feat(middleware): add email verification rate limit

middleware/email-verification-rate-limit.go

@@ -0,0 +1,70 @@
+package middleware
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"one-api/common"
+	"time"
+
+	"github.com/gin-gonic/gin"
+)
+
+const (
+	EmailVerificationRateLimitMark = "EV"
+	EmailVerificationMaxRequests   = 2  // 30秒内最多2次
+	EmailVerificationDuration      = 30 // 30秒时间窗口
+)
+
+func redisEmailVerificationRateLimiter(c *gin.Context) {
+	ctx := context.Background()
+	rdb := common.RDB
+	key := "emailVerification:" + EmailVerificationRateLimitMark + ":" + c.ClientIP()
+
+	listLength, err := rdb.LLen(ctx, key).Result()
+	if err != nil {
+		fmt.Println("Redis限流检查失败:", err.Error())
+		c.Status(http.StatusInternalServerError)
+		c.Abort()
+		return
+	}
+
+	if listLength < EmailVerificationMaxRequests {
+		rdb.LPush(ctx, key, time.Now().Format(timeFormat))
+		rdb.Expire(ctx, key, time.Duration(EmailVerificationDuration)*time.Second)
+		c.Next()
+		return
+	}
+
+	c.JSON(http.StatusTooManyRequests, gin.H{
+		"success": false,
+		"message": fmt.Sprintf("发送过于频繁，请等待 %d 秒后再试", EmailVerificationDuration),
+	})
+	c.Abort()
+}
+
+func memoryEmailVerificationRateLimiter(c *gin.Context) {
+	key := EmailVerificationRateLimitMark + ":" + c.ClientIP()
+
+	if !inMemoryRateLimiter.Request(key, EmailVerificationMaxRequests, EmailVerificationDuration) {
+		c.JSON(http.StatusTooManyRequests, gin.H{
+			"success": false,
+			"message": "发送过于频繁，请稍后再试",
+		})
+		c.Abort()
+		return
+	}
+
+	c.Next()
+}
+
+func EmailVerificationRateLimit() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		if common.RedisEnabled {
+			redisEmailVerificationRateLimiter(c)
+		} else {
+			inMemoryRateLimiter.Init(common.RateLimitKeyExpirationDuration)
+			memoryEmailVerificationRateLimiter(c)
+		}
+	}
+}