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<?php
declare(strict_types=1);
namespace OpenTelemetry\API\Trace;
use function strlen;
use function strtolower;
class SpanContextValidator
{
public const VALID_SPAN = '/^[0-9a-f]{16}$/';
public const VALID_TRACE = '/^[0-9a-f]{32}$/';
public const INVALID_SPAN = '0000000000000000';
public const INVALID_TRACE = '00000000000000000000000000000000';
public const SPAN_LENGTH = 16;
public const TRACE_LENGTH = 32;
public const SPAN_LENGTH_BYTES = 8;
/**
* @return bool Returns a value that indicates whether a trace id is valid
*/
public static function isValidTraceId(string $traceId): bool
{
return ctype_xdigit($traceId) && strlen($traceId) === self::TRACE_LENGTH && $traceId !== self::INVALID_TRACE && $traceId === strtolower($traceId);
}
/**
* @return bool Returns a value that indicates whether a span id is valid
*/
public static function isValidSpanId(string $spanId): bool
{
return ctype_xdigit($spanId) && strlen($spanId) === self::SPAN_LENGTH && $spanId !== self::INVALID_SPAN && $spanId === strtolower($spanId);
}
}
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