app/code/core/Mage/Cms/Helper/Page.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_Cms
 * @copyright  Copyright (c) 2009 Irubin Consulting Inc. DBA Varien (http://www.varien.com)
 * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */


/**
 * CMS Page Helper
 *
 * @category   Mage
 * @package    Mage_Cms
 * @author     Magento Core Team <core@magentocommerce.com>
 */
class Mage_Cms_Helper_Page extends Mage_Core_Helper_Abstract
{
    const XML_PATH_NO_ROUTE_PAGE        = 'web/default/cms_no_route';
    const XML_PATH_NO_COOKIES_PAGE      = 'web/default/cms_no_cookies';
    const XML_PATH_HOME_PAGE            = 'web/default/cms_home_page';

    /**
    * Renders CMS page
    *
    * Call from controller action
    *
    * @param Mage_Core_Controller_Front_Action $action
    * @param integer $pageId
    * @return boolean
    */
    public function renderPage(Mage_Core_Controller_Front_Action $action, $pageId = null)
    {
        $page = Mage::getSingleton('cms/page');
        if (!is_null($pageId) && $pageId!==$page->getId()) {
            $page->setStoreId(Mage::app()->getStore()->getId());
            if (!$page->load($pageId)) {
                return false;
            }
        }

        if (!$page->getId()) {
            return false;
        }

        if ($page->getCustomTheme()) {
            if (Mage::app()->getLocale()->IsStoreDateInInterval(null, $page->getCustomThemeFrom(), $page->getCustomThemeTo())) {
                list($package, $theme) = explode('/', $page->getCustomTheme());
                Mage::getSingleton('core/design_package')
                    ->setPackageName($package)
                    ->setTheme($theme);
            }
        }

        $action->getLayout()->getUpdate()
            ->addHandle('default')
            ->addHandle('cms_page');

        $action->addActionLayoutHandles();
        if ($page->getRootTemplate()) {
            $action->getLayout()->helper('page/layout')
                ->applyHandle($page->getRootTemplate());
        }

        $action->loadLayoutUpdates();
        $action->getLayout()->getUpdate()->addUpdate($page->getLayoutUpdateXml());
        $action->generateLayoutXml()->generateLayoutBlocks();

        if ($page->getRootTemplate()) {
            $action->getLayout()->helper('page/layout')
                ->applyTemplate($page->getRootTemplate());
        }

        if ($storage = Mage::getSingleton('catalog/session')) {
            $action->getLayout()->getMessagesBlock()->addMessages($storage->getMessages(true));
        }

        if ($storage = Mage::getSingleton('checkout/session')) {
            $action->getLayout()->getMessagesBlock()->addMessages($storage->getMessages(true));
        }

        $action->renderLayout();

        return true;
    }

    /**
     * Retrieve page direct URL
     *
     * @param string $pageId
     * @return string
     */
    public function getPageUrl($pageId = null)
    {
        $page = Mage::getSingleton('cms/page');
        if (!is_null($pageId) && $pageId !== $page->getId()) {
            $page->setStoreId(Mage::app()->getStore()->getId());
            if (!$page->load($pageId)) {
                return null;
            }
        }

        if (!$page->getId()) {
            return null;
        }

        return Mage::getUrl(null, array('_direct' => $page->getIdentifier()));
    }
}

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