forked from vercel/next.js
/
index.ts
202 lines (179 loc) · 6.14 KB
/
index.ts
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import { stringifyRequest } from '../../stringify-request'
export default async function middlewareRSCLoader(this: any) {
const {
absolutePagePath,
absoluteAppPath,
absoluteDocumentPath,
basePath,
isServerComponent: isServerComponentQuery,
assetPrefix,
buildId,
} = this.getOptions()
const isServerComponent = isServerComponentQuery === 'true'
const stringifiedAbsolutePagePath = stringifyRequest(this, absolutePagePath)
const stringifiedAbsoluteAppPath = stringifyRequest(this, absoluteAppPath)
const stringifiedAbsoluteDocumentPath = stringifyRequest(
this,
absoluteDocumentPath
)
let appDefinition = `const App = require(${stringifiedAbsoluteAppPath}).default`
let documentDefinition = `const Document = require(${stringifiedAbsoluteDocumentPath}).default`
const transformed = `
import { adapter } from 'next/dist/server/web/adapter'
import { RouterContext } from 'next/dist/shared/lib/router-context'
import { renderToHTML } from 'next/dist/server/web/render'
import React, { createElement } from 'react'
${
isServerComponent
? `
import { renderToReadableStream } from 'next/dist/compiled/react-server-dom-webpack/writer.browser.server'
import { createFromReadableStream } from 'next/dist/compiled/react-server-dom-webpack'`
: ''
}
${appDefinition}
${documentDefinition}
const {
default: Page,
config,
getStaticProps,
getServerSideProps,
getStaticPaths
} = require(${stringifiedAbsolutePagePath})
const buildManifest = self.__BUILD_MANIFEST
const reactLoadableManifest = self.__REACT_LOADABLE_MANIFEST
const rscManifest = self.__RSC_MANIFEST
if (typeof Page !== 'function') {
throw new Error('Your page must export a \`default\` component')
}
function wrapReadable(readable) {
const encoder = new TextEncoder()
const transformStream = new TransformStream()
const writer = transformStream.writable.getWriter()
const reader = readable.getReader()
const process = () => {
reader.read().then(({ done, value }) => {
if (!done) {
writer.write(typeof value === 'string' ? encoder.encode(value) : value)
process()
} else {
writer.close()
}
})
}
process()
return transformStream.readable
}
${
isServerComponent
? `
const renderFlight = props => renderToReadableStream(createElement(Page, props), rscManifest)
let responseCache
const FlightWrapper = props => {
let response = responseCache
if (!response) {
responseCache = response = createFromReadableStream(renderFlight(props))
}
return response.readRoot()
}
const Component = props => {
return createElement(
React.Suspense,
{ fallback: null },
createElement(FlightWrapper, props)
)
}`
: `
const Component = Page`
}
async function render(request) {
const url = request.nextUrl
const query = Object.fromEntries(url.searchParams)
// Preflight request
if (request.method === 'HEAD') {
return new Response('OK.', {
headers: { 'x-middleware-ssr': '1' }
})
}
${
isServerComponent
? `
// Flight data request
const isFlightDataRequest = query.__flight__ !== undefined
if (isFlightDataRequest) {
delete query.__flight__
return new Response(
wrapReadable(
renderFlight({
router: {
route: url.pathname,
asPath: url.pathname,
pathname: url.pathname,
query,
}
})
)
)
}`
: ''
}
const renderOpts = {
Component,
pageConfig: config || {},
// Locales are not supported yet.
// locales: i18n?.locales,
// locale: detectedLocale,
// defaultLocale,
// domainLocales: i18n?.domains,
dev: process.env.NODE_ENV !== 'production',
App,
Document,
buildManifest,
getStaticProps,
getServerSideProps,
getStaticPaths,
reactLoadableManifest,
buildId: ${JSON.stringify(buildId)},
assetPrefix: ${JSON.stringify(assetPrefix || '')},
env: process.env,
basePath: ${JSON.stringify(basePath || '')},
supportsDynamicHTML: true,
concurrentFeatures: true,
renderServerComponent: ${isServerComponent ? 'true' : 'false'},
}
const transformStream = new TransformStream()
const writer = transformStream.writable.getWriter()
const encoder = new TextEncoder()
try {
const result = await renderToHTML(
{ url: url.pathname },
{},
url.pathname,
query,
renderOpts
)
result.pipe({
write: str => writer.write(encoder.encode(str)),
end: () => writer.close()
})
} catch (err) {
return new Response(
(err || 'An error occurred while rendering ' + url.pathname + '.').toString(),
{
status: 500,
headers: { 'x-middleware-ssr': '1' }
}
)
}
return new Response(transformStream.readable, {
headers: { 'x-middleware-ssr': '1' }
})
}
export default function rscMiddleware(opts) {
return adapter({
...opts,
handler: render
})
}
`
return transformed
}