implemented Discord OAuth2

Lieb/Program.cs

@@ -1,4 +1,6 @@
+using Discord.OAuth2;
 using Lieb.Data;
+using Microsoft.AspNetCore.Authentication.Cookies;
 using Microsoft.AspNetCore.Components;
 using Microsoft.AspNetCore.Components.Web;
 
@@ -7,7 +9,20 @@ var builder = WebApplication.CreateBuilder(args);
 // Add services to the container.
 builder.Services.AddRazorPages();
 builder.Services.AddServerSideBlazor();
-builder.Services.AddSingleton<WeatherForecastService>();
+builder.Services.AddAuthentication(opt =>
+{
+    opt.DefaultScheme = CookieAuthenticationDefaults.AuthenticationScheme;
+    opt.DefaultSignInScheme = CookieAuthenticationDefaults.AuthenticationScheme;
+    opt.DefaultChallengeScheme = DiscordDefaults.AuthenticationScheme;
+})
+    .AddCookie()
+    .AddDiscord(x =>
+    {
+        x.AppId = builder.Configuration["Discord:AppId"];
+        x.AppSecret = builder.Configuration["Discord:AppSecret"];
+
+        x.SaveTokens = true;
+    });
 
 var app = builder.Build();
 
@@ -19,11 +34,18 @@ if (!app.Environment.IsDevelopment())
     app.UseHsts();
 }
 
+
 app.UseHttpsRedirection();
 
 app.UseStaticFiles();
 
 app.UseRouting();
+app.UseAuthentication();
+
+app.UseEndpoints(endpoints =>
+{
+    endpoints.MapDefaultControllerRoute();
+});
 
 app.MapBlazorHub();
 app.MapFallbackToPage("/_Host");