151 lines
3.9 KiB
TypeScript
151 lines
3.9 KiB
TypeScript
/**
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* 速率限制中间件
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* 使用内存存储（生产环境建议使用Redis）
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*/
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interface RateLimitStore {
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[key: string]: {
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count: number;
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resetTime: number;
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};
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}
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class RateLimiter {
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private store: RateLimitStore = {};
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private windowMs: number;
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private maxRequests: number;
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constructor(windowMs: number = 60000, maxRequests: number = 100) {
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this.windowMs = windowMs;
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this.maxRequests = maxRequests;
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// 定期清理过期记录
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setInterval(() => this.cleanup(), this.windowMs);
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}
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/**
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* 检查是否超过速率限制
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*/
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check(identifier: string): { allowed: boolean; remaining: number; resetTime: number } {
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const now = Date.now();
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const record = this.store[identifier];
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if (!record || now > record.resetTime) {
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// 创建新记录
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this.store[identifier] = {
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count: 1,
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resetTime: now + this.windowMs,
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};
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return {
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allowed: true,
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remaining: this.maxRequests - 1,
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resetTime: now + this.windowMs,
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};
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}
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if (record.count >= this.maxRequests) {
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return {
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allowed: false,
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remaining: 0,
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resetTime: record.resetTime,
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};
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}
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record.count++;
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return {
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allowed: true,
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remaining: this.maxRequests - record.count,
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resetTime: record.resetTime,
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};
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}
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/**
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* 清理过期记录
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*/
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private cleanup(): void {
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const now = Date.now();
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for (const key in this.store) {
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if (this.store[key].resetTime < now) {
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delete this.store[key];
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}
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}
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}
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}
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// 创建不同级别的速率限制器
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export const rateLimiters = {
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// 通用API限制：每分钟100次请求
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api: new RateLimiter(60000, 100),
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// 管理后台接口：设置页会并发加载大量配置，不能和公开 API 共用低阈值
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admin: new RateLimiter(60000, 3000),
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// 文件上传接口：每分钟60次请求（独立于通用API限流）
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upload: new RateLimiter(60000, 60),
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// 原图下载需要服务端转码：按登录用户独立限流，避免共享出口 IP 互相影响
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download: new RateLimiter(60000, 60),
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// 图片代理接口：每分钟3000次请求（图片列表/画布高频加载）
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imageProxy: new RateLimiter(60000, 3000),
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// 高频只读接口（首页/画布轮询）：每分钟1200次请求
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uiPolling: new RateLimiter(60000, 1200),
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// 画布保存接口：每分钟300次请求（含自动保存）
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canvas: new RateLimiter(60000, 300),
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// 实时画布相关接口：每分钟600次请求（配置/指标/代理）
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realtime: new RateLimiter(60000, 600),
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// 聊天接口限制：每分钟60次请求（避免被高频轮询接口挤占额度）
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chat: new RateLimiter(60000, 60),
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// 严格限制：每分钟10次请求（用于敏感操作）
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strict: new RateLimiter(60000, 10),
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// 登录限制：每分钟5次请求
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auth: new RateLimiter(60000, 5),
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// IP限制：每分钟50次请求
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ip: new RateLimiter(60000, 50),
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};
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/**
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* 获取客户端标识符（IP地址）
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*/
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export function getClientIdentifier(request: Request): string {
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// 优先使用x-forwarded-for（考虑代理）
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const forwarded = request.headers.get("x-forwarded-for");
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if (forwarded) {
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return forwarded.split(",")[0].trim();
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}
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// 使用x-real-ip
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const realIP = request.headers.get("x-real-ip");
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if (realIP) {
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return realIP;
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}
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// 降级到unknown
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return "unknown";
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}
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/**
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* 速率限制检查函数
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*/
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export function checkRateLimit(
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request: Request,
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limiter: RateLimiter = rateLimiters.api
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): { allowed: boolean; remaining: number; resetTime: number } {
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const identifier = getClientIdentifier(request);
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return limiter.check(identifier);
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}
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export function checkRateLimitByIdentifier(
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identifier: string,
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limiter: RateLimiter = rateLimiters.api
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): { allowed: boolean; remaining: number; resetTime: number } {
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return limiter.check(identifier);
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}
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