add command to test scanner

appinfo/info.xml

@@ -65,6 +65,7 @@ For this app to be effective, the ClamAV virus definitions should be kept up to
 		<command>OCA\Files_Antivirus\Command\BackgroundScan</command>
 		<command>OCA\Files_Antivirus\Command\Scan</command>
 		<command>OCA\Files_Antivirus\Command\Mark</command>
+		<command>OCA\Files_Antivirus\Command\Test</command>
 	</commands>
 
 	<settings>

lib/Command/Test.php

@@ -0,0 +1,85 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2023 Robin Appelman <robin@icewind.nl>
+ *
+ * @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\Files_Antivirus\Command;
+
+use OC\Core\Command\Base;
+use OC\Security\Crypto;
+use OCA\Files_Antivirus\Scanner\ScannerFactory;
+use OCA\Files_Antivirus\Status;
+use OCP\Files\File;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+class Test extends Base {
+	private ScannerFactory $scannerFactory;
+	private Crypto $crypto;
+
+	// This is the EICAR test file, encrypted using the password 'eicar' to prevent any AV scanner from picking up this file
+	public const EICAR_ENCRYPTED = 'f413c7d6bb75cb67d474a36f27e776b7b51a68b2a26746465b659c7cd' .
+		'f13d8dea5d5932bc1afe1e34aa28ce75127d6bd6918bbad07503d16257a843fb46ed3dff04b12' .
+		'34d9b112aa556d396dc3afa0c4|cfaa1a828814db5ceb96fd8ab8f2c9e9|0b97b04d59a91ca64' .
+		'73117bcec8672b64a8abf6e6dec8ae70dcc0c05d7639d3dc8329afae8480197fb6f5b366f2c89' .
+		'629a01502a56f72c3bcb7eff3aeb1a6426|3';
+
+	public function __construct(ScannerFactory $scannerFactory, Crypto $crypto) {
+		parent::__construct();
+		$this->scannerFactory = $scannerFactory;
+		$this->crypto = $crypto;
+	}
+
+	protected function configure() {
+		parent::configure();
+
+		$this
+			->setName('files_antivirus:test')
+			->setDescription('Test the availability of the configured scanner');
+	}
+
+	protected function execute(InputInterface $input, OutputInterface $output): int {
+		$output->write("Scanning regular text: ");
+		$scanner = $this->scannerFactory->getScanner();
+		$result = $scanner->scanString("dummy scan content");
+		if ($result->getNumericStatus() !== Status::SCANRESULT_CLEAN) {
+			$details = $result->getDetails();
+			$output->writeln("<error>❌ $details</error>");
+			return 1;
+		} else {
+			$output->writeln("<info>✓</info>");
+		}
+
+		$output->write("Scanning EICAR test file: ");
+		$scanner = $this->scannerFactory->getScanner();
+		$eicar = $this->crypto->decrypt(self::EICAR_ENCRYPTED, 'eicar');
+		$result = $scanner->scanString($eicar);
+		if ($result->getNumericStatus() !== Status::SCANRESULT_INFECTED) {
+			$details = $result->getDetails();
+			$output->writeln("<error>❌ file not detected $details</error>");
+			return 1;
+		} else {
+			$output->writeln("<info>✓</info>");
+		}
+
+		return 0;
+	}
+}