1 files changed, 43 insertions, 0 deletions
diff --git a/lib/banzai/filter/inline_metrics_filter.rb b/lib/banzai/filter/inline_metrics_filter.rb
new file mode 100644
index 00000000000..0120cc37d6f
--- /dev/null
+++ b/lib/banzai/filter/inline_metrics_filter.rb
@@ -0,0 +1,43 @@
+# frozen_string_literal: true
+
+module Banzai
+  module Filter
+    # HTML filter that inserts a placeholder element for each
+    # reference to a metrics dashboard.
+    class InlineMetricsFilter < Banzai::Filter::InlineEmbedsFilter
+      # Placeholder element for the frontend to use as an
+      # injection point for charts.
+      def create_element(params)
+        doc.document.create_element(
+          'div',
+          class: 'js-render-metrics',
+          'data-dashboard-url': metrics_dashboard_url(params)
+        )
+      end
+
+      # Endpoint FE should hit to collect the appropriate
+      # chart information
+      def metrics_dashboard_url(params)
+        Gitlab::Metrics::Dashboard::Url.build_dashboard_url(
+          params['namespace'],
+          params['project'],
+          params['environment'],
+          embedded: true
+        )
+      end
+
+      # Search params for selecting metrics links. A few
+      # simple checks is enough to boost performance without
+      # the cost of doing a full regex match.
+      def xpath_search
+        "descendant-or-self::a[contains(@href,'metrics') and \
+          starts-with(@href, '#{Gitlab.config.gitlab.url}')]"
+      end
+
+      # Regular expression matching metrics urls
+      def link_pattern
+        Gitlab::Metrics::Dashboard::Url.regex
+      end
+    end
+  end
+end