module Projects class DownloadService < BaseService WHITELIST = [ /^[^.]+\.fogbugz.com$/ ] def initialize(project, url) @project, @url = project, url end def execute return nil unless valid_url?(@url) uploader = FileUploader.new(@project) uploader.download!(@url) uploader.store! filename = uploader.image? ? uploader.file.basename : uploader.file.filename { 'alt' => filename, 'url' => uploader.secure_url, 'is_image' => uploader.image? } end private def valid_url?(url) url && http?(url) && valid_domain?(url) end def http?(url) url =~ /\A#{URI::regexp(['http', 'https'])}\z/ end def valid_domain?(url) host = URI.parse(url).host WHITELIST.any? { |entry| entry === host } end end end