public static async Task <ClaimsIdentity> GetIdentityFromExternalProvider(this IOwinContext context)
{
if (context == null)
{
throw new ArgumentNullException("context");
}
var id = await context.GetIdentityFromExternalSignIn();
if (id != null)
{
// this is mapping from the external IdP's issuer to the name of the
// katana middleware that's registered in startup
var result = await context.GetAuthenticationFrom(Constants.ExternalAuthenticationType);
if (!result.Properties.Dictionary.Keys.Contains(Constants.Authentication.KatanaAuthenticationType))
{
throw new InvalidOperationException("Missing KatanaAuthenticationType");
}
var provider = result.Properties.Dictionary[Constants.Authentication.KatanaAuthenticationType];
var newClaims = id.Claims.Select(x => new Claim(x.Type, x.Value, x.ValueType, provider));
id = new ClaimsIdentity(newClaims, id.AuthenticationType);
}
return(id);
}