Aggiunta funzionalità multi language

Author: AngeloDotNet

src/NET6CustomLibrary/MultiLanguage/CultureAwareOperationFilter.cs

@@ -0,0 +1,41 @@
+using Microsoft.AspNetCore.Builder;
+using Microsoft.Extensions.Options;
+using Microsoft.Net.Http.Headers;
+using Microsoft.OpenApi.Any;
+using Microsoft.OpenApi.Models;
+using Swashbuckle.AspNetCore.SwaggerGen;
+
+namespace NET6CustomLibrary.MultiLanguage;
+
+public class CultureAwareOperationFilter : IOperationFilter
+{
+    private readonly List<IOpenApiAny> supportedLanguages;
+
+    public CultureAwareOperationFilter(IOptions<RequestLocalizationOptions> requestLocalizationOptions)
+    {
+        supportedLanguages = requestLocalizationOptions.Value
+            .SupportedCultures?.Select(c => new OpenApiString(c.TwoLetterISOLanguageName))
+            .Cast<IOpenApiAny>()
+            .ToList();
+    }
+
+    public void Apply(OpenApiOperation operation, OperationFilterContext context)
+    {
+        if (supportedLanguages.Count > 1)
+        {
+            operation.Parameters ??= new List<OpenApiParameter>();
+            operation.Parameters.Add(new OpenApiParameter
+            {
+                Name = HeaderNames.AcceptLanguage,
+                In = ParameterLocation.Header,
+                Required = false,
+                Schema = new OpenApiSchema
+                {
+                    Type = "String",
+                    Enum = supportedLanguages,
+                    Default = supportedLanguages.First()
+                }
+            });
+        }
+    }
+}