feat: register conversion provider

Signed-off-by: Elizabeth Danzberger <lizzy7128@tutanota.de>

Author: elzody

lib/AppInfo/Application.php

@@ -10,6 +10,7 @@
 
 use OCA\Files_Sharing\Event\ShareLinkAccessedEvent;
 use OCA\Richdocuments\Capabilities;
+use OCA\Richdocuments\Conversion\ConversionProvider;
 use OCA\Richdocuments\Db\WopiMapper;
 use OCA\Richdocuments\Listener\AddContentSecurityPolicyListener;
 use OCA\Richdocuments\Listener\AddFeaturePolicyListener;
@@ -81,6 +82,7 @@ public function register(IRegistrationContext $context): void {
 		$context->registerPreviewProvider(OOXML::class, OOXML::MIMETYPE_REGEX);
 		$context->registerPreviewProvider(OpenDocument::class, OpenDocument::MIMETYPE_REGEX);
 		$context->registerPreviewProvider(Pdf::class, Pdf::MIMETYPE_REGEX);
+		$context->registerFileConversionProvider(ConversionProvider::class);
 		$context->registerNotifierService(Notifier::class);
 	}
 

lib/Conversion/ConversionProvider.php

@@ -0,0 +1,57 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\Richdocuments\Conversion;
+
+use OCA\Richdocuments\Service\RemoteService;
+use OCP\Files\Conversion\ConversionMimeProvider;
+use OCP\Files\Conversion\IConversionProvider;
+use OCP\Files\File;
+use OCP\IL10N;
+
+class ConversionProvider implements IConversionProvider {
+	public function __construct(
+		private RemoteService $remoteService,
+		private IL10N $l10n,
+	) {
+	}
+
+	public function getSupportedMimeTypes(): array {
+		return [
+			new ConversionMimeProvider(
+				'application/vnd.oasis.opendocument.text',
+				'application/pdf',
+				'pdf',
+				$this->l10n->t('Portable Document Format (.pdf)'),
+			),
+		];
+	}
+
+	public function convertFile(File $file, string $targetMimeType): mixed {
+		$targetFileExtension = $this->getExtensionForMimeType($targetMimeType);
+		if ($targetFileExtension === null) {
+			throw new \Exception($this->l10n->t(
+				'Unable to determine the proper file extension for %1$s',
+				[$targetMimeType]
+			));
+		}
+		
+		return $this->remoteService->convertFileTo($file, $targetFileExtension);
+	}
+
+	private function getExtensionForMimeType(string $mimeType): ?string {
+		foreach ($this->getSupportedMimeTypes() as $mimeProvider) {
+			if ($mimeProvider->getTo() === $mimeType) {
+				return $mimeProvider->getExtension();
+			}
+		}
+
+		return null;
+	}
+}