feat: redirect to the mime icon if no preview available

Signed-off-by: John Molakvoæ <skjnldsv@protonmail.com>

6 files changed, 148 insertions, 0 deletions

diff --git a/lib/composer/composer/autoload_classmap.php b/lib/composer/composer/autoload_classmap.php
index 2e5c239b6ed..4b99fc18135 100644
--- a/lib/composer/composer/autoload_classmap.php
+++ b/lib/composer/composer/autoload_classmap.php
@@ -533,6 +533,7 @@ return array(
     'OCP\\OCS\\IDiscoveryService' => $baseDir . '/lib/public/OCS/IDiscoveryService.php',
     'OCP\\PreConditionNotMetException' => $baseDir . '/lib/public/PreConditionNotMetException.php',
     'OCP\\Preview\\BeforePreviewFetchedEvent' => $baseDir . '/lib/public/Preview/BeforePreviewFetchedEvent.php',
+    'OCP\\Preview\\IMimeIconProvider' => $baseDir . '/lib/public/Preview/IMimeIconProvider.php',
     'OCP\\Preview\\IProvider' => $baseDir . '/lib/public/Preview/IProvider.php',
     'OCP\\Preview\\IProviderV2' => $baseDir . '/lib/public/Preview/IProviderV2.php',
     'OCP\\Preview\\IVersionedPreviewFile' => $baseDir . '/lib/public/Preview/IVersionedPreviewFile.php',
@@ -1479,6 +1480,7 @@ return array(
     'OC\\Preview\\MSOffice2007' => $baseDir . '/lib/private/Preview/MSOffice2007.php',
     'OC\\Preview\\MSOfficeDoc' => $baseDir . '/lib/private/Preview/MSOfficeDoc.php',
     'OC\\Preview\\MarkDown' => $baseDir . '/lib/private/Preview/MarkDown.php',
+    'OC\\Preview\\MimeIconProvider' => $baseDir . '/lib/private/Preview/MimeIconProvider.php',
     'OC\\Preview\\Movie' => $baseDir . '/lib/private/Preview/Movie.php',
     'OC\\Preview\\Office' => $baseDir . '/lib/private/Preview/Office.php',
     'OC\\Preview\\OpenDocument' => $baseDir . '/lib/private/Preview/OpenDocument.php',
diff --git a/lib/composer/composer/autoload_static.php b/lib/composer/composer/autoload_static.php
index 48c6701c7c6..121931b60d0 100644
--- a/lib/composer/composer/autoload_static.php
+++ b/lib/composer/composer/autoload_static.php
@@ -566,6 +566,7 @@ class ComposerStaticInit749170dad3f5e7f9ca158f5a9f04f6a2
         'OCP\\OCS\\IDiscoveryService' => __DIR__ . '/../../..' . '/lib/public/OCS/IDiscoveryService.php',
         'OCP\\PreConditionNotMetException' => __DIR__ . '/../../..' . '/lib/public/PreConditionNotMetException.php',
         'OCP\\Preview\\BeforePreviewFetchedEvent' => __DIR__ . '/../../..' . '/lib/public/Preview/BeforePreviewFetchedEvent.php',
+        'OCP\\Preview\\IMimeIconProvider' => __DIR__ . '/../../..' . '/lib/public/Preview/IMimeIconProvider.php',
         'OCP\\Preview\\IProvider' => __DIR__ . '/../../..' . '/lib/public/Preview/IProvider.php',
         'OCP\\Preview\\IProviderV2' => __DIR__ . '/../../..' . '/lib/public/Preview/IProviderV2.php',
         'OCP\\Preview\\IVersionedPreviewFile' => __DIR__ . '/../../..' . '/lib/public/Preview/IVersionedPreviewFile.php',
@@ -1512,6 +1513,7 @@ class ComposerStaticInit749170dad3f5e7f9ca158f5a9f04f6a2
         'OC\\Preview\\MSOffice2007' => __DIR__ . '/../../..' . '/lib/private/Preview/MSOffice2007.php',
         'OC\\Preview\\MSOfficeDoc' => __DIR__ . '/../../..' . '/lib/private/Preview/MSOfficeDoc.php',
         'OC\\Preview\\MarkDown' => __DIR__ . '/../../..' . '/lib/private/Preview/MarkDown.php',
+        'OC\\Preview\\MimeIconProvider' => __DIR__ . '/../../..' . '/lib/private/Preview/MimeIconProvider.php',
         'OC\\Preview\\Movie' => __DIR__ . '/../../..' . '/lib/private/Preview/Movie.php',
         'OC\\Preview\\Office' => __DIR__ . '/../../..' . '/lib/private/Preview/Office.php',
         'OC\\Preview\\OpenDocument' => __DIR__ . '/../../..' . '/lib/private/Preview/OpenDocument.php',
diff --git a/lib/private/Preview/MimeIconProvider.php b/lib/private/Preview/MimeIconProvider.php
new file mode 100644
index 00000000000..1e44e8ca80a
--- /dev/null
+++ b/lib/private/Preview/MimeIconProvider.php
@@ -0,0 +1,98 @@
+<?php
+/**
+ * @copyright Copyright (c) 2023 John Molakvoæ <skjnldsv@protonmail.com>
+ *
+ * @author John Molakvoæ <skjnldsv@protonmail.com>
+ *
+ * @license AGPL-3.0-or-later
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * 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, version 3,
+ * along with this program. If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+namespace OC\Preview;
+
+use OCA\Theming\ThemingDefaults;
+use OCP\App\IAppManager;
+use OCP\Files\IMimeTypeDetector;
+use OCP\IConfig;
+use OCP\IURLGenerator;
+use OCP\Preview\IMimeIconProvider;
+
+class MimeIconProvider implements IMimeIconProvider {
+	public function __construct(
+		protected IMimeTypeDetector $mimetypeDetector,
+		protected IConfig $config,
+		protected IURLGenerator $urlGenerator,
+		protected IAppManager $appManager,
+		protected ThemingDefaults $themingDefaults,
+	) {
+	}
+
+	public function getMimeIconUrl(string $mime): null|string {
+		if (!$mime) {
+			return null;
+		}
+
+		// Fetch all the aliases
+		$aliases = $this->mimetypeDetector->getAllAliases();
+
+		// Remove comments
+		$aliases = array_filter($aliases, static function ($key) {
+			return !($key === '' || $key[0] === '_');
+		}, ARRAY_FILTER_USE_KEY);
+
+		// Map all the aliases recursively
+		foreach ($aliases as $alias => $value) {
+			if ($alias === $mime) {
+				$mime = $value;
+			}
+		}
+
+		$fileName = str_replace('/', '-', $mime);
+		if ($url = $this->searchfileName($fileName)) {
+			return $url;
+		}
+
+		$mimeType = explode('/', $mime)[0];
+		if ($url = $this->searchfileName($mimeType)) {
+			return $url;
+		}
+
+		return null;
+	}
+	
+	private function searchfileName(string $fileName): null|string {
+		// If the file exists in the current enabled legacy
+		// custom theme, let's return it
+		$theme = $this->config->getSystemValue('theme', '');
+		if (!empty($theme)) {
+			$path = "/themes/$theme/core/img/filetypes/$fileName.svg";
+			if (file_exists(\OC::$SERVERROOT . $path)) {
+				return $this->urlGenerator->getAbsoluteURL($path);
+			}
+		}
+		
+		// Previously, we used to pass thi through Theming
+		// But it was only used to colour icons containing
+		// 0082c9. Since with vue we moved to inline svg icons,
+		// we can just use the default core icons.
+
+		// Finally, if the file exists in core, let's return it
+		$path = "/core/img/filetypes/$fileName.svg";
+		if (file_exists(\OC::$SERVERROOT . $path)) {
+			return $this->urlGenerator->getAbsoluteURL($path);
+		}
+
+		return null;
+	}
+}
diff --git a/lib/private/Server.php b/lib/private/Server.php
index e9966e83cae..e1de1b84e29 100644
--- a/lib/private/Server.php
+++ b/lib/private/Server.php
@@ -127,6 +127,7 @@ use OC\Notification\Manager;
 use OC\OCS\DiscoveryService;
 use OC\Preview\GeneratorHelper;
 use OC\Preview\IMagickSupport;
+use OC\Preview\MimeIconProvider;
 use OC\Remote\Api\ApiFactory;
 use OC\Remote\InstanceFactory;
 use OC\RichObjectStrings\Validator;
@@ -262,6 +263,7 @@ use OCA\Files_External\Service\GlobalStoragesService;
 use OCA\Files_External\Service\BackendService;
 use OCP\Profiler\IProfiler;
 use OC\Profiler\Profiler;
+use OCP\Preview\IMimeIconProvider;
 
 /**
  * Class Server
@@ -337,6 +339,7 @@ class Server extends ServerContainer implements IServerContainer {
 		});
 		/** @deprecated 19.0.0 */
 		$this->registerDeprecatedAlias('PreviewManager', IPreview::class);
+		$this->registerAlias(IMimeIconProvider::class, MimeIconProvider::class);
 
 		$this->registerService(\OC\Preview\Watcher::class, function (ContainerInterface $c) {
 			return new \OC\Preview\Watcher(
diff --git a/lib/public/Files/IMimeTypeDetector.php b/lib/public/Files/IMimeTypeDetector.php
index 11ba5cfc95f..9992c153edc 100644
--- a/lib/public/Files/IMimeTypeDetector.php
+++ b/lib/public/Files/IMimeTypeDetector.php
@@ -82,4 +82,10 @@ interface IMimeTypeDetector {
 	 * @since 8.2.0
 	 */
 	public function mimeTypeIcon($mimeType);
+
+	/**
+	 * @return string[]
+	 * @since 28.0.0
+	 */
+	public function getAllAliases(): array;
 }
diff --git a/lib/public/Preview/IMimeIconProvider.php b/lib/public/Preview/IMimeIconProvider.php
new file mode 100644
index 00000000000..cb397ddfda7
--- /dev/null
+++ b/lib/public/Preview/IMimeIconProvider.php
@@ -0,0 +1,37 @@
+<?php
+/**
+ * @copyright Copyright (c) 2023 John Molakvoæ <skjnldsv@protonmail.com>
+ *
+ * @author John Molakvoæ <skjnldsv@protonmail.com>
+ *
+ * @license AGPL-3.0-or-later
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * 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, version 3,
+ * along with this program. If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+namespace OCP\Preview;
+
+/**
+ * Interface IMimeIconProvider
+ *
+ * @since 28.0.0
+ */
+interface IMimeIconProvider {
+	/**
+	 * Get the URL to the icon for the given mime type
+	 * Used by the preview provider to show a mime icon
+	 * if no preview is available.
+	 * @since 28.0.0
+	 */
+	public function getMimeIconUrl(string $mime): string|null;
+}