/**
* Generate MAC string from array of fields.
*
* @param array $data Array of VK_* fields
* @param string $encoding Encoding
*
* @return string MAC key
*/
protected function generateSignature(array $data, $encoding = 'UTF-8')
{
// Request mac
$fields = array('ver', 'id', 'ecuno', 'eamount', 'cur', 'datetime', 'feedBackUrl', 'delivery');
if (isset($data['respcode'])) {
// Response mac
$fields = array('ver', 'id', 'ecuno', 'receipt_no', 'eamount', 'cur', 'respcode', 'datetime', 'msgdata', 'actiontext');
$data['receipt_no'] = ProtocolHelper::mbStrPad($data['receipt_no'], 6, "0", STR_PAD_LEFT, $encoding);
$data['msgdata'] = ProtocolHelper::mbStrPad($data['respcode'] === self::PAYMENT_RESPONSE_ABORT && strlen($data['msgdata']) == 0 ? ' ' : $data['msgdata'], 40, " ", STR_PAD_RIGHT, $encoding);
$data['respcode'] = ProtocolHelper::mbStrPad($data['respcode'], 3, "0", STR_PAD_LEFT, $encoding);
$data['actiontext'] = ProtocolHelper::mbStrPad($data['actiontext'], 40, " ", STR_PAD_RIGHT, $encoding);
}
if (isset($data['feedBackUrl'])) {
$data['feedBackUrl'] = ProtocolHelper::mbStrPad($data['feedBackUrl'], 128);
}
// Pad to correct length
$data['ver'] = ProtocolHelper::mbStrPad($data['ver'], 3, "0", STR_PAD_LEFT, $encoding);
$data['id'] = ProtocolHelper::mbStrPad($data['id'], 10, " ", STR_PAD_RIGHT, $encoding);
$data['ecuno'] = ProtocolHelper::mbStrPad($data['ecuno'], 12, "0", STR_PAD_LEFT, $encoding);
$data['eamount'] = ProtocolHelper::mbStrPad($data['eamount'], 12, "0", STR_PAD_LEFT, $encoding);
$data['cur'] = ProtocolHelper::mbStrPad($data['cur'], 3, " ", STR_PAD_RIGHT, $encoding);
$data['datetime'] = ProtocolHelper::mbStrPad($data['datetime'], 14, " ", STR_PAD_RIGHT, $encoding);
$mac = '';
foreach ($fields as $key) {
// Check if field exists
if (!isset($data[$key]) || $data[$key] === false) {
throw new \UnexpectedValueException(vsprintf('Field %s must be set to use ECommerce protocol.', array($key)));
}
$mac .= $data[$key];
}
return $mac;
}
