forked from vercel/next.js
/
router.ts
426 lines (381 loc) · 12 KB
/
router.ts
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import type { NextConfig } from './config'
import type { ParsedUrlQuery } from 'querystring'
import type { BaseNextRequest, BaseNextResponse } from './base-http'
import type {
RouteMatch,
Params,
} from '../shared/lib/router/utils/route-matcher'
import type { RouteHas } from '../lib/load-custom-routes'
import { getNextInternalQuery, NextUrlWithParsedQuery } from './request-meta'
import { getPathMatch } from '../shared/lib/router/utils/path-match'
import { removeTrailingSlash } from '../shared/lib/router/utils/remove-trailing-slash'
import { normalizeLocalePath } from '../shared/lib/i18n/normalize-locale-path'
import { matchHas } from '../shared/lib/router/utils/prepare-destination'
import { removePathPrefix } from '../shared/lib/router/utils/remove-path-prefix'
import { getRequestMeta } from './request-meta'
import { formatNextPathnameInfo } from '../shared/lib/router/utils/format-next-pathname-info'
import { getNextPathnameInfo } from '../shared/lib/router/utils/get-next-pathname-info'
type RouteResult = {
finished: boolean
pathname?: string
query?: ParsedUrlQuery
}
export type Route = {
match: RouteMatch
has?: RouteHas[]
type: string
check?: boolean
statusCode?: number
name: string
matchesBasePath?: true
matchesLocale?: true
matchesLocaleAPIRoutes?: true
matchesTrailingSlash?: true
internal?: true
fn: (
req: BaseNextRequest,
res: BaseNextResponse,
params: Params,
parsedUrl: NextUrlWithParsedQuery
) => Promise<RouteResult> | RouteResult
}
export type DynamicRoutes = Array<{ page: string; match: RouteMatch }>
export type PageChecker = (pathname: string) => Promise<boolean>
export default class Router {
headers: Route[]
fsRoutes: Route[]
redirects: Route[]
rewrites: {
beforeFiles: Route[]
afterFiles: Route[]
fallback: Route[]
}
catchAllRoute: Route
catchAllMiddleware: Route[]
pageChecker: PageChecker
dynamicRoutes: DynamicRoutes
useFileSystemPublicRoutes: boolean
seenRequests: Set<any>
nextConfig: NextConfig
constructor({
headers = [],
fsRoutes = [],
rewrites = {
beforeFiles: [],
afterFiles: [],
fallback: [],
},
redirects = [],
catchAllRoute,
catchAllMiddleware = [],
dynamicRoutes = [],
pageChecker,
useFileSystemPublicRoutes,
nextConfig,
}: {
headers: Route[]
fsRoutes: Route[]
rewrites: {
beforeFiles: Route[]
afterFiles: Route[]
fallback: Route[]
}
redirects: Route[]
catchAllRoute: Route
catchAllMiddleware: Route[]
dynamicRoutes: DynamicRoutes | undefined
pageChecker: PageChecker
useFileSystemPublicRoutes: boolean
nextConfig: NextConfig
}) {
this.nextConfig = nextConfig
this.headers = headers
this.fsRoutes = fsRoutes
this.rewrites = rewrites
this.redirects = redirects
this.pageChecker = pageChecker
this.catchAllRoute = catchAllRoute
this.catchAllMiddleware = catchAllMiddleware
this.dynamicRoutes = dynamicRoutes
this.useFileSystemPublicRoutes = useFileSystemPublicRoutes
this.seenRequests = new Set()
}
get locales() {
return this.nextConfig.i18n?.locales || []
}
get basePath() {
return this.nextConfig.basePath || ''
}
setDynamicRoutes(routes: DynamicRoutes = []) {
this.dynamicRoutes = routes
}
setCatchallMiddleware(route?: Route[]) {
this.catchAllMiddleware = route || []
}
addFsRoute(fsRoute: Route) {
this.fsRoutes.unshift(fsRoute)
}
async execute(
req: BaseNextRequest,
res: BaseNextResponse,
parsedUrl: NextUrlWithParsedQuery
): Promise<boolean> {
if (this.seenRequests.has(req)) {
throw new Error(
`Invariant: request has already been processed: ${req.url}, this is an internal error please open an issue.`
)
}
this.seenRequests.add(req)
try {
// memoize page check calls so we don't duplicate checks for pages
const pageChecks: { [name: string]: Promise<boolean> } = {}
const memoizedPageChecker = async (p: string): Promise<boolean> => {
p = normalizeLocalePath(p, this.locales).pathname
if (pageChecks[p] !== undefined) {
return pageChecks[p]
}
const result = this.pageChecker(p)
pageChecks[p] = result
return result
}
let parsedUrlUpdated = parsedUrl
const applyCheckTrue = async (checkParsedUrl: NextUrlWithParsedQuery) => {
const originalFsPathname = checkParsedUrl.pathname
const fsPathname = removePathPrefix(originalFsPathname!, this.basePath)
for (const fsRoute of this.fsRoutes) {
const fsParams = fsRoute.match(fsPathname)
if (fsParams) {
checkParsedUrl.pathname = fsPathname
const fsResult = await fsRoute.fn(
req,
res,
fsParams,
checkParsedUrl
)
if (fsResult.finished) {
return true
}
checkParsedUrl.pathname = originalFsPathname
}
}
let matchedPage = await memoizedPageChecker(fsPathname)
// If we didn't match a page check dynamic routes
if (!matchedPage) {
const normalizedFsPathname = normalizeLocalePath(
fsPathname,
this.locales
).pathname
for (const dynamicRoute of this.dynamicRoutes) {
if (dynamicRoute.match(normalizedFsPathname)) {
matchedPage = true
}
}
}
// Matched a page or dynamic route so render it using catchAllRoute
if (matchedPage) {
const pageParams = this.catchAllRoute.match(checkParsedUrl.pathname)
checkParsedUrl.pathname = fsPathname
checkParsedUrl.query._nextBubbleNoFallback = '1'
const result = await this.catchAllRoute.fn(
req,
res,
pageParams as Params,
checkParsedUrl
)
return result.finished
}
}
/*
Desired routes order
- headers
- redirects
- Check filesystem (including pages), if nothing found continue
- User rewrites (checking filesystem and pages each match)
*/
const [middlewareCatchAllRoute, edgeSSRCatchAllRoute] =
this.catchAllMiddleware
const allRoutes = [
...(middlewareCatchAllRoute
? this.fsRoutes
.filter((r) => r.name === '_next/data catchall')
.map((r) => {
return {
...r,
check: false,
}
})
: []),
...this.headers,
...this.redirects,
...(this.useFileSystemPublicRoutes && middlewareCatchAllRoute
? [middlewareCatchAllRoute]
: []),
...this.rewrites.beforeFiles,
...this.fsRoutes,
// We only check the catch-all route if public page routes hasn't been
// disabled
...(this.useFileSystemPublicRoutes
? [
...(edgeSSRCatchAllRoute ? [edgeSSRCatchAllRoute] : []),
{
type: 'route',
name: 'page checker',
match: getPathMatch('/:path*'),
fn: async (
checkerReq,
checkerRes,
params,
parsedCheckerUrl
) => {
let { pathname } = parsedCheckerUrl
pathname = removeTrailingSlash(pathname || '/')
if (!pathname) {
return { finished: false }
}
if (await memoizedPageChecker(pathname)) {
return this.catchAllRoute.fn(
checkerReq,
checkerRes,
params,
parsedCheckerUrl
)
}
return { finished: false }
},
} as Route,
]
: []),
...this.rewrites.afterFiles,
...(this.rewrites.fallback.length
? [
{
type: 'route',
name: 'dynamic route/page check',
match: getPathMatch('/:path*'),
fn: async (
_checkerReq,
_checkerRes,
_params,
parsedCheckerUrl
) => {
return {
finished: await applyCheckTrue(parsedCheckerUrl),
}
},
} as Route,
...this.rewrites.fallback,
]
: []),
// We only check the catch-all route if public page routes hasn't been
// disabled
...(this.useFileSystemPublicRoutes
? [
...(edgeSSRCatchAllRoute ? [edgeSSRCatchAllRoute] : []),
this.catchAllRoute,
]
: []),
]
for (const testRoute of allRoutes) {
const originalPathname = parsedUrlUpdated.pathname as string
const pathnameInfo = getNextPathnameInfo(originalPathname, {
nextConfig: this.nextConfig,
parseData: false,
})
if (
pathnameInfo.locale &&
!testRoute.matchesLocaleAPIRoutes &&
pathnameInfo.pathname.match(/^\/api(?:\/|$)/)
) {
continue
}
if (getRequestMeta(req, '_nextHadBasePath')) {
pathnameInfo.basePath = this.basePath
}
const basePath = pathnameInfo.basePath
if (!testRoute.matchesBasePath) {
pathnameInfo.basePath = ''
}
if (
testRoute.matchesLocale &&
parsedUrl.query.__nextLocale &&
!pathnameInfo.locale
) {
pathnameInfo.locale = parsedUrl.query.__nextLocale
}
if (
!testRoute.matchesLocale &&
pathnameInfo.locale === this.nextConfig.i18n?.defaultLocale &&
pathnameInfo.locale
) {
pathnameInfo.locale = undefined
}
if (
testRoute.matchesTrailingSlash &&
getRequestMeta(req, '__nextHadTrailingSlash')
) {
pathnameInfo.trailingSlash = true
}
const matchPathname = formatNextPathnameInfo({
ignorePrefix: true,
...pathnameInfo,
})
let newParams = testRoute.match(matchPathname)
if (testRoute.has && newParams) {
const hasParams = matchHas(req, testRoute.has, parsedUrlUpdated.query)
if (hasParams) {
Object.assign(newParams, hasParams)
} else {
newParams = false
}
}
/**
* If it is a matcher that doesn't match the basePath (like the public
* directory) but Next.js is configured to use a basePath that was
* never there, we consider this an invalid match and keep routing.
*/
if (
newParams &&
this.basePath &&
!testRoute.matchesBasePath &&
!getRequestMeta(req, '_nextDidRewrite') &&
!basePath
) {
continue
}
if (newParams) {
parsedUrlUpdated.pathname = matchPathname
const result = await testRoute.fn(
req,
res,
newParams,
parsedUrlUpdated
)
if (result.finished) {
return true
}
// since the fs route didn't finish routing we need to re-add the
// basePath to continue checking with the basePath present
parsedUrlUpdated.pathname = originalPathname
if (result.pathname) {
parsedUrlUpdated.pathname = result.pathname
}
if (result.query) {
parsedUrlUpdated.query = {
...getNextInternalQuery(parsedUrlUpdated.query),
...result.query,
}
}
// check filesystem
if (testRoute.check === true) {
if (await applyCheckTrue(parsedUrlUpdated)) {
return true
}
}
}
}
return false
} finally {
this.seenRequests.delete(req)
}
}
}