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feat: API rate limiting with slowapi middleware #23

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feat: API rate limiting with slowapi middleware #23

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16 changes: 15 additions & 1 deletion backend/main.py
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Original file line number Diff line number Diff line change
Expand Up @@ -13,8 +13,12 @@

load_dotenv()

from fastapi import FastAPI, Depends, HTTPException, WebSocket, WebSocketDisconnect, Query, UploadFile, File
from fastapi import FastAPI, Depends, HTTPException, Request, WebSocket, WebSocketDisconnect, Query, UploadFile, File
from fastapi.middleware.cors import CORSMiddleware
from slowapi import Limiter, _rate_limit_exceeded_handler
from slowapi.util import get_remote_address
from slowapi.errors import RateLimitExceeded
from slowapi.middleware import SlowAPIMiddleware

from firebase.firebase_admin import initialize_firebase
from firebase_admin import auth as firebase_auth
Expand Down Expand Up @@ -60,6 +64,12 @@
version="1.0.0",
)

# Rate limiter — keyed on client IP. Protects LLM-backed endpoints from abuse.
limiter = Limiter(key_func=get_remote_address)
app.state.limiter = limiter
app.add_exception_handler(RateLimitExceeded, _rate_limit_exceeded_handler)
app.add_middleware(SlowAPIMiddleware)

# CORS — allow frontend origin. In development allow all origins.
frontend_url = os.getenv("FRONTEND_URL", "http://localhost:3000")
app.add_middleware(
Expand Down Expand Up @@ -173,7 +183,9 @@ async def save_behavioral_route(
# ---------------------------------------------------------------------------

@app.post("/analyze/{session_id}", response_model=APIResponse)
@limiter.limit("5/10minutes")
async def analyze_route(
request: Request,
session_id: str,
user_input: UserInput,
uid: str = Depends(verify_token),
Expand Down Expand Up @@ -341,7 +353,9 @@ async def analyze_brochure_route(
# ---------------------------------------------------------------------------

@app.post("/conversation/{session_id}", response_model=APIResponse)
@limiter.limit("10/minute")
async def conversation_route(
request: Request,
session_id: str,
message: ConversationMessage,
uid: str = Depends(verify_token),
Expand Down
5 changes: 4 additions & 1 deletion requirements.txt
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Expand Up @@ -32,4 +32,7 @@ python-multipart==0.0.12

# Utilities
asyncio==3.4.3
tenacity==9.0.0
tenacity==9.0.0

# Rate Limiting
slowapi==0.1.9