1 files changed, 105 insertions, 0 deletions
diff --git a/lib/private/Preview/ProviderV2.php b/lib/private/Preview/ProviderV2.php
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+++ b/lib/private/Preview/ProviderV2.php
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+<?php declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2019 Robin Appelman <robin@icewind.nl>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OC\Preview;
+
+use OCP\Files\File;
+use OCP\Files\FileInfo;
+use OCP\IImage;
+use OCP\Preview\IProviderV2;
+
+abstract class ProviderV2 implements IProviderV2 {
+	private $options;
+
+	private $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;
+
+	/**
+	 * Get a path to either the local file or temporary file
+	 *
+	 * @param File $file
+	 * @param int $maxSize maximum size for temporary files
+	 * @return string
+	 */
+	protected function getLocalFile(File $file, int $maxSize = null): string {
+		$useTempFile = $file->isEncrypted() || !$file->getStorage()->isLocal();
+		if ($useTempFile) {
+			$absPath = \OC::$server->getTempManager()->getTemporaryFile();
+
+			$content = $file->fopen('r');
+
+			if ($maxSize) {
+				$content = stream_get_contents($content, $maxSize);
+			}
+
+			file_put_contents($absPath, $content);
+			$this->tmpFiles[] = $absPath;
+			return $absPath;
+		} else {
+			return $file->getStorage()->getLocalFile($file->getInternalPath());
+		}
+	}
+
+	/**
+	 * Clean any generated temporary files
+	 */
+	protected function cleanTmpFiles() {
+		foreach ($this->tmpFiles as $tmpFile) {
+			unlink($tmpFile);
+		}
+
+		$this->tmpFiles = [];
+	}
+}