06fe57c765
Major changes: - Add Go backend (backend/) with microservices architecture - Enhanced master-agents-svc: reranker, content-classifier, stealth-crawler, proxy-manager, media-search, fastClassifier, language detection - New web-svc widgets: KnowledgeCard, ProductCard, ProfileCard, VideoCard, UnifiedCard, CardGallery, InlineImageGallery, SourcesPanel, RelatedQuestions - Improved discover-svc with discover-db integration - Docker deployment improvements (Caddyfile, vendor.sh, BUILD.md) - Library-svc: project_id schema migration - Remove deprecated finance-svc and travel-svc - Localization improvements across services Made-with: Cursor
107 lines
1.8 KiB
Go
107 lines
1.8 KiB
Go
package middleware
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import (
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"sync"
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"time"
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"github.com/gofiber/fiber/v2"
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)
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type RateLimitConfig struct {
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Max int
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WindowSecs int
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KeyFunc func(*fiber.Ctx) string
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}
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type rateLimiter struct {
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requests map[string][]time.Time
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mu sync.RWMutex
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max int
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window time.Duration
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}
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func newRateLimiter(max int, windowSecs int) *rateLimiter {
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rl := &rateLimiter{
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requests: make(map[string][]time.Time),
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max: max,
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window: time.Duration(windowSecs) * time.Second,
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}
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go rl.cleanup()
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return rl
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}
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func (rl *rateLimiter) cleanup() {
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ticker := time.NewTicker(time.Minute)
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for range ticker.C {
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rl.mu.Lock()
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now := time.Now()
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for key, times := range rl.requests {
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var valid []time.Time
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for _, t := range times {
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if now.Sub(t) < rl.window {
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valid = append(valid, t)
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}
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}
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if len(valid) == 0 {
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delete(rl.requests, key)
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} else {
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rl.requests[key] = valid
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}
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}
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rl.mu.Unlock()
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}
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}
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func (rl *rateLimiter) allow(key string) bool {
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rl.mu.Lock()
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defer rl.mu.Unlock()
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now := time.Now()
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windowStart := now.Add(-rl.window)
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times := rl.requests[key]
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var valid []time.Time
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for _, t := range times {
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if t.After(windowStart) {
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valid = append(valid, t)
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}
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}
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if len(valid) >= rl.max {
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rl.requests[key] = valid
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return false
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}
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rl.requests[key] = append(valid, now)
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return true
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}
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func RateLimit(config RateLimitConfig) fiber.Handler {
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if config.Max == 0 {
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config.Max = 100
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}
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if config.WindowSecs == 0 {
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config.WindowSecs = 60
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}
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if config.KeyFunc == nil {
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config.KeyFunc = func(c *fiber.Ctx) string {
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return c.IP()
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}
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}
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limiter := newRateLimiter(config.Max, config.WindowSecs)
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return func(c *fiber.Ctx) error {
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key := config.KeyFunc(c)
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if !limiter.allow(key) {
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return c.Status(429).JSON(fiber.Map{
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"error": "Too many requests",
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})
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}
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return c.Next()
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}
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}
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