const got = require('got'); class FileDownloader { constructor() { } async load(url, callback) { const maxDownloadSize = 10*1024*1024; let errMes = ''; const response = await got(url, {method: 'HEAD'}); let estSize = 100000; if (response.headers['content-length']) { estSize = response.headers['content-length']; } const request = got(url, {encoding: null}).on('downloadProgress', progress => { if (progress.transferred > maxDownloadSize) { errMes = 'file too big'; request.cancel(); } const prog = Math.round(progress.transferred/estSize*100); if (callback) callback((prog > 100 ? 100 : prog)); if (prog > 100) estSize *= 1.5; }); try { return (await request).body; } catch (error) { errMes = (errMes ? errMes : error.message); throw new Error(errMes); } } } module.exports = FileDownloader;