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package common
import (
"errors"
"fmt"
"io/ioutil"
"net/url"
"strings"
"gopkg.in/src-d/go-git.v2/formats/pktline"
"gopkg.in/src-d/go-git.v2/internal"
"gopkg.in/sourcegraph/go-vcsurl.v1"
)
var (
NotFoundErr = errors.New("repository not found")
EmptyGitUploadPackErr = errors.New("empty git-upload-pack given")
)
const GitUploadPackServiceName = "git-upload-pack"
type Endpoint string
func NewEndpoint(url string) (Endpoint, error) {
vcs, err := vcsurl.Parse(url)
if err != nil {
return "", NewPermanentError(err)
}
link := vcs.Link()
if !strings.HasSuffix(link, ".git") {
link += ".git"
}
return Endpoint(link), nil
}
func (e Endpoint) Service(name string) string {
return fmt.Sprintf("%s/info/refs?service=%s", e, name)
}
// Capabilities contains all the server capabilities
// https://github.com/git/git/blob/master/Documentation/technical/protocol-capabilities.txt
type Capabilities map[string][]string
func parseCapabilities(line string) Capabilities {
values, _ := url.ParseQuery(strings.Replace(line, " ", "&", -1))
return Capabilities(values)
}
func (c Capabilities) Decode(raw string) {
parts := strings.SplitN(raw, "HEAD", 2)
if len(parts) == 2 {
raw = parts[1]
}
params := strings.Split(raw, " ")
for _, p := range params {
s := strings.SplitN(p, "=", 2)
var value string
if len(s) == 2 {
value = s[1]
}
c[s[0]] = append(c[s[0]], value)
}
}
func (c Capabilities) String() string {
var o string
for key, values := range c {
if len(values) == 0 {
o += key + " "
}
for _, value := range values {
o += fmt.Sprintf("%s=%s ", key, value)
}
}
return o[:len(o)-1]
}
// Supports returns true if capability is preent
func (r Capabilities) Supports(capability string) bool {
_, ok := r[capability]
return ok
}
// Get returns the values for a capability
func (r Capabilities) Get(capability string) []string {
return r[capability]
}
// SymbolicReference returns the reference for a given symbolic reference
func (r Capabilities) SymbolicReference(sym string) string {
if !r.Supports("symref") {
return ""
}
for _, symref := range r.Get("symref") {
parts := strings.Split(symref, ":")
if len(parts) != 2 {
continue
}
if parts[0] == sym {
return parts[1]
}
}
return ""
}
type GitUploadPackInfo struct {
Capabilities Capabilities
Head string
Refs map[string]internal.Hash
}
func NewGitUploadPackInfo(d *pktline.Decoder) (*GitUploadPackInfo, error) {
info := &GitUploadPackInfo{}
if err := info.read(d); err != nil {
if err == EmptyGitUploadPackErr {
return nil, NewPermanentError(err)
}
return nil, NewUnexpectedError(err)
}
return info, nil
}
func (r *GitUploadPackInfo) read(d *pktline.Decoder) error {
lines, err := d.ReadAll()
if err != nil {
return err
}
isEmpty := true
r.Refs = map[string]internal.Hash{}
for _, line := range lines {
if !r.isValidLine(line) {
continue
}
if r.Capabilities == nil {
r.Capabilities = Capabilities{}
r.Capabilities.Decode(line)
continue
}
r.readLine(line)
isEmpty = false
}
if isEmpty {
return EmptyGitUploadPackErr
}
return nil
}
func (r *GitUploadPackInfo) isValidLine(line string) bool {
if line[0] == '#' {
return false
}
return true
}
func (r *GitUploadPackInfo) readLine(line string) {
parts := strings.Split(strings.Trim(line, " \n"), " ")
if len(parts) != 2 {
return
}
r.Refs[parts[1]] = internal.NewHash(parts[0])
}
func (r *GitUploadPackInfo) String() string {
return string(r.Bytes())
}
func (r *GitUploadPackInfo) Bytes() []byte {
e := pktline.NewEncoder()
e.AddLine("# service=git-upload-pack")
e.AddFlush()
e.AddLine(fmt.Sprintf("%s HEAD%s", r.Refs[r.Head], r.Capabilities.String()))
for name, id := range r.Refs {
e.AddLine(fmt.Sprintf("%s %s", id, name))
}
e.AddFlush()
b, _ := ioutil.ReadAll(e.Reader())
return b
}
type GitUploadPackRequest struct {
Want []internal.Hash
Have []internal.Hash
}
func (r *GitUploadPackRequest) String() string {
b, _ := ioutil.ReadAll(r.Reader())
return string(b)
}
func (r *GitUploadPackRequest) Reader() *strings.Reader {
e := pktline.NewEncoder()
for _, want := range r.Want {
e.AddLine(fmt.Sprintf("want %s", want))
}
for _, have := range r.Have {
e.AddLine(fmt.Sprintf("have %s", have))
}
e.AddFlush()
e.AddLine("done")
return e.Reader()
}
type PermanentError struct {
err error
}
func NewPermanentError(err error) *PermanentError {
if err == nil {
return nil
}
return &PermanentError{err: err}
}
func (e *PermanentError) Error() string {
return fmt.Sprintf("permanent client error: %s", e.err.Error())
}
type UnexpectedError struct {
err error
}
func NewUnexpectedError(err error) *UnexpectedError {
if err == nil {
return nil
}
return &UnexpectedError{err: err}
}
func (e *UnexpectedError) Error() string {
return fmt.Sprintf("unexpected client error: %s", e.err.Error())
}
|
