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Filename : Converter.php
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<?php

/**
 * League.Uri (https://uri.thephpleague.com)
 *
 * (c) Ignace Nyamagana Butera <nyamsprod@gmail.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
declare (strict_types=1);
namespace PleskGrafana\League\Uri\IPv6;

use Stringable;
use ValueError;
use function filter_var;
use function implode;
use function inet_pton;
use function str_split;
use function strtolower;
use function unpack;
use const FILTER_FLAG_IPV6;
use const FILTER_VALIDATE_IP;
final class Converter
{
    /**
     * Significant 10 bits of IP to detect Zone ID regular expression pattern.
     *
     * @var string
     */
    private const HOST_ADDRESS_BLOCK = "\xfe\x80";
    public static function compressIp(string $ipAddress) : string
    {
        return match (filter_var($ipAddress, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
            \false => throw new ValueError('The submitted IP is not a valid IPv6 address.'),
            default => strtolower((string) \inet_ntop((string) inet_pton($ipAddress))),
        };
    }
    public static function expandIp(string $ipAddress) : string
    {
        if (\false === filter_var($ipAddress, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
            throw new ValueError('The submitted IP is not a valid IPv6 address.');
        }
        $hex = (array) unpack('H*hex', (string) inet_pton($ipAddress));
        return implode(':', str_split(strtolower($hex['hex'] ?? ''), 4));
    }
    public static function compress(Stringable|string|null $host) : ?string
    {
        $components = self::parse($host);
        if (null === $components['ipAddress']) {
            return match ($host) {
                null => $host,
                default => (string) $host,
            };
        }
        $components['ipAddress'] = self::compressIp($components['ipAddress']);
        return self::build($components);
    }
    public static function expand(Stringable|string|null $host) : ?string
    {
        $components = self::parse($host);
        if (null === $components['ipAddress']) {
            return match ($host) {
                null => $host,
                default => (string) $host,
            };
        }
        $components['ipAddress'] = self::expandIp($components['ipAddress']);
        return self::build($components);
    }
    private static function build(array $components) : string
    {
        $components['ipAddress'] ??= null;
        $components['zoneIdentifier'] ??= null;
        if (null === $components['ipAddress']) {
            return '';
        }
        return '[' . $components['ipAddress'] . match ($components['zoneIdentifier']) {
            null => '',
            default => '%' . $components['zoneIdentifier'],
        } . ']';
    }
    /**]
     * @param Stringable|string|null $host
     *
     * @return array{ipAddress:string|null, zoneIdentifier:string|null}
     */
    private static function parse(Stringable|string|null $host) : array
    {
        if (null === $host) {
            return ['ipAddress' => null, 'zoneIdentifier' => null];
        }
        $host = (string) $host;
        if ('' === $host) {
            return ['ipAddress' => null, 'zoneIdentifier' => null];
        }
        if (!\str_starts_with($host, '[')) {
            return ['ipAddress' => null, 'zoneIdentifier' => null];
        }
        if (!\str_ends_with($host, ']')) {
            return ['ipAddress' => null, 'zoneIdentifier' => null];
        }
        [$ipv6, $zoneIdentifier] = \explode('%', \substr($host, 1, -1), 2) + [1 => null];
        if (\false === filter_var($ipv6, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
            return ['ipAddress' => null, 'zoneIdentifier' => null];
        }
        return match (\true) {
            null === $zoneIdentifier, \is_string($ipv6) && \str_starts_with((string) inet_pton($ipv6), self::HOST_ADDRESS_BLOCK) => ['ipAddress' => $ipv6, 'zoneIdentifier' => $zoneIdentifier],
            default => ['ipAddress' => null, 'zoneIdentifier' => null],
        };
    }
}