fix(GRO-2586): enforce trusted-origins allowlist on Better Auth CORS responses (#219)

fix(GRO-2586): enforce trusted-origins allowlist on Better Auth CORS responses

Co-Authored-By: Paperclip <noreply@paperclip.ing>

src/index.ts

@@ -3,6 +3,7 @@ import { Hono } from "hono";
 import { logger } from "hono/logger";
 import { cors } from "hono/cors";
 import { getAuth, initAuth, getActiveProviders } from "./lib/auth.js";
+import { enforceAuthCors } from "./lib/auth-cors.js";
 import { clientsRouter } from "./routes/clients.js";
 import { petsRouter } from "./routes/pets.js";
 import { servicesRouter } from "./routes/services.js";
@@ -200,9 +201,10 @@ api.use("*", resolveStaffMiddleware);
 // Better-Auth handler — mounted as sub-app to handle all /api/auth/* routes
 // authMiddleware and resolveStaffMiddleware both skip /api/auth/ paths
 const authRouter = new Hono();
-authRouter.all("/*", (c) => {
+authRouter.all("/*", async (c) => {
   try {
-    return getAuth().handler(c.req.raw);
+    const res = await getAuth().handler(c.req.raw);
+    return enforceAuthCors(c.req.header("origin"), TRUSTED_ORIGINS, res);
   } catch {
     return c.json({ error: "Authentication not configured" }, 503);
   }