47 lines
1.2 KiB
JavaScript
47 lines
1.2 KiB
JavaScript
const got = require('got');
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const maxDownloadSize = 50*1024*1024;
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class FileDownloader {
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constructor() {
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}
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async load(url, callback) {
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let errMes = '';
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const response = await got(url, {method: 'HEAD'});
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let estSize = 0;
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if (response.headers['content-length']) {
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estSize = response.headers['content-length'];
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}
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let prevProg = 0;
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const request = got(url, {encoding: null}).on('downloadProgress', progress => {
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if (progress.transferred > maxDownloadSize) {
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errMes = 'file too big';
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request.cancel();
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}
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let prog = 0;
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if (estSize)
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prog = Math.round(progress.transferred/estSize*100);
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else if (progress.transferred)
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prog = Math.round(progress.transferred/(progress.transferred + 200000)*100);
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if (prog != prevProg && callback)
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callback(prog);
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prevProg = prog;
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});
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try {
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return (await request).body;
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} catch (error) {
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errMes = (errMes ? errMes : error.message);
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throw new Error(errMes);
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}
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}
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}
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module.exports = FileDownloader; |