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<?php
declare(strict_types=1);
namespace Lcobucci\JWT;
use Lcobucci\JWT\Encoding\CannotDecodeContent;
use SodiumException;
use function base64_decode;
use function base64_encode;
use function function_exists;
use function is_string;
use function rtrim;
use function sodium_base642bin;
use function sodium_bin2base64;
use function strtr;
/** @internal */
final class SodiumBase64Polyfill
{
public const SODIUM_BASE64_VARIANT_ORIGINAL = 1;
public const SODIUM_BASE64_VARIANT_ORIGINAL_NO_PADDING = 3;
public const SODIUM_BASE64_VARIANT_URLSAFE = 5;
public const SODIUM_BASE64_VARIANT_URLSAFE_NO_PADDING = 7;
public static function bin2base64(string $decoded, int $variant): string
{
if (! function_exists('sodium_bin2base64')) {
return self::bin2base64Fallback($decoded, $variant); // @codeCoverageIgnore
}
return sodium_bin2base64($decoded, $variant);
}
public static function bin2base64Fallback(string $decoded, int $variant): string
{
$encoded = base64_encode($decoded);
if (
$variant === self::SODIUM_BASE64_VARIANT_URLSAFE
|| $variant === self::SODIUM_BASE64_VARIANT_URLSAFE_NO_PADDING
) {
$encoded = strtr($encoded, '+/', '-_');
}
if (
$variant === self::SODIUM_BASE64_VARIANT_ORIGINAL_NO_PADDING
|| $variant === self::SODIUM_BASE64_VARIANT_URLSAFE_NO_PADDING
) {
$encoded = rtrim($encoded, '=');
}
return $encoded;
}
/** @throws CannotDecodeContent */
public static function base642bin(string $encoded, int $variant): string
{
if (! function_exists('sodium_base642bin')) {
return self::base642binFallback($encoded, $variant); // @codeCoverageIgnore
}
try {
return sodium_base642bin($encoded, $variant, '');
} catch (SodiumException $sodiumException) {
throw CannotDecodeContent::invalidBase64String();
}
}
/** @throws CannotDecodeContent */
public static function base642binFallback(string $encoded, int $variant): string
{
if (
$variant === self::SODIUM_BASE64_VARIANT_URLSAFE
|| $variant === self::SODIUM_BASE64_VARIANT_URLSAFE_NO_PADDING
) {
$encoded = strtr($encoded, '-_', '+/');
}
$decoded = base64_decode($encoded, true);
if (! is_string($decoded)) {
throw CannotDecodeContent::invalidBase64String();
}
return $decoded;
}
}