app/code/core/Mage/Adminhtml/controllers/Catalog/Product/GalleryController.php

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<?php
/**
 * Magento
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@magentocommerce.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Magento to newer
 * versions in the future. If you wish to customize Magento for your
 * needs please refer to http://www.magentocommerce.com for more information.
 *
 * @category   Mage
 * @package    Mage_Adminhtml
 * @copyright  Copyright (c) 2008 Irubin Consulting Inc. DBA Varien (http://www.varien.com)
 * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */

/**
 * Catalog product gallery controller
 *
 * @category   Mage
 * @package    Mage_Adminhtml
 * @author      Magento Core Team <core@magentocommerce.com>
 */
class Mage_Adminhtml_Catalog_Product_GalleryController extends Mage_Adminhtml_Controller_Action
{
    public function uploadAction()
    {
        $result = array();
        try {
            $uploader = new Varien_File_Uploader('image');
            $uploader->setAllowedExtensions(array('jpg','jpeg','gif','png'));
            $uploader->setAllowRenameFiles(true);
            $uploader->setFilesDispersion(true);
            $result = $uploader->save(
                Mage::getSingleton('catalog/product_media_config')->getBaseTmpMediaPath()
            );

            $result['url'] = Mage::getSingleton('catalog/product_media_config')->getTmpMediaUrl($result['file']);
            $result['file'] = $result['file'] . '.tmp';
            $result['cookie'] = array(
                'name'     => session_name(),
                'value'    => $this->_getSession()->getSessionId(),
                'lifetime' => $this->_getSession()->getCookieLifetime(),
                'path'     => $this->_getSession()->getCookiePath(),
                'domain'   => $this->_getSession()->getCookieDomain()
            );
        } catch (Exception $e) {
            $result = array('error'=>$e->getMessage(), 'errorcode'=>$e->getCode());
        }

        $this->getResponse()->setBody(Zend_Json::encode($result));
    }

    protected function _isAllowed()
    {
        return Mage::getSingleton('admin/session')->isAllowed('catalog/products');
    }
} // Class Mage_Adminhtml_Catalog_Product_GalleryController End

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