add submission tracking events

lib/submission_events.rb

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+module SubmissionEvents
+  TRACKING_PARAM_LENGTH = 6
+
+  module_function
+
+  def build_tracking_param(submitter, event_type = 'click_email')
+    Base64.urlsafe_encode64(
+      [submitter.slug, event_type, Rails.application.secrets.secret_key_base].join(':')
+    ).first(TRACKING_PARAM_LENGTH)
+  end
+
+  def create_with_tracking_data(submitter, event_type, request)
+    SubmissionEvent.create!(submitter:, event_type:, data: {
+      ip: request.remote_ip,
+      ua: request.user_agent,
+      sid: request.session.id.to_s,
+      uid: request.env['warden'].user(:user)&.id
+    }.compact_blank)
+  end
+end