add new tag helpers

TurnstileAttributeTagHelper.cs

@@ -0,0 +1,43 @@
+using Microsoft.AspNetCore.Html;
+using Microsoft.AspNetCore.Mvc.Rendering;
+using Microsoft.AspNetCore.Mvc.ViewFeatures;
+using Microsoft.AspNetCore.Razor.TagHelpers;
+
+namespace TurnstileTag;
+
+[HtmlTargetElement("form", Attributes = "cf-turnstile")]
+public class TurnstileAttributeTagHelper : TagHelper
+{
+  readonly ITurnstile _turnstile;
+
+
+  public TurnstileAttributeTagHelper(ITurnstile turnstile)
+  {
+    _turnstile = turnstile;
+  }
+
+  /// <summary>
+  /// Whether turnstile should be activated.
+  /// </summary>
+  public bool? CfTurnstile { get; set; }
+
+  /// <summary>
+  /// Gets the <see cref="Rendering.ViewContext"/> of the executing view.
+  /// </summary>
+  [HtmlAttributeNotBound]
+  [ViewContext]
+  public ViewContext? ViewContext { get; set; }
+
+
+  public override void Process(TagHelperContext context, TagHelperOutput output)
+  {
+    if (CfTurnstile ?? false)
+    {
+      IHtmlContent content = _turnstile.GenerateTurnstileFormHtml(ViewContext!);
+      if (content != null)
+      {
+        output.PostContent.AppendHtml(content);
+      }
+    }
+  }
+}