Transforming Open Id Connect claims in ASP.Net Core

Question

I\'m writing an ASP.Net Core Web Application and using UseOpenIdConnectAuthentication to connect it to IdentityServer3. Emulating their ASP.Net MVC 5 sample I\'

Answer 1

You can implement OnSigningIn event of SignInScheme. Here is an example:

        app.UseCookieAuthentication(new CookieAuthenticationOptions()
        {
            AuthenticationScheme = "OpenIdCookies",
            AutomaticAuthenticate = true,
            Events = new CookieAuthenticationEvents()
            {
                OnSigningIn = async (context) =>
                {
                    ClaimsIdentity identity = (ClaimsIdentity)context.Principal.Identity;
                    identity.Claims = identity.Claims.Where(...);
                }
            }
        });

        var oidcOptions = new OpenIdConnectOptions
        {
            AuthenticationScheme = "oidc",
            SignInScheme = "OpenIdCookies"
        };

        //.. set other options

        app.UseOpenIdConnectAuthentication(oidcOptions);