/**
* 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);
}
