请求变量增加${cname}，WAF checkpoint增加cname和isCNAME

pkg/serverconfigs/firewallconfigs/http_firewall_checkpoints.go

@@ -152,6 +152,21 @@ var AllCheckpoints = []*HTTPFirewallCheckpointDefinition{
 		IsRequest:   true,
 		Priority:    100,
 	},
+	{
+		Name:        "CNAME",
+		Prefix:      "cname",
+		Description: "当前网站服务CNAME，比如38b48e4f.goedge.cn",
+		IsRequest:   true,
+		Priority:    100,
+	},
+	{
+		Name:        "是否为CNAME",
+		Prefix:      "isCNAME",
+		Description: "是否为CNAME，值为1（是）或0（否）",
+		IsRequest:   true,
+		Priority:    100,
+		DataType:    "bool",
+	},
 	{
 		Name:        "请求来源URL",
 		Prefix:      "referer",