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<?php declare(strict_types=1);
/**
* @copyright Copyright (c) 2019 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\GroupFolders\ACL;
use OC\Cache\CappedMemoryCache;
use OCP\Constants;
use OCP\Files\IRootFolder;
use OCP\IUser;
class ACLManager {
private $ruleManager;
private $ruleCache;
private $user;
/** @var int|null */
private $rootStorageId = null;
private $rootFolderProvider;
public function __construct(RuleManager $ruleManager, IUser $user, callable $rootFolderProvider) {
$this->ruleManager = $ruleManager;
$this->ruleCache = new CappedMemoryCache();
$this->user = $user;
$this->rootFolderProvider = $rootFolderProvider;
}
private function getRootStorageId() {
if ($this->rootStorageId === null) {
$provider = $this->rootFolderProvider;
/** @var IRootFolder $rootFolder */
$rootFolder = $provider();
$this->rootStorageId = $rootFolder->getMountPoint()->getNumericStorageId();
}
return $this->rootStorageId;
}
/**
* @param int $folderId
* @param array $paths
* @return (Rule[])[]
*/
private function getRules(array $paths): array {
// beware: adding new rules to the cache besides the cap
// might discard former cached entries, so we can't assume they'll stay
// cached, so we read everything out initially to be able to return it
$rules = array_combine($paths, array_map(function (string $path) {
return $this->ruleCache->get($path);
}, $paths));
$nonCachedPaths = array_filter($paths, function (string $path) use ($rules) {
return !isset($rules[$path]);
});
if (!empty($nonCachedPaths)) {
$newRules = $this->ruleManager->getRulesForFilesByPath($this->user, $this->getRootStorageId(), $nonCachedPaths);
foreach ($newRules as $path => $rulesForPath) {
$this->ruleCache->set($path, $rulesForPath);
$rules[$path] = $rulesForPath;
}
}
ksort($rules);
return $rules;
}
/**
* @param string $path
* @return string[]
*/
private function getParents(string $path): array {
$paths = [$path];
while ($path !== '') {
$path = dirname($path);
if ($path === '.' || $path === '/') {
$path = '';
}
$paths[] = $path;
}
return $paths;
}
public function getACLPermissionsForPath(string $path): int {
$path = ltrim($path, '/');
$rules = $this->getRules($this->getParents($path));
return array_reduce($rules, function (int $permissions, array $rules) {
$mergedRule = Rule::mergeRules($rules);
return $mergedRule->applyPermissions($permissions);
}, Constants::PERMISSION_ALL);
}
/**
* Get the combined "lowest" permissions for an entire directory tree
*
* @param string $path
* @return int
*/
public function getPermissionsForTree(string $path): int {
$path = ltrim($path, '/');
$rules = $this->ruleManager->getRulesForPrefix($this->user, $this->getRootStorageId(), $path);
return array_reduce($rules, function (int $permissions, array $rules) {
$mergedRule = Rule::mergeRules($rules);
$invertedMask = ~$mergedRule->getMask();
// create a bitmask that has all inherit and allow bits set to 1 and all deny bits to 0
$denyMask = $invertedMask | $mergedRule->getPermissions();
// since we only care about the lower permissions, we ignore the allow values
return $permissions & $denyMask;
}, Constants::PERMISSION_ALL);
}
}
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