Add status references list page

app/controllers/api/v1/statuses/referred_by_statuses_controller.rb

@@ -0,0 +1,67 @@
+# frozen_string_literal: true
+
+class Api::V1::Statuses::ReferredByStatusesController < Api::BaseController
+  include Authorization
+
+  before_action -> { authorize_if_got_token! :read, :'read:accounts' }
+  before_action :set_status
+  after_action :insert_pagination_headers
+
+  def index
+    @statuses = load_statuses
+    render json: @statuses, each_serializer: REST::StatusSerializer, relationships: StatusRelationshipsPresenter.new(@statuses, current_user&.account_id)
+  end
+
+  private
+
+  def load_statuses
+    cached_references
+  end
+
+  def cached_references
+    cache_collection(results, Status)
+  end
+
+  def results
+    @results ||= Status.where(id: @status.referenced_by_status_objects.select(:status_id)).paginate_by_max_id(
+      limit_param(DEFAULT_STATUSES_LIMIT),
+      params[:max_id],
+      params[:since_id]
+    )
+  end
+
+  def insert_pagination_headers
+    set_pagination_headers(next_path, prev_path)
+  end
+
+  def next_path
+    api_v1_status_referred_by_index_url pagination_params(max_id: pagination_max_id) if records_continue?
+  end
+
+  def prev_path
+    api_v1_status_referred_by_index_url pagination_params(min_id: pagination_since_id) unless results.empty?
+  end
+
+  def pagination_max_id
+    results.last.id
+  end
+
+  def pagination_since_id
+    results.first.id
+  end
+
+  def records_continue?
+    results.size == limit_param(DEFAULT_STATUSES_LIMIT)
+  end
+
+  def set_status
+    @status = Status.find(params[:status_id])
+    authorize @status, :show?
+  rescue Mastodon::NotPermittedError
+    not_found
+  end
+
+  def pagination_params(core_params)
+    params.slice(:limit).permit(:limit).merge(core_params)
+  end
+end