More robust language caching

BuildFeed/Code/Options/Locale.cs

@@ -1,4 +1,6 @@
 using System.Globalization;
+using System.Linq;
+using System.Web;
 
 namespace BuildFeed.Code.Options
 {
@@ -39,6 +41,8 @@ public class Locale
          new Locale("zh-hant")
       };
 
+      private const string LANG_COOKIE_NAME = "bf_lang";
+
       public string DisplayName => Info.NativeName;
 
       public CultureInfo Info { get; set; }
@@ -49,5 +53,31 @@ public Locale(string localeId)
          LocaleId = localeId;
          Info = CultureInfo.GetCultureInfo(localeId);
       }
+
+      public static CultureInfo DetectCulture(HttpContextBase context)
+      {
+         string langCookie = context.Request.Cookies[LANG_COOKIE_NAME]?.Value;
+
+         if (!string.IsNullOrEmpty(langCookie))
+         {
+            try
+            {
+               CultureInfo ci = (CultureInfo)CultureInfo.GetCultureInfo(langCookie).Clone();
+
+               // Get Gregorian Calendar in locale if available
+               Calendar gc = ci.OptionalCalendars.FirstOrDefault(c => c is GregorianCalendar && ((GregorianCalendar)c).CalendarType == GregorianCalendarTypes.Localized);
+               if (gc != null)
+               {
+                  ci.DateTimeFormat.Calendar = gc;
+               }
+
+               return ci;
+            }
+
+            catch (CultureNotFoundException) { }
+         }
+
+         return CultureInfo.CurrentCulture;
+      }
    }
 }

BuildFeed/Controllers/BaseController.cs

@@ -9,31 +9,11 @@ namespace BuildFeed.Controllers
 {
    public class BaseController : Controller
    {
-      private const string LANG_COOKIE_NAME = "bf_lang";
-
       protected override void Initialize(RequestContext requestContext)
       {
-         string langCookie = requestContext.HttpContext.Request.Cookies[LANG_COOKIE_NAME]?.Value;
-
-         if (!string.IsNullOrEmpty(langCookie))
-         {
-            try
-            {
-               CultureInfo ci = (CultureInfo)CultureInfo.GetCultureInfo(langCookie).Clone();
-
-               // Get Gregorian Calendar in locale if available
-               Calendar gc = ci.OptionalCalendars.FirstOrDefault(c => c is GregorianCalendar && ((GregorianCalendar)c).CalendarType == GregorianCalendarTypes.Localized);
-               if (gc != null)
-               {
-                  ci.DateTimeFormat.Calendar = gc;
-               }
-
-               CultureInfo.CurrentCulture = ci;
-               CultureInfo.CurrentUICulture = ci;
-            }
-
-            catch (CultureNotFoundException) { }
-         }
+         CultureInfo ci = Locale.DetectCulture(requestContext.HttpContext);
+         CultureInfo.CurrentCulture = ci;
+         CultureInfo.CurrentUICulture = ci;
 
          ViewBag.Theme = new Theme(Theme.DetectTheme(requestContext.HttpContext));
 

BuildFeed/Global.asax.cs

@@ -37,6 +37,7 @@ public override string GetVaryByCustomString(HttpContext context, string custom)
       {
          string[] parts = custom.Split(';');
          List<string> varyParts = new List<string>();
+         HttpContextWrapper contextWrapper = new HttpContextWrapper(context);
 
          foreach (string part in parts)
          {
@@ -46,10 +47,10 @@ public override string GetVaryByCustomString(HttpContext context, string custom)
                   varyParts.Add($"user:{context.User.Identity.Name}");
                   break;
                case "lang":
-                  varyParts.Add($"lang:{CultureInfo.CurrentUICulture.LCID}");
+                  varyParts.Add($"lang:{Locale.DetectCulture(contextWrapper).LCID}");
                   break;
                case "theme":
-                  varyParts.Add($"theme:{Theme.DetectTheme(new HttpContextWrapper(context))}");
+                  varyParts.Add($"theme:{Theme.DetectTheme(contextWrapper)}");
                   break;
             }
          }

BuildFeed/res/ts/bfs.js

@@ -1,3 +1,5 @@
+/// <reference path="../../scripts/typings/google.analytics/ga.d.ts" />
+/// <reference path="../../scripts/typings/jsrender/jsrender.d.ts" />
 var BuildFeed;
 (function (BuildFeed) {
     var ajax;