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Copy pathhttp.go
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243 lines (204 loc) · 5.46 KB
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package git
import (
"errors"
"fmt"
"io"
"net/http"
"net/url"
"sync"
)
// RegisterManagedHTTPTransport registers a Go-native implementation of an
// HTTP/S transport that doesn't rely on any system libraries (e.g.
// libopenssl/libmbedtls).
//
// If Shutdown or ReInit are called, make sure that the smart transports are
// freed before it.
func RegisterManagedHTTPTransport(protocol string) (*RegisteredSmartTransport, error) {
return NewRegisteredSmartTransport(protocol, true, httpSmartSubtransportFactory)
}
func registerManagedHTTP() error {
globalRegisteredSmartTransports.Lock()
defer globalRegisteredSmartTransports.Unlock()
for _, protocol := range []string{"http", "https"} {
if _, ok := globalRegisteredSmartTransports.transports[protocol]; ok {
continue
}
managed, err := newRegisteredSmartTransport(protocol, true, httpSmartSubtransportFactory, true)
if err != nil {
return fmt.Errorf("failed to register transport for %q: %v", protocol, err)
}
globalRegisteredSmartTransports.transports[protocol] = managed
}
return nil
}
func httpSmartSubtransportFactory(remote *Remote, transport *Transport) (SmartSubtransport, error) {
var proxyFn func(*http.Request) (*url.URL, error)
remoteConnectOpts, err := transport.SmartRemoteConnectOptions()
if err != nil {
return nil, err
}
switch remoteConnectOpts.ProxyOptions.Type {
case ProxyTypeNone:
proxyFn = nil
case ProxyTypeAuto:
proxyFn = http.ProxyFromEnvironment
case ProxyTypeSpecified:
parsedUrl, err := url.Parse(remoteConnectOpts.ProxyOptions.Url)
if err != nil {
return nil, err
}
proxyFn = http.ProxyURL(parsedUrl)
}
return &httpSmartSubtransport{
transport: transport,
client: &http.Client{
Transport: &http.Transport{
Proxy: proxyFn,
},
},
}, nil
}
type httpSmartSubtransport struct {
transport *Transport
client *http.Client
}
func (t *httpSmartSubtransport) Action(url string, action SmartServiceAction) (SmartSubtransportStream, error) {
var req *http.Request
var err error
switch action {
case SmartServiceActionUploadpackLs:
req, err = http.NewRequest("GET", url+"/info/refs?service=git-upload-pack", nil)
case SmartServiceActionUploadpack:
req, err = http.NewRequest("POST", url+"/git-upload-pack", nil)
if err != nil {
break
}
req.Header.Set("Content-Type", "application/x-git-upload-pack-request")
case SmartServiceActionReceivepackLs:
req, err = http.NewRequest("GET", url+"/info/refs?service=git-receive-pack", nil)
case SmartServiceActionReceivepack:
req, err = http.NewRequest("POST", url+"/info/refs?service=git-upload-pack", nil)
if err != nil {
break
}
req.Header.Set("Content-Type", "application/x-git-receive-pack-request")
default:
err = errors.New("unknown action")
}
if err != nil {
return nil, err
}
req.Header.Set("User-Agent", "git/2.0 (git2go)")
stream := newManagedHttpStream(t, req)
if req.Method == "POST" {
stream.recvReply.Add(1)
stream.sendRequestBackground()
}
return stream, nil
}
func (t *httpSmartSubtransport) Close() error {
return nil
}
func (t *httpSmartSubtransport) Free() {
t.client = nil
}
type httpSmartSubtransportStream struct {
owner *httpSmartSubtransport
req *http.Request
resp *http.Response
reader *io.PipeReader
writer *io.PipeWriter
sentRequest bool
recvReply sync.WaitGroup
httpError error
}
func newManagedHttpStream(owner *httpSmartSubtransport, req *http.Request) *httpSmartSubtransportStream {
r, w := io.Pipe()
return &httpSmartSubtransportStream{
owner: owner,
req: req,
reader: r,
writer: w,
}
}
func (self *httpSmartSubtransportStream) Read(buf []byte) (int, error) {
if !self.sentRequest {
self.recvReply.Add(1)
if err := self.sendRequest(); err != nil {
return 0, err
}
}
if err := self.writer.Close(); err != nil {
return 0, err
}
self.recvReply.Wait()
if self.httpError != nil {
return 0, self.httpError
}
return self.resp.Body.Read(buf)
}
func (self *httpSmartSubtransportStream) Write(buf []byte) (int, error) {
if self.httpError != nil {
return 0, self.httpError
}
return self.writer.Write(buf)
}
func (self *httpSmartSubtransportStream) Free() {
if self.resp != nil {
self.resp.Body.Close()
}
}
func (self *httpSmartSubtransportStream) sendRequestBackground() {
go func() {
self.httpError = self.sendRequest()
}()
self.sentRequest = true
}
func (self *httpSmartSubtransportStream) sendRequest() error {
defer self.recvReply.Done()
self.resp = nil
var resp *http.Response
var err error
var userName string
var password string
for {
req := &http.Request{
Method: self.req.Method,
URL: self.req.URL,
Header: self.req.Header,
}
if req.Method == "POST" {
req.Body = self.reader
req.ContentLength = -1
}
if userName != "" && password != "" {
req.SetBasicAuth(userName, password)
}
resp, err = http.DefaultClient.Do(req)
if err != nil {
return err
}
if resp.StatusCode == http.StatusOK {
break
}
if resp.StatusCode == http.StatusUnauthorized {
resp.Body.Close()
cred, err := self.owner.transport.SmartCredentials("", CredentialTypeUserpassPlaintext)
if err != nil {
return err
}
defer cred.Free()
userName, password, err = cred.GetUserpassPlaintext()
if err != nil {
return err
}
continue
}
// Any other error we treat as a hard error and punt back to the caller
resp.Body.Close()
return fmt.Errorf("Unhandled HTTP error %s", resp.Status)
}
self.sentRequest = true
self.resp = resp
return nil
}