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<?php
declare(strict_types=1);
/**
* SPDX-FileCopyrightText: 2019 Nextcloud GmbH and Nextcloud contributors
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
namespace OC\Preview;
use OCP\Files\File;
use OCP\Files\FileInfo;
use OCP\IImage;
use OCP\Preview\IProviderV2;
abstract class ProviderV2 implements IProviderV2 {
/** @var array */
protected $options;
/** @var array */
protected $tmpFiles = [];
/**
* Constructor
*
* @param array $options
*/
public function __construct(array $options = []) {
$this->options = $options;
}
/**
* @return string Regex with the mimetypes that are supported by this provider
*/
abstract public function getMimeType(): string ;
/**
* Check if a preview can be generated for $path
*
* @param FileInfo $file
* @return bool
*/
public function isAvailable(FileInfo $file): bool {
return true;
}
/**
* get thumbnail for file at path $path
*
* @param File $file
* @param int $maxX The maximum X size of the thumbnail. It can be smaller depending on the shape of the image
* @param int $maxY The maximum Y size of the thumbnail. It can be smaller depending on the shape of the image
* @return null|\OCP\IImage false if no preview was generated
* @since 17.0.0
*/
abstract public function getThumbnail(File $file, int $maxX, int $maxY): ?IImage;
protected function useTempFile(File $file): bool {
return $file->isEncrypted() || !$file->getStorage()->isLocal();
}
/**
* Get a path to either the local file or temporary file
*
* @param File $file
* @param int $maxSize maximum size for temporary files
* @return string|false
*/
protected function getLocalFile(File $file, ?int $maxSize = null) {
if ($this->useTempFile($file)) {
$absPath = \OC::$server->getTempManager()->getTemporaryFile();
$content = $file->fopen('r');
if ($content === false) {
return false;
}
if ($maxSize) {
$content = stream_get_contents($content, $maxSize);
}
file_put_contents($absPath, $content);
$this->tmpFiles[] = $absPath;
return $absPath;
} else {
$path = $file->getStorage()->getLocalFile($file->getInternalPath());
if (is_string($path)) {
return $path;
} else {
return false;
}
}
}
/**
* Clean any generated temporary files
*/
protected function cleanTmpFiles(): void {
foreach ($this->tmpFiles as $tmpFile) {
unlink($tmpFile);
}
$this->tmpFiles = [];
}
}
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