feat(backend): block generic user agents

backend/aci/utils.py

@@ -1,6 +1,11 @@
 #!/usr/bin/env python3
 from datetime import datetime
 
+BAD_BOTS = [
+    'undici',
+    'curl/(.*)',
+]
+
 def today() -> str:
     now = datetime.now()
     return format_checkin_date(now)

backend/app.py

@@ -2,9 +2,10 @@
 
 from typing import Union
 import hashlib
+import re
 import sqlite3
 
-from fastapi import Depends, FastAPI
+from fastapi import Depends, FastAPI, Request, Response
 from fastapi.middleware.cors import CORSMiddleware
 
 import uvicorn
@@ -24,6 +25,14 @@ app.add_middleware(
     allow_headers="*",
 )
 
+@app.middleware('http')
+async def badbots_block(req: Request, call_next):
+    ua = req.headers.get('User-Agent', '')
+    for bot in utils.BAD_BOTS:
+        if re.match(bot, ua):
+            return Response('forbidden', status_code=403)
+    return await call_next(req)
+
 @app.get('/')
 def index():
     return {