silverstripe-framework/Assets/Flysystem/GeneratedAssetHandler.php

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<?php
namespace SilverStripe\Assets\Flysystem;
use Exception;
use League\Flysystem\Filesystem;
/**
* Simple Flysystem implementation of GeneratedAssetHandler for storing generated content
*/
class GeneratedAssetHandler implements \SilverStripe\Assets\Storage\GeneratedAssetHandler {
/**
* Flysystem store for files
*
* @var Filesystem
*/
protected $assetStore = null;
/**
* Assign the asset backend. This must be a filesystem
* with an adapter of type {@see PublicAdapter}.
*
* @param Filesystem $store
* @return $this
*/
public function setFilesystem(Filesystem $store) {
$this->assetStore = $store;
return $this;
}
/**
* Get the asset backend
*
* @return Filesystem
* @throws Exception
*/
public function getFilesystem() {
if(!$this->assetStore) {
throw new Exception("Filesystem misconfiguration error");
}
return $this->assetStore;
}
public function getContentURL($filename, $callback = null) {
$result = $this->checkOrCreate($filename, $callback);
if(!$result) {
return null;
}
/** @var PublicAdapter $adapter */
$adapter = $this
->getFilesystem()
->getAdapter();
return $adapter->getPublicUrl($filename);
}
public function getContent($filename, $callback = null) {
$result = $this->checkOrCreate($filename, $callback);
if(!$result) {
return null;
}
return $this
->getFilesystem()
->read($filename);
}
/**
* Check if the file exists or that the $callback provided was able to regenerate it.
*
* @param string $filename
* @param callable $callback
* @return bool Whether or not the file exists
* @throws Exception If an error has occurred during save
*/
protected function checkOrCreate($filename, $callback = null) {
// Check if there is an existing asset
if ($this->getFilesystem()->has($filename)) {
return true;
}
if (!$callback) {
return false;
}
// Invoke regeneration and save
$content = call_user_func($callback);
$this->setContent($filename, $content);
return true;
}
public function setContent($filename, $content) {
// Store content
$result = $this
->getFilesystem()
->put($filename, $content);
if(!$result) {
throw new Exception("Error regenerating file \"{$filename}\"");
}
}
public function removeContent($filename) {
if($this->getFilesystem()->has($filename)) {
$handler = $this->getFilesystem()->get($filename);
$handler->delete();
}
}
}