use cookie auth in variant service example (#518)

examples/VariantServiceDemo/Pages/Index.cshtml.cs

@@ -1,6 +1,8 @@
-using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Authentication;
+using Microsoft.AspNetCore.Mvc;
 using Microsoft.AspNetCore.Mvc.RazorPages;
 using Microsoft.FeatureManagement;
+using System.Security.Claims;
 
 namespace VariantServiceDemo.Pages
 {
@@ -19,11 +21,22 @@ public IActionResult OnGet()
         {
             //
             // generate a new visitor
-            string visitor = Random.Shared.Next().ToString();
+            Username = Random.Shared.Next().ToString();
 
-            Response.Cookies.Append("username", visitor);
+            // Clear Application Insights cookies and 
+            Response.Cookies.Delete("ai_user");
+            Response.Cookies.Delete("ai_session");
 
-            Username = visitor;
+            // Generate new user claim
+            var claims = new List<Claim>
+            {
+                new Claim(ClaimTypes.Name, Username)
+            };
+
+            var identity = new ClaimsIdentity(claims, "CookieAuth");
+            var principal = new ClaimsPrincipal(identity);
+
+            HttpContext.SignInAsync("CookieAuth", principal);
 
             return Page();
         }

examples/VariantServiceDemo/Program.cs

@@ -1,9 +1,7 @@
 // Copyright (c) Microsoft Corporation.
 // Licensed under the MIT license.
 //
-using Microsoft.ApplicationInsights.Extensibility;
 using Microsoft.FeatureManagement;
-using Microsoft.FeatureManagement.Telemetry.ApplicationInsights;
 using VariantServiceDemo;
 
 var builder = WebApplication.CreateBuilder(args);
@@ -14,14 +12,12 @@
 // Add services to the container.
 builder.Services.AddRazorPages();
 
-builder.Services.AddHttpContextAccessor();
+//
+// Use cookie auth for simplicity and randomizing user
+builder.Services.AddAuthentication("CookieAuth");
 
 builder.Services.AddApplicationInsightsTelemetry();
 
-//
-// App Insights TargetingId Tagging
-builder.Services.AddSingleton<ITelemetryInitializer, TargetingTelemetryInitializer>();
-
 //
 // Add variant implementations of ICalculator
 builder.Services.AddSingleton<ICalculator, DefaultCalculator>();
@@ -35,7 +31,7 @@
 // Including user targeting capability and the variant service provider of ICalculator which is bounded with the variant feature flag "Calculator"
 // Wire up evaluation event emission
 builder.Services.AddFeatureManagement()
-    .WithTargeting<HttpContextTargetingContextAccessor>()
+    .WithTargeting()
     .WithVariantService<ICalculator>("Calculator")
     .AddApplicationInsightsTelemetry();