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tailscale/net/tshttpproxy/tshttpproxy.go

44 lines
1.2 KiB
Go

// 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"
)
// 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 sysAuthHeader != nil {
return sysAuthHeader(u)
}
return "", nil
}