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<?php
if ( ! defined( 'ABSPATH' ) ) {
exit; // Exit if accessed directly
}
/**
* WC_Cache_Helper class.
*
* @class WC_Cache_Helper
* @version 2.2.0
* @package WooCommerce/Classes
* @category Class
* @author WooThemes
*/
class WC_Cache_Helper {
/**
* Hook in methods
*/
public static function init() {
add_action( 'before_woocommerce_init', array( __CLASS__, 'prevent_caching' ) );
add_action( 'admin_notices', array( __CLASS__, 'notices' ) );
}
/**
* Get transient version
*
* When using transients with unpredictable names, e.g. those containing an md5
* hash in the name, we need a way to invalidate them all at once.
*
* When using default WP transients we're able to do this with a DB query to
* delete transients manually.
*
* With external cache however, this isn't possible. Instead, this function is used
* to append a unique string (based on time()) to each transient. When transients
* are invalidated, the transient version will increment and data will be regenerated.
*
* Raised in issue https://github.com/woothemes/woocommerce/issues/5777
* Adapted from ideas in http://tollmanz.com/invalidation-schemes/
*
* @param string $group Name for the group of transients we need to invalidate
* @param boolean $refresh true to force a new version
* @return string transient version based on time(), 10 digits
*/
public static function get_transient_version( $group, $refresh = false ) {
$transient_name = $group . '-transient-version';
$transient_value = get_transient( $transient_name );
if ( false === $transient_value || true === $refresh ) {
$transient_value = time();
set_transient( $transient_name, $transient_value );
}
return $transient_value;
}
/**
* Prevent caching on dynamic pages.
*
* @access public
* @return void
*/
public static function prevent_caching() {
if ( false === ( $wc_page_uris = get_transient( 'woocommerce_cache_excluded_uris' ) ) ) {
$wc_page_uris = array();
// Exclude querystring when using page ID and permalinks
if ( ( $cart_page_id = wc_get_page_id( 'cart' ) ) && $cart_page_id > 0 ) {
$wc_page_uris[] = 'p=' . $cart_page_id;
$page = get_post( $cart_page_id );
if ( ! is_null( $page ) ) {
$wc_page_uris[] = '/' . $page->post_name;
}
}
if ( ( $checkout_page_id = wc_get_page_id( 'checkout' ) ) && $checkout_page_id > 0 ) {
$wc_page_uris[] = 'p=' . $checkout_page_id;
$page = get_post( $checkout_page_id );
if ( ! is_null( $page ) ) {
$wc_page_uris[] = '/' . $page->post_name;
}
}
if ( ( $myaccount_page_id = wc_get_page_id( 'myaccount' ) ) && $myaccount_page_id > 0 ) {
$wc_page_uris[] = 'p=' . $myaccount_page_id;
$page = get_post( $myaccount_page_id );
if ( ! is_null( $page ) ) {
$wc_page_uris[] = '/' . $page->post_name;
}
}
set_transient( 'woocommerce_cache_excluded_uris', $wc_page_uris );
}
if ( is_array( $wc_page_uris ) ) {
foreach( $wc_page_uris as $uri ) {
if ( strstr( $_SERVER['REQUEST_URI'], $uri ) ) {
self::nocache();
break;
}
}
}
}
/**
* Set nocache constants and headers.
*
* @access private
* @return void
*/
private static function nocache() {
if ( ! defined( 'DONOTCACHEPAGE' ) )
define( "DONOTCACHEPAGE", "true" );
if ( ! defined( 'DONOTCACHEOBJECT' ) )
define( "DONOTCACHEOBJECT", "true" );
if ( ! defined( 'DONOTCACHEDB' ) )
define( "DONOTCACHEDB", "true" );
nocache_headers();
}
/**
* notices function.
*
* @access public
* @return void
*/
public static function notices() {
if ( ! function_exists( 'w3tc_pgcache_flush' ) || ! function_exists( 'w3_instance' ) ) {
return;
}
$config = w3_instance('W3_Config');
$enabled = $config->get_integer( 'dbcache.enabled' );
$settings = array_map( 'trim', $config->get_array( 'dbcache.reject.sql' ) );
if ( $enabled && ! in_array( '_wc_session_', $settings ) ) {
?>
<div class="error">
<p><?php printf( __( 'In order for <strong>database caching</strong> to work with WooCommerce you must add <code>_wc_session_</code> to the "Ignored Query Strings" option in W3 Total Cache settings <a href="%s">here</a>.', 'woocommerce' ), admin_url( 'admin.php?page=w3tc_dbcache' ) ); ?></p>
</div>
<?php
}
}
}
WC_Cache_Helper::init();
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