You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: export_controller.rb
    path of file: ./repos/openstreetmap-website/app/controllers
    
    the code of the file until where you have to start completion: class ExportController < ApplicationController
  before_action :authorize_web
  before_action :set_locale
  before_action :up
    
  def finish
    bbox = BoundingBox.from_lon_lat_params(params)
    format = params[:format]

    case format
    when "osm"
      # redirect to API map get
      redirect_to :controller => "api/map", :action => "index", :bbox => bbox

    when "mapnik"
      # redirect to a special 'export' cgi script
      format = params[:mapnik_format]
      scale = params[:mapnik_scale]

      redirect_to "https://render.openstreetmap.org/cgi-bin/export?bbox=#{bbox}&scale=#{scale}&format=#{format}", :allow_other_host => true
    end