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next.js/server/require.js

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import {join, parse, normalize, sep} from 'path'
import fs from 'mz/fs'
export function pageNotFoundError (page) {
const err = new Error(`Cannot find module for page: ${page}`)
err.code = 'ENOENT'
return err
}
export function normalizePagePath (page) {
// If the page is `/` we need to append `/index`, otherwise the returned directory root will be bundles instead of pages
if (page === '/') {
page = '/index'
}
// Resolve on anything that doesn't start with `/`
if (page[0] !== '/') {
page = `/${page}`
}
// Windows compatibility
if (sep !== '/') {
page = page.replace(/\//g, sep)
}
// Throw when using ../ etc in the pathname
const resolvedPage = normalize(page)
if (page !== resolvedPage) {
throw new Error('Requested and resolved page mismatch')
}
return page
}
export function getPagePath (page, {dir, dist}) {
const pageBundlesPath = join(dir, dist, 'dist', 'bundles', 'pages')
try {
page = normalizePagePath(page)
} catch (err) {
console.error(err)
throw pageNotFoundError(page)
}
const pagePath = join(pageBundlesPath, page) // Path to the page that is to be loaded
// Don't allow wandering outside of the bundles directory
const pathDir = parse(pagePath).dir
if (pathDir.indexOf(pageBundlesPath) !== 0) {
console.error('Resolved page path goes outside of bundles path')
throw pageNotFoundError(page)
}
return pagePath
}
export default async function requirePage (page, {dir, dist}) {
const pagePath = getPagePath(page, {dir, dist}) + '.js'
const fileExists = await fs.exists(pagePath)
if (!fileExists) {
throw pageNotFoundError(page)
}
return require(pagePath)
}