jaeger-client -> opentelemetry

vendor/open-telemetry/api/Trace/Propagation/TraceContextValidator.php

@@ -0,0 +1,31 @@
+<?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;
+    }
+}