allow admin to configure the max trashbin size

this allows an admin to configure the max trashbin size instead of always relying on the users quota.

The trashbin size can be configured using the `occ trash:size` command and can be set both globally and per-user

Signed-off-by: Robin Appelman <robin@icewind.nl>

apps/files_trashbin/appinfo/info.xml

@@ -34,6 +34,7 @@ To prevent a user from running out of disk space, the Deleted files app will not
 	<commands>
 		<command>OCA\Files_Trashbin\Command\CleanUp</command>
 		<command>OCA\Files_Trashbin\Command\ExpireTrash</command>
+		<command>OCA\Files_Trashbin\Command\Size</command>
 	</commands>
 
 	<sabre>

apps/files_trashbin/composer/composer/autoload_classmap.php

@@ -12,6 +12,7 @@ return array(
     'OCA\\Files_Trashbin\\Command\\CleanUp' => $baseDir . '/../lib/Command/CleanUp.php',
     'OCA\\Files_Trashbin\\Command\\Expire' => $baseDir . '/../lib/Command/Expire.php',
     'OCA\\Files_Trashbin\\Command\\ExpireTrash' => $baseDir . '/../lib/Command/ExpireTrash.php',
+    'OCA\\Files_Trashbin\\Command\\Size' => $baseDir . '/../lib/Command/Size.php',
     'OCA\\Files_Trashbin\\Controller\\PreviewController' => $baseDir . '/../lib/Controller/PreviewController.php',
     'OCA\\Files_Trashbin\\Events\\MoveToTrashEvent' => $baseDir . '/../lib/Events/MoveToTrashEvent.php',
     'OCA\\Files_Trashbin\\Exceptions\\CopyRecursiveException' => $baseDir . '/../lib/Exceptions/CopyRecursiveException.php',

apps/files_trashbin/composer/composer/autoload_static.php

@@ -27,6 +27,7 @@ class ComposerStaticInitFiles_Trashbin
         'OCA\\Files_Trashbin\\Command\\CleanUp' => __DIR__ . '/..' . '/../lib/Command/CleanUp.php',
         'OCA\\Files_Trashbin\\Command\\Expire' => __DIR__ . '/..' . '/../lib/Command/Expire.php',
         'OCA\\Files_Trashbin\\Command\\ExpireTrash' => __DIR__ . '/..' . '/../lib/Command/ExpireTrash.php',
+        'OCA\\Files_Trashbin\\Command\\Size' => __DIR__ . '/..' . '/../lib/Command/Size.php',
         'OCA\\Files_Trashbin\\Controller\\PreviewController' => __DIR__ . '/..' . '/../lib/Controller/PreviewController.php',
         'OCA\\Files_Trashbin\\Events\\MoveToTrashEvent' => __DIR__ . '/..' . '/../lib/Events/MoveToTrashEvent.php',
         'OCA\\Files_Trashbin\\Exceptions\\CopyRecursiveException' => __DIR__ . '/..' . '/../lib/Exceptions/CopyRecursiveException.php',

apps/files_trashbin/lib/Command/Size.php

@@ -0,0 +1,146 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2020 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_Trashbin\Command;
+
+use OC\Core\Command\Base;
+use OCP\Command\IBus;
+use OCP\IConfig;
+use OCP\IUser;
+use OCP\IUserManager;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\OutputInterface;
+
+class Size extends Base {
+	private $config;
+	private $userManager;
+	private $commandBus;
+
+	public function __construct(
+		IConfig $config,
+		IUserManager $userManager,
+		IBus $commandBus
+	) {
+		parent::__construct();
+
+		$this->config = $config;
+		$this->userManager = $userManager;
+		$this->commandBus = $commandBus;
+	}
+
+	protected function configure() {
+		parent::configure();
+		$this
+			->setName('trashbin:size')
+			->setDescription('Configure the target trashbin size')
+			->addOption('user', 'u', InputOption::VALUE_REQUIRED, 'configure the target size for the provided user, if no user is given the default size is configured')
+			->addArgument(
+				'size',
+				InputArgument::OPTIONAL,
+				'the target size for the trashbin, if not provided the current trashbin size will be returned'
+			);
+	}
+
+	protected function execute(InputInterface $input, OutputInterface $output): int {
+		$user = $input->getOption('user');
+		$size = $input->getArgument('size');
+
+		if ($size) {
+			$parsedSize = \OC_Helper::computerFileSize($size);
+			if ($parsedSize === false) {
+				$output->writeln("<error>Failed to parse input size</error>");
+				return -1;
+			}
+			if ($user) {
+				$this->config->setUserValue($user, 'files_trashbin', 'trashbin_size', (string)$parsedSize);
+				$this->commandBus->push(new Expire($user));
+			} else {
+				$this->config->setAppValue('files_trashbin', 'trashbin_size', (string)$parsedSize);
+				$output->writeln("<info>Warning: changing the default trashbin size will automatically trigger cleanup of existing trashbins,</info>");
+				$output->writeln("<info>a users trashbin can exceed the configured size until they move a new file to the trashbin.</info>");
+			}
+		} else {
+			$this->printTrashbinSize($input, $output, $user);
+		}
+
+		return 0;
+	}
+
+	private function printTrashbinSize(InputInterface $input, OutputInterface $output, ?string $user) {
+		$globalSize = (int)$this->config->getAppValue('files_trashbin', 'trashbin_size', '-1');
+		if ($globalSize < 0) {
+			$globalHumanSize = "default (50% of available space)";
+		} else {
+			$globalHumanSize = \OC_Helper::humanFileSize($globalSize);
+		}
+
+		if ($user) {
+			$userSize = (int)$this->config->getUserValue($user, 'files_trashbin', 'trashbin_size', '-1');
+
+			if ($userSize < 0) {
+				$userHumanSize = ($globalSize < 0) ? $globalHumanSize : "default($globalHumanSize)";
+			} else {
+				$userHumanSize = \OC_Helper::humanFileSize($userSize);
+			}
+
+			if ($input->getOption('output') == self::OUTPUT_FORMAT_PLAIN) {
+				$output->writeln($userHumanSize);
+			} else {
+				$userValue = ($userSize < 0) ? 'default' : $userSize;
+				$globalValue = ($globalSize < 0) ? 'default' : $globalSize;
+				$this->writeArrayInOutputFormat($input, $output, [
+					'user_size' => $userValue,
+					'global_size' => $globalValue,
+					'effective_size' => ($userSize < 0) ? $globalValue : $userValue,
+				]);
+			}
+		} else {
+			$users = [];
+			$this->userManager->callForSeenUsers(function (IUser $user) use (&$users) {
+				$users[] = $user->getUID();
+			});
+			$userValues = $this->config->getUserValueForUsers('files_trashbin', 'trashbin_size', $users);
+
+			if ($input->getOption('output') == self::OUTPUT_FORMAT_PLAIN) {
+				$output->writeln("Default size: $globalHumanSize");
+				$output->writeln("");
+				if (count($userValues)) {
+					$output->writeln("Per-user sizes:");
+					$this->writeArrayInOutputFormat($input, $output, array_map(function ($size) {
+						return \OC_Helper::humanFileSize($size);
+					}, $userValues));
+				} else {
+					$output->writeln("No per-user sizes configured");
+				}
+			} else {
+				$globalValue = ($globalSize < 0) ? 'default' : $globalSize;
+				$this->writeArrayInOutputFormat($input, $output, [
+					'global_size' => $globalValue,
+					'user_sizes' => $userValues,
+				]);
+			}
+		}
+	}
+}

apps/files_trashbin/lib/Trashbin.php

@@ -569,6 +569,7 @@ class Trashbin {
 
 	/**
 	 * wrapper function to emit the 'preDelete' hook of \OCP\Trashbin before a file is deleted
+	 *
 	 * @param string $path
 	 */
 	protected static function emitTrashbinPreDelete($path) {
@@ -577,6 +578,7 @@ class Trashbin {
 
 	/**
 	 * wrapper function to emit the 'delete' hook of \OCP\Trashbin after a file has been deleted
+	 *
 	 * @param string $path
 	 */
 	protected static function emitTrashbinPostDelete($path) {
@@ -693,6 +695,14 @@ class Trashbin {
 	 * @return int available free space for trash bin
 	 */
 	private static function calculateFreeSpace($trashbinSize, $user) {
+		$config = \OC::$server->getConfig();
+		$systemTrashbinSize = (int)$config->getAppValue('files_trashbin', 'trashbin_size', '-1');
+		$userTrashbinSize = (int)$config->getUserValue($user, 'files_trashbin', 'trashbin_size', '-1');
+		$configuredTrashbinSize = ($userTrashbinSize < 0) ? $systemTrashbinSize : $userTrashbinSize;
+		if ($configuredTrashbinSize) {
+			return $configuredTrashbinSize - $trashbinSize;
+		}
+
 		$softQuota = true;
 		$userObject = \OC::$server->getUserManager()->get($user);
 		if (is_null($userObject)) {

lib/private/Server.php

@@ -143,6 +143,7 @@ use OCP\AppFramework\QueryException;
 use OCP\Authentication\LoginCredentials\IStore;
 use OCP\BackgroundJob\IJobList;
 use OCP\Collaboration\AutoComplete\IManager;
+use OCP\Command\IBus;
 use OCP\Comments\ICommentsManager;
 use OCP\Contacts\ContactsMenu\IActionFactory;
 use OCP\Contacts\ContactsMenu\IContactsStore;
@@ -906,7 +907,7 @@ class Server extends ServerContainer implements IServerContainer {
 		$this->registerService('AsyncCommandBus', function (Server $c) {
 			$busClass = $c->getConfig()->getSystemValue('commandbus');
 			if ($busClass) {
-				list($app, $class) = explode('::', $busClass, 2);
+				[$app, $class] = explode('::', $busClass, 2);
 				if ($c->getAppManager()->isInstalled($app)) {
 					\OC_App::loadApp($app);
 					return $c->query($class);
@@ -918,6 +919,7 @@ class Server extends ServerContainer implements IServerContainer {
 				return new CronBus($jobList);
 			}
 		});
+		$this->registerAlias(IBus::class, 'AsyncCommandBus');
 		$this->registerService('TrustedDomainHelper', function ($c) {
 			return new TrustedDomainHelper($this->getConfig());
 		});