FEATURE: download user posts archive

app/controllers/export_csv_controller.rb

@@ -0,0 +1,32 @@
+class ExportCsvController < ApplicationController
+
+  skip_before_filter :check_xhr, only: [:show]
+
+  def export_entity
+    params.require(:entity)
+    params.require(:entity_type)
+    if params[:entity_type] == "admin"
+      guardian.ensure_can_export_admin_entity!(current_user)
+    end
+
+    Jobs.enqueue(:export_csv_file, entity: params[:entity], user_id: current_user.id)
+    render json: success_json
+  end
+
+  # download
+  def show
+    params.require(:entity)
+    params.require(:file_id)
+    if params[:entity] == "system"
+      guardian.ensure_can_export_admin_entity!(current_user)
+    end
+
+    filename = params.fetch(:file_id)
+    if export_csv_path = ExportCsv.get_download_path(filename)
+      send_file export_csv_path
+    else
+      render nothing: true, status: 404
+    end
+  end
+
+end