Added basic authentication and localization

src/Server/Controllers/AccountController.cs

@@ -0,0 +1,65 @@
+using System.Security.Claims;
+using Microsoft.AspNetCore.Authentication;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.Options;
+using Server.Models;
+
+namespace Server.Controllers;
+
+[Route("[Controller]")]
+public class AccountController : Controller
+{
+    private readonly SimpleAuthOptions _options;
+
+    public AccountController(IOptions<SimpleAuthOptions> options)
+    {
+        _options = options.Value;
+    }
+
+    [HttpGet("Login")]
+    public IActionResult Login(string? returnUrl = null)
+    {
+        ViewData["ReturnUrl"] = returnUrl;
+        return View();
+    }
+
+    [HttpPost("Login")]
+    public async Task<IActionResult> Login(
+        string username,
+        string password,
+        string? returnUrl = null)
+    {
+        var user = _options.Users.SingleOrDefault(u =>
+            u.Username == username && u.Password == password);
+
+        if (user == null)
+        {
+            ModelState.AddModelError("", "Invalid credentials");
+            return View();
+        }
+
+        var claims = new List<Claim>
+        {
+            new(ClaimTypes.Name, user.Username)
+        };
+
+        claims.AddRange(user.Roles.Select(r =>
+            new Claim(ClaimTypes.Role, r)));
+
+        var identity = new ClaimsIdentity(
+            claims, "AppCookie");
+
+        await HttpContext.SignInAsync(
+            "AppCookie",
+            new ClaimsPrincipal(identity));
+
+        return Redirect(returnUrl ?? "/");
+    }
+
+    [HttpGet("Logout")]
+    public async Task<IActionResult> Logout()
+    {
+        await HttpContext.SignOutAsync("AppCookie");
+        return RedirectToAction("Login");
+    }
+}

src/Server/Controllers/Frontend/HomeController.cs

@@ -16,6 +16,7 @@ public class HomeController : Controller
         _logger = logger;
     }
 
+    [Authorize]
     [HttpGet("/")]
     public IActionResult Index()
     {