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PrivaPub/Services/RequestLocalizationOptionsService.cs

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+using Microsoft.AspNetCore.Localization;
+
+using PrivaPub.StaticServices;
+
+using System.Globalization;
+
+namespace PrivaPub.Services
+{
+	public class RequestLocalizationOptionsService
+	{
+		RequestLocalizationOptions RequestLocalizationOptions { get; set; }
+		readonly AppConfigurationService AppConfigurationService;
+
+		public RequestLocalizationOptionsService(AppConfigurationService appConfigurationService)
+		{
+			AppConfigurationService = appConfigurationService;
+		}
+
+		public async Task<RequestLocalizationOptions> Get()
+		{
+			if (RequestLocalizationOptions != default) return RequestLocalizationOptions;
+			if (AppConfigurationService.AppConfiguration == default)
+				await AppConfigurationService.Init();
+
+			RequestLocalizationOptions = new RequestLocalizationOptions();
+			var cultures = AppConfigurationService
+										.AppConfiguration
+										.SupportedLanguages
+										.Select(sl => new CultureInfo(sl))
+										.ToArray();
+			RequestLocalizationOptions.DefaultRequestCulture = new(cultures.First(), cultures.First());
+			RequestLocalizationOptions.SupportedCultures = cultures;
+			RequestLocalizationOptions.SupportedUICultures = cultures;
+			RequestLocalizationOptions.RequestCultureProviders = new IRequestCultureProvider[] {
+						new AcceptLanguageHeaderRequestCultureProvider { Options = RequestLocalizationOptions }
+					};
+			RequestLocalizationOptions.ApplyCurrentCultureToResponseHeaders = true;
+
+			return RequestLocalizationOptions;
+		}
+	}
+}