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![Tim Neutkens](/assets/img/avatar_default.png)
* Compile pages to .next/static/<buildid>/pages/<page> * Fix test * Export class instead of using exports * Use constant for static directory * Add comment about what the middleware does
262 lines
8 KiB
JavaScript
262 lines
8 KiB
JavaScript
import { join } from 'path'
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import React from 'react'
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import { renderToString, renderToStaticMarkup } from 'react-dom/server'
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import send from 'send'
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import generateETag from 'etag'
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import fresh from 'fresh'
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import requirePage, {normalizePagePath} from './require'
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import { Router } from '../lib/router'
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import { loadGetInitialProps, isResSent } from '../lib/utils'
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import Head, { defaultHead } from '../lib/head'
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import ErrorDebug from '../lib/error-debug'
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import Loadable from 'react-loadable'
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import { BUILD_MANIFEST, REACT_LOADABLE_MANIFEST, SERVER_DIRECTORY, CLIENT_STATIC_FILES_PATH } from '../lib/constants'
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// Based on https://github.com/jamiebuilds/react-loadable/pull/132
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function getDynamicImportBundles (manifest, moduleIds) {
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return moduleIds.reduce((bundles, moduleId) => {
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if (typeof manifest[moduleId] === 'undefined') {
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return bundles
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}
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return bundles.concat(manifest[moduleId])
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}, [])
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}
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const logger = console
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export async function render (req, res, pathname, query, opts) {
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const html = await renderToHTML(req, res, pathname, query, opts)
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sendHTML(req, res, html, req.method, opts)
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}
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export function renderToHTML (req, res, pathname, query, opts) {
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return doRender(req, res, pathname, query, opts)
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}
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export async function renderError (err, req, res, pathname, query, opts) {
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const html = await renderErrorToHTML(err, req, res, query, opts)
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sendHTML(req, res, html, req.method, opts)
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}
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export function renderErrorToHTML (err, req, res, pathname, query, opts = {}) {
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return doRender(req, res, pathname, query, { ...opts, err, page: '/_error' })
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}
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async function doRender (req, res, pathname, query, {
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err,
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page,
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buildId,
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hotReloader,
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assetPrefix,
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runtimeConfig,
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distDir,
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dir,
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dev = false,
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staticMarkup = false,
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nextExport
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} = {}) {
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page = page || pathname
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if (hotReloader) { // In dev mode we use on demand entries to compile the page before rendering
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await ensurePage(page, { dir, hotReloader })
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}
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const documentPath = join(distDir, SERVER_DIRECTORY, CLIENT_STATIC_FILES_PATH, buildId, 'pages', '_document')
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const appPath = join(distDir, SERVER_DIRECTORY, CLIENT_STATIC_FILES_PATH, buildId, 'pages', '_app')
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let [buildManifest, reactLoadableManifest, Component, Document, App] = await Promise.all([
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require(join(distDir, BUILD_MANIFEST)),
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require(join(distDir, REACT_LOADABLE_MANIFEST)),
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requirePage(page, {distDir}),
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require(documentPath),
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require(appPath)
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])
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await Loadable.preloadAll() // Make sure all dynamic imports are loaded
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Component = Component.default || Component
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if (typeof Component !== 'function') {
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throw new Error(`The default export is not a React Component in page: "${pathname}"`)
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}
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App = App.default || App
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Document = Document.default || Document
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const asPath = req.url
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const ctx = { err, req, res, pathname, query, asPath }
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const router = new Router(pathname, query, asPath)
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const props = await loadGetInitialProps(App, {Component, router, ctx})
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const files = [
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...new Set([
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...buildManifest.pages[normalizePagePath(page)],
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...buildManifest.pages[normalizePagePath('/_app')],
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...buildManifest.pages[normalizePagePath('/_error')]
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])
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]
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// the response might be finshed on the getinitialprops call
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if (isResSent(res)) return
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let reactLoadableModules = []
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const renderPage = (options = Page => Page) => {
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let EnhancedApp = App
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let EnhancedComponent = Component
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// For backwards compatibility
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if (typeof options === 'function') {
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EnhancedComponent = options(Component)
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} else if (typeof options === 'object') {
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if (options.enhanceApp) {
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EnhancedApp = options.enhanceApp(App)
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}
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if (options.enhanceComponent) {
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EnhancedComponent = options.enhanceComponent(Component)
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}
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}
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const app = <Loadable.Capture report={moduleName => reactLoadableModules.push(moduleName)}>
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<EnhancedApp {...{
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Component: EnhancedComponent,
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router,
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...props
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}} />
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</Loadable.Capture>
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const render = staticMarkup ? renderToStaticMarkup : renderToString
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let html
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let head
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let errorHtml = ''
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try {
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if (err && dev) {
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errorHtml = render(<ErrorDebug error={err} />)
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} else if (err) {
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html = render(app)
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} else {
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html = render(app)
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}
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} finally {
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head = Head.rewind() || defaultHead()
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}
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return { html, head, errorHtml, buildManifest }
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}
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const docProps = await loadGetInitialProps(Document, { ...ctx, renderPage })
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const dynamicImports = getDynamicImportBundles(reactLoadableManifest, reactLoadableModules)
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if (isResSent(res)) return
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if (!Document.prototype || !Document.prototype.isReactComponent) throw new Error('_document.js is not exporting a React component')
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const doc = <Document {...{
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__NEXT_DATA__: {
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// Used in development to replace paths for react-error-overlay
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distDir: dev ? distDir : undefined,
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props, // The result of getInitialProps
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page, // The rendered page
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pathname, // The requested path
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query, // querystring parsed / passed by the user
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buildId, // buildId is used to facilitate caching of page bundles, we send it to the client so that pageloader knows where to load bundles
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assetPrefix: assetPrefix === '' ? undefined : assetPrefix, // send assetPrefix to the client side when configured, otherwise don't sent in the resulting HTML
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runtimeConfig, // runtimeConfig if provided, otherwise don't sent in the resulting HTML
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nextExport, // If this is a page exported by `next export`
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err: (err) ? serializeError(dev, err) : undefined // Error if one happened, otherwise don't sent in the resulting HTML
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},
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dev,
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dir,
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staticMarkup,
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buildManifest,
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files,
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dynamicImports,
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assetPrefix, // We always pass assetPrefix as a top level property since _document needs it to render, even though the client side might not need it
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...docProps
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}} />
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return '<!DOCTYPE html>' + renderToStaticMarkup(doc)
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}
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export async function renderScriptError (req, res, page, error) {
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// Asks CDNs and others to not to cache the errored page
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res.setHeader('Cache-Control', 'no-cache, no-store, must-revalidate')
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if (error.code === 'ENOENT' || error.message === 'INVALID_BUILD_ID') {
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res.statusCode = 404
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res.end('404 - Not Found')
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return
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}
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logger.error(error.stack)
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res.statusCode = 500
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res.end('500 - Internal Error')
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}
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export function sendHTML (req, res, html, method, { dev, generateEtags }) {
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if (isResSent(res)) return
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const etag = generateEtags && generateETag(html)
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if (fresh(req.headers, { etag })) {
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res.statusCode = 304
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res.end()
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return
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}
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if (dev) {
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// In dev, we should not cache pages for any reason.
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// That's why we do this.
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res.setHeader('Cache-Control', 'no-store, must-revalidate')
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}
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if (etag) {
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res.setHeader('ETag', etag)
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}
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if (!res.getHeader('Content-Type')) {
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res.setHeader('Content-Type', 'text/html; charset=utf-8')
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}
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res.setHeader('Content-Length', Buffer.byteLength(html))
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res.end(method === 'HEAD' ? null : html)
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}
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function errorToJSON (err) {
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const { name, message, stack } = err
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const json = { name, message, stack }
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if (err.module) {
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// rawRequest contains the filename of the module which has the error.
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const { rawRequest } = err.module
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json.module = { rawRequest }
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}
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return json
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}
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function serializeError (dev, err) {
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if (dev) {
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return errorToJSON(err)
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}
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return { message: '500 - Internal Server Error.' }
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}
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export function serveStatic (req, res, path) {
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return new Promise((resolve, reject) => {
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send(req, path)
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.on('directory', () => {
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// We don't allow directories to be read.
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const err = new Error('No directory access')
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err.code = 'ENOENT'
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reject(err)
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})
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.on('error', reject)
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.pipe(res)
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.on('finish', resolve)
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})
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}
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async function ensurePage (page, { dir, hotReloader }) {
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if (page === '/_error') return
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await hotReloader.ensurePage(page)
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}
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