246 lines
7.3 KiB
Python
246 lines
7.3 KiB
Python
"""
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WebUI 请求频率限制模块
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防止暴力破解和 API 滥用
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"""
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import time
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from collections import defaultdict
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from typing import Dict, Tuple, Optional
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from fastapi import Request, HTTPException
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from src.common.logger import get_logger
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logger = get_logger("webui.rate_limiter")
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class RateLimiter:
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"""
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简单的内存请求频率限制器
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使用滑动窗口算法实现
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"""
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def __init__(self):
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# 存储格式: {key: [(timestamp, count), ...]}
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self._requests: Dict[str, list] = defaultdict(list)
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# 被封禁的 IP: {ip: unblock_timestamp}
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self._blocked: Dict[str, float] = {}
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def _get_client_ip(self, request: Request) -> str:
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"""获取客户端 IP 地址"""
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# 检查代理头
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forwarded = request.headers.get("X-Forwarded-For")
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if forwarded:
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# 取第一个 IP（最原始的客户端）
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return forwarded.split(",")[0].strip()
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real_ip = request.headers.get("X-Real-IP")
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if real_ip:
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return real_ip
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# 直接连接的客户端
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if request.client:
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return request.client.host
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return "unknown"
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def _cleanup_old_requests(self, key: str, window_seconds: int):
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"""清理过期的请求记录"""
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now = time.time()
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cutoff = now - window_seconds
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self._requests[key] = [(ts, count) for ts, count in self._requests[key] if ts > cutoff]
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def _cleanup_expired_blocks(self):
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"""清理过期的封禁"""
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now = time.time()
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expired = [ip for ip, unblock_time in self._blocked.items() if now > unblock_time]
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for ip in expired:
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del self._blocked[ip]
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logger.info(f"🔓 IP {ip} 封禁已解除")
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def is_blocked(self, request: Request) -> Tuple[bool, Optional[int]]:
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"""
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检查 IP 是否被封禁
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Returns:
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(是否被封禁, 剩余封禁秒数)
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"""
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self._cleanup_expired_blocks()
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ip = self._get_client_ip(request)
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if ip in self._blocked:
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remaining = int(self._blocked[ip] - time.time())
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return True, max(0, remaining)
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return False, None
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def check_rate_limit(
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self, request: Request, max_requests: int, window_seconds: int, key_suffix: str = ""
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) -> Tuple[bool, int]:
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"""
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检查请求是否超过频率限制
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Args:
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request: FastAPI Request 对象
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max_requests: 窗口期内允许的最大请求数
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window_seconds: 窗口时间（秒）
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key_suffix: 键后缀，用于区分不同的限制规则
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Returns:
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(是否允许, 剩余请求数)
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"""
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ip = self._get_client_ip(request)
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key = f"{ip}:{key_suffix}" if key_suffix else ip
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# 清理过期记录
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self._cleanup_old_requests(key, window_seconds)
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# 计算当前窗口内的请求数
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current_count = sum(count for _, count in self._requests[key])
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if current_count >= max_requests:
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return False, 0
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# 记录新请求
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now = time.time()
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self._requests[key].append((now, 1))
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remaining = max_requests - current_count - 1
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return True, remaining
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def block_ip(self, request: Request, duration_seconds: int):
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"""
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封禁 IP
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Args:
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request: FastAPI Request 对象
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duration_seconds: 封禁时长（秒）
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"""
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ip = self._get_client_ip(request)
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self._blocked[ip] = time.time() + duration_seconds
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logger.warning(f"🔒 IP {ip} 已被封禁 {duration_seconds} 秒")
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def record_failed_attempt(
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self, request: Request, max_failures: int = 5, window_seconds: int = 300, block_duration: int = 600
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) -> Tuple[bool, int]:
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"""
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记录失败尝试（如登录失败）
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如果在窗口期内失败次数过多，自动封禁 IP
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Args:
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request: FastAPI Request 对象
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max_failures: 允许的最大失败次数
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window_seconds: 统计窗口（秒）
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block_duration: 封禁时长（秒）
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Returns:
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(是否被封禁, 剩余尝试次数)
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"""
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ip = self._get_client_ip(request)
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key = f"{ip}:auth_failures"
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# 清理过期记录
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self._cleanup_old_requests(key, window_seconds)
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# 计算当前失败次数
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current_failures = sum(count for _, count in self._requests[key])
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# 记录本次失败
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now = time.time()
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self._requests[key].append((now, 1))
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current_failures += 1
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remaining = max_failures - current_failures
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# 检查是否需要封禁
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if current_failures >= max_failures:
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self.block_ip(request, block_duration)
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logger.warning(f"⚠️ IP {ip} 认证失败次数过多 ({current_failures}/{max_failures})，已封禁")
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return True, 0
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if current_failures >= max_failures - 2:
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logger.warning(f"⚠️ IP {ip} 认证失败 {current_failures}/{max_failures} 次")
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return False, max(0, remaining)
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def reset_failures(self, request: Request):
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"""
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重置失败计数（认证成功后调用）
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"""
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ip = self._get_client_ip(request)
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key = f"{ip}:auth_failures"
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if key in self._requests:
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del self._requests[key]
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# 全局单例
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_rate_limiter: Optional[RateLimiter] = None
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def get_rate_limiter() -> RateLimiter:
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"""获取 RateLimiter 单例"""
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global _rate_limiter
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if _rate_limiter is None:
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_rate_limiter = RateLimiter()
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return _rate_limiter
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async def check_auth_rate_limit(request: Request):
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"""
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认证接口的频率限制依赖
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规则：
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- 每个 IP 每分钟最多 10 次认证请求
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- 连续失败 5 次后封禁 10 分钟
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"""
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limiter = get_rate_limiter()
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# 检查是否被封禁
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blocked, remaining_block = limiter.is_blocked(request)
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if blocked:
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raise HTTPException(
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status_code=429,
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detail=f"请求过于频繁，请在 {remaining_block} 秒后重试",
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headers={"Retry-After": str(remaining_block)},
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)
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# 检查频率限制
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allowed, remaining = limiter.check_rate_limit(
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request,
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max_requests=10, # 每分钟 10 次
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window_seconds=60,
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key_suffix="auth",
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)
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if not allowed:
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raise HTTPException(status_code=429, detail="认证请求过于频繁，请稍后重试", headers={"Retry-After": "60"})
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async def check_api_rate_limit(request: Request):
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"""
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普通 API 的频率限制依赖
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规则：每个 IP 每分钟最多 100 次请求
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"""
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limiter = get_rate_limiter()
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# 检查是否被封禁
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blocked, remaining_block = limiter.is_blocked(request)
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if blocked:
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raise HTTPException(
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status_code=429,
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detail=f"请求过于频繁，请在 {remaining_block} 秒后重试",
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headers={"Retry-After": str(remaining_block)},
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)
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# 检查频率限制
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allowed, _ = limiter.check_rate_limit(
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request,
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max_requests=100, # 每分钟 100 次
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window_seconds=60,
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key_suffix="api",
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)
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if not allowed:
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raise HTTPException(status_code=429, detail="请求过于频繁，请稍后重试", headers={"Retry-After": "60"})
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