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name : admin.cls.php
 <?php
/**
 * The admin-panel specific functionality of the plugin.
 *
 *
 * @since      1.0.0
 * @package    LiteSpeed_Cache
 * @subpackage LiteSpeed_Cache/admin
 * @author     LiteSpeed Technologies <info@litespeedtech.com>
 */
namespace LiteSpeed;

defined('WPINC') || exit();

class Admin extends Root
{
	const LOG_TAG = '👮';

	const PAGE_EDIT_HTACCESS = 'litespeed-edit-htaccess';

	/**
	 * Initialize the class and set its properties.
	 * Run in hook `after_setup_theme` when is_admin()
	 *
	 * @since    1.0.0
	 */
	public function __construct()
	{
		// Define LSCWP_MU_PLUGIN if is mu-plugins
		if (defined('WPMU_PLUGIN_DIR') && dirname(LSCWP_DIR) == WPMU_PLUGIN_DIR) {
			define('LSCWP_MU_PLUGIN', true);
		}

		self::debug('No cache due to Admin page');
		defined('DONOTCACHEPAGE') || define('DONOTCACHEPAGE', true);

		// Additional litespeed assets on admin display
		// Also register menu
		$this->cls('Admin_Display');

		// initialize admin actions
		add_action('admin_init', array($this, 'admin_init'));
		// add link to plugin list page
		add_filter('plugin_action_links_' . LSCWP_BASENAME, array($this->cls('Admin_Display'), 'add_plugin_links'));
	}

	/**
	 * Callback that initializes the admin options for LiteSpeed Cache.
	 *
	 * @since 1.0.0
	 * @access public
	 */
	public function admin_init()
	{
		// Hook attachment upload
		if ($this->conf(Base::O_IMG_OPTM_AUTO)) {
			add_filter('wp_update_attachment_metadata', array($this, 'wp_update_attachment_metadata'), 9999, 2);
		}

		$this->_proceed_admin_action();

		// Terminate if user doesn't have the access to settings
		if (is_network_admin()) {
			$capability = 'manage_network_options';
		} else {
			$capability = 'manage_options';
		}
		if (!current_user_can($capability)) {
			return;
		}

		// Save setting from admin settings page
		// NOTE: cli will call `validate_plugin_settings` manually. Cron activation doesn't need to validate

		// Add privacy policy
		// @since 2.2.6
		if (function_exists('wp_add_privacy_policy_content')) {
			wp_add_privacy_policy_content(Core::NAME, Doc::privacy_policy());
		}

		$this->cls('Media')->after_admin_init();

		do_action('litspeed_after_admin_init');

		if ($this->cls('Router')->esi_enabled()) {
			add_action('in_widget_form', array($this->cls('Admin_Display'), 'show_widget_edit'), 100, 3);
			add_filter('widget_update_callback', __NAMESPACE__ . '\Admin_Settings::validate_widget_save', 10, 4);
		}
	}

	/**
	 * Handle attachment update
	 * @since  4.0
	 */
	public function wp_update_attachment_metadata($data, $post_id)
	{
		$this->cls('Img_Optm')->wp_update_attachment_metadata($data, $post_id);
		return $data;
	}

	/**
	 * Run litespeed admin actions
	 *
	 * @since 1.1.0
	 */
	private function _proceed_admin_action()
	{
		// handle actions
		switch (Router::get_action()) {
			case Router::ACTION_SAVE_SETTINGS:
				$this->cls('Admin_Settings')->save($_POST);
				break;

			// Save network settings
			case Router::ACTION_SAVE_SETTINGS_NETWORK:
				$this->cls('Admin_Settings')->network_save($_POST);
				break;

			default:
				break;
		}
	}

	/**
	 * Clean up the input string of any extra slashes/spaces.
	 *
	 * @since 1.0.4
	 * @access public
	 * @param string $input The input string to clean.
	 * @return string The cleaned up input.
	 */
	public static function cleanup_text($input)
	{
		if (is_array($input)) {
			return array_map(__CLASS__ . '::cleanup_text', $input);
		}

		return stripslashes(trim($input));
	}

	/**
	 * After a LSCWP_CTRL action, need to redirect back to the same page
	 * without the nonce and action in the query string.
	 *
	 * If the redirect url cannot be determined, redirects to the homepage.
	 *
	 * @since 1.0.12
	 * @access public
	 * @global string $pagenow
	 */
	public static function redirect($url = false)
	{
		global $pagenow;

		if (!empty($_GET['_litespeed_ori'])) {
			wp_safe_redirect(wp_get_referer() ?: get_home_url());
			exit();
		}

		$qs = '';
		if (!$url) {
			if (!empty($_GET)) {
				if (isset($_GET[Router::ACTION])) {
					unset($_GET[Router::ACTION]);
				}
				if (isset($_GET[Router::NONCE])) {
					unset($_GET[Router::NONCE]);
				}
				if (isset($_GET[Router::TYPE])) {
					unset($_GET[Router::TYPE]);
				}
				if (isset($_GET['litespeed_i'])) {
					unset($_GET['litespeed_i']);
				}
				if (!empty($_GET)) {
					$qs = '?' . http_build_query($_GET);
				}
			}
			if (is_network_admin()) {
				$url = network_admin_url($pagenow . $qs);
			} else {
				$url = admin_url($pagenow . $qs);
			}
		}

		wp_redirect($url);
		exit();
	}
}
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