252 lines
9.9 KiB
PHP
252 lines
9.9 KiB
PHP
<?php
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/**
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* ownCloud
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*
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* @author Bjoern Schiessle
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* @copyright 2014 Bjoern Schiessle <schiessle@owncloud.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
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* License as published by the Free Software Foundation; either
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* version 3 of the License, or any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU AFFERO GENERAL PUBLIC LICENSE for more details.
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*
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* You should have received a copy of the GNU Affero General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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namespace OC\Share;
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class Helper extends \OC\Share\Constants {
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/**
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* Generate a unique target for the item
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* @param string $itemType
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* @param string $itemSource
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* @param int $shareType SHARE_TYPE_USER, SHARE_TYPE_GROUP, or SHARE_TYPE_LINK
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* @param string $shareWith User or group the item is being shared with
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* @param string $uidOwner User that is the owner of shared item
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* @param string $suggestedTarget The suggested target originating from a reshare (optional)
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* @param int $groupParent The id of the parent group share (optional)
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* @throws \Exception
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* @return string Item target
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*/
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public static function generateTarget($itemType, $itemSource, $shareType, $shareWith, $uidOwner,
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$suggestedTarget = null, $groupParent = null) {
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$backend = \OC\Share\Share::getBackend($itemType);
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if ($shareType == self::SHARE_TYPE_LINK) {
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if (isset($suggestedTarget)) {
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return $suggestedTarget;
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}
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return $backend->generateTarget($itemSource, false);
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} else {
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if ($itemType == 'file' || $itemType == 'folder') {
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$column = 'file_target';
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$columnSource = 'file_source';
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} else {
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$column = 'item_target';
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$columnSource = 'item_source';
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}
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if ($shareType == self::SHARE_TYPE_USER) {
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// Share with is a user, so set share type to user and groups
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$shareType = self::$shareTypeUserAndGroups;
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$userAndGroups = array_merge(array($shareWith), \OC_Group::getUserGroups($shareWith));
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} else {
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$userAndGroups = false;
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}
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$exclude = null;
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// Backend has 3 opportunities to generate a unique target
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for ($i = 0; $i < 2; $i++) {
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// Check if suggested target exists first
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if ($i == 0 && isset($suggestedTarget)) {
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$target = $suggestedTarget;
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} else {
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if ($shareType == self::SHARE_TYPE_GROUP) {
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$target = $backend->generateTarget($itemSource, false, $exclude);
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} else {
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$target = $backend->generateTarget($itemSource, $shareWith, $exclude);
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}
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if (is_array($exclude) && in_array($target, $exclude)) {
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break;
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}
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}
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// Check if target already exists
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$checkTarget = \OC\Share\Share::getItems($itemType, $target, $shareType, $shareWith);
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if (!empty($checkTarget)) {
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foreach ($checkTarget as $item) {
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// Skip item if it is the group parent row
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if (isset($groupParent) && $item['id'] == $groupParent) {
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if (count($checkTarget) == 1) {
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return $target;
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} else {
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continue;
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}
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}
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if ($item['uid_owner'] == $uidOwner) {
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if ($itemType == 'file' || $itemType == 'folder') {
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$meta = \OC\Files\Filesystem::getFileInfo($itemSource);
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if ($item['file_source'] == $meta['fileid']) {
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return $target;
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}
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} else if ($item['item_source'] == $itemSource) {
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return $target;
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}
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}
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}
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if (!isset($exclude)) {
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$exclude = array();
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}
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// Find similar targets to improve backend's chances to generate a unqiue target
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if ($userAndGroups) {
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if ($column == 'file_target') {
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$checkTargets = \OC_DB::prepare('SELECT `'.$column.'` FROM `*PREFIX*share`'
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.' WHERE `item_type` IN (\'file\', \'folder\')'
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.' AND `share_type` IN (?,?,?)'
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.' AND `share_with` IN (\''.implode('\',\'', $userAndGroups).'\')');
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$result = $checkTargets->execute(array(self::SHARE_TYPE_USER, self::SHARE_TYPE_GROUP,
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self::$shareTypeGroupUserUnique));
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} else {
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$checkTargets = \OC_DB::prepare('SELECT `'.$column.'` FROM `*PREFIX*share`'
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.' WHERE `item_type` = ? AND `share_type` IN (?,?,?)'
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.' AND `share_with` IN (\''.implode('\',\'', $userAndGroups).'\')');
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$result = $checkTargets->execute(array($itemType, self::SHARE_TYPE_USER,
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self::SHARE_TYPE_GROUP, self::$shareTypeGroupUserUnique));
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}
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} else {
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if ($column == 'file_target') {
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$checkTargets = \OC_DB::prepare('SELECT `'.$column.'` FROM `*PREFIX*share`'
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.' WHERE `item_type` IN (\'file\', \'folder\')'
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.' AND `share_type` = ? AND `share_with` = ?');
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$result = $checkTargets->execute(array(self::SHARE_TYPE_GROUP, $shareWith));
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} else {
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$checkTargets = \OC_DB::prepare('SELECT `'.$column.'` FROM `*PREFIX*share`'
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.' WHERE `item_type` = ? AND `share_type` = ? AND `share_with` = ?');
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$result = $checkTargets->execute(array($itemType, self::SHARE_TYPE_GROUP, $shareWith));
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}
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}
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while ($row = $result->fetchRow()) {
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$exclude[] = $row[$column];
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}
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} else {
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return $target;
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}
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}
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}
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$message = 'Sharing backend registered for '.$itemType.' did not generate a unique target for '.$itemSource;
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\OC_Log::write('OCP\Share', $message, \OC_Log::ERROR);
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throw new \Exception($message);
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}
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/**
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* Delete all reshares of an item
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* @param int $parent Id of item to delete
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* @param bool $excludeParent If true, exclude the parent from the delete (optional)
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* @param string $uidOwner The user that the parent was shared with (optional)
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*/
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public static function delete($parent, $excludeParent = false, $uidOwner = null) {
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$ids = array($parent);
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$parents = array($parent);
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while (!empty($parents)) {
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$parents = "'".implode("','", $parents)."'";
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// Check the owner on the first search of reshares, useful for
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// finding and deleting the reshares by a single user of a group share
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if (count($ids) == 1 && isset($uidOwner)) {
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$query = \OC_DB::prepare('SELECT `id`, `uid_owner`, `item_type`, `item_target`, `parent`'
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.' FROM `*PREFIX*share` WHERE `parent` IN ('.$parents.') AND `uid_owner` = ?');
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$result = $query->execute(array($uidOwner));
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} else {
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$query = \OC_DB::prepare('SELECT `id`, `item_type`, `item_target`, `parent`, `uid_owner`'
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.' FROM `*PREFIX*share` WHERE `parent` IN ('.$parents.')');
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$result = $query->execute();
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}
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// Reset parents array, only go through loop again if items are found
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$parents = array();
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while ($item = $result->fetchRow()) {
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// Search for a duplicate parent share, this occurs when an
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// item is shared to the same user through a group and user or the
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// same item is shared by different users
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$userAndGroups = array_merge(array($item['uid_owner']), \OC_Group::getUserGroups($item['uid_owner']));
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$query = \OC_DB::prepare('SELECT `id`, `permissions` FROM `*PREFIX*share`'
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.' WHERE `item_type` = ?'
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.' AND `item_target` = ?'
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.' AND `share_type` IN (?,?,?)'
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.' AND `share_with` IN (\''.implode('\',\'', $userAndGroups).'\')'
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.' AND `uid_owner` != ? AND `id` != ?');
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$duplicateParent = $query->execute(array($item['item_type'], $item['item_target'],
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self::SHARE_TYPE_USER, self::SHARE_TYPE_GROUP, self::$shareTypeGroupUserUnique,
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$item['uid_owner'], $item['parent']))->fetchRow();
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if ($duplicateParent) {
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// Change the parent to the other item id if share permission is granted
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if ($duplicateParent['permissions'] & \OCP\PERMISSION_SHARE) {
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$query = \OC_DB::prepare('UPDATE `*PREFIX*share` SET `parent` = ? WHERE `id` = ?');
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$query->execute(array($duplicateParent['id'], $item['id']));
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continue;
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}
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}
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$ids[] = $item['id'];
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$parents[] = $item['id'];
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}
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}
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if ($excludeParent) {
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unset($ids[0]);
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}
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if (!empty($ids)) {
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$ids = "'".implode("','", $ids)."'";
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$query = \OC_DB::prepare('DELETE FROM `*PREFIX*share` WHERE `id` IN ('.$ids.')');
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$query->execute();
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}
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}
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/**
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* get default expire settings defined by the admin
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* @return array contains 'defaultExpireDateSet', 'enforceExpireDate', 'expireAfterDays'
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*/
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public static function getDefaultExpireSetting() {
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$defaultExpireSettings = array('defaultExpireDateSet' => false);
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// get default expire settings
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$defaultExpireDate = \OC_Appconfig::getValue('core', 'shareapi_default_expire_date', 'no');
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if ($defaultExpireDate === 'yes') {
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$enforceExpireDate = \OC_Appconfig::getValue('core', 'shareapi_enforce_expire_date', 'no');
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$defaultExpireSettings['defaultExpireDateSet'] = true;
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$defaultExpireSettings['expireAfterDays'] = (int)\OC_Appconfig::getValue('core', 'shareapi_expire_after_n_days', '7');
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$defaultExpireSettings['enforceExpireDate'] = $enforceExpireDate === 'yes' ? true : false;
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}
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return $defaultExpireSettings;
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}
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/**
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* calculate expire date
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* @param array $defaultExpireSettings contains 'defaultExpireDateSet', 'enforceExpireDate', 'expireAfterDays'
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* @param int $creationTime timestamp when the share was created
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* @param int $userExpireDate expire timestamp set by the user
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* @return mixed integer timestamp or False
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*/
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public static function calculateExpireDate($defaultExpireSettings, $creationTime, $userExpireDate = null) {
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$expires = false;
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if (!empty($defaultExpireSettings['defaultExpireDateSet'])) {
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$expires = $creationTime + $defaultExpireSettings['expireAfterDays'] * 86400;
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}
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if (isset($userExpireDate)) {
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// if the admin decided to enforce the default expire date then we only take
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// the user defined expire date of it is before the default expire date
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if ($expires && !empty($defaultExpireSettings['enforceExpireDate'])) {
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$expires = min($userExpireDate, $expires);
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} else {
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$expires = $userExpireDate;
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}
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}
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return $expires;
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}
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}
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