Add base class for api/v1/timelines/* controllers (#27840)

app/controllers/api/v1/timelines/base_controller.rb

@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+class Api::V1::Timelines::BaseController < Api::BaseController
+  after_action :insert_pagination_headers, unless: -> { @statuses.empty? }
+
+  private
+
+  def insert_pagination_headers
+    set_pagination_headers(next_path, prev_path)
+  end
+
+  def pagination_max_id
+    @statuses.last.id
+  end
+
+  def pagination_since_id
+    @statuses.first.id
+  end
+
+  def next_path_params
+    permitted_params.merge(max_id: pagination_max_id)
+  end
+
+  def prev_path_params
+    permitted_params.merge(min_id: pagination_since_id)
+  end
+
+  def permitted_params
+    params
+      .slice(*self.class::PERMITTED_PARAMS)
+      .permit(*self.class::PERMITTED_PARAMS)
+  end
+end