feat: manually mirror opencoze's code from bytedance

Change-Id: I09a73aadda978ad9511264a756b2ce51f5761adf

backend/pkg/hertzutil/domain/origin_host.go

@@ -0,0 +1,45 @@
+/*
+ * Copyright 2025 coze-dev Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package domain
+
+import (
+	"net/url"
+
+	"github.com/cloudwego/hertz/pkg/app"
+)
+
+const (
+	HeaderKeyOfOrigin = "Origin"
+	HeaderKeyOfHost   = "Host"
+)
+
+func GetOriginHost(c *app.RequestContext) string {
+	origin := c.Request.Header.Get(HeaderKeyOfOrigin)
+	if origin != "" {
+		u, err := url.Parse(origin)
+		if err == nil {
+			return u.Hostname()
+		}
+	}
+
+	host := c.Request.Header.Get(HeaderKeyOfHost)
+	if host != "" {
+		return host
+	}
+
+	return string(c.Request.URI().Host())
+}