100 lines
2.5 KiB
JavaScript
100 lines
2.5 KiB
JavaScript
const semver = require("semver");
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const createPackageURL = require("../utils/createPackageURL");
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const getPackageInfo = require("../utils/getPackageInfo");
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const getPackage = require("../utils/getPackage");
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function tagRedirect(req, res) {
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// Cache tag redirects for 1 minute.
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res
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.set({
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"Cache-Control": "public, max-age=60",
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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(
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req.packageName,
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req.packageInfo["dist-tags"][req.packageVersion],
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req.filename,
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req.search
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)
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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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// Cache semver redirects for 1 minute.
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res
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.set({
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"Cache-Control": "public, max-age=60",
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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 ${req.packageSpec}`);
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}
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}
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/**
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* Fetch the package metadata and tarball from npm. Redirect to the exact
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* version if the request targets a tag or uses a semver version.
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*/
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function fetchPackage(req, res, next) {
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getPackageInfo(req.packageName, (error, packageInfo) => {
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if (error) {
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console.error(error);
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return res
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.status(500)
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.type("text")
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.send(`Cannot get info for package "${req.packageName}"`);
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}
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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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if (req.packageVersion in req.packageInfo.versions) {
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// A valid request for a package we haven't downloaded yet.
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req.packageConfig = req.packageInfo.versions[req.packageVersion];
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getPackage(req.packageConfig, (error, outputDir) => {
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if (error) {
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console.error(error);
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res
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.status(500)
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.type("text")
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.send(`Cannot fetch package ${req.packageSpec}`);
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} else {
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req.packageDir = outputDir;
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next();
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}
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});
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} else if (req.packageVersion in req.packageInfo["dist-tags"]) {
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tagRedirect(req, res);
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} else {
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semverRedirect(req, res);
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}
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});
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}
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module.exports = fetchPackage;
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