CmsKit - Normalization of url slug

modules/cms-kit/src/Volo.CmsKit.Domain/Volo/CmsKit/Blogs/BlogPost.cs

@@ -1,5 +1,6 @@
 using JetBrains.Annotations;
 using System;
+using System.Text.RegularExpressions;
 using Volo.Abp;
 using Volo.Abp.Domain.Entities.Auditing;
 using Volo.CmsKit.Blogs;
@@ -45,7 +46,9 @@ namespace Volo.CmsKit.Domain.Volo.CmsKit.Blogs
 
         public void SetUrlSlug(string urlSlug)
         {
-            UrlSlug = Check.NotNullOrWhiteSpace(urlSlug, nameof(urlSlug), BlogPostConsts.MaxUrlSlugLength, BlogPostConsts.MinUrlSlugLength);
+            Check.NotNullOrWhiteSpace(urlSlug, nameof(urlSlug), BlogPostConsts.MaxUrlSlugLength, BlogPostConsts.MinUrlSlugLength);
+
+            UrlSlug = NormalizeUrlSlug(urlSlug);
         }
 
         public void SetIsPublished(bool isPublished)
@@ -57,5 +60,27 @@ namespace Volo.CmsKit.Domain.Volo.CmsKit.Blogs
 
             IsPublished = IsPublished;
         }
+
+        private string NormalizeUrlSlug(string value)
+        {
+            value = value.ToLowerInvariant();
+
+            // TODO: Find best way to unidecode.
+            // value = value.Unidecode(); 
+
+            // Replace spaces
+            value = Regex.Replace(value, @"\s", "-", RegexOptions.Compiled);
+
+            // Remove invalid chars
+            value = Regex.Replace(value, @"[^a-z0-9\s-_]", "", RegexOptions.Compiled);
+
+            // Trim dashes from end & dots
+            value = value.Trim('-', '_', '.');
+
+            // Replace double occurences of - or _
+            value = Regex.Replace(value, @"([-_]){2,}", "$1", RegexOptions.Compiled);
+
+            return value;
+        }
     }
 }