implemented Discord OAuth2

Lieb/Data/AccountController.cs

@@ -0,0 +1,32 @@
+using Microsoft.AspNetCore.Authentication;
+using Microsoft.AspNetCore.Authentication.Cookies;
+using Microsoft.AspNetCore.DataProtection;
+using Microsoft.AspNetCore.Mvc;
+
+namespace Lieb.Data
+{
+    [Route("[controller]/[action]")] // Microsoft.AspNetCore.Mvc.Route
+    public class AccountController : ControllerBase
+    {
+        public IDataProtectionProvider Provider { get; }
+
+        public AccountController(IDataProtectionProvider provider)
+        {
+            Provider = provider;
+        }
+
+        [HttpGet]
+        public IActionResult Login(string returnUrl = "/")
+        {
+            return Challenge(new AuthenticationProperties { RedirectUri = returnUrl }, "Discord");
+        }
+
+        [HttpGet]
+        public async Task<IActionResult> Logout(string returnUrl = "/")
+        {
+            //This removes the cookie assigned to the user login.
+            await HttpContext.SignOutAsync(CookieAuthenticationDefaults.AuthenticationScheme);
+            return LocalRedirect(returnUrl);
+        }
+    }
+}

Lieb/Data/WeatherForecast.cs

@@ -1,13 +0,0 @@
-namespace Lieb.Data
-{
-    public class WeatherForecast
-    {
-        public DateTime Date { get; set; }
-
-        public int TemperatureC { get; set; }
-
-        public int TemperatureF => 32 + (int)(TemperatureC / 0.5556);
-
-        public string? Summary { get; set; }
-    }
-}

Lieb/Data/WeatherForecastService.cs

@@ -1,20 +0,0 @@
-namespace Lieb.Data
-{
-    public class WeatherForecastService
-    {
-        private static readonly string[] Summaries = new[]
-        {
-        "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
-    };
-
-        public Task<WeatherForecast[]> GetForecastAsync(DateTime startDate)
-        {
-            return Task.FromResult(Enumerable.Range(1, 5).Select(index => new WeatherForecast
-            {
-                Date = startDate.AddDays(index),
-                TemperatureC = Random.Shared.Next(-20, 55),
-                Summary = Summaries[Random.Shared.Next(Summaries.Length)]
-            }).ToArray());
-        }
-    }
-}