110 lines
2.1 KiB
Go
110 lines
2.1 KiB
Go
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package http
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import (
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"bufio"
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"encoding/base64"
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"fmt"
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"io"
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"net"
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"net/http"
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"net/http/httputil"
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"net/url"
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)
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const (
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proxyAuthHeader = "Proxy-Authorization"
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)
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func getURL(addr string) (*url.URL, error) {
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r := &http.Request{
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URL: &url.URL{
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Scheme: "https",
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Host: addr,
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},
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}
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return http.ProxyFromEnvironment(r)
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}
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type pbuffer struct {
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net.Conn
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r io.Reader
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}
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func (p *pbuffer) Read(b []byte) (int, error) {
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return p.r.Read(b)
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}
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func proxyDial(conn net.Conn, addr string, proxyURL *url.URL) (_ net.Conn, err error) {
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defer func() {
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if err != nil {
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conn.Close()
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}
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}()
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r := &http.Request{
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Method: http.MethodConnect,
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URL: &url.URL{Host: addr},
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Header: map[string][]string{"User-Agent": {"micro/latest"}},
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}
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if user := proxyURL.User; user != nil {
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u := user.Username()
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p, _ := user.Password()
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auth := []byte(u + ":" + p)
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basicAuth := base64.StdEncoding.EncodeToString(auth)
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r.Header.Add(proxyAuthHeader, "Basic "+basicAuth)
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}
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if err := r.Write(conn); err != nil {
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return nil, fmt.Errorf("failed to write the HTTP request: %v", err)
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}
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br := bufio.NewReader(conn)
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rsp, err := http.ReadResponse(br, r)
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if err != nil {
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return nil, fmt.Errorf("reading server HTTP response: %v", err)
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}
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defer rsp.Body.Close()
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if rsp.StatusCode != http.StatusOK {
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dump, err := httputil.DumpResponse(rsp, true)
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if err != nil {
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return nil, fmt.Errorf("failed to do connect handshake, status code: %s", rsp.Status)
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}
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return nil, fmt.Errorf("failed to do connect handshake, response: %q", dump)
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}
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return &pbuffer{Conn: conn, r: br}, nil
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}
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// Creates a new connection
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func newConn(dial func(string) (net.Conn, error)) func(string) (net.Conn, error) {
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return func(addr string) (net.Conn, error) {
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// get the proxy url
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proxyURL, err := getURL(addr)
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if err != nil {
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return nil, err
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}
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// set to addr
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callAddr := addr
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// got proxy
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if proxyURL != nil {
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callAddr = proxyURL.Host
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}
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// dial the addr
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c, err := dial(callAddr)
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if err != nil {
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return nil, err
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}
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// do proxy connect if we have proxy url
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if proxyURL != nil {
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c, err = proxyDial(c, addr, proxyURL)
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}
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return c, err
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}
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}
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