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<?php
/**
* ownCloud
*
* @author Bjoern Schiessle
* @copyright 2014 Bjoern Schiessle <schiessle@owncloud.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
* License as published by the Free Software Foundation; either
* version 3 of the License, or any later version.
*
* This library 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 library. If not, see <http://www.gnu.org/licenses/>.
*/
namespace OC\Share;
class Helper extends \OC\Share\Constants {
/**
* Generate a unique target for the item
* @param string $itemType
* @param string $itemSource
* @param int $shareType SHARE_TYPE_USER, SHARE_TYPE_GROUP, or SHARE_TYPE_LINK
* @param string $shareWith User or group the item is being shared with
* @param string $uidOwner User that is the owner of shared item
* @param string $suggestedTarget The suggested target originating from a reshare (optional)
* @param int $groupParent The id of the parent group share (optional)
* @throws \Exception
* @return string Item target
*/
public static function generateTarget($itemType, $itemSource, $shareType, $shareWith, $uidOwner,
$suggestedTarget = null, $groupParent = null) {
$backend = \OC\Share\Share::getBackend($itemType);
if ($shareType == self::SHARE_TYPE_LINK) {
if (isset($suggestedTarget)) {
return $suggestedTarget;
}
return $backend->generateTarget($itemSource, false);
} else {
if ($itemType == 'file' || $itemType == 'folder') {
$column = 'file_target';
$columnSource = 'file_source';
} else {
$column = 'item_target';
$columnSource = 'item_source';
}
if ($shareType == self::SHARE_TYPE_USER) {
// Share with is a user, so set share type to user and groups
$shareType = self::$shareTypeUserAndGroups;
$userAndGroups = array_merge(array($shareWith), \OC_Group::getUserGroups($shareWith));
} else {
$userAndGroups = false;
}
$exclude = null;
// Backend has 3 opportunities to generate a unique target
for ($i = 0; $i < 2; $i++) {
// Check if suggested target exists first
if ($i == 0 && isset($suggestedTarget)) {
$target = $suggestedTarget;
} else {
if ($shareType == self::SHARE_TYPE_GROUP) {
$target = $backend->generateTarget($itemSource, false, $exclude);
} else {
$target = $backend->generateTarget($itemSource, $shareWith, $exclude);
}
if (is_array($exclude) && in_array($target, $exclude)) {
break;
}
}
// Check if target already exists
$checkTarget = \OC\Share\Share::getItems($itemType, $target, $shareType, $shareWith);
if (!empty($checkTarget)) {
foreach ($checkTarget as $item) {
// Skip item if it is the group parent row
if (isset($groupParent) && $item['id'] == $groupParent) {
if (count($checkTarget) == 1) {
return $target;
} else {
continue;
}
}
if ($item['uid_owner'] == $uidOwner) {
if ($itemType == 'file' || $itemType == 'folder') {
$meta = \OC\Files\Filesystem::getFileInfo($itemSource);
if ($item['file_source'] == $meta['fileid']) {
return $target;
}
} else if ($item['item_source'] == $itemSource) {
return $target;
}
}
}
if (!isset($exclude)) {
$exclude = array();
}
// Find similar targets to improve backend's chances to generate a unqiue target
if ($userAndGroups) {
if ($column == 'file_target') {
$checkTargets = \OC_DB::prepare('SELECT `'.$column.'` FROM `*PREFIX*share`'
.' WHERE `item_type` IN (\'file\', \'folder\')'
.' AND `share_type` IN (?,?,?)'
.' AND `share_with` IN (\''.implode('\',\'', $userAndGroups).'\')');
$result = $checkTargets->execute(array(self::SHARE_TYPE_USER, self::SHARE_TYPE_GROUP,
self::$shareTypeGroupUserUnique));
} else {
$checkTargets = \OC_DB::prepare('SELECT `'.$column.'` FROM `*PREFIX*share`'
.' WHERE `item_type` = ? AND `share_type` IN (?,?,?)'
.' AND `share_with` IN (\''.implode('\',\'', $userAndGroups).'\')');
$result = $checkTargets->execute(array($itemType, self::SHARE_TYPE_USER,
self::SHARE_TYPE_GROUP, self::$shareTypeGroupUserUnique));
}
} else {
if ($column == 'file_target') {
$checkTargets = \OC_DB::prepare('SELECT `'.$column.'` FROM `*PREFIX*share`'
.' WHERE `item_type` IN (\'file\', \'folder\')'
.' AND `share_type` = ? AND `share_with` = ?');
$result = $checkTargets->execute(array(self::SHARE_TYPE_GROUP, $shareWith));
} else {
$checkTargets = \OC_DB::prepare('SELECT `'.$column.'` FROM `*PREFIX*share`'
.' WHERE `item_type` = ? AND `share_type` = ? AND `share_with` = ?');
$result = $checkTargets->execute(array($itemType, self::SHARE_TYPE_GROUP, $shareWith));
}
}
while ($row = $result->fetchRow()) {
$exclude[] = $row[$column];
}
} else {
return $target;
}
}
}
$message = 'Sharing backend registered for '.$itemType.' did not generate a unique target for '.$itemSource;
\OC_Log::write('OCP\Share', $message, \OC_Log::ERROR);
throw new \Exception($message);
}
/**
* Delete all reshares of an item
* @param int $parent Id of item to delete
* @param bool $excludeParent If true, exclude the parent from the delete (optional)
* @param string $uidOwner The user that the parent was shared with (optional)
*/
public static function delete($parent, $excludeParent = false, $uidOwner = null) {
$ids = array($parent);
$parents = array($parent);
while (!empty($parents)) {
$parents = "'".implode("','", $parents)."'";
// Check the owner on the first search of reshares, useful for
// finding and deleting the reshares by a single user of a group share
if (count($ids) == 1 && isset($uidOwner)) {
$query = \OC_DB::prepare('SELECT `id`, `uid_owner`, `item_type`, `item_target`, `parent`'
.' FROM `*PREFIX*share` WHERE `parent` IN ('.$parents.') AND `uid_owner` = ?');
$result = $query->execute(array($uidOwner));
} else {
$query = \OC_DB::prepare('SELECT `id`, `item_type`, `item_target`, `parent`, `uid_owner`'
.' FROM `*PREFIX*share` WHERE `parent` IN ('.$parents.')');
$result = $query->execute();
}
// Reset parents array, only go through loop again if items are found
$parents = array();
while ($item = $result->fetchRow()) {
// Search for a duplicate parent share, this occurs when an
// item is shared to the same user through a group and user or the
// same item is shared by different users
$userAndGroups = array_merge(array($item['uid_owner']), \OC_Group::getUserGroups($item['uid_owner']));
$query = \OC_DB::prepare('SELECT `id`, `permissions` FROM `*PREFIX*share`'
.' WHERE `item_type` = ?'
.' AND `item_target` = ?'
.' AND `share_type` IN (?,?,?)'
.' AND `share_with` IN (\''.implode('\',\'', $userAndGroups).'\')'
.' AND `uid_owner` != ? AND `id` != ?');
$duplicateParent = $query->execute(array($item['item_type'], $item['item_target'],
self::SHARE_TYPE_USER, self::SHARE_TYPE_GROUP, self::$shareTypeGroupUserUnique,
$item['uid_owner'], $item['parent']))->fetchRow();
if ($duplicateParent) {
// Change the parent to the other item id if share permission is granted
if ($duplicateParent['permissions'] & \OCP\PERMISSION_SHARE) {
$query = \OC_DB::prepare('UPDATE `*PREFIX*share` SET `parent` = ? WHERE `id` = ?');
$query->execute(array($duplicateParent['id'], $item['id']));
continue;
}
}
$ids[] = $item['id'];
$parents[] = $item['id'];
}
}
if ($excludeParent) {
unset($ids[0]);
}
if (!empty($ids)) {
$ids = "'".implode("','", $ids)."'";
$query = \OC_DB::prepare('DELETE FROM `*PREFIX*share` WHERE `id` IN ('.$ids.')');
$query->execute();
}
}
/**
* get default expire settings defined by the admin
* @return array contains 'defaultExpireDateSet', 'enforceExpireDate', 'expireAfterDays'
*/
public static function getDefaultExpireSetting() {
$defaultExpireSettings = array('defaultExpireDateSet' => false);
// get default expire settings
$defaultExpireDate = \OC_Appconfig::getValue('core', 'shareapi_default_expire_date', 'no');
if ($defaultExpireDate === 'yes') {
$enforceExpireDate = \OC_Appconfig::getValue('core', 'shareapi_enforce_expire_date', 'no');
$defaultExpireSettings['defaultExpireDateSet'] = true;
$defaultExpireSettings['expireAfterDays'] = (int)\OC_Appconfig::getValue('core', 'shareapi_expire_after_n_days', '7');
$defaultExpireSettings['enforceExpireDate'] = $enforceExpireDate === 'yes' ? true : false;
}
return $defaultExpireSettings;
}
/**
* calculate expire date
* @param array $defaultExpireSettings contains 'defaultExpireDateSet', 'enforceExpireDate', 'expireAfterDays'
* @param int $creationTime timestamp when the share was created
* @param int $userExpireDate expire timestamp set by the user
* @return mixed integer timestamp or False
*/
public static function calculateExpireDate($defaultExpireSettings, $creationTime, $userExpireDate = null) {
$expires = false;
if (!empty($defaultExpireSettings['defaultExpireDateSet'])) {
$expires = $creationTime + $defaultExpireSettings['expireAfterDays'] * 86400;
}
if (isset($userExpireDate)) {
// if the admin decided to enforce the default expire date then we only take
// the user defined expire date of it is before the default expire date
if ($expires && !empty($defaultExpireSettings['enforceExpireDate'])) {
$expires = min($userExpireDate, $expires);
} else {
$expires = $userExpireDate;
}
}
return $expires;
}
}
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