1 files changed, 49 insertions, 0 deletions
diff --git a/app/helpers/breadcrumbs_helper.rb b/app/helpers/breadcrumbs_helper.rb
index b067376cea0..ade7c48b03f 100644
--- a/app/helpers/breadcrumbs_helper.rb
+++ b/app/helpers/breadcrumbs_helper.rb
@@ -32,4 +32,53 @@ module BreadcrumbsHelper
     @breadcrumb_dropdown_links[location] ||= []
     @breadcrumb_dropdown_links[location] << link
   end
+
+  def push_to_schema_breadcrumb(text, link)
+    list_item = schema_list_item(text, link, schema_breadcrumb_list.size + 1)
+
+    schema_breadcrumb_list.push(list_item)
+  end
+
+  def schema_breadcrumb_json
+    {
+      '@context': 'https://schema.org',
+      '@type': 'BreadcrumbList',
+      'itemListElement': build_item_list_elements
+    }.to_json
+  end
+
+  private
+
+  def schema_breadcrumb_list
+    @schema_breadcrumb_list ||= []
+  end
+
+  def build_item_list_elements
+    return @schema_breadcrumb_list unless @breadcrumbs_extra_links&.any?
+
+    last_element = schema_breadcrumb_list.pop
+
+    @breadcrumbs_extra_links.each do |el|
+      push_to_schema_breadcrumb(el[:text], el[:link])
+    end
+
+    last_element['position'] = schema_breadcrumb_list.last['position'] + 1
+    schema_breadcrumb_list.push(last_element)
+  end
+
+  def schema_list_item(text, link, position)
+    {
+      '@type' => 'ListItem',
+      'position' => position,
+      'name' => text,
+      'item' => ensure_absolute_link(link)
+    }
+  end
+
+  def ensure_absolute_link(link)
+    url = URI.parse(link)
+    url.absolute? ? link : URI.join(request.base_url, link).to_s
+  rescue URI::InvalidURIError
+    "#{request.base_url}#{request.path}"
+  end
 end