/**
* Register Helpers
*
* @return null
*/
public static function registerHelpers()
{
include_once 'helpers/MgCacheHelper.php';
include_once 'helpers/MgAssetHelper.php';
MgAssetHelper::init();
MgCacheHelper::init();
}
/**
*
* METHODS
*
*/
public static function init()
{
if (defined('MG_CACHE_DIR')) {
self::$cacheDir = WP_CONTENT_DIR . '/' . MG_CACHE_DIR . '/' . self::$cacheSubdir;
} else {
self::$cacheDir = WP_CONTENT_DIR . '/cache/' . self::$cacheSubdir;
}
$wpContentUrl = preg_replace('/(http|https):\\/\\/' . $_SERVER['HTTP_HOST'] . '\\/(.*)\\/wp-content/', '/wp-content', WP_CONTENT_URL);
if (defined('MG_CACHE_PATH')) {
self::$cachePath = $wpContentUrl . '/' . MG_CACHE_PATH . '/' . self::$cacheSubdir;
} else {
self::$cachePath = $wpContentUrl . '/cache/' . self::$cacheSubdir;
}
if (defined('MG_CACHE_EXTENSION')) {
self::$fileExtension = MG_CACHE_EXTENSION;
} else {
self::$fileExtension = 'cache';
}
if (defined('MG_CACHE_DRIVER')) {
self::$cacheDriver = CacheProviderFactory::build(MG_CACHE_DRIVER);
}
// ABSPATH won't work reliably if WP is installed in a subdirectory
self::$webRoot = realpath(dirname($_SERVER['SCRIPT_FILENAME'])) . '/';
if (empty(self::$webRoot)) {
self::$webRoot = ABSPATH;
}
if (defined('MG_CACHE_DRIVER')) {
self::$cacheDriver = CacheProviderFactory::build(MG_CACHE_DRIVER);
} else {
self::$cacheDriver = CacheProviderFactory::build('file');
}
// test that cache directory is writable (for windows and vagrant... which fail is_writable)
try {
$testFile = self::$cacheDir . '/__cache.txt';
$fp = fopen($testFile, 'w');
fwrite($fp, 'hello cache!');
if (!file_exists($testFile)) {
throw new \Exception();
}
MgAssetHelper::registerSettings();
MgAssetHelper::registerFilters();
} catch (\Exception $e) {
add_action('admin_notices', array('MgAssetHelper', 'adminErrorNoticeCacheDirectoryWritable'));
}
}
/**
* Asset Stylesheet Action
*
* @return null
*/
public static function assetStylesheetAction()
{
$pagename = get_query_var('pagename');
$files = get_query_var('files');
$fingerprint = get_query_var('fingerprint');
// check if on mg_asset_css page and have 'files' parameter
if ($pagename == 'mg_asset_css' && $files) {
$content = '';
$lastModified = new \DateTime('-1 year');
// initialize cached resource file location
$cachedResourceFile = MgCacheHelper::$cacheDir . '/' . $fingerprint . '.css';
// create new cached resource, save to cache directory
if (!file_exists($cachedResourceFile)) {
// turn files parameter into array
$fileArray = explode(',', $files);
if (is_array($fileArray) && count($fileArray)) {
// loop over array of files
foreach ($fileArray as $file) {
if ($stylesheetPath = realpath(MgCacheHelper::$webRoot . $file)) {
// get timestamp for most recently modified file
$localLastModified = new \DateTime(date("F d Y H:i:s", filemtime($stylesheetPath)));
if ($localLastModified > $lastModified) {
$lastModified = $localLastModified;
}
// get contents of each file while fixing asset paths
$content .= MgAssetHelper::assetContents($file);
}
}
// strip whitespace and comments from $content
if (MgAssetHelper::$minify) {
$content = preg_replace(array('/\\/\\*.*?\\*\\//s', '/\\s+/'), array('', ' '), $content);
}
}
// save contents
if (!empty($content)) {
if (!is_writable(dirname($cachedResourceFile))) {
mkdir(dirname($cachedResourceFile), 0775, true);
}
if (is_writable(dirname($cachedResourceFile))) {
file_put_contents($cachedResourceFile, $content);
}
}
}
// read cached resource to buffer
if (file_exists($cachedResourceFile)) {
ob_start();
readfile($cachedResourceFile);
$content = ob_get_contents();
ob_end_clean();
$lastModified = new \DateTime(date("F d Y H:i:s", filemtime($cachedResourceFile)));
}
// output
if (empty($content)) {
header('HTTP/1.1 404 Not Found');
} else {
header('HTTP/1.1 200 OK');
header('Content-Type: text/css');
header('Content-Length: ' . strlen($content));
header('Expires: ' . date('D, d M Y H:i:s e', strtotime('+1 year')));
header('Cache-Control: max-age=31556926');
header('Last-Modified: ' . $lastModified->format('D, d M Y H:i:s e'));
header('Date: ' . $lastModified->format('D, d M Y H:i:s e'));
header('Pragma: cache');
header('Vary: Accept-Encoding');
header('X-Content-Type-Options: nosniff');
header('Accept-Ranges: bytes');
echo $content;
}
exit;
}
}
/**
* Asset Contents
*
* @param string $file
* @return string
*/
public static function assetContents($file)
{
$return = '';
if ($stylesheetPath = realpath(MgCacheHelper::$webRoot . $file)) {
// get file info
$pathinfo = pathinfo($file);
// set local var for temp use in callback
self::$assetDirectory = $pathinfo['dirname'];
// string replacement callback
$return = preg_replace_callback('/(url\\(\\s*[\'\\"]?)(.*?)([\'\\"]?\\s*\\))/', array('MgAssetHelper', 'assetContentHandler'), file_get_contents($stylesheetPath));
}
// reset local temp var
self::$assetDirectory = null;
return $return;
}
