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<?php
/**
* Copyright (c) 2014 Robin Appelman <icewind@owncloud.com>
* This file is licensed under the Affero General Public License version 3 or
* later.
* See the COPYING-README file.
*/
namespace OCA\Files_External;
use OC\Files\Filesystem;
/**
* Updates the etag of parent folders whenever a new external storage mount
* point has been created or deleted. Updates need to be triggered using
* the updateHook() method.
*
* There are two modes of operation:
* - for personal mount points, the etag is propagated directly
* - for system mount points, a dirty flag is saved in the configuration and
* the etag will be updated the next time propagateDirtyMountPoints() is called
*/
class EtagPropagator {
/**
* @var \OCP\IUser
*/
protected $user;
/**
* @var \OC\Files\Cache\ChangePropagator
*/
protected $changePropagator;
/**
* @var \OCP\IConfig
*/
protected $config;
/**
* @param \OCP\IUser $user current user, must match the propagator's
* user
* @param \OC\Files\Cache\ChangePropagator $changePropagator change propagator
* initialized with a view for $user
* @param \OCP\IConfig $config
*/
public function __construct($user, $changePropagator, $config) {
$this->user = $user;
$this->changePropagator = $changePropagator;
$this->config = $config;
}
/**
* Propagate the etag changes for all mountpoints marked as dirty and mark the mountpoints as clean
*
* @param int $time
*/
public function propagateDirtyMountPoints($time = null) {
if ($time === null) {
$time = time();
}
$mountPoints = $this->getDirtyMountPoints();
foreach ($mountPoints as $mountPoint) {
$this->changePropagator->addChange($mountPoint);
$this->config->setUserValue($this->user->getUID(), 'files_external', $mountPoint, $time);
}
if (count($mountPoints)) {
$this->changePropagator->propagateChanges($time);
}
}
/**
* Get all mountpoints we need to update the etag for
*
* @return string[]
*/
protected function getDirtyMountPoints() {
$dirty = array();
$mountPoints = $this->config->getAppKeys('files_external');
foreach ($mountPoints as $mountPoint) {
if (substr($mountPoint, 0, 1) === '/') {
$updateTime = $this->config->getAppValue('files_external', $mountPoint);
$userTime = $this->config->getUserValue($this->user->getUID(), 'files_external', $mountPoint);
if ($updateTime > $userTime) {
$dirty[] = $mountPoint;
}
}
}
return $dirty;
}
/**
* @param string $mountPoint
* @param int $time
*/
protected function markDirty($mountPoint, $time = null) {
if ($time === null) {
$time = time();
}
$this->config->setAppValue('files_external', $mountPoint, $time);
}
/**
* Update etags for mount points for known user
* For global or group mount points, updating the etag for every user is not feasible
* instead we mark the mount point as dirty and update the etag when the filesystem is loaded for the user
* For personal mount points, the change is propagated directly
*
* @param array $params hook parameters
* @param int $time update time to use when marking a mount point as dirty
*/
public function updateHook($params, $time = null) {
if ($time === null) {
$time = time();
}
$users = $params[Filesystem::signal_param_users];
$type = $params[Filesystem::signal_param_mount_type];
$mountPoint = $params[Filesystem::signal_param_path];
$mountPoint = Filesystem::normalizePath($mountPoint);
if ($type === \OC_Mount_Config::MOUNT_TYPE_GROUP or $users === 'all') {
$this->markDirty($mountPoint, $time);
} else {
$this->changePropagator->addChange($mountPoint);
$this->changePropagator->propagateChanges($time);
}
}
}
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