Extract credentials from basic authentication header.

TryGetBasicAutheticationCredentials.cs

// Although this function works it may not be the best way and has some bug.
bool TryGetBasicAutheticationCredentials(string authorizationHeader, out string username, out string password)
{
    const string schemePrefix = "Basic ";

    if (authorizationHeader != null &&
        authorizationHeader.StartsWith(schemePrefix, System.StringComparison.OrdinalIgnoreCase))
    {
        try
        {
            string authorizationValue = authorizationHeader.Substring(schemePrefix.Length);
            byte[] credentialsBytes = System.Convert.FromBase64String(authorizationValue);
            string credentials = System.Text.Encoding.UTF8.GetString(credentialsBytes);
            string[] tokens = credentials.Split(':');
            username = tokens[0];
            password = tokens[1];
            return true;
        }
        catch
        {
        }
    }

    username = default;
    password = default;
    return false;
}