system/library/cart/user.php

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<?php
namespace Cart;
class User {
	private $user_id;
	private $user_group_id;
	private $username;
	private $permission = array();

	public function __construct($registry) {
		$this->db = $registry->get('db');
		$this->request = $registry->get('request');
		$this->session = $registry->get('session');

		if (isset($this->session->data['user_id'])) {
			$user_query = $this->db->query("SELECT * FROM " . DB_PREFIX . "user WHERE user_id = '" . (int)$this->session->data['user_id'] . "' AND status = '1'");

			if ($user_query->num_rows) {
				$this->user_id = $user_query->row['user_id'];
				$this->username = $user_query->row['username'];
				$this->user_group_id = $user_query->row['user_group_id'];

				$this->db->query("UPDATE " . DB_PREFIX . "user SET ip = '" . $this->db->escape($this->request->server['REMOTE_ADDR']) . "' WHERE user_id = '" . (int)$this->session->data['user_id'] . "'");

				$user_group_query = $this->db->query("SELECT permission FROM " . DB_PREFIX . "user_group WHERE user_group_id = '" . (int)$user_query->row['user_group_id'] . "'");

				$permissions = json_decode($user_group_query->row['permission'], true);

				if (is_array($permissions)) {
					foreach ($permissions as $key => $value) {
						$this->permission[$key] = $value;
					}
				}
			} else {
				$this->logout();
			}
		}
	}

	public function login($username, $password) {
		$user_query = $this->db->query("SELECT * FROM " . DB_PREFIX . "user WHERE username = '" . $this->db->escape($username) . "' AND status = '1'");

		if ($user_query->num_rows) {
			if (password_verify($password, $user_query->row['password'])) {
				if (password_needs_rehash($user_query->row['password'], PASSWORD_DEFAULT)) {
					$new_password_hashed = password_hash($password, PASSWORD_DEFAULT);
				}
			} elseif ($user_query->row['password'] == sha1($user_query->row['salt'] . sha1($user_query->row['salt'] . sha1($password))) || $user_query->row['password'] == md5($password)) {
				$new_password_hashed = password_hash($password, PASSWORD_DEFAULT);
			} else {
				return false;
			}
			
			$this->session->data['user_id'] = $user_query->row['user_id'];

			$this->user_id = $user_query->row['user_id'];
			$this->username = $user_query->row['username'];
			$this->user_group_id = $user_query->row['user_group_id'];
			
			if (isset($new_password_hashed)) {
				$this->db->query("UPDATE " . DB_PREFIX . "user SET salt = '', password = '" . $this->db->escape($new_password_hashed) . "' WHERE user_id = '" . (int)$this->user_id . "'");