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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 | import { RateLimiterMemory, RateLimiterRedis } from 'rate-limiter-flexible'; import { redisService } from '../services/redis.service'; interface RateLimitOptions { points: number; // 限流点数 duration: number; // 时间窗口(秒) blockDuration?: number; // 封锁时间(秒) keyGenerator?: (ctx: any) => string; // 自定义键生成器 } // 内存限流器(Redis 不可用时使用) const memoryLimiters = new Map<string, RateLimiterMemory>(); // Redis 限流器 const redisLimiters = new Map<string, RateLimiterRedis>(); /** * 获取或创建限流器 */ function getLimiter(name: string, options: RateLimitOptions) { if (redisService.isAvailable()) { if (!redisLimiters.has(name)) { const limiter = new RateLimiterRedis({ storeClient: redisService['client'], keyPrefix: `rate_limit:${name}:`, points: options.points, duration: options.duration, blockDuration: options.blockDuration || options.duration * 2, }); redisLimiters.set(name, limiter); } return redisLimiters.get(name)!; } else { if (!memoryLimiters.has(name)) { const limiter = new RateLimiterMemory({ points: options.points, duration: options.duration, }); memoryLimiters.set(name, limiter); } return memoryLimiters.get(name)!; } } /** * 创建限流中间件 * @param options 限流配置 */ export function createRateLimiter(options: RateLimitOptions) { const limiter = getLimiter('default', options); return async (ctx: any, next: any) => { try { const key = options.keyGenerator ? options.keyGenerator(ctx) : ctx.ip; await limiter.consume(key, 1); return await next(); } catch (rejRes: any) { const retrySecs = Math.round(rejRes.msBeforeNext / 1000) || 1; ctx.set('Retry-After', String(retrySecs)); ctx.status = 429; ctx.body = { code: 429, message: '请求过于频繁,请稍后再试', retryAfter: retrySecs, }; } }; } /** * API 全局限流(每分钟 100 次) */ export const apiRateLimiter = createRateLimiter({ points: 100, duration: 60, keyGenerator: (ctx) => `api:${ctx.ip}`, }); /** * 登录接口限流(每分钟 5 次) */ export const loginRateLimiter = createRateLimiter({ points: 5, duration: 60, blockDuration: 300, // 封锁 5 分钟 keyGenerator: (ctx) => `login:${ctx.ip}`, }); /** * 验证码发送限流(每分钟 1 次,每小时 5 次) */ export const smsRateLimiter = createRateLimiter({ points: 1, duration: 60, blockDuration: 3600, keyGenerator: (ctx) => `sms:${ctx.request.body?.phone || ctx.ip}`, }); /** * TTS 生成限流(根据用户等级) */ export const ttsRateLimiter = createRateLimiter({ points: 20, duration: 60, keyGenerator: (ctx) => `tts:${ctx.state.user?.id || ctx.ip}`, }); /** * 文件上传限流(每分钟 10 次) */ export const uploadRateLimiter = createRateLimiter({ points: 10, duration: 60, keyGenerator: (ctx) => `upload:${ctx.state.user?.id || ctx.ip}`, }); |