72 lines
2.1 KiB
Python
72 lines
2.1 KiB
Python
from __future__ import annotations
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import secrets
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import time
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from typing import Optional
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from fastapi import Depends, Header, HTTPException, Request
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from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer
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from backend import config
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_bearer = HTTPBearer(auto_error=False)
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_RATE_LIMIT = 5
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_RATE_WINDOW = 600 # 10 minutes
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_SIGNAL_RATE_LIMIT = 10
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_SIGNAL_RATE_WINDOW = 60 # 1 minute
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def _get_client_ip(request: Request) -> str:
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return (
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request.headers.get("X-Real-IP")
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or request.headers.get("X-Forwarded-For", "").split(",")[0].strip()
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or (request.client.host if request.client else "unknown")
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)
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async def verify_webhook_secret(
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x_telegram_bot_api_secret_token: str = Header(default=""),
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) -> None:
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if not secrets.compare_digest(
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x_telegram_bot_api_secret_token, config.WEBHOOK_SECRET
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):
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raise HTTPException(status_code=403, detail="Forbidden")
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async def verify_admin_token(
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credentials: Optional[HTTPAuthorizationCredentials] = Depends(_bearer),
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) -> None:
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if credentials is None or not secrets.compare_digest(
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credentials.credentials, config.ADMIN_TOKEN
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):
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raise HTTPException(status_code=401, detail="Unauthorized")
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async def rate_limit_register(request: Request) -> None:
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counters = request.app.state.rate_counters
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client_ip = _get_client_ip(request)
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now = time.time()
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count, window_start = counters.get(client_ip, (0, now))
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if now - window_start >= _RATE_WINDOW:
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count = 0
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window_start = now
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count += 1
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counters[client_ip] = (count, window_start)
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if count > _RATE_LIMIT:
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raise HTTPException(status_code=429, detail="Too Many Requests")
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async def rate_limit_signal(request: Request) -> None:
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counters = request.app.state.rate_counters
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key = f"sig:{_get_client_ip(request)}"
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now = time.time()
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count, window_start = counters.get(key, (0, now))
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if now - window_start >= _SIGNAL_RATE_WINDOW:
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count = 0
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window_start = now
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count += 1
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counters[key] = (count, window_start)
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if count > _SIGNAL_RATE_LIMIT:
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raise HTTPException(status_code=429, detail="Too Many Requests")
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