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103 lines
3.2 KiB
PHP
103 lines
3.2 KiB
PHP
<?php
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// Copyright (C) 2010-2012 Combodo SARL
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//
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// This file is part of iTop.
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//
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// iTop is free software; you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// iTop 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 License
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// along with iTop. If not, see <http://www.gnu.org/licenses/>
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/**
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* This class records the pending "transactions" corresponding to forms that have not been
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* submitted yet, in order to prevent double submissions. When created a transaction remains valid
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* until the user's session expires
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*
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* @package iTop
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* @copyright Copyright (C) 2010-2012 Combodo SARL
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* @license http://opensource.org/licenses/AGPL-3.0
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*/
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class privUITransaction
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{
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/**
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* Create a new transaction id, store it in the session and return its id
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* @param void
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* @return int The identifier of the new transaction
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*/
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public static function GetNewTransactionId()
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{
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if (!isset($_SESSION['transactions']))
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{
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$_SESSION['transactions'] = array();
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}
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// Strictly speaking, the two lines below should be grouped together
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// by a critical section
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// sem_acquire($rSemIdentified);
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$id = str_replace(array('.', ' '), '', microtime()); //1 + count($_SESSION['transactions']);
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$_SESSION['transactions'][$id] = true;
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// sem_release($rSemIdentified);
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return (string)$id;
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}
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/**
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* Check whether a transaction is valid or not and (optionally) remove the valid transaction from
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* the session so that another call to IsTransactionValid for the same transaction id
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* will return false
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* @param int $id Identifier of the transaction, as returned by GetNewTransactionId
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* @param bool $bRemoveTransaction True if the transaction must be removed
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* @return bool True if the transaction is valid, false otherwise
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*/
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public static function IsTransactionValid($id, $bRemoveTransaction = true)
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{
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$bResult = false;
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if (isset($_SESSION['transactions']))
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{
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// Strictly speaking, the eight lines below should be grouped together
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// inside the same critical section as above
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// sem_acquire($rSemIdentified);
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if (isset($_SESSION['transactions'][$id]))
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{
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$bResult = true;
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if ($bRemoveTransaction)
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{
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unset($_SESSION['transactions'][$id]);
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}
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}
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// sem_release($rSemIdentified);
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}
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return $bResult;
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}
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/**
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* Removes the transaction specified by its id
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* @param int $id The Identifier (as returned by GetNewTranscationId) of the transaction to be removed.
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* @return void
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*/
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public static function RemoveTransaction($id)
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{
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if (isset($_SESSION['transactions']))
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{
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// Strictly speaking, the three lines below should be grouped together
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// inside the same critical section as above
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// sem_acquire($rSemIdentified);
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if (isset($_SESSION['transactions'][$id]))
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{
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unset($_SESSION['transactions'][$id]);
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}
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// sem_release($rSemIdentified);
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}
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}
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}
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?>
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