refactor🎨: 优化获取客户端 IP 的逻辑，增加对 X-Forwarded-For 和 X-Real-IP 的处理

Author: wenjianzhang

common/ip.go

@@ -6,22 +6,23 @@ import (
 )
 
 func GetClientIP(c *gin.Context) string {
-	ClientIP := c.ClientIP()
-	//fmt.Println("ClientIP:", ClientIP)
-	RemoteIP := c.RemoteIP()
-	//fmt.Println("RemoteIP:", RemoteIP)
+	// 优先从 X-Forwarded-For 获取 IP
 	ip := c.Request.Header.Get("X-Forwarded-For")
-	if strings.Contains(ip, "127.0.0.1") || ip == "" {
+	if ip == "" || strings.Contains(ip, "127.0.0.1") {
+		// 如果为空或为本地地址，则尝试从 X-Real-IP 获取
 		ip = c.Request.Header.Get("X-real-ip")
 	}
 	if ip == "" {
-		ip = "127.0.0.1"
+		// 如果仍为空，则使用 RemoteIP
+		ip = c.RemoteIP()
 	}
-	if RemoteIP != "127.0.0.1" {
-		ip = RemoteIP
+	if ip == "" || ip == "127.0.0.1" {
+		// 如果仍为空或为本地地址，则使用 ClientIP
+		ip = c.ClientIP()
 	}
-	if ClientIP != "127.0.0.1" {
-		ip = ClientIP
+	if ip == "" {
+		// 最后兜底为本地地址
+		ip = "127.0.0.1"
 	}
 	return ip
 }