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<?php
/**
* Authorize.net Class
*
* Integrate the Authorize.net payment gateway in your site using this
* easy to use library. Just see the example code to know how you should
* proceed. Also, remember to read the readme file for this class.
*
* @package Payment Gateway
* @category Library
* @author Md Emran Hasan <phpfour@gmail.com>
* @link http://www.phpfour.com
*/
include_once ('PaymentGateway.php');
class Authorize extends PaymentGateway
{
/**
* Login ID of authorize.net account
*
* @var string
*/
public $login;
/**
* Secret key from authorize.net account
*
* @var string
*/
public $secret;
/**
* Initialize the Authorize.net gateway
*
* @param none
* @return void
*/
public function __construct()
{
parent::__construct();
// Some default values of the class
$this->gatewayUrl = 'https://secure.authorize.net/gateway/transact.dll';
$this->ipnLogFile = 'authorize.ipn_results.log';
// Populate $fields array with a few default
$this->addField('x_Version', '3.0');
$this->addField('x_Show_Form', 'PAYMENT_FORM');
$this->addField('x_Relay_Response', 'TRUE');
}
/**
* Enables the test mode
*
* @param none
* @return none
*/
public function enableTestMode()
{
$this->testMode = TRUE;
$this->addField('x_Test_Request', 'TRUE');
$this->gatewayUrl = 'https://test.authorize.net/gateway/transact.dll';
}
/**
* Set login and secret key
*
* @param string user login
* @param string secret key
* @return void
*/
public function setUserInfo($login, $key)
{
$this->login = $login;
$this->secret = $key;
}
/**
* Prepare a few payment information
*
* @param none
* @return void
*/
public function prepareSubmit()
{
$this->addField('x_Login', $this->login);
$this->addField('x_fp_sequence', $this->fields['x_Invoice_num']);
$this->addField('x_fp_timestamp', time());
$data = $this->fields['x_Login'] . '^' .
$this->fields['x_Invoice_num'] . '^' .
$this->fields['x_fp_timestamp'] . '^' .
$this->fields['x_Amount'] . '^';
$this->addField('x_fp_hash', $this->hmac($this->secret, $data));
}
/**
* Validate the IPN notification
*
* @param none
* @return boolean
*/
public function validateIpn()
{
foreach ($_POST as $field=>$value)
{
$this->ipnData["$field"] = $value;
}
$invoice = intval($this->ipnData['x_invoice_num']);
$pnref = $this->ipnData['x_trans_id'];
$amount = doubleval($this->ipnData['x_amount']);
$result = intval($this->ipnData['x_response_code']);
$respmsg = $this->ipnData['x_response_reason_text'];
$md5source = $this->secret . $this->login . $this->ipnData['x_trans_id'] . $this->ipnData['x_amount'];
$md5 = md5($md5source);
if ($result == '1')
{
// Valid IPN transaction.
$this->logResults(true);
return true;
}
else if ($result != '1')
{
$this->lastError = $respmsg;
$this->logResults(false);
return false;
}
else if (strtoupper($md5) != $this->ipnData['x_MD5_Hash'])
{
$this->lastError = 'MD5 mismatch';
$this->logResults(false);
return false;
}
}
/**
* RFC 2104 HMAC implementation for php.
*
* @author Lance Rushing
* @param string key
* @param string date
* @return string encoded hash
*/
private function hmac ($key, $data)
{
$b = 64; // byte length for md5
if (strlen($key) > $b) {
$key = pack("H*",md5($key));
}
$key = str_pad($key, $b, chr(0x00));
$ipad = str_pad('', $b, chr(0x36));
$opad = str_pad('', $b, chr(0x5c));
$k_ipad = $key ^ $ipad ;
$k_opad = $key ^ $opad;
return md5($k_opad . pack("H*", md5($k_ipad . $data)));
}
}