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

internal/waf/checkpoints/request_cname.go

@@ -0,0 +1,22 @@
+package checkpoints
+
+import (
+	"github.com/TeaOSLab/EdgeNode/internal/waf/requests"
+	"github.com/iwind/TeaGo/maps"
+)
+
+type RequestCNAMECheckpoint struct {
+	Checkpoint
+}
+
+func (this *RequestCNAMECheckpoint) RequestValue(req requests.Request, param string, options maps.Map, ruleId int64) (value interface{}, hasRequestBody bool, sysErr error, userErr error) {
+	value = req.Format("${cname}")
+	return
+}
+
+func (this *RequestCNAMECheckpoint) ResponseValue(req requests.Request, resp *requests.Response, param string, options maps.Map, ruleId int64) (value interface{}, hasRequestBody bool, sysErr error, userErr error) {
+	if this.IsRequest() {
+		return this.RequestValue(req, param, options, ruleId)
+	}
+	return
+}