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// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package tshttpproxy contains Tailscale additions to httpproxy not available
// in golang.org/x/net/http/httpproxy. Notably, it aims to support Windows better.
package tshttpproxy
import (
"net/http"
"net/url"
"os"
)
// sysProxyFromEnv, if non-nil, specifies a platform-specific ProxyFromEnvironment
// func to use if http.ProxyFromEnvironment doesn't return a proxy.
// For example, WPAD PAC files on Windows.
var sysProxyFromEnv func(*http.Request) (*url.URL, error)
func ProxyFromEnvironment(req *http.Request) (*url.URL, error) {
u, err := http.ProxyFromEnvironment(req)
if u != nil && err == nil {
return u, nil
}
if sysProxyFromEnv != nil {
u, err := sysProxyFromEnv(req)
if u != nil && err == nil {
return u, nil
}
}
return nil, err
}
var sysAuthHeader func(*url.URL) (string, error)
// GetAuthHeader returns the Authorization header value to send to proxy u.
func GetAuthHeader(u *url.URL) (string, error) {
if fake := os.Getenv("TS_DEBUG_FAKE_PROXY_AUTH"); fake != "" {
return fake, nil
}
if sysAuthHeader != nil {
return sysAuthHeader(u)
}
return "", nil
}
var condSetTransportGetProxyConnectHeader func(*http.Transport)
// SetTarnsportGetProxyConnectHeader sets the provided Transport's
// GetProxyConnectHeader field, if the current build of Go supports
// it.
//
// See https://github.com/golang/go/issues/41048.
func SetTransportGetProxyConnectHeader(tr *http.Transport) {
if f := condSetTransportGetProxyConnectHeader; f != nil {
f(tr)
}
}
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