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<?php
/**
 * @package	HikaShop for Joomla!
 * @version	4.4.1
 * @author	hikashop.com
 * @copyright	(C) 2010-2021 HIKARI SOFTWARE. All rights reserved.
 * @license	GNU/GPLv3 http://www.gnu.org/licenses/gpl-3.0.html
 */
defined('_JEXEC') or die('Restricted access');
?><?php
class plgHikashoppaymentPaypalintegralevolution extends
hikashopPaymentPlugin {
	var $accepted_currencies = array (
		'AUD','CAD','EUR','GBP','JPY','USD','NZD','CHF','HKD','SGD','SEK','DKK','PLN','NOK','HUF','CZK'
	);

	var $multiple = true;
	var $name = 'paypalintegralevolution';
	var $doc_form = 'paypalintegralevolution';

	public function onBeforeOrderCreate(& $order, & $do) {
		if (parent::onBeforeOrderCreate($order, $do) === true)
			return true;

		if (empty ($this->payment_params->email) &&
$this->plugin_data->payment_id == $order->order_payment_id) {
			$this->app->enqueueMessage('Please check your
&quot;PayPal&quot; plugin configuration');
			$do = false;
		}
	}

	public function onAfterOrderConfirm(& $order, & $methods,
$method_id) {
		parent::onAfterOrderConfirm($order, $methods, $method_id);

		if ($this->currency->currency_locale['int_frac_digits']
> 2)
			$this->currency->currency_locale['int_frac_digits'] =
2;

		$notify_url = HIKASHOP_LIVE .
'index.php?option=com_hikashop&ctrl=checkout&task=notify&notif_payment='
. $this->name . '&tmpl=component&lang=' .
$this->locale . $this->url_itemid;
		$return_url = HIKASHOP_LIVE .
'index.php?option=com_hikashop&ctrl=checkout&task=after_end&order_id='
. $order->order_id . $this->url_itemid;
		$cancel_url = HIKASHOP_LIVE .
'index.php?option=com_hikashop&ctrl=order&task=cancel_order&order_id='
. $order->order_id . $this->url_itemid;

		$tax_total = '';
		$discount_total = '';
		$debug = @ $this->payment_params->debug;

		$vars = array (
			'cmd' => '_ext-enter',
			'redirect_cmd' => '_cart',
			'upload' => '1',
			'business' => $this->payment_params->email,
			'receiver_email' => $this->payment_params->email,
			'invoice' => $order->order_id,
			'currency_code' => $this->currency->currency_code,
			'return' => $return_url,
			'notify_url' => $notify_url,
			'cancel_return' => $cancel_url,
			'test_ipn' => $debug,
			'shipping' => '0',
			'charset' => 'utf-8',
			'bn' => 'HikariSoftware_Cart_WPS'
		);

		if (!empty ($this->payment_params->address_type)) {
			$address_type = $this->payment_params->address_type .
'_address';
			$address = $this->app->getUserState(HIKASHOP_COMPONENT .
'.' . $address_type);
			if (!empty ($address)) {
				if (!isset ($this->payment_params->address_override)) {
					$this->payment_params->address_override = '1';
				}

				$vars['address_override'] =
$this->payment_params->address_override;
				$vars['billing_first_name'] = @ $order->cart->
$address_type->address_firstname;
				$vars['billing_last_name'] = @ $order->cart->
$address_type->address_lastname;
				$address1 = '';
				$address2 = '';

				if (!empty ($order->cart-> $address_type->address_street2))
					$address2 = substr($order->cart->
$address_type->address_street2, 0, 99);

				if (!empty ($order->cart-> $address_type->address_street)) {
					if (strlen($order->cart-> $address_type->address_street) >
100) {
						$address1 = substr($order->cart->
$address_type->address_street, 0, 99);
						if (empty ($address2))
							$address2 = substr($order->cart->
$address_type->address_street, 99, 199);
					} else {
						$address1 = $order->cart-> $address_type->address_street;
					}
				}

				$vars['billing_address1'] = $address1;
				$vars['billing_address2'] = $address2;
				$vars['billing_zip'] = @ $order->cart->
$address_type->address_post_code;
				$vars['billing_city'] = @ $order->cart->
$address_type->address_city;
				if ((!isset ($order->cart->
$address_type->address_state->zone_code_3) ||
is_numeric($order->cart->
$address_type->address_state->zone_code_3)) && !empty
($order->cart-> $address_type->address_country->zone_name)) {
					$vars['billing_state'] = @ $order->cart->
$address_type->address_state->zone_name;
				} else {
					$vars['billing_state'] = @ $order->cart->
$address_type->address_state->zone_code_3;
				}
				$vars['billing_country'] = @ $order->cart->
$address_type->address_country->zone_code_2;
				$vars['email'] = $this->user->user_email;
				$vars['night_phone_b'] = @ $order->cart->
$address_type->address_telephone;

			}
			elseif (!empty
($order->cart->billing_address->address_country->zone_code_2))
{
				$vars['lc'] =
$order->cart->billing_address->address_country->zone_code_2;
			}
		}
		elseif (!empty
($order->cart->billing_address->address_country->zone_code_2))
{
			$vars['lc'] =
$order->cart->billing_address->address_country->zone_code_2;
		}

		if (!empty ($this->payment_params->logoImage)) {
			$vars['logoImage'] = $this->payment_params->logoImage;
		}

		if (empty ($this->payment_params->details)) {
			$vars['subtotal'] =
round($order->cart->full_total->prices[0]->price_value_with_tax,
(int)
$this->currency->currency_locale['int_frac_digits']);
			$vars['item_name'] =
JText::_('CART_PRODUCT_TOTAL_PRICE');
		} else {
			$i = 1;
			$tax = 0;
			$config = & hikashop_config();
			$group = $config->get('group_options', 0);
			$subtotal = 0;
			foreach ($order->cart->products as $product) {
				if ($group && $product->order_product_option_parent_id)
					continue;
				$subtotal += (round($product->order_product_price, (int)
$this->currency->currency_locale['int_frac_digits']) *
$product->order_product_quantity);
				$tax += round($product->order_product_tax, (int)
$this->currency->currency_locale['int_frac_digits']) *
$product->order_product_quantity;
			}
			$vars['subtotal'] = $subtotal + $order->order_payment_price
- $order->order_discount_price;

			if (!empty ($order->order_shipping_price) &&
bccomp($order->order_shipping_price, 0, 5)) {
				$vars['shipping'] = round($order->order_shipping_price - @
$order->order_shipping_tax, (int)
$this->currency->currency_locale['int_frac_digits']);
				$tax += round($order->order_shipping_tax, (int)
$this->currency->currency_locale['int_frac_digits']);
			}

			if (bccomp($tax, 0, 5))
				$vars['tax'] = $tax;
		}

		if ((isset ($this->payment_params->validation) &&
$this->payment_params->validation)) {
			$vars['paymentaction'] = 'authorization';
		}


		if($this->payment_params->sandbox){
			$this->payment_params->url =
'https://securepayments.sandbox.paypal.com/webapps/HostedSoleSolutionApp/webflow/sparta/hostedSoleSolutionProcess';
		}else{
			$this->payment_params->url =
'https://securepayments.paypal.com/webapps/HostedSoleSolutionApp/webflow/sparta/hostedSoleSolutionProcess';
		}
		$this->vars = $vars;

		return $this->showPage('end');
	}

	public function onPaymentNotification(& $statuses) {
		$vars = array();
		$data = array();
		$filter = JFilterInput::getInstance();
		$app = JFactory::getApplication();
		foreach ($_REQUEST as $key => $value) {
			$key = $filter->clean($key);
			if (preg_match('#^[0-9a-z_-]{1,30}$#i', $key) &&
!preg_match('#^cmd$#i', $key)) {
				if(!HIKASHOP_J30) {
					$value = JRequest::getString($key);
				} else {
					$value = $app->input->getString($key);
				}
				$vars[$key] = $value;
				$data[] = $key . '=' . urlencode($value);
			}
		}

		$data = implode('&', $data) .
'&cmd=_notify-validate';

		$dbOrder = $this->getOrder((int) @ $vars['invoice']);
		$this->loadPaymentParams($dbOrder);
		if (empty ($this->payment_params))
			return false;
		$this->loadOrderData($dbOrder);

		if ($this->payment_params->debug)
			echo print_r($vars, true) . "\r\n\r\n";

		if (empty ($dbOrder)) {
			echo 'Could not load any order for your notification ' .
@$vars['invoice'];
			return false;
		}

		if ($this->payment_params->debug) {
			echo print_r($dbOrder, true) . "\r\n\r\n";
		}

		$order_id = $dbOrder->order_id;

		$url = HIKASHOP_LIVE .
'administrator/index.php?option=com_hikashop&ctrl=order&task=edit&order_id='
. $order_id;
		$order_text = "\r\n" .
JText::sprintf('NOTIFICATION_OF_ORDER_ON_WEBSITE',
$dbOrder->order_number, HIKASHOP_LIVE);
		$order_text .= "\r\n" . str_replace('<br/>',
"\r\n", JText::sprintf('ACCESS_ORDER_WITH_LINK',
$url));

		if(!empty ($this->payment_params->ips)) {
			$ip = hikashop_getIP();
			$ips = str_replace(
				array('.','*',','),
				array('\.','[0-9]+','|'),
				$this->payment_params->ips
			);
			if(!preg_match('#(' . implode('|', $ips) .
')#', $ip)) {
				$email = new stdClass();
				$email->subject =
JText::sprintf('NOTIFICATION_REFUSED_FOR_THE_ORDER',
'Paypal') . ' ' .
JText::sprintf('IP_NOT_VALID', $dbOrder->order_number);
				$email->body = str_replace('<br/>',
"\r\n", JText::sprintf('NOTIFICATION_REFUSED_FROM_IP',
'Paypal', $ip, implode("\r\n",
$this->payment_params->ips))) . "\r\n\r\n" .
JText::sprintf('CHECK_DOCUMENTATION', HIKASHOP_HELPURL .
'payment-paypal-error#ip') . $order_text;
				$action = false;
				$this->modifyOrder($action, null, null, $email);

				JError::raiseError(403, JText::_('Access Forbidden'));
				return false;
			}
		}

		if($this->payment_params->sandbox) {
			$this->payment_params->url =
'https://securepayments.sandbox.paypal.com/webapps/HostedSoleSolutionApp/webflow/sparta/hostedSoleSolutionProcess';
		} else {
			$this->payment_params->url =
'https://securepayments.paypal.com/webapps/HostedSoleSolutionApp/webflow/sparta/hostedSoleSolutionProcess';
		}

		$response = $this->verifyIPN();

		if(empty($response) || !preg_match('#VERIFIED#i', $response))
{
			$url = parse_url($this->payment_params->url);
			if (!isset ($url['query']))
				$url['query'] = '';

			if (!isset ($url['port'])) {
				if (!empty ($url['scheme']) &&
in_array($url['scheme'],
array('https','ssl'))) {
					$url['port'] = 443;
				} else {
					$url['port'] = 80;
				}
			}

			if (!empty ($url['scheme']) &&
in_array($url['scheme'],
array('https','ssl'))) {
				$url['host_socket'] = 'ssl://' .
$url['host'];
			} else {
				$url['host_socket'] = $url['host'];
			}

			if ($this->payment_params->debug)
				echo print_r($url, true) . "\r\n\r\n";

			$response = $this->sendRequest($url, $data);
		}

		if($response === false) {
			$email = new stdClass();
			$email->subject =
JText::sprintf('NOTIFICATION_REFUSED_FOR_THE_ORDER',
'Paypal') . ' ' .
JText::sprintf('PAYPAL_CONNECTION_FAILED',
$dbOrder->order_number);
			$email->body = str_replace('<br/>', "\r\n",
JText::sprintf('NOTIFICATION_REFUSED_NO_CONNECTION',
'Paypal')) . "\r\n\r\n" .
JText::sprintf('CHECK_DOCUMENTATION', HIKASHOP_HELPURL .
'payment-paypal-error#connection') . $order_text;
			$action = false;
			$this->modifyOrder($action, null, null, $email);

			JError::raiseError(403, JText::_('Access Forbidden'));
			return false;
		}

		$verified = preg_match('#VERIFIED#i', $response);
		if (!$verified) {
			$email = new stdClass();
			if (preg_match('#INVALID#i', $response)) {
				$email->subject =
JText::sprintf('NOTIFICATION_REFUSED_FOR_THE_ORDER',
'Paypal') . 'invalid transaction';
				$email->body = JText::sprintf("Hello,\r\n A paypal notification
was refused because it could not be verified by the paypal server") .
"\r\n\r\n" . JText::sprintf('CHECK_DOCUMENTATION',
HIKASHOP_HELPURL . 'payment-paypal-error#invalidtnx') .
$order_text;
				if ($this->payment_params->debug)
					echo 'invalid transaction' . "\n\n\n";
			} else {
				$email->subject =
JText::sprintf('NOTIFICATION_REFUSED_FOR_THE_ORDER',
'Paypal') . 'invalid response';
				$email->body = JText::sprintf("Hello,\r\n A paypal notification
was refused because the response from the paypal server was invalid")
. "\r\n\r\n" . JText::sprintf('CHECK_DOCUMENTATION',
HIKASHOP_HELPURL . 'payment-paypal-error#invalidresponse') .
$order_text;

				if ($this->payment_params->debug)
					echo 'invalid response' . "\n\n\n";
			}
			$action = false;
			$this->modifyOrder($action, null, null, $email);
			return false;
		}

		$completed = preg_match('#Completed#i',
$vars['payment_status']);
		$pending = preg_match('#Pending#i',
$vars['payment_status']);
		if (!$completed && !$pending) {
			$email = new stdClass();
			$email->subject =
JText::sprintf('PAYMENT_NOTIFICATION_FOR_ORDER',
'Paypal', $vars['payment_status'],
$dbOrder->order_number);
			$email->body = str_replace('<br/>', "\r\n",
JText::sprintf('PAYMENT_NOTIFICATION_STATUS', 'Paypal',
$vars['payment_status'])) . ' ' .
JText::_('STATUS_NOT_CHANGED') . "\r\n\r\n" .
JText::sprintf('CHECK_DOCUMENTATION', HIKASHOP_HELPURL .
'payment-paypal-error#status') . $order_text;
			$action = false;
			$this->modifyOrder($action, null, null, $email);

			if ($this->payment_params->debug)
				echo 'payment ' . $vars['payment_status'] .
"\r\n\r\n";
			return false;
		}

		echo 'PayPal transaction id: ' . $vars['txn_id'] .
"\r\n\r\n";

		$history = new stdClass();
		$history->notified = 0;
		$history->subtotal = @ $vars['mc_gross'] . @
$vars['mc_currency'];
		$history->data = ob_get_clean();

		$price_check = round($dbOrder->order_full_price, (int)
$this->currency->currency_locale['int_frac_digits']);
		if ($price_check != @ $vars['mc_gross'] ||
$this->currency->currency_code != @ $vars['mc_currency'])
{
			$email = new stdClass();
			$email->subject =
JText::sprintf('NOTIFICATION_REFUSED_FOR_THE_ORDER',
'Paypal') . JText::_('INVALID_AMOUNT');
			$email->body = str_replace('<br/>', "\r\n",
JText::sprintf('AMOUNT_RECEIVED_DIFFERENT_FROM_ORDER',
'Paypal', $history->subtotal, $price_check .
$this->currency->currency_code)) . "\r\n\r\n" .
JText::sprintf('CHECK_DOCUMENTATION', HIKASHOP_HELPURL .
'payment-paypal-error#amount') . $order_text;

			$this->modifyOrder($order_id,
$this->payment_params->invalid_status, $history, $email);
			return false;
		}

		if ($completed) {
			$order_status = $this->payment_params->verified_status;
		} else {
			$order_status = $this->payment_params->pending_status;
			$order_text = JText::sprintf('CHECK_DOCUMENTATION',
HIKASHOP_HELPURL . 'payment-paypal-error#pending') .
"\r\n\r\n" . $order_text;
		}
		if ($dbOrder->order_status == $order_status)
			return true;

		$config = & hikashop_config();
		if ($config->get('order_confirmed_status',
'confirmed') == $order_status) {
			$history->notified = 1;
		}

		$email = new stdClass();
		$email->subject =
JText::sprintf('PAYMENT_NOTIFICATION_FOR_ORDER',
'Paypal', $vars['payment_status'],
$dbOrder->order_number);
		$email->body = str_replace('<br/>', "\r\n",
JText::sprintf('PAYMENT_NOTIFICATION_STATUS', 'Paypal',
$vars['payment_status'])) . ' ' .
JText::sprintf('ORDER_STATUS_CHANGED',
hikashop_orderStatus($order_status)) . "\r\n\r\n" . $order_text;

		$this->modifyOrder($order_id, $order_status, $history, $email);

		return true;
	}

	public function onPaymentConfiguration(&$element) {
		$subtask = JRequest::getCmd('subtask', '');
		if ($subtask == 'ips') {
			$ips = null;
			echo implode(',', $this->_getIPList($ips));
			exit;
		}

		parent::onPaymentConfiguration($element);
		$this->address = hikashop_get('type.address');

		if(empty($element->payment_params->email)) {
			$app = JFactory::getApplication();
			$lang = JFactory::getLanguage();
			$locale = strtolower(substr($lang->get('tag'), 0, 2));
			$app->enqueueMessage(JText::sprintf('ENTER_INFO_REGISTER_IF_NEEDED',
'PayPal', JText::_('HIKA_EMAIL'), 'PayPal',
'https://www.paypal.com/' . $locale .
'/mrb/pal=SXL9FKNKGAEM8'));
		}
	}

	public function onPaymentConfigurationSave(&$element) {
		if( !empty($element->payment_params->ips) )
			$element->payment_params->ips = explode(',',
$element->payment_params->ips);
		return true;
	}

	public function getPaymentDefaultValues(&$element) {
		$element->payment_name = 'PayPal Integral Evolution';
		$element->payment_description = 'You can pay by credit card or
paypal using this payment method';
		$element->payment_images =
'MasterCard,VISA,Credit_card,PayPal';
		$element->payment_params->ips = '';
		$element->payment_params->details = 0;
		$element->payment_params->invalid_status = 'cancelled';
		$element->payment_params->pending_status = 'created';
		$element->payment_params->verified_status = 'confirmed';
		$element->payment_params->address_override = 1;
		$element->payment_params->iframe = 0;
	}

	protected function verifyIPN() {
		if(!function_exists('curl_version'))
			return false;

		$raw_post_data = file_get_contents('php://input');
		$raw_post_array = explode('&', $raw_post_data);
		$myPost = array();
		foreach ($raw_post_array as $keyval) {
			$keyval = explode('=', $keyval);
			if (count($keyval) == 2) {
				if ($keyval[0] === 'payment_date') {
					if (substr_count($keyval[1], '+') === 1) {
						$keyval[1] = str_replace('+', '%2B',
$keyval[1]);
					}
				}
				$myPost[$keyval[0]] = urldecode($keyval[1]);
			}
		}
		$req = 'cmd=_notify-validate';
		$get_magic_quotes_exists = false;
		if (function_exists('get_magic_quotes_gpc')) {
			$get_magic_quotes_exists = true;
		}
		foreach ($myPost as $key => $value) {
			if ($get_magic_quotes_exists == true && get_magic_quotes_gpc()
== 1) {
				$value = urlencode(stripslashes($value));
			} else {
				$value = urlencode($value);
			}
			$req .= "&$key=$value";
		}

		if(empty($this->payment_params->url))
			$this->payment_params->url =
'https://www.paypal.com/cgi-bin/webscr';
		if(strpos($this->payment_params->url, 'sandbox') ===
false) {
			$url = 'https://ipnpb.paypal.com/cgi-bin/webscr';
		} else {
			$url = 'https://ipnpb.sandbox.paypal.com/cgi-bin/webscr';
		}

		$ch = curl_init($url);
		curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
		curl_setopt($ch, CURLOPT_POST, 1);
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
		curl_setopt($ch, CURLOPT_POSTFIELDS, $req);
		curl_setopt($ch, CURLOPT_SSLVERSION, 6);
		curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 1);
		curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
		curl_setopt($ch, CURLOPT_FORBID_REUSE, 1);
		curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30);
		curl_setopt($ch, CURLOPT_HTTPHEADER, array('Connection:
Close'));
		$res = curl_exec($ch);

		if ( ! ($res)) {
			$errno = curl_errno($ch);
			$errstr = curl_error($ch);
			curl_close($ch);
			$this->writeToLog("cURL error: [$errno] $errstr");
			return false;
		}

		$info = curl_getinfo($ch);
		$http_code = $info['http_code'];
		if ($http_code != 200) {
			$this->writeToLog("PayPal responded with http code
$http_code");
			return false;
		}
		curl_close($ch);

		return $res;
	}

	public function sendRequest($url, $data){
		$response = $this->_sendRequestSocket($url,$data);
		if(!$response)
			$response = $this->_sendRequestCURL($url,$data);
		return $response;
	}

	protected function _sendRequestCURL($url, $data) {
		if(!function_exists('curl_version')) {
			if($this->payment_params->debug)
				echo 'CURL is not available'. "\r\n\r\n";
			return false;
		}

		$uri = $url['scheme'] . '://' .
$url['host'] . $url['path'] . ($url['query']
!= '' ? '?' . $url['query'] : '');
		$ch = curl_init($uri);

		if(!$ch){
			if($this->payment_params->debug)
				echo 'CURL could not be initialized'. "\r\n\r\n";
			return false;
		}

		curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
		curl_setopt($ch, CURLOPT_POST, 1);
		curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
		curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
		curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 1);
		curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
		curl_setopt($ch, CURLOPT_SSLVERSION, CURL_SSLVERSION_TLSv1);
		curl_setopt($ch, CURLOPT_FORBID_REUSE, 1);
		curl_setopt($ch, CURLOPT_HTTPHEADER, array('Connection:
Close'));
		curl_setopt($ch, CURLOPT_FAILONERROR,true);

		if($this->payment_params->debug) {
			echo print_r($data, true) . "\r\n\r\n";
		}

		$response = curl_exec($ch);

		$errno = curl_errno($ch);
		$error = curl_error($ch);

		curl_close($ch);

		if (!$response) {
			if($this->payment_params->debug)
				echo 'CURL request didn\t return any data'.
"\r\n\r\n";
			return false;
		}

		if($errno){
			if($this->payment_params->debug) {
				echo 'CURL error number: '.$errno. "\r\n\r\n";
				echo 'CURL error message: '.$error. "\r\n\r\n";
			}
		}

		if($this->payment_params->debug) {
			echo print_r($response, true) . "\r\n\r\n";
		}

		return $response;
	}

	protected function _sendRequestSocket($url, $data){
		if(!function_exists('fsockopen')) {
			if($this->payment_params->debug)
				echo 'fsockopen function does not exist'.
"\r\n\r\n";
			return false;
		}
		if(!is_callable('fsockopen')) {
			if($this->payment_params->debug)
				echo 'fsockopen function is not callable'.
"\r\n\r\n";
			return false;
		}

		$fp = fsockopen($url['host_socket'], $url['port'],
$errno, $errstr, 30);
		if(!$fp) {
			if($this->payment_params->debug)
				echo 'fsockopen connection couldn\'t be established'.
"\r\n\r\n";
			return false;
		}

		$uri = $url['path'] . ($url['query'] != ''
? '?' . $url['query'] : '');
		$header = 'POST '.$uri.' HTTP/1.1'."\r\n".
			'User-Agent: PHP/'.phpversion()."\r\n".
			'Referer: '.hikashop_currentURL()."\r\n".
			'Server:
'.$_SERVER['SERVER_SOFTWARE']."\r\n".
			'Host: '.$url['host']."\r\n".
			'Content-Type:
application/x-www-form-urlencoded'."\r\n".
			'Content-Length: '.strlen($data)."\r\n".
			'Accept: */'.'*'."\r\n".
			'Connection: close'."\r\n\r\n";

		if($this->payment_params->debug) {
			echo print_r($header, true) . "\r\n\r\n";
			echo print_r($data, true) . "\r\n\r\n";
		}

		fwrite($fp, $header . $data);
		$response = '';
		while(!feof($fp)) {
			$response .= fgets($fp, 1024);
		}
		fclose ($fp);

		if(empty($response)){
			if($this->payment_params->debug)
				echo 'fsockopen request did not return any data'.
"\r\n\r\n";
			return false;
		}

		if($this->payment_params->debug) {
			echo print_r($response, true) . "\r\n\r\n";
		}

		$response = substr($response, strpos($response, "\r\n\r\n") +
strlen("\r\n\r\n"));

		return $response;
	}

	protected function _getIPList(&$ipList) {
		$hosts = array (
			'www.paypal.com',
			'notify.paypal.com',
			'ipn.sandbox.paypal.com'
		);

		$ipList = array ();
		foreach ($hosts as $host) {
			$ips = gethostbynamel($host);
			if (!empty ($ips)) {
				if (empty ($ipList))
					$ipList = $ips;
				else
					$ipList = array_merge($ipList, $ips);
			}
		}

		if (empty ($ipList))
			return $ipList;

		$newList = array ();
		foreach ($ipList as $k => $ip) {
			$ipParts = explode('.', $ip);
			if (count($ipParts) == 4) {
				array_pop($ipParts);
				$ip = implode('.', $ipParts) . '.*';
			}
			if (!in_array($ip, $newList))
				$newList[] = $ip;
		}
		return $newList;
	}
}