Merge pull request #20319 from nextcloud/enh/noid/embedded-previews

Use embedded previews of ZIP-like files

4 files changed, 129 insertions, 2 deletions

diff --git a/lib/private/Preview/Bundled.php b/lib/private/Preview/Bundled.php
new file mode 100644
index 00000000000..afd286d895b
--- /dev/null
+++ b/lib/private/Preview/Bundled.php
@@ -0,0 +1,56 @@
+<?php
+/**
+ * @copyright Copyright (c) 2020 Julius Härtl <jus@bitgrid.net>
+ *
+ * @author Julius Härtl <jus@bitgrid.net>
+ *
+ * @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 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, $path): ?IImage {
+		$sourceTmp = \OC::$server->getTempManager()->getTemporaryFile();
+		$targetTmp = \OC::$server->getTempManager()->getTemporaryFile();
+
+		try {
+			$content = $file->fopen('r');
+			file_put_contents($sourceTmp, $content);
+
+			$zip = new ZIP($sourceTmp);
+			$zip->extractFile($path, $targetTmp);
+
+			$image = new \OC_Image();
+			$image->loadFromFile($targetTmp);
+			$image->fixOrientation();
+
+			return $image;
+		} catch (\Exception $e) {
+			return null;
+		}
+	}
+
+}
diff --git a/lib/private/Preview/Krita.php b/lib/private/Preview/Krita.php
new file mode 100644
index 00000000000..39449145a14
--- /dev/null
+++ b/lib/private/Preview/Krita.php
@@ -0,0 +1,52 @@
+<?php
+/**
+ * @copyright Copyright (c) 2020 Julius Härtl <jus@bitgrid.net>
+ *
+ * @author Julius Härtl <jus@bitgrid.net>
+ *
+ * @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\IImage;
+
+class Krita extends Bundled {
+	/**
+	 * {@inheritDoc}
+	 */
+	public function getMimeType(): string {
+		return '/application\/x-krita/';
+	}
+
+
+	/**
+	 * @inheritDoc
+	 */
+	public function getThumbnail(File $file, int $maxX, int $maxY): ?IImage {
+		$image = $this->extractThumbnail($file, 'mergedimage.png');
+		if ($image->valid()) {
+			return $image;
+		}
+		$image = $this->extractThumbnail($file, 'preview.png');
+		if ($image->valid()) {
+			return $image;
+		}
+		return null;
+	}
+}
diff --git a/lib/private/Preview/OpenDocument.php b/lib/private/Preview/OpenDocument.php
index b795441d837..1db7b0be521 100644
--- a/lib/private/Preview/OpenDocument.php
+++ b/lib/private/Preview/OpenDocument.php
@@ -25,11 +25,26 @@
 namespace OC\Preview;
 
 //.odt, .ott, .oth, .odm, .odg, .otg, .odp, .otp, .ods, .ots, .odc, .odf, .odb, .odi, .oxt
-class OpenDocument extends Office {
+use OCP\Files\File;
+use OCP\IImage;
+
+class OpenDocument extends Bundled {
 	/**
 	 * {@inheritDoc}
 	 */
 	public function getMimeType(): string {
 		return '/application\/vnd.oasis.opendocument.*/';
 	}
+
+
+	/**
+	 * @inheritDoc
+	 */
+	public function getThumbnail(File $file, int $maxX, int $maxY): ?IImage {
+		$image = $this->extractThumbnail($file, 'Thumbnails/thumbnail.png');
+		if ($image->valid()) {
+			return $image;
+		}
+		return null;
+	}
 }
diff --git a/lib/private/PreviewManager.php b/lib/private/PreviewManager.php
index 652a442deec..adfc04199e3 100644
--- a/lib/private/PreviewManager.php
+++ b/lib/private/PreviewManager.php
@@ -293,13 +293,15 @@ class PreviewManager implements IPreview {
 			Preview\GIF::class,
 			Preview\BMP::class,
 			Preview\HEIC::class,
-			Preview\XBitmap::class
+			Preview\XBitmap::class,
+			Preview\Krita::class,
 		];
 
 		$this->defaultProviders = $this->config->getSystemValue('enabledPreviewProviders', array_merge([
 			Preview\MarkDown::class,
 			Preview\MP3::class,
 			Preview\TXT::class,
+			Preview\OpenDocument::class,
 		], $imageProviders));
 
 		if (in_array(Preview\Image::class, $this->defaultProviders)) {
@@ -339,7 +341,9 @@ class PreviewManager implements IPreview {
 		$this->registerCoreProvider(Preview\GIF::class, '/image\/gif/');
 		$this->registerCoreProvider(Preview\BMP::class, '/image\/bmp/');
 		$this->registerCoreProvider(Preview\XBitmap::class, '/image\/x-xbitmap/');
+		$this->registerCoreProvider(Preview\Krita::class, '/application\/x-krita/');
 		$this->registerCoreProvider(Preview\MP3::class, '/audio\/mpeg/');
+		$this->registerCoreProvider(Preview\OpenDocument::class, '/application\/vnd.oasis.opendocument.*/');
 
 		// SVG, Office and Bitmap require imagick
 		if (extension_loaded('imagick')) {