app/code/core/Mage/Catalog/controllers/ProductController.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_Catalog
 * @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)
 */

/**
 * Product controller
 *
 * @category   Mage
 * @package    Mage_Catalog
 */
class Mage_Catalog_ProductController extends Mage_Core_Controller_Front_Action
{
    /**
     * Initialize requested product object
     *
     * @return Mage_Catalog_Model_Product
     */
    protected function _initProduct()
    {
        Mage::dispatchEvent('catalog_controller_product_init_before', array('controller_action'=>$this));
        $categoryId = (int) $this->getRequest()->getParam('category', false);
        $productId  = (int) $this->getRequest()->getParam('id');

        if (!$productId) {
            return false;
        }

        $product = Mage::getModel('catalog/product')
            ->setStoreId(Mage::app()->getStore()->getId())
            ->load($productId);

        if (!Mage::helper('catalog/product')->canShow($product)) {
            return false;
        }
        if (!in_array(Mage::app()->getStore()->getWebsiteId(), $product->getWebsiteIds())) {
            return false;
        }

        $category = null;
        if ($categoryId) {
            $category = Mage::getModel('catalog/category')->load($categoryId);
            $product->setCategory($category);
            Mage::register('current_category', $category);
        }
        elseif ($categoryId = Mage::getSingleton('catalog/session')->getLastVisitedCategoryId()) {
            if ($product->canBeShowInCategory($categoryId)) {
                $category = Mage::getModel('catalog/category')->load($categoryId);
                $product->setCategory($category);
                Mage::register('current_category', $category);
            }
        }


        Mage::register('current_product', $product);
        Mage::register('product', $product);

        try {
            Mage::dispatchEvent('catalog_controller_product_init', array('product'=>$product));
            Mage::dispatchEvent('catalog_controller_product_init_after', array('product'=>$product, 'controller_action' => $this));
        } catch (Mage_Core_Exception $e) {
            Mage::logException($e);
            return false;
        }

        return $product;
    }

    /**
     * Initialize product view layout
     *
     * @param   Mage_Catalog_Model_Product $product
     * @return  Mage_Catalog_ProductController
     */
    protected function _initProductLayout($product)
    {
        $update = $this->getLayout()->getUpdate();
        $update->addHandle('default');
        $this->addActionLayoutHandles();

        $update->addHandle('PRODUCT_TYPE_'.$product->getTypeId());
        $update->addHandle('PRODUCT_'.$product->getId());

        if ($product->getPageLayout()) {
            $this->getLayout()->helper('page/layout')
                ->applyHandle($product->getPageLayout());
        }

        $this->loadLayoutUpdates();


        $update->addUpdate($product->getCustomLayoutUpdate());

        $this->generateLayoutXml()->generateLayoutBlocks();

        if ($product->getPageLayout()) {
            $this->getLayout()->helper('page/layout')
                ->applyTemplate($product->getPageLayout());
        }

        $currentCategory = Mage::registry('current_category');
        if ($root = $this->getLayout()->getBlock('root')) {
            $root->addBodyClass('product-'.$product->getUrlKey());
            if ($currentCategory instanceof Mage_Catalog_Model_Category) {
                $root->addBodyClass('categorypath-'.$currentCategory->getUrlPath())
                    ->addBodyClass('category-'.$currentCategory->getUrlKey());
            }
        }
        return $this;
    }

    /**
     * View product action
     */
    public function viewAction()
    {
        if ($product = $this->_initProduct()) {
            Mage::dispatchEvent('catalog_controller_product_view', array('product'=>$product));

            if ($this->getRequest()->getParam('options')) {
                $notice = $product->getTypeInstance(true)->getSpecifyOptionMessage();
                Mage::getSingleton('catalog/session')->addNotice($notice);
            }

            Mage::getSingleton('catalog/session')->setLastViewedProductId($product->getId());
            Mage::getModel('catalog/design')->applyDesign($product, Mage_Catalog_Model_Design::APPLY_FOR_PRODUCT);

            $this->_initProductLayout($product);
            $this->_initLayoutMessages('catalog/session');
            $this->_initLayoutMessages('tag/session');
            $this->_initLayoutMessages('checkout/session');
            $this->renderLayout();
        }
        else {
            if (isset($_GET['store'])  && !$this->getResponse()->isRedirect()) {
                $this->_redirect('');
            } elseif (!$this->getResponse()->isRedirect()) {
                $this->_forward('noRoute');
            }
        }
    }

    /**
     * View product gallery action
     */
    public function galleryAction()
    {
        if (!$this->_initProduct()) {
            if (isset($_GET['store']) && !$this->getResponse()->isRedirect()) {
                $this->_redirect('');
            } elseif (!$this->getResponse()->isRedirect()) {
                $this->_forward('noRoute');
            }
            return;
        }
        $this->loadLayout();
        $this->renderLayout();
    }

    /**
     * Display product image action
     */
    public function imageAction()
    {
        $size = (string) $this->getRequest()->getParam('size');
        if ($size) {
            $imageFile = preg_replace("#.*/catalog/product/image/size/[0-9]*x[0-9]*#", '', $this->getRequest()->getRequestUri());
        } else {
            $imageFile = preg_replace("#.*/catalog/product/image#", '', $this->getRequest()->getRequestUri());
        }

        if (!strstr($imageFile, '.')) {
            $this->_forward('noRoute');
            return;
        }

        try {
            $imageModel = Mage::getModel('catalog/product_image');
            $imageModel->setSize($size)
                ->setBaseFile($imageFile)
                ->resize()
                ->setWatermark( Mage::getStoreConfig('catalog/watermark/image') )
                ->saveFile()
                ->push();
        } catch( Exception $e ) {
            $this->_forward('noRoute');
        }
    }
}

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