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}" (${reason})`)
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}
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req.packageName = url.packageName
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req.packageVersion = url.packageVersion
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req.packageSpec = `${req.packageName}@${req.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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