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<?php
/**
* ical_export.php - provides functions to handle the export of events
* over a short url
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* @author Peter Thienel, data-quest GmbH <thienel@data-quest.de>
* @license http://www.gnu.org/licenses/gpl-2.0.html GPL version 2
* @category Stud.IP
*/
class IcalExport
{
private static $id_length = 8;
/**
* Sets the lentgh of the key
*
* @param int $length
*/
public static function setKeyLength($length)
{
self::$id_length = $length;
}
/**
* Returns a key string.
*
* @return string
*/
public static function makeKey()
{
$length = self::$id_length;
$ret = '';
$rejected = [
'A' => 2,
'E' => 2,
'I' => 2,
'O' => 2,
'U' => 2,
'a' => 2,
'e' => 2,
'i' => 2,
'o' => 2,
'u' => 2];
while ($length--) {
while (1) {
$rnd = rand(48, 122);
if ($rnd < 48)
continue;
if ($rnd > 57 && $rnd < 65)
continue;
if ($rnd > 90 && $rnd < 97)
continue;
if ($rnd > 122)
continue;
$char = chr($rnd);
if ($rejected[$char] > 1) {
continue;
}
$rejected[$char]++;
$ret .= $char;
break;
}
}
return $ret;
}
/**
* Returns the key by given user_id. Returns false if no valid key was found.
*
* @param string $user_id
* @return mixed
*/
public static function getKeyByUser($user_id)
{
return UserConfig::get($user_id)->getValue('ICAL_EXPORT_KEY');
}
/**
* Returns user_id by given key. Returns false if no valid user_id was found.
*
* @param type $short_id
* @return mixed
*/
public static function getUserIdByKey($key)
{
$where = "field = 'ICAL_EXPORT_KEY' AND value = " . DBManager::get()->quote($key);
$user_config_entries = ConfigValue::findBySql($where);
if (isset($user_config_entries[0])) {
return $user_config_entries[0]->getValue('range_id');
} else {
return false;
}
}
/**
* Sets a new key for the user with the given user_id.
*
* @param type $user_id
* @return string the new key
*/
public static function setKey($user_id)
{
// delete old key
$key = self::getKeyByUser($user_id);
if ($key) {
self::deleteKey($user_id);
}
// make new unique key
do {
$key = self::makeKey();
} while (self::getUserIdByKey($key));
UserConfig::get($user_id)->store('ICAL_EXPORT_KEY', $key);
return $key;
}
/**
* Deletes the key for the user with the given user_id.
*
* @param type $user_id
*/
public static function deleteKey($user_id)
{
UserConfig::get($user_id)->delete('ICAL_EXPORT_KEY');
}
}
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