1 files changed, 109 insertions, 0 deletions
diff --git a/apps/files/lib/Controller/ConversionApiController.php b/apps/files/lib/Controller/ConversionApiController.php
new file mode 100644
index 00000000000..40a42d6ca4c
--- /dev/null
+++ b/apps/files/lib/Controller/ConversionApiController.php
@@ -0,0 +1,109 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\Files\Controller;
+
+use OC\Files\Utils\PathHelper;
+use OC\ForbiddenException;
+use OCP\AppFramework\Http;
+use OCP\AppFramework\Http\Attribute\ApiRoute;
+use OCP\AppFramework\Http\Attribute\NoAdminRequired;
+use OCP\AppFramework\Http\Attribute\UserRateLimit;
+use OCP\AppFramework\Http\DataResponse;
+use OCP\AppFramework\OCS\OCSBadRequestException;
+use OCP\AppFramework\OCS\OCSException;
+use OCP\AppFramework\OCS\OCSForbiddenException;
+use OCP\AppFramework\OCS\OCSNotFoundException;
+use OCP\AppFramework\OCSController;
+use OCP\Files\Conversion\IConversionManager;
+use OCP\Files\File;
+use OCP\Files\GenericFileException;
+use OCP\Files\IRootFolder;
+use OCP\IL10N;
+use OCP\IRequest;
+use function OCP\Log\logger;
+
+class ConversionApiController extends OCSController {
+	public function __construct(
+		string $appName,
+		IRequest $request,
+		private IConversionManager $fileConversionManager,
+		private IRootFolder $rootFolder,
+		private IL10N $l10n,
+		private ?string $userId,
+	) {
+		parent::__construct($appName, $request);
+	}
+
+	/**
+	 * Converts a file from one MIME type to another
+	 *
+	 * @param int $fileId ID of the file to be converted
+	 * @param string $targetMimeType The MIME type to which you want to convert the file
+	 * @param string|null $destination The target path of the converted file. Written to a temporary file if left empty
+	 *
+	 * @return DataResponse<Http::STATUS_CREATED, array{path: string, fileId: int}, array{}>
+	 *
+	 * 201: File was converted and written to the destination or temporary file
+	 *
+	 * @throws OCSException The file was unable to be converted
+	 * @throws OCSNotFoundException The file to be converted was not found
+	 */
+	#[NoAdminRequired]
+	#[UserRateLimit(limit: 25, period: 120)]
+	#[ApiRoute(verb: 'POST', url: '/api/v1/convert')]
+	public function convert(int $fileId, string $targetMimeType, ?string $destination = null): DataResponse {
+		$userFolder = $this->rootFolder->getUserFolder($this->userId);
+		$file = $userFolder->getFirstNodeById($fileId);
+
+		// Also throw a 404 if the file is not readable to not leak information
+		if (!($file instanceof File) || $file->isReadable() === false) {
+			throw new OCSNotFoundException($this->l10n->t('The file cannot be found'));
+		}
+
+		if ($destination !== null) {
+			$destination = PathHelper::normalizePath($destination);
+			$parentDir = dirname($destination);
+
+			if (!$userFolder->nodeExists($parentDir)) {
+				throw new OCSNotFoundException($this->l10n->t('The destination path does not exist: %1$s', [$parentDir]));
+			}
+
+			if (!$userFolder->get($parentDir)->isCreatable()) {
+				throw new OCSForbiddenException($this->l10n->t('You do not have permission to create a file at the specified location'));
+			}
+
+			$destination = $userFolder->getFullPath($destination);
+		}
+
+		try {
+			$convertedFile = $this->fileConversionManager->convert($file, $targetMimeType, $destination);
+		} catch (ForbiddenException $e) {
+			throw new OCSForbiddenException($e->getMessage());
+		} catch (GenericFileException $e) {
+			throw new OCSBadRequestException($e->getMessage());
+		} catch (\Exception $e) {
+			logger('files')->error($e->getMessage(), ['exception' => $e]);
+			throw new OCSException($this->l10n->t('The file could not be converted.'));
+		}
+
+		$convertedFileRelativePath = $userFolder->getRelativePath($convertedFile);
+		if ($convertedFileRelativePath === null) {
+			throw new OCSNotFoundException($this->l10n->t('Could not get relative path to converted file'));
+		}
+
+		$file = $userFolder->get($convertedFileRelativePath);
+		$fileId = $file->getId();
+
+		return new DataResponse([
+			'path' => $convertedFileRelativePath,
+			'fileId' => $fileId,
+		], Http::STATUS_CREATED);
+	}
+}