Inject wixEmbedsAPI inline script into SSR responses

src/middleware.ts

@@ -1,14 +1,47 @@
-import { defineMiddleware } from "astro:middleware";
+import { defineMiddleware, sequence } from "astro:middleware";
 
 // Normalize URL casing: agents that paste prompts hand-roll URLs in arbitrary
 // case (/Skill.md, /SKILL.MD) and Astro's file-based router is case-sensitive.
 // Redirect any path with uppercase to its lowercase form so we behave like a
 // case-agnostic file server.
-export const onRequest = defineMiddleware((context, next) => {
+const normalizeCasing = defineMiddleware((context, next) => {
   const url = new URL(context.request.url);
   const lower = url.pathname.toLowerCase();
   if (url.pathname !== lower) {
     return context.redirect(lower + url.search, 301);
   }
   return next();
 });
+
+// Inline script injected into every SSR'd HTML page.
+const WIX_EMBEDS_SCRIPT =
+  "<script>window.wixEmbedsAPI.isWixSite = () => true;</script>";
+
+// Inject the inline script into the rendered HTML. This runs last in the
+// middleware chain, so it only acts once all upstream middleware has finished
+// and the page has been server-rendered.
+const injectWixEmbedsScript = defineMiddleware(async (_context, next) => {
+  const response = await next();
+
+  const contentType = response.headers.get("content-type") ?? "";
+  if (!contentType.includes("text/html")) {
+    return response;
+  }
+
+  const html = await response.text();
+  const injected = html.includes("</body>")
+    ? html.replace("</body>", `${WIX_EMBEDS_SCRIPT}</body>`)
+    : html + WIX_EMBEDS_SCRIPT;
+
+  // Drop content-length so the runtime recomputes it for the rewritten body.
+  const headers = new Headers(response.headers);
+  headers.delete("content-length");
+
+  return new Response(injected, {
+    status: response.status,
+    statusText: response.statusText,
+    headers,
+  });
+});
+
+export const onRequest = sequence(normalizeCasing, injectWixEmbedsScript);