62 lines
1.8 KiB
JavaScript
62 lines
1.8 KiB
JavaScript
import gunzip from 'gunzip-maybe';
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import tar from 'tar-stream';
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import bufferStream from '../utils/bufferStream.js';
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import getContentType from '../utils/getContentType.js';
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import getIntegrity from '../utils/getIntegrity.js';
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import { getPackage } from '../utils/npm.js';
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async function findEntry(stream, filename) {
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// filename = /some/file/name.js
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return new Promise((accept, reject) => {
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let foundEntry = null;
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stream
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.pipe(gunzip())
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.pipe(tar.extract())
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.on('error', reject)
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.on('entry', async (header, stream, next) => {
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const entry = {
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// Most packages have header names that look like `package/index.js`
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// so we shorten that to just `/index.js` here. A few packages use a
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// prefix other than `package/`. e.g. the firebase package uses the
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// `firebase_npm/` prefix. So we just strip the first dir name.
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path: header.name.replace(/^[^/]+/, ''),
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type: header.type
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};
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// Ignore non-files and files that don't match the name.
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if (entry.type !== 'file' || entry.path !== filename) {
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stream.resume();
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stream.on('end', next);
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return;
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}
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const content = await bufferStream(stream);
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entry.contentType = getContentType(entry.path);
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entry.integrity = getIntegrity(content);
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entry.lastModified = header.mtime.toUTCString();
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entry.size = content.length;
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foundEntry = entry;
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next();
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})
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.on('finish', () => {
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accept(foundEntry);
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});
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});
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}
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export default async function serveFileMetadata(req, res) {
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const stream = await getPackage(req.packageName, req.packageVersion);
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const entry = await findEntry(stream, req.filename);
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if (!entry) {
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// TODO: 404
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}
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res.send(entry);
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}
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