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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Asset\VersionStrategy;
/**
* Reads the versioned path of an asset from a JSON manifest file.
*
* For example, the manifest file might look like this:
* {
* "main.js": "main.abc123.js",
* "css/styles.css": "css/styles.555abc.css"
* }
*
* You could then ask for the version of "main.js" or "css/styles.css".
*/
class JsonManifestVersionStrategy implements VersionStrategyInterface
{
private $manifestPath;
private $manifestData;
/**
* @param string $manifestPath Absolute path to the manifest file
*/
public function __construct(string $manifestPath)
{
$this->manifestPath = $manifestPath;
}
/**
* With a manifest, we don't really know or care about what
* the version is. Instead, this returns the path to the
* versioned file.
*/
public function getVersion($path)
{
return $this->applyVersion($path);
}
public function applyVersion($path)
{
return $this->getManifestPath($path) ?: $path;
}
private function getManifestPath(string $path): ?string
{
if (null === $this->manifestData) {
if (!file_exists($this->manifestPath)) {
throw new \RuntimeException(sprintf('Asset manifest file "%s" does not exist.', $this->manifestPath));
}
$this->manifestData = json_decode(file_get_contents($this->manifestPath), true);
if (0 < json_last_error()) {
throw new \RuntimeException(sprintf('Error parsing JSON from asset manifest file "%s": ', $this->manifestPath).json_last_error_msg());
}
}
return $this->manifestData[$path] ?? null;
}
}