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<?php
declare(strict_types=1);
namespace OpenTelemetry\API\Trace\Propagation;
use function strlen;
class TraceContextValidator
{
public const TRACE_FLAG_LENGTH = 2;
public const TRACE_VERSION_REGEX = '/^(?!ff)[\da-f]{2}$/';
/**
* @param string $traceVersion
* @return bool Returns a value that indicates whether a trace version is valid.
*/
public static function isValidTraceVersion(string $traceVersion): bool
{
return 1 === preg_match(self::TRACE_VERSION_REGEX, $traceVersion);
}
/**
* @return bool Returns a value that indicates whether trace flag is valid
* TraceFlags must be exactly 1 bytes (1 char) representing a bit field
*/
public static function isValidTraceFlag(string $traceFlag): bool
{
return ctype_xdigit($traceFlag) && strlen($traceFlag) === self::TRACE_FLAG_LENGTH;
}
}
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