AgreementLink::getAgreementFromUriParameters

static function getAgreementFromUriParameters(array $parameters = array())
{
	self::clearErrors();

	$data =$parameters['data'];
	$sec = $parameters['sec'];
	if (!$data || !$sec)
	{
		self::$errors[] = new Error('Parameters not found', 1);
		return null;
	}

	$data = base64_decode($data);
	$sec = base64_decode($sec);
	if (!$data || !$sec)
	{
		self::$errors[] = new Error('Can not decode parameters', 2);
		return null;
	}

	try
	{
		$signer = new Signer();
		if (!$signer->validate($data, $sec, self::SIGN_SALT))
		{
			self::$errors[] = new Error('Parameters signature is not valid', 3);
			return null;
		}
	}
	catch (Exception $exception)
	{
		self::$errors[] = new Error('Parameters signature error: ' . $exception->getMessage(), 7);
		return null;
	}

	try
	{
		$data = Json::decode($data);
	}
	catch (Exception $exception)
	{
		$data = null;
	}
	if (!$data || !isset($data['id']) || !isset($data['replace']))
	{
		self::$errors[] = new Error('Decode data parameters failed', 6);
		return null;
	}

	$agreement = new Agreement($data['id'], $data['replace']);
	if (!$agreement->isExist())
	{
		self::$errors[] = new Error('Agreement is not exist', 4);
		return null;
	}
	if (!$agreement->isActive())
	{
		self::$errors[] = new Error('Agreement is not active', 5);
		return null;
	}

	return $agreement;
}