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next-serverless-loader.ts
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next-serverless-loader.ts
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import devalue from 'next/dist/compiled/devalue'
import escapeRegexp from 'next/dist/compiled/escape-string-regexp'
import { join } from 'path'
import { parse } from 'querystring'
import { loader } from 'webpack'
import { API_ROUTE } from '../../../lib/constants'
import {
BUILD_MANIFEST,
REACT_LOADABLE_MANIFEST,
ROUTES_MANIFEST,
} from '../../../next-server/lib/constants'
import { isDynamicRoute } from '../../../next-server/lib/router/utils'
import { __ApiPreviewProps } from '../../../next-server/server/api-utils'
export type ServerlessLoaderQuery = {
page: string
distDir: string
absolutePagePath: string
absoluteAppPath: string
absoluteDocumentPath: string
absoluteErrorPath: string
buildId: string
assetPrefix: string
generateEtags: string
canonicalBase: string
basePath: string
runtimeConfig: string
previewProps: string
loadedEnvFiles: string
}
const vercelHeader = 'x-vercel-id'
const nextServerlessLoader: loader.Loader = function () {
const {
distDir,
absolutePagePath,
page,
buildId,
canonicalBase,
assetPrefix,
absoluteAppPath,
absoluteDocumentPath,
absoluteErrorPath,
generateEtags,
basePath,
runtimeConfig,
previewProps,
loadedEnvFiles,
}: ServerlessLoaderQuery =
typeof this.query === 'string' ? parse(this.query.substr(1)) : this.query
const buildManifest = join(distDir, BUILD_MANIFEST).replace(/\\/g, '/')
const reactLoadableManifest = join(distDir, REACT_LOADABLE_MANIFEST).replace(
/\\/g,
'/'
)
const routesManifest = join(distDir, ROUTES_MANIFEST).replace(/\\/g, '/')
const escapedBuildId = escapeRegexp(buildId)
const pageIsDynamicRoute = isDynamicRoute(page)
const encodedPreviewProps = devalue(
JSON.parse(previewProps) as __ApiPreviewProps
)
const collectDynamicRouteParams = pageIsDynamicRoute
? `
function collectDynamicRouteParams(query) {
const routeRegex = getRouteRegex("${page}")
return Object.keys(routeRegex.groups)
.reduce((prev, key) => {
let value = query[key]
${
''
// query values from the proxy aren't already split into arrays
// so make sure to normalize catch-all values
}
if (routeRegex.groups[key].repeat) {
value = value.split('/')
}
prev[key] = value
return prev
}, {})
}
`
: ''
const envLoading = `
const { processEnv } = require('next/dist/lib/load-env-config')
processEnv(${Buffer.from(loadedEnvFiles, 'base64').toString()})
`
const runtimeConfigImports = runtimeConfig
? `
const { setConfig } = require('next/config')
`
: ''
const runtimeConfigSetter = runtimeConfig
? `
const runtimeConfig = ${runtimeConfig}
setConfig(runtimeConfig)
`
: 'const runtimeConfig = {}'
const dynamicRouteImports = pageIsDynamicRoute
? `
const { getRouteMatcher } = require('next/dist/next-server/lib/router/utils/route-matcher');
const { getRouteRegex } = require('next/dist/next-server/lib/router/utils/route-regex');
`
: ''
const dynamicRouteMatcher = pageIsDynamicRoute
? `
const dynamicRouteMatcher = getRouteMatcher(getRouteRegex("${page}"))
`
: ''
const rewriteImports = `
const { rewrites } = require('${routesManifest}')
const { pathToRegexp, default: pathMatch } = require('next/dist/next-server/server/lib/path-match')
`
const handleRewrites = `
const getCustomRouteMatcher = pathMatch(true)
const {prepareDestination} = require('next/dist/next-server/server/router')
function handleRewrites(parsedUrl) {
for (const rewrite of rewrites) {
const matcher = getCustomRouteMatcher(rewrite.source)
const params = matcher(parsedUrl.pathname)
if (params) {
const { parsedDestination } = prepareDestination(
rewrite.destination,
params,
parsedUrl.query,
true,
"${basePath}"
)
Object.assign(parsedUrl.query, parsedDestination.query, params)
delete parsedDestination.query
Object.assign(parsedUrl, parsedDestination)
if (parsedUrl.pathname === '${page}'){
break
}
${
pageIsDynamicRoute
? `
const dynamicParams = dynamicRouteMatcher(parsedUrl.pathname);\
if (dynamicParams) {
parsedUrl.query = {
...parsedUrl.query,
...dynamicParams
}
break
}
`
: ''
}
}
}
return parsedUrl
}
`
const handleBasePath = basePath
? `
// always strip the basePath if configured since it is required
req.url = req.url.replace(new RegExp('^${basePath}'), '') || '/'
parsedUrl.pathname = parsedUrl.pathname.replace(new RegExp('^${basePath}'), '') || '/'
`
: ''
if (page.match(API_ROUTE)) {
return `
import initServer from 'next-plugin-loader?middleware=on-init-server!'
import onError from 'next-plugin-loader?middleware=on-error-server!'
import 'next/dist/next-server/server/node-polyfill-fetch'
${envLoading}
${runtimeConfigImports}
${
/*
this needs to be called first so its available for any other imports
*/
runtimeConfigSetter
}
${dynamicRouteImports}
const { parse } = require('url')
const { apiResolver } = require('next/dist/next-server/server/api-utils')
${rewriteImports}
${dynamicRouteMatcher}
${collectDynamicRouteParams}
${handleRewrites}
export default async (req, res) => {
try {
await initServer()
// We need to trust the dynamic route params from the proxy
// to ensure we are using the correct values
const trustQuery = req.headers['${vercelHeader}']
const parsedUrl = handleRewrites(parse(req.url, true))
${handleBasePath}
const params = ${
pageIsDynamicRoute
? `
trustQuery
? collectDynamicRouteParams(parsedUrl.query)
: dynamicRouteMatcher(parsedUrl.pathname)
`
: `{}`
}
const resolver = require('${absolutePagePath}')
await apiResolver(
req,
res,
Object.assign({}, parsedUrl.query, params ),
resolver,
${encodedPreviewProps},
true,
onError
)
} catch (err) {
console.error(err)
await onError(err)
// TODO: better error for DECODE_FAILED?
if (err.code === 'DECODE_FAILED') {
res.statusCode = 400
res.end('Bad Request')
} else {
// Throw the error to crash the serverless function
throw err
}
}
}
`
} else {
return `
import initServer from 'next-plugin-loader?middleware=on-init-server!'
import onError from 'next-plugin-loader?middleware=on-error-server!'
import 'next/dist/next-server/server/node-polyfill-fetch'
const {isResSent} = require('next/dist/next-server/lib/utils');
${envLoading}
${runtimeConfigImports}
${
// this needs to be called first so its available for any other imports
runtimeConfigSetter
}
const {parse} = require('url')
const {parse: parseQs} = require('querystring')
const {renderToHTML} = require('next/dist/next-server/server/render');
const { tryGetPreviewData } = require('next/dist/next-server/server/api-utils');
const {sendHTML} = require('next/dist/next-server/server/send-html');
const {sendPayload} = require('next/dist/next-server/server/send-payload');
const buildManifest = require('${buildManifest}');
const reactLoadableManifest = require('${reactLoadableManifest}');
const Document = require('${absoluteDocumentPath}').default;
const Error = require('${absoluteErrorPath}').default;
const App = require('${absoluteAppPath}').default;
${dynamicRouteImports}
${rewriteImports}
const ComponentInfo = require('${absolutePagePath}')
const Component = ComponentInfo.default
export default Component
export const unstable_getStaticParams = ComponentInfo['unstable_getStaticParam' + 's']
export const getStaticProps = ComponentInfo['getStaticProp' + 's']
export const getStaticPaths = ComponentInfo['getStaticPath' + 's']
export const getServerSideProps = ComponentInfo['getServerSideProp' + 's']
// kept for detecting legacy exports
export const unstable_getStaticProps = ComponentInfo['unstable_getStaticProp' + 's']
export const unstable_getStaticPaths = ComponentInfo['unstable_getStaticPath' + 's']
export const unstable_getServerProps = ComponentInfo['unstable_getServerProp' + 's']
${dynamicRouteMatcher}
${collectDynamicRouteParams}
${handleRewrites}
export const config = ComponentInfo['confi' + 'g'] || {}
export const _app = App
export async function renderReqToHTML(req, res, renderMode, _renderOpts, _params) {
const fromExport = renderMode === 'export' || renderMode === true;
const options = {
App,
Document,
buildManifest,
getStaticProps,
getServerSideProps,
getStaticPaths,
reactLoadableManifest,
canonicalBase: "${canonicalBase}",
buildId: "${buildId}",
assetPrefix: "${assetPrefix}",
runtimeConfig: runtimeConfig.publicRuntimeConfig || {},
previewProps: ${encodedPreviewProps},
env: process.env,
basePath: "${basePath}",
..._renderOpts
}
let _nextData = false
let parsedUrl
try {
// We need to trust the dynamic route params from the proxy
// to ensure we are using the correct values
const trustQuery = !getStaticProps && req.headers['${vercelHeader}']
const parsedUrl = handleRewrites(parse(req.url, true))
${handleBasePath}
if (parsedUrl.pathname.match(/_next\\/data/)) {
_nextData = true
parsedUrl.pathname = parsedUrl.pathname
.replace(new RegExp('/_next/data/${escapedBuildId}/'), '/')
.replace(/\\.json$/, '')
}
const renderOpts = Object.assign(
{
Component,
pageConfig: config,
nextExport: fromExport,
isDataReq: _nextData,
},
options,
)
${
page === '/_error'
? `
if (!res.statusCode) {
res.statusCode = 404
}
`
: ''
}
${
pageIsDynamicRoute
? `
const params = (
fromExport &&
!getStaticProps &&
!getServerSideProps
) ? {}
: trustQuery
? collectDynamicRouteParams(parsedUrl.query)
: dynamicRouteMatcher(parsedUrl.pathname) || {};
`
: `const params = {};`
}
${
// Temporary work around: `x-now-route-matches` is a platform header
// _only_ set for `Prerender` requests. We should move this logic
// into our builder to ensure we're decoupled. However, this entails
// removing reliance on `req.url` and using `req.query` instead
// (which is needed for "custom routes" anyway).
pageIsDynamicRoute
? `const nowParams = req.headers && req.headers["x-now-route-matches"]
? getRouteMatcher(
(function() {
const { re, groups } = getRouteRegex("${page}");
return {
re: {
// Simulate a RegExp match from the \`req.url\` input
exec: str => {
const obj = parseQs(str);
return Object.keys(obj).reduce(
(prev, key) =>
Object.assign(prev, {
[key]: obj[key]
}),
{}
);
}
},
groups
};
})()
)(req.headers["x-now-route-matches"])
: null;
`
: `const nowParams = null;`
}
// make sure to set renderOpts to the correct params e.g. _params
// if provided from worker or params if we're parsing them here
renderOpts.params = _params || params
const isFallback = parsedUrl.query.__nextFallback
const previewData = tryGetPreviewData(req, res, options.previewProps)
const isPreviewMode = previewData !== false
let result = await renderToHTML(req, res, "${page}", Object.assign({}, getStaticProps ? { ...(parsedUrl.query.amp ? { amp: '1' } : {}) } : parsedUrl.query, nowParams ? nowParams : params, _params, isFallback ? { __nextFallback: 'true' } : {}), renderOpts)
if (!renderMode) {
if (_nextData || getStaticProps || getServerSideProps) {
sendPayload(req, res, _nextData ? JSON.stringify(renderOpts.pageData) : result, _nextData ? 'json' : 'html', ${
generateEtags === 'true' ? true : false
}, {
private: isPreviewMode,
stateful: !!getServerSideProps,
revalidate: renderOpts.revalidate,
})
return null
}
} else if (isPreviewMode) {
res.setHeader(
'Cache-Control',
'private, no-cache, no-store, max-age=0, must-revalidate'
)
}
if (renderMode) return { html: result, renderOpts }
return result
} catch (err) {
if (!parsedUrl) {
parsedUrl = parse(req.url, true)
}
if (err.code === 'ENOENT') {
res.statusCode = 404
} else if (err.code === 'DECODE_FAILED') {
// TODO: better error?
res.statusCode = 400
} else {
console.error('Unhandled error during request:', err)
// Backwards compat (call getInitialProps in custom error):
try {
await renderToHTML(req, res, "/_error", parsedUrl.query, Object.assign({}, options, {
getStaticProps: undefined,
getStaticPaths: undefined,
getServerSideProps: undefined,
Component: Error,
err: err,
// Short-circuit rendering:
isDataReq: true
}))
} catch (underErrorErr) {
console.error('Failed call /_error subroutine, continuing to crash function:', underErrorErr)
}
// Throw the error to crash the serverless function
if (isResSent(res)) {
console.error('!!! WARNING !!!')
console.error(
'Your function crashed, but closed the response before allowing the function to exit.\\n' +
'This may cause unexpected behavior for the next request.'
)
console.error('!!! WARNING !!!')
}
throw err
}
const result = await renderToHTML(req, res, "/_error", parsedUrl.query, Object.assign({}, options, {
getStaticProps: undefined,
getStaticPaths: undefined,
getServerSideProps: undefined,
Component: Error,
err: res.statusCode === 404 ? undefined : err
}))
return result
}
}
export async function render (req, res) {
try {
await initServer()
const html = await renderReqToHTML(req, res)
if (html) {
sendHTML(req, res, html, {generateEtags: ${
generateEtags === 'true' ? true : false
}})
}
} catch(err) {
console.error(err)
await onError(err)
// Throw the error to crash the serverless function
throw err
}
}
`
}
}
export default nextServerlessLoader