Nuxt/lib/core/renderer.js

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import path from 'path'
import crypto from 'crypto'
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import serialize from 'serialize-javascript'
import serveStatic from 'serve-static'
import compression from 'compression'
import _ from 'lodash'
import fs from 'fs-extra'
import { createBundleRenderer } from 'vue-server-renderer'
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import connect from 'connect'
import launchMiddleware from 'launch-editor-middleware'
import consola from 'consola'
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import { isUrl, waitFor, timeout } from '../common/utils'
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import defaults from '../common/nuxt.config'
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import MetaRenderer from './meta'
import errorMiddleware from './middleware/error'
import nuxtMiddleware from './middleware/nuxt'
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let jsdom = null
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export default class Renderer {
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constructor(nuxt) {
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this.nuxt = nuxt
this.options = nuxt.options
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// Will be set by createRenderer
this.bundleRenderer = null
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this.metaRenderer = null
// Will be available on dev
this.webpackDevMiddleware = null
this.webpackHotMiddleware = null
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// Create new connect instance
this.app = connect()
// Renderer runtime resources
this.resources = {
clientManifest: null,
serverBundle: null,
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ssrTemplate: null,
spaTemplate: null,
errorTemplate: parseTemplate('Nuxt.js Internal Server Error')
}
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}
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async ready() {
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await this.nuxt.callHook('render:before', this, this.options.render)
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// Setup nuxt middleware
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await this.setupMiddleware()
// Production: Load SSR resources from fs
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if (!this.options.dev) {
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await this.loadResources()
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}
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// Call done hook
await this.nuxt.callHook('render:done', this)
}
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async loadResources(_fs = fs) {
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let distPath = path.resolve(this.options.buildDir, 'dist')
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let updated = []
resourceMap.forEach(({ key, fileName, transform }) => {
let rawKey = '$$' + key
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const _path = path.join(distPath, fileName)
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let rawData, data
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if (!_fs.existsSync(_path)) {
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return // Resource not exists
}
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rawData = _fs.readFileSync(_path, 'utf8')
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if (!rawData || rawData === this.resources[rawKey]) {
return // No changes
}
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this.resources[rawKey] = rawData
data = transform(rawData)
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/* istanbul ignore if */
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if (!data) {
return // Invalid data ?
}
this.resources[key] = data
updated.push(key)
})
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// Reload error template
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const errorTemplatePath = path.resolve(this.options.buildDir, 'views/error.html')
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if (fs.existsSync(errorTemplatePath)) {
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this.resources.errorTemplate = parseTemplate(
fs.readFileSync(errorTemplatePath, 'utf8')
)
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}
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// Load loading template
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const loadingHTMLPath = path.resolve(this.options.buildDir, 'loading.html')
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if (fs.existsSync(loadingHTMLPath)) {
this.resources.loadingHTML = fs.readFileSync(loadingHTMLPath, 'utf8')
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this.resources.loadingHTML = this.resources.loadingHTML
.replace(/\r|\n|[\t\s]{3,}/g, '')
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} else {
this.resources.loadingHTML = ''
}
// Call resourcesLoaded plugin
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await this.nuxt.callHook('render:resourcesLoaded', this.resources)
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if (updated.length > 0) {
this.createRenderer()
}
}
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get noSSR() {
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return this.options.render.ssr === false
}
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get isReady() {
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if (this.noSSR) {
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return Boolean(this.resources.spaTemplate)
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}
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return Boolean(this.bundleRenderer && this.resources.ssrTemplate)
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}
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get isResourcesAvailable() {
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// Required for both
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/* istanbul ignore if */
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if (!this.resources.clientManifest) {
return false
}
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// Required for SPA rendering
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if (this.noSSR) {
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return Boolean(this.resources.spaTemplate)
}
// Required for bundle renderer
return Boolean(this.resources.ssrTemplate && this.resources.serverBundle)
}
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createRenderer() {
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// Ensure resources are available
if (!this.isResourcesAvailable) {
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return
}
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// Create Meta Renderer
this.metaRenderer = new MetaRenderer(this.nuxt, this)
// Skip following steps if noSSR mode
if (this.noSSR) {
return
}
// Create bundle renderer for SSR
this.bundleRenderer = createBundleRenderer(
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this.resources.serverBundle,
Object.assign(
{
clientManifest: this.resources.clientManifest,
runInNewContext: false,
basedir: this.options.rootDir
},
this.options.render.bundleRenderer
)
)
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}
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useMiddleware(m) {
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// Resolve
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const $m = m
let src
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if (typeof m === 'string') {
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m = this.nuxt.requireModule(m)
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}
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if (typeof m.handler === 'string') {
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m.handler = this.nuxt.requireModule(m.handler)
}
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const handler = m.handler || m
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const path = (
(m.prefix !== false ? this.options.router.base : '') +
(typeof m.path === 'string' ? m.path : '')
).replace(/\/\//g, '/')
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// Inject $src and $m to final handler
if (src) handler.$src = src
handler.$m = $m
// Use middleware
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this.app.use(path, handler)
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}
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get publicPath() {
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return isUrl(this.options.build.publicPath)
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? defaults.build.publicPath
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: this.options.build.publicPath
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}
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async setupMiddleware() {
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// Apply setupMiddleware from modules first
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await this.nuxt.callHook('render:setupMiddleware', this.app)
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// Gzip middleware for production
if (!this.options.dev && this.options.render.gzip) {
this.useMiddleware(compression(this.options.render.gzip))
}
// Common URL checks
this.useMiddleware((req, res, next) => {
// Prevent access to SSR resources
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if (ssrResourceRegex.test(req.url)) {
res.statusCode = 404
return res.end()
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}
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next()
})
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// Add webpack middleware only for development
if (this.options.dev) {
this.useMiddleware(async (req, res, next) => {
if (this.webpackDevMiddleware) {
await this.webpackDevMiddleware(req, res)
}
if (this.webpackHotMiddleware) {
await this.webpackHotMiddleware(req, res)
}
next()
})
}
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// open in editor for debug mode only
if (this.options.debug && this.options.dev) {
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this.useMiddleware({
path: '__open-in-editor',
handler: launchMiddleware(this.options.editor)
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})
}
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// For serving static/ files to /
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const staticMiddleware = serveStatic(
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path.resolve(this.options.srcDir, this.options.dir.static),
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this.options.render.static
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)
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staticMiddleware.prefix = this.options.render.static.prefix
this.useMiddleware(staticMiddleware)
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// Serve .nuxt/dist/ files only for production
// For dev they will be served with devMiddleware
if (!this.options.dev) {
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const distDir = path.resolve(this.options.buildDir, 'dist')
this.useMiddleware({
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path: this.publicPath,
handler: serveStatic(distDir, {
index: false, // Don't serve index.html template
maxAge: '1y' // 1 year in production
})
})
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}
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// Add User provided middleware
this.options.serverMiddleware.forEach(m => {
this.useMiddleware(m)
})
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// Finally use nuxtMiddleware
this.useMiddleware(nuxtMiddleware.bind(this))
// Error middleware for errors that occurred in middleware that declared above
// Middleware should exactly take 4 arguments
// https://github.com/senchalabs/connect#error-middleware
// Apply errorMiddleware from modules first
await this.nuxt.callHook('render:errorMiddleware', this.app)
// Apply errorMiddleware from Nuxt
this.useMiddleware(errorMiddleware.bind(this))
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}
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async renderRoute(url, context = {}) {
/* istanbul ignore if */
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if (!this.isReady) {
await waitFor(1000)
return this.renderRoute(url, context)
}
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// Log rendered url
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consola.debug(`Rendering url ${url}`)
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// Add url and isSever to the context
context.url = url
// Basic response if SSR is disabled or spa data provided
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const spa = context.spa || (context.res && context.res.spa)
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const ENV = this.options.env
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if (this.noSSR || spa) {
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const {
HTML_ATTRS,
BODY_ATTRS,
HEAD,
BODY_SCRIPTS,
getPreloadFiles
} = await this.metaRenderer.render(context)
const APP =
`<div id="__nuxt">${this.resources.loadingHTML}</div>` + BODY_SCRIPTS
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// Detect 404 errors
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if (
url.includes(this.options.build.publicPath) ||
url.includes('__webpack')
) {
const err = {
statusCode: 404,
message: this.options.messages.error_404,
name: 'ResourceNotFound'
}
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throw err
}
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const html = this.resources.spaTemplate({
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HTML_ATTRS,
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BODY_ATTRS,
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HEAD,
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APP,
ENV
})
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return { html, getPreloadFiles }
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}
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// Call renderToString from the bundleRenderer and generate the HTML (will update the context as well)
let APP = await this.bundleRenderer.renderToString(context)
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if (!context.nuxt.serverRendered) {
APP = '<div id="__nuxt"></div>'
}
const m = context.meta.inject()
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let HEAD =
m.meta.text() +
m.title.text() +
m.link.text() +
m.style.text() +
m.script.text() +
m.noscript.text()
if (this.options._routerBaseSpecified) {
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HEAD += `<base href="${this.options.router.base}">`
}
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if (this.options.render.resourceHints) {
HEAD += context.renderResourceHints()
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}
await this.nuxt.callHook('render:context', context.nuxt)
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const serializedSession = `window.__NUXT__=${serialize(context.nuxt, {
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isJSON: true
})};`
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const cspScriptSrcHashes = []
if (this.options.render.csp && this.options.render.csp.enabled) {
let hash = crypto.createHash(this.options.render.csp.hashAlgorithm)
hash.update(serializedSession)
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cspScriptSrcHashes.push(
`'${this.options.render.csp.hashAlgorithm}-${hash.digest('base64')}'`
)
}
APP += `<script>${serializedSession}</script>`
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APP += context.renderScripts()
APP += m.script.text({ body: true })
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APP += m.noscript.text({ body: true })
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// TODO: vue-ssr need to handle https://github.com/vuejs/vue/issues/7897
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HEAD += context.renderStyles()
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let html = this.resources.ssrTemplate({
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HTML_ATTRS: 'data-n-head-ssr ' + m.htmlAttrs.text(),
BODY_ATTRS: m.bodyAttrs.text(),
HEAD,
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APP,
ENV
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})
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return {
html,
cspScriptSrcHashes,
getPreloadFiles: context.getPreloadFiles,
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error: context.nuxt.error,
redirected: context.redirected
}
}
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async renderAndGetWindow(url, opts = {}) {
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/* istanbul ignore if */
if (!jsdom) {
try {
jsdom = require('jsdom')
} catch (e) /* istanbul ignore next */ {
consola.error(`
Fail when calling nuxt.renderAndGetWindow(url)
jsdom module is not installed
Please install jsdom with: npm install --save-dev jsdom
`)
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throw e
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}
}
let options = {
resources: 'usable', // load subresources (https://github.com/tmpvar/jsdom#loading-subresources)
runScripts: 'dangerously',
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beforeParse(window) {
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// Mock window.scrollTo
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window.scrollTo = () => {}
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}
}
const jsdomErrHandler = err => { throw err }
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if (opts.virtualConsole !== false) {
options.virtualConsole = new jsdom.VirtualConsole().sendTo(consola)
// throw error when window creation failed
options.virtualConsole.on('jsdomError', jsdomErrHandler)
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}
url = url || 'http://localhost:3000'
const { window } = await jsdom.JSDOM.fromURL(url, options)
// If Nuxt could not be loaded (error from the server-side)
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const nuxtExists = window.document.body.innerHTML.includes(
this.options.render.ssr ? 'window.__NUXT__' : '<div id="__nuxt">'
)
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/* istanbul ignore if */
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if (!nuxtExists) {
let error = new Error('Could not load the nuxt app')
error.body = window.document.body.innerHTML
throw error
}
// Used by nuxt.js to say when the components are loaded and the app ready
await timeout(new Promise(resolve => {
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window._onNuxtLoaded = () => resolve(window)
}), 20000, 'Components loading in renderAndGetWindow was not completed in 20s')
if (opts.virtualConsole !== false) {
// after window initialized successfully
options.virtualConsole.removeListener('jsdomError', jsdomErrHandler)
}
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// Send back window object
return window
}
}
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const parseTemplate = templateStr =>
_.template(templateStr, {
interpolate: /{{([\s\S]+?)}}/g
})
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export const resourceMap = [
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{
key: 'clientManifest',
fileName: 'vue-ssr-client-manifest.json',
transform: JSON.parse
},
{
key: 'serverBundle',
fileName: 'server-bundle.json',
transform: JSON.parse
},
{
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key: 'ssrTemplate',
fileName: 'index.ssr.html',
transform: parseTemplate
},
{
key: 'spaTemplate',
fileName: 'index.spa.html',
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transform: parseTemplate
}
]
// Protector utility against request to SSR bundle files
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const ssrResourceRegex = new RegExp(
resourceMap.map(resource => resource.fileName).join('|'),
'i'
)