Elep

<?php

/**
 * The plugin cache-control class for X-Litespeed-Cache-Control
 *
 * @since      	1.1.3
 * @package    	LiteSpeed
 * @subpackage 	LiteSpeed/inc
 * @author     	LiteSpeed Technologies <info@litespeedtech.com>
 */

namespace LiteSpeed;

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

class Control extends Root
{
	const LOG_TAG = '💵';

const BM_CACHEABLE = 1;
	const BM_PRIVATE = 2;
	const BM_SHARED = 4;
	const BM_NO_VARY = 8;
	const BM_FORCED_CACHEABLE = 32;
	const BM_PUBLIC_FORCED = 64;
	const BM_STALE = 128;
	const BM_NOTCACHEABLE = 256;

const X_HEADER = 'X-LiteSpeed-Cache-Control';

protected static $_control = 0;
	protected static $_custom_ttl = 0;

private $_response_header_ttls = array();

/**
	 * Init cache control
	 *
	 * @since  1.6.2
	 */
	public function init()
	{
		/**
		 * Add vary filter for Role Excludes
		 * @since  1.6.2
		 */
		add_filter('litespeed_vary', array($this, 'vary_add_role_exclude'));

// 301 redirect hook
		add_filter('wp_redirect', array($this, 'check_redirect'), 10, 2);

// Load response header conf
		$this->_response_header_ttls = $this->conf(Base::O_CACHE_TTL_STATUS);
		foreach ($this->_response_header_ttls as $k => $v) {
			$v = explode(' ', $v);
			if (empty($v[0]) || empty($v[1])) {
				continue;
			}
			$this->_response_header_ttls[$v[0]] = $v[1];
		}

if ($this->conf(Base::O_PURGE_STALE)) {
			$this->set_stale();
		}
	}

/**
	 * Exclude role from optimization filter
	 *
	 * @since  1.6.2
	 * @access public
	 */
	public function vary_add_role_exclude($vary)
	{
		if ($this->in_cache_exc_roles()) {
			$vary['role_exclude_cache'] = 1;
		}

return $vary;
	}

/**
	 * Check if one user role is in exclude cache group settings
	 *
	 * @since 1.6.2
	 * @since 3.0 Moved here from conf.cls
	 * @access public
	 * @param  string $role The user role
	 * @return int       The set value if already set
	 */
	public function in_cache_exc_roles($role = null)
	{
		// Get user role
		if ($role === null) {
			$role = Router::get_role();
		}

if (!$role) {
			return false;
		}

$roles = explode(',', $role);
		$found = array_intersect($roles, $this->conf(Base::O_CACHE_EXC_ROLES));

return $found ? implode(',', $found) : false;
	}

/**
	 * 1. Initialize cacheable status for `wp` hook
	 * 2. Hook error page tags for cacheable pages
	 *
	 * @since 1.1.3
	 * @access public
	 */
	public function init_cacheable()
	{
		// Hook `wp` to mark default cacheable status
		// NOTE: Any process that does NOT run into `wp` hook will not get cacheable by default
		add_action('wp', array($this, 'set_cacheable'), 5);

// Hook WP REST to be cacheable
		if ($this->conf(Base::O_CACHE_REST)) {
			add_action('rest_api_init', array($this, 'set_cacheable'), 5);
		}

// Cache resources
		// NOTE: If any strange resource doesn't use normal WP logic `wp_loaded` hook, rewrite rule can handle it
		$cache_res = $this->conf(Base::O_CACHE_RES);
		if ($cache_res) {
			$uri = esc_url($_SERVER['REQUEST_URI']); // todo: check if need esc_url()
			$pattern = '!' . LSCWP_CONTENT_FOLDER . Htaccess::RW_PATTERN_RES . '!';
			if (preg_match($pattern, $uri)) {
				add_action('wp_loaded', array($this, 'set_cacheable'), 5);
			}
		}

// Check error page
		add_filter('status_header', array($this, 'check_error_codes'), 10, 2);
	}

/**
	 * Check if the page returns any error code.
	 *
	 * @since 1.0.13.1
	 * @access public
	 * @param $status_header
	 * @param $code
	 * @return $eror_status
	 */
	public function check_error_codes($status_header, $code)
	{
		if (array_key_exists($code, $this->_response_header_ttls)) {
			if (self::is_cacheable() && !$this->_response_header_ttls[$code]) {
				self::set_nocache('[Ctrl] TTL is set to no cache [status_header] ' . $code);
			}

// Set TTL
			self::set_custom_ttl($this->_response_header_ttls[$code]);
		} elseif (self::is_cacheable()) {
			if (substr($code, 0, 1) == 4 || substr($code, 0, 1) == 5) {
				self::set_nocache('[Ctrl] 4xx/5xx default to no cache [status_header] ' . $code);
			}
		}

// Set cache tag
		Tag::add(Tag::TYPE_HTTP . $code);

// Give the default status_header back
		return $status_header;
	}

/**
	 * Set no vary setting
	 *
	 * @access public
	 * @since 1.1.3
	 */
	public static function set_no_vary()
	{
		if (self::is_no_vary()) {
			return;
		}
		self::$_control |= self::BM_NO_VARY;
		Debug2::debug('[Ctrl] X Cache_control -> no-vary', 3);
	}

/**
	 * Get no vary setting
	 *
	 * @access public
	 * @since 1.1.3
	 */
	public static function is_no_vary()
	{
		return self::$_control & self::BM_NO_VARY;
	}

/**
	 * Set stale
	 *
	 * @access public
	 * @since 1.1.3
	 */
	public function set_stale()
	{
		if (self::is_stale()) {
			return;
		}
		self::$_control |= self::BM_STALE;
		Debug2::debug('[Ctrl] X Cache_control -> stale');
	}

/**
	 * Get stale
	 *
	 * @access public
	 * @since 1.1.3
	 */
	public static function is_stale()
	{
		return self::$_control & self::BM_STALE;
	}

/**
	 * Set cache control to shared private
	 *
	 * @access public
	 * @since 1.1.3
	 * @param string $reason The reason to no cache
	 */
	public static function set_shared($reason = false)
	{
		if (self::is_shared()) {
			return;
		}
		self::$_control |= self::BM_SHARED;
		self::set_private();