unpkg/modules/actions/serveFileBrowser.js

85 lines
2.4 KiB
JavaScript
Raw Normal View History

import gunzip from 'gunzip-maybe';
import tar from 'tar-stream';
import bufferStream from '../utils/bufferStream.js';
import createDataURI from '../utils/createDataURI.js';
import getContentType from '../utils/getContentType.js';
import getIntegrity from '../utils/getIntegrity.js';
import { getPackage } from '../utils/npm.js';
import getHighlights from '../utils/getHighlights.js';
import getLanguageName from '../utils/getLanguageName.js';
import serveBrowsePage from './serveBrowsePage.js';
async function findEntry(stream, filename) {
// filename = /some/file/name.js
return new Promise((accept, reject) => {
let foundEntry = null;
stream
.pipe(gunzip())
.pipe(tar.extract())
.on('error', reject)
.on('entry', async (header, stream, next) => {
const entry = {
// Most packages have header names that look like `package/index.js`
// so we shorten that to just `/index.js` here. A few packages use a
// prefix other than `package/`. e.g. the firebase package uses the
// `firebase_npm/` prefix. So we just strip the first dir name.
path: header.name.replace(/^[^/]+/, ''),
type: header.type
};
// Ignore non-files and files that don't match the name.
if (entry.type !== 'file' || entry.path !== filename) {
stream.resume();
stream.on('end', next);
return;
}
entry.content = await bufferStream(stream);
foundEntry = entry;
next();
})
.on('finish', () => {
accept(foundEntry);
});
});
}
export default async function serveFileBrowser(req, res) {
const stream = await getPackage(req.packageName, req.packageVersion);
const entry = await findEntry(stream, req.filename);
if (!entry) {
return res.status(404).send(`Not found: ${req.packageSpec}${req.filename}`);
}
const details = {
contentType: getContentType(entry.path),
integrity: getIntegrity(entry.content),
language: getLanguageName(entry.path),
size: entry.content.length
};
if (/^image\//.test(details.contentType)) {
details.uri = createDataURI(details.contentType, entry.content);
details.highlights = null;
} else {
details.uri = null;
details.highlights = getHighlights(
entry.content.toString('utf8'),
entry.path
);
}
req.browseTarget = {
path: req.filename,
type: 'file',
details
};
serveBrowsePage(req, res);
}