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package http
import (
"bufio"
"bytes"
"fmt"
"io"
"net/http"
"strings"
"gopkg.in/src-d/go-git.v4/plumbing"
"gopkg.in/src-d/go-git.v4/plumbing/client/common"
"gopkg.in/src-d/go-git.v4/plumbing/format/packp/pktline"
)
// GitUploadPackService git-upoad-pack service over HTTP
type GitUploadPackService struct {
client *http.Client
endpoint common.Endpoint
auth HTTPAuthMethod
}
// NewGitUploadPackService connects to a git-upload-pack service over HTTP, the
// auth is extracted from the URL, or can be provided using the SetAuth method
func NewGitUploadPackService(endpoint common.Endpoint) common.GitUploadPackService {
s := &GitUploadPackService{
client: http.DefaultClient,
endpoint: endpoint,
}
s.setBasicAuthFromEndpoint()
return s
}
// Connect has not any effect, is here just for meet the interface
func (s *GitUploadPackService) Connect() error {
return nil
}
func (s *GitUploadPackService) setBasicAuthFromEndpoint() {
info := s.endpoint.User
if info == nil {
return
}
p, ok := info.Password()
if !ok {
return
}
u := info.Username()
s.auth = NewBasicAuth(u, p)
}
// SetAuth sets the AuthMethod
func (s *GitUploadPackService) SetAuth(auth common.AuthMethod) error {
httpAuth, ok := auth.(HTTPAuthMethod)
if !ok {
return common.ErrInvalidAuthMethod
}
s.auth = httpAuth
return nil
}
// Info returns the references info and capabilities from the service
func (s *GitUploadPackService) Info() (*common.GitUploadPackInfo, error) {
url := fmt.Sprintf(
"%s/info/refs?service=%s",
s.endpoint.String(), common.GitUploadPackServiceName,
)
res, err := s.doRequest("GET", url, nil)
if err != nil {
return nil, err
}
defer res.Body.Close()
i := common.NewGitUploadPackInfo()
return i, i.Decode(res.Body)
}
// Fetch request and returns a reader to a packfile
func (s *GitUploadPackService) Fetch(r *common.GitUploadPackRequest) (io.ReadCloser, error) {
url := fmt.Sprintf(
"%s/%s",
s.endpoint.String(), common.GitUploadPackServiceName,
)
res, err := s.doRequest("POST", url, r.Reader())
if err != nil {
return nil, err
}
reader := newBufferedReadCloser(res.Body)
if _, err := reader.Peek(1); err != nil {
if err == io.ErrUnexpectedEOF {
return nil, common.ErrEmptyGitUploadPack
}
return nil, err
}
if err := discardResponseInfo(reader); err != nil {
return nil, err
}
return reader, nil
}
func discardResponseInfo(r io.Reader) error {
s := pktline.NewScanner(r)
for s.Scan() {
if bytes.Equal(s.Bytes(), []byte{'N', 'A', 'K', '\n'}) {
break
}
}
return s.Err()
}
func (s *GitUploadPackService) doRequest(method, url string, content *strings.Reader) (*http.Response, error) {
var body io.Reader
if content != nil {
body = content
}
req, err := http.NewRequest(method, url, body)
if err != nil {
return nil, plumbing.NewPermanentError(err)
}
s.applyHeadersToRequest(req, content)
s.applyAuthToRequest(req)
res, err := s.client.Do(req)
if err != nil {
return nil, plumbing.NewUnexpectedError(err)
}
if err := NewHTTPError(res); err != nil {
return nil, err
}
return res, nil
}
func (s *GitUploadPackService) applyHeadersToRequest(req *http.Request, content *strings.Reader) {
req.Header.Add("User-Agent", "git/1.0")
req.Header.Add("Host", "github.com")
if content == nil {
req.Header.Add("Accept", "*/*")
} else {
req.Header.Add("Accept", "application/x-git-upload-pack-result")
req.Header.Add("Content-Type", "application/x-git-upload-pack-request")
req.Header.Add("Content-Length", string(content.Len()))
}
}
func (s *GitUploadPackService) applyAuthToRequest(req *http.Request) {
if s.auth == nil {
return
}
s.auth.setAuth(req)
}
// Disconnect do nothing
func (s *GitUploadPackService) Disconnect() (err error) {
return nil
}
type bufferedReadCloser struct {
*bufio.Reader
closer io.Closer
}
func newBufferedReadCloser(r io.ReadCloser) *bufferedReadCloser {
return &bufferedReadCloser{bufio.NewReader(r), r}
}
func (r *bufferedReadCloser) Close() error {
return r.closer.Close()
}
|
