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<?php
/**
* ownCloud
*
* @author Frank Karlitschek
* @copyright 2010 Frank Karlitschek karlitschek@kde.org
*
* 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/>.
*
*/
/*
*
* The following SQL statement is just a help for developers and will not be
* executed!
*
* CREATE TABLE `groups` (
* `gid` varchar(64) COLLATE utf8_unicode_ci NOT NULL,
* PRIMARY KEY (`gid`)
* ) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
*
* CREATE TABLE `group_user` (
* `gid` varchar(64) COLLATE utf8_unicode_ci NOT NULL,
* `uid` varchar(64) COLLATE utf8_unicode_ci NOT NULL
* ) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
*
*/
/**
* Class for group management in a SQL Database (e.g. MySQL, SQLite)
*/
class OC_Group_Database extends OC_Group_Backend {
static private $userGroupCache=array();
/**
* @brief Try to create a new group
* @param $gid The name of the group to create
* @returns true/false
*
* Trys to create a new group. If the group name already exists, false will
* be returned.
*/
public static function createGroup( $gid ){
// Check for existence
$query = OC_DB::prepare( "SELECT gid FROM `*PREFIX*groups` WHERE gid = ?" );
$result = $query->execute( array( $gid ));
if( $result->fetchRow() ){
// Can not add an existing group
return false;
}
else{
// Add group and exit
$query = OC_DB::prepare( "INSERT INTO `*PREFIX*groups` ( `gid` ) VALUES( ? )" );
$result = $query->execute( array( $gid ));
return $result ? true : false;
}
}
/**
* @brief delete a group
* @param $gid gid of the group to delete
* @returns true/false
*
* Deletes a group and removes it from the group_user-table
*/
public static function deleteGroup( $gid ){
// Delete the group
$query = OC_DB::prepare( "DELETE FROM `*PREFIX*groups` WHERE gid = ?" );
$result = $query->execute( array( $gid ));
// Delete the group-user relation
$query = OC_DB::prepare( "DELETE FROM `*PREFIX*group_user` WHERE gid = ?" );
$result = $query->execute( array( $gid ));
return true;
}
/**
* @brief is user in group?
* @param $uid uid of the user
* @param $gid gid of the group
* @returns true/false
*
* Checks whether the user is member of a group or not.
*/
public static function inGroup( $uid, $gid ){
// check
$query = OC_DB::prepare( "SELECT uid FROM `*PREFIX*group_user` WHERE gid = ? AND uid = ?" );
$result = $query->execute( array( $gid, $uid ));
return $result->fetchRow() ? true : false;
}
/**
* @brief Add a user to a group
* @param $uid Name of the user to add to group
* @param $gid Name of the group in which add the user
* @returns true/false
*
* Adds a user to a group.
*/
public static function addToGroup( $uid, $gid ){
// No duplicate entries!
if( !self::inGroup( $uid, $gid )){
$query = OC_DB::prepare( "INSERT INTO `*PREFIX*group_user` ( `uid`, `gid` ) VALUES( ?, ? )" );
$result = $query->execute( array( $uid, $gid ));
return true;
}else{
return false;
}
}
/**
* @brief Removes a user from a group
* @param $uid Name of the user to remove from group
* @param $gid Name of the group from which remove the user
* @returns true/false
*
* removes the user from a group.
*/
public static function removeFromGroup( $uid, $gid ){
$query = OC_DB::prepare( "DELETE FROM *PREFIX*group_user WHERE uid = ? AND gid = ?" );
$result = $query->execute( array( $uid, $gid ));
return true;
}
/**
* @brief Get all groups a user belongs to
* @param $uid Name of the user
* @returns array with group names
*
* This function fetches all groups a user belongs to. It does not check
* if the user exists at all.
*/
public static function getUserGroups( $uid ){
// No magic!
$query = OC_DB::prepare( "SELECT gid FROM `*PREFIX*group_user` WHERE uid = ?" );
$result = $query->execute( array( $uid ));
$groups = array();
while( $row = $result->fetchRow()){
$groups[] = $row["gid"];
}
return $groups;
}
/**
* @brief get a list of all groups
* @returns array with group names
*
* Returns a list with all groups
*/
public static function getGroups(){
$query = OC_DB::prepare( "SELECT gid FROM `*PREFIX*groups`" );
$result = $query->execute();
$groups = array();
while( $row = $result->fetchRow()){
$groups[] = $row["gid"];
}
return $groups;
}
/**
* @brief get a list of all users in a group
* @returns array with user ids
*/
public static function usersInGroup($gid){
$query=OC_DB::prepare('SELECT uid FROM *PREFIX*group_user WHERE gid=?');
$users=array();
$result=$query->execute(array($gid));
while($row=$result->fetchRow()){
$users[]=$row['uid'];
}
return $users;
}
}
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