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46 lines
1.4 KiB
Go
46 lines
1.4 KiB
Go
// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build tailscale_go
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// We want to use https://github.com/golang/go/issues/41048 but it's only in the
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// Tailscale Go tree for now. Hence the build tag above.
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package tshttpproxy
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import (
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"context"
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"fmt"
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"log"
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"net/http"
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"net/url"
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)
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const proxyAuthHeader = "Proxy-Authorization"
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func init() {
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condSetTransportGetProxyConnectHeader = func(tr *http.Transport) {
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tr.GetProxyConnectHeader = func(ctx context.Context, proxyURL *url.URL, target string) (http.Header, error) {
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v, err := GetAuthHeader(proxyURL)
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if err != nil {
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log.Printf("failed to get proxy Auth header for %v; ignoring: %v", proxyURL, err)
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return nil, nil
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}
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if v == "" {
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return nil, nil
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}
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return http.Header{proxyAuthHeader: []string{v}}, nil
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}
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tr.OnProxyConnectResponse = func(ctx context.Context, proxyURL *url.URL, connectReq *http.Request, res *http.Response) error {
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auth := connectReq.Header.Get(proxyAuthHeader)
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const truncLen = 20
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if len(auth) > truncLen {
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auth = fmt.Sprintf("%s...(%d total bytes)", auth[:truncLen], len(auth))
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}
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log.Printf("tshttpproxy: CONNECT response from %v for target %q (auth %q): %v", proxyURL, connectReq.Host, auth, res.Status)
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return nil
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}
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}
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}
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