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<?php
declare(strict_types=1);
namespace Bakame\Http\StructuredFields;
use Stringable;
use Throwable;
use function preg_match;
use function preg_replace_callback;
use function rawurldecode;
use function rawurlencode;
use function str_contains;
/**
* @see https://datatracker.ietf.org/doc/html/draft-ietf-httpbis-sfbis#section-4.2.10
*/
final class DisplayString
{
private function __construct(private readonly string $value)
{
}
public static function tryFromEncoded(Stringable|string $encoded): ?self
{
try {
return self::fromEncoded($encoded);
} catch (Throwable) {
return null;
}
}
/**
* Returns a new instance from a Base64 encoded string.
*/
public static function fromEncoded(Stringable|string $encoded): self
{
$encoded = (string) $encoded;
if (1 === preg_match('/[^\x20-\x7E]/i', $encoded)) {
throw new SyntaxError('The display string '.$encoded.' contains invalid characters.');
}
if (!str_contains($encoded, '%')) {
return new self($encoded);
}
if (1 === preg_match('/%(?![0-9a-f]{2})/', $encoded)) {
throw new SyntaxError('The display string '.$encoded.' contains invalid utf-8 encoded sequence.');
}
$decoded = (string) preg_replace_callback(
',%[a-f0-9]{2},',
fn (array $matches): string => rawurldecode($matches[0]),
$encoded
);
if (1 !== preg_match('//u', $decoded)) {
throw new SyntaxError('The display string '.$encoded.' contains invalid characters.');
}
return new self($decoded);
}
/**
* Returns a new instance from a raw decoded string.
*/
public static function fromDecoded(Stringable|string $decoded): self
{
return new self((string) $decoded);
}
/**
* Returns the decoded string.
*/
public function decoded(): string
{
return $this->value;
}
/**
* Returns the base64 encoded string.
*/
public function encoded(): string
{
return (string) preg_replace_callback(
'/[%"\x00-\x1F\x7F-\xFF]/',
static fn (array $matches): string => strtolower(rawurlencode($matches[0])),
$this->value
);
}
public function equals(mixed $other): bool
{
return $other instanceof self && $other->value === $this->value;
}
public function type(): Type
{
return Type::DisplayString;
}
}
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