From 49c25e4dc4f3f63e21f0030d01d7f6b93dae94e8 Mon Sep 17 00:00:00 2001
From: Dmitriy Pankratov <7snack7@gmail.com>
Date: Mon, 27 Jul 2026 15:57:58 +0700
Subject: [PATCH] feat(preview): add embedded preview support for CorelDRAW
 files

Signed-off-by: Dmitriy Pankratov <7snack7@gmail.com>
---
 lib/composer/composer/autoload_classmap.php |  1 +
 lib/composer/composer/autoload_static.php   |  1 +
 lib/private/Preview/CDR.php                 | 89 +++++++++++++++++++++
 lib/private/PreviewManager.php              |  3 +
 4 files changed, 94 insertions(+)
 create mode 100644 lib/private/Preview/CDR.php

diff --git a/lib/composer/composer/autoload_classmap.php b/lib/composer/composer/autoload_classmap.php
index beafb4700c69d..6b1fbb7cc55f3 100644
--- a/lib/composer/composer/autoload_classmap.php
+++ b/lib/composer/composer/autoload_classmap.php
@@ -2072,6 +2072,7 @@
     'OC\\Preview\\BackgroundCleanupJob' => $baseDir . '/lib/private/Preview/BackgroundCleanupJob.php',
     'OC\\Preview\\Bitmap' => $baseDir . '/lib/private/Preview/Bitmap.php',
     'OC\\Preview\\Bundled' => $baseDir . '/lib/private/Preview/Bundled.php',
+    'OC\\Preview\\CDR' => $baseDir . '/lib/private/Preview/CDR.php',
     'OC\\Preview\\Db\\Preview' => $baseDir . '/lib/private/Preview/Db/Preview.php',
     'OC\\Preview\\Db\\PreviewMapper' => $baseDir . '/lib/private/Preview/Db/PreviewMapper.php',
     'OC\\Preview\\EMF' => $baseDir . '/lib/private/Preview/EMF.php',
diff --git a/lib/composer/composer/autoload_static.php b/lib/composer/composer/autoload_static.php
index e024c1fb44b9f..6eececdd44728 100644
--- a/lib/composer/composer/autoload_static.php
+++ b/lib/composer/composer/autoload_static.php
@@ -2113,6 +2113,7 @@ class ComposerStaticInit749170dad3f5e7f9ca158f5a9f04f6a2
         'OC\\Preview\\BackgroundCleanupJob' => __DIR__ . '/../../..' . '/lib/private/Preview/BackgroundCleanupJob.php',
         'OC\\Preview\\Bitmap' => __DIR__ . '/../../..' . '/lib/private/Preview/Bitmap.php',
         'OC\\Preview\\Bundled' => __DIR__ . '/../../..' . '/lib/private/Preview/Bundled.php',
+        'OC\\Preview\\CDR' => __DIR__ . '/../../..' . '/lib/private/Preview/CDR.php',
         'OC\\Preview\\Db\\Preview' => __DIR__ . '/../../..' . '/lib/private/Preview/Db/Preview.php',
         'OC\\Preview\\Db\\PreviewMapper' => __DIR__ . '/../../..' . '/lib/private/Preview/Db/PreviewMapper.php',
         'OC\\Preview\\EMF' => __DIR__ . '/../../..' . '/lib/private/Preview/EMF.php',
diff --git a/lib/private/Preview/CDR.php b/lib/private/Preview/CDR.php
new file mode 100644
index 0000000000000..19aa04da4cb49
--- /dev/null
+++ b/lib/private/Preview/CDR.php
@@ -0,0 +1,89 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2016-2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-FileCopyrightText: 2016 ownCloud, Inc.
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+namespace OC\Preview;
+
+use OCP\Files\File;
+use OCP\Files\FileInfo;
+use OCP\IImage;
+use OCP\Image;
+
+class CDR extends ProviderV2 {
+	#[\Override]
+	public function getMimeType(): string {
+		return '/application\/coreldraw/';
+	}
+	#[\Override]
+	public function isAvailable(FileInfo $file): bool {
+		return $file->getSize() > 0;
+	}
+	#[\Override]
+	public function getThumbnail(File $file, int $maxX, int $maxY): ?IImage {
+		if (!$this->isAvailable($file)) {
+			return null;
+		}
+
+		$localFile = $this->getLocalFile($file);
+
+		if ($localFile === false) {
+			return null;
+		}
+
+		$data = $this->extractThumbnail($localFile);
+		if ($data === null) {
+			return null;
+		}
+
+		$image = new Image();
+		$image->loadFromData($data);
+
+		if (!$image->valid()) {
+			return null;
+		}
+
+		$image->scaleDownToFit($maxX, $maxY);
+
+		return $image;
+	}
+	/** * Extract ONLY thumbnail (no pages) */
+	private function extractThumbnail(string $file): ?string {
+		$zip = new \ZipArchive();
+
+		if ($zip->open($file) !== true) {
+			return null;
+		}
+
+		/**
+		 * Newer CorelDRAW files store the embedded preview in previews/thumbnail.png.
+		 *
+		 * Older CorelDRAW files store the embedded BMP thumbnail in
+		 * metadata/thumbnails/thumbnail.bmp.
+		 */
+		foreach ([
+			'previews/thumbnail.png',
+			'metadata/thumbnails/thumbnail.bmp',
+		] as $thumbnail) {
+			$idx = $zip->locateName($thumbnail);
+
+			if ($idx === false) {
+				continue;
+			}
+
+			$data = $zip->getFromIndex($idx);
+			$zip->close();
+
+			return $data === false ? null : $data;
+		}
+
+		$zip->close();
+
+		return null;
+	}
+}
diff --git a/lib/private/PreviewManager.php b/lib/private/PreviewManager.php
index f1621d7973887..0dbdb79e5299d 100644
--- a/lib/private/PreviewManager.php
+++ b/lib/private/PreviewManager.php
@@ -11,6 +11,7 @@
 use Closure;
 use OC\AppFramework\Bootstrap\Coordinator;
 use OC\Preview\BMP;
+use OC\Preview\CDR;
 use OC\Preview\Db\PreviewMapper;
 use OC\Preview\EMF;
 use OC\Preview\Font;
@@ -271,6 +272,7 @@ protected function getEnabledDefaultProvider(): array {
 			XBitmap::class,
 			Krita::class,
 			WebP::class,
+			CDR::class,
 		];
 
 		$this->defaultProviders = $this->config->getSystemValue('enabledPreviewProviders', array_merge([
@@ -317,6 +319,7 @@ protected function registerCoreProviders(): void {
 		$this->registerCoreProvider(BMP::class, '/image\/bmp/');
 		$this->registerCoreProvider(XBitmap::class, '/image\/x-xbitmap/');
 		$this->registerCoreProvider(WebP::class, '/image\/webp/');
+		$this->registerCoreProvider(CDR::class, '/application\/coreldraw/');
 		$this->registerCoreProvider(Krita::class, '/application\/x-krita/');
 		$this->registerCoreProvider(MP3::class, '/audio\/mpeg$/');
 		$this->registerCoreProvider(OpenDocument::class, '/application\/vnd.oasis.opendocument.*/');