internal static void ValidateSubprotocol()

in src/Microsoft.Azure.Relay/WebSockets/WebSocketValidate.cs [50:82]

29 lines of code
7 McCabe index (conditional complexity)


        internal static void ValidateSubprotocol(string subProtocol)
        {
            if (string.IsNullOrWhiteSpace(subProtocol))
            {
                throw new ArgumentException(SR.net_WebSockets_InvalidEmptySubProtocol, nameof(subProtocol));
            }

            string invalidChar = null;
            int i = 0;
            while (i < subProtocol.Length)
            {
                char ch = subProtocol[i];
                if (ch < 0x21 || ch > 0x7e)
                {
                    invalidChar = string.Format(CultureInfo.InvariantCulture, "[{0}]", (int)ch);
                    break;
                }

                if (!char.IsLetterOrDigit(ch) &&
                    Separators.IndexOf(ch) >= 0)
                {
                    invalidChar = ch.ToString();
                    break;
                }

                i++;
            }

            if (invalidChar != null)
            {
                throw new ArgumentException(SR.Format(SR.net_WebSockets_InvalidCharInProtocolString, subProtocol, invalidChar), nameof(subProtocol));
            }
        }