enh: Add conversion service to allow other apps to use the document conversion api

Signed-off-by: Julius Härtl <jus@bitgrid.net>

lib/Service/ConvertService.php

@@ -0,0 +1,93 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @copyright Copyright (c) 2022 Julius Härtl <jus@bitgrid.net>
+ *
+ * @author Julius Härtl <jus@bitgrid.net>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * 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
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+namespace OCA\Richdocuments\Service;
+
+use OCA\Richdocuments\Capabilities;
+use OCP\Files\File;
+use OCP\Http\Client\IClientService;
+use OCP\IConfig;
+use Psr\Log\LoggerInterface;
+
+/**
+ * @api
+ * @since 26.0.0
+ */
+class ConvertService {
+	private IClientService $clientService;
+	private IConfig $config;
+	private LoggerInterface $logger;
+	private array $capabilitites;
+
+	/**
+	 * @internal
+	 */
+	public function __construct(IClientService $clientService, IConfig $config, Capabilities $capabilities, LoggerInterface $logger) {
+		$this->clientService = $clientService;
+		$this->config = $config;
+		$this->capabilitites = $capabilities->getCapabilities()['richdocuments'] ?? [];
+		$this->logger = $logger;
+	}
+
+	private function getWopiURL() {
+		return $this->config->getAppValue('richdocuments', 'wopi_url');
+	}
+
+	public function isAvailable() {
+		if (isset($this->capabilitites['collabora']['convert-to']['available'])) {
+			return (bool)$this->capabilitites['collabora']['convert-to']['available'];
+		}
+		return false;
+	}
+
+	public function convertFile(File $file, string $format = 'png') {
+		$useTempFile = $file->isEncrypted() || !$file->getStorage()->isLocal();
+		if ($useTempFile) {
+			$fileName = $file->getStorage()->getLocalFile($file->getInternalPath());
+			$stream = fopen($fileName, 'r');
+		} else {
+			$stream = $file->fopen('r');
+		}
+		$client = $this->clientService->newClient();
+		$options = [
+			'timeout' => 25,
+			'verify' => $this->config->getAppValue('richdocuments', 'disable_certificate_verification') === 'yes',
+			'multipart' => [
+				['name' => $file->getName(), 'contents' => $stream]
+			]
+		];
+
+		try {
+			$response = $client->post($this->getWopiURL(). '/lool/convert-to/' . $format, $options);
+		} catch (\Exception $e) {
+			$this->logger->info($e, [
+				'message' => 'Failed to convert file to ' . $format,
+			]);
+			return false;
+		}
+		return $response->getBody();
+	}
+}