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next.js/packages/next-server/server/render.js

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import { join } from 'path'
import React from 'react'
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import { renderToString, renderToStaticMarkup } from 'react-dom/server'
import send from 'send'
import generateETag from 'etag'
import fresh from 'fresh'
import requirePage, {normalizePagePath} from './require'
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'
import ErrorDebug from '../lib/error-debug'
import Loadable from '../lib/loadable'
import LoadableCapture from '../lib/loadable-capture'
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import { BUILD_MANIFEST, REACT_LOADABLE_MANIFEST, SERVER_DIRECTORY, CLIENT_STATIC_FILES_PATH } from 'next-server/constants'
// Based on https://github.com/jamiebuilds/react-loadable/pull/132
function getDynamicImportBundles (manifest, moduleIds) {
return moduleIds.reduce((bundles, moduleId) => {
if (typeof manifest[moduleId] === 'undefined') {
return bundles
}
return bundles.concat(manifest[moduleId])
}, [])
}
const logger = console
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// since send doesn't support wasm yet
send.mime.define({ 'application/wasm': ['wasm'] })
export async function render (req, res, pathname, query, opts) {
const html = await renderToHTML(req, res, pathname, query, opts)
sendHTML(req, res, html, req.method, opts)
}
export function renderToHTML (req, res, pathname, query, opts) {
return doRender(req, res, pathname, query, opts)
}
export async function renderError (err, req, res, pathname, query, opts) {
const html = await renderErrorToHTML(err, req, res, query, opts)
sendHTML(req, res, html, req.method, opts)
}
export function renderErrorToHTML (err, req, res, pathname, query, opts = {}) {
return doRender(req, res, pathname, query, { ...opts, err, page: '/_error' })
}
function getPageFiles (buildManifest, page) {
const normalizedPage = normalizePagePath(page)
const files = buildManifest.pages[normalizedPage]
if (!files) {
console.warn(`Could not find files for ${normalizedPage} in .next/build-manifest.json`)
return []
}
return files
}
async function doRender (req, res, pathname, query, {
err,
page,
buildId,
hotReloader,
assetPrefix,
runtimeConfig,
distDir,
dir,
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dev = false,
staticMarkup = false,
nextExport
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} = {}) {
page = page || pathname
// In dev mode we use on demand entries to compile the page before rendering
if (hotReloader) {
await hotReloader.ensurePage(page)
}
const documentPath = join(distDir, SERVER_DIRECTORY, CLIENT_STATIC_FILES_PATH, buildId, 'pages', '_document')
const appPath = join(distDir, SERVER_DIRECTORY, CLIENT_STATIC_FILES_PATH, buildId, 'pages', '_app')
let [buildManifest, reactLoadableManifest, Component, Document, App] = await Promise.all([
require(join(distDir, BUILD_MANIFEST)),
require(join(distDir, REACT_LOADABLE_MANIFEST)),
requirePage(page, {distDir}),
require(documentPath),
require(appPath)
])
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Component = Component.default || Component
if (typeof Component !== 'function') {
throw new Error(`The default export is not a React Component in page: "${pathname}"`)
}
App = App.default || App
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Document = Document.default || Document
const asPath = req.url
const ctx = { err, req, res, pathname, query, asPath }
const router = new Router(pathname, query, asPath)
const props = await loadGetInitialProps(App, {Component, router, ctx})
const devFiles = buildManifest.devFiles
const files = [
...new Set([
...getPageFiles(buildManifest, page),
...getPageFiles(buildManifest, '/_app'),
...getPageFiles(buildManifest, '/_error')
])
]
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// the response might be finshed on the getinitialprops call
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if (isResSent(res)) return
let reactLoadableModules = []
const renderPage = (options = Page => Page) => {
let EnhancedApp = App
let EnhancedComponent = Component
// For backwards compatibility
if (typeof options === 'function') {
EnhancedComponent = options(Component)
} else if (typeof options === 'object') {
if (options.enhanceApp) {
EnhancedApp = options.enhanceApp(App)
}
if (options.enhanceComponent) {
EnhancedComponent = options.enhanceComponent(Component)
}
}
const app = <LoadableCapture report={moduleName => reactLoadableModules.push(moduleName)}>
<EnhancedApp {...{
Component: EnhancedComponent,
router,
...props
}} />
</LoadableCapture>
const render = staticMarkup ? renderToStaticMarkup : renderToString
let html
let head
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try {
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if (err && dev) {
html = render(<ErrorDebug error={err} />)
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} else if (err) {
html = render(app)
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} else {
html = render(app)
}
} finally {
head = Head.rewind() || defaultHead()
}
return { html, head, buildManifest }
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}
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await Loadable.preloadAll() // Make sure all dynamic imports are loaded
const docProps = await loadGetInitialProps(Document, { ...ctx, renderPage })
const dynamicImports = [...(new Set(getDynamicImportBundles(reactLoadableManifest, reactLoadableModules)))]
const dynamicImportsIds = dynamicImports.map((bundle) => bundle.id)
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if (isResSent(res)) return
if (!Document.prototype || !Document.prototype.isReactComponent) throw new Error('_document.js is not exporting a React component')
const doc = <Document {...{
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__NEXT_DATA__: {
props, // The result of getInitialProps
page, // The rendered page
pathname, // The requested path
query, // querystring parsed / passed by the user
buildId, // buildId is used to facilitate caching of page bundles, we send it to the client so that pageloader knows where to load bundles
assetPrefix: assetPrefix === '' ? undefined : assetPrefix, // send assetPrefix to the client side when configured, otherwise don't sent in the resulting HTML
runtimeConfig, // runtimeConfig if provided, otherwise don't sent in the resulting HTML
nextExport, // If this is a page exported by `next export`
dynamicIds: dynamicImportsIds.length === 0 ? undefined : dynamicImportsIds,
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,
dir,
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staticMarkup,
buildManifest,
devFiles,
files,
dynamicImports,
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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return '<!DOCTYPE html>' + renderToStaticMarkup(doc)
}
export async function renderScriptError (req, res, page, error) {
// Asks CDNs and others to not to cache the errored page
res.setHeader('Cache-Control', 'no-cache, no-store, max-age=0, must-revalidate')
if (error.code === 'ENOENT' || error.message === 'INVALID_BUILD_ID') {
res.statusCode = 404
res.end('404 - Not Found')
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return
}
logger.error(error.stack)
res.statusCode = 500
res.end('500 - Internal Error')
}
export function sendHTML (req, res, html, method, { dev, generateEtags }) {
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if (isResSent(res)) return
const etag = generateEtags && generateETag(html)
if (fresh(req.headers, { etag })) {
res.statusCode = 304
res.end()
return
}
if (dev) {
// In dev, we should not cache pages for any reason.
// That's why we do this.
res.setHeader('Cache-Control', 'no-store, must-revalidate')
}
if (etag) {
res.setHeader('ETag', etag)
}
if (!res.getHeader('Content-Type')) {
res.setHeader('Content-Type', 'text/html; charset=utf-8')
}
res.setHeader('Content-Length', Buffer.byteLength(html))
res.end(method === 'HEAD' ? null : html)
}
function errorToJSON (err) {
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const { name, message, stack } = err
const json = { name, message, stack }
if (err.module) {
// rawRequest contains the filename of the module which has the error.
const { rawRequest } = err.module
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json.module = { rawRequest }
}
return json
}
function serializeError (dev, err) {
if (dev) {
return errorToJSON(err)
}
return { message: '500 - Internal Server Error.' }
}
export function serveStatic (req, res, path) {
return new Promise((resolve, reject) => {
send(req, path)
.on('directory', () => {
// We don't allow directories to be read.
const err = new Error('No directory access')
err.code = 'ENOENT'
reject(err)
})
.on('error', reject)
.pipe(res)
.on('finish', resolve)
})
}