feat(preview): add command to cleanup preview folder

When changing preview parameters (size, format, …), one can simply delete the preview folder and run
files:scan-app-data in order to retrigger updated preview recreation because files are absent.

However, that's not possible when using ObjectStorage as primary storage, as there's no concept of
"preview folder".

This command allows to simply delete and recreate the preview folder properly from
Nextcloud, so that the abstraction levels handle all the subfolder & file deleting part.

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

core/Command/Preview/Cleanup.php

@@ -0,0 +1,88 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OC\Core\Command\Preview;
+
+use OC\Core\Command\Base;
+use OCP\Files\Folder;
+use OCP\Files\IRootFolder;
+use OCP\Files\NotFoundException;
+use OCP\Files\NotPermittedException;
+use Psr\Log\LoggerInterface;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+class Cleanup extends Base {
+
+	public function __construct(
+		private IRootFolder     $rootFolder,
+		private LoggerInterface $logger,
+	) {
+		parent::__construct();
+	}
+
+	protected function configure(): void {
+		$this
+			->setName('preview:cleanup')
+			->setDescription('Removes existing preview files');
+	}
+
+	protected function execute(InputInterface $input, OutputInterface $output): int {
+		try {
+			$appDataFolder = $this->rootFolder->get($this->rootFolder->getAppDataDirectoryName());
+
+			if (!$appDataFolder instanceof Folder) {
+				$this->logger->error("Previews can't be removed: appdata is not a folder");
+				$output->writeln("Previews can't be removed: appdata is not a folder");
+				return 1;
+			}
+
+			/** @var Folder $previewFolder */
+			$previewFolder = $appDataFolder->get('preview');
+
+		} catch (NotFoundException $e) {
+			$this->logger->error("Previews can't be removed: appdata folder can't be found", ['exception' => $e]);
+			$output->writeln("Previews can't be removed: preview folder isn't deletable");
+			return 1;
+		}
+
+		if (!$previewFolder->isDeletable()) {
+			$this->logger->error("Previews can't be removed: preview folder isn't deletable");
+			$output->writeln("Previews can't be removed: preview folder isn't deletable");
+			return 1;
+		}
+
+		try {
+			$previewFolder->delete();
+			$this->logger->debug('Preview folder deleted');
+			$output->writeln('Preview folder deleted', OutputInterface::VERBOSITY_VERBOSE);
+		} catch (NotFoundException $e) {
+			$output->writeln("Previews weren't deleted: preview folder was not found while deleting it");
+			$this->logger->error("Previews weren't deleted: preview folder was not found while deleting it", ['exception' => $e]);
+			return 1;
+		} catch (NotPermittedException $e) {
+			$output->writeln("Previews weren't deleted: you don't have the permission to delete preview folder");
+			$this->logger->error("Previews weren't deleted: you don't have the permission to delete preview folder", ['exception' => $e]);
+			return 1;
+		}
+
+		try {
+			$appDataFolder->newFolder('preview');
+			$this->logger->debug('Preview folder recreated');
+			$output->writeln('Preview folder recreated', OutputInterface::VERBOSITY_VERBOSE);
+		} catch (NotPermittedException $e) {
+			$output->writeln("Preview folder was deleted, but you don't have the permission to create preview folder");
+			$this->logger->error("Preview folder was deleted, but you don't have the permission to create preview folder", ['exception' => $e]);
+			return 1;
+		}
+
+		$output->writeln('Previews removed');
+		return 0;
+	}
+}

core/register_command.php

@@ -102,6 +102,7 @@ if ($config->getSystemValueBool('installed', false)) {
 	$application->add(Server::get(Command\Maintenance\Repair::class));
 	$application->add(Server::get(Command\Maintenance\RepairShareOwnership::class));
 
+	$application->add(Server::get(Command\Preview\Cleanup::class));
 	$application->add(Server::get(Command\Preview\Generate::class));
 	$application->add(Server::get(Command\Preview\Repair::class));
 	$application->add(Server::get(Command\Preview\ResetRenderedTexts::class));

lib/composer/composer/autoload_classmap.php

@@ -1213,6 +1213,7 @@ return array(
     'OC\\Core\\Command\\Maintenance\\UpdateHtaccess' => $baseDir . '/core/Command/Maintenance/UpdateHtaccess.php',
     'OC\\Core\\Command\\Maintenance\\UpdateTheme' => $baseDir . '/core/Command/Maintenance/UpdateTheme.php',
     'OC\\Core\\Command\\Memcache\\RedisCommand' => $baseDir . '/core/Command/Memcache/RedisCommand.php',
+    'OC\\Core\\Command\\Preview\\Cleanup' => $baseDir . '/core/Command/Preview/Cleanup.php',
     'OC\\Core\\Command\\Preview\\Generate' => $baseDir . '/core/Command/Preview/Generate.php',
     'OC\\Core\\Command\\Preview\\Repair' => $baseDir . '/core/Command/Preview/Repair.php',
     'OC\\Core\\Command\\Preview\\ResetRenderedTexts' => $baseDir . '/core/Command/Preview/ResetRenderedTexts.php',

lib/composer/composer/autoload_static.php

@@ -1246,6 +1246,7 @@ class ComposerStaticInit749170dad3f5e7f9ca158f5a9f04f6a2
         'OC\\Core\\Command\\Maintenance\\UpdateHtaccess' => __DIR__ . '/../../..' . '/core/Command/Maintenance/UpdateHtaccess.php',
         'OC\\Core\\Command\\Maintenance\\UpdateTheme' => __DIR__ . '/../../..' . '/core/Command/Maintenance/UpdateTheme.php',
         'OC\\Core\\Command\\Memcache\\RedisCommand' => __DIR__ . '/../../..' . '/core/Command/Memcache/RedisCommand.php',
+        'OC\\Core\\Command\\Preview\\Cleanup' => __DIR__ . '/../../..' . '/core/Command/Preview/Cleanup.php',
         'OC\\Core\\Command\\Preview\\Generate' => __DIR__ . '/../../..' . '/core/Command/Preview/Generate.php',
         'OC\\Core\\Command\\Preview\\Repair' => __DIR__ . '/../../..' . '/core/Command/Preview/Repair.php',
         'OC\\Core\\Command\\Preview\\ResetRenderedTexts' => __DIR__ . '/../../..' . '/core/Command/Preview/ResetRenderedTexts.php',

tests/Core/Command/Preview/CleanupTest.php

@@ -0,0 +1,176 @@
+<?php
+/**
+ * SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+namespace Core\Command\Preview;
+
+use OC\Core\Command\Preview\Cleanup;
+use OCP\Files\Folder;
+use OCP\Files\IRootFolder;
+use OCP\Files\NotFoundException;
+use OCP\Files\NotPermittedException;
+use PHPUnit\Framework\MockObject\MockObject;
+use Psr\Log\LoggerInterface;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+use Test\TestCase;
+
+class CleanupTest extends TestCase {
+	private IRootFolder&MockObject $rootFolder;
+	private LoggerInterface&MockObject $logger;
+	private InputInterface&MockObject $input;
+	private OutputInterface&MockObject $output;
+	private Cleanup $repair;
+
+	protected function setUp(): void {
+		parent::setUp();
+		$this->rootFolder = $this->createMock(IRootFolder::class);
+		$this->logger = $this->createMock(LoggerInterface::class);
+		$this->repair = new Cleanup(
+			$this->rootFolder,
+			$this->logger,
+		);
+
+		$this->input = $this->createMock(InputInterface::class);
+		$this->output = $this->createMock(OutputInterface::class);
+	}
+
+	public function testCleanup(): void {
+		$previewFolder = $this->createMock(Folder::class);
+		$previewFolder->expects($this->once())
+			->method('isDeletable')
+			->willReturn(true);
+
+		$previewFolder->expects($this->once())
+			->method('delete');
+
+		$appDataFolder = $this->createMock(Folder::class);
+		$appDataFolder->expects($this->once())->method('get')->with('preview')->willReturn($previewFolder);
+		$appDataFolder->expects($this->once())->method('newFolder')->with('preview');
+
+		$this->rootFolder->expects($this->once())
+			->method('getAppDataDirectoryName')
+			->willReturn('appdata_some_id');
+
+		$this->rootFolder->expects($this->once())
+			->method('get')
+			->with('appdata_some_id')
+			->willReturn($appDataFolder);
+
+		$this->output->expects($this->exactly(3))->method('writeln')
+			->with(self::callback(function (string $message): bool {
+				static $i = 0;
+				return match (++$i) {
+					1 => $message === 'Preview folder deleted',
+					2 => $message === 'Preview folder recreated',
+					3 => $message === 'Previews removed'
+				};
+			}));
+
+		$this->assertEquals(0, $this->repair->run($this->input, $this->output));
+	}
+
+	public function testCleanupWhenNotDeletable(): void {
+		$previewFolder = $this->createMock(Folder::class);
+		$previewFolder->expects($this->once())
+			->method('isDeletable')
+			->willReturn(false);
+
+		$previewFolder->expects($this->never())
+			->method('delete');
+
+		$appDataFolder = $this->createMock(Folder::class);
+		$appDataFolder->expects($this->once())->method('get')->with('preview')->willReturn($previewFolder);
+		$appDataFolder->expects($this->never())->method('newFolder')->with('preview');
+
+		$this->rootFolder->expects($this->once())
+			->method('getAppDataDirectoryName')
+			->willReturn('appdata_some_id');
+
+		$this->rootFolder->expects($this->once())
+			->method('get')
+			->with('appdata_some_id')
+			->willReturn($appDataFolder);
+
+		$this->logger->expects($this->once())->method('error')->with("Previews can't be removed: preview folder isn't deletable");
+		$this->output->expects($this->once())->method('writeln')->with("Previews can't be removed: preview folder isn't deletable");
+
+		$this->assertEquals(1, $this->repair->run($this->input, $this->output));
+	}
+
+	/**
+	 * @dataProvider dataForTestCleanupWithDeleteException
+	 */
+	public function testCleanupWithDeleteException(string $exceptionClass, string $errorMessage): void {
+		$previewFolder = $this->createMock(Folder::class);
+		$previewFolder->expects($this->once())
+			->method('isDeletable')
+			->willReturn(true);
+
+		$previewFolder->expects($this->once())
+			->method('delete')
+			->willThrowException(new $exceptionClass());
+
+		$appDataFolder = $this->createMock(Folder::class);
+		$appDataFolder->expects($this->once())->method('get')->with('preview')->willReturn($previewFolder);
+		$appDataFolder->expects($this->never())->method('newFolder')->with('preview');
+
+		$this->rootFolder->expects($this->once())
+			->method('getAppDataDirectoryName')
+			->willReturn('appdata_some_id');
+
+		$this->rootFolder->expects($this->once())
+			->method('get')
+			->with('appdata_some_id')
+			->willReturn($appDataFolder);
+
+		$this->logger->expects($this->once())->method('error')->with($errorMessage);
+		$this->output->expects($this->once())->method('writeln')->with($errorMessage);
+
+		$this->assertEquals(1, $this->repair->run($this->input, $this->output));
+	}
+
+	public static function dataForTestCleanupWithDeleteException(): array {
+		return [
+			[NotFoundException::class, "Previews weren't deleted: preview folder was not found while deleting it"],
+			[NotPermittedException::class, "Previews weren't deleted: you don't have the permission to delete preview folder"],
+		];
+	}
+
+	public function testCleanupWithCreateException(): void {
+		$previewFolder = $this->createMock(Folder::class);
+		$previewFolder->expects($this->once())
+			->method('isDeletable')
+			->willReturn(true);
+
+		$previewFolder->expects($this->once())
+			->method('delete');
+
+		$appDataFolder = $this->createMock(Folder::class);
+		$appDataFolder->expects($this->once())->method('get')->with('preview')->willReturn($previewFolder);
+		$appDataFolder->expects($this->once())->method('newFolder')->with('preview')->willThrowException(new NotPermittedException());
+
+		$this->rootFolder->expects($this->once())
+			->method('getAppDataDirectoryName')
+			->willReturn('appdata_some_id');
+
+		$this->rootFolder->expects($this->once())
+			->method('get')
+			->with('appdata_some_id')
+			->willReturn($appDataFolder);
+
+		$this->output->expects($this->exactly(2))->method('writeln')
+			->with(self::callback(function (string $message): bool {
+				static $i = 0;
+				return match (++$i) {
+					1 => $message === 'Preview folder deleted',
+					2 => $message === "Preview folder was deleted, but you don't have the permission to create preview folder",
+				};
+			}));
+
+		$this->logger->expects($this->once())->method('error')->with("Preview folder was deleted, but you don't have the permission to create preview folder");
+
+		$this->assertEquals(1, $this->repair->run($this->input, $this->output));
+	}
+}