fix: dateFormat normalization middleware

middleware.ts

@@ -43,6 +43,7 @@ export const middleware: NextMiddleware = async (request, event) => {
     )
   }
 
+  // Note that the order of middlewares is important since that is the order they are matched by.
   const middlewares = [
     currentWebLogin,
     currentWebLoginEmail,
@@ -51,9 +52,9 @@ export const middleware: NextMiddleware = async (request, event) => {
     handleAuth,
     myPages,
     webView,
+    dateFormat,
     bookingFlow,
     cmsContent,
-    dateFormat,
   ]
 
   try {

middlewares/dateFormat.ts

@@ -7,6 +7,7 @@ import { MiddlewareMatcher } from "@/types/middleware"
     YYYY-MM-D and YYYY-MM-DD since the current web uses YYYY-MM-D 
     in the URL as parameters (toDate and fromDate)
 */
+const legacyDatePattern = /^([12]\d{3}-(0[1-9]|1[0-2])-([1-9]))$/
 
 function normalizeDate(date: string): string {
   const datePattern = /^\d{4}-\d{1,2}-\d{1,2}$/
@@ -18,20 +19,32 @@ function normalizeDate(date: string): string {
 }
 
 export const middleware: NextMiddleware = (request) => {
-  const url = request.nextUrl.clone()
+  const url = request.nextUrl
   const { searchParams } = url
 
-  if (searchParams.has("fromDate")) {
+  if (
+    !!(
+      searchParams.has("fromDate") &&
+      searchParams.get("fromDate")!.match(legacyDatePattern)
+    ) ||
+    !!(
+      searchParams.has("toDate") &&
+      searchParams.get("toDate")!.match(legacyDatePattern)
+    )
+  ) {
     const fromDate = searchParams.get("fromDate")!
-    searchParams.set("fromDate", normalizeDate(fromDate))
+    url.searchParams.set("fromDate", normalizeDate(fromDate))
-  }
 
-  if (searchParams.has("toDate")) {
     const toDate = searchParams.get("toDate")!
-    searchParams.set("toDate", normalizeDate(toDate))
+    url.searchParams.set("toDate", normalizeDate(toDate))
+    return NextResponse.redirect(url)
+  } else {
+    const headers = new Headers(request.headers)
+    headers.set("x-continue", "1")
+    return NextResponse.next({
+      headers,
+    })
   }
-
-  return NextResponse.rewrite(url)
 }
 
 export const matcher: MiddlewareMatcher = (request) => {

next.config.js

@@ -136,7 +136,7 @@ const nextConfig = {
           {
             key: "fromDate",
             type: "query",
-            value: "^([12]\\d{3}-(0[1-9]|1[0-2])-(0[1-9]|[12]\\d|3[01]))$",
+            value: "^([12]\\d{3}-(0[1-9]|1[0-2])-(0?[1-9]|[12]\\d|3[01]))$",
           },
         ],
         permanent: false,
@@ -168,7 +168,7 @@ const nextConfig = {
           {
             key: "toDate",
             type: "query",
-            value: "^([12]\\d{3}-(0[1-9]|1[0-2])-(0[1-9]|[12]\\d|3[01]))$",
+            value: "^([12]\\d{3}-(0[1-9]|1[0-2])-(0?[1-9]|[12]\\d|3[01]))$",
           },
         ],
         permanent: false,