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// Copyright 2012 Google Inc. All Rights Reserved.

//

// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

//

// http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

package main

import (

"bufio"

"errors"

"fmt"

"net"

"net/url"

"os"

"os/exec"

"strings"

"syscall"

"time"

)

type Client struct {

ProxyBin string

Args []string

insecure bool

}

func (c *Client) Run() error {

if err := c.resolveArgs(); err != nil {

return fmt.Errorf("resolveArgs() got error: %v", err)

}

// Connect to the proxy.

uconn, hconn, addr, err := c.connect()

if err != nil {

return fmt.Errorf("connect() got error: %v", err)

}

// Keep the unix socket connection open for the duration of the request.

defer uconn.Close()

// Keep a connection to the HTTP server open, so no other user can

// bind on the same address so long as the process is running.

defer hconn.Close()

// Start the git-remote-http subprocess.

cargs := []string{"-c", fmt.Sprintf("http.proxy=%v", addr), "remote-http"}

cargs = append(cargs, c.Args...)

cmd := exec.Command("git", cargs...)

for _, v := range os.Environ() {

if !strings.HasPrefix(v, "GIT_PERSISTENT_HTTPS_SECURE=") {

cmd.Env = append(cmd.Env, v)

}

}

// Set the GIT_PERSISTENT_HTTPS_SECURE environment variable when

// the proxy is using a SSL connection. This allows credential helpers

// to identify secure proxy connections, despite being passed an HTTP

// scheme.

if !c.insecure {

cmd.Env = append(cmd.Env, "GIT_PERSISTENT_HTTPS_SECURE=1")

}

cmd.Stdin = os.Stdin

cmd.Stdout = os.Stdout

cmd.Stderr = os.Stderr

if err := cmd.Run(); err != nil {

if eerr, ok := err.(*exec.ExitError); ok {

if stat, ok := eerr.ProcessState.Sys().(syscall.WaitStatus); ok && stat.ExitStatus() != 0 {

os.Exit(stat.ExitStatus())

}

}

return fmt.Errorf("git-remote-http subprocess got error: %v", err)

}

return nil

}

func (c *Client) connect() (uconn net.Conn, hconn net.Conn, addr string, err error) {

uconn, err = DefaultSocket.Dial()

if err != nil {

if e, ok := err.(*net.OpError); ok && (os.IsNotExist(e.Err) || e.Err == syscall.ECONNREFUSED) {

if err = c.startProxy(); err == nil {

uconn, err = DefaultSocket.Dial()

}

}

if err != nil {

return

}

}

if addr, err = c.readAddr(uconn); err != nil {

return

}

// Open a tcp connection to the proxy.

if hconn, err = net.Dial("tcp", addr); err != nil {

return

}

// Verify the address hasn't changed ownership.

var addr2 string

if addr2, err = c.readAddr(uconn); err != nil {

return

} else if addr != addr2 {

err = fmt.Errorf("address changed after connect. got %q, want %q", addr2, addr)

return

}

return

}

func (c *Client) readAddr(conn net.Conn) (string, error) {

conn.SetDeadline(time.Now().Add(5 * time.Second))

data := make([]byte, 100)

n, err := conn.Read(data)

if err != nil {

return "", fmt.Errorf("error reading unix socket: %v", err)

} else if n == 0 {

return "", errors.New("empty data response")

}

conn.Write([]byte{1}) // Ack

var addr string

if addrs := strings.Split(string(data[:n]), "\n"); len(addrs) != 2 {

return "", fmt.Errorf("got %q, wanted 2 addresses", data[:n])

} else if c.insecure {

addr = addrs[1]

} else {

addr = addrs[0]

}

return addr, nil

}

func (c *Client) startProxy() error {

cmd := exec.Command(c.ProxyBin)

cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}

stdout, err := cmd.StdoutPipe()

if err != nil {

return err

}

defer stdout.Close()

if err := cmd.Start(); err != nil {

return err

}

result := make(chan error)

go func() {

bytes, _, err := bufio.NewReader(stdout).ReadLine()

if line := string(bytes); err == nil && line != "OK" {

err = fmt.Errorf("proxy returned %q, want \"OK\"", line)

}

result <- err

}()

select {

case err := <-result:

return err

case <-time.After(5 * time.Second):

return errors.New("timeout waiting for proxy to start")

}

panic("not reachable")

}

func (c *Client) resolveArgs() error {

if nargs := len(c.Args); nargs == 0 {

return errors.New("remote needed")

} else if nargs > 2 {

return fmt.Errorf("want at most 2 args, got %v", c.Args)

}

// Rewrite the url scheme to be http.

idx := len(c.Args) - 1

rawurl := c.Args[idx]

rurl, err := url.Parse(rawurl)

if err != nil {

return fmt.Errorf("invalid remote: %v", err)

}

c.insecure = rurl.Scheme == "persistent-http"

rurl.Scheme = "http"

c.Args[idx] = rurl.String()

if idx != 0 && c.Args[0] == rawurl {

c.Args[0] = c.Args[idx]

}

return nil

}