/**
* Generates the cache for the given files.
*
* @access protected
* @param string $type
* @param string $fileName
* @return false|string
*/
protected function buildFileCache($type, $fileName)
{
if (!file_exists($fileName)) {
return false;
}
// Load the content
$content = $this->fileBackend->loadFromFile($fileName);
// Optimze the content
$content = $this->optimizeContent($type, $fileName, $content);
// Minify the content, if possible and activated
if (($type === AssetManager::CSS || $type === AssetManager::JS) && $this->minifyAssets) {
$content = $this->minifyContent($type, $content);
}
// Generate the new file name
$fileInfo = pathinfo($fileName);
$hash = $this->getHash($fileName);
$version = $fileInfo['filename'] . '-' . uniqid() . '.' . $fileInfo['extension'];
$targetFile = $this->buildFilePath($type, $hash, $version);
// Save the cached file
$this->removeOldCacheFile($fileName);
$this->fileBackend->saveToFile($content, $targetFile);
// Save the cached files in the data array
$this->cachedFiles[$hash] = array('file' => $targetFile, 'checksum' => md5_file($fileName), 'timestamp' => time());
$this->saveAssetsCache();
return $targetFile;
}
/**
* Optimizes the urls in the css content.
*
* @access protected
* @param string $content
* @param string $file
* @return string
*/
protected function optimizeUrls($content, $file)
{
preg_match_all('/url\\((.[^\\)]*)\\)/is', $content, $matches, PREG_SET_ORDER);
foreach ($matches as $match) {
$uri = $match[1];
// Remove the apostrophs
if (strpos($uri, '\'') === 0 || strpos($uri, '"') === 0) {
$uri = substr($uri, 1, -1);
}
// If the uri is an absolute url we do not change anything
if (strpos($uri, 'http') === 0) {
continue;
}
$additionalData = $this->getAdditionalUriData($uri);
$uri = $this->removeAdditionalUriData($uri);
$path = dirname($file);
$fullFilePath = realpath($path . '/' . $uri);
$fileInformation = pathinfo($fullFilePath);
$imageExtensions = array('png', 'jpg', 'jpeg', 'gif');
if (in_array($fileInformation['extension'], $imageExtensions)) {
// Load the file content
$fileContent = $this->fileBackend->loadFromFile($fullFilePath);
// Encode the file content
$encodedContent = base64_encode($fileContent);
$urlData = 'data:image/gif;base64,' . $encodedContent;
// Replace the reference in the css content
$content = str_replace($match[1], '\'' . $urlData . '\'', $content);
} else {
$type = AssetManager::BINARY;
// Cache the file
$cachedFile = $this->assetCacheManager->generateCachedFile($type, $fullFilePath);
$url = $this->assetCacheManager->getUrlToTheAssetLoader($cachedFile['file']);
// Add the additional data
if ($additionalData !== '') {
$url .= $additionalData;
}
// Replace the reference in the css content
$content = str_replace($match[1], '\'' . $url . '\'', $content);
}
}
return $content;
}
