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<?php |
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namespace AssetManager\View\Helper; |
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use AssetManager\Core\Resolver\ResolverInterface; |
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use Zend\Cache\Storage\Adapter\AbstractAdapter as AbstractCacheAdapter; |
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use Zend\View\Helper\AbstractHelper; |
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class Asset extends AbstractHelper |
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{ |
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/** |
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* @var array |
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*/ |
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private $config; |
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/** @var null|AbstractCacheAdapter */ |
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private $cache; |
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/** |
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* @var ResolverInterface |
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*/ |
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private $assetManagerResolver; |
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/** |
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* @param ResolverInterface $assetManagerResolver |
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* @param AbstractCacheAdapter|null $cache |
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* @param array $config |
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*/ |
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public function __construct(ResolverInterface $assetManagerResolver, $cache, $config) |
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{ |
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$this->assetManagerResolver = $assetManagerResolver; |
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$this->cache = $cache; |
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$this->config = $config; |
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} |
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/** |
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* Append timestamp as query param to the filename |
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* |
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* @param string $filename |
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* @param string $queryString |
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* @param int|null $timestamp |
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* |
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* @return string |
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*/ |
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private function appendTimestamp($filename, $queryString, $timestamp = null) |
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{ |
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// current timestamp as default |
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$timestamp = $timestamp === null ? time() : $timestamp; |
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return $filename . '?' . urlencode($queryString) . '=' . $timestamp; |
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} |
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/** |
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* find the file and if it exists, append its unix modification time to the filename |
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* |
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* @param string $filename |
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* @param string $queryString |
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* @return string |
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*/ |
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private function elaborateFilePath($filename, $queryString) |
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{ |
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$asset = $this->assetManagerResolver->resolve($filename); |
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if ($asset !== null) { |
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// append last modified date to the filepath and use a custom query string |
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return $this->appendTimestamp($filename, $queryString, $asset->getLastModified()); |
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} |
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return $filename; |
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} |
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/** |
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* Use the cache to get the filePath |
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* |
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* @param string $filename |
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* @param string $queryString |
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* |
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* @return mixed|string |
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*/ |
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private function getFilePathFromCache($filename, $queryString) |
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{ |
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// return if cache not found |
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if ($this->cache == null) { |
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return null; |
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} |
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// cache key based on the filename |
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$cacheKey = md5($filename); |
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$itemIsFoundInCache = false; |
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$filePath = $this->cache->getItem($cacheKey, $itemIsFoundInCache); |
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// if there is no element in the cache, elaborate and cache it |
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if ($itemIsFoundInCache === false || $filePath === null) { |
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$filePath = $this->elaborateFilePath($filename, $queryString); |
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$this->cache->setItem($cacheKey, $filePath); |
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} |
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return $filePath; |
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} |
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/** |
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* Output the filepath with its unix modification time as query param |
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* |
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* @param string $filename |
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* @return string |
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*/ |
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public function __invoke($filename) |
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{ |
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// nothing to append |
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if (empty($this->config['view_helper']['append_timestamp'])) { |
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return $filename; |
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} |
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// search the cache config for the specific file requested (if none, use the default one) |
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if (isset($this->config['caching'][$filename])) { |
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$cacheConfig = $this->config['caching'][$filename]; |
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} elseif (isset($this->config['caching']['default'])) { |
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$cacheConfig = $this->config['caching']['default']; |
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} |
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// query string params |
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$queryString = isset($this->config['view_helper']['query_string']) |
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? $this->config['view_helper']['query_string'] |
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: '_'; |
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// no cache dir is defined |
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if (!isset($cacheConfig['options']['dir'])) { |
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// append current timestamp to the filepath and use a custom query string |
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return $this->appendTimestamp($filename, $queryString); |
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} |
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// get the filePath from the cache (if available) |
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$filePath = $this->getFilePathFromCache($filename, $queryString); |
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if ($filePath !== null) { |
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return $filePath; |
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} |
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return $this->elaborateFilePath($filename, $queryString); |
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} |
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} |
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wshafer /
AssetManager
