api.php

<?php

/**
 * @copyright  For copyright and license information, read the COPYING.txt file.
 * @link       /COPYING.txt
 * @license    Open Software License (OSL 3.0)
 * @package    Mage
 */

$magentoRootDir = getcwd();
$bootstrapFilename = $magentoRootDir . '/app/bootstrap.php';
$mageFilename = $magentoRootDir . '/app/Mage.php';

if (!file_exists($bootstrapFilename)) {
    echo 'Bootstrap file not found';
    exit;
}

if (!file_exists($mageFilename)) {
    echo 'Mage file not found';
    exit;
}

require $bootstrapFilename;
require $mageFilename;

if (!Mage::isInstalled()) {
    echo 'Application is not installed yet, please complete install wizard first.';
    exit;
}

Mage::$headersSentThrowsException = false;
Mage::init('admin');
Mage::app()->loadAreaPart(Mage_Core_Model_App_Area::AREA_GLOBAL, Mage_Core_Model_App_Area::PART_EVENTS);
Mage::app()->loadAreaPart(Mage_Core_Model_App_Area::AREA_ADMINHTML, Mage_Core_Model_App_Area::PART_EVENTS);

// query parameter "type" is set by .htaccess rewrite rule
$apiAlias = Mage::app()->getRequest()->getParam('type');

// check request could be processed by API2
if (in_array($apiAlias, Mage_Api2_Model_Server::getApiTypes())) {
    // emulate index.php entry point for correct URLs generation in API
    Mage::register('custom_entry_point', true);
    /** @var Mage_Api2_Model_Server $server */
    $server = Mage::getSingleton('api2/server');

    $server->run();
} else {
    /** @var Mage_Api_Model_Server $server */
    $server = Mage::getSingleton('api/server');
    $adapterCode = $apiAlias ? $server->getAdapterCodeByAlias($apiAlias) : 'default';

    // if no adapters found in aliases - find it by default, by code
    if (null === $adapterCode) {
        $adapterCode = $apiAlias;
    }

    try {
        $server->initialize($adapterCode);
        // emulate index.php entry point for correct URLs generation in API
        Mage::register('custom_entry_point', true);
        $server->run();

        Mage::app()->getResponse()->sendResponse();
    } catch (Exception $exception) {
        Mage::logException($exception);

        echo $exception->getMessage();
        exit;
    }
}