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app-render.tsx
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app-render.tsx
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import type { IncomingHttpHeaders, IncomingMessage, ServerResponse } from 'http'
import type { LoadComponentsReturnType } from './load-components'
import type { ServerRuntime } from '../types'
import type { FontLoaderManifest } from '../build/webpack/plugins/font-loader-manifest-plugin'
// Import builtin react directly to avoid require cache conflicts
import React, { use } from 'next/dist/compiled/react'
import { NotFound as DefaultNotFound } from '../client/components/error'
// this needs to be required lazily so that `next-server` can set
// the env before we require
import ReactDOMServer from 'next/dist/compiled/react-dom/server.browser'
import { ParsedUrlQuery } from 'querystring'
import { NextParsedUrlQuery } from './request-meta'
import RenderResult from './render-result'
import {
readableStreamTee,
encodeText,
decodeText,
renderToInitialStream,
createBufferedTransformStream,
continueFromInitialStream,
streamToString,
} from './node-web-streams-helper'
import { ESCAPE_REGEX, htmlEscapeJsonString } from './htmlescape'
import { matchSegment } from '../client/components/match-segments'
import {
FlightCSSManifest,
FlightManifest,
} from '../build/webpack/plugins/flight-manifest-plugin'
import { ServerInsertedHTMLContext } from '../shared/lib/server-inserted-html'
import { stripInternalQueries } from './internal-utils'
import type { ComponentsType } from '../build/webpack/loaders/next-app-loader'
import { REDIRECT_ERROR_CODE } from '../client/components/redirect'
import { RequestCookies } from './web/spec-extension/cookies'
import { DYNAMIC_ERROR_CODE } from '../client/components/hooks-server-context'
import { NOT_FOUND_ERROR_CODE } from '../client/components/not-found'
import { NEXT_DYNAMIC_NO_SSR_CODE } from '../shared/lib/no-ssr-error'
import { HeadManagerContext } from '../shared/lib/head-manager-context'
import { Writable } from 'stream'
import stringHash from 'next/dist/compiled/string-hash'
import {
NEXT_ROUTER_PREFETCH,
NEXT_ROUTER_STATE_TREE,
RSC,
FLIGHT_PARAMETERS,
} from '../client/components/app-router-headers'
import type { StaticGenerationStore } from '../client/components/static-generation-async-storage'
import { DefaultHead } from '../client/components/head'
const isEdgeRuntime = process.env.NEXT_RUNTIME === 'edge'
function preloadComponent(Component: any, props: any) {
const prev = console.error
// Hide invalid hook call warning when calling component
console.error = function (msg) {
if (msg.startsWith('Invalid hook call..')) {
// ignore
} else {
// @ts-expect-error argument is defined
prev.apply(console, arguments)
}
}
try {
let result = Component(props)
if (result && typeof result.then === 'function') {
// Catch promise rejections to prevent unhandledRejection errors
result.then(
() => {},
() => {}
)
}
return function () {
// We know what this component will render already.
return result
}
} catch (x) {
// something suspended or errored, try again later
} finally {
console.error = prev
}
return Component
}
const CACHE_ONE_YEAR = 31536000
const INTERNAL_HEADERS_INSTANCE = Symbol('internal for headers readonly')
function readonlyHeadersError() {
return new Error('ReadonlyHeaders cannot be modified')
}
export class ReadonlyHeaders {
[INTERNAL_HEADERS_INSTANCE]: Headers
entries: Headers['entries']
forEach: Headers['forEach']
get: Headers['get']
has: Headers['has']
keys: Headers['keys']
values: Headers['values']
constructor(headers: IncomingHttpHeaders) {
// Since `new Headers` uses `this.append()` to fill the headers object ReadonlyHeaders can't extend from Headers directly as it would throw.
const headersInstance = new Headers(headers as any)
this[INTERNAL_HEADERS_INSTANCE] = headersInstance
this.entries = headersInstance.entries.bind(headersInstance)
this.forEach = headersInstance.forEach.bind(headersInstance)
this.get = headersInstance.get.bind(headersInstance)
this.has = headersInstance.has.bind(headersInstance)
this.keys = headersInstance.keys.bind(headersInstance)
this.values = headersInstance.values.bind(headersInstance)
}
[Symbol.iterator]() {
return this[INTERNAL_HEADERS_INSTANCE][Symbol.iterator]()
}
append() {
throw readonlyHeadersError()
}
delete() {
throw readonlyHeadersError()
}
set() {
throw readonlyHeadersError()
}
}
const INTERNAL_COOKIES_INSTANCE = Symbol('internal for cookies readonly')
class ReadonlyRequestCookiesError extends Error {
message =
'ReadonlyRequestCookies cannot be modified. Read more: https://nextjs.org/api-reference/cookies'
}
export class ReadonlyRequestCookies {
[INTERNAL_COOKIES_INSTANCE]: RequestCookies
get: RequestCookies['get']
getAll: RequestCookies['getAll']
has: RequestCookies['has']
constructor(request: {
headers: {
get(key: 'cookie'): string | null | undefined
}
}) {
// Since `new Headers` uses `this.append()` to fill the headers object ReadonlyHeaders can't extend from Headers directly as it would throw.
// Request overridden to not have to provide a fully request object.
const cookiesInstance = new RequestCookies(request.headers as Headers)
this[INTERNAL_COOKIES_INSTANCE] = cookiesInstance
this.get = cookiesInstance.get.bind(cookiesInstance)
this.getAll = cookiesInstance.getAll.bind(cookiesInstance)
this.has = cookiesInstance.has.bind(cookiesInstance)
}
[Symbol.iterator]() {
return (this[INTERNAL_COOKIES_INSTANCE] as any)[Symbol.iterator]()
}
clear() {
throw new ReadonlyRequestCookiesError()
}
delete() {
throw new ReadonlyRequestCookiesError()
}
set() {
throw new ReadonlyRequestCookiesError()
}
}
export type RenderOptsPartial = {
err?: Error | null
dev?: boolean
serverComponentManifest?: FlightManifest
serverCSSManifest?: FlightCSSManifest
supportsDynamicHTML?: boolean
runtime?: ServerRuntime
serverComponents?: boolean
assetPrefix?: string
fontLoaderManifest?: FontLoaderManifest
isBot?: boolean
incrementalCache?: import('./lib/incremental-cache').IncrementalCache
isRevalidate?: boolean
}
export type RenderOpts = LoadComponentsReturnType & RenderOptsPartial
/**
* Flight Response is always set to application/octet-stream to ensure it does not get interpreted as HTML.
*/
class FlightRenderResult extends RenderResult {
constructor(response: string | ReadableStream<Uint8Array>) {
super(response, { contentType: 'application/octet-stream' })
}
}
/**
* Interop between "export default" and "module.exports".
*/
function interopDefault(mod: any) {
return mod.default || mod
}
// tolerate dynamic server errors during prerendering so console
// isn't spammed with unactionable errors
/**
* Create error handler for renderers.
*/
function createErrorHandler(
/**
* Used for debugging
*/
_source: string,
capturedErrors: Error[],
allCapturedErrors?: Error[]
) {
return (err: any): string => {
if (allCapturedErrors) allCapturedErrors.push(err)
if (
err &&
(err.digest === DYNAMIC_ERROR_CODE ||
err.digest === NOT_FOUND_ERROR_CODE ||
err.digest === NEXT_DYNAMIC_NO_SSR_CODE ||
err.digest?.startsWith(REDIRECT_ERROR_CODE))
) {
return err.digest
}
// Used for debugging error source
// console.error(_source, err)
console.error(err)
capturedErrors.push(err)
// TODO-APP: look at using webcrypto instead. Requires a promise to be awaited.
return stringHash(err.message + err.stack + (err.digest || '')).toString()
}
}
let isFetchPatched = false
// we patch fetch to collect cache information used for
// determining if a page is static or not
function patchFetch(ComponentMod: any) {
if (isFetchPatched) return
isFetchPatched = true
const { DynamicServerError } =
ComponentMod.serverHooks as typeof import('../client/components/hooks-server-context')
const staticGenerationAsyncStorage = ComponentMod.staticGenerationAsyncStorage
const originFetch = globalThis.fetch
globalThis.fetch = async (input, init) => {
const staticGenerationStore =
('getStore' in staticGenerationAsyncStorage
? staticGenerationAsyncStorage.getStore()
: staticGenerationAsyncStorage) || {}
const {
isStaticGeneration,
fetchRevalidate,
pathname,
incrementalCache,
isRevalidate,
} = (staticGenerationStore || {}) as StaticGenerationStore
let revalidate: number | undefined | boolean
if (typeof init?.next?.revalidate === 'number') {
revalidate = init.next.revalidate
}
if (init?.next?.revalidate === false) {
revalidate = CACHE_ONE_YEAR
}
if (
!staticGenerationStore.fetchRevalidate ||
(typeof revalidate === 'number' &&
revalidate < staticGenerationStore.fetchRevalidate)
) {
staticGenerationStore.fetchRevalidate = revalidate
}
let cacheKey: string | undefined
const doOriginalFetch = async () => {
return originFetch(input, init).then(async (res) => {
if (
incrementalCache &&
cacheKey &&
typeof revalidate === 'number' &&
revalidate > 0
) {
const clonedRes = res.clone()
let base64Body = ''
if (process.env.NEXT_RUNTIME === 'edge') {
let string = ''
new Uint8Array(await clonedRes.arrayBuffer()).forEach((byte) => {
string += String.fromCharCode(byte)
})
base64Body = btoa(string)
} else {
base64Body = Buffer.from(await clonedRes.arrayBuffer()).toString(
'base64'
)
}
await incrementalCache.set(
cacheKey,
{
kind: 'FETCH',
isStale: false,
age: 0,
data: {
headers: Object.fromEntries(clonedRes.headers.entries()),
body: base64Body,
},
revalidate,
},
revalidate,
true
)
}
return res
})
}
if (incrementalCache && typeof revalidate === 'number' && revalidate > 0) {
cacheKey = await incrementalCache?.fetchCacheKey(input.toString(), init)
const entry = await incrementalCache.get(cacheKey, true)
if (entry?.value && entry.value.kind === 'FETCH') {
// when stale and is revalidating we wait for fresh data
// so the revalidated entry has the updated data
if (!isRevalidate || !entry.isStale) {
if (entry.isStale) {
if (!staticGenerationStore.pendingRevalidates) {
staticGenerationStore.pendingRevalidates = []
}
staticGenerationStore.pendingRevalidates.push(
doOriginalFetch().catch(console.error)
)
}
const resData = entry.value.data
let decodedBody = ''
// TODO: handle non-text response bodies
if (process.env.NEXT_RUNTIME === 'edge') {
decodedBody = atob(resData.body)
} else {
decodedBody = Buffer.from(resData.body, 'base64').toString()
}
return new Response(decodedBody, {
headers: resData.headers,
status: resData.status,
})
}
}
}
if (staticGenerationStore && isStaticGeneration) {
if (init && typeof init === 'object') {
const cache = init.cache
// Delete `cache` property as Cloudflare Workers will throw an error
if (isEdgeRuntime) {
delete init.cache
}
if (cache === 'no-store') {
staticGenerationStore.fetchRevalidate = 0
// TODO: ensure this error isn't logged to the user
// seems it's slipping through currently
throw new DynamicServerError(
`no-store fetch ${input}${pathname ? ` ${pathname}` : ''}`
)
}
const hasNextConfig = 'next' in init
const next = init.next || {}
if (
typeof next.revalidate === 'number' &&
(typeof fetchRevalidate === 'undefined' ||
next.revalidate < fetchRevalidate)
) {
const forceDynamic = staticGenerationStore.forceDynamic
if (!forceDynamic || next.revalidate !== 0) {
staticGenerationStore.fetchRevalidate = next.revalidate
}
if (!forceDynamic && next.revalidate === 0) {
throw new DynamicServerError(
`revalidate: ${next.revalidate} fetch ${input}${
pathname ? ` ${pathname}` : ''
}`
)
}
}
if (hasNextConfig) delete init.next
}
}
return doOriginalFetch()
}
}
interface FlightResponseRef {
current: Promise<JSX.Element> | null
}
/**
* Render Flight stream.
* This is only used for renderToHTML, the Flight response does not need additional wrappers.
*/
function useFlightResponse(
writable: WritableStream<Uint8Array>,
req: ReadableStream<Uint8Array>,
serverComponentManifest: any,
rscChunks: Uint8Array[],
flightResponseRef: FlightResponseRef,
nonce?: string
): Promise<JSX.Element> {
if (flightResponseRef.current !== null) {
return flightResponseRef.current
}
const {
createFromReadableStream,
} = require('next/dist/compiled/react-server-dom-webpack/client')
const [renderStream, forwardStream] = readableStreamTee(req)
const res = createFromReadableStream(renderStream, {
moduleMap: isEdgeRuntime
? serverComponentManifest.__edge_ssr_module_mapping__
: serverComponentManifest.__ssr_module_mapping__,
})
flightResponseRef.current = res
let bootstrapped = false
// We only attach CSS chunks to the inlined data.
const forwardReader = forwardStream.getReader()
const writer = writable.getWriter()
const startScriptTag = nonce
? `<script nonce=${JSON.stringify(nonce)}>`
: '<script>'
function read() {
forwardReader.read().then(({ done, value }) => {
if (value) {
rscChunks.push(value)
}
if (!bootstrapped) {
bootstrapped = true
writer.write(
encodeText(
`${startScriptTag}(self.__next_f=self.__next_f||[]).push(${htmlEscapeJsonString(
JSON.stringify([0])
)})</script>`
)
)
}
if (done) {
flightResponseRef.current = null
writer.close()
} else {
const responsePartial = decodeText(value)
const scripts = `${startScriptTag}self.__next_f.push(${htmlEscapeJsonString(
JSON.stringify([1, responsePartial])
)})</script>`
writer.write(encodeText(scripts))
read()
}
})
}
read()
return res
}
/**
* Create a component that renders the Flight stream.
* This is only used for renderToHTML, the Flight response does not need additional wrappers.
*/
function createServerComponentRenderer(
ComponentToRender: any,
ComponentMod: {
renderToReadableStream: any
__next_app_webpack_require__?: any
},
{
transformStream,
serverComponentManifest,
serverContexts,
rscChunks,
}: {
transformStream: TransformStream<Uint8Array, Uint8Array>
serverComponentManifest: NonNullable<RenderOpts['serverComponentManifest']>
serverContexts: Array<
[ServerContextName: string, JSONValue: Object | number | string]
>
rscChunks: Uint8Array[]
},
serverComponentsErrorHandler: ReturnType<typeof createErrorHandler>,
nonce?: string
): () => JSX.Element {
// We need to expose the `__webpack_require__` API globally for
// react-server-dom-webpack. This is a hack until we find a better way.
if (ComponentMod.__next_app_webpack_require__) {
// @ts-ignore
globalThis.__next_require__ = ComponentMod.__next_app_webpack_require__
// @ts-ignore
globalThis.__next_chunk_load__ = () => Promise.resolve()
}
let RSCStream: ReadableStream<Uint8Array>
const createRSCStream = () => {
if (!RSCStream) {
RSCStream = ComponentMod.renderToReadableStream(
<ComponentToRender />,
serverComponentManifest,
{
context: serverContexts,
onError: serverComponentsErrorHandler,
}
)
}
return RSCStream
}
const flightResponseRef: FlightResponseRef = { current: null }
const writable = transformStream.writable
return function ServerComponentWrapper(): JSX.Element {
const reqStream = createRSCStream()
const response = useFlightResponse(
writable,
reqStream,
serverComponentManifest,
rscChunks,
flightResponseRef,
nonce
)
return use(response)
}
}
type DynamicParamTypes = 'catchall' | 'optional-catchall' | 'dynamic'
// c = catchall
// oc = optional catchall
// d = dynamic
export type DynamicParamTypesShort = 'c' | 'oc' | 'd'
/**
* Shorten the dynamic param in order to make it smaller when transmitted to the browser.
*/
function getShortDynamicParamType(
type: DynamicParamTypes
): DynamicParamTypesShort {
switch (type) {
case 'catchall':
return 'c'
case 'optional-catchall':
return 'oc'
case 'dynamic':
return 'd'
default:
throw new Error('Unknown dynamic param type')
}
}
/**
* Segment in the router state.
*/
export type Segment =
| string
| [param: string, value: string, type: DynamicParamTypesShort]
/**
* LoaderTree is generated in next-app-loader.
*/
type LoaderTree = [
segment: string,
parallelRoutes: { [parallelRouterKey: string]: LoaderTree },
components: ComponentsType
]
/**
* Router state
*/
export type FlightRouterState = [
segment: Segment,
parallelRoutes: { [parallelRouterKey: string]: FlightRouterState },
url?: string,
refresh?: 'refetch',
isRootLayout?: boolean
]
/**
* Individual Flight response path
*/
export type FlightSegmentPath =
// Uses `any` as repeating pattern can't be typed.
| any[]
// Looks somewhat like this
| [
segment: Segment,
parallelRouterKey: string,
segment: Segment,
parallelRouterKey: string,
segment: Segment,
parallelRouterKey: string
]
export type FlightDataPath =
// Uses `any` as repeating pattern can't be typed.
| any[]
// Looks somewhat like this
| [
// Holds full path to the segment.
...FlightSegmentPath[],
/* segment of the rendered slice: */ Segment,
/* treePatch */ FlightRouterState,
/* subTreeData: */ React.ReactNode | null, // Can be null during prefetch if there's no loading component
/* head */ React.ReactNode | null
]
/**
* The Flight response data
*/
export type FlightData = Array<FlightDataPath> | string
/**
* Property holding the current subTreeData.
*/
export type ChildProp = {
/**
* Null indicates that the tree is partial
*/
current: React.ReactNode | null
segment: Segment
}
/**
* Parse dynamic route segment to type of parameter
*/
function getSegmentParam(segment: string): {
param: string
type: DynamicParamTypes
} | null {
if (segment.startsWith('[[...') && segment.endsWith(']]')) {
return {
type: 'optional-catchall',
param: segment.slice(5, -2),
}
}
if (segment.startsWith('[...') && segment.endsWith(']')) {
return {
type: 'catchall',
param: segment.slice(4, -1),
}
}
if (segment.startsWith('[') && segment.endsWith(']')) {
return {
type: 'dynamic',
param: segment.slice(1, -1),
}
}
return null
}
/**
* Get inline <link> tags based on server CSS manifest. Only used when rendering to HTML.
*/
function getCssInlinedLinkTags(
serverComponentManifest: FlightManifest,
serverCSSManifest: FlightCSSManifest,
filePath: string,
serverCSSForEntries: string[]
): string[] {
const layoutOrPageCss =
serverCSSManifest[filePath] ||
serverComponentManifest.__client_css_manifest__?.[filePath]
if (!layoutOrPageCss) {
return []
}
const chunks = new Set<string>()
for (const css of layoutOrPageCss) {
// We only include the CSS if it's a global CSS, or it is used by this
// entrypoint.
if (serverCSSForEntries.includes(css) || !/\.module\.css/.test(css)) {
const mod = serverComponentManifest[css]
if (mod) {
for (const chunk of mod.default.chunks) {
chunks.add(chunk)
}
}
}
}
return [...chunks]
}
function getServerCSSForEntries(
serverCSSManifest: FlightCSSManifest,
entries: string[]
) {
const css = []
for (const entry of entries) {
const entryName = entry.replace(/\.[^.]+$/, '')
if (
serverCSSManifest.__entry_css__ &&
serverCSSManifest.__entry_css__[entryName]
) {
css.push(...serverCSSManifest.__entry_css__[entryName])
}
}
return css
}
/**
* Get inline <link rel="preload" as="font"> tags based on server CSS manifest and font loader manifest. Only used when rendering to HTML.
*/
function getPreloadedFontFilesInlineLinkTags(
serverComponentManifest: FlightManifest,
serverCSSManifest: FlightCSSManifest,
fontLoaderManifest: FontLoaderManifest | undefined,
serverCSSForEntries: string[],
filePath?: string
): string[] {
if (!fontLoaderManifest || !filePath) {
return []
}
const layoutOrPageCss =
serverCSSManifest[filePath] ||
serverComponentManifest.__client_css_manifest__?.[filePath]
if (!layoutOrPageCss) {
return []
}
const fontFiles = new Set<string>()
for (const css of layoutOrPageCss) {
// We only include the CSS if it is used by this entrypoint.
if (serverCSSForEntries.includes(css)) {
const preloadedFontFiles = fontLoaderManifest.app[css]
if (preloadedFontFiles) {
for (const fontFile of preloadedFontFiles) {
fontFiles.add(fontFile)
}
}
}
}
return [...fontFiles]
}
function getScriptNonceFromHeader(cspHeaderValue: string): string | undefined {
const directives = cspHeaderValue
// Directives are split by ';'.
.split(';')
.map((directive) => directive.trim())
// First try to find the directive for the 'script-src', otherwise try to
// fallback to the 'default-src'.
const directive =
directives.find((dir) => dir.startsWith('script-src')) ||
directives.find((dir) => dir.startsWith('default-src'))
// If no directive could be found, then we're done.
if (!directive) {
return
}
// Extract the nonce from the directive
const nonce = directive
.split(' ')
// Remove the 'strict-src'/'default-src' string, this can't be the nonce.
.slice(1)
.map((source) => source.trim())
// Find the first source with the 'nonce-' prefix.
.find(
(source) =>
source.startsWith("'nonce-") &&
source.length > 8 &&
source.endsWith("'")
)
// Grab the nonce by trimming the 'nonce-' prefix.
?.slice(7, -1)
// If we could't find the nonce, then we're done.
if (!nonce) {
return
}
// Don't accept the nonce value if it contains HTML escape characters.
// Technically, the spec requires a base64'd value, but this is just an
// extra layer.
if (ESCAPE_REGEX.test(nonce)) {
throw new Error(
'Nonce value from Content-Security-Policy contained HTML escape characters.\nLearn more: https://nextjs.org/docs/messages/nonce-contained-invalid-characters'
)
}
return nonce
}
function headersWithoutFlight(headers: IncomingHttpHeaders) {
const newHeaders = { ...headers }
for (const param of FLIGHT_PARAMETERS) {
delete newHeaders[param.toString().toLowerCase()]
}
return newHeaders
}
async function renderToString(element: React.ReactElement) {
const renderStream = await ReactDOMServer.renderToReadableStream(element)
await renderStream.allReady
return streamToString(renderStream)
}
export async function renderToHTMLOrFlight(
req: IncomingMessage,
res: ServerResponse,
pathname: string,
query: NextParsedUrlQuery,
renderOpts: RenderOpts
): Promise<RenderResult | null> {
/**
* Rules of Static & Dynamic HTML:
*
* 1.) We must generate static HTML unless the caller explicitly opts
* in to dynamic HTML support.
*
* 2.) If dynamic HTML support is requested, we must honor that request
* or throw an error. It is the sole responsibility of the caller to
* ensure they aren't e.g. requesting dynamic HTML for an AMP page.
*
* These rules help ensure that other existing features like request caching,
* coalescing, and ISR continue working as intended.
*/
const isStaticGeneration =
renderOpts.supportsDynamicHTML !== true && !renderOpts.isBot
const isFlight = req.headers[RSC.toLowerCase()] !== undefined
const capturedErrors: Error[] = []
const allCapturedErrors: Error[] = []
const serverComponentsErrorHandler = createErrorHandler(
'serverComponentsRenderer',
capturedErrors
)
const flightDataRendererErrorHandler = createErrorHandler(
'flightDataRenderer',
capturedErrors
)
const htmlRendererErrorHandler = createErrorHandler(
'htmlRenderer',
capturedErrors,
allCapturedErrors
)
const {
buildManifest,
subresourceIntegrityManifest,
serverComponentManifest,
serverCSSManifest = {},
ComponentMod,
dev,
fontLoaderManifest,
supportsDynamicHTML,
} = renderOpts
patchFetch(ComponentMod)
const generateStaticHTML = supportsDynamicHTML !== true
const staticGenerationAsyncStorage = ComponentMod.staticGenerationAsyncStorage
const requestAsyncStorage = ComponentMod.requestAsyncStorage
if (
staticGenerationAsyncStorage &&
!('getStore' in staticGenerationAsyncStorage) &&
staticGenerationAsyncStorage.inUse
) {
throw new Error(
`Invariant: A separate worker must be used for each render when AsyncLocalStorage is not available`
)
}
// we wrap the render in an AsyncLocalStorage context
const wrappedRender = async () => {
const staticGenerationStore: StaticGenerationStore =
'getStore' in staticGenerationAsyncStorage
? staticGenerationAsyncStorage.getStore()
: staticGenerationAsyncStorage
// don't modify original query object
query = Object.assign({}, query)
const isPrefetch =
req.headers[NEXT_ROUTER_PREFETCH.toLowerCase()] !== undefined
// TODO-APP: verify the tree is valid
// TODO-APP: verify query param is single value (not an array)
// TODO-APP: verify tree can't grow out of control
/**
* Router state provided from the client-side router. Used to handle rendering from the common layout down.
*/
let providedFlightRouterState: FlightRouterState = isFlight
? req.headers[NEXT_ROUTER_STATE_TREE.toLowerCase()]
? JSON.parse(
req.headers[NEXT_ROUTER_STATE_TREE.toLowerCase()] as string
)
: undefined
: undefined
/**
* The tree created in next-app-loader that holds component segments and modules
*/
const loaderTree: LoaderTree = ComponentMod.tree
stripInternalQueries(query)
const LayoutRouter =
ComponentMod.LayoutRouter as typeof import('../client/components/layout-router').default
const RenderFromTemplateContext =
ComponentMod.RenderFromTemplateContext as typeof import('../client/components/render-from-template-context').default
/**
* Server Context is specifically only available in Server Components.
* It has to hold values that can't change while rendering from the common layout down.
* An example of this would be that `headers` are available but `searchParams` are not because that'd mean we have to render from the root layout down on all requests.
*/
const serverContexts: Array<[string, any]> = [
['WORKAROUND', null], // TODO-APP: First value has a bug currently where the value is not set on the second request: https://github.com/facebook/react/issues/24849
]
type CreateSegmentPath = (child: FlightSegmentPath) => FlightSegmentPath
/**
* Dynamic parameters. E.g. when you visit `/dashboard/vercel` which is rendered by `/dashboard/[slug]` the value will be {"slug": "vercel"}.
*/
const pathParams = (renderOpts as any).params as ParsedUrlQuery
/**
* Parse the dynamic segment and return the associated value.
*/
const getDynamicParamFromSegment = (
// [slug] / [[slug]] / [...slug]
segment: string
): {
param: string
value: string | string[] | null
treeSegment: Segment
type: DynamicParamTypesShort
} | null => {
const segmentParam = getSegmentParam(segment)
if (!segmentParam) {
return null
}
const key = segmentParam.param
let value = pathParams[key]
if (Array.isArray(value)) {
value = value.map((i) => encodeURIComponent(i))
} else if (typeof value === 'string') {
value = encodeURIComponent(value)
}
if (!value) {
// Handle case where optional catchall does not have a value, e.g. `/dashboard/[...slug]` when requesting `/dashboard`
if (segmentParam.type === 'optional-catchall') {
const type = getShortDynamicParamType(segmentParam.type)
return {
param: key,
value: null,
type: type,
// This value always has to be a string.
treeSegment: [key, '', type],
}
}
return null
}
const type = getShortDynamicParamType(segmentParam.type)
return {
param: key,