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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 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],
};
}
}
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