iForm auto (#234)

fundamentals/minimal-apis/samples/IFormFile/Program.cs

@@ -1,3 +1,6 @@
+#define FIRST  // FIRST SECOND
+#if NEVER
+#elif FIRST
 // <snippet_1>
 using Microsoft.AspNetCore.Antiforgery;
 using Microsoft.AspNetCore.Http.HttpResults;
@@ -18,6 +21,42 @@ app.MapGet("/", (HttpContext context, IAntiforgery antiforgery) =>
     return Results.Content(html, "text/html");
 });
 
+app.MapPost("/upload", async Task<Results<Ok<string>, BadRequest<string>>>
+    ([FromForm] FileUploadForm fileUploadForm, HttpContext context,
+                                                IAntiforgery antiforgery) =>
+{
+    await MyUtils.SaveFileWithName(fileUploadForm.FileDocument!,
+              fileUploadForm.Name!, app.Environment.ContentRootPath);
+    return TypedResults.Ok($"Your file with the description:" +
+        $" {fileUploadForm.Description} has been uploaded successfully");
+});
+
+app.Run();
+// </snippet_1>
+
+// The following code shows how to validate the anti-forgery token manually when
+// not using model binding but using Request.ReadFormAsync() to manually read the form.
+#elif SECOND
+// <snippet_2>
+using Microsoft.AspNetCore.Antiforgery;
+using Microsoft.AspNetCore.Http.HttpResults;
+using Microsoft.AspNetCore.Mvc;
+
+var builder = WebApplication.CreateBuilder();
+
+builder.Services.AddAntiforgery();
+
+var app = builder.Build();
+app.UseAntiforgery();
+
+// Generate a form with an anti-forgery token and an /upload endpoint.
+app.MapGet("/", (HttpContext context, IAntiforgery antiforgery) =>
+{
+    var token = antiforgery.GetAndStoreTokens(context);
+    var html = MyUtils.GenerateHtmlForm(token.FormFieldName, token.RequestToken!);
+    return Results.Content(html, "text/html");
+});
+
 app.MapPost("/upload", async Task<Results<Ok<string>,BadRequest<string>>>
     ([FromForm] FileUploadForm fileUploadForm, HttpContext context,
                                                 IAntiforgery antiforgery) =>
@@ -37,7 +76,8 @@ app.MapPost("/upload", async Task<Results<Ok<string>,BadRequest<string>>>
 });
 
 app.Run();
-// </snippet_1>
+// </snippet_2>
+#endif
 
 public class FileUploadForm
 {