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// Package common contains interfaces and non-specific protocol entities
package common
import (
"bytes"
"errors"
"fmt"
"io"
"io/ioutil"
"net/url"
"regexp"
"strings"
"gopkg.in/src-d/go-git.v4/plumbing"
"gopkg.in/src-d/go-git.v4/plumbing/format/packp"
"gopkg.in/src-d/go-git.v4/plumbing/format/packp/advrefs"
"gopkg.in/src-d/go-git.v4/plumbing/format/packp/pktline"
"gopkg.in/src-d/go-git.v4/plumbing/storer"
"gopkg.in/src-d/go-git.v4/storage/memory"
)
var (
ErrRepositoryNotFound = errors.New("repository not found")
ErrAuthorizationRequired = errors.New("authorization required")
ErrEmptyGitUploadPack = errors.New("empty git-upload-pack given")
ErrInvalidAuthMethod = errors.New("invalid auth method")
)
const GitUploadPackServiceName = "git-upload-pack"
type GitUploadPackService interface {
Connect() error
SetAuth(AuthMethod) error
Info() (*GitUploadPackInfo, error)
Fetch(*GitUploadPackRequest) (io.ReadCloser, error)
Disconnect() error
}
// GitUploadPackServiceFactory is capable of instantiating GitUploadPackService with given endpoint
type GitUploadPackServiceFactory func(Endpoint) GitUploadPackService
type AuthMethod interface {
Name() string
String() string
}
type Endpoint url.URL
var (
isSchemeRegExp = regexp.MustCompile("^[^:]+://")
scpLikeUrlRegExp = regexp.MustCompile("^(?P<user>[^@]+@)?(?P<host>[^:]+):/?(?P<path>.+)$")
)
func NewEndpoint(endpoint string) (Endpoint, error) {
endpoint = transformSCPLikeIfNeeded(endpoint)
u, err := url.Parse(endpoint)
if err != nil {
return Endpoint{}, plumbing.NewPermanentError(err)
}
if !u.IsAbs() {
return Endpoint{}, plumbing.NewPermanentError(fmt.Errorf(
"invalid endpoint: %s", endpoint,
))
}
return Endpoint(*u), nil
}
func transformSCPLikeIfNeeded(endpoint string) string {
if !isSchemeRegExp.MatchString(endpoint) && scpLikeUrlRegExp.MatchString(endpoint) {
m := scpLikeUrlRegExp.FindStringSubmatch(endpoint)
return fmt.Sprintf("ssh://%s%s/%s", m[1], m[2], m[3])
}
return endpoint
}
func (e *Endpoint) String() string {
u := url.URL(*e)
return u.String()
}
type GitUploadPackInfo struct {
Capabilities *packp.Capabilities
Refs memory.ReferenceStorage
}
func NewGitUploadPackInfo() *GitUploadPackInfo {
return &GitUploadPackInfo{
Capabilities: packp.NewCapabilities(),
Refs: make(memory.ReferenceStorage, 0),
}
}
func (i *GitUploadPackInfo) Decode(r io.Reader) error {
d := advrefs.NewDecoder(r)
ar := advrefs.New()
if err := d.Decode(ar); err != nil {
if err == advrefs.ErrEmpty {
return plumbing.NewPermanentError(err)
}
return plumbing.NewUnexpectedError(err)
}
i.Capabilities = ar.Capabilities
if err := i.addRefs(ar); err != nil {
return plumbing.NewUnexpectedError(err)
}
return nil
}
func (i *GitUploadPackInfo) addRefs(ar *advrefs.AdvRefs) error {
for name, hash := range ar.References {
ref := plumbing.NewReferenceFromStrings(name, hash.String())
i.Refs.SetReference(ref)
}
return i.addSymbolicRefs(ar)
}
func (i *GitUploadPackInfo) addSymbolicRefs(ar *advrefs.AdvRefs) error {
if !hasSymrefs(ar) {
return nil
}
for _, symref := range ar.Capabilities.Get("symref").Values {
chunks := strings.Split(symref, ":")
if len(chunks) != 2 {
err := fmt.Errorf("bad number of `:` in symref value (%q)", symref)
return plumbing.NewUnexpectedError(err)
}
name := plumbing.ReferenceName(chunks[0])
target := plumbing.ReferenceName(chunks[1])
ref := plumbing.NewSymbolicReference(name, target)
i.Refs.SetReference(ref)
}
return nil
}
func hasSymrefs(ar *advrefs.AdvRefs) bool {
return ar.Capabilities.Supports("symref")
}
func (i *GitUploadPackInfo) Head() *plumbing.Reference {
ref, _ := storer.ResolveReference(i.Refs, plumbing.HEAD)
return ref
}
func (i *GitUploadPackInfo) String() string {
return string(i.Bytes())
}
func (i *GitUploadPackInfo) Bytes() []byte {
var buf bytes.Buffer
e := pktline.NewEncoder(&buf)
_ = e.EncodeString("# service=git-upload-pack\n")
// inserting a flush-pkt here violates the protocol spec, but some
// servers do it, like Github.com
e.Flush()
_ = e.Encodef("%s HEAD\x00%s\n", i.Head().Hash(), i.Capabilities.String())
for _, ref := range i.Refs {
if ref.Type() != plumbing.HashReference {
continue
}
_ = e.Encodef("%s %s\n", ref.Hash(), ref.Name())
}
e.Flush()
return buf.Bytes()
}
type GitUploadPackRequest struct {
Wants []plumbing.Hash
Haves []plumbing.Hash
Depth int
}
func (r *GitUploadPackRequest) Want(h ...plumbing.Hash) {
r.Wants = append(r.Wants, h...)
}
func (r *GitUploadPackRequest) Have(h ...plumbing.Hash) {
r.Haves = append(r.Haves, h...)
}
func (r *GitUploadPackRequest) String() string {
b, _ := ioutil.ReadAll(r.Reader())
return string(b)
}
func (r *GitUploadPackRequest) Reader() *strings.Reader {
var buf bytes.Buffer
e := pktline.NewEncoder(&buf)
for _, want := range r.Wants {
_ = e.Encodef("want %s\n", want)
}
for _, have := range r.Haves {
_ = e.Encodef("have %s\n", have)
}
if r.Depth != 0 {
_ = e.Encodef("deepen %d\n", r.Depth)
}
_ = e.Flush()
_ = e.EncodeString("done\n")
return strings.NewReader(buf.String())
}
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