mirror of
https://github.com/terribleplan/next.js.git
synced 2024-01-19 02:48:18 +00:00
261 lines
7 KiB
JavaScript
261 lines
7 KiB
JavaScript
import { join } from 'path'
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import { existsSync } from 'fs'
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import { createElement } 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 requireModule from './require'
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import getConfig from './config'
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import resolvePath from './resolve'
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import { Router } from '../lib/router'
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import { loadGetInitialProps } from '../lib/utils'
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import Head, { defaultHead } from '../lib/head'
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import App from '../lib/app'
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import ErrorDebug from '../lib/error-debug'
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import { flushChunks } from '../lib/dynamic'
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import xssFilters from 'xss-filters'
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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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buildStats,
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hotReloader,
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assetPrefix,
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availableChunks,
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dir = process.cwd(),
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dev = false,
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staticMarkup = false,
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nextExport = false
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} = {}) {
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page = page || pathname
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await ensurePage(page, { dir, hotReloader })
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const dist = getConfig(dir).distDir
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let [Component, Document] = await Promise.all([
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requireModule(join(dir, dist, 'dist', 'pages', page)),
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requireModule(join(dir, dist, 'dist', 'pages', '_document'))
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])
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Component = Component.default || Component
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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 props = await loadGetInitialProps(Component, ctx)
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// the response might be finshed on the getinitialprops call
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if (res.finished) return
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const renderPage = (enhancer = Page => Page) => {
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const app = createElement(App, {
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Component: enhancer(Component),
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props,
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router: new Router(pathname, query)
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})
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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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html = render(app)
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} finally {
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head = Head.rewind() || defaultHead()
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}
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const chunks = loadChunks({ dev, dir, dist, availableChunks })
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if (err && dev) {
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errorHtml = render(createElement(ErrorDebug, { error: err }))
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}
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return { html, head, errorHtml, chunks }
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}
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const docProps = await loadGetInitialProps(Document, { ...ctx, renderPage })
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// While developing, we should not cache any assets.
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// So, we use a different buildId for each page load.
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// With that we can ensure, we have unique URL for assets per every page load.
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// So, it'll prevent issues like this: https://git.io/vHLtb
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const devBuildId = Date.now()
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if (res.finished) return
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if (!Document.prototype || !Document.prototype.isReactComponent) throw new Error('_document.js is not exporting a React element')
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const doc = createElement(Document, {
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__NEXT_DATA__: {
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props,
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pathname,
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query,
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buildId: dev ? devBuildId : buildId,
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buildStats,
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assetPrefix,
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nextExport,
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err: (err) ? serializeError(dev, err) : null
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},
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dev,
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dir,
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staticMarkup,
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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 renderScript (req, res, page, opts) {
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try {
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const dist = getConfig(opts.dir).distDir
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const path = join(opts.dir, dist, 'bundles', 'pages', page)
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const realPath = await resolvePath(path)
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await serveStatic(req, res, realPath)
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} catch (err) {
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if (err.code === 'ENOENT') {
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renderScriptError(req, res, page, err, {}, opts)
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return
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}
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throw err
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}
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}
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export async function renderScriptError (req, res, page, error, customFields, { dev }) {
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// Asks CDNs and others to not to cache the errored page
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res.setHeader('Cache-Control', 'no-store, must-revalidate')
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// prevent XSS attacks by filtering the page before printing it.
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page = xssFilters.uriInSingleQuotedAttr(page)
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res.setHeader('Content-Type', 'text/javascript')
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if (error.code === 'ENOENT') {
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res.end(`
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window.__NEXT_REGISTER_PAGE('${page}', function() {
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var error = new Error('Page does not exist: ${page}')
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error.statusCode = 404
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return { error: error }
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})
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`)
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return
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}
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const errorJson = {
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...serializeError(dev, error),
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...customFields
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}
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res.end(`
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window.__NEXT_REGISTER_PAGE('${page}', function() {
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var error = ${JSON.stringify(errorJson)}
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return { error: error }
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})
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`)
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}
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export function sendHTML (req, res, html, method, { dev }) {
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if (res.finished) return
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const etag = 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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res.setHeader('ETag', etag)
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res.setHeader('Content-Type', 'text/html')
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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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export function sendJSON (res, obj, method) {
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if (res.finished) return
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const json = JSON.stringify(obj)
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res.setHeader('Content-Type', 'application/json')
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res.setHeader('Content-Length', Buffer.byteLength(json))
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res.end(method === 'HEAD' ? null : json)
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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 (!hotReloader) return
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if (page === '_error' || page === '_document') return
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await hotReloader.ensurePage(page)
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}
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function loadChunks ({ dev, dir, dist, availableChunks }) {
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const flushedChunks = flushChunks()
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const validChunks = []
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for (var chunk of flushedChunks) {
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const filename = join(dir, dist, 'chunks', chunk)
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const exists = dev ? existsSync(filename) : availableChunks[chunk]
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if (exists) {
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validChunks.push(chunk)
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}
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}
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return validChunks
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}
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