import { stringify } from 'querystring' import Vue from 'vue' import omit from 'lodash/omit' import middleware from './middleware' import { applyAsyncData, sanitizeComponent, getMatchedComponents, getContext, middlewareSeries, promisify, urlJoin } from './utils' import { createApp, NuxtError } from './index' const debug = require('debug')('nuxt:render') debug.color = 4 // force blue color const isDev = <%= isDev %> const noopApp = () => new Vue({ render: h => h('div') }) const createNext = ssrContext => (opts) => { ssrContext.redirected = opts // If nuxt generate if (!ssrContext.res) { ssrContext.nuxt.serverRendered = false return } opts.query = stringify(opts.query) opts.path = opts.path + (opts.query ? '?' + opts.query : '') const routerBase = '<%= router.base %>' if (!opts.path.startsWith('http') && (routerBase !== '/' && !opts.path.startsWith(routerBase))) { opts.path = urlJoin(routerBase, opts.path) } // Avoid loop redirect if (opts.path === ssrContext.url) { ssrContext.redirected = false return } ssrContext.res.writeHead(opts.status, { 'Location': opts.path }) ssrContext.res.end() } // This exported function will be called by `bundleRenderer`. // This is where we perform data-prefetching to determine the // state of our application before actually rendering it. // Since data fetching is async, this function is expected to // return a Promise that resolves to the app instance. export default async (ssrContext) => { // Create ssrContext.next for simulate next() of beforeEach() when wanted to redirect ssrContext.redirected = false ssrContext.next = createNext(ssrContext) // Used for beforeNuxtRender({ Components, nuxtState }) ssrContext.beforeRenderFns = [] // Nuxt object (window{{globals.context}}, defaults to window.__NUXT__) ssrContext.nuxt = { layout: 'default', data: [], error: null<%= (store ? ', state: null' : '') %>, serverRendered: true } // Create the app definition and the instance (created for each request) const { app, router<%= (store ? ', store' : '') %> } = await createApp(ssrContext) const _app = new Vue(app) // Add meta infos (used in renderer.js) ssrContext.meta = _app.$meta() // Keep asyncData for each matched component in ssrContext (used in app/utils.js via this.$ssrContext) ssrContext.asyncData = {} const beforeRender = async () => { // Call beforeNuxtRender() methods await Promise.all(ssrContext.beforeRenderFns.map(fn => promisify(fn, { Components, nuxtState: ssrContext.nuxt }))) <% if (store) { %> // Add the state from the vuex store ssrContext.nuxt.state = store.state <% } %> } const renderErrorPage = async () => { // Load layout for error page const errLayout = (typeof NuxtError.layout === 'function' ? NuxtError.layout(app.context) : NuxtError.layout) ssrContext.nuxt.layout = errLayout || 'default' await _app.loadLayout(errLayout) _app.setLayout(errLayout) await beforeRender() return _app } const render404Page = () => { app.context.error({ statusCode: 404, path: ssrContext.url, message: `<%= messages.error_404 %>` }) return renderErrorPage() } <% if (isDev) { %>const s = isDev && Date.now()<% } %> // Components are already resolved by setContext -> getRouteData (app/utils.js) const Components = getMatchedComponents(router.match(ssrContext.url)) <% if (store) { %> /* ** Dispatch store nuxtServerInit */ if (store._actions && store._actions.nuxtServerInit) { try { await store.dispatch('nuxtServerInit', app.context) } catch (err) { debug('error occurred when calling nuxtServerInit: ', err.message) throw err } } // ...If there is a redirect or an error, stop the process if (ssrContext.redirected) return noopApp() if (ssrContext.nuxt.error) return renderErrorPage() <% } %> /* ** Call global middleware (nuxt.config.js) */ let midd = <%= serialize(router.middleware).replace('middleware(', 'function(') %><%= isTest ? '// eslint-disable-line' : '' %> midd = midd.map((name) => { if (typeof name === 'function') return name if (typeof middleware[name] !== 'function') { app.context.error({ statusCode: 500, message: 'Unknown middleware ' + name }) } return middleware[name] }) await middlewareSeries(midd, app.context) // ...If there is a redirect or an error, stop the process if (ssrContext.redirected) return noopApp() if (ssrContext.nuxt.error) return renderErrorPage() /* ** Set layout */ let layout = Components.length ? Components[0].options.layout : NuxtError.layout if (typeof layout === 'function') layout = layout(app.context) await _app.loadLayout(layout) if (ssrContext.nuxt.error) return renderErrorPage() layout = _app.setLayout(layout) ssrContext.nuxt.layout = _app.layoutName /* ** Call middleware (layout + pages) */ midd = [] if (layout.middleware) midd = midd.concat(layout.middleware) Components.forEach((Component) => { if (Component.options.middleware) { midd = midd.concat(Component.options.middleware) } }) midd = midd.map((name) => { if (typeof name === 'function') return name if (typeof middleware[name] !== 'function') { app.context.error({ statusCode: 500, message: 'Unknown middleware ' + name }) } return middleware[name] }) await middlewareSeries(midd, app.context) // ...If there is a redirect or an error, stop the process if (ssrContext.redirected) return noopApp() if (ssrContext.nuxt.error) return renderErrorPage() /* ** Call .validate() */ let isValid = true try { for (const Component of Components) { if (typeof Component.options.validate !== 'function') { continue } isValid = await Component.options.validate(app.context) if (!isValid) { break } } } catch (validationError) { // ...If .validate() threw an error app.context.error({ statusCode: validationError.statusCode || '500', message: validationError.message }) return renderErrorPage() } // ...If .validate() returned false if (!isValid) { // Don't server-render the page in generate mode if (ssrContext._generate) ssrContext.nuxt.serverRendered = false // Render a 404 error page return render404Page() } // If no Components found, returns 404 if (!Components.length) return render404Page() // Call asyncData & fetch hooks on components matched by the route. const asyncDatas = await Promise.all(Components.map((Component) => { const promises = [] // Call asyncData(context) if (Component.options.asyncData && typeof Component.options.asyncData === 'function') { const promise = promisify(Component.options.asyncData, app.context) promise.then((asyncDataResult) => { ssrContext.asyncData[Component.cid] = asyncDataResult applyAsyncData(Component) return asyncDataResult }) promises.push(promise) } else { promises.push(null) } // Call fetch(context) if (Component.options.fetch) { promises.push(Component.options.fetch(app.context)) } else { promises.push(null) } return Promise.all(promises) })) <% if (isDev) { %>if (asyncDatas.length) debug('Data fetching ' + ssrContext.url + ': ' + (Date.now() - s) + 'ms')<% } %> // datas are the first row of each ssrContext.nuxt.data = asyncDatas.map(r => r[0] || {}) // ...If there is a redirect or an error, stop the process if (ssrContext.redirected) return noopApp() if (ssrContext.nuxt.error) return renderErrorPage() // Call beforeNuxtRender methods & add store state await beforeRender() return _app }