1 files changed, 43 insertions, 0 deletions
diff --git a/lib/private/Preview/Bundled.php b/lib/private/Preview/Bundled.php
new file mode 100644
index 00000000000..6100e8262a4
--- /dev/null
+++ b/lib/private/Preview/Bundled.php
@@ -0,0 +1,43 @@
+<?php
+
+/**
+ * SPDX-FileCopyrightText: 2020 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+namespace OC\Preview;
+
+use OC\Archive\ZIP;
+use OCP\Files\File;
+use OCP\IImage;
+
+/**
+ * Extracts a preview from files that embed them in an ZIP archive
+ */
+abstract class Bundled extends ProviderV2 {
+	protected function extractThumbnail(File $file, string $path): ?IImage {
+		if ($file->getSize() === 0) {
+			return null;
+		}
+
+		$sourceTmp = \OC::$server->getTempManager()->getTemporaryFile();
+		$targetTmp = \OC::$server->getTempManager()->getTemporaryFile();
+		$this->tmpFiles[] = $sourceTmp;
+		$this->tmpFiles[] = $targetTmp;
+
+		try {
+			$content = $file->fopen('r');
+			file_put_contents($sourceTmp, $content);
+
+			$zip = new ZIP($sourceTmp);
+			$zip->extractFile($path, $targetTmp);
+
+			$image = new \OCP\Image();
+			$image->loadFromFile($targetTmp);
+			$image->fixOrientation();
+
+			return $image;
+		} catch (\Throwable $e) {
+			return null;
+		}
+	}
+}