TDEAL-4: CookieCultureScopeMiddleware and GetUrlHelper

Lombiq.HelpfulLibraries.OrchardCore/Contents/ContentOrchardHelperExtensions.cs

@@ -87,11 +87,15 @@ public static string Action<TController>(
         where TController : ControllerBase =>
         orchardHelper.HttpContext.Action(taskActionExpression.StripResult(), additionalArguments);
 
-    private static IUrlHelper GetUrlHelper(this IOrchardHelper orchardHelper)
+    /// <summary>
+    /// Constructs a new <see cref="IUrlHelper"/> instance using the current <see cref="IOrchardHelper.HttpContext"/>.
+    /// </summary>
+    public static IUrlHelper GetUrlHelper(this IOrchardHelper orchardHelper)
     {
         var serviceProvider = orchardHelper.HttpContext.RequestServices;
         var urlHelperFactory = serviceProvider.GetService<IUrlHelperFactory>();
-        var actionContext = serviceProvider.GetService<IActionContextAccessor>()?.ActionContext;
+        var actionContext = serviceProvider.GetService<IActionContextAccessor>()?.ActionContext ??
+            throw new InvalidOperationException("Couldn't access the action context.");
 
         return urlHelperFactory.GetUrlHelper(actionContext);
     }

Lombiq.HelpfulLibraries.OrchardCore/Contents/ContentTypeDefinitionBuilderExtensions.cs

@@ -1,3 +1,4 @@
+using Lombiq.HelpfulLibraries.OrchardCore.Contents;
 using OrchardCore.Autoroute.Models;
 using OrchardCore.ContentManagement.Metadata.Settings;
 using OrchardCore.Title.Models;
@@ -66,4 +67,11 @@ public static ContentTypeDefinitionBuilder WithContentTypeAutoroute(
                     AllowUpdatePath = true,
                     ManageContainedItemRoutes = true,
                 }));
+
+    /// <summary>
+    /// Sets the type's <see cref="ContentTypeSettings.Stereotype"/> to <see cref="CommonStereotypes.Widget"/>.
+    /// accordingly.
+    /// </summary>
+    public static ContentTypeDefinitionBuilder AsWidget(this ContentTypeDefinitionBuilder builder) =>
+        builder.Stereotype(CommonStereotypes.Widget);
 }

Lombiq.HelpfulLibraries.OrchardCore/Middlewares/CookieCultureScopeMiddleware.cs

@@ -0,0 +1,61 @@
+using Microsoft.AspNetCore.Http;
+using Microsoft.Extensions.DependencyInjection;
+using OrchardCore.Localization;
+using System.Globalization;
+using System.Threading.Tasks;
+
+namespace Lombiq.HelpfulLibraries.OrchardCore.Middlewares;
+
+/// <summary>
+/// A middleware that looks for the "culture" query string argument or cookie and uses it to initialize a <see
+/// cref="CultureScope"/>.
+/// </summary>
+public class CookieCultureScopeMiddleware
+{
+    public const string CultureKeyName = "culture";
+
+    private readonly RequestDelegate _next;
+
+    public CookieCultureScopeMiddleware(RequestDelegate next) => _next = next;
+
+    public async Task InvokeAsync(HttpContext context)
+    {
+        if (!TryGetCultureInfo(context, out var culture))
+        {
+            culture = await context
+                .RequestServices
+                .GetRequiredService<ILocalizationService>()
+                .GetDefaultCultureAsync() ?? "en-US";
+        }
+
+        using var scope = CultureScope.Create(culture, culture, ignoreSystemSettings: true);
+        context.SetCookieForever(CultureKeyName, culture);
+
+        await _next(context);
+    }
+
+    private static bool TryGetCultureInfo(HttpContext context, out string culture)
+    {
+        if (context.Request.Query.TryGetValue(CultureKeyName, out var queryCulture))
+        {
+            culture = queryCulture[0];
+        }
+        else
+        {
+            context.Request.Cookies.TryGetValue(CultureKeyName, out culture);
+        }
+
+        if (string.IsNullOrWhiteSpace(culture)) return false;
+
+        try
+        {
+            culture = new CultureInfo(culture).Name;
+            return true;
+        }
+        catch
+        {
+            culture = null;
+            return false;
+        }
+    }
+}