refactor: separate API handlers into dedicated packages with improved HTTP utilities (#5127)

pkg/util/http/context.go

@@ -0,0 +1,57 @@
+// Copyright 2025 The frp 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 http
+
+import (
+	"encoding/json"
+	"io"
+	"net/http"
+
+	"github.com/gorilla/mux"
+)
+
+type Context struct {
+	Req  *http.Request
+	Resp http.ResponseWriter
+	vars map[string]string
+}
+
+func NewContext(w http.ResponseWriter, r *http.Request) *Context {
+	return &Context{
+		Req:  r,
+		Resp: w,
+		vars: mux.Vars(r),
+	}
+}
+
+func (c *Context) Param(key string) string {
+	return c.vars[key]
+}
+
+func (c *Context) Query(key string) string {
+	return c.Req.URL.Query().Get(key)
+}
+
+func (c *Context) BindJSON(obj any) error {
+	body, err := io.ReadAll(c.Req.Body)
+	if err != nil {
+		return err
+	}
+	return json.Unmarshal(body, obj)
+}
+
+func (c *Context) Body() ([]byte, error) {
+	return io.ReadAll(c.Req.Body)
+}