websocket/proxy.go

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// Copyright 2017 The Gorilla WebSocket 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 websocket
import (
"bufio"
"encoding/base64"
"errors"
"net"
"net/http"
"net/url"
"strings"
"golang.org/x/net/proxy"
)
type netDialerFunc func(network, addr string) (net.Conn, error)
func (fn netDialerFunc) Dial(network, addr string) (net.Conn, error) {
return fn(network, addr)
}
func init() {
proxy.RegisterDialerType("http", func(proxyURL *url.URL, forwardDialer proxy.Dialer) (proxy.Dialer, error) {
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return &httpProxyDialer{proxyURL: proxyURL, forwardDial: forwardDialer.Dial}, nil
})
}
type httpProxyDialer struct {
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proxyURL *url.URL
forwardDial func(network, addr string) (net.Conn, error)
}
func (hpd *httpProxyDialer) Dial(network string, addr string) (net.Conn, error) {
hostPort, _ := hostPortNoPort(hpd.proxyURL)
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conn, err := hpd.forwardDial(network, hostPort)
if err != nil {
return nil, err
}
connectHeader := make(http.Header)
if user := hpd.proxyURL.User; user != nil {
proxyUser := user.Username()
if proxyPassword, passwordSet := user.Password(); passwordSet {
credential := base64.StdEncoding.EncodeToString([]byte(proxyUser + ":" + proxyPassword))
connectHeader.Set("Proxy-Authorization", "Basic "+credential)
}
}
connectReq := &http.Request{
Method: http.MethodConnect,
URL: &url.URL{Opaque: addr},
Host: addr,
Header: connectHeader,
}
if err := connectReq.Write(conn); err != nil {
// As mentioned in https://github.com/gorilla/websocket/pull/897#issuecomment-1947108098:
// It's safe to ignore the errors for conn.Close()
conn.Close() //#nosec G104 (CWE-703): Errors unhandled
return nil, err
}
// Read response. It's OK to use and discard buffered reader here becaue
// the remote server does not speak until spoken to.
br := bufio.NewReader(conn)
resp, err := http.ReadResponse(br, connectReq)
if err != nil {
conn.Close() //#nosec G104 (CWE-703): Errors unhandled
return nil, err
}
Use status code constant (#864) <!-- For Work In Progress Pull Requests, please use the Draft PR feature, see https://github.blog/2019-02-14-introducing-draft-pull-requests/ for further details. For a timely review/response, please avoid force-pushing additional commits if your PR already received reviews or comments. Before submitting a Pull Request, please ensure that you have: - 📖 Read the Contributing guide: https://github.com/gorilla/.github/blob/main/CONTRIBUTING.md - 📖 Read the Code of Conduct: https://github.com/gorilla/.github/blob/main/CODE_OF_CONDUCT.md - Provide tests for your changes. - Use descriptive commit messages. - Comment your code where appropriate. - Squash your commits - Update any related documentation. - Add gorilla/pull-request-reviewers as a Reviewer --> ## What type of PR is this? (check all applicable) - [x] Refactor - [ ] Feature - [ ] Bug Fix - [ ] Optimization - [ ] Documentation Update - [ ] Go Version Update - [ ] Dependency Update ## Description ## Related Tickets & Documents <!-- For pull requests that relate or close an issue, please include them below. We like to follow [Github's guidance on linking issues to pull requests](https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue). For example having the text: "closes #1234" would connect the current pull request to issue 1234. And when we merge the pull request, Github will automatically close the issue. --> - Related Issue # - Closes # ## Added/updated tests? - [ ] Yes - [x] No - [ ] I need help with writing tests ## Run verifications and test - [ ] `make verify` is passing - [ ] `make test` is passing
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if resp.StatusCode != http.StatusOK {
conn.Close() //#nosec G104 (CWE-703): Errors unhandled
f := strings.SplitN(resp.Status, " ", 2)
return nil, errors.New(f[1])
}
return conn, nil
}