EES-5464 replace next config rewrite with middleware solution

src/explore-education-statistics-frontend/next.config.js

@@ -36,14 +36,6 @@ const nextConfig = {
       },
     ];
   },
-  async rewrites() {
-    return [
-      {
-        source: '/data-catalogue/data-set/:dataSetFileId/csv',
-        destination: `${process.env.CONTENT_API_BASE_URL}/data-set-files/:dataSetFileId/download`,
-      },
-    ];
-  },
   webpack(config, options) {
     const { dev, isServer } = options;
 

src/explore-education-statistics-frontend/package.json

@@ -25,6 +25,7 @@
     "memoizee": "^0.4.14",
     "next": "^14.2.2",
     "next-sitemap": "^4.2.3",
+    "node-match-path": "^0.6.3",
     "nookies": "^2.5.2",
     "react": "18.2.0",
     "react-dom": "18.2.0",

src/explore-education-statistics-frontend/src/middleware.ts

@@ -1,9 +1,8 @@
 import redirectPages from '@frontend/middleware/pages/redirectPages';
-import type { NextRequest } from 'next/server';
+import chain from './middleware/chain';
+import rewriteDataCatalogueDownload from './middleware/pages/rewriteDataCatalogue';
 
-export default async function middleware(request: NextRequest) {
-  return redirectPages(request);
-}
+export default chain([rewriteDataCatalogueDownload, redirectPages]);
 
 // Only run the middleware on the specified paths below.
 // Ideally we'd just exclude build files and run it on all routes,
@@ -16,6 +15,7 @@ export const config = {
     '/find-statistics/:path*/:path*',
     '/data-tables',
     '/data-catalogue',
+    '/data-catalogue/data-set/:dataSetFileId/csv',
     '/methodology/:path*',
     '/subscriptions',
   ],

src/explore-education-statistics-frontend/src/middleware/chain.ts

@@ -0,0 +1,16 @@
+import { NextMiddleware, NextResponse } from 'next/server';
+
+export type MiddlewareFactory = (middleware: NextMiddleware) => NextMiddleware;
+
+export default function chain(
+  functions: MiddlewareFactory[],
+  index = 0,
+): NextMiddleware {
+  const current = functions[index];
+  if (current) {
+    const next = chain(functions, index + 1);
+    return current(next);
+  }
+
+  return () => NextResponse.next();
+}