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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
poweredByHeader: string
canonicalBase: string
basePath: string
runtimeConfig: string
previewProps: string
loadedEnvFiles: string
i18n: string
}
const vercelHeader = 'x-vercel-id'
const nextServerlessLoader: loader.Loader = function () {
const {
distDir,
absolutePagePath,
page,
buildId,
canonicalBase,
assetPrefix,
absoluteAppPath,
absoluteDocumentPath,
absoluteErrorPath,
generateEtags,
poweredByHeader,
basePath,
runtimeConfig,
previewProps,
loadedEnvFiles,
i18n,
}: 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 i18nEnabled = !!i18n
const defaultRouteRegex = pageIsDynamicRoute
? `
const defaultRouteRegex = getRouteRegex("${page}")
`
: ''
const normalizeDynamicRouteParams = pageIsDynamicRoute
? `
function normalizeDynamicRouteParams(query) {
return Object.keys(defaultRouteRegex.groups)
.reduce((prev, key) => {
let value = query[key]
${
''
// non-provided optional values should be undefined so normalize
// them to undefined
}
if(
defaultRouteRegex.groups[key].optional &&
(!value || (
Array.isArray(value) &&
value.length === 1 &&
${
''
// fallback optional catch-all SSG pages have
// [[...paramName]] for the root path on Vercel
}
(value[0] === 'index' || value[0] === \`[[...\${key}]]\`)
))
) {
value = undefined
delete query[key]
}
${
''
// query values from the proxy aren't already split into arrays
// so make sure to normalize catch-all values
}
if (
value &&
typeof value === 'string' &&
defaultRouteRegex.groups[key].repeat
) {
value = value.split('/')
}
if (value) {
prev[key] = value
}
return prev
}, {})
}
`
: ''
const envLoading = `
const { processEnv } = require('@next/env')
processEnv(${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('${routesManifest}')
const { pathToRegexp, default: pathMatch } = require('next/dist/next-server/lib/router/utils/path-match')
`
const handleRewrites = `
const getCustomRouteMatcher = pathMatch(true)
const prepareDestination = require('next/dist/next-server/lib/router/utils/prepare-destination').default
function handleRewrites(parsedUrl) {
for (const rewrite of rewrites) {
const matcher = getCustomRouteMatcher(rewrite.source)
const params = matcher(parsedUrl.pathname)
if (params) {
const { parsedDestination } = prepareDestination(
rewrite.destination,
params,
parsedUrl.query,
true,
"${basePath}"
)
Object.assign(parsedUrl.query, parsedDestination.query)
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}'), '') || '/'
`
: ''
const handleLocale = i18nEnabled
? `
// get pathname from URL with basePath stripped for locale detection
const i18n = ${i18n}
const accept = require('@hapi/accept')
const cookie = require('next/dist/compiled/cookie')
const { detectLocaleCookie } = require('next/dist/next-server/lib/i18n/detect-locale-cookie')
const { detectDomainLocale } = require('next/dist/next-server/lib/i18n/detect-domain-locale')
const { normalizeLocalePath } = require('next/dist/next-server/lib/i18n/normalize-locale-path')
let locales = i18n.locales
let defaultLocale = i18n.defaultLocale
let detectedLocale = detectLocaleCookie(req, i18n.locales)
let acceptPreferredLocale = accept.language(
req.headers['accept-language'],
i18n.locales
)
const detectedDomain = detectDomainLocale(
i18n.domains,
req,
)
if (detectedDomain) {
defaultLocale = detectedDomain.defaultLocale
detectedLocale = defaultLocale
}
// if not domain specific locale use accept-language preferred
detectedLocale = detectedLocale || acceptPreferredLocale
let localeDomainRedirect
const localePathResult = normalizeLocalePath(parsedUrl.pathname, i18n.locales)
routeNoAssetPath = normalizeLocalePath(routeNoAssetPath, i18n.locales).pathname
if (localePathResult.detectedLocale) {
detectedLocale = localePathResult.detectedLocale
req.url = formatUrl({
...parsedUrl,
pathname: localePathResult.pathname,
})
parsedUrl.pathname = localePathResult.pathname
// check if the locale prefix matches a domain's defaultLocale
// and we're on a locale specific domain if so redirect to that domain
if (detectedDomain) {
const matchedDomain = detectDomainLocale(
i18n.domains,
undefined,
detectedLocale
)
if (matchedDomain) {
localeDomainRedirect = \`http\${
matchedDomain.http ? '' : 's'
}://\${matchedDomain.domain}\`
}
}
}
const denormalizedPagePath = denormalizePagePath(parsedUrl.pathname || '/')
const detectedDefaultLocale =
!detectedLocale ||
detectedLocale.toLowerCase() === defaultLocale.toLowerCase()
const shouldStripDefaultLocale =
detectedDefaultLocale &&
denormalizedPagePath.toLowerCase() === \`/\${i18n.defaultLocale.toLowerCase()}\`
const shouldAddLocalePrefix =
!detectedDefaultLocale && denormalizedPagePath === '/'
detectedLocale = detectedLocale || i18n.defaultLocale
if (
!fromExport &&
!nextStartMode &&
i18n.localeDetection !== false &&
(
localeDomainRedirect ||
shouldAddLocalePrefix ||
shouldStripDefaultLocale
)
) {
// set the NEXT_LOCALE cookie when a user visits the default locale
// with the locale prefix so that they aren't redirected back to
// their accept-language preferred locale
if (
shouldStripDefaultLocale &&
acceptPreferredLocale !== defaultLocale
) {
const previous = res.getHeader('set-cookie')
res.setHeader(
'set-cookie',
[
...(typeof previous === 'string'
? [previous]
: Array.isArray(previous)
? previous
: []),
cookie.serialize('NEXT_LOCALE', defaultLocale, {
httpOnly: true,
path: '/',
})
])
}
res.setHeader(
'Location',
formatUrl({
// make sure to include any query values when redirecting
...parsedUrl,
pathname:
localeDomainRedirect
? localeDomainRedirect
: shouldStripDefaultLocale
? '/'
: \`/\${detectedLocale}\`,
})
)
res.statusCode = 307
res.end()
return
}
detectedLocale = detectedLocale || defaultLocale
`
: `
const i18n = {}
const detectedLocale = undefined
const defaultLocale = undefined
const locales = undefined
`
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: parseUrl } = require('url')
const { apiResolver } = require('next/dist/next-server/server/api-utils')
${rewriteImports}
${dynamicRouteMatcher}
${defaultRouteRegex}
${normalizeDynamicRouteParams}
${handleRewrites}
export default async (req, res) => {
try {
await initServer()
// We need to trust the dynamic route params from the proxy
// to ensure we are using the correct values
const trustQuery = req.headers['${vercelHeader}']
const parsedUrl = handleRewrites(parseUrl(req.url, true))
${handleBasePath}
const params = ${
pageIsDynamicRoute
? `
normalizeDynamicRouteParams(
trustQuery
? parsedUrl.query
: dynamicRouteMatcher(parsedUrl.pathname)
)
`
: `{}`
}
const resolver = await require('${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}
${
// this needs to be called first so its available for any other imports
runtimeConfigSetter
}
const {parse: parseUrl, format: formatUrl} = require('url')
const {parse: parseQs} = require('querystring')
const { renderToHTML } = require('next/dist/next-server/server/render');
const { tryGetPreviewData } = require('next/dist/next-server/server/api-utils');
const { denormalizePagePath } = require('next/dist/next-server/server/denormalize-page-path')
const { setLazyProp, getCookieParser } = require('next/dist/next-server/server/api-utils')
const {sendPayload} = require('next/dist/next-server/server/send-payload');
const buildManifest = require('${buildManifest}');
const reactLoadableManifest = require('${reactLoadableManifest}');
const appMod = require('${absoluteAppPath}')
let App = appMod.default || appMod.then && appMod.then(mod => mod.default);
${dynamicRouteImports}
${rewriteImports}
const compMod = require('${absolutePagePath}')
let Component = compMod.default || compMod.then && compMod.then(mod => mod.default)
export default Component
export let getStaticProps = compMod['getStaticProp' + 's'] || compMod.then && compMod.then(mod => mod['getStaticProp' + 's'])
export let getStaticPaths = compMod['getStaticPath' + 's'] || compMod.then && compMod.then(mod => mod['getStaticPath' + 's'])
export let getServerSideProps = compMod['getServerSideProp' + 's'] || compMod.then && compMod.then(mod => mod['getServerSideProp' + 's'])
// kept for detecting legacy exports
export const unstable_getStaticParams = compMod['unstable_getStaticParam' + 's'] || compMod.then && compMod.then(mod => mod['unstable_getStaticParam' + 's'])
export const unstable_getStaticProps = compMod['unstable_getStaticProp' + 's'] || compMod.then && compMod.then(mod => mod['unstable_getStaticProp' + 's'])
export const unstable_getStaticPaths = compMod['unstable_getStaticPath' + 's'] || compMod.then && compMod.then(mod => mod['unstable_getStaticPath' + 's'])
export const unstable_getServerProps = compMod['unstable_getServerProp' + 's'] || compMod.then && compMod.then(mod => mod['unstable_getServerProp' + 's'])
${dynamicRouteMatcher}
${defaultRouteRegex}
${normalizeDynamicRouteParams}
${handleRewrites}
export let config = compMod['confi' + 'g'] || (compMod.then && compMod.then(mod => mod['confi' + 'g'])) || {}
export const _app = App
export async function renderReqToHTML(req, res, renderMode, _renderOpts, _params) {
let Document
let Error
;[
getStaticProps,
getServerSideProps,
getStaticPaths,
Component,
App,
config,
{ default: Document },
{ default: Error }
] = await Promise.all([
getStaticProps,
getServerSideProps,
getStaticPaths,
Component,
App,
config,
require('${absoluteDocumentPath}'),
require('${absoluteErrorPath}')
])
const fromExport = renderMode === 'export' || renderMode === true;
const nextStartMode = renderMode === 'passthrough'
setLazyProp({ req }, 'cookies', getCookieParser(req))
const options = {
App,
Document,
buildManifest,
getStaticProps,
getServerSideProps,
getStaticPaths,
reactLoadableManifest,
canonicalBase: "${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['${vercelHeader}']
let parsedUrl = parseUrl(req.url, true)
let routeNoAssetPath = parsedUrl.pathname${
basePath ? `.replace(new RegExp('^${basePath}'), '') || '/'` : ''
}
const origQuery = Object.assign({}, parsedUrl.query)
parsedUrl = handleRewrites(parsedUrl)
${handleBasePath}
// remove ?amp=1 from request URL if rendering for export
if (fromExport && parsedUrl.query.amp) {
const queryNoAmp = Object.assign({}, origQuery)
delete queryNoAmp.amp
req.url = formatUrl({
...parsedUrl,
search: undefined,
query: queryNoAmp
})
}
if (parsedUrl.pathname.match(/_next\\/data/)) {
const {
default: getRouteNoAssetPath,
} = require('next/dist/next-server/lib/router/utils/get-route-from-asset-path');
_nextData = true;
parsedUrl.pathname = getRouteNoAssetPath(
parsedUrl.pathname.replace(
new RegExp('/_next/data/${escapedBuildId}/'),
'/'
),
'.json'
);
routeNoAssetPath = parsedUrl.pathname
}
${handleLocale}
const renderOpts = Object.assign(
{
Component,
pageConfig: config,
nextExport: fromExport,
isDataReq: _nextData,
locale: detectedLocale,
locales,
defaultLocale: i18n.defaultLocale,
},
options,
)
${
page === '/_error'
? `
if (!res.statusCode) {
res.statusCode = 404
}
`
: ''
}
${
pageIsDynamicRoute
? `
const params = (
fromExport
) ? {}
: normalizeDynamicRouteParams(
trustQuery
? parsedUrl.query
: dynamicRouteMatcher(parsedUrl.pathname)
)
`
: `const params = {};`
}
${
// Temporary work around: `x-now-route-matches` is a platform header
// _only_ set for `Prerender` requests. We should move this logic
// into our builder to ensure we're decoupled. However, this entails
// removing reliance on `req.url` and using `req.query` instead
// (which is needed for "custom routes" anyway).
pageIsDynamicRoute
? `const nowParams = req.headers && req.headers["x-now-route-matches"]
? getRouteMatcher(
(function() {
const { re, groups, routeKeys } = getRouteRegex("${page}");
return {
re: {
// Simulate a RegExp match from the \`req.url\` input
exec: str => {
const obj = parseQs(str);
// favor named matches if available
const routeKeyNames = Object.keys(routeKeys)
if (routeKeyNames.every(name => obj[name])) {
return routeKeyNames.reduce((prev, keyName) => {
const paramName = routeKeys[keyName]
prev[groups[paramName].pos] = obj[keyName]
return prev
}, {})
}
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
// make sure to normalize req.url on Vercel to strip dynamic params
// from the query which are added during routing
${
pageIsDynamicRoute
? `
if (trustQuery) {
const _parsedUrl = parseUrl(req.url, true)
delete _parsedUrl.search
for (const param of Object.keys(defaultRouteRegex.groups)) {
delete _parsedUrl.query[param]
}
req.url = formatUrl(_parsedUrl)
}
`
: ''
}
// normalize request URL/asPath for fallback/revalidate pages since the
// proxy sets the request URL to the output's path for fallback pages
${
pageIsDynamicRoute
? `
if (nowParams) {
const _parsedUrl = parseUrl(req.url)
for (const param of Object.keys(defaultRouteRegex.groups)) {
const paramIdx = _parsedUrl.pathname.indexOf(\`[\${param}]\`)
if (paramIdx > -1) {
_parsedUrl.pathname = _parsedUrl.pathname.substr(0, paramIdx) +
encodeURI(nowParams[param]) +
_parsedUrl.pathname.substr(paramIdx + param.length + 2)
}
}
parsedUrl.pathname = _parsedUrl.pathname
req.url = formatUrl(_parsedUrl)
}
`
: ``
}
// make sure to normalize asPath for revalidate and _next/data requests
// since the asPath should match what is shown on the client
if (
!fromExport &&
(getStaticProps || getServerSideProps)
) {
${
pageIsDynamicRoute
? `
// don't include dynamic route params in query while normalizing
// asPath
if (trustQuery) {
delete parsedUrl.search
for (const param of Object.keys(defaultRouteRegex.groups)) {
delete origQuery[param]
}
}
`
: ``
}
parsedUrl.pathname = denormalizePagePath(parsedUrl.pathname)
renderOpts.resolvedUrl = formatUrl({
...parsedUrl,
query: origQuery
})
// For getServerSideProps we need to ensure we use the original URL
// and not the resolved URL to prevent a hydration mismatch on asPath
renderOpts.resolvedAsPath = getServerSideProps
? formatUrl({
...parsedUrl,
pathname: routeNoAssetPath,
query: origQuery,
})
: renderOpts.resolvedUrl
}
const isFallback = parsedUrl.query.__nextFallback
const previewData = tryGetPreviewData(req, res, options.previewProps)
const isPreviewMode = previewData !== false
if (process.env.__NEXT_OPTIMIZE_FONTS) {
renderOpts.optimizeFonts = true
/**
* __webpack_require__.__NEXT_FONT_MANIFEST__ is added by
* font-stylesheet-gathering-plugin
*/
renderOpts.fontManifest = __webpack_require__.__NEXT_FONT_MANIFEST__;
process.env['__NEXT_OPTIMIZE_FONT'+'S'] = true
}
let result = await renderToHTML(req, res, "${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 = parseUrl(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) {
sendPayload(req, res, html, 'html', {generateEtags: ${JSON.stringify(
generateEtags === 'true'
)}, poweredByHeader: ${JSON.stringify(poweredByHeader === 'true')}})
}
} catch(err) {
console.error(err)
await onError(err)
// Throw the error to crash the serverless function
throw err
}
}
`
}
}
export default nextServerlessLoader