feat: enhance CORS configuration for frontend integration

- Updated CORS middleware to allow specific origins based on NEXT_FRONTEND_URL.
- Added support for localhost origins for local development.
- Ensured compatibility with both www and non-www variants of the frontend URL.

surfsense_backend/app/app.py

@@ -34,9 +34,40 @@ app = FastAPI(lifespan=lifespan)
 app.add_middleware(ProxyHeadersMiddleware, trusted_hosts="*")
 
 # Add CORS middleware
+# When using credentials, we must specify exact origins (not "*")
+# Build allowed origins list from NEXT_FRONTEND_URL
+allowed_origins = []
+if config.NEXT_FRONTEND_URL:
+    allowed_origins.append(config.NEXT_FRONTEND_URL)
+    # Also allow without trailing slash and with www/without www variants
+    frontend_url = config.NEXT_FRONTEND_URL.rstrip("/")
+    if frontend_url not in allowed_origins:
+        allowed_origins.append(frontend_url)
+    # Handle www variants
+    if "://www." in frontend_url:
+        non_www = frontend_url.replace("://www.", "://")
+        if non_www not in allowed_origins:
+            allowed_origins.append(non_www)
+    elif "://" in frontend_url and "://www." not in frontend_url:
+        # Add www variant
+        www_url = frontend_url.replace("://", "://www.")
+        if www_url not in allowed_origins:
+            allowed_origins.append(www_url)
+
+# For local development, also allow common localhost origins
+if not config.BACKEND_URL or (
+    config.NEXT_FRONTEND_URL and "localhost" in config.NEXT_FRONTEND_URL
+):
+    allowed_origins.extend(
+        [
+            "http://localhost:3000",
+            "http://127.0.0.1:3000",
+        ]
+    )
+
 app.add_middleware(
     CORSMiddleware,
-    allow_origins=["*"],  # Allows all origins
+    allow_origins=allowed_origins,
     allow_credentials=True,
     allow_methods=["*"],  # Allows all methods
     allow_headers=["*"],  # Allows all headers