/**
* Post back to PayPal to check whether this request is a valid one
*
* @param Zend_Http_Client_Adapter_Interface $httpAdapter
* @throws Exception
*/
protected function _postBack(Zend_Http_Client_Adapter_Interface $httpAdapter)
{
$sReq = '';
foreach ($this->_request as $k => $v) {
$sReq .= '&' . $k . '=' . urlencode(stripslashes($v));
}
$sReq .= "&cmd=_notify-validate";
$sReq = substr($sReq, 1);
$this->_debugData['postback'] = $sReq;
$this->_debugData['postback_to'] = $this->_config->getPaypalUrl();
$httpAdapter->addOption(CURLOPT_SSLVERSION, 6);
//6 == CURL_SSLVERSION_TLSv1_2
$httpAdapter->write(Zend_Http_Client::POST, $this->_config->getPaypalUrl(), '1.1', array(), $sReq);
try {
$response = $httpAdapter->read();
} catch (Exception $e) {
$this->_debugData['http_error'] = array('error' => $e->getMessage(), 'code' => $e->getCode());
throw $e;
}
$this->_debugData['postback_result'] = $response;
// =====================================================================
// Changed from default code. Paypal now regularly returns a 100
// response with an empty body followed by a 200 response with the
// VERIFIED/INVALID message. The code below will check the last
// response for the VERIFIED/INVALID code rather than the first.
//
// ref: http://www.dhmedia.com.au/blog/debugging-paypal-ipn-postback-failure-magent
// Magento 2 Pull Request: https://github.com/magento/magento2/pull/136
$response = preg_split('/^\\r?$/m', $response);
$response = trim(end($response));
// =====================================================================
if ($response != 'VERIFIED') {
throw new Exception('PayPal IPN postback failure. See ' . self::DEFAULT_LOG_FILE . ' for details.');
}
unset($this->_debugData['postback'], $this->_debugData['postback_result']);
}
