/app/code/core/Mage/Catalog/Model/Product/Api.php

<?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) 2011 Magento Inc. (http://www.magentocommerce.com)
 * @license     http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */

/**
 * Catalog product api
 *
 * @category   Mage
 * @package    Mage_Catalog
 * @author     Magento Core Team <core@magentocommerce.com>
 */
class Mage_Catalog_Model_Product_Api extends Mage_Catalog_Model_Api_Resource
{
    protected $_filtersMap = array(
        'product_id' => 'entity_id',
        'set'        => 'attribute_set_id',
        'type'       => 'type_id'
    );

    public function __construct()
    {
        $this->_storeIdSessionField = 'product_store_id';
        $this->_ignoredAttributeTypes[] = 'gallery';
        $this->_ignoredAttributeTypes[] = 'media_image';
    }

    /**
     * Retrieve list of products with basic info (id, sku, type, set, name)
     *
     * @param array $filters
     * @param string|int $store
     * @return array
     */
    public function items($filters = null, $store = null)
    {
        $collection = Mage::getModel('catalog/product')->getCollection()
            ->addStoreFilter($this->_getStoreId($store))
            ->addAttributeToSelect('name');

        if (is_array($filters)) {
            try {
                foreach ($filters as $field => $value) {
                    if (isset($this->_filtersMap[$field])) {
                        $field = $this->_filtersMap[$field];
                    }

                    $collection->addFieldToFilter($field, $value);
                }
            } catch (Mage_Core_Exception $e) {
                $this->_fault('filters_invalid', $e->getMessage());
            }
        }

        $result = array();

        foreach ($collection as $product) {
//            $result[] = $product->getData();
            $result[] = array( // Basic product data
                'product_id' => $product->getId(),
                'sku'        => $product->getSku(),
                'name'       => $product->getName(),
                'set'        => $product->getAttributeSetId(),
                'type'       => $product->getTypeId(),
                'category_ids'       => $product->getCategoryIds()
            );
        }

        return $result;
    }

    /**
     * Retrieve product info
     *
     * @param int|string $productId
     * @param string|int $store
     * @param array $attributes
     * @return array
     */
    public function info($productId, $store = null, $attributes = null, $identifierType = null)
    {
        $product = $this->_getProduct($productId, $store, $identifierType);

        if (!$product->getId()) {
            $this->_fault('not_exists');
        }

        $result = array( // Basic product data
            'product_id' => $product->getId(),
            'sku'        => $product->getSku(),
            'set'        => $product->getAttributeSetId(),
            'type'       => $product->getTypeId(),
            'categories' => $product->getCategoryIds(),
            'websites'   => $product->getWebsiteIds()
        );

        foreach ($product->getTypeInstance(true)->getEditableAttributes($product) as $attribute) {
            if ($this->_isAllowedAttribute($attribute, $attributes)) {
                $result[$attribute->getAttributeCode()] = $product->getData(
                                                                $attribute->getAttributeCode());
            }
        }

        return $result;
    }

    /**
     * Create new product.
     *
     * @param string $type
     * @param int $set
     * @param string $sku
     * @param array $productData
     * @param string $store
     * @return int
     */
    public function create($type, $set, $sku, $productData, $store = null)
    {
        if (!$type || !$set || !$sku) {
            $this->_fault('data_invalid');
        }

        /** @var $product Mage_Catalog_Model_Product */
        $product = Mage::getModel('catalog/product');
        $product->setStoreId($this->_getStoreId($store))
            ->setAttributeSetId($set)
            ->setTypeId($type)
            ->setSku($sku);

        if (isset($productData['website_ids']) && is_array($productData['website_ids'])) {
            $product->setWebsiteIds($productData['website_ids']);
        }

        foreach ($product->getTypeInstance(true)->getEditableAttributes($product) as $attribute) {
            if ($this->_isAllowedAttribute($attribute)
                && isset($productData[$attribute->getAttributeCode()])) {
                $product->setData(
                    $attribute->getAttributeCode(),
                    $productData[$attribute->getAttributeCode()]
                );
            }
        }

        $this->_prepareDataForSave($product, $productData);

        try {
            /**
             * @todo implement full validation process with errors returning which are ignoring now
             * @todo see Mage_Catalog_Model_Product::validate()
             */
            if (is_array($errors = $product->validate())) {
                $strErrors = array();
                foreach($errors as $code=>$error) {
                    $strErrors[] = ($error === true)? Mage::helper('catalog')->__('Attribute "%s" is invalid.', $code) : $error;
                }
                $this->_fault('data_invalid', implode("\n", $strErrors));
            }

            $product->save();
        } catch (Mage_Core_Exception $e) {
            $this->_fault('data_invalid', $e->getMessage());
        }

        return $product->getId();
    }

    /**
     * Update product data
     *
     * @param int|string $productId
     * @param array $productData
     * @param string|int $store
     * @return boolean
     */
    public function update($productId, $productData, $store = null, $identifierType = null)
    {
        $product = $this->_getProduct($productId, $store, $identifierType);

        if (!$product->getId()) {
            $this->_fault('not_exists');
        }

        if (isset($productData['website_ids']) && is_array($productData['website_ids'])) {
            $product->setWebsiteIds($productData['website_ids']);
        }

        foreach ($product->getTypeInstance(true)->getEditableAttributes($product) as $attribute) {
            if ($this->_isAllowedAttribute($attribute)
                && isset($productData[$attribute->getAttributeCode()])) {
                $product->setData(
                    $attribute->getAttributeCode(),
                    $productData[$attribute->getAttributeCode()]
                );
            }
        }

        $this->_prepareDataForSave($product, $productData);


        try {
            /**
             * @todo implement full validation process with errors returning which are ignoring now
             * @todo see Mage_Catalog_Model_Product::validate()
             */
            if (is_array($errors = $product->validate())) {
                $strErrors = array();
                foreach($errors as $code=>$error) {
                    $strErrors[] = ($error === true)? Mage::helper('catalog')->__('Value for "%s" is invalid.', $code) : Mage::helper('catalog')->__('Value for "%s" is invalid: %s', $code, $error);
                }
                $this->_fault('data_invalid', implode("\n", $strErrors));
            }

            $product->save();
        } catch (Mage_Core_Exception $e) {
            $this->_fault('data_invalid', $e->getMessage());
        }

        return true;
    }

    /**
     *  Set additional data before product saved
     *
     *  @param    Mage_Catalog_Model_Product $product
     *  @param    array $productData
     *  @return	  object
     */
    protected function _prepareDataForSave ($product, $productData)
    {
        if (isset($productData['categories']) && is_array($productData['categories'])) {
            $product->setCategoryIds($productData['categories']);
        }

        if (isset($productData['websites']) && is_array($productData['websites'])) {
            foreach ($productData['websites'] as &$website) {
                if (is_string($website)) {
                    try {
                        $website = Mage::app()->getWebsite($website)->getId();
                    } catch (Exception $e) { }
                }
            }
            $product->setWebsiteIds($productData['websites']);
        }

        if (Mage::app()->isSingleStoreMode()) {
            $product->setWebsiteIds(array(Mage::app()->getStore(true)->getWebsite()->getId()));
        }

        if (isset($productData['stock_data']) && is_array($productData['stock_data'])) {
            $product->setStockData($productData['stock_data']);
        } else {
            $product->setStockData(array('use_config_manage_stock' => 0));
        }

        if (isset($productData['tier_price']) && is_array($productData['tier_price'])) {
             $tierPrices = Mage::getModel('catalog/product_attribute_tierprice_api')->prepareTierPrices($product, $productData['tier_price']);
             $product->setData(Mage_Catalog_Model_Product_Attribute_Tierprice_Api::ATTRIBUTE_CODE, $tierPrices);
        }
    }

    /**
     * Update product special price
     *
     * @param int|string $productId
     * @param float $specialPrice
     * @param string $fromDate
     * @param string $toDate
     * @param string|int $store
     * @return boolean
     */
    public function setSpecialPrice($productId, $specialPrice = null, $fromDate = null, $toDate = null, $store = null)
    {
        return $this->update($productId, array(
            'special_price'     => $specialPrice,
            'special_from_date' => $fromDate,
            'special_to_date'   => $toDate
        ), $store);
    }

    /**
     * Retrieve product special price
     *
     * @param int|string $productId
     * @param string|int $store
     * @return array
     */
    public function getSpecialPrice($productId, $store = null)
    {
        return $this->info($productId, $store, array('special_price', 'special_from_date', 'special_to_date'));
    }

    /**
     * Delete product
     *
     * @param int|string $productId
     * @return boolean
     */
    public function delete($productId, $identifierType = null)
    {
        $product = $this->_getProduct($productId, null, $identifierType);

        if (!$product->getId()) {
            $this->_fault('not_exists');
        }

        try {
            $product->delete();
        } catch (Mage_Core_Exception $e) {
            $this->_fault('not_deleted', $e->getMessage());
        }

        return true;
    }
} // Class Mage_Catalog_Model_Product_Api End