import url from 'url'; import https from 'https'; import gunzip from 'gunzip-maybe'; import tar from 'tar-stream'; import bufferStream from './bufferStream'; import agent from './registryAgent'; export default function fetchNpmPackage(packageConfig) { return new Promise((resolve, reject) => { const tarballURL = packageConfig.dist.tarball; console.log( 'Fetching package for %s from %s', packageConfig.name, tarballURL ); const { hostname, pathname } = url.parse(tarballURL); const options = { agent: agent, hostname: hostname, path: pathname }; https .get(options, res => { if (res.statusCode === 200) { resolve(res.pipe(gunzip()).pipe(tar.extract())); } else { bufferStream(res).then(data => { const spec = `${packageConfig.name}@${packageConfig.version}`; const content = data.toString('utf-8'); const error = new Error( `Failed to fetch tarball for ${spec}\nstatus: ${ res.statusCode }\ndata: ${content}` ); reject(error); }); } }) .on('error', reject); }); }