+namespace Blog\Utils;
+
+use Blog\Model\userModel;
+use Exception;
+
+class AuthHelper {
+  private static ?UserModel $userModel = null;
+
+  public static function initialize(UserModel $userModel): void {
+    self::$userModel = $userModel;
+  }
+
+  public static function login(string $username, string $password): bool {
+    if(!self::$userModel)
+      throw new Exception("AuthHelper was not initialized. Please pass UserModel.");
+
+    $user = self::$userModel->getUserByUsername($username);
+    if(!$user || !password_verify($password, $user->getPassword())) {
+      return false;
+    }
+
+    $_SESSION['user'] = [
+      'id' => $user->getId(),
+      'username' => $user->getUsername()
+    ];
+
+    return true;
+  }
+
+  public static function logout(): void {
+    session_unset();
+    session_destroy();
+  }
+
+  public static function isLoggedIn(): bool {
+    return isset($_SESSION['user']);
+  }
+
+  public static function getCurrentUser(): ?array {
+    return $_SESSION['user'] ?? null;
+  }
+}