/**
* check if js or css files have changed and return all js/css as one big file or return "HTTP/1.0 304 Not Modified" if files don't have changed
*
* @param string $_fileType
* @param array $filesToWatch
*/
protected function _deliverChangedFiles($_fileType, $filesToWatch = null)
{
// close session to allow other requests
Tinebase_Session::writeClose(true);
$config = Tinebase_Config::getInstance();
$cacheId = null;
$clientETag = null;
$ifModifiedSince = null;
if (isset($_SERVER['If_None_Match'])) {
$clientETag = trim($_SERVER['If_None_Match'], '"');
$ifModifiedSince = trim($_SERVER['If_Modified_Since'], '"');
} elseif (isset($_SERVER['HTTP_IF_NONE_MATCH'])) {
$clientETag = trim($_SERVER['HTTP_IF_NONE_MATCH'], '"');
$ifModifiedSince = trim($_SERVER['HTTP_IF_MODIFIED_SINCE'], '"');
}
$filesToWatch = $filesToWatch ? $filesToWatch : $this->_getFilesToWatch($_fileType);
if ($_fileType == 'js' && TINE20_BUILDTYPE != 'DEVELOPMENT') {
$customJSFiles = Tinebase_Config::getInstance()->get(Tinebase_Config::FAT_CLIENT_CUSTOM_JS);
if (!empty($customJSFiles)) {
$filesToWatch = array_merge($filesToWatch, (array) $customJSFiles);
}
}
$lastModified = $this->_getLastModified($filesToWatch);
// use last modified time also
$serverETag = hash('sha1', implode('', $filesToWatch) . $lastModified);
$cache = new Zend_Cache_Frontend_File(array('master_files' => $filesToWatch));
$cache->setBackend(Tinebase_Core::get(Tinebase_Core::CACHE)->getBackend());
if ($clientETag && $ifModifiedSince) {
$cacheId = __CLASS__ . "_" . __FUNCTION__ . hash('sha1', $clientETag . $ifModifiedSince);
}
// cache for 60 seconds
$maxAge = 60;
header('Cache-Control: private, max-age=' . $maxAge);
header("Expires: " . gmdate('D, d M Y H:i:s', Tinebase_DateTime::now()->addSecond($maxAge)->getTimestamp()) . " GMT");
// overwrite Pragma header from session
header("Pragma: cache");
// if the cache id is still valid, the files don't have changed on disk
if ($clientETag == $serverETag && $cache->test($cacheId)) {
header("Last-Modified: " . $ifModifiedSince);
header("HTTP/1.0 304 Not Modified");
header('Content-Length: 0');
} else {
// get new cacheId
$cacheId = __CLASS__ . "_" . __FUNCTION__ . hash('sha1', $serverETag . $lastModified);
// do we need to update the cache? maybe the client did not send an etag
if (!$cache->test($cacheId)) {
$cache->save(TINE20_BUILDTYPE, $cacheId, array(), null);
}
header("Last-Modified: " . $lastModified);
header('Content-Type: ' . ($_fileType == 'css' ? 'text/css' : 'application/javascript'));
header('Etag: "' . $serverETag . '"');
flush();
// send files to client
foreach ($filesToWatch as $file) {
readfile($file);
}
}
}
