squash a bunch of commits

Shogi.Sockets/ExampleAnonymousSessionMiddleware.cs

@@ -0,0 +1,39 @@
+namespace Shogi.Api
+{
+  namespace anonymous_session.Middlewares
+  {
+    using Microsoft.AspNetCore.Http;
+    using Microsoft.AspNetCore.Authentication;
+    using System.Security.Claims;
+
+    /// <summary>
+    /// TODO: Use this example in the guest session logic instead of custom claims.
+    /// </summary>
+    public class ExampleAnonymousSessionMiddleware
+    {
+      private readonly RequestDelegate _next;
+
+      public ExampleAnonymousSessionMiddleware(RequestDelegate next)
+      {
+        _next = next;
+      }
+
+      public async System.Threading.Tasks.Task InvokeAsync(HttpContext context)
+      {
+        if (!context.User.Identity.IsAuthenticated)
+        {
+          if (string.IsNullOrEmpty(context.User.FindFirstValue(ClaimTypes.Anonymous)))
+          {
+            var claim = new Claim(ClaimTypes.Anonymous, System.Guid.NewGuid().ToString());
+            context.User.AddIdentity(new ClaimsIdentity(new[] { claim }));
+
+            string scheme = Microsoft.AspNetCore.Authentication.Cookies.CookieAuthenticationDefaults.AuthenticationScheme;
+            await context.SignInAsync(scheme, context.User, new AuthenticationProperties { IsPersistent = false });
+          }
+        }
+
+        await _next(context);
+      }
+    }
+  }
+}