Fixed docker build.

docker/middleware.ts

@@ -0,0 +1,69 @@
+import { NextRequest, NextResponse } from 'next/server';
+
+export const config = {
+  matcher: '/:path*',
+};
+
+const TRACKER_NAME = '/script.js';
+const COLLECT_ENDPOINT = '/api/send';
+
+const apiHeaders = {
+  'Access-Control-Allow-Origin': '*',
+  'Access-Control-Allow-Headers': '*',
+  'Access-Control-Allow-Methods': 'GET, DELETE, POST, PUT',
+  'Access-Control-Max-Age': process.env.CORS_MAX_AGE || '86400',
+  'Cache-Control': 'no-cache',
+};
+
+const trackerHeaders = {
+  'Access-Control-Allow-Origin': '*',
+  'Cache-Control': 'public, max-age=86400, must-revalidate',
+};
+
+function customCollectEndpoint(request: NextRequest) {
+  const collectEndpoint = process.env.COLLECT_API_ENDPOINT;
+
+  if (collectEndpoint) {
+    const url = request.nextUrl.clone();
+
+    if (url.pathname.endsWith(collectEndpoint)) {
+      url.pathname = COLLECT_ENDPOINT;
+      return NextResponse.rewrite(url, { headers: apiHeaders });
+    }
+  }
+}
+
+function customScriptName(request: NextRequest) {
+  const scriptName = process.env.TRACKER_SCRIPT_NAME;
+
+  if (scriptName) {
+    const url = request.nextUrl.clone();
+    const names = scriptName.split(',').map(name => name.trim().replace(/^\/+/, ''));
+
+    if (names.find(name => url.pathname.endsWith(name))) {
+      url.pathname = TRACKER_NAME;
+      return NextResponse.rewrite(url, { headers: trackerHeaders });
+    }
+  }
+}
+
+function customScriptUrl(request: NextRequest) {
+  const scriptUrl = process.env.TRACKER_SCRIPT_URL;
+
+  if (scriptUrl && request.nextUrl.pathname.endsWith(TRACKER_NAME)) {
+    return NextResponse.rewrite(scriptUrl, { headers: trackerHeaders });
+  }
+}
+
+export default function middleware(req: NextRequest) {
+  const fns = [customCollectEndpoint, customScriptName, customScriptUrl];
+
+  for (const fn of fns) {
+    const res = fn(req);
+    if (res) {
+      return res;
+    }
+  }
+
+  return NextResponse.next();
+}