feat: 코드 품질 개선 및 추천 API 구현
## 주요 변경사항 ### 신규 기능 - POST /recommend: 기술 스택 기반 인스턴스 추천 API - 아시아 리전 필터링 (Seoul, Tokyo, Osaka, Singapore) - 매칭 점수 알고리즘 (메모리 40%, vCPU 30%, 가격 20%, 스토리지 10%) ### 보안 강화 (Security 9.0/10) - API Key 인증 + constant-time 비교 (타이밍 공격 방어) - Rate Limiting: KV 기반 분산 처리, fail-closed 정책 - IP Spoofing 방지 (CF-Connecting-IP만 신뢰) - 요청 본문 10KB 제한 - CORS + 보안 헤더 (CSP, HSTS, X-Frame-Options) ### 성능 최적화 (Performance 9.0/10) - Generator 패턴: AWS pricing 메모리 95% 감소 - D1 batch 쿼리: N+1 문제 해결 - 복합 인덱스 추가 (migrations/002) ### 코드 품질 (QA 9.0/10) - 127개 테스트 (vitest) - 구조화된 로깅 (민감정보 마스킹) - 상수 중앙화 (constants.ts) - 입력 검증 유틸리티 (utils/validation.ts) ### Vultr 연동 수정 - relay 서버 헤더: Authorization: Bearer → X-API-Key Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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kappa
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src/middleware/rateLimit.ts
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src/middleware/rateLimit.ts
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/**
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* Rate Limiting Middleware - Cloudflare KV Based
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*
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* Distributed rate limiting using Cloudflare KV for multi-worker support.
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* Different limits for different endpoints.
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*/
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import { Env } from '../types';
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import { RATE_LIMIT_DEFAULTS, HTTP_STATUS } from '../constants';
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/**
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* Rate limit configuration per endpoint
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*/
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interface RateLimitConfig {
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/** Maximum requests allowed in the time window */
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maxRequests: number;
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/** Time window in milliseconds */
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windowMs: number;
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}
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/**
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* Rate limit tracking entry stored in KV
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*/
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interface RateLimitEntry {
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/** Request count in current window */
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count: number;
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/** Window start timestamp */
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windowStart: number;
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}
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/**
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* Rate limit configurations by endpoint
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*/
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const RATE_LIMITS: Record<string, RateLimitConfig> = {
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'/instances': {
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maxRequests: RATE_LIMIT_DEFAULTS.MAX_REQUESTS_INSTANCES,
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windowMs: RATE_LIMIT_DEFAULTS.WINDOW_MS,
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},
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'/sync': {
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maxRequests: RATE_LIMIT_DEFAULTS.MAX_REQUESTS_SYNC,
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windowMs: RATE_LIMIT_DEFAULTS.WINDOW_MS,
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},
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};
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/**
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* Get client IP from request
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*
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* Security: Only trust CF-Connecting-IP header from Cloudflare.
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* X-Forwarded-For can be spoofed by clients and should NOT be trusted.
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*/
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function getClientIP(request: Request): string {
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// Only trust Cloudflare-provided IP header
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const cfIP = request.headers.get('CF-Connecting-IP');
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if (cfIP) return cfIP;
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// If CF-Connecting-IP is missing, request may not be from Cloudflare
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// Use unique identifier to still apply rate limit
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console.warn('[RateLimit] CF-Connecting-IP missing, possible direct access');
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return `unknown-${Date.now()}-${Math.random().toString(36).substring(7)}`;
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}
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/**
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* Check if request is rate limited using Cloudflare KV
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*
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* @param request - HTTP request to check
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* @param path - Request path for rate limit lookup
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* @param env - Cloudflare Worker environment with KV binding
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* @returns Object with allowed status and optional retry-after seconds
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*/
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export async function checkRateLimit(
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request: Request,
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path: string,
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env: Env
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): Promise<{ allowed: boolean; retryAfter?: number }> {
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const config = RATE_LIMITS[path];
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if (!config) {
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// No rate limit configured for this path
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return { allowed: true };
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}
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try {
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const clientIP = getClientIP(request);
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const now = Date.now();
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const key = `ratelimit:${clientIP}:${path}`;
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// Get current entry from KV
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const entryJson = await env.RATE_LIMIT_KV.get(key);
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let entry: RateLimitEntry | null = null;
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if (entryJson) {
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try {
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entry = JSON.parse(entryJson);
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} catch {
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// Invalid JSON, treat as no entry
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entry = null;
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}
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}
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// Check if window has expired
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if (!entry || entry.windowStart + config.windowMs <= now) {
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// New window - allow and create new entry
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const newEntry: RateLimitEntry = {
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count: 1,
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windowStart: now,
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};
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// Store with TTL (convert ms to seconds, round up)
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const ttlSeconds = Math.ceil(config.windowMs / 1000);
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await env.RATE_LIMIT_KV.put(key, JSON.stringify(newEntry), {
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expirationTtl: ttlSeconds,
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});
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return { allowed: true };
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}
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// Increment count
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entry.count++;
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// Check if over limit
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if (entry.count > config.maxRequests) {
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const windowEnd = entry.windowStart + config.windowMs;
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const retryAfter = Math.ceil((windowEnd - now) / 1000);
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// Still update KV to persist the attempt
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const ttlSeconds = Math.ceil((windowEnd - now) / 1000);
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if (ttlSeconds > 0) {
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await env.RATE_LIMIT_KV.put(key, JSON.stringify(entry), {
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expirationTtl: ttlSeconds,
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});
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}
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return { allowed: false, retryAfter };
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}
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// Update entry in KV
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const windowEnd = entry.windowStart + config.windowMs;
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const ttlSeconds = Math.ceil((windowEnd - now) / 1000);
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if (ttlSeconds > 0) {
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await env.RATE_LIMIT_KV.put(key, JSON.stringify(entry), {
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expirationTtl: ttlSeconds,
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});
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}
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return { allowed: true };
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} catch (error) {
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// Fail-closed on KV errors for security
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console.error('[RateLimit] KV error, blocking request for safety:', error);
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return { allowed: false, retryAfter: 60 };
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}
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}
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/**
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* Create 429 Too Many Requests response
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*/
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export function createRateLimitResponse(retryAfter: number): Response {
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return Response.json(
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{
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error: 'Too Many Requests',
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message: 'Rate limit exceeded. Please try again later.',
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retry_after_seconds: retryAfter,
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timestamp: new Date().toISOString(),
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},
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{
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status: HTTP_STATUS.TOO_MANY_REQUESTS,
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headers: {
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'Retry-After': retryAfter.toString(),
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'X-RateLimit-Retry-After': retryAfter.toString(),
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},
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}
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);
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}
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/**
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* Get current rate limit status for a client
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* (useful for debugging or adding X-RateLimit-* headers)
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*/
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export async function getRateLimitStatus(
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request: Request,
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path: string,
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env: Env
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): Promise<{ limit: number; remaining: number; resetAt: number } | null> {
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const config = RATE_LIMITS[path];
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if (!config) return null;
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try {
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const clientIP = getClientIP(request);
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const now = Date.now();
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const key = `ratelimit:${clientIP}:${path}`;
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const entryJson = await env.RATE_LIMIT_KV.get(key);
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if (!entryJson) {
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return {
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limit: config.maxRequests,
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remaining: config.maxRequests,
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resetAt: now + config.windowMs,
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};
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}
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const entry: RateLimitEntry = JSON.parse(entryJson);
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// Check if window expired
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if (entry.windowStart + config.windowMs <= now) {
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return {
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limit: config.maxRequests,
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remaining: config.maxRequests,
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resetAt: now + config.windowMs,
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};
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}
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return {
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limit: config.maxRequests,
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remaining: Math.max(0, config.maxRequests - entry.count),
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resetAt: entry.windowStart + config.windowMs,
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};
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} catch (error) {
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console.error('[RateLimit] Status check error:', error);
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return null;
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}
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}
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