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122 lines
3.1 KiB
PHP
122 lines
3.1 KiB
PHP
<?php
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declare(strict_types=1);
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/**
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* @copyright Copyright (c) 2019 Robin Appelman <robin@icewind.nl>
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*
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* @author Robin Appelman <robin@icewind.nl>
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*
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* @license GNU AGPL version 3 or any later version
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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namespace OC\Preview;
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use OCP\Files\File;
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use OCP\Files\FileInfo;
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use OCP\IImage;
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use OCP\Preview\IProviderV2;
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abstract class ProviderV2 implements IProviderV2 {
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/** @var array */
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protected $options;
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/** @var array */
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protected $tmpFiles = [];
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/**
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* Constructor
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*
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* @param array $options
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*/
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public function __construct(array $options = []) {
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$this->options = $options;
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}
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/**
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* @return string Regex with the mimetypes that are supported by this provider
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*/
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abstract public function getMimeType(): string ;
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/**
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* Check if a preview can be generated for $path
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*
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* @param FileInfo $file
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* @return bool
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*/
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public function isAvailable(FileInfo $file): bool {
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return true;
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}
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/**
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* get thumbnail for file at path $path
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*
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* @param File $file
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* @param int $maxX The maximum X size of the thumbnail. It can be smaller depending on the shape of the image
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* @param int $maxY The maximum Y size of the thumbnail. It can be smaller depending on the shape of the image
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* @return null|\OCP\IImage false if no preview was generated
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* @since 17.0.0
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*/
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abstract public function getThumbnail(File $file, int $maxX, int $maxY): ?IImage;
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protected function useTempFile(File $file): bool {
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return $file->isEncrypted() || !$file->getStorage()->isLocal();
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}
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/**
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* Get a path to either the local file or temporary file
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*
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* @param File $file
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* @param int $maxSize maximum size for temporary files
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* @return string|false
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*/
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protected function getLocalFile(File $file, ?int $maxSize = null) {
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if ($this->useTempFile($file)) {
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$absPath = \OC::$server->getTempManager()->getTemporaryFile();
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$content = $file->fopen('r');
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if ($content === false) {
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return false;
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}
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if ($maxSize) {
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$content = stream_get_contents($content, $maxSize);
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}
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file_put_contents($absPath, $content);
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$this->tmpFiles[] = $absPath;
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return $absPath;
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} else {
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$path = $file->getStorage()->getLocalFile($file->getInternalPath());
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if (is_string($path)) {
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return $path;
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} else {
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return false;
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}
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}
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}
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/**
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* Clean any generated temporary files
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*/
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protected function cleanTmpFiles(): void {
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foreach ($this->tmpFiles as $tmpFile) {
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unlink($tmpFile);
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}
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$this->tmpFiles = [];
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}
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}
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