From cd34af2325259afde05b970f81989478d0aae742 Mon Sep 17 00:00:00 2001
From: Alex Iglesias <alexiglesias@finsweet.com>
Date: Wed, 8 Apr 2026 11:56:45 +0200
Subject: [PATCH] fix: rewrite wf.finsweet.com URLs correctly to finsweet.com

---
 src/helpers.test.ts | 11 +++++++++--
 src/helpers.ts      | 14 +++++++++++++-
 src/index.ts        | 26 +++++---------------------
 3 files changed, 27 insertions(+), 24 deletions(-)

diff --git a/src/helpers.test.ts b/src/helpers.test.ts
index f207d9a..c6705b0 100644
--- a/src/helpers.test.ts
+++ b/src/helpers.test.ts
@@ -28,6 +28,10 @@ describe('has_trailing_slash', () => {
 });
 
 describe('subdomain_to_path', () => {
+  test('maps the main webflow subdomain to the root path', () => {
+    expect(subdomain_to_path('wf.finsweet.com')).toEqual([]);
+  });
+
   test('prefers the most specific configured subdomain', () => {
     expect(subdomain_to_path('components.changelog.finsweet.com')).toEqual([
       'components',
@@ -59,7 +63,10 @@ describe('path_to_subdomain', () => {
     });
   });
 
-  test('returns undefined when the first path is not configured', () => {
-    expect(path_to_subdomain(['random'])).toBeUndefined();
+  test('falls back to the main webflow subdomain when path is not configured', () => {
+    expect(path_to_subdomain(['random'])).toEqual({
+      subdomain: 'wf',
+      wildcard_paths: ['random'],
+    });
   });
 });
diff --git a/src/helpers.ts b/src/helpers.ts
index 7620617..50d8c6a 100644
--- a/src/helpers.ts
+++ b/src/helpers.ts
@@ -1,3 +1,5 @@
+import { env } from 'cloudflare:workers';
+
 import { SUBDOMAINS_DATA } from './constants';
 
 /**
@@ -22,6 +24,7 @@ export const has_trailing_slash = (pathname: string) => /\/+$/.test(pathname);
 
 /**
  * Tries to match a hostname to a reverse proxied subdomain.
+ * If the hostname is the webflow subdomain, it returns an empty array to indicate that the request should be proxied to the root of the main Webflow project.
  *
  * @param hostname
  * @returns An array with the paths that correspond to the reverse proxied subdomain.
@@ -30,8 +33,13 @@ export const has_trailing_slash = (pathname: string) => /\/+$/.test(pathname);
  * "attributes.finsweet.com" => ["attributes"]
  * "attributes.combos.finsweet.com" => ["attributes", "combos"]
  * "random.finsweet.com" => undefined
+ * "wf.finsweet.com" => []
  */
 export const subdomain_to_path = (hostname: string) => {
+  if (hostname.startsWith(`${env.WEBFLOW_SUBDOMAIN}.`)) {
+    return [];
+  }
+
   const match = SUBDOMAINS_DATA.find((sub_subdomains) => {
     const subdomain = sub_subdomains.join('.');
 
@@ -43,6 +51,7 @@ export const subdomain_to_path = (hostname: string) => {
 
 /**
  * Tries to match an array of paths to a reverse proxied subdomain.
+ * If no subdomain is matched, it returns the main Webflow subdomain with all paths as wildcard paths.
  * @param paths
  *
  * @returns The matched subdomain and the wildcard paths
@@ -52,7 +61,7 @@ export const subdomain_to_path = (hostname: string) => {
  * ["attributes", "random"] => { subdomain: "attributes", wildcard_paths: ["random"] }
  * ["attributes", "combos"] => { subdomain: "attributes.combos", wildcard_paths: [] }
  * ["attributes", "combos", "random"] => { subdomain: "attributes.combos", wildcard_paths: ["random"] }
- * ["random"] => undefined
+ * ["random"] => { subdomain: env.WEBFLOW_SUBDOMAIN, wildcard_paths: ["random"] }
  */
 export const path_to_subdomain = (paths: string[]) => {
   const match = SUBDOMAINS_DATA.find((sub_subdomains) =>
@@ -65,4 +74,7 @@ export const path_to_subdomain = (paths: string[]) => {
 
     return { subdomain, wildcard_paths };
   }
+
+  // If no subdomains are matched, fetch from the main Webflow project
+  return { subdomain: env.WEBFLOW_SUBDOMAIN, wildcard_paths: paths };
 };
diff --git a/src/index.ts b/src/index.ts
index a14a79b..d7f3a3b 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -7,7 +7,7 @@ import { rewrite_sitemap_locs } from './sitemaps';
 const app = new Hono<{ Bindings: Cloudflare.Env }>();
 
 app.use('*', async (c) => {
-  const { DOMAIN, WEBFLOW_SUBDOMAIN, MAINTENANCE_HREF } = c.env;
+  const { DOMAIN, MAINTENANCE_HREF } = c.env;
   const { origin, hostname, pathname, search, href } = new URL(c.req.url);
 
   const is_under_maintenance = MAINTENANCE_HREF && href.startsWith(MAINTENANCE_HREF);
@@ -27,13 +27,6 @@ app.use('*', async (c) => {
       return c.redirect(redirect_url, 301);
     }
 
-    // Subdomain is the main Webflow project
-    if (hostname.startsWith(`${WEBFLOW_SUBDOMAIN}.`)) {
-      const redirect_url = build_url(MAIN_ORIGIN, paths, search);
-
-      return c.redirect(redirect_url, 301);
-    }
-
     // Subdomain is not reverse proxied
     return fetch(c.req.raw);
   }
@@ -45,20 +38,11 @@ app.use('*', async (c) => {
     return c.redirect(redirect_url, 301);
   }
 
-  // Path matches reverse proxied subdomain
-  const match = path_to_subdomain(paths);
-  if (match) {
-    const { subdomain, wildcard_paths } = match;
-
-    const target_origin = `https://${subdomain}.${DOMAIN}`;
-    const target_url = build_url(target_origin, wildcard_paths, search);
-
-    return fetch_resource(c, target_url);
-  }
+  // Fetch the resource from the corresponding subdomain
+  const { subdomain, wildcard_paths } = path_to_subdomain(paths);
 
-  // If no subdomains are matched, fetch from the main Webflow project
-  const webflow_origin = `https://${WEBFLOW_SUBDOMAIN}.${DOMAIN}`;
-  const target_url = build_url(webflow_origin, paths, search);
+  const target_origin = `https://${subdomain}.${DOMAIN}`;
+  const target_url = build_url(target_origin, wildcard_paths, search);
 
   return fetch_resource(c, target_url);
 });