feat: redirect to the mime icon if no preview available

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

1 files changed, 98 insertions, 0 deletions

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;
+	}
+}