<?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   Varien
 * @package    Varien_Http
 * @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)
 */

/**
 * HTTP CURL Adapter
 *
 * @category    Varien
 * @package     Varien_Http
 * @author      Magento Core Team <core@magentocommerce.com>
 */
class Varien_Http_Adapter_Curl implements Zend_Http_Client_Adapter_Interface
{
    /**
     * Parameters array
     *
     * @var array
     */
    protected $_config = array();

    /**
     * Curl handle
     *
     * @var resource
     */
    protected $_resource;

    /**
     * Allow parameters
     *
     * @var array
     */
    protected $_allowedParams = array(
        'timeout' => CURLOPT_TIMEOUT,
        'maxredirects' => CURLOPT_MAXREDIRS,
        'proxy' => CURLOPT_PROXY,
        'ssl_cert' => CURLOPT_SSLCERT,
        'userpwd' => CURLOPT_USERPWD
    );

    /**
     * Array of CURL options
     *
     * @var array
     */
    protected $_options = array();

    /**
     * Apply current configuration array to transport resource
     *
     * @return Varien_Http_Adapter_Curl
     */
    protected function _applyConfig()
    {
        if (empty($this->_config)) {
            return $this;
        }

        // apply additional options to cURL
        foreach ($this->_options as $option => $value) {
            curl_setopt($this->_getResource(), $option, $value);
        }

        $verifyPeer = isset($this->_config['verifypeer']) ? $this->_config['verifypeer'] : 0;
        curl_setopt($this->_getResource(), CURLOPT_SSL_VERIFYPEER, $verifyPeer);

        $verifyHost = isset($this->_config['verifyhost']) ? $this->_config['verifyhost'] : 0;
        curl_setopt($this->_getResource(), CURLOPT_SSL_VERIFYHOST, $verifyHost);

        foreach ($this->_config as $param => $curlOption) {
            if (array_key_exists($param, $this->_allowedParams)) {
                curl_setopt($this->_getResource(), $this->_allowedParams[$param], $this->_config[$param]);
            }
        }
        return $this;
    }

    /**
     * Set array of additional cURL options
     *
     * @param array $options
     * @return Varien_Http_Adapter_Curl
     */
    public function setOptions(array $options = array())
    {
        $this->_options = $options;
        return $this;
    }

    /**
     * Add additional option to cURL
     *
     * @param  int $option      the CURLOPT_* constants
     * @param  mixed $value
     * @return Varien_Http_Adapter_Curl
     */
    public function addOption($option, $value)
    {
        $this->_options[$option] = $value;
        return $this;
    }

    /**
     * Set the configuration array for the adapter
     *
     * @param array $config
     * @return Varien_Http_Adapter_Curl
     */
    public function setConfig($config = array())
    {
        $this->_config = $config;
        return $this;
    }

    /**
     * Connect to the remote server
     *
     * @deprecated since 1.4.0.0-rc1
     * @param string  $host
     * @param int     $port
     * @param boolean $secure
     * @return Varien_Http_Adapter_Curl
     */
    public function connect($host, $port = 80, $secure = false)
    {
        return $this->_applyConfig();
    }

    /**
     * Send request to the remote server
     *
     * @param string        $method
     * @param Zend_Uri_Http $url
     * @param string        $http_ver
     * @param array         $headers
     * @param string        $body
     * @return string Request as text
     */
    public function write($method, $url, $http_ver = '1.1', $headers = array(), $body = '')
    {
        if ($url instanceof Zend_Uri_Http) {
            $url = $url->getUri();
        }
        $this->_applyConfig();

        // set url to post to
        curl_setopt($this->_getResource(), CURLOPT_URL, $url);
        curl_setopt($this->_getResource(), CURLOPT_RETURNTRANSFER, true);
        if ($method == Zend_Http_Client::POST) {
            curl_setopt($this->_getResource(), CURLOPT_POST, true);
            curl_setopt($this->_getResource(), CURLOPT_POSTFIELDS, $body);
        }
        elseif ($method == Zend_Http_Client::GET) {
            curl_setopt($this->_getResource(), CURLOPT_HTTPGET, true);
        }

        if (is_array($headers)) {
            curl_setopt($this->_getResource(), CURLOPT_HTTPHEADER, $headers);
        }

        /**
         * @internal Curl options setter have to be re-factored
         */
        $header = isset($this->_config['header']) ? $this->_config['header'] : true;
        curl_setopt($this->_getResource(), CURLOPT_HEADER, $header);

        return $body;
    }

    /**
     * Read response from server
     *
     * @return string
     */
    public function read()
    {
        $response = curl_exec($this->_getResource());

        // Remove 100 and 101 responses headers
        while (Zend_Http_Response::extractCode($response) == 100 || Zend_Http_Response::extractCode($response) == 101) {
            $response = preg_split('/^\r?$/m', $response, 2);
            $response = trim($response[1]);
        }

        if (stripos($response, "Transfer-Encoding: chunked\r\n")) {
            $response = str_ireplace("Transfer-Encoding: chunked\r\n", '', $response);
        }

        return $response;
    }

    /**
     * Close the connection to the server
     *
     * @return Varien_Http_Adapter_Curl
     */
    public function close()
    {
        curl_close($this->_getResource());
        $this->_resource = null;
        return $this;
    }

    /**
     * Returns a cURL handle on success
     *
     * @return resource
     */
    protected function _getResource()
    {
        if (is_null($this->_resource)) {
            $this->_resource = curl_init();
        }
        return $this->_resource;
    }

    /**
     * Get last error number
     *
     * @return int
     */
    public function getErrno()
    {
        return curl_errno($this->_getResource());
    }

    /**
     * Get string with last error for the current session
     *
     * @return string
     */
    public function getError()
    {
        return curl_error($this->_getResource());
    }

    /**
     * Get information regarding a specific transfer
     *
     * @param int $opt CURLINFO option
     * @return mixed
     */
    public function getInfo($opt = 0)
    {
        return curl_getinfo($this->_getResource(), $opt);
    }

    /**
     * curl_multi_* requests support
     *
     * @param array $urls
     * @param array $options
     * @return array
     */
    public function multiRequest($urls, $options = array())
    {
        $handles = array();
        $result  = array();

        $multihandle = curl_multi_init();

        foreach ($urls as $key => $url) {
            $handles[$key] = curl_init();
            curl_setopt($handles[$key], CURLOPT_URL,            $url);
            curl_setopt($handles[$key], CURLOPT_HEADER,         0);
            curl_setopt($handles[$key], CURLOPT_RETURNTRANSFER, 1);
            if (!empty($options)) {
                curl_setopt_array($handles[$key], $options);
            }
            curl_multi_add_handle($multihandle, $handles[$key]);
        }
        $process = null;
        do {
            curl_multi_exec($multihandle, $process);
            usleep(100);
        } while ($process>0);

        foreach ($handles as $key => $handle) {
            $result[$key] = curl_multi_getcontent($handle);
            curl_multi_remove_handle($multihandle, $handle);
        }
        curl_multi_close($multihandle);
        return $result;
    }
}