修复CDN环境下获取真实客户端IP的问题

handlers/helpers.go

@@ -1,6 +1,8 @@
 package handlers
 
 import (
+	"strings"
+
 	"github.com/gin-gonic/gin"
 )
 
@@ -64,3 +66,18 @@ func getTr(c *gin.Context) map[string]string {
 	}
 	return m
 }
+
+// GetClientIP extracts the real client IP address, accounting for CDN/reverse proxy setups.
+// It checks X-Forwarded-For and X-Real-IP headers before falling back to c.ClientIP().
+func GetClientIP(c *gin.Context) string {
+	if xff := c.GetHeader("X-Forwarded-For"); xff != "" {
+		if i := strings.IndexByte(xff, ','); i != -1 {
+			return strings.TrimSpace(xff[:i])
+		}
+		return strings.TrimSpace(xff)
+	}
+	if xri := c.GetHeader("X-Real-IP"); xri != "" {
+		return strings.TrimSpace(xri)
+	}
+	return c.ClientIP()
+}