File: /storage/v12674/lcacorpold/public_html/wp-content/plugins/cf-geoplugin/inc/classes/Cache_DB.php
<?php if ( ! defined( 'WPINC' ) ) { die( "Don't mess with us." ); }
/**
* Database Cache Control
*
* @link http://infinitumform.com/
* @since 8.0.0
* @package cf-geoplugin
* @author Ivijan-Stefan Stipic
* @version 1.0.5
*
* @todo: Hash objects for the better security.
* https://www.php.net/manual/en/function.spl-object-hash.php
*
* @todo APCu is an in-memory key-value store for PHP.
* https://www.php.net/manual/en/book.apcu.php
*
*/
if(!class_exists('CFGP_DB_Cache', false)) : class CFGP_DB_Cache {
/*
* Save all cached objcts to this variable
*/
private static $cache = [];
/*
* Main constructor
*/
private function __construct() {
if( !self::has_redis() && self::table_exists() ) {
global $wpdb;
$wpdb->query( $wpdb->prepare("DELETE FROM `{$wpdb->cfgp_cache}` WHERE `expire` != 0 AND `expire` <= %d", time() ));
}
}
/*
* Get cached object
*
* Returns the value of the cached object, or false if the cache key doesn’t exist
*/
public static function get(string $key, $default=NULL) {
$key = self::key($key);
if (isset(self::$cache[$key])) {
return self::$cache[$key];
}
global $wpdb;
if(self::has_redis()) {
$transient = wp_cache_get($key, 'CFGP_DB_Cache');
if ($transient === false) {
self::$cache[$key] = $default;
} else {
self::$cache[$key] = (is_serialized($transient) || self::is_serialized($transient)) ? unserialize($transient) : $transient;
}
}
else if(!self::table_exists()) {
$transient = get_transient($key);
self::$cache[$key] = $transient ?: $default;
}
else {
$result = $wpdb->get_var($wpdb->prepare("SELECT `{$wpdb->cfgp_cache}`.`value` FROM `{$wpdb->cfgp_cache}` WHERE `{$wpdb->cfgp_cache}`.`key` = %s", $key));
if($result) {
self::$cache[$key] = (is_serialized($result) || self::is_serialized($result)) ? unserialize($result) : $result;
} else {
self::$cache[$key] = $default;
}
}
return self::$cache[$key];
}
/*
* Save object to cache
*
* This function adds data to the cache if the cache key doesn’t already exist.
* If it does exist returns false, if not save it return NULL
*/
public static function add(string $key, $value, int $expire = 0) {
if(self::get($key, NULL) !== NULL) {
return false;
}
$key = self::key($key);
global $wpdb;
if(self::has_redis()) {
$save = wp_cache_set($key, $value, 'CFGP_DB_Cache', $expire);
}
else if(!self::table_exists()) {
$save = set_transient($key, $value, $expire);
}
else {
$expire = ($expire > 0) ? (time()+$expire) : $expire;
if(is_array($value) || is_object($value) || is_bool($value)) {
$value = serialize($value);
}
$save = $wpdb->query($wpdb->prepare("INSERT IGNORE INTO `{$wpdb->cfgp_cache}` (`key`, `value`, `expire`) VALUES (%s, %s, %d)", $key, $value, $expire));
}
if($save && !is_wp_error($save)){
self::$cache[$key] = $value;
return self::$cache[$key];
}
return NULL;
}
/*
* Save object to cache
*
* Adds data to the cache. If the cache key already exists, then it will be overwritten;
* if not then it will be created.
*/
public static function set(string $key, $value, int $expire=0) {
if( empty($value) ) {
return NULL;
}
$key = self::key($key);
if( $value == ($existing_value = self::get($key, NULL)) ) {
return $existing_value;
} else {
if( self::has_redis() ) {
if( wp_cache_set($key, $value, 'CFGP_DB_Cache', $expire) ) {
self::$cache[$key] = $value;
return self::$cache[$key];
} else {
return NULL;
}
}
if( !self::table_exists() ) {
if( set_transient( $key, $value, $expire ) ) {
self::$cache[$key] = $value;
return self::$cache[$key];
} else {
return NULL;
}
}
if( !self::add($key, $value, $expire) ) {
if( self::replace($key, $value, $expire) ) {
self::$cache[$key] = $value;
return self::$cache[$key];
}
}
}
return NULL;
}
/*
* Replace cached object
*
* Replaces the given cache if it exists, returns NULL otherwise.
*/
public static function replace(string $key, $value, int $expire=0) {
// If value is empty, delete the cache and return NULL
if(empty($value)) {
sef::delete($key);
return NULL;
}
$key = self::key($key);
global $wpdb;
// If Redis is available
if(self::has_redis()) {
$save = wp_cache_set($key, $value, 'CFGP_DB_Cache', $expire);
}
// If table doesn't exist
else if(!self::table_exists()) {
$save = set_transient($key, $value, $expire);
}
// Save to DB
else {
$expire = ($expire > 0) ? (time() + $expire) : $expire;
$value = (is_array($value) || is_object($value) || is_bool($value)) ? serialize($value) : $value;
$save = $wpdb->query($wpdb->prepare(
"UPDATE `{$wpdb->cfgp_cache}` SET `value` = %s, `expire` = %d WHERE `key` = %s",
$value, $expire, $key
));
}
// If saved successfully, update cache and return the value
if($save && !is_wp_error($save)) {
self::$cache[$key] = $value;
return self::$cache[$key];
}
return NULL;
}
/*
* Delete cached object
*
* Clears data from the cache for the given key.
*/
public static function delete(string $key) {
$key = self::key($key);
if( self::has_redis() ) {
return wp_cache_delete($key, 'CFGP_DB_Cache');
}
if( !self::table_exists() ) {
return delete_transient( $key );
}
global $wpdb;
if (array_key_exists($key, self::$cache)) {
unset(self::$cache[$key]);
}
return $wpdb->query( $wpdb->prepare("DELETE FROM `{$wpdb->cfgp_cache}` WHERE `key` = %s", $key ));
}
/*
* Clears all cached data
*/
public static function flush() {
if( self::has_redis() ) {
wp_cache_flush_group('CFGP_DB_Cache');
}
if( !self::table_exists() ) {
CFGP_U::flush_plugin_cache();
return true;
}
self::$cache = [];
global $wpdb;
return $wpdb->query("TRUNCATE TABLE `{$wpdb->cfgp_cache}`");
}
/*
* Cache key
*/
private static function key(string $key) {
$key = trim($key);
$key = stripslashes($key);
return str_replace(
array(
'.',
"\s",
"\t",
"\n",
"\r",
'\\',
'/'
),
array(
'_',
'-',
'-',
'-',
'-',
'_',
'_'
),
$key
);
}
/*
* Checks if Redis Cache is active
* @verson 1.0.1
*/
public static function has_redis() {
return CFGP_Options::get('enable_redis_cache', 0) !== 0 && extension_loaded('redis');
}
/*
* Checks if Memcache is active
* @verson 1.0.0
*/
protected static $has_memcache = NULL;
public static function has_memcache() {
if (self::$has_memcache === NULL) {
self::$has_memcache = apply_filters('cfgp_enable_memcache', true) && class_exists('Memcached', false);
}
return self::$has_memcache;
}
/*
* Check is database table exists
* @verson 1.0.0
*/
public static function table_exists($dry = false) {
static $table_exists = NULL;
global $wpdb;
if(NULL === $table_exists || $dry) {
if($wpdb->get_var( "SHOW TABLES LIKE '{$wpdb->cfgp_cache}'" ) != $wpdb->cfgp_cache) {
if( $dry ) {
return false;
}
$table_exists = false;
} else {
if( $dry ) {
return true;
}
$table_exists = true;
}
}
return $table_exists;
}
/*
* Install missing tables
* @verson 1.0.0
*/
public static function table_install() {
if( !self::table_exists(true) ) {
global $wpdb;
// Include important library
if(!function_exists('dbDelta')){
require_once ABSPATH . DIRECTORY_SEPARATOR . 'wp-admin' . DIRECTORY_SEPARATOR . 'includes' . DIRECTORY_SEPARATOR . 'upgrade.php';
}
// Install table
$charset_collate = $wpdb->get_charset_collate();
dbDelta("
CREATE TABLE IF NOT EXISTS {$wpdb->cfgp_cache} (
`key` varchar(255) NOT NULL,
`value` longtext NOT NULL,
`expire` int(11) NOT NULL DEFAULT 0,
UNIQUE KEY `cache_key` (`key`),
KEY `cache_expire` (`expire`)
) {$charset_collate}
");
}
}
/*
* Check is value is serialized
* @verson 1.0.0
*/
private static function is_serialized( $data, $strict = true ) {
// If it isn't a string, it isn't serialized.
if ( ! is_string( $data ) ) {
return false;
}
$data = trim( $data );
if ( 'N;' === $data ) {
return true;
}
if ( strlen( $data ) < 4 ) {
return false;
}
if ( ':' !== $data[1] ) {
return false;
}
if ( $strict ) {
$lastc = substr( $data, -1 );
if ( ';' !== $lastc && '}' !== $lastc ) {
return false;
}
} else {
$semicolon = strpos( $data, ';' );
$brace = strpos( $data, '}' );
// Either ; or } must exist.
if ( false === $semicolon && false === $brace ) {
return false;
}
// But neither must be in the first X characters.
if ( false !== $semicolon && $semicolon < 3 ) {
return false;
}
if ( false !== $brace && $brace < 4 ) {
return false;
}
}
$token = $data[0];
switch ( $token ) {
case 's':
if ( $strict ) {
if ( '"' !== substr( $data, -2, 1 ) ) {
return false;
}
} elseif ( false === strpos( $data, '"' ) ) {
return false;
}
// Or else fall through.
case 'a':
case 'O':
return (bool) preg_match( "/^{$token}:[0-9]+:/s", $data );
case 'b':
case 'i':
case 'd':
$end = $strict ? '$' : '';
return (bool) preg_match( "/^{$token}:[0-9.E+-]+;{$end}/", $data );
}
return false;
}
/*
* Instance
* @verson 1.0.0
*/
public static function instance() {
$class = self::class;
$instance = CFGP_Cache::get($class);
if ( !$instance ) {
$instance = CFGP_Cache::set($class, new self());
}
return $instance;
}
} endif;