Added middleware for docker.

docker/middleware.js

@@ -0,0 +1,46 @@
+import { NextResponse } from 'next/server';
+
+export const config = {
+  matcher: '/:path*',
+};
+
+function customCollectEndpoint(req) {
+  const collectEndpoint = process.env.COLLECT_API_ENDPOINT;
+
+  if (collectEndpoint) {
+    const url = req.nextUrl.clone();
+    const { pathname } = url;
+
+    if (pathname.endsWith(collectEndpoint)) {
+      url.pathname = '/api/send';
+      return NextResponse.rewrite(url);
+    }
+  }
+}
+
+function customScriptName(req) {
+  const scriptName = process.env.TRACKER_SCRIPT_NAME;
+
+  if (scriptName) {
+    const url = req.nextUrl.clone();
+    const { pathname } = url;
+
+    if (pathname.endsWith(scriptName)) {
+      url.pathname = '/script.js';
+      return NextResponse.rewrite(url);
+    }
+  }
+}
+
+export default function middleware(req) {
+  const fns = [customCollectEndpoint, customScriptName];
+
+  for (const fn of fns) {
+    const res = fn(req);
+    if (res) {
+      return res;
+    }
+  }
+
+  return NextResponse.next();
+}