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<?php
declare(strict_types=1);
namespace OpenTelemetry\Context\Propagation;
use function preg_replace;
/**
* Some servers concatenate multiple headers with ';' -- we need to replace these with ','
* This is still a workaround and doesn't get around the problem fully, specifically it doesn't
* handle edge cases where the header has a trailing ';' or an empty trace state.
* We also need to trim trailing separators from the header, found when a header is empty.
*/
final class SanitizeCombinedHeadersPropagationGetter implements PropagationGetterInterface
{
private const LIST_MEMBERS_SEPARATOR = ',';
private const SERVER_CONCAT_HEADERS_REGEX = '/;(?=[^,=;]*=|$)/';
private const TRAILING_LEADING_SEPARATOR_REGEX = '/^' . self::LIST_MEMBERS_SEPARATOR . '+|' . self::LIST_MEMBERS_SEPARATOR . '+$/';
private PropagationGetterInterface $getter;
public function __construct(PropagationGetterInterface $getter)
{
$this->getter = $getter;
}
public function keys($carrier): array
{
return $this->getter->keys($carrier);
}
public function get($carrier, string $key): ?string
{
$value = $this->getter->get($carrier, $key);
if ($value === null) {
return null;
}
return preg_replace(
[self::SERVER_CONCAT_HEADERS_REGEX, self::TRAILING_LEADING_SEPARATOR_REGEX],
[self::LIST_MEMBERS_SEPARATOR],
$value,
);
}
}
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