The protection doesn't work integrated with Identity Server

[erossini-chi]

I tried your code and it is working. I wanted to integrate the security with Identity Server and for this reason I changed Startup.cs like that (my folder under wwwroot is called infographics):

public class Startup
{
    public Startup(IConfiguration configuration)
    {
        Configuration = configuration;
    }

    public IConfiguration Configuration { get; }

    // This method gets called by the runtime. Use this method to add services to the container.
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddRazorPages(options => {
            options.Conventions.AuthorizePage("/#");
        });

        services.Configure<IdentityServerConfiguration>(Configuration.GetSection("IdentityServerConfiguration"));

        services.AddDistributedMemoryCache();

        services.AddSession(options =>
        {
            options.Cookie.Name = ".my.Session";
            options.IdleTimeout = TimeSpan.FromHours(12);
        });

        services.AddAuthentication(options =>
        {
            options.DefaultScheme = CookieAuthenticationDefaults.AuthenticationScheme;
            options.DefaultChallengeScheme = "oidc";
        })
        .AddCookie(options =>
        {
            options.ExpireTimeSpan = TimeSpan.FromMinutes(30);
            options.Cookie.Name = "my.dashboard";
        })
        .AddOpenIdConnect("oidc", options =>
        {
            IdentityServerConfiguration idsrv = Configuration.GetSection("IdentityServerConfiguration").Get<IdentityServerConfiguration>();
            options.Authority = idsrv.Url;
            options.ClientId = idsrv.ClientId;
            options.ClientSecret = idsrv.ClientSecret;

            #if DEBUG
            options.RequireHttpsMetadata = false;
            #else
            options.RequireHttpsMetadata = true;
            #endif

            options.ResponseType = "code";

            options.Scope.Clear();
            options.Scope.Add("openid");
            options.Scope.Add("profile");
            options.Scope.Add("email");
            options.Scope.Add("roles");
            options.Scope.Add("offline_access");

            options.ClaimActions.MapJsonKey("role", "role", "role");

            options.GetClaimsFromUserInfoEndpoint = true;
            options.SaveTokens = true;

            options.SignedOutRedirectUri = "/";

            options.TokenValidationParameters = new TokenValidationParameters
            {
                NameClaimType = JwtClaimTypes.Name,
                RoleClaimType = JwtClaimTypes.Role,
            };
        });
    }

    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }
        else
        {
            app.UseExceptionHandler("/Error");
            // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
            app.UseHsts();
        }

        app.UseHttpsRedirection();

        app.UseAuthentication();

        app.UseStaticFiles(new StaticFileOptions
        {
            OnPrepareResponse = ctx =>
            {
                if (ctx.Context.Request.Path.StartsWithSegments("/infographics"))
                {
                    ctx.Context.Response.Headers.Add("Cache-Control", "no-store");

                    if (!ctx.Context.User.Identity.IsAuthenticated)
                    {
                        // respond HTTP 401 Unauthorized with empty body.
                        ctx.Context.Response.StatusCode = (int)HttpStatusCode.Unauthorized;
                        ctx.Context.Response.ContentLength = 0;
                        ctx.Context.Response.Body = Stream.Null;

                        // - or, redirect to another page. -
                        // ctx.Context.Response.Redirect("/");
                    }
                }
            }
        });

        app.UseRouting();

        app.UseAuthorization();

        app.UseEndpoints(endpoints =>
        {
            endpoints.MapRazorPages();
        });
    }
}

I'm using the Login page to redirect the user to the Identity Server login page and then back.

After this changes, everybody can access to the files in the secret folder. Any idea why?
Thank you in advance.

Update

This is working with not HTML files. I think the problem comes from the HTML file because they are static content for ASP.NET.

I put a breakpoint on the OnPrepareResponse and call the page infographics/index.html. The page is displayed (red arrow) and then the application stops on the breakpoint (blue arrow).

[jsakamoto]

@erossini-chi
I have no idea about this problem at this time.
However, I guess it might not be the reason for this problem that the authentication method is OpenID Connect.

My biggest question about this issue is why the browser can gets static contents ("index.html") before "OnPrepareResponse" process it?
I have no answer for this my question at this time.