82 lines
2.2 KiB
JavaScript
82 lines
2.2 KiB
JavaScript
import createPackageURL from '../utils/createPackageURL.js';
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import createSearch from '../utils/createSearch.js';
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const leadingSlashes = /^\/*/;
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function filenameRedirect(req, res) {
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let filename;
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if (req.query.module != null) {
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// See https://github.com/rollup/rollup/wiki/pkg.module
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filename = req.packageConfig.module || req.packageConfig['jsnext:main'];
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if (!filename) {
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// https://nodejs.org/api/esm.html#esm_code_package_json_code_code_type_code_field
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if (req.packageConfig.type === 'module') {
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// Use whatever is in pkg.main or index.js
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filename = req.packageConfig.main || '/index.js';
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} else if (
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req.packageConfig.main &&
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/\.mjs$/.test(req.packageConfig.main)
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) {
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// Use .mjs file in pkg.main
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filename = req.packageConfig.main;
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}
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}
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if (!filename) {
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return res
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.status(404)
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.type('text')
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.send(`Package ${req.packageSpec} does not contain an ES module`);
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}
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} else if (
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req.query.main &&
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req.packageConfig[req.query.main] &&
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typeof req.packageConfig[req.query.main] === 'string'
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) {
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// Deprecated, see #63
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filename = req.packageConfig[req.query.main];
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} else if (
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req.packageConfig.unpkg &&
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typeof req.packageConfig.unpkg === 'string'
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) {
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filename = req.packageConfig.unpkg;
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} else if (
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req.packageConfig.browser &&
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typeof req.packageConfig.browser === 'string'
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) {
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// Deprecated, see #63
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filename = req.packageConfig.browser;
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} else {
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filename = req.packageConfig.main || '/index.js';
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}
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// Redirect to the exact filename so relative imports
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// and URLs resolve correctly.
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res
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.set({
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'Cache-Control': 'public, max-age=31536000', // 1 year
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'Cache-Tag': 'redirect, filename-redirect'
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})
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.redirect(
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302,
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createPackageURL(
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req.packageName,
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req.packageVersion,
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filename.replace(leadingSlashes, '/'),
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createSearch(req.query)
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)
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);
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}
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/**
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* Redirect to the exact filename if the request omits one.
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*/
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export default async function validateFilename(req, res, next) {
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if (!req.filename) {
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return filenameRedirect(req, res);
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}
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next();
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}
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