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<?php
declare(strict_types=1);
namespace OTPHP;
use function assert;
use function count;
use InvalidArgumentException;
use Throwable;
/**
* This class is used to load OTP object from a provisioning Uri.
*
* @see \OTPHP\Test\FactoryTest
*/
final class Factory implements FactoryInterface
{
public static function loadFromProvisioningUri(string $uri): OTPInterface
{
try {
$parsed_url = Url::fromString($uri);
$parsed_url->getScheme() === 'otpauth' || throw new InvalidArgumentException('Invalid scheme.');
} catch (Throwable $throwable) {
throw new InvalidArgumentException('Not a valid OTP provisioning URI', $throwable->getCode(), $throwable);
}
$otp = self::createOTP($parsed_url);
self::populateOTP($otp, $parsed_url);
return $otp;
}
private static function populateParameters(OTPInterface $otp, Url $data): void
{
foreach ($data->getQuery() as $key => $value) {
$otp->setParameter($key, $value);
}
}
private static function populateOTP(OTPInterface $otp, Url $data): void
{
self::populateParameters($otp, $data);
$result = explode(':', rawurldecode(mb_substr($data->getPath(), 1)));
if (count($result) < 2) {
$otp->setIssuerIncludedAsParameter(false);
return;
}
if ($otp->getIssuer() !== null) {
$result[0] === $otp->getIssuer() || throw new InvalidArgumentException(
'Invalid OTP: invalid issuer in parameter'
);
$otp->setIssuerIncludedAsParameter(true);
}
assert($result[0] !== '');
$otp->setIssuer($result[0]);
}
private static function createOTP(Url $parsed_url): OTPInterface
{
switch ($parsed_url->getHost()) {
case 'totp':
$totp = TOTP::createFromSecret($parsed_url->getSecret());
$totp->setLabel(self::getLabel($parsed_url->getPath()));
return $totp;
case 'hotp':
$hotp = HOTP::createFromSecret($parsed_url->getSecret());
$hotp->setLabel(self::getLabel($parsed_url->getPath()));
return $hotp;
default:
throw new InvalidArgumentException(sprintf('Unsupported "%s" OTP type', $parsed_url->getHost()));
}
}
/**
* @param non-empty-string $data
* @return non-empty-string
*/
private static function getLabel(string $data): string
{
$result = explode(':', rawurldecode(mb_substr($data, 1)));
$label = count($result) === 2 ? $result[1] : $result[0];
assert($label !== '');
return $label;
}
}
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