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fix(edge-runtime): match path with URI-encoded chars
Following the behaviour in vercel/next.js#78325, if a path matches a configured middleware matcher when URI-decoded, consider it a match. This doesn't seem ideal, but it aligns our behaviour with that of Next.js, and ensures that static asset matching behaviour aligns with edge middleware matching behaviour.
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+74
-5
lines changed

10 files changed

+74
-5
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‎edge-runtime/lib/routing.ts

+12-2
Original file line numberDiff line numberDiff line change
@@ -424,14 +424,24 @@ export interface MiddlewareMatcher {
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missing?: RouteHas[]
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}
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const decodeMaybeEncodedPath = (path: string): string => {
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try {
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return decodeURIComponent(path)
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} catch {
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return path
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}
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}
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export function getMiddlewareRouteMatcher(matchers: MiddlewareMatcher[]): MiddlewareRouteMatch {
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return (
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pathname: string | null | undefined,
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unsafePathname: string | null | undefined,
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req: Pick<Request, 'headers' | 'url'>,
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query: Params,
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) => {
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const pathname = decodeMaybeEncodedPath(unsafePathname ?? '')
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for (const matcher of matchers) {
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const routeMatch = new RegExp(matcher.regexp).exec(pathname!)
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const routeMatch = new RegExp(matcher.regexp).exec(pathname)
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if (!routeMatch) {
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continue
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}

‎tests/e2e/edge-middleware.test.ts

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@@ -233,6 +233,15 @@ test("requests with x-middleware-subrequest don't skip middleware (GHSA-f82v-jwr
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expect(response.headers.get('x-test-used-next-version')).toBe('15.2.2')
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})
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236+
test('requests with different encoding than matcher match anyway', async ({
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middlewareStaticAssetMatcher,
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}) => {
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const response = await fetch(`${middlewareStaticAssetMatcher.url}/hello%2Fworld.txt`)
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// middleware was not skipped
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expect(await response.text()).toBe('hello from middleware')
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})
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test.describe('RSC cache poisoning', () => {
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test('Middleware rewrite', async ({ page, middleware }) => {
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const prefetchResponsePromise = new Promise<Response>((resolve) => {

‎tests/fixtures/middleware-og/package.json

-2
Original file line numberDiff line numberDiff line change
@@ -8,8 +8,6 @@
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"build": "next build"
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},
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"dependencies": {
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"@aws-amplify/adapter-nextjs": "^1.0.18",
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"aws-amplify": "^6.0.18",
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"next": "latest",
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"react": "18.2.0",
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"react-dom": "18.2.0"

‎tests/fixtures/middleware-static-asset-matcher/app/layout.js

+12
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@@ -0,0 +1,12 @@
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export const metadata = {
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title: 'Simple Next App',
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description: 'Description for Simple Next App',
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}
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export default function RootLayout({ children }) {
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return (
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<html lang="en">
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<body>{children}</body>
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</html>
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)
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}

‎tests/fixtures/middleware-static-asset-matcher/app/page.js

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@@ -0,0 +1,7 @@
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export default function Home() {
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return (
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<main>
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<h1>Home</h1>
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</main>
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)
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}

‎tests/fixtures/middleware-static-asset-matcher/middleware.ts

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,7 @@
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export default function middleware() {
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return new Response('hello from middleware')
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}
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export const config = {
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matcher: '/hello/world.txt',
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}

‎tests/fixtures/middleware-static-asset-matcher/next.config.js

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@@ -0,0 +1,9 @@
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/** @type {import('next').NextConfig} */
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const nextConfig = {
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output: 'standalone',
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eslint: {
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ignoreDuringBuilds: true,
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},
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}
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module.exports = nextConfig

‎tests/fixtures/middleware-static-asset-matcher/package.json

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@@ -0,0 +1,15 @@
1+
{
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"name": "middleware",
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"version": "0.1.0",
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"private": true,
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"scripts": {
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"postinstall": "next build",
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"dev": "next dev",
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"build": "next build"
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},
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"dependencies": {
11+
"next": "latest",
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"react": "18.2.0",
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"react-dom": "18.2.0"
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}
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}

‎tests/fixtures/middleware-static-asset-matcher/public/hello/world.txt

+1
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@@ -0,0 +1 @@
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hello from a static asset

‎tests/utils/create-e2e-fixture.ts

+2-1
Original file line numberDiff line numberDiff line change
@@ -333,10 +333,11 @@ export const fixtureFactories = {
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pnpm: () => createE2EFixture('pnpm', { packageManger: 'pnpm' }),
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bun: () => createE2EFixture('simple', { packageManger: 'bun' }),
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middleware: () => createE2EFixture('middleware'),
336-
middlewareSubrequestVuln: () => createE2EFixture('middleware-subrequest-vuln'),
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middlewareI18nExcludedPaths: () => createE2EFixture('middleware-i18n-excluded-paths'),
338337
middlewareOg: () => createE2EFixture('middleware-og'),
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middlewarePages: () => createE2EFixture('middleware-pages'),
339+
middlewareStaticAssetMatcher: () => createE2EFixture('middleware-static-asset-matcher'),
340+
middlewareSubrequestVuln: () => createE2EFixture('middleware-subrequest-vuln'),
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pageRouter: () => createE2EFixture('page-router'),
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pageRouterBasePathI18n: () => createE2EFixture('page-router-base-path-i18n'),
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turborepo: () =>

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