mirror of
https://github.com/nuxt/nuxt.git
synced 2024-11-11 16:43:55 +00:00
547 lines
16 KiB
JavaScript
547 lines
16 KiB
JavaScript
import ansiHTML from 'ansi-html'
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import serialize from 'serialize-javascript'
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import generateETag from 'etag'
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import fresh from 'fresh'
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import Tapable from 'tappable'
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import pify from 'pify'
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import serveStatic from 'serve-static'
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import compression from 'compression'
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import _ from 'lodash'
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import { join, resolve } from 'path'
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import fs from 'fs-extra'
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import { createBundleRenderer } from 'vue-server-renderer'
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import { getContext, setAnsiColors, isUrl } from 'utils'
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import Debug from 'debug'
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import Youch from '@nuxtjs/youch'
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import { SourceMapConsumer } from 'source-map'
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import connect from 'connect'
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import { Options } from 'common'
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const debug = Debug('nuxt:render')
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debug.color = 4 // Force blue color
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setAnsiColors(ansiHTML)
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let jsdom = null
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export default class Renderer extends Tapable {
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constructor (nuxt) {
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super()
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this.nuxt = nuxt
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this.options = nuxt.options
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// Will be set by createRenderer
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this.bundleRenderer = null
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// Will be available on dev
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this.webpackDevMiddleware = null
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this.webpackHotMiddleware = null
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// Create new connect instance
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this.app = connect()
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// Renderer runtime resources
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this.resources = {
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clientManifest: null,
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serverBundle: null,
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ssrTemplate: null,
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spaTemplate: null,
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errorTemplate: parseTemplate('Nuxt.js Internal Server Error')
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}
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}
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async _ready () {
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await this.nuxt.applyPluginsAsync('renderer', this)
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// Setup nuxt middleware
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await this.setupMiddleware()
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// 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 ready plugin
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await this.applyPluginsAsync('ready', this)
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}
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async loadResources (_fs = fs) {
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let distPath = resolve(this.options.buildDir, 'dist')
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let updated = []
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resourceMap.forEach(({ key, fileName, transform }) => {
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let rawKey = '$$' + key
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const 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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}
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rawData = _fs.readFileSync(path, 'utf8')
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if (!rawData || rawData === this.resources[rawKey]) {
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return // No changes
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}
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this.resources[rawKey] = rawData
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data = transform(rawData)
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/* istanbul ignore if */
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if (!data) {
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return // Invalid data ?
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}
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this.resources[key] = data
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updated.push(key)
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})
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// Reload error template
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const errorTemplatePath = 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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if (updated.length > 0) {
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// debug('Updated', updated.join(', '), isServer)
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this.createRenderer()
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}
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}
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get noSSR () {
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return this.options.render.ssr === false
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}
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get staticSSR () {
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return this.options.render.ssr === 'static'
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}
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get isReady () {
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if (this.noSSR) {
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return this.resources.spaTemplate
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}
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return this.bundleRenderer && this.resources.ssrTemplate
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}
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createRenderer () {
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// Skip if SSR is disabled
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if (this.noSSR) {
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return
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}
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// If resources are not yet provided
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if (!this.resources.serverBundle || !this.resources.clientManifest) {
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return
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}
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// Create bundle renderer for SSR
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this.bundleRenderer = createBundleRenderer(this.resources.serverBundle, Object.assign({
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clientManifest: this.resources.clientManifest,
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runInNewContext: false,
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basedir: this.options.rootDir
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}, this.options.render.bundleRenderer))
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// Promisify renderToString
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this.bundleRenderer.renderToString = pify(this.bundleRenderer.renderToString)
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}
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useMiddleware (m) {
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// Resolve
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if (typeof m === 'string') {
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m = require(this.nuxt.resolvePath(m))
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}
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// Use middleware
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if (m instanceof Function) {
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this.app.use(m)
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} else if (m && m.path && m.handler) {
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this.app.use(m.path, m.handler)
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}
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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.applyPluginsAsync('setupMiddleware', this.app)
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// Gzip middleware for production
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if (!this.options.dev && this.options.render.gzip) {
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this.useMiddleware(compression(this.options.render.gzip))
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}
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// Common URL checks
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this.useMiddleware((req, res, next) => {
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// If base in req.url, remove it for the middleware and vue-router
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if (this.options.router.base !== '/' && req.url.indexOf(this.options.router.base) === 0) {
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req.url = req.url.replace(this.options.router.base, '/')
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}
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// Prevent access to SSR resources
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if (ssrResourceRegex.test(req.url)) {
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res.statusCode = 404
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return res.end()
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}
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next()
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})
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// Add webpack middleware only for development
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if (this.options.dev) {
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this.useMiddleware(async (req, res, next) => {
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if (this.webpackDevMiddleware) {
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await this.webpackDevMiddleware(req, res)
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}
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if (this.webpackHotMiddleware) {
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await this.webpackHotMiddleware(req, res)
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}
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next()
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})
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}
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// For serving static/ files to /
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this.useMiddleware(serveStatic(resolve(this.options.srcDir, 'static'), this.options.render.static))
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// Serve .nuxt/dist/ files only for production
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// For dev they will be served with devMiddleware
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if (!this.options.dev) {
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const distDir = resolve(this.options.buildDir, 'dist')
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this.useMiddleware({
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path: isUrl(this.options.build.publicPath) ? Options.defaults.build.publicPath : this.options.build.publicPath,
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handler: serveStatic(distDir, {
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index: false, // Don't serve index.html template
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maxAge: (this.options.dev ? 0 : '1y') // 1 year in production
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})
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})
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}
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// Add User provided middleware
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this.options.serverMiddleware.forEach(m => {
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this.useMiddleware(m)
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})
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// Finally use nuxtMiddleware
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this.useMiddleware(this.nuxtMiddleware.bind(this))
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// Error middleware for errors that occurred in middleware that declared above
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// Middleware should exactly take 4 arguments
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// https://github.com/senchalabs/connect#error-middleware
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this.useMiddleware(this.errorMiddleware.bind(this))
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}
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async nuxtMiddleware (req, res, next) {
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// Get context
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const context = getContext(req, res)
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res.statusCode = 200
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try {
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const { html, error, redirected, resourceHints } = await this.renderRoute(req.url, context)
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if (redirected) {
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return html
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}
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if (error) {
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res.statusCode = context.nuxt.error.statusCode || 500
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}
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// Add ETag header
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if (!error && this.options.render.etag) {
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const etag = generateETag(html, this.options.render.etag)
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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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res.setHeader('ETag', etag)
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}
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// HTTP2 push headers
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if (!error && this.options.render.http2.push) {
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// Parse resourceHints to extract HTTP.2 prefetch/push headers
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// https://w3c.github.io/preload/#server-push-http-2
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const regex = /link rel="([^"]*)" href="([^"]*)" as="([^"]*)"/g
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const pushAssets = []
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let m
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while (m = regex.exec(resourceHints)) { // eslint-disable-line no-cond-assign
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const [_, rel, href, as] = m // eslint-disable-line no-unused-vars
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if (rel === 'preload') {
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pushAssets.push(`<${href}>; rel=${rel}; as=${as}`)
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}
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}
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// Pass with single Link header
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// https://blog.cloudflare.com/http-2-server-push-with-multiple-assets-per-link-header
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res.setHeader('Link', pushAssets.join(','))
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}
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// Send response
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res.setHeader('Content-Type', 'text/html; charset=utf-8')
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res.setHeader('Content-Length', Buffer.byteLength(html))
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res.end(html, 'utf8')
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return html
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} catch (err) {
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/* istanbul ignore if */
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if (context && context.redirected) {
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console.error(err) // eslint-disable-line no-console
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return err
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}
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next(err)
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}
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}
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errorMiddleware (err, req, res, next) {
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// ensure statusCode, message and name fields
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err.statusCode = err.statusCode || 500
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err.message = err.message || 'Nuxt Server Error'
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err.name = (!err.name || err.name === 'Error') ? 'Nuxt Server Error' : err.name
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const sendResponse = (content, type = 'text/html') => {
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// Set Headers
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res.statusCode = err.statusCode
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res.statusMessage = err.name
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res.setHeader('Content-Type', type + '; charset=utf-8')
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res.setHeader('Content-Length', Buffer.byteLength(content))
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// Send Response
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res.end(content, 'utf-8')
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}
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// Check if request accepts JSON
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const hasReqHeader = (header, includes) => req.headers[header] && req.headers[header].toLowerCase().includes(includes)
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const isJson = hasReqHeader('accept', 'application/json') || hasReqHeader('user-agent', 'curl/')
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// Use basic errors when debug mode is disabled
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if (!this.options.render.debug) {
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// Json format is compatible with Youch json responses
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const json = {
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status: err.statusCode,
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message: err.message,
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name: err.name
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}
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if (isJson) {
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sendResponse(JSON.stringify(json, undefined, 2), 'text/json')
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return
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}
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const html = this.resources.errorTemplate(json)
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sendResponse(html)
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return
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}
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// Show stack trace
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const youch = new Youch(err, req, this.readSource.bind(this))
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if (isJson) {
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youch.toJSON().then(json => { sendResponse(JSON.stringify(json, undefined, 2), 'text/json') })
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} else {
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youch.toHTML().then(html => { sendResponse(html) })
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}
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}
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async readSource (frame) {
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const serverBundle = this.resources.serverBundle
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// Initialize smc cache
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if (!serverBundle.$maps) {
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serverBundle.$maps = {}
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}
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// Remove webpack:/// & query string from the end
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const sanitizeName = name => name ? name.replace('webpack:///', '').split('?')[0] : ''
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// SourceMap Support for SSR Bundle
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if (serverBundle && serverBundle.maps[frame.fileName]) {
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// Read SourceMap object
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const smc = serverBundle.$maps[frame.fileName] || new SourceMapConsumer(serverBundle.maps[frame.fileName])
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serverBundle.$maps[frame.fileName] = smc
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// Try to find original position
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const { line, column, name, source } = smc.originalPositionFor({
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line: frame.getLineNumber() || 0,
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column: frame.getColumnNumber() || 0
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})
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if (line) {
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frame.lineNumber = line
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}
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if (column) {
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frame.columnNumber = column
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}
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if (name) {
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frame.functionName = name
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}
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if (source) {
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frame.fileName = sanitizeName(source)
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// Source detected, try to get original source code
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const contents = smc.sourceContentFor(source)
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if (contents) {
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frame.contents = contents
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return
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}
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}
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}
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// Return if fileName is still unknown
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if (!frame.fileName) {
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return
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}
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frame.fileName = sanitizeName(frame.fileName)
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// Try to read from SSR bundle files
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if (serverBundle && serverBundle.files[frame.fileName]) {
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frame.contents = serverBundle.files[frame.fileName]
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return
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}
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// Possible paths for file
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const searchPath = [
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this.options.rootDir,
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join(this.options.buildDir, 'dist'),
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this.options.srcDir,
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this.options.buildDir
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]
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// Scan filesystem
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for (let pathDir of searchPath) {
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let fullPath = resolve(pathDir, frame.fileName)
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let source = await fs.readFile(fullPath, 'utf-8').catch(() => null)
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if (source) {
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frame.contents = source
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return
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}
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}
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}
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async renderRoute (url, context = {}) {
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/* istanbul ignore if */
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if (!this.isReady) {
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return new Promise(resolve => {
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setTimeout(() => resolve(this.renderRoute(url, context)), 1000)
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})
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}
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// Log rendered url
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debug(`Rendering url ${url}`)
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// Add url and isSever to the context
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context.url = url
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context.isServer = true
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// Basic response if SSR is disabled or spa data provided
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const SPAData = context.spa || (context.res && context.res.spa)
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if (this.noSSR || SPAData) {
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const data = {
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HTML_ATTRS: '',
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BODY_ATTRS: '',
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HEAD: '',
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APP: '<div id="__nuxt"></div>'
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}
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if (SPAData) {
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Object.assign(data, SPAData)
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}
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const html = this.resources.spaTemplate(data)
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return { html }
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}
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// Call renderToString from the bundleRenderer and generate the HTML (will update the context as well)
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let APP = await this.bundleRenderer.renderToString(context)
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if (!context.nuxt.serverRendered) {
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APP = '<div id="__nuxt"></div>'
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}
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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()
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if (this.options._routerBaseSpecified) {
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HEAD += `<base href="${this.options.router.base}">`
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}
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let resourceHints = ''
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if (!this.staticSSR) {
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if (this.options.render.resourceHints) {
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resourceHints = context.renderResourceHints()
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HEAD += resourceHints
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}
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APP += `<script type="text/javascript">window.__NUXT__=${serialize(context.nuxt, { isJSON: true })};</script>`
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APP += context.renderScripts()
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}
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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(),
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BODY_ATTRS: m.bodyAttrs.text(),
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HEAD,
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APP
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})
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return {
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html,
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resourceHints,
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error: context.nuxt.error,
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redirected: context.redirected
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}
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}
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async renderAndGetWindow (url, opts = {}) {
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/* istanbul ignore if */
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if (!jsdom) {
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try {
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jsdom = require('jsdom')
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} catch (e) /* istanbul ignore next */ {
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console.error('Fail when calling nuxt.renderAndGetWindow(url)') // eslint-disable-line no-console
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console.error('jsdom module is not installed') // eslint-disable-line no-console
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console.error('Please install jsdom with: npm install --save-dev jsdom') // eslint-disable-line no-console
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throw e
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}
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}
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let options = {
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resources: 'usable', // load subresources (https://github.com/tmpvar/jsdom#loading-subresources)
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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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}
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}
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}
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if (opts.virtualConsole !== false) {
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options.virtualConsole = new jsdom.VirtualConsole().sendTo(console)
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}
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url = url || 'http://localhost:3000'
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const { window } = await jsdom.JSDOM.fromURL(url, options)
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// If Nuxt could not be loaded (error from the server-side)
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const nuxtExists = window.document.body.innerHTML.includes('window.__NUXT__')
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/* istanbul ignore if */
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if (!nuxtExists) {
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let error = new Error('Could not load the nuxt app')
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error.body = window.document.body.innerHTML
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throw error
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}
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// Used by nuxt.js to say when the components are loaded and the app ready
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await new Promise((resolve) => {
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window._onNuxtLoaded = () => resolve(window)
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})
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// Send back window object
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return window
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}
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}
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const parseTemplate = templateStr => _.template(templateStr, {
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interpolate: /{{([\s\S]+?)}}/g
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})
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const resourceMap = [
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{
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key: 'clientManifest',
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fileName: 'vue-ssr-client-manifest.json',
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transform: JSON.parse
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},
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{
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key: 'serverBundle',
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fileName: 'server-bundle.json',
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transform: JSON.parse
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},
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{
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key: 'ssrTemplate',
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fileName: 'index.ssr.html',
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transform: parseTemplate
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},
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{
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key: 'spaTemplate',
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fileName: 'index.spa.html',
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transform: parseTemplate
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}
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]
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// Protector utility against request to SSR bundle files
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const ssrResourceRegex = new RegExp(resourceMap.map(resource => resource.fileName).join('|'), 'i')
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