binding.cs

public UserTokenBinding(IServiceProvider serviceProvider)
{
    _readTokenService = serviceProvider.GetService<IReadTokenService>();
    _configuration = serviceProvider.GetService<IConfiguration>();
}

public Task<IValueProvider> BindAsync(BindingContext context)
{
    var headers = context.BindingData["Headers"] as IDictionary<string, string>;
    var issuerToken = _configuration["JwtIssuer"];
    if (!headers.ContainsKey("Authorization"))
        return Task.FromResult<IValueProvider>(new UserTokenValueProvider(string.Empty, issuerToken, _readTokenService));
    var userTokenGroups = Regex.Match(headers["Authorization"], @"^Bearer (\S+)$").Groups;
    var userToken = userTokenGroups.ElementAt(1).Value;
    return Task.FromResult<IValueProvider>(new UserTokenValueProvider(userToken, issuerToken, _readTokenService));
}

public ParameterDescriptor ToParameterDescriptor()
{
    return new ParameterDescriptor();
}