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common.go
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common.go
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// Package common contains utils used by the clients
package common
import (
"errors"
"fmt"
"io"
"io/ioutil"
"strings"
"gopkg.in/src-d/go-git.v2/core"
"gopkg.in/src-d/go-git.v2/formats/pktline"
"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 GitUploadPackService interface {
Connect(url Endpoint) error
ConnectWithAuth(url Endpoint, auth AuthMethod) error
Info() (*GitUploadPackInfo, error)
Fetch(r *GitUploadPackRequest) (io.ReadCloser, error)
}
type AuthMethod interface {
Name() string
String() string
}
type Endpoint string
func NewEndpoint(url string) (Endpoint, error) {
vcs, err := vcsurl.Parse(url)
if err != nil {
return "", core.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 struct {
m map[string]*Capability
o []string
}
// Capability represents a server capability
type Capability struct {
Name string
Values []string
}
// NewCapabilities returns a new Capabilities struct
func NewCapabilities() *Capabilities {
return &Capabilities{
m: make(map[string]*Capability, 0),
}
}
// Decode decodes a string
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.Add(s[0], value)
}
}
// Get returns the values for a capability
func (c *Capabilities) Get(capability string) *Capability {
return c.m[capability]
}
// Set sets a capability removing the values
func (c *Capabilities) Set(capability string, values ...string) {
if _, ok := c.m[capability]; ok {
delete(c.m, capability)
}
c.Add(capability, values...)
}
// Add adds a capability, values are optional
func (c *Capabilities) Add(capability string, values ...string) {
if !c.Supports(capability) {
c.m[capability] = &Capability{Name: capability}
c.o = append(c.o, capability)
}
if len(values) == 0 {
return
}
c.m[capability].Values = append(c.m[capability].Values, values...)
}
// Supports returns true if capability is present
func (c *Capabilities) Supports(capability string) bool {
_, ok := c.m[capability]
return ok
}
// SymbolicReference returns the reference for a given symbolic reference
func (c *Capabilities) SymbolicReference(sym string) string {
if !c.Supports("symref") {
return ""
}
for _, symref := range c.Get("symref").Values {
parts := strings.Split(symref, ":")
if len(parts) != 2 {
continue
}
if parts[0] == sym {
return parts[1]
}
}
return ""
}
func (c *Capabilities) String() string {
if len(c.o) == 0 {
return ""
}
var o string
for _, key := range c.o {
cap := c.m[key]
added := false
for _, value := range cap.Values {
if value == "" {
continue
}
added = true
o += fmt.Sprintf("%s=%s ", key, value)
}
if len(cap.Values) == 0 || !added {
o += key + " "
}
}
if len(o) == 0 {
return o
}
return o[:len(o)-1]
}
type GitUploadPackInfo struct {
Capabilities *Capabilities
Head core.Hash
Refs map[string]core.Hash
}
func NewGitUploadPackInfo() *GitUploadPackInfo {
return &GitUploadPackInfo{Capabilities: NewCapabilities()}
}
func (r *GitUploadPackInfo) Decode(d *pktline.Decoder) error {
if err := r.read(d); err != nil {
if err == EmptyGitUploadPackErr {
return core.NewPermanentError(err)
}
return core.NewUnexpectedError(err)
}
return nil
}
func (r *GitUploadPackInfo) read(d *pktline.Decoder) error {
lines, err := d.ReadAll()
if err != nil {
return err
}
isEmpty := true
r.Refs = map[string]core.Hash{}
for _, line := range lines {
if !r.isValidLine(line) {
continue
}
if len(r.Capabilities.o) == 0 {
r.decodeHeaderLine(line)
continue
}
r.readLine(line)
isEmpty = false
}
if isEmpty {
return EmptyGitUploadPackErr
}
return nil
}
func (r *GitUploadPackInfo) decodeHeaderLine(line string) {
parts := strings.SplitN(line, " HEAD", 2)
r.Head = core.NewHash(parts[0])
r.Capabilities.Decode(line)
}
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]] = core.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\x00%s", 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 {
Wants []core.Hash
Haves []core.Hash
}
func (r *GitUploadPackRequest) Want(h ...core.Hash) {
r.Wants = append(r.Wants, h...)
}
func (r *GitUploadPackRequest) Have(h ...core.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 {
e := pktline.NewEncoder()
for _, want := range r.Wants {
e.AddLine(fmt.Sprintf("want %s", want))
}
for _, have := range r.Haves {
e.AddLine(fmt.Sprintf("have %s", have))
}
e.AddFlush()
e.AddLine("done")
return e.Reader()
}