| Current File : /home/quantums/durdanatariq.com/wp-content/plugins/sucuri-scanner/src/cachecontrol.lib.php |
<?php
/**
* Code related to the cache control headers settings.
*
* PHP version 5
*
* @category Library
* @package Sucuri
* @subpackage SucuriScanner
* @author Daniel Cid <dcid@sucuri.net>
* @copyright 2010-2018 Sucuri Inc.
* @license https://www.gnu.org/licenses/gpl-2.0.txt GPL2
* @link https://wordpress.org/plugins/sucuri-scanner
*/
if (!defined('SUCURISCAN_INIT') || SUCURISCAN_INIT !== true) {
if (!headers_sent()) {
/* Report invalid access if possible. */
header('HTTP/1.1 403 Forbidden');
}
exit(1);
}
/**
* Cache-Control library.
*
* We use this library to set the cache control headers based on the user's
* settings. The cache control headers are used to control how the browser
* and proxies cache the content of the website.
*
* Please enable site caching on your WAF to use these settings.
*
* Please note that this is an advanced feature, and we took some inspiration
* from another WordPress plugin called "cache-control", which hasn't been updated
* in a long time. We've made some improvements and added some new features,
* but we still want to give credit to the original author.
*
* @category Library
* @package Sucuri
* @subpackage SucuriScanner
* @author Daniel Cid <dcid@sucuri.net>
* @copyright 2010-2018 Sucuri Inc.
* @license https://www.gnu.org/licenses/gpl-2.0.txt GPL2
* @link https://wordpress.org/plugins/sucuri-scanner
*/
class SucuriScanCacheHeaders extends SucuriScan
{
protected function getCacheControlStaleFactor($factor, $maxAge)
{
if (is_paged() && is_int($factor) && $factor > 0) {
$multiplier = get_query_var('paged') - 1;
if ($multiplier > 0) {
$factoredMaxAge = $factor * $multiplier;
if ($factoredMaxAge >= ($maxAge * 10)) {
return $maxAge * 10;
}
return $factoredMaxAge;
}
}
return 0;
}
protected function getFuturePostMaxTime($maxTimeFuture)
{
$futurePostQuery = new WP_Query(array(
'post_status' => 'future',
'posts_per_page' => 1,
'orderby' => 'date',
'order' => 'ASC',
'ignore_sticky_posts' => 1
));
if ($futurePostQuery->have_posts()) {
$localNowTime = intval(current_time('timestamp', 0));
while ($futurePostQuery->have_posts()) {
$futurePostQuery->the_post();
$localFutureTime = get_the_time('U');
if (($localNowTime + $maxTimeFuture) > $localFutureTime) {
$maxTimeFuture = $localFutureTime - $localNowTime + rand(2, 32);
}
}
wp_reset_postdata();
}
return $maxTimeFuture;
}
protected function getCacheDirectives($maxAge, $sMaxAge, $staleError, $staleRevalidate)
{
$directive = "";
if (!empty($maxAge) && is_int($maxAge) && $maxAge > 0) {
$directive = "max-age=$maxAge";
}
if (!empty($sMaxAge) && is_int($sMaxAge) && $sMaxAge > 0 && $sMaxAge != $maxAge) {
if ($directive != "") {
$directive = "public";
}
$directive .= ", s-maxage=$sMaxAge";
}
// Append RFC 5861 headers only if the request is cacheable
if ($directive != "") {
if (!empty($staleError) && is_int($staleError) && $staleError > 0) {
$directive .= ", stale-if-error=$staleError";
}
if (!empty($staleRevalidate) && is_int($staleRevalidate) && $staleRevalidate > 0) {
$directive .= ", stale-while-revalidate=$staleRevalidate";
}
$directive = apply_filters('cache_control_cache_directive', $directive);
return $directive;
}
// Request isn't cacheable
return "no-cache, no-store, must-revalidate";
}
protected function getCacheDirectiveFromOption($optionName)
{
$cacheOptions = SucuriScanOption::getOption(':headers_cache_control_options');
$option = $cacheOptions[$optionName];
$maxAge = intval($option['max_age']);
$sMaxAge = intval($option['s_maxage']);
$staleError = intval($option['stale_if_error']);
$staleRevalidate = intval($option['stale_while_revalidate']);
// Dynamically shorten caching time when a scheduled post is imminent
if (!in_array($optionName, array('attachment_pages', 'dates', 'pages', 'singles', '404_not_found'))) {
$maxAge = $this->getFuturePostMaxTime($maxAge);
$sMaxAge = $this->getFuturePostMaxTime($sMaxAge);
}
if (is_paged() && isset($option['paged'])) {
$pageFactor = intval(get_option('cache_control_' . $option['id'] . '_paged', $option['paged']));
$maxAge += $this->getCacheControlStaleFactor($pageFactor, $maxAge);
$sMaxAge += $this->getCacheControlStaleFactor($pageFactor, $sMaxAge);
}
if ($optionName == 'singles') {
$dateNow = new DateTime();
$dateModified = new DateTime(get_the_modified_date('c'));
$lastComment = get_comments(array(
'post_id' => get_the_ID(),
'number' => 1,
'include_unapproved' => 1,
'orderby' => 'comment_date'
));
if ($lastComment != null) {
$lastCommentDate = new DateTime($lastComment[0]->comment_date);
$dateModified = max(array($dateModified, $lastCommentDate));
}
$dateDiff = $dateNow->diff($dateModified);
$monthsStale = $dateDiff->m + ($dateDiff->y * 12);
if ($monthsStale > 0) {
$maxAge = intval($maxAge * (($monthsStale + 12) / 12));
$sMaxAge = intval($sMaxAge * (($monthsStale + 12) / 12));
}
}
return $this->getCacheDirectives($maxAge, $sMaxAge, $staleError, $staleRevalidate);
}
protected function isNoCacheable()
{
global $wp_query;
$nonCacheable = is_preview() || is_user_logged_in() || is_trackback() || is_admin();
// Requires post password, and post has been unlocked.
if (!$nonCacheable && isset($wp_query->posts) && count($wp_query->posts) >= 1 &&
!empty($wp_query->posts[0]->post_password) && !post_password_required()) {
$nonCacheable = true;
} elseif (!$nonCacheable && function_exists('is_woocommerce')) {
$nonCacheable = is_cart() || is_checkout() || is_account_page();
}
return $nonCacheable;
}
protected function isWooCommerceInstalled()
{
return in_array('woocommerce/woocommerce.php',
apply_filters('active_plugins', get_option('active_plugins')));
}
protected function selectCacheDirective()
{
if ($this->isNoCacheable()) {
return $this->getCacheDirectives(false, false, false, false);
} elseif (is_feed()) {
return $this->getCacheDirectiveFromOption('feeds');
} elseif (is_front_page() && !is_paged()) {
return $this->getCacheDirectiveFromOption('front_page');
} elseif (is_single()) {
return $this->getCacheDirectiveFromOption('posts');
} elseif (is_page()) {
return $this->getCacheDirectiveFromOption('pages');
} elseif (is_home()) {
return $this->getCacheDirectiveFromOption('main_index');
} elseif (is_category()) {
return $this->getCacheDirectiveFromOption('categories');
} elseif (is_tag()) {
return $this->getCacheDirectiveFromOption('tags');
} elseif (is_author()) {
return $this->getCacheDirectiveFromOption('authors');
} elseif (is_attachment()) {
return $this->getCacheDirectiveFromOption('attachment_pages');
} elseif (is_search()) {
return $this->getCacheDirectiveFromOption('search_results');
} elseif (is_404()) {
return $this->getCacheDirectiveFromOption('404_not_found');
} elseif (is_date()) {
if ((is_year() && strcmp(get_the_time('Y'), date('Y')) < 0) ||
(is_month() && strcmp(get_the_time('Y-m'), date('Y-m')) < 0) ||
((is_day() || is_time()) && strcmp(get_the_time('Y-m-d'), date('Y-m-d')) < 0)) {
return $this->getCacheDirectiveFromOption('dates');
} else {
return $this->getCacheDirectiveFromOption('home');
}
} elseif ($this->isWooCommerceInstalled()) {
if (function_exists('is_product') && is_product()) {
return $this->getCacheDirectiveFromOption('woocommerce_product');
} elseif (function_exists('is_product_category') && is_product_category()) {
return $this->getCacheDirectiveFromOption('woocommerce_category');
}
}
return $this->getCacheDirectives(false, false, false, false);
}
protected function mergeHttpHeader($directives)
{
if (!empty($directives)) {
header("Cache-Control: $directives", true);
}
}
public function setCacheHeaders()
{
if (headers_sent()) {
// Headers are already sent; nothing to do here.
return;
}
$header = $this->selectCacheDirective();
$this->mergeHttpHeader($header);
}
}