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259 lines
8.5 KiB
PHP
259 lines
8.5 KiB
PHP
<?php
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/**
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* SPDX-FileCopyrightText: 2016-2024 Nextcloud GmbH and Nextcloud contributors
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* SPDX-FileCopyrightText: 2016 ownCloud, Inc.
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* SPDX-License-Identifier: AGPL-3.0-only
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*/
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namespace OCA\Files_Sharing;
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use OC\Files\View;
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use OCA\Files_Sharing\Event\ShareMountedEvent;
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use OCP\Cache\CappedMemoryCache;
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use OCP\EventDispatcher\IEventDispatcher;
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use OCP\Files\Config\IMountProvider;
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use OCP\Files\Mount\IMountPoint;
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use OCP\Files\Storage\IStorageFactory;
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use OCP\ICacheFactory;
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use OCP\IConfig;
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use OCP\IUser;
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use OCP\Share\IManager;
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use OCP\Share\IShare;
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use Psr\Log\LoggerInterface;
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class MountProvider implements IMountProvider {
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/**
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* @param IConfig $config
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* @param IManager $shareManager
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* @param LoggerInterface $logger
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*/
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public function __construct(
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protected IConfig $config,
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protected IManager $shareManager,
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protected LoggerInterface $logger,
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protected IEventDispatcher $eventDispatcher,
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protected ICacheFactory $cacheFactory,
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) {
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}
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/**
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* Get all mountpoints applicable for the user and check for shares where we need to update the etags
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*
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* @param IUser $user
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* @param IStorageFactory $loader
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* @return IMountPoint[]
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*/
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public function getMountsForUser(IUser $user, IStorageFactory $loader) {
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$shares = $this->shareManager->getSharedWith($user->getUID(), IShare::TYPE_USER, null, -1);
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$shares = array_merge($shares, $this->shareManager->getSharedWith($user->getUID(), IShare::TYPE_GROUP, null, -1));
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$shares = array_merge($shares, $this->shareManager->getSharedWith($user->getUID(), IShare::TYPE_CIRCLE, null, -1));
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$shares = array_merge($shares, $this->shareManager->getSharedWith($user->getUID(), IShare::TYPE_ROOM, null, -1));
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$shares = array_merge($shares, $this->shareManager->getSharedWith($user->getUID(), IShare::TYPE_DECK, null, -1));
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$shares = array_merge($shares, $this->shareManager->getSharedWith($user->getUID(), IShare::TYPE_SCIENCEMESH, null, -1));
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// filter out excluded shares and group shares that includes self
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$shares = array_filter($shares, function (IShare $share) use ($user) {
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return $share->getPermissions() > 0 && $share->getShareOwner() !== $user->getUID();
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});
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$superShares = $this->buildSuperShares($shares, $user);
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$mounts = [];
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$view = new View('/' . $user->getUID() . '/files');
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$ownerViews = [];
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$sharingDisabledForUser = $this->shareManager->sharingDisabledForUser($user->getUID());
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/** @var CappedMemoryCache<bool> $folderExistCache */
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$foldersExistCache = new CappedMemoryCache();
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foreach ($superShares as $share) {
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try {
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/** @var IShare $parentShare */
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$parentShare = $share[0];
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if ($parentShare->getStatus() !== IShare::STATUS_ACCEPTED &&
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($parentShare->getShareType() === IShare::TYPE_GROUP ||
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$parentShare->getShareType() === IShare::TYPE_USERGROUP ||
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$parentShare->getShareType() === IShare::TYPE_USER)) {
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continue;
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}
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$owner = $parentShare->getShareOwner();
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if (!isset($ownerViews[$owner])) {
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$ownerViews[$owner] = new View('/' . $parentShare->getShareOwner() . '/files');
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}
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$mount = new SharedMount(
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'\OCA\Files_Sharing\SharedStorage',
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$mounts,
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[
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'user' => $user->getUID(),
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// parent share
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'superShare' => $parentShare,
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// children/component of the superShare
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'groupedShares' => $share[1],
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'ownerView' => $ownerViews[$owner],
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'sharingDisabledForUser' => $sharingDisabledForUser
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],
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$loader,
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$view,
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$foldersExistCache,
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$this->eventDispatcher,
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$user,
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$this->cacheFactory->createLocal('share-valid-mountpoint')
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);
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$event = new ShareMountedEvent($mount);
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$this->eventDispatcher->dispatchTyped($event);
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$mounts[$mount->getMountPoint()] = $mount;
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foreach ($event->getAdditionalMounts() as $additionalMount) {
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$mounts[$additionalMount->getMountPoint()] = $additionalMount;
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}
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} catch (\Exception $e) {
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$this->logger->error(
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'Error while trying to create shared mount',
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[
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'app' => 'files_sharing',
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'exception' => $e,
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],
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);
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}
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}
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// array_filter removes the null values from the array
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return array_values(array_filter($mounts));
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}
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/**
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* Groups shares by path (nodeId) and target path
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*
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* @param IShare[] $shares
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* @return IShare[][] array of grouped shares, each element in the
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* array is a group which itself is an array of shares
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*/
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private function groupShares(array $shares) {
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$tmp = [];
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foreach ($shares as $share) {
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if (!isset($tmp[$share->getNodeId()])) {
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$tmp[$share->getNodeId()] = [];
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}
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$tmp[$share->getNodeId()][] = $share;
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}
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$result = [];
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// sort by stime, the super share will be based on the least recent share
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foreach ($tmp as &$tmp2) {
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@usort($tmp2, function ($a, $b) {
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$aTime = $a->getShareTime()->getTimestamp();
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$bTime = $b->getShareTime()->getTimestamp();
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if ($aTime === $bTime) {
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return $a->getId() < $b->getId() ? -1 : 1;
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}
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return $aTime < $bTime ? -1 : 1;
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});
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$result[] = $tmp2;
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}
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return array_values($result);
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}
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/**
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* Build super shares (virtual share) by grouping them by node id and target,
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* then for each group compute the super share and return it along with the matching
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* grouped shares. The most permissive permissions are used based on the permissions
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* of all shares within the group.
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*
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* @param IShare[] $allShares
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* @param IUser $user user
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* @return array Tuple of [superShare, groupedShares]
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*/
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private function buildSuperShares(array $allShares, IUser $user) {
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$result = [];
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$groupedShares = $this->groupShares($allShares);
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/** @var IShare[] $shares */
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foreach ($groupedShares as $shares) {
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if (count($shares) === 0) {
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continue;
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}
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$superShare = $this->shareManager->newShare();
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// compute super share based on first entry of the group
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$superShare->setId($shares[0]->getId())
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->setShareOwner($shares[0]->getShareOwner())
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->setNodeId($shares[0]->getNodeId())
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->setShareType($shares[0]->getShareType())
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->setTarget($shares[0]->getTarget());
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// Gather notes from all the shares.
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// Since these are readly available here, storing them
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// enables the DAV FilesPlugin to avoid executing many
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// DB queries to retrieve the same information.
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$allNotes = implode("\n", array_map(function ($sh) {
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return $sh->getNote();
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}, $shares));
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$superShare->setNote($allNotes);
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// use most permissive permissions
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// this covers the case where there are multiple shares for the same
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// file e.g. from different groups and different permissions
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$superPermissions = 0;
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$superAttributes = $this->shareManager->newShare()->newAttributes();
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$status = IShare::STATUS_PENDING;
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foreach ($shares as $share) {
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$superPermissions |= $share->getPermissions();
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$status = max($status, $share->getStatus());
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// update permissions
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$superPermissions |= $share->getPermissions();
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// update share permission attributes
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$attributes = $share->getAttributes();
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if ($attributes !== null) {
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foreach ($attributes->toArray() as $attribute) {
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if ($superAttributes->getAttribute($attribute['scope'], $attribute['key']) === true) {
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// if super share attribute is already enabled, it is most permissive
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continue;
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}
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// update supershare attributes with subshare attribute
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$superAttributes->setAttribute($attribute['scope'], $attribute['key'], $attribute['value']);
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}
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}
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// adjust target, for database consistency if needed
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if ($share->getTarget() !== $superShare->getTarget()) {
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$share->setTarget($superShare->getTarget());
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try {
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$this->shareManager->moveShare($share, $user->getUID());
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} catch (\InvalidArgumentException $e) {
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// ignore as it is not important and we don't want to
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// block FS setup
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// the subsequent code anyway only uses the target of the
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// super share
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// such issue can usually happen when dealing with
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// null groups which usually appear with group backend
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// caching inconsistencies
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$this->logger->debug(
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'Could not adjust share target for share ' . $share->getId() . ' to make it consistent: ' . $e->getMessage(),
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['app' => 'files_sharing']
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);
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}
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}
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if (!is_null($share->getNodeCacheEntry())) {
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$superShare->setNodeCacheEntry($share->getNodeCacheEntry());
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}
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}
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$superShare->setPermissions($superPermissions);
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$superShare->setStatus($status);
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$superShare->setAttributes($superAttributes);
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$result[] = [$superShare, $shares];
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}
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return $result;
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}
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}
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