nextcloud/apps/files_sharing/lib_share.php

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<?php
/**
* ownCloud
*
* @author Michael Gapczynski
* @copyright 2011 Michael Gapczynski GapczynskiM@gmail.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/>.
*
*/
/**
* This class manages shared items within the database.
*/
class OC_Share {
const WRITE = 1;
const DELETE = 2;
const UNSHARED = -1;
const PUBLICLINK = "public";
private $token;
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/**
* Share an item, adds an entry into the database
* @param $source The source location of the item
* @param $uid_shared_with The user or group to share the item with
* @param $permissions The permissions, use the constants WRITE and DELETE
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*/
public function __construct($source, $uid_shared_with, $permissions) {
$uid_owner = OC_User::getUser();
$query = OC_DB::prepare("INSERT INTO *PREFIX*sharing VALUES(?,?,?,?,?)");
if ($uid_shared_with == self::PUBLICLINK) {
$token = sha1("$uid_shared_with-$source");
$query->execute(array($uid_owner, self::PUBLICLINK, $source, $token, $permissions));
$this->token = $token;
} else {
if (OC_Group::groupExists($uid_shared_with)) {
$gid = $uid_shared_with;
$uid_shared_with = OC_Group::usersInGroup($gid);
// Remove the owner from the list of users in the group
$uid_shared_with = array_diff($uid_shared_with, array($uid_owner));
} else if (OC_User::userExists($uid_shared_with)) {
$gid = null;
$uid_shared_with = array($uid_shared_with);
} else {
throw new Exception($uid_shared_with." is not a user");
}
foreach ($uid_shared_with as $uid) {
// Check if this item is already shared with the user
$checkSource = OC_DB::prepare("SELECT source FROM *PREFIX*sharing WHERE source = ? AND uid_shared_with ".self::getUsersAndGroups($uid));
$resultCheckSource = $checkSource->execute(array($source, $uid))->fetchAll();
// TODO Check if the source is inside a folder
if (count($resultCheckSource) > 0 && !isset($gid)) {
throw new Exception("This item is already shared with ".$uid);
}
// Check if the target already exists for the user, if it does append a number to the name
$sharedFolder = "/".$uid."/files/Shared";
$target = $sharedFolder."/".basename($source);
if (self::getSource($target)) {
if ($pos = strrpos($target, ".")) {
$name = substr($target, 0, $pos);
$ext = substr($target, $pos);
} else {
$name = $target;
$ext = "";
}
$counter = 1;
while ($checkTarget !== false) {
$newTarget = $name."_".$counter.$ext;
$checkTarget = self::getSource($newTarget);
$counter++;
}
$target = $newTarget;
}
if (isset($gid)) {
$uid = $uid."@".$gid;
}
$query->execute(array($uid_owner, $uid, $source, $target, $permissions));
// Clear the folder size cache for the 'Shared' folder
$clearFolderSize = OC_DB::prepare("DELETE FROM *PREFIX*foldersize WHERE path = ?");
$clearFolderSize->execute(array($sharedFolder));
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}
}
}
/**
* Remove any duplicate or trailing '/' from the path
* @return A clean path
*/
private static function cleanPath($path) {
$path = rtrim($path, "/");
return preg_replace('{(/)\1+}', "/", $path);
}
/**
* Generate a string to be used for searching for uid_shared_with that handles both users and groups
* @param $uid (Optional) The uid to get the user groups for, a gid to get the users in a group, or if not set the current user
* @return An IN operator as a string
*/
private static function getUsersAndGroups($uid = null) {
$in = " IN(";
if (isset($uid) && OC_Group::groupExists($uid)) {
$users = OC_Group::usersInGroup($uid);
foreach ($users as $user) {
// Add a comma only if the the current element isn't the last
if ($user !== end($users)) {
$in .= "'".$user."@".$uid."', ";
} else {
$in .= "'".$user."@".$uid."'";
}
}
} else if (isset($uid)) {
// TODO Check if this is necessary, only constructor needs it as IN. It would be better for other queries to just return =$uid
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$in .= "'".$uid."'";
$groups = OC_Group::getUserGroups($uid);
foreach ($groups as $group) {
$in .= ", '".$uid."@".$group."'";
}
} else {
$uid = OC_User::getUser();
$in .= "'".$uid."'";
$groups = OC_Group::getUserGroups($uid);
foreach ($groups as $group) {
$in .= ", '".$uid."@".$group."'";
}
}
$in .= ", '".self::PUBLICLINK."'";
$in .= ")";
return $in;
}
/**
* Create a new entry in the database for a file inside a shared folder
*
* $oldTarget and $newTarget may be the same value. $oldTarget exists in case the file is being moved outside of the folder
*
* @param $oldTarget The current target location
* @param $newTarget The new target location
*/
public static function pullOutOfFolder($oldTarget, $newTarget) {
$folders = self::getParentFolders($oldTarget);
$source = $folders['source'].substr($oldTarget, strlen($folders['target']));
$item = self::getItem($folders['target']);
$query = OC_DB::prepare("INSERT INTO *PREFIX*sharing VALUES(?,?,?,?,?)");
$query->execute(array($item[0]['uid_owner'], OC_User::getUser(), $source, $newTarget, $item[0]['permissions']));
}
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/**
* Get the item with the specified target location
* @param $target The target location of the item
* @return An array with the item
*/
public static function getItem($target) {
$target = self::cleanPath($target);
$query = OC_DB::prepare("SELECT uid_owner, source, permissions FROM *PREFIX*sharing WHERE target = ? AND uid_shared_with = ? LIMIT 1");
return $query->execute(array($target, OC_User::getUser()))->fetchAll();
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}
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/**
* Get the item with the specified source location
* @param $source The source location of the item
* @return An array with the users and permissions the item is shared with
*/
public static function getMySharedItem($source) {
$source = self::cleanPath($source);
$query = OC_DB::prepare("SELECT uid_shared_with, permissions FROM *PREFIX*sharing WHERE source = ? AND uid_owner = ?");
return $query->execute(array($source, OC_User::getUser()))->fetchAll();
}
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/**
* Get all items the current user is sharing
* @return An array with all items the user is sharing
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*/
public static function getMySharedItems() {
$query = OC_DB::prepare("SELECT uid_shared_with, source, permissions FROM *PREFIX*sharing WHERE uid_owner = ?");
return $query->execute(array(OC_User::getUser()))->fetchAll();
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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
*
* Works for both target and source folders. Can be used for getting all items shared with you e.g. pass '/MTGap/files'
*
* @param $folder The folder of the items to look for
* @return An array with all items in the database that are in the folder
*/
public static function getItemsInFolder($folder) {
$folder = self::cleanPath($folder);
// Append '/' in order to filter out the folder itself if not already there
if (substr($folder, -1) !== "/") {
$folder .= "/";
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}
$length = strlen($folder);
$query = OC_DB::prepare("SELECT uid_owner, source, target, permissions FROM *PREFIX*sharing WHERE SUBSTR(source, 1, ?) = ? OR SUBSTR(target, 1, ?) = ? AND uid_shared_with ".self::getUsersAndGroups());
return $query->execute(array($length, $folder, $length, $folder))->fetchAll();
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}
/**
* Get the source and target parent folders of the specified target location
* @param $target The target location of the item
* @return An array with the keys 'source' and 'target' with the values of the source and target parent folders
*/
public static function getParentFolders($target) {
$target = self::cleanPath($target);
$query = OC_DB::prepare("SELECT source FROM *PREFIX*sharing WHERE target = ? AND uid_shared_with".self::getUsersAndGroups()." LIMIT 1");
// Prevent searching for user directory e.g. '/MTGap/files'
$userDirectory = substr($target, 0, strpos($target, "files") + 5);
$target = dirname($target);
$result = array();
while ($target != "" && $target != "/" && $target != "." && $target != $userDirectory) {
// Check if the parent directory of this target location is shared
$result = $query->execute(array($target))->fetchAll();
if (count($result) > 0) {
break;
}
$target = dirname($target);
}
if (count($result) > 0) {
// Return both the source folder and the target folder
return array("source" => $result[0]['source'], "target" => $target);
} else {
return false;
}
}
/**
* Get the source location of the item at the specified target location
* @param $target The target location of the item
* @return Source location or false if target location is not valid
*/
public static function getSource($target) {
$target = self::cleanPath($target);
$query = OC_DB::prepare("SELECT source FROM *PREFIX*sharing WHERE target = ? AND uid_shared_with ".self::getUsersAndGroups()." LIMIT 1");
$result = $query->execute(array($target))->fetchAll();
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if (count($result) > 0) {
return $result[0]['source'];
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} else {
$folders = self::getParentFolders($target);
if ($folders == true) {
return $folders['source'].substr($target, strlen($folders['target']));
} else {
return false;
}
}
}
/**
* Get the user's permissions for the item at the specified target location
* @param $target The target location of the item
* @return The permissions, use bitwise operators to check against the constants WRITE and DELETE
*/
public static function getPermissions($target) {
$target = self::cleanPath($target);
$query = OC_DB::prepare("SELECT permissions FROM *PREFIX*sharing WHERE target = ? AND uid_shared_with ".self::getUsersAndGroups()." LIMIT 1");
$result = $query->execute(array($target))->fetchAll();
if (count($result) > 0) {
return $result[0]['permissions'];
} else {
$folders = self::getParentFolders($target);
if ($folders == true) {
$result = $query->execute(array($folders['target']))->fetchAll();
if (count($result) > 0) {
return $result[0]['permissions'];
}
} else {
return false;
}
}
}
/**
* Get the token for a public link
* @return The token of the public link, a sha1 hash
*/
public function getToken() {
return $this->token;
}
/**
* Get the token for a public link
* @param $source The source location of the item
* @return The token of the public link, a sha1 hash
*/
public static function getTokenFromSource($source) {
$query = OC_DB::prepare("SELECT target FROM *PREFIX*sharing WHERE source = ? AND uid_shared_with = ? AND uid_owner = ? LIMIT 1");
$result = $query->execute(array($source, self::PUBLICLINK, OC_User::getUser()))->fetchAll();
if (count($result) > 0) {
return $result[0]['target'];
} else {
return false;
}
}
/**
* Set the target location to a new value
*
* 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
*
* @param $oldTarget The current target location
* @param $newTarget The new target location
*/
public static function setTarget($oldTarget, $newTarget) {
$oldTarget = self::cleanPath($oldTarget);
$newTarget = self::cleanPath($newTarget);
$query = OC_DB::prepare("UPDATE *PREFIX*sharing SET target = REPLACE(target, ?, ?) WHERE uid_shared_with ".self::getUsersAndGroups());
$query->execute(array($oldTarget, $newTarget));
}
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/**
* Change the permissions for the specified item and user
*
* You must construct a new shared item to change the permissions of a file inside a shared folder if the permissions differ from the folder
*
* @param $source The source location of the item
* @param $uid_shared_with The user to change the permissions for
* @param $permissions The permissions, use the constants WRITE and DELETE
*/
public static function setPermissions($source, $uid_shared_with, $permissions) {
$source = self::cleanPath($source);
$query = OC_DB::prepare("UPDATE *PREFIX*sharing SET permissions = ? WHERE SUBSTR(source, 1, ?) = ? AND uid_owner = ? AND uid_shared_with ".self::getUsersAndGroups($uid_shared_with));
$query->execute(array($permissions, strlen($source), $source, OC_User::getUser()));
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}
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/**
* Unshare the item, removes it from all specified users
*
* You must use the pullOutOfFolder() function to unshare a file inside a shared folder and set $newTarget to nothing
*
* @param $source The source location of the item
* @param $uid_shared_with Array of users to unshare the item from
*/
public static function unshare($source, $uid_shared_with) {
$source = self::cleanPath($source);
$query = OC_DB::prepare("DELETE FROM *PREFIX*sharing WHERE SUBSTR(source, 1, ?) = ? AND uid_owner = ? AND uid_shared_with ".self::getUsersAndGroups($uid_shared_with));
$query->execute(array(strlen($source), $source, OC_User::getUser()));
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}
/**
* Unshare the item from the current user, removes it only from the database and doesn't touch the source file
*
* You must use the pullOutOfFolder() function before you call unshareFromMySelf() and set the delete parameter to false to unshare from self a file inside a shared folder
*
* @param $target The target location of the item
* @param $delete (Optional) If true delete the entry from the database, if false the permission is set to UNSHARED
*/
public static function unshareFromMySelf($target, $delete = true) {
$target = self::cleanPath($target);
if ($delete) {
$query = OC_DB::prepare("DELETE FROM *PREFIX*sharing WHERE SUBSTR(target, 1, ?) = ? AND uid_shared_with ".self::getUsersAndGroups());
$query->execute(array(strlen($target), $target));
} else {
$query = OC_DB::prepare("UPDATE *PREFIX*sharing SET permissions = ? WHERE SUBSTR(target, 1, ?) = ? AND uid_shared_with ".self::getUsersAndGroups());
$query->execute(array(self::UNSHARED, strlen($target), $target));
}
}
/**
* Remove the item from the database, the owner deleted the file
* @param $arguments Array of arguments passed from OC_Hook
*/
public static function deleteItem($arguments) {
$source = "/".OC_User::getUser()."/files".self::cleanPath($arguments['path']);
$query = OC_DB::prepare("DELETE FROM *PREFIX*sharing WHERE SUBSTR(source, 1, ?) = ? AND uid_owner = ?");
$query->execute(array(strlen($source), $source, OC_User::getUser()));
}
/**
* Rename the item in the database, the owner renamed the file
* @param $arguments Array of arguments passed from OC_Hook
*/
public static function renameItem($arguments) {
$oldSource = "/".OC_User::getUser()."/files".self::cleanPath($arguments['oldpath']);
$newSource = "/".OC_User::getUser()."/files".self::cleanPath($arguments['newpath']);
$query = OC_DB::prepare("UPDATE *PREFIX*sharing SET source = REPLACE(source, ?, ?) WHERE uid_owner = ?");
$query->execute(array($oldSource, $newSource, OC_User::getUser()));
}
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}
?>