richcms获取IP地址的方法

richcms是一个使用golang+mysql开发的通用cms系统，今天分享richcms系统中获取IP地址的方法。richcms的在线文档地址：https://www.richcms.net/docs

func getIP(c *gow.Context) (ip string) {
	ip = c.GetHeader("X-Original-Forwarded-For")
	if ip == "" {
		ip = c.GetHeader("Remote-Host")
	}
	if ip == "" {
		ip = c.GetHeader("X-Real-IP")
	}
	if ip == "" {
		ip = c.GetHeader("X-Forwarded-For")
	}
	if ip == "" {
		addr := c.Request.RemoteAddr
		ip, _, _ = net.SplitHostPort(addr)
	}
	if ip == "" {
		ip = "10.10.10.2"
	}
	ips := strings.Split(ip, ",")
	if len(ips) > 0 {
		ip = ips[0]
	}
	ip = strings.TrimSpace(ip)
	netIP := net.ParseIP(ip)
	if netIP != nil {
		return ip
	}
	return ip
}