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<?php
/**
* Copyright (c) 2012 Georg Ehrke <ownclouddev@georgswebsite.de>
* This file is licensed under the Affero General Public License version 3 or
* later.
* See the COPYING-README file.
*/
/*
* This class manages shared calendars
*/
class OC_Calendar_Share{
const CALENDAR = 'calendar';
const EVENT = 'event';
/*
* @brief: returns informations about all calendar or events which users are sharing with the user - userid
* @param: (string) $userid - id of the user
* @param: (string) $type - use const self::CALENDAR or self::EVENT
* @return: (array) $return - information about calendars
*/
public static function allSharedwithuser($userid, $type, $active=null, $permission=null){
$group_where = self::group_sql(OC_Group::getUserGroups($userid));
$permission_where = self::permission_sql($permission);
if($type == self::CALENDAR){
$active_where = self::active_sql($active);
}else{
$active_where = '';
}
$stmt = OC_DB::prepare('SELECT * FROM *PREFIX*calendar_share_' . $type . ' WHERE ((share = ? AND sharetype = "user") ' . $group_where . ') AND owner <> ? ' . $permission_where . ' ' . $active_where);
$result = $stmt->execute(array($userid, $userid));
$return = array();
while( $row = $result->fetchRow()){
$return[] = $row;
}
return $return;
}
/*
* @brief: returns all users a calendar / event is shared with
* @param: (int) id - id of the calendar / event
* @param: (string) $type - use const self::CALENDAR or self::EVENT
* @return: (array) $users - information about users a calendar / event is shared with
*/
public static function allUsersSharedwith($id, $type){
$stmt = OC_DB::prepare('SELECT * FROM *PREFIX*calendar_share_' . $type . ' WHERE ' . $type . 'id = ? ORDER BY share');
$result = $stmt->execute(array($id));
$users = array();
while( $row = $result->fetchRow()){
$users[] = $row;
}
return $users;
}
/*
* @brief: shares a calendar / event
* @param: (string) $owner - userid of the owner
* @param: (string) $share - userid (if $sharetype == user) / groupid (if $sharetype == group) / token (if $sharetype == public)
* @param: (string) $sharetype - type of sharing (can be: user/group/public)
* @param: (string) $id - id of the calendar / event
* @param: (string) $type - use const self::CALENDAR or self::EVENT
* @return (mixed) - token (if $sharetype == public) / bool (if $sharetype != public)
*/
public static function share($owner, $share, $sharetype, $id, $type){
if(self::is_already_shared($owner, $share, $sharetype, $id, $type)){
return false;
}
switch($sharetype){
case 'user':
case 'group':
case 'public':
break;
default:
return false;
}
if($sharetype == 'public'){
$share = self::generate_token($id, $type);
}
$stmt = OC_DB::prepare('INSERT INTO *PREFIX*calendar_share_' . $type . ' (owner,share,sharetype,' . $type . 'id,permissions' . (($type == self::CALENDAR)?', active':'') . ') VALUES(?,?,?,?,0' . (($type == self::CALENDAR)?', 1':'') . ')' );
$result = $stmt->execute(array($owner,$share,$sharetype,$id));
if($sharetype == 'public'){
return $share;
}else{
return true;
}
}
/*
* @brief: stops sharing a calendar / event
* @param: (string) $owner - userid of the owner
* @param: (string) $share - userid (if $sharetype == user) / groupid (if $sharetype == group) / token (if $sharetype == public)
* @param: (string) $sharetype - type of sharing (can be: user/group/public)
* @param: (string) $id - id of the calendar / event
* @param: (string) $type - use const self::CALENDAR or self::EVENT
* @return (bool)
*/
public static function unshare($owner, $share, $sharetype, $id, $type){
$stmt = OC_DB::prepare('DELETE FROM *PREFIX*calendar_share_' . $type . ' WHERE owner = ? ' . (($sharetype != 'public')?'AND share = ?':'') . ' AND sharetype = ? AND ' . $type . 'id = ?');
if($sharetype != 'public'){
$stmt->execute(array($owner,$share,$sharetype,$id));
}else{
$stmt->execute(array($owner,$sharetype,$id));
}
return true;
}
/*
* @brief: changes the permission for a calendar / event
* @param: (string) $share - userid (if $sharetype == user) / groupid (if $sharetype == group) / token (if $sharetype == public)
* @param: (string) $sharetype - type of sharing (can be: user/group/public)
* @param: (string) $id - id of the calendar / event
* @param: (int) $permission - permission of user the calendar / event is shared with (if $sharetype == public then $permission = 0)
* @param: (string) $type - use const self::CALENDAR or self::EVENT
* @return (bool)
*/
public static function changepermission($share, $sharetype, $id, $permission, $type){
if($sharetype == 'public' && $permission == 1){
$permission = 0;
}
$stmt = OC_DB::prepare('UPDATE *PREFIX*calendar_share_' . $type . ' SET permissions = ? WHERE share = ? AND sharetype = ? AND ' . $type . 'id = ?');
$stmt->execute(array($permission, $share, $sharetype, $id));
return true;
}
/*
* @brief: generates a token for public calendars / events
* @return: (string) $token
*/
private static function generate_token($id, $type){
$uniqid = uniqid();
if($type == self::CALENDAR){
$events = OC_Calendar_Object::all($id);
$string = '';
foreach($events as $event){
$string .= $event['calendardata'];
}
}else{
$string = OC_Calendar_Object::find($id);
}
$string = sha1($string['calendardata']);
$id = sha1($id);
$array = array($uniqid,$string,$id);
shuffle($array);
$string = implode('', $array);
$token = md5($string);
return substr($token, rand(0,16), 15);
}
/*
* @brief: checks if it is already shared
* @param: (string) $owner - userid of the owner
* @param: (string) $share - userid (if $sharetype == user) / groupid (if $sharetype == group) / token (if $sharetype == public)
* @param: (string) $sharetype - type of sharing (can be: user/group/public)
* @param: (string) $id - id of the calendar / event
* @param: (string) $type - use const self::CALENDAR or self::EVENT
* @return (bool)
*/
public static function is_already_shared($owner, $share, $sharetype, $id, $type){
$stmt = OC_DB::prepare('SELECT * FROM *PREFIX*calendar_share_' . $type . ' WHERE owner = ? AND share = ? AND sharetype = ? AND ' . $type . 'id = ?');
$result = $stmt->execute(array($owner, $share, $sharetype, $id));
if($result->numRows() > 0){
return true;
}
return false;
}
private static function group_sql($groups){
$group_where = '';
$i = 0;
foreach($groups as $group){
$group_where .= ' OR ';
$group_where .= ' (share = "' . $group . '" AND sharetype = "group") ';
$i++;
}
return $group_where;
}
private static function permission_sql($permission = null){
$permission_where = '';
if(!is_null($permission)){
$permission_where = ' AND permissions = ';
$permission_where .= ($permission=='rw')?'"1"':'"0"';
}
return $permission_where;
}
private static function active_sql($active = null){
$active_where = '';
if(!is_null($active)){
$active_where = 'AND active = ';
$active_where .= (!is_null($active) && $active)?'1':'0';
}
return $active_where;
}
/*
* @brief: checks the permission for editing an event
* @param: (string) $share - userid (if $sharetype == user) / groupid (if $sharetype == group) / token (if $sharetype == public)
* @param: (string) $id - id of the calendar / event
* @param: (string) $type - use const self::CALENDAR or self::EVENT
* @return (bool)
*/
public static function is_editing_allowed($share, $id, $type){
$group_where = self::group_sql(OC_Group::getUserGroups($share));
$permission_where = self::permission_sql('rw');
$stmt = OC_DB::prepare('SELECT * FROM *PREFIX*calendar_share_' . $type . ' WHERE ((share = ? AND sharetype = "user") ' . $group_where . ') ' . $permission_where);
$result = $stmt->execute(array($share));
if($result->numRows() == 1){
return true;
}
if($type == self::EVENT){
$event = OC_Calendar_App::getEventObject($id, false, false);
return self::is_editing_allowed($share, $event['calendarid'], self::CALENDAR);
}
return false;
}
/*
* @brief: checks the access of
* @param: (string) $share - userid (if $sharetype == user) / groupid (if $sharetype == group) / token (if $sharetype == public)
* @param: (string) $id - id of the calendar / event
* @param: (string) $type - use const self::CALENDAR or self::EVENT
* @return (bool)
*/
public static function check_access($share, $id, $type){
$group_where = self::group_sql(OC_Group::getUserGroups($share));
$stmt = OC_DB::prepare('SELECT * FROM *PREFIX*calendar_share_' . $type . ' WHERE (' . $type . 'id = ? AND (share = ? AND sharetype = "user") ' . $group_where . ')');
$result = $stmt->execute(array($id,$share));
$rows = $result->numRows();
if($rows > 0){
return true;
}elseif($type == self::EVENT){
$event = OC_Calendar_App::getEventObject($id, false, false);
return self::check_access($share, $event['calendarid'], self::CALENDAR);
}else{
return false;
}
}
/*
* @brief: returns the calendardata of an event or a calendar
* @param: (string) $token - token which should be searched
* @return: mixed - bool if false, array with type and id if true
*/
public static function getElementByToken($token){
$stmt_calendar = OC_DB::prepare('SELECT * FROM *PREFIX*calendar_share_' . OC_Calendar_Share::CALENDAR . ' WHERE sharetype = "public" AND share = ?');
$result_calendar = $stmt_calendar->execute(array($token));
$stmt_event = OC_DB::prepare('SELECT * FROM *PREFIX*calendar_share_' . OC_Calendar_Share::EVENT . ' WHERE sharetype = "public" AND share = ?');
$result_event = $stmt_event->execute(array($token));
$return = array();
if($result_calendar->numRows() == 0 && $result_event->numRows() == 0){
return false;
}elseif($result_calendar->numRows() != 0){
$return ['type'] = 'calendar';
$calendar = $result_calendar->fetchRow();
$return ['id'] = $calendar['calendarid'];
}else{
$return ['type'] = 'event';
$event = $result_event->fetchRow();
$return ['id'] = $event['eventid'];
}
return $return;
}
}
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