diff --git a/apps/files_trashbin/appinfo/application.php b/apps/files_trashbin/appinfo/application.php
index 8d76d40f639fd29ace5c6a11a6225eea21880ede..08ab7cd5c1da6f0cf88502aaec674635bc52a98e 100644
--- a/apps/files_trashbin/appinfo/application.php
+++ b/apps/files_trashbin/appinfo/application.php
@@ -1,6 +1,7 @@
<?php
/**
* @author Roeland Jago Douma <roeland@famdouma.nl>
+ * @author Victor Dubiniuk <dubiniuk@owncloud.com>
*
* @copyright Copyright (c) 2015, ownCloud, Inc.
* @license AGPL-3.0
@@ -22,16 +23,26 @@
namespace OCA\Files_Trashbin\AppInfo;
use OCP\AppFramework\App;
+use OCA\Files_Trashbin\Expiration;
class Application extends App {
- public function __construct(array $urlParams = array()) {
+ public function __construct (array $urlParams = []) {
parent::__construct('files_trashbin', $urlParams);
$container = $this->getContainer();
-
/*
* Register capabilities
*/
$container->registerCapability('OCA\Files_Trashbin\Capabilities');
+
+ /*
+ * Register expiration
+ */
+ $container->registerService('Expiration', function($c) {
+ return new Expiration(
+ $c->query('ServerContainer')->getConfig(),
+ $c->query('OCP\AppFramework\Utility\ITimeFactory')
+ );
+ });
}
}
diff --git a/apps/files_trashbin/appinfo/update.php b/apps/files_trashbin/appinfo/update.php
index e1a0cf955765eff50173d5d8c26fc687334c0678..b77210ae4c07ac7b68aac09f6b8c999e43d5befa 100644
--- a/apps/files_trashbin/appinfo/update.php
+++ b/apps/files_trashbin/appinfo/update.php
@@ -20,10 +20,29 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
-$installedVersion=OCP\Config::getAppValue('files_trashbin', 'installed_version');
+
+$config = \OC::$server->getConfig();
+$installedVersion = $config->getAppValue('files_trashbin', 'installed_version');
if (version_compare($installedVersion, '0.6', '<')) {
//size of the trash bin could be incorrect, remove it for all users to
//enforce a recalculation during next usage.
\OC_DB::dropTable('files_trashsize');
}
+
+if (version_compare($installedVersion, '0.6.4', '<')) {
+ $isExpirationEnabled = $config->getSystemValue('trashbin_auto_expire', true);
+ $oldObligation = $config->getSystemValue('trashbin_retention_obligation', null);
+
+ $newObligation = 'auto';
+ if ($isExpirationEnabled) {
+ if (!is_null($oldObligation)) {
+ $newObligation = strval($oldObligation) . ', auto';
+ }
+ } else {
+ $newObligation = 'disabled';
+ }
+
+ $config->setSystemValue('trashbin_retention_obligation', $newObligation);
+ $config->deleteSystemValue('trashbin_auto_expire');
+}
diff --git a/apps/files_trashbin/lib/expiration.php b/apps/files_trashbin/lib/expiration.php
new file mode 100644
index 0000000000000000000000000000000000000000..138540febf8eb58c8a9586a1bc36b6937041fd03
--- /dev/null
+++ b/apps/files_trashbin/lib/expiration.php
@@ -0,0 +1,152 @@
+<?php
+/**
+ * @author Victor Dubiniuk <dubiniuk@owncloud.com>
+ *
+ * @copyright Copyright (c) 2015, ownCloud, Inc.
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * 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, version 3,
+ * along with this program. If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+namespace OCA\Files_Trashbin;
+
+use \OCP\IConfig;
+use \OCP\AppFramework\Utility\ITimeFactory;
+
+class Expiration {
+
+ // how long do we keep files in the trash bin if no other value is defined in the config file (unit: days)
+ const DEFAULT_RETENTION_OBLIGATION = 30;
+ const NO_OBLIGATION = -1;
+
+ /** @var ITimeFactory */
+ private $timeFactory;
+
+ /** @var string */
+ private $retentionObligation;
+
+ /** @var int */
+ private $minAge;
+
+ /** @var int */
+ private $maxAge;
+
+ /** @var bool */
+ private $canPurgeToSaveSpace;
+
+ public function __construct(IConfig $config,ITimeFactory $timeFactory){
+ $this->timeFactory = $timeFactory;
+ $this->retentionObligation = $config->getSystemValue('trashbin_retention_obligation', 'auto');
+
+ if ($this->retentionObligation !== 'disabled') {
+ $this->parseRetentionObligation();
+ }
+ }
+
+ /**
+ * Is trashbin expiration enabled
+ * @return bool
+ */
+ public function isEnabled(){
+ return $this->retentionObligation !== 'disabled';
+ }
+
+ /**
+ * Check if given timestamp in expiration range
+ * @param int $timestamp
+ * @param bool $quotaExceeded
+ * @return bool
+ */
+ public function isExpired($timestamp, $quotaExceeded = false){
+ // No expiration if disabled
+ if (!$this->isEnabled()) {
+ return false;
+ }
+
+ // Purge to save space (if allowed)
+ if ($quotaExceeded && $this->canPurgeToSaveSpace) {
+ return true;
+ }
+
+ $time = $this->timeFactory->getTime();
+ // Never expire dates in future e.g. misconfiguration or negative time
+ // adjustment
+ if ($time<$timestamp) {
+ return false;
+ }
+
+ // Purge as too old
+ if ($this->maxAge !== self::NO_OBLIGATION) {
+ $maxTimestamp = $time - ($this->maxAge * 86400);
+ $isOlderThanMax = $timestamp < $maxTimestamp;
+ } else {
+ $isOlderThanMax = false;
+ }
+
+ if ($this->minAge !== self::NO_OBLIGATION) {
+ // older than Min obligation and we are running out of quota?
+ $minTimestamp = $time - ($this->minAge * 86400);
+ $isMinReached = ($timestamp < $minTimestamp) && $quotaExceeded;
+ } else {
+ $isMinReached = false;
+ }
+
+ return $isOlderThanMax || $isMinReached;
+ }
+
+ private function parseRetentionObligation(){
+ $splitValues = explode(',', $this->retentionObligation);
+ if (!isset($splitValues[0])) {
+ $minValue = self::DEFAULT_RETENTION_OBLIGATION;
+ } else {
+ $minValue = trim($splitValues[0]);
+ }
+
+ if (!isset($splitValues[1]) && $minValue === 'auto') {
+ $maxValue = 'auto';
+ } elseif (!isset($splitValues[1])) {
+ $maxValue = self::DEFAULT_RETENTION_OBLIGATION;
+ } else {
+ $maxValue = trim($splitValues[1]);
+ }
+
+ if ($minValue === 'auto' && $maxValue === 'auto') {
+ // Default: Keep for 30 days but delete anytime if space needed
+ $this->minAge = self::DEFAULT_RETENTION_OBLIGATION;
+ $this->maxAge = self::NO_OBLIGATION;
+ $this->canPurgeToSaveSpace = true;
+ } elseif ($minValue !== 'auto' && $maxValue === 'auto') {
+ // Keep for X days but delete anytime if space needed
+ $this->minAge = intval($minValue);
+ $this->maxAge = self::NO_OBLIGATION;
+ $this->canPurgeToSaveSpace = true;
+ } elseif ($minValue === 'auto' && $maxValue !== 'auto') {
+ // Delete anytime if space needed, Delete all older than max automatically
+ $this->minAge = self::NO_OBLIGATION;
+ $this->maxAge = intval($maxValue);
+ $this->canPurgeToSaveSpace = true;
+ } elseif ($minValue !== 'auto' && $maxValue !== 'auto') {
+ // Delete all older than max OR older than min if space needed
+
+ // Max < Min as per https://github.com/owncloud/core/issues/16300
+ if ($maxValue < $minValue) {
+ $maxValue = $minValue;
+ }
+
+ $this->minAge = intval($minValue);
+ $this->maxAge = intval($maxValue);
+ $this->canPurgeToSaveSpace = false;
+ }
+ }
+}
diff --git a/apps/files_trashbin/lib/trashbin.php b/apps/files_trashbin/lib/trashbin.php
index 8b666c56c666d49215456ff479c36830acad01a7..2719eece2a849f49b4574ba23ce6da907fea331d 100644
--- a/apps/files_trashbin/lib/trashbin.php
+++ b/apps/files_trashbin/lib/trashbin.php
@@ -38,12 +38,10 @@ namespace OCA\Files_Trashbin;
use OC\Files\Filesystem;
use OC\Files\View;
+use OCA\Files_Trashbin\AppInfo\Application;
use OCA\Files_Trashbin\Command\Expire;
class Trashbin {
- // how long do we keep files in the trash bin if no other value is defined in the config file (unit: days)
-
- const DEFAULT_RETENTION_OBLIGATION = 30;
// unit: percentage; 50% of available disk space/quota
const DEFAULTMAXSIZE = 50;
@@ -631,14 +629,10 @@ class Trashbin {
$availableSpace = self::calculateFreeSpace($trashBinSize, $user);
$size = 0;
- $retention_obligation = \OC_Config::getValue('trashbin_retention_obligation', self::DEFAULT_RETENTION_OBLIGATION);
-
- $limit = time() - ($retention_obligation * 86400);
-
$dirContent = Helper::getTrashFiles('/', $user, 'mtime');
// delete all files older then $retention_obligation
- list($delSize, $count) = self::deleteExpiredFiles($dirContent, $user, $limit, $retention_obligation);
+ list($delSize, $count) = self::deleteExpiredFiles($dirContent, $user);
$size += $delSize;
$availableSpace += $size;
@@ -652,11 +646,11 @@ class Trashbin {
*/
private static function scheduleExpire($trashBinSize, $user) {
// let the admin disable auto expire
- $autoExpire = \OC_Config::getValue('trashbin_auto_expire', true);
- if ($autoExpire === false) {
- return;
+ $application = new Application();
+ $expiration = $application->getContainer()->query('Expiration');
+ if ($expiration->isEnabled()) {
+ \OC::$server->getCommandBus()->push(new Expire($user, $trashBinSize));
}
- \OC::$server->getCommandBus()->push(new Expire($user, $trashBinSize));
}
/**
@@ -669,11 +663,13 @@ class Trashbin {
* @return int size of deleted files
*/
protected static function deleteFiles($files, $user, $availableSpace) {
+ $application = new Application();
+ $expiration = $application->getContainer()->query('Expiration');
$size = 0;
if ($availableSpace < 0) {
foreach ($files as $file) {
- if ($availableSpace < 0) {
+ if ($availableSpace < 0 && $expiration->isExpired($file['mtime'], true)) {
$tmp = self::delete($file['name'], $user, $file['mtime']);
\OCP\Util::writeLog('files_trashbin', 'remove "' . $file['name'] . '" (' . $tmp . 'B) to meet the limit of trash bin size (50% of available quota)', \OCP\Util::INFO);
$availableSpace += $tmp;
@@ -691,20 +687,19 @@ class Trashbin {
*
* @param array $files list of files sorted by mtime
* @param string $user
- * @param int $limit files older then limit should be deleted
- * @param int $retention_obligation max age of file in days
* @return array size of deleted files and number of deleted files
*/
- protected static function deleteExpiredFiles($files, $user, $limit, $retention_obligation) {
+ protected static function deleteExpiredFiles($files, $user) {
+ $application = new Application();
+ $expiration = $application->getContainer()->query('Expiration');
$size = 0;
$count = 0;
foreach ($files as $file) {
$timestamp = $file['mtime'];
$filename = $file['name'];
- if ($timestamp <= $limit) {
+ if ($expiration->isExpired($timestamp)) {
$count++;
$size += self::delete($filename, $user, $timestamp);
- \OCP\Util::writeLog('files_trashbin', 'remove "' . $filename . '" from trash bin because it is older than ' . $retention_obligation, \OCP\Util::INFO);
} else {
break;
}
diff --git a/apps/files_trashbin/tests/expiration.php b/apps/files_trashbin/tests/expiration.php
new file mode 100644
index 0000000000000000000000000000000000000000..7bd51dccddd56ae5dbafbeb4036d9deab9b21575
--- /dev/null
+++ b/apps/files_trashbin/tests/expiration.php
@@ -0,0 +1,200 @@
+<?php
+/**
+ * @author Victor Dubiniuk <dubiniuk@owncloud.com>
+ *
+ * @copyright Copyright (c) 2015, ownCloud, Inc.
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * 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, version 3,
+ * along with this program. If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+use \OCA\Files_Trashbin\Expiration;
+
+class Expiration_Test extends \PHPUnit_Framework_TestCase {
+ const SECONDS_PER_DAY = 86400; //60*60*24
+
+ public function expirationData(){
+ $today = 100*self::SECONDS_PER_DAY;
+ $back10Days = (100-10)*self::SECONDS_PER_DAY;
+ $back20Days = (100-20)*self::SECONDS_PER_DAY;
+ $back30Days = (100-30)*self::SECONDS_PER_DAY;
+ $back35Days = (100-35)*self::SECONDS_PER_DAY;
+
+ // it should never happen, but who knows :/
+ $ahead100Days = (100+100)*self::SECONDS_PER_DAY;
+
+ return [
+ // Expiration is disabled - always should return false
+ [ 'disabled', $today, $back10Days, false, false],
+ [ 'disabled', $today, $back10Days, true, false],
+ [ 'disabled', $today, $ahead100Days, true, false],
+
+ // Default: expire in 30 days or earlier when quota requirements are met
+ [ 'auto', $today, $back10Days, false, false],
+ [ 'auto', $today, $back35Days, false, false],
+ [ 'auto', $today, $back10Days, true, true],
+ [ 'auto', $today, $back35Days, true, true],
+ [ 'auto', $today, $ahead100Days, true, true],
+
+ // The same with 'auto'
+ [ 'auto, auto', $today, $back10Days, false, false],
+ [ 'auto, auto', $today, $back35Days, false, false],
+ [ 'auto, auto', $today, $back10Days, true, true],
+ [ 'auto, auto', $today, $back35Days, true, true],
+
+ // Keep for 15 days but expire anytime if space needed
+ [ '15, auto', $today, $back10Days, false, false],
+ [ '15, auto', $today, $back20Days, false, false],
+ [ '15, auto', $today, $back10Days, true, true],
+ [ '15, auto', $today, $back20Days, true, true],
+ [ '15, auto', $today, $ahead100Days, true, true],
+
+ // Expire anytime if space needed, Expire all older than max
+ [ 'auto, 15', $today, $back10Days, false, false],
+ [ 'auto, 15', $today, $back20Days, false, true],
+ [ 'auto, 15', $today, $back10Days, true, true],
+ [ 'auto, 15', $today, $back20Days, true, true],
+ [ 'auto, 15', $today, $ahead100Days, true, true],
+
+ // Expire all older than max OR older than min if space needed
+ [ '15, 25', $today, $back10Days, false, false],
+ [ '15, 25', $today, $back20Days, false, false],
+ [ '15, 25', $today, $back30Days, false, true],
+ [ '15, 25', $today, $back10Days, false, false],
+ [ '15, 25', $today, $back20Days, true, true],
+ [ '15, 25', $today, $back30Days, true, true],
+ [ '15, 25', $today, $ahead100Days, true, false],
+
+ // Expire all older than max OR older than min if space needed
+ // Max<Min case
+ [ '25, 15', $today, $back10Days, false, false],
+ [ '25, 15', $today, $back20Days, false, false],
+ [ '25, 15', $today, $back30Days, false, true],
+ [ '25, 15', $today, $back10Days, false, false],
+ [ '25, 15', $today, $back20Days, true, false],
+ [ '25, 15', $today, $back30Days, true, true],
+ [ '25, 15', $today, $ahead100Days, true, false],
+ ];
+ }
+
+ /**
+ * @dataProvider expirationData
+ *
+ * @param string $retentionObligation
+ * @param int $timeNow
+ * @param int $timestamp
+ * @param bool $quotaExceeded
+ * @param string $expectedResult
+ */
+ public function testExpiration($retentionObligation, $timeNow, $timestamp, $quotaExceeded, $expectedResult){
+ $mockedConfig = $this->getMockedConfig($retentionObligation);
+ $mockedTimeFactory = $this->getMockedTimeFactory($timeNow);
+
+ $expiration = new Expiration($mockedConfig, $mockedTimeFactory);
+ $actualResult = $expiration->isExpired($timestamp, $quotaExceeded);
+
+ $this->assertEquals($expectedResult, $actualResult);
+ }
+
+
+ public function configData(){
+ return [
+ [ 'disabled', null, null, null],
+ [ 'auto', Expiration::DEFAULT_RETENTION_OBLIGATION, Expiration::NO_OBLIGATION, true ],
+ [ 'auto,auto', Expiration::DEFAULT_RETENTION_OBLIGATION, Expiration::NO_OBLIGATION, true ],
+ [ 'auto, auto', Expiration::DEFAULT_RETENTION_OBLIGATION, Expiration::NO_OBLIGATION, true ],
+ [ 'auto, 3', Expiration::NO_OBLIGATION, 3, true ],
+ [ '5, auto', 5, Expiration::NO_OBLIGATION, true ],
+ [ '3, 5', 3, 5, false ],
+ [ '10, 3', 10, 10, false ],
+ ];
+ }
+
+
+ /**
+ * @dataProvider configData
+ *
+ * @param string $configValue
+ * @param int $expectedMinAge
+ * @param int $expectedMaxAge
+ * @param bool $expectedCanPurgeToSaveSpace
+ */
+ public function testParseRetentionObligation($configValue, $expectedMinAge, $expectedMaxAge, $expectedCanPurgeToSaveSpace){
+ $mockedConfig = $this->getMockedConfig($configValue);
+ $mockedTimeFactory = $this->getMockedTimeFactory(
+ time()
+ );
+
+ $expiration = new Expiration($mockedConfig, $mockedTimeFactory);
+ $this->assertAttributeEquals($expectedMinAge, 'minAge', $expiration);
+ $this->assertAttributeEquals($expectedMaxAge, 'maxAge', $expiration);
+ $this->assertAttributeEquals($expectedCanPurgeToSaveSpace, 'canPurgeToSaveSpace', $expiration);
+ }
+
+ /**
+ *
+ * @param int $time
+ * @return \OCP\AppFramework\Utility\ITimeFactory
+ */
+ private function getMockedTimeFactory($time){
+ $mockedTimeFactory = $this->getMockBuilder('\OCP\AppFramework\Utility\ITimeFactory')
+ ->disableOriginalConstructor()
+ ->setMethods(['getTime'])
+ ->getMock()
+ ;
+ $mockedTimeFactory->expects($this->any())->method('getTime')->will(
+ $this->returnValue($time)
+ );
+
+ return $mockedTimeFactory;
+ }
+
+ /**
+ *
+ * @param string $returnValue
+ * @return \OCP\IConfig
+ */
+ private function getMockedConfig($returnValue){
+ $mockedConfig = $this->getMockBuilder('\OCP\IConfig')
+ ->disableOriginalConstructor()
+ ->setMethods(
+ [
+ 'setSystemValues',
+ 'setSystemValue',
+ 'getSystemValue',
+ 'deleteSystemValue',
+ 'getAppKeys',
+ 'setAppValue',
+ 'getAppValue',
+ 'deleteAppValue',
+ 'deleteAppValues',
+ 'setUserValue',
+ 'getUserValue',
+ 'getUserValueForUsers',
+ 'getUserKeys',
+ 'deleteUserValue',
+ 'deleteAllUserValues',
+ 'deleteAppFromAllUsers',
+ 'getUsersForUserValue'
+ ]
+ )
+ ->getMock()
+ ;
+ $mockedConfig->expects($this->any())->method('getSystemValue')->will(
+ $this->returnValue($returnValue)
+ );
+
+ return $mockedConfig;
+ }
+}
diff --git a/apps/files_trashbin/tests/trashbin.php b/apps/files_trashbin/tests/trashbin.php
index 299c45b19a769e0d10b64b43cf27f7ed0200777e..f60367a77e2e6a79676099f51f72e600f9be7e46 100644
--- a/apps/files_trashbin/tests/trashbin.php
+++ b/apps/files_trashbin/tests/trashbin.php
@@ -38,7 +38,6 @@ class Test_Trashbin extends \Test\TestCase {
private $trashRoot2;
private static $rememberRetentionObligation;
- private static $rememberAutoExpire;
/**
* @var bool
@@ -71,11 +70,8 @@ class Test_Trashbin extends \Test\TestCase {
\OC_App::disable('encryption');
//configure trashbin
- self::$rememberRetentionObligation = \OC_Config::getValue('trashbin_retention_obligation', Files_Trashbin\Trashbin::DEFAULT_RETENTION_OBLIGATION);
- \OC_Config::setValue('trashbin_retention_obligation', 2);
- self::$rememberAutoExpire = \OC_Config::getValue('trashbin_auto_expire', true);
- \OC_Config::setValue('trashbin_auto_expire', true);
-
+ self::$rememberRetentionObligation = \OC_Config::getValue('trashbin_retention_obligation', Files_Trashbin\Expiration::DEFAULT_RETENTION_OBLIGATION);
+ \OC_Config::setValue('trashbin_retention_obligation', 'auto, 2');
// register hooks
Files_Trashbin\Trashbin::registerHooks();
@@ -92,7 +88,6 @@ class Test_Trashbin extends \Test\TestCase {
\OC_User::deleteUser(self::TEST_TRASHBIN_USER1);
\OC_Config::setValue('trashbin_retention_obligation', self::$rememberRetentionObligation);
- \OC_Config::setValue('trashbin_auto_expire', self::$rememberAutoExpire);
\OC_Hook::clear();
@@ -636,12 +631,6 @@ class Test_Trashbin extends \Test\TestCase {
}
}
- $storage = new \ReflectionClass('\OC\Files\Storage\Shared');
- $isInitialized = $storage->getProperty('isInitialized');
- $isInitialized->setAccessible(true);
- $isInitialized->setValue(array());
- $isInitialized->setAccessible(false);
-
\OC_Util::tearDownFS();
\OC_User::setUserId('');
\OC\Files\Filesystem::tearDown();
diff --git a/config/config.sample.php b/config/config.sample.php
index 5c362e9425058b1dbf411830aa9f756a2ada8d6c..047e7ccdd12037aeaa81755275cfe357a989c92a 100644
--- a/config/config.sample.php
+++ b/config/config.sample.php
@@ -399,16 +399,34 @@ $CONFIG = array(
*/
/**
- * When the trash bin app is enabled (default), this is the number of days a
- * file will be kept in the trash bin. Default is 30 days.
- */
-'trashbin_retention_obligation' => 30,
-
-/**
- * Disable or enable auto-expiration for the trash bin. By default
- * auto-expiration is enabled.
- */
-'trashbin_auto_expire' => true,
+ * If the trash bin app is enabled (default), this setting defines the policy
+ * for when files and folders in the trash bin will be permanently deleted.
+ * The app allows for two settings, a minimum time for trash bin retention,
+ * and a maximum time for trash bin retention.
+ * Minimum time is the number of days a file will be kept, after which it
+ * may be deleted. Maximum time is the number of days at which it is guaranteed
+ * to be deleted.
+ * Both minimum and maximum times can be set together to explicitly define
+ * file and folder deletion. For migration purposes, this setting is installed
+ * initially set to "auto", which is equivalent to the default setting in
+ * ownCloud 8.1 and before.
+ *
+ * Available values:
+ * ``auto`` default setting. keeps files and folders in the trash bin
+ * for 30 days and automatically deletes anytime after that
+ * if space is needed (note: files may not be deleted if space
+ * is not needed).
+ * ``D, auto`` keeps files and folders in the trash bin for D+ days,
+ * delete anytime if space needed (note: files may not be deleted
+ * if space is not needed)
+ * * ``auto, D`` delete all files in the trash bin that are older than D days
+ * automatically, delete other files anytime if space needed
+ * * ``D1, D2`` keep files and folders the in trash bin for at least D1 days
+ * and delete when exceeds D2 days
+ * ``disabled`` trash bin auto clean disabled, files and folders will be
+ * kept forever
+ */
+'trashbin_retention_obligation' => 'auto',
/**