245 lines
9.7 KiB
PHP
245 lines
9.7 KiB
PHP
<?php
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/**
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* ownCloud
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*
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* @author Michael Gapczynski
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* @copyright 2011 Michael Gapczynski GapczynskiM@gmail.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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*/
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/**
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* This class manages shared items within the database.
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*/
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class OC_SHARE {
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/**
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* TODO notify user a file is being shared with them?
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* Share an item, adds an entry into the database
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* @param string $item
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* @param user item shared with $uid_shared_with
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*/
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public function __construct($source, $uid_shared_with, $permissions, $public = false) {
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if ($source && OC_FILESYSTEM::file_exists($source) && OC_FILESYSTEM::is_readable($source)) {
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$uid_owner = $_SESSION['user_id'];
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if ($public) {
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// TODO create token for public file
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$token = sha1("$uid_owner-$item");
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} else {
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$query = OC_DB::prepare("INSERT INTO *PREFIX*sharing VALUES(?,?,?,?,?)");
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$sourceLocalPath = substr($source, strlen("/".$uid_owner."/files/"));;
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foreach ($uid_shared_with as $uid) {
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// TODO check to see if target already exists in database
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$target = "/".$uid."/files/Share/".$sourceLocalPath;
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$query->execute(array($uid_owner, $uid, $source, $target, $permissions));
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}
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}
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}
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}
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/**
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* Create a new entry in the database for a file inside a shared folder
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*
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* $oldTarget and $newTarget may be the same value. $oldTarget exists in case the file is being moved outside of the folder
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*
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* @param $oldTarget The current target location
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* @param $newTarget The new target location
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*/
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public static function pullOutOfFolder($oldTarget, $newTarget) {
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$folders = self::getParentFolders($oldTarget);
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$source = $folders['source'].substr($target, strlen($folders['target']));
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$item = self::getItem($folders['target']);
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$query = OC_DB::prepare("INSERT INTO *PREFIX*sharing VALUES(?,?,?,?,?)");
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$query->execute(array($item[0]['uid_owner'], $_SESSION['user_id'], $source, $newTarget, $item[0]['is_writeable']));
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}
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/**
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* Get the item with the specified target location
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* @param $target The target location of the item
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* @return An array with the item
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*/
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public static function getItem($target) {
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$query = OC_DB::prepare("SELECT uid_owner, source, is_writeable FROM *PREFIX*sharing WHERE target = ? AND uid_shared_with = ? LIMIT 1");
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return $query->execute(array($target, $_SESSION['user_id']))->fetchAll();
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}
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/**
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* Get all items the current user is sharing
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* @return An array with all items the user is sharing
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*/
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public static function getMySharedItems() {
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$query = OC_DB::prepare("SELECT uid_shared_with, source, is_writeable FROM *PREFIX*sharing WHERE uid_owner = ?");
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return $query->execute(array($_SESSION['user_id']))->fetchAll();
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}
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/**
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* Get the items within a shared folder that have their own entry for the purpose of name, location, or permissions that differ from the folder itself
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*
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* Also can be used for getting all item shared with you e.g. pass '/MTGap/files'
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*
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* @param $targetFolder The target folder of the items to look for
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* @return An array with all items in the database that are in the target folder
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*/
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public static function getItemsInFolder($targetFolder) {
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// Append '/' in order to filter out the folder itself if not already there
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if (substr($targetFolder, -1) !== "/") {
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$targetFolder .= "/";
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}
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$query = OC_DB::prepare("SELECT uid_owner, source, target FROM *PREFIX*sharing WHERE target COLLATE latin1_bin LIKE ? AND uid_shared_with = ?");
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return $query->execute(array($targetFolder."%", $_SESSION['user_id']))->fetchAll();
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}
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/**
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* Get the source and target parent folders of the specified target location
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* @param $target The target location of the item
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* @return An array with the keys 'source' and 'target' with the values of the source and target parent folders
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*/
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public static function getParentFolders($target) {
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// Remove any duplicate or trailing '/'
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$target = rtrim($target, "/");
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$target = preg_replace('{(/)\1+}', "/", $target);
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$query = OC_DB::prepare("SELECT source FROM *PREFIX*sharing WHERE target = ? AND uid_shared_with = ? LIMIT 1");
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// Prevent searching for user directory e.g. '/MTGap/files'
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$userDirectory = substr($target, 0, strpos($target, "files") + 5);
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while ($target != "" && $target != "/" && $target != "." && $target != $userDirectory) {
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// Check if the parent directory of this target location is shared
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$target = dirname($target);
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$result = $query->execute(array($target, $_SESSION['user_id']))->fetchAll();
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if (count($result) > 0) {
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break;
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}
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}
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if (count($result) > 0) {
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// Return both the source folder and the target folder
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return array("source" => $result[0]['source'], "target" => $target);
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} else {
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return false;
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}
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}
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/**
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* Get the source location of the item at the specified target location
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* @param $target The target location of the item
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* @return Source location or false if target location is not valid
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*/
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public static function getSource($target) {
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// Remove any duplicate or trailing '/'
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$target = rtrim($target, "/");
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$target = preg_replace('{(/)\1+}', "/", $target);
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$query = OC_DB::prepare("SELECT source FROM *PREFIX*sharing WHERE target = ? AND uid_shared_with = ? LIMIT 1");
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$result = $query->execute(array($target, $_SESSION['user_id']))->fetchAll();
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if (count($result) > 0) {
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return $result[0]['source'];
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} else {
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$folders = self::getParentFolders($target);
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if ($folders == false) {
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return false;
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} else {
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return $folders['source'].substr($target, strlen($folders['target']));
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}
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}
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}
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/**
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* Check if the user has write permission for the item at the specified target location
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* @param $target The target location of the item
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* @return True if the user has write permission or false if read only
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*/
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public static function isWriteable($target) {
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$query = OC_DB::prepare("SELECT is_writeable FROM *PREFIX*sharing WHERE target = ? AND uid_shared_with = ? LIMIT 1");
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$result = $query->execute(array($target, $_SESSION['user_id']))->fetchAll();
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if (count($result) > 0) {
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return $result[0]['is_writeable'];
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} else {
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// Check if the folder is writeable
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$folders = OC_SHARE::getParentFolders($target);
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$result = $query->execute(array($folders['target'], $_SESSION['user_id']))->fetchAll();
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if (count($result) > 0) {
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return $result[0]['is_writeable'];
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} else {
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return false;
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}
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}
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}
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/**
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* Set the source location to a new value
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* @param $oldSource The current source location
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* @param $newTarget The new source location
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*/
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public static function setSource($oldSource, $newSource) {
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$query = OC_DB::prepare("UPDATE *PREFIX*sharing SET source = REPLACE(source, ?, ?) WHERE uid_owner = ?");
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$query->execute(array($oldSource, $newSource, $_SESSION['user_id']));
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}
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/**
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* Set the target location to a new value
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*
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* You must use the pullOutOfFolder() function to change the target location of a file inside a shared folder if the target location differs from the folder
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*
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* @param $oldTarget The current target location
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* @param $newTarget The new target location
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*/
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public static function setTarget($oldTarget, $newTarget) {
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$query = OC_DB::prepare("UPDATE *PREFIX*sharing SET target = REPLACE(target, ?, ?) WHERE uid_shared_with = ?");
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$query->execute(array($oldTarget, $newTarget, $_SESSION['user_id']));
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}
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/**
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* Change write permission for the specified item and user
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*
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* You must construct a new shared item to change the write permission of a file inside a shared folder if the write permission differs from the folder
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*
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* @param $source The source location of the item
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* @param $uid_shared_with Array of users to change the write permission for
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* @param $is_writeable True if the user has write permission or false if read only
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*/
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public static function setIsWriteable($source, $uid_shared_with, $is_writeable) {
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$query = OC_DB::prepare("UPDATE *PREFIX*sharing SET is_writeable = ? WHERE source COLLATE latin1_bin LIKE ? AND uid_shared_with = ? AND uid_owner = ?");
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foreach ($uid_shared_with as $uid) {
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$query->execute(array($is_writeable, $source."%", $uid_shared_with, $_SESSION['user_id']));
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}
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}
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/**
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* Unshare the item, removes it from all specified users
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*
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* You must use the pullOutOfFolder() function to unshare a file inside a shared folder and set $newTarget to nothing
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*
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* @param $source The source location of the item
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* @param $uid_shared_with Array of users to unshare the item from
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*/
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public static function unshare($source, $uid_shared_with) {
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$query = OC_DB::prepare("DELETE FROM *PREFIX*sharing WHERE source COLLATE latin1_bin LIKE ? AND uid_shared_with = ? AND uid_owner = ?");
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foreach ($uid_shared_with as $uid) {
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$query->execute(array($source."%", $uid, $_SESSION['user_id']));
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}
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}
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/**
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* Unshare the item from the current user, removes it only from the database and doesn't touch the source file
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*
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* You must use the pullOutOfFolder() function to unshare a file inside a shared folder and set $newTarget to nothing
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*
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* @param $target The target location of the item
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*/
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public static function unshareFromMySelf($target) {
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$query = OC_DB::prepare("DELETE FROM *PREFIX*sharing WHERE target COLLATE latin1_bin LIKE ? AND uid_shared_with = ?");
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$query->execute(array($target."%", $_SESSION['user_id']));
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}
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}
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?>
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