75 lines
1.6 KiB
JavaScript
75 lines
1.6 KiB
JavaScript
const url = require('url')
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const URLFormat = /^\/((?:@[^\/@]+\/)?[^\/@]+)(?:@([^\/]+))?(\/.*)?$/
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function decodeParam(param) {
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if (param) {
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try {
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return decodeURIComponent(param) : ''
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} catch (error) {
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// Ignore param parsing errors.
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}
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}
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return null
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}
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const ValidQueryKeys = {
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main: true,
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meta: true,
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json: true
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}
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function queryIsValid(query) {
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return Object.keys(query).every(function (key) {
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return ValidQueryKeys[key]
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})
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}
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function parsePackageURL(packageURL) {
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const { pathname, search, query } = url.parse(packageURL, true)
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// Do not allow unrecognized query parameters because
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// some people use them to bust the cache.
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if (!queryIsValid(query))
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return null
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const match = URLFormat.exec(pathname)
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if (match == null)
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return null
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const packageName = match[1]
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const packageVersion = decodeParam(match[2]) || 'latest'
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const filename = decodeParam(match[3])
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return { // If the URL is /@scope/name@version/file.js?main=browser:
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pathname, // /@scope/name@version/path.js
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search, // ?main=browser
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query, // { main: 'browser' }
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packageName, // @scope/name
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packageVersion, // version
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filename // /file.js
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}
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}
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function createPackageURL(packageName, version, filename, search) {
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let pathname = `/${packageName}`
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if (version != null)
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pathname += `@${version}`
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if (filename)
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pathname += filename
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if (search)
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pathname += search
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return pathname
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}
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module.exports = {
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parse: parsePackageURL,
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create: createPackageURL
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}
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