/modules/paypal/api/paypal_connect.php

<?php
/**
* 2007-2015 PrestaShop
*
* NOTICE OF LICENSE
*
* This source file is subject to the Academic Free License (AFL 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/afl-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@prestashop.com so we can send you a copy immediately.
*
* DISCLAIMER
*
* Do not edit or add to this file if you wish to upgrade PrestaShop to newer
* versions in the future. If you wish to customize PrestaShop for your
* needs please refer to http://www.prestashop.com for more information.
*
*  @author    PrestaShop SA <contact@prestashop.com>
*  @copyright 2007-2015 PrestaShop SA
*  @license   http://opensource.org/licenses/afl-3.0.php  Academic Free License (AFL 3.0)
*  International Registered Trademark & Property of PrestaShop SA
*/

class PayPalConnect
{
	private	$_logs = array();
	private $paypal = null;
	
	public function __construct()
	{
		$this->paypal = new PayPal();
	}

	public function makeConnection($host, $script, $body, $simple_mode = false, $http_header = false, $identify = false)
	{
		$this->_logs[] = $this->paypal->l('Making new connection to').' \''.$host.$script.'\'';

		if (function_exists('curl_exec'))
			$return = $this->_connectByCURL($host.$script, $body, $http_header, $identify);

		if (isset($return) && $return)
			return $return;

		$tmp = $this->_connectByFSOCK($host, $script, $body);

		if (!$simple_mode || !preg_match('/[A-Z]+=/', $tmp, $result))
			return $tmp;

		return Tools::substr($tmp, strpos($tmp, $result[0]));
	}

	public function getLogs()
	{
		return $this->_logs;
	}

	/************************************************************/
	/********************** CONNECT METHODS *********************/
	/************************************************************/
	private function _connectByCURL($url, $body, $http_header = false, $identify = false)
	{
		$ch = @curl_init();

		if (!$ch)
			$this->_logs[] = $this->paypal->l('Connect failed with CURL method');
		else
		{
			$this->_logs[] = $this->paypal->l('Connect with CURL method successful');
			$this->_logs[] = '<b>'.$this->paypal->l('Sending this params:').'</b>';
			$this->_logs[] = $body;

			@curl_setopt($ch, CURLOPT_URL, 'https://'.$url);

			if ($identify)
				@curl_setopt($ch, CURLOPT_USERPWD, Configuration::get('PAYPAL_LOGIN_CLIENT_ID').':'.Configuration::get('PAYPAL_LOGIN_SECRET'));

			@curl_setopt($ch, CURLOPT_POST, true);
			if ($body)
				@curl_setopt($ch, CURLOPT_POSTFIELDS, $body);
			@curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
			@curl_setopt($ch, CURLOPT_HEADER, false);
			@curl_setopt($ch, CURLOPT_TIMEOUT, 30);
			@curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
			@curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
			@curl_setopt($ch, CURLOPT_SSLVERSION, defined('CURL_SSLVERSION_TLSv1') ? CURL_SSLVERSION_TLSv1 : 1);
			@curl_setopt($ch, CURLOPT_VERBOSE, false);
			if ($http_header)
				@curl_setopt($ch, CURLOPT_HTTPHEADER, $http_header);

			$result = @curl_exec($ch);

			if (!$result)
				$this->_logs[] = $this->paypal->l('Send with CURL method failed ! Error:').' '.curl_error($ch);
			else
				$this->_logs[] = $this->paypal->l('Send with CURL method successful');

			@curl_close($ch);
		}
		return $result ? $result : false;
	}

	private function _connectByFSOCK($host, $script, $body)
	{
		$fp = @fsockopen('tls://'.$host, 443, $errno, $errstr, 4);

		if (!$fp)
			$this->_logs[] = $this->paypal->l('Connect failed with fsockopen method');
		else
		{
			$header = $this->_makeHeader($host, $script, Tools::strlen($body));
			$this->_logs[] = $this->paypal->l('Sending this params:').' '.$header.$body;

			@fputs($fp, $header.$body);

			$tmp = '';
			while (!feof($fp))
				$tmp .= trim(fgets($fp, 1024));

			fclose($fp);

			if (!isset($tmp) || $tmp == false)
				$this->_logs[] = $this->paypal->l('Send with fsockopen method failed !');
			else
				$this->_logs[] = $this->paypal->l('Send with fsockopen method successful');
		}
		return isset($tmp) ? $tmp : false;
	}

	private function _makeHeader($host, $script, $lenght)
	{
		return 'POST '.(string)$script.' HTTP/1.1'."\r\n".
			'Host: '.(string)$host."\r\n".
			'Content-Type: application/x-www-form-urlencoded'."\r\n".
			'Content-Length: '.(int)$lenght."\r\n".
			'Connection: close'."\r\n\r\n";
	}
}