1 files changed, 18 insertions, 1 deletions
diff --git a/lib/banzai/filter/upload_link_filter.rb b/lib/banzai/filter/upload_link_filter.rb
index 2572481c8fc..b110c59a4f1 100644
--- a/lib/banzai/filter/upload_link_filter.rb
+++ b/lib/banzai/filter/upload_link_filter.rb
@@ -45,13 +45,15 @@ module Banzai
           return
         end
 
-        html_attr.value =
+        path =
           if context[:only_path]
             path
           else
             Addressable::URI.join(Gitlab.config.gitlab.base_url, path).to_s
           end
 
+        replace_html_attr_value(html_attr, path)
+
         if html_attr.name == 'href'
           html_attr.parent.set_attribute('data-link', 'true')
         end
@@ -59,6 +61,21 @@ module Banzai
         html_attr.parent.add_class('gfm')
       end
 
+      def replace_html_attr_value(html_attr, path)
+        if path != html_attr.value
+          preserve_original_link(html_attr, html_attr.parent)
+        end
+
+        html_attr.value = path
+      end
+
+      def preserve_original_link(html_attr, node)
+        return if html_attr.blank?
+        return if node.value?('data-canonical-src')
+
+        node.set_attribute('data-canonical-src', html_attr.value)
+      end
+
       def group
         context[:group]
       end