create project

api/middlewares/ratelimit.go

@@ -0,0 +1,52 @@
+package middlewares
+
+import (
+	"sync"
+	"time"
+
+	"github.com/drama-generator/backend/pkg/response"
+	"github.com/gin-gonic/gin"
+)
+
+type rateLimiter struct {
+	mu       sync.Mutex
+	requests map[string][]time.Time
+	limit    int
+	window   time.Duration
+}
+
+var limiter = &rateLimiter{
+	requests: make(map[string][]time.Time),
+	limit:    100,
+	window:   time.Minute,
+}
+
+func RateLimitMiddleware() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		ip := c.ClientIP()
+
+		limiter.mu.Lock()
+		defer limiter.mu.Unlock()
+
+		now := time.Now()
+		requests := limiter.requests[ip]
+
+		var validRequests []time.Time
+		for _, t := range requests {
+			if now.Sub(t) < limiter.window {
+				validRequests = append(validRequests, t)
+			}
+		}
+
+		if len(validRequests) >= limiter.limit {
+			response.Error(c, 429, "RATE_LIMIT_EXCEEDED", "请求过于频繁，请稍后再试")
+			c.Abort()
+			return
+		}
+
+		validRequests = append(validRequests, now)
+		limiter.requests[ip] = validRequests
+
+		c.Next()
+	}
+}