137 lines
3.6 KiB
JavaScript
137 lines
3.6 KiB
JavaScript
import semver from 'semver';
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import addLeadingSlash from '../utils/addLeadingSlash';
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import createPackageURL from '../utils/createPackageURL';
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import createSearch from '../utils/createSearch';
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import getNpmPackageInfo from '../utils/getNpmPackageInfo';
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function tagRedirect(req, res) {
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const version = req.packageInfo['dist-tags'][req.packageVersion];
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res
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.set({
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'Cache-Control': 'public, s-maxage=60, max-age=3600', // 1 minute at the CDN, 1 hour on clients
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'Cache-Tag': 'redirect, tag-redirect'
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})
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.redirect(
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302,
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createPackageURL(req.packageName, version, req.filename, req.search)
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);
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}
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function semverRedirect(req, res) {
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const maxVersion = semver.maxSatisfying(
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Object.keys(req.packageInfo.versions),
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req.packageVersion
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);
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if (maxVersion) {
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res
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.set({
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'Cache-Control': 'public, s-maxage=60, max-age=3600', // 1 minute at the CDN, 1 hour on clients
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'Cache-Tag': 'redirect, semver-redirect'
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})
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.redirect(
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302,
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createPackageURL(req.packageName, maxVersion, req.filename, req.search)
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);
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} else {
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res
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.status(404)
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.type('text')
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.send(`Cannot find package ${req.packageSpec}`);
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}
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}
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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 =
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req.packageConfig.module ||
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req.packageConfig['jsnext:main'] ||
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'/index.js';
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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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addLeadingSlash(filename),
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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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* Fetch the package metadata and tarball from npm. Redirect to the exact
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* version if the request targets a tag or uses a semver version, or to the
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* exact filename if the request omits the filename.
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*/
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export default function fetchPackage(req, res, next) {
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getNpmPackageInfo(req.packageName).then(
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packageInfo => {
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if (packageInfo == null || packageInfo.versions == null) {
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return res
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.status(404)
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.type('text')
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.send(`Cannot find package "${req.packageName}"`);
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}
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req.packageInfo = packageInfo;
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req.packageConfig = req.packageInfo.versions[req.packageVersion];
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if (!req.packageConfig) {
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// Redirect to a fully-resolved version.
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if (req.packageVersion in req.packageInfo['dist-tags']) {
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return tagRedirect(req, res);
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} else {
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return semverRedirect(req, res);
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}
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}
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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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error => {
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console.error(error);
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return res
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.status(500)
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.type('text')
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.send(`Cannot get info for package "${req.packageName}"`);
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}
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);
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}
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