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next.js/packages/next-server/server/next-server.js
2018-10-02 00:55:31 +02:00

257 lines
8 KiB
JavaScript

/* eslint-disable import/first, no-return-await */
import { resolve, join, sep } from 'path'
import { parse as parseUrl } from 'url'
import { parse as parseQs } from 'querystring'
import fs from 'fs'
import {
renderToHTML,
renderErrorToHTML,
sendHTML,
serveStatic
} from './render'
import Router, {route} from './router'
import { isInternalUrl } from './utils'
import loadConfig from 'next-server/next-config'
import {PHASE_PRODUCTION_SERVER, BLOCKED_PAGES, BUILD_ID_FILE, CLIENT_STATIC_FILES_PATH, CLIENT_STATIC_FILES_RUNTIME} from 'next-server/constants'
import * as asset from '../lib/asset'
import * as envConfig from '../lib/runtime-config'
import { isResSent } from '../lib/utils'
export default class Server {
constructor ({ dir = '.', staticMarkup = false, quiet = false, conf = null } = {}) {
this.dir = resolve(dir)
this.quiet = quiet
const phase = this.currentPhase()
this.nextConfig = loadConfig(phase, this.dir, conf)
this.distDir = join(this.dir, this.nextConfig.distDir)
// Only serverRuntimeConfig needs the default
// publicRuntimeConfig gets it's default in client/index.js
const {serverRuntimeConfig = {}, publicRuntimeConfig, assetPrefix, generateEtags} = this.nextConfig
this.buildId = this.readBuildId()
this.renderOpts = {
staticMarkup,
distDir: this.distDir,
buildId: this.buildId,
generateEtags
}
// Only the `publicRuntimeConfig` key is exposed to the client side
// It'll be rendered as part of __NEXT_DATA__ on the client side
if (publicRuntimeConfig) {
this.renderOpts.runtimeConfig = publicRuntimeConfig
}
// Initialize next/config with the environment configuration
envConfig.setConfig({
serverRuntimeConfig,
publicRuntimeConfig
})
const routes = this.generateRoutes()
this.router = new Router(routes)
this.setAssetPrefix(assetPrefix)
}
currentPhase () {
return PHASE_PRODUCTION_SERVER
}
handleRequest (req, res, parsedUrl) {
// Parse url if parsedUrl not provided
if (!parsedUrl || typeof parsedUrl !== 'object') {
parsedUrl = parseUrl(req.url, true)
}
// Parse the querystring ourselves if the user doesn't handle querystring parsing
if (typeof parsedUrl.query === 'string') {
parsedUrl.query = parseQs(parsedUrl.query)
}
res.statusCode = 200
return this.run(req, res, parsedUrl)
.catch((err) => {
if (!this.quiet) console.error(err)
res.statusCode = 500
res.end('Internal Server Error')
})
}
getRequestHandler () {
return this.handleRequest.bind(this)
}
setAssetPrefix (prefix) {
this.renderOpts.assetPrefix = prefix ? prefix.replace(/\/$/, '') : ''
asset.setAssetPrefix(this.renderOpts.assetPrefix)
}
// Backwards compatibility
async prepare () {}
// Backwards compatibility
async close () {}
setImmutableAssetCacheControl (res) {
res.setHeader('Cache-Control', 'public, max-age=31536000, immutable')
}
generateRoutes () {
const routes = [
{
match: route('/_next/static/:path*'),
fn: async (req, res, params) => {
// The commons folder holds commonschunk files
// The chunks folder holds dynamic entries
// The buildId folder holds pages and potentially other assets. As buildId changes per build it can be long-term cached.
if (params.path[0] === CLIENT_STATIC_FILES_RUNTIME || params.path[0] === 'chunks' || params.path[0] === this.buildId) {
this.setImmutableAssetCacheControl(res)
}
const p = join(this.distDir, CLIENT_STATIC_FILES_PATH, ...(params.path || []))
await this.serveStatic(req, res, p)
}
},
{
match: route('/_next/:path*'),
// This path is needed because `render()` does a check for `/_next` and the calls the routing again
fn: async (req, res, params, parsedUrl) => {
await this.render404(req, res, parsedUrl)
}
},
{
// It's very important keep this route's param optional.
// (but it should support as many as params, seperated by '/')
// Othewise this will lead to a pretty simple DOS attack.
// See more: https://github.com/zeit/next.js/issues/2617
match: route('/static/:path*'),
fn: async (req, res, params) => {
const p = join(this.dir, 'static', ...(params.path || []))
await this.serveStatic(req, res, p)
}
}
]
if (this.nextConfig.useFileSystemPublicRoutes) {
// It's very important keep this route's param optional.
// (but it should support as many as params, seperated by '/')
// Othewise this will lead to a pretty simple DOS attack.
// See more: https://github.com/zeit/next.js/issues/2617
routes.push({
match: route('/:path*'),
fn: async (req, res, params, parsedUrl) => {
const { pathname, query } = parsedUrl
await this.render(req, res, pathname, query, parsedUrl)
}
})
}
return routes
}
async run (req, res, parsedUrl) {
const fn = this.router.match(req, res, parsedUrl)
if (fn) {
await fn()
return
}
if (req.method === 'GET' || req.method === 'HEAD') {
await this.render404(req, res, parsedUrl)
} else {
res.statusCode = 501
res.end('Not Implemented')
}
}
async render (req, res, pathname, query, parsedUrl) {
if (isInternalUrl(req.url)) {
return this.handleRequest(req, res, parsedUrl)
}
if (BLOCKED_PAGES.indexOf(pathname) !== -1) {
return await this.render404(req, res, parsedUrl)
}
const html = await this.renderToHTML(req, res, pathname, query)
if (isResSent(res)) {
return
}
if (this.nextConfig.poweredByHeader) {
res.setHeader('X-Powered-By', 'Next.js ' + process.env.NEXT_VERSION)
}
return sendHTML(req, res, html, req.method, this.renderOpts)
}
async renderToHTML (req, res, pathname, query) {
try {
const out = await renderToHTML(req, res, pathname, query, this.renderOpts)
return out
} catch (err) {
if (err.code === 'ENOENT') {
res.statusCode = 404
return this.renderErrorToHTML(null, req, res, pathname, query)
} else {
if (!this.quiet) console.error(err)
res.statusCode = 500
return this.renderErrorToHTML(err, req, res, pathname, query)
}
}
}
async renderError (err, req, res, pathname, query) {
const html = await this.renderErrorToHTML(err, req, res, pathname, query)
return sendHTML(req, res, html, req.method, this.renderOpts)
}
async renderErrorToHTML (err, req, res, pathname, query) {
return renderErrorToHTML(err, req, res, pathname, query, this.renderOpts)
}
async render404 (req, res, parsedUrl = parseUrl(req.url, true)) {
const { pathname, query } = parsedUrl
res.statusCode = 404
res.setHeader('Cache-Control', 'no-cache, no-store, max-age=0, must-revalidate')
return this.renderError(null, req, res, pathname, query)
}
async serveStatic (req, res, path) {
if (!this.isServeableUrl(path)) {
return this.render404(req, res)
}
try {
return await serveStatic(req, res, path)
} catch (err) {
if (err.code === 'ENOENT') {
this.render404(req, res)
} else {
throw err
}
}
}
isServeableUrl (path) {
const resolved = resolve(path)
if (
resolved.indexOf(join(this.distDir) + sep) !== 0 &&
resolved.indexOf(join(this.dir, 'static') + sep) !== 0
) {
// Seems like the user is trying to traverse the filesystem.
return false
}
return true
}
readBuildId () {
if (!fs.existsSync(resolve(this.distDir, BUILD_ID_FILE))) {
throw new Error(`Could not find a valid build in the '${this.distDir}' directory! Try building your app with 'next build' before starting the server.`)
}
const buildIdPath = join(this.distDir, BUILD_ID_FILE)
const buildId = fs.readFileSync(buildIdPath, 'utf8')
return buildId.trim()
}
}