CMS-KIT: add link types to links in comments as optional

modules/cms-kit/host/Volo.CmsKit.Web.Unified/Pages/Index.cshtml

@@ -60,7 +60,7 @@
     <abp-column size-md="_12">
         @if (GlobalFeatureManager.Instance.IsEnabled<CommentsFeature>())
         {
-            @await Component.InvokeAsync(typeof(CommentingViewComponent), new {entityType = "quote", entityId = "1"})
+            @await Component.InvokeAsync(typeof(CommentingViewComponent), new {entityType = "quote", entityId = "1", rels  = new [] {"nofollow"}})
         }
     </abp-column>
 </abp-row>

modules/cms-kit/src/Volo.CmsKit.Common.Web/Renderers/IMarkdownToHtmlRenderer.cs

@@ -4,5 +4,5 @@ namespace Volo.CmsKit.Web.Renderers;
 
 public interface IMarkdownToHtmlRenderer
 {
-    Task<string> RenderAsync(string rawMarkdown, bool allowHtmlTags = true, bool preventXSS = true);
+    Task<string> RenderAsync(string rawMarkdown, bool allowHtmlTags = true, bool preventXSS = true, string[] rels = null);
 }

modules/cms-kit/src/Volo.CmsKit.Common.Web/Renderers/MarkdownToHtmlRenderer.cs

@@ -20,7 +20,7 @@ public class MarkdownToHtmlRenderer : IMarkdownToHtmlRenderer, ITransientDepende
         _htmlSanitizer = new HtmlSanitizer();
     }
 
-    public Task<string> RenderAsync(string rawMarkdown, bool allowHtmlTags = true, bool preventXSS = true)
+    public Task<string> RenderAsync(string rawMarkdown, bool allowHtmlTags = true, bool preventXSS = true, string[] rels = null)
     {
         if (!allowHtmlTags)
         {
@@ -33,10 +33,25 @@ public class MarkdownToHtmlRenderer : IMarkdownToHtmlRenderer, ITransientDepende
         {
             html = _htmlSanitizer.Sanitize(html);
         }
+        
+        if(rels != null && rels.Any())
+        {
+            html = AddRelToLinks(html, rels);
+        }
 
         return Task.FromResult(html);
     }
 
+    private string AddRelToLinks(string html, string[] rels)
+    {
+        var rel = string.Join(" ", rels);
+        var regex = new Regex("<a(.*?>)", RegexOptions.IgnoreCase |
+                                          RegexOptions.Singleline |
+                                          RegexOptions.Multiline |
+                                          RegexOptions.Compiled);
+        return regex.Replace(html, $"<a rel=\"{rel}\" $1");
+    }
+
 
     private static List<CodeBlockIndexPair> GetCodeBlockIndices(string markdownText)
     {

modules/cms-kit/src/Volo.CmsKit.Public.Web/Pages/CmsKit/Shared/Components/Commenting/CommentingViewComponent.cs

@@ -59,7 +59,8 @@ public class CommentingViewComponent : AbpViewComponent
 
     public virtual async Task<IViewComponentResult> InvokeAsync(
         string entityType,
-        string entityId)
+        string entityId,
+        IEnumerable<string> rels = null)
     {
         var comments = (await CommentPublicAppService
             .GetListAsync(entityType, entityId)).Items;
@@ -70,6 +71,7 @@ public class CommentingViewComponent : AbpViewComponent
         {
             EntityId = entityId,
             EntityType = entityType,
+            Rels = rels,
             LoginUrl = loginUrl,
             Comments = comments.OrderByDescending(i => i.CreationTime).ToList()
         };
@@ -98,11 +100,12 @@ public class CommentingViewComponent : AbpViewComponent
     private async Task ConvertMarkdownTextsToHtml(CommentingViewModel viewModel)
     {
         viewModel.RawCommentTexts = new Dictionary<Guid, string>();
+        var rels = viewModel.Rels?.ToArray();
 
         foreach (var comment in viewModel.Comments)
         {
             viewModel.RawCommentTexts.Add(comment.Id, comment.Text);
-            comment.Text = await MarkdownToHtmlRenderer.RenderAsync(comment.Text, allowHtmlTags: false, preventXSS: true);
+            comment.Text = await MarkdownToHtmlRenderer.RenderAsync(comment.Text, allowHtmlTags: false, preventXSS: true, rels: rels);
 
             foreach (var reply in comment.Replies)
             {
@@ -117,6 +120,8 @@ public class CommentingViewComponent : AbpViewComponent
         public string EntityType { get; set; }
 
         public string EntityId { get; set; }
+        
+        public IEnumerable<string> Rels { get; set; }
 
         public string LoginUrl { get; set; }