Add proxy pkg.

proxy/proxy.go

@@ -0,0 +1,55 @@
+// Copyright 2021 The casbin Authors. All Rights Reserved.
+//
+// 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 proxy
+
+import (
+	"net/http"
+
+	"github.com/astaxie/beego"
+	"golang.org/x/net/proxy"
+)
+
+var DefaultHttpClient *http.Client
+var ProxyHttpClient *http.Client
+
+func InitHttpClient() {
+	// not use proxy
+	DefaultHttpClient = http.DefaultClient
+
+	// use proxy
+	httpProxy := beego.AppConfig.String("httpProxy")
+	if httpProxy == "" {
+		ProxyHttpClient = &http.Client{}
+		return
+	}
+
+	// https://stackoverflow.com/questions/33585587/creating-a-go-socks5-client
+	dialer, err := proxy.SOCKS5("tcp", httpProxy, nil, proxy.Direct)
+	if err != nil {
+		panic(err)
+	}
+
+	tr := &http.Transport{Dial: dialer.Dial}
+	ProxyHttpClient = &http.Client{
+		Transport: tr,
+	}
+
+	//resp, err2 := ProxyHttpClient.Get("https://google.com")
+	//if err2 != nil {
+	//	panic(err2)
+	//}
+	//defer resp.Body.Close()
+	//println("Response status: %s", resp.Status)
+}