Added basic authentication and localization

.gitignore

@@ -16,4 +16,5 @@ src/Indexer/Scripts/__pycache__
 src/Indexer/logs
 src/Server/logs
 src/Shared/bin
-src/Shared/obj
+src/Shared/obj
+src/Server/wwwroot/logs/*

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()
     {

src/Server/Models/Auth.cs

@@ -0,0 +1,13 @@
+namespace Server.Models;
+
+public class SimpleAuthOptions
+{
+    public List<SimpleUser> Users { get; set; } = new();
+}
+
+public class SimpleUser
+{
+    public string Username { get; set; } = "";
+    public string Password { get; set; } = "";
+    public string[] Roles { get; set; } = Array.Empty<string>();
+}

src/Server/Program.cs

@@ -1,15 +1,33 @@
 using ElmahCore;
 using ElmahCore.Mvc;
 using Serilog;
+using System.Globalization;
+using Microsoft.AspNetCore.Localization;
 using Server;
 using Server.HealthChecks;
 using Server.Helper;
+using Server.Models;
+using Server.Services;
 
 var builder = WebApplication.CreateBuilder(args);
 
 // Add services to the container.
 
 builder.Services.AddControllersWithViews();
+
+// Add Localization
+builder.Services.AddLocalization(options => options.ResourcesPath = "Resources");
+builder.Services.Configure<RequestLocalizationOptions>(options =>
+{
+    var supportedCultures = new[] { new CultureInfo("en"), new CultureInfo("de") };
+    options.DefaultRequestCulture = new RequestCulture("en");
+    options.SupportedCultures = supportedCultures;
+    options.SupportedUICultures = supportedCultures;
+});
+
+// Add LocalizationService
+builder.Services.AddScoped<LocalizationService>();
+
 // Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
 builder.Services.AddEndpointsApiExplorer();
 builder.Services.AddSwaggerGen();
@@ -30,6 +48,24 @@ builder.Services.AddElmah<XmlFileErrorLog>(Options =>
     Options.LogPath = builder.Configuration.GetValue<string>("Embeddingsearch:Elmah:LogFolder") ?? "~/logs";
 });
 
+builder.Services
+    .AddAuthentication("AppCookie")
+    .AddCookie("AppCookie", options =>
+    {
+        options.LoginPath = "/Account/Login";
+        options.LogoutPath = "/Account/Logout";
+        options.AccessDeniedPath = "/Account/Denied";
+    });
+
+builder.Services.AddAuthorization(options =>
+{
+    options.AddPolicy("AdminOnly",
+        policy => policy.RequireRole("Admin"));
+});
+
+IConfigurationSection simpleAuthSection = builder.Configuration.GetSection("Embeddingsearch:SimpleAuth");
+if (simpleAuthSection.Exists()) builder.Services.Configure<SimpleAuthOptions>(simpleAuthSection);
+
 var app = builder.Build();
 
 List<string>? allowedIps = builder.Configuration.GetSection("Embeddingsearch:Elmah:AllowedHosts")
@@ -77,6 +113,15 @@ if (UseMiddleware == true && !IsDevelopment)
     app.UseMiddleware<Shared.ApiKeyMiddleware>();
 }
 
+// Add localization
+var supportedCultures = new[] { "de", "de-DE", "en-US" };
+var localizationOptions = new RequestLocalizationOptions()
+    .SetDefaultCulture("de")
+    .AddSupportedCultures(supportedCultures)
+    .AddSupportedUICultures(supportedCultures);
+app.UseRequestLocalization(localizationOptions);
+
+app.UseAuthentication();
 app.UseAuthorization();
 
 app.MapControllers();

src/Server/Resources/SharedResources.de.resx

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <data name="LoggedInAs" xml:space="preserve">
+    <value>Angemeldet als</value>
+  </data>
+  <data name="Logout" xml:space="preserve">
+    <value>Abmelden</value>
+  </data>
+  <data name="Login" xml:space="preserve">
+    <value>Anmelden</value>
+  </data>
+  <data name="Username" xml:space="preserve">
+    <value>Benutzername</value>
+  </data>
+  <data name="Password" xml:space="preserve">
+    <value>Passwort</value>
+  </data>
+  <data name="InvalidCredentials" xml:space="preserve">
+    <value>Ungültiger Benutzername oder Passwort.</value>
+  </data>
+</root>

src/Server/Resources/SharedResources.en.resx

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <data name="LoggedInAs" xml:space="preserve">
+    <value>Logged in as</value>
+  </data>
+  <data name="Logout" xml:space="preserve">
+    <value>Log out</value>
+  </data>
+  <data name="Login" xml:space="preserve">
+    <value>Login</value>
+  </data>
+  <data name="Username" xml:space="preserve">
+    <value>Username</value>
+  </data>
+  <data name="Password" xml:space="preserve">
+    <value>Password</value>
+  </data>
+  <data name="InvalidCredentials" xml:space="preserve">
+    <value>Invalid credentials.</value>
+  </data>
+</root>

src/Server/Services/LocalizationService.cs

@@ -0,0 +1,18 @@
+using Microsoft.Extensions.Localization;
+
+namespace Server.Services;
+
+public class LocalizationService
+{
+    private readonly IStringLocalizer _localizer;
+
+    public LocalizationService(IStringLocalizerFactory factory)
+    {
+        _localizer = factory.Create("SharedResources", "Server");
+    }
+
+    public string Get(string key) => _localizer[key];
+
+    public string this[string key] => _localizer[key];
+    public string this[string key, params object[] args] => _localizer[key, args];
+}

src/Server/Views/Account/Login.cshtml

@@ -0,0 +1,28 @@
+@using Server.Services
+@inject LocalizationService T
+@{
+    ViewData["Title"] = "Login";
+    var returnUrl = ViewData["ReturnUrl"] as string;
+}
+
+<div class="text-center">
+    <h1>Login</h1>
+    <form asp-action="Login" method="post" class="mt-4" style="max-width: 400px; margin: auto;">
+        <div class="form-group mb-3">
+            <label for="username" class="form-label">@T["Username"]</label>
+            <input autofocus type="text" class="form-control" id="username" name="username" autocomplete="username" required>
+        </div>
+
+        <div class="form-group mb-3">
+            <label for="password" class="form-label">@T["Password"]</label>
+            <input type="password" class="form-control" id="password" name="password" autocomplete="current-password" required>
+        </div>
+
+        <button type="submit" class="btn btn-primary w-100">@T["Login"]</button>
+
+        @if (!ViewData.ModelState.IsValid)
+        {
+            <p style="color:red">Invalid username or password</p>
+        }
+    </form>
+</div>

src/Server/Views/Shared/_Layout.cshtml

@@ -19,12 +19,21 @@
                 </button>
                 <div class="navbar-collapse collapse d-sm-inline-flex justify-content-between">
                     <ul class="navbar-nav flex-grow-1">
-                        <li class="nav-item">
-                            <a class="nav-link text-dark" asp-area="" asp-controller="Home" asp-action="Index">Home</a>
-                        </li>
-                        <li class="nav-item">
-                            <a class="nav-link text-dark" asp-area="" asp-controller="Home" asp-action="Privacy">Privacy</a>
-                        </li>
+                        @if (User.Identity?.IsAuthenticated == true)
+                        {
+                            <li class="nav-item">
+                                <a class="nav-link text-dark" asp-area="" asp-controller="Home" asp-action="Index">Home</a>
+                            </li>
+                            <li class="nav-item">
+                                <a class="nav-link text-dark" asp-area="" asp-controller="Account" asp-action="Logout">Logout</a>
+                            </li>
+                        }
+                        else
+                        {
+                            <li class="nav-item">
+                                <a class="nav-link text-dark" asp-area="" asp-controller="Account" asp-action="Login">Login</a>
+                            </li>
+                        }
                     </ul>
                 </div>
             </div>