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<?php
/**
* @copyright Copyright (c) 2016, ownCloud, Inc.
*
* @author Morris Jobke <hey@morrisjobke.de>
* @author Roeland Jago Douma <roeland@famdouma.nl>
* @author Victor Dubiniuk <dubiniuk@owncloud.com>
*
* @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_Versions;
use OCP\AppFramework\Utility\ITimeFactory;
use OCP\IConfig;
class Expiration {
// how long do we keep files a version if no other value is defined in the config file (unit: days)
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 = $config->getSystemValue('versions_retention_obligation', 'auto');
if ($this->retentionObligation !== 'disabled') {
$this->parseRetentionObligation();
}
}
/**
* Is versions expiration enabled
* @return bool
*/
public function isEnabled() {
return $this->retentionObligation !== 'disabled';
}
/**
* Is default expiration active
*/
public function shouldAutoExpire() {
return $this->minAge === self::NO_OBLIGATION
|| $this->maxAge === self::NO_OBLIGATION;
}
/**
* 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;
}
/**
* Get maximal retention obligation as a timestamp
* @return int
*/
public function getMaxAgeAsTimestamp() {
$maxAge = false;
if ($this->isEnabled() && $this->maxAge !== self::NO_OBLIGATION) {
$time = $this->timeFactory->getTime();
$maxAge = $time - ($this->maxAge * 86400);
}
return $maxAge;
}
/**
* Read versions_retention_obligation, validate it
* and set private members accordingly
*/
private function parseRetentionObligation() {
$splitValues = explode(',', $this->retentionObligation);
if (!isset($splitValues[0])) {
$minValue = 'auto';
} else {
$minValue = trim($splitValues[0]);
}
if (!isset($splitValues[1])) {
$maxValue = 'auto';
} else {
$maxValue = trim($splitValues[1]);
}
$isValid = true;
// Validate
if (!ctype_digit($minValue) && $minValue !== 'auto') {
$isValid = false;
\OC::$server->getLogger()->warning(
$minValue . ' is not a valid value for minimal versions retention obligation. Check versions_retention_obligation in your config.php. Falling back to auto.',
['app'=>'files_versions']
);
}
if (!ctype_digit($maxValue) && $maxValue !== 'auto') {
$isValid = false;
\OC::$server->getLogger()->warning(
$maxValue . ' is not a valid value for maximal versions retention obligation. Check versions_retention_obligation in your config.php. Falling back to auto.',
['app'=>'files_versions']
);
}
if (!$isValid){
$minValue = 'auto';
$maxValue = 'auto';
}
if ($minValue === 'auto' && $maxValue === 'auto') {
// Default: Delete anytime if space needed
$this->minAge = self::NO_OBLIGATION;
$this->maxAge = self::NO_OBLIGATION;
$this->canPurgeToSaveSpace = true;
} elseif ($minValue !== 'auto' && $maxValue === 'auto') {
// Keep for X days but delete anytime if space needed
$this->minAge = (int)$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;
$this->maxAge = (int)$maxValue;
$this->canPurgeToSaveSpace = true;
} elseif ($minValue !== 'auto' && $maxValue !== 'auto') {
// Delete all older than max OR older than min if space needed
// Max < Min as per https://github.com/owncloud/core/issues/16301
if ($maxValue < $minValue) {
$maxValue = $minValue;
}
$this->minAge = (int)$minValue;
$this->maxAge = (int)$maxValue;
$this->canPurgeToSaveSpace = false;
}
}
}
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