86 lines
2.1 KiB
JavaScript
86 lines
2.1 KiB
JavaScript
const validateNpmPackageName = require("validate-npm-package-name");
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const parsePackageURL = require("../utils/parsePackageURL");
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const createSearch = require("./utils/createSearch");
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const KnownQueryParams = {
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main: true,
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meta: true,
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module: true
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};
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function isKnownQueryParam(param) {
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return !!KnownQueryParams[param];
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}
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function queryIsKnown(query) {
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return Object.keys(query).every(isKnownQueryParam);
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}
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function sanitizeQuery(query) {
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const saneQuery = {};
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Object.keys(query).forEach(param => {
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if (isKnownQueryParam(param)) saneQuery[param] = query[param];
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});
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return saneQuery;
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}
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/**
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* Parse and validate the URL.
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*/
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function parseURL(req, res, next) {
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// Redirect /_meta/path to /path?meta.
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if (req.path.match(/^\/_meta\//)) {
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req.query.meta = "";
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return res.redirect(302, req.path.substr(6) + createSearch(req.query));
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}
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// Redirect /path?json => /path?meta
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if (req.query.json != null) {
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delete req.query.json;
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req.query.meta = "";
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return res.redirect(302, req.path + createSearch(req.query));
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}
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// Redirect requests with unknown query params to their equivalents
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// with only known params so they can be served from the cache. This
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// prevents people using random query params designed to bust the cache.
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if (!queryIsKnown(req.query)) {
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return res.redirect(302, req.path + createSearch(sanitizeQuery(req.query)));
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}
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const url = parsePackageURL(req.url);
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// Disallow invalid URLs.
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if (url == null) {
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return res
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.status(403)
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.type("text")
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.send(`Invalid URL: ${req.url}`);
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}
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const nameErrors = validateNpmPackageName(url.packageName).errors;
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// Disallow invalid package names.
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if (nameErrors) {
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const reason = nameErrors.join(", ");
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return res
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.status(403)
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.type("text")
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.send(`Invalid package name "${url.packageName}" (${reason})`);
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}
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req.packageName = url.packageName;
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req.packageVersion = url.packageVersion;
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req.packageSpec = `${url.packageName}@${url.packageVersion}`;
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req.pathname = url.pathname;
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req.filename = url.filename;
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req.search = url.search;
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req.query = url.query;
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next();
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}
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module.exports = parseURL;
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