public async Task Invoke(IDictionary <string, object> env)
{
// use Katana OWIN abstractions (optional)
var context = new OwinContext(env);
if (context.Authentication != null &&
context.Authentication.User != null)
{
var transformedPrincipal = await _options.ClaimsTransformation(context.Authentication.User);
context.Authentication.User = new ClaimsPrincipal(transformedPrincipal);
}
await _next(env);
}
