1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
|
package common
import (
"errors"
"fmt"
"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 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)
}
}
// 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
}
// Get returns the values for a capability
func (c *Capabilities) Get(capability string) *Capability {
return c.m[capability]
}
// 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]
if len(cap.Values) == 0 {
o += key + " "
}
for _, value := range cap.Values {
o += fmt.Sprintf("%s=%s ", key, value)
}
}
return o[:len(o)-1]
}
type GitUploadPackInfo struct {
Capabilities *Capabilities
Head string
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.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]] = 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.Refs[r.Head].String(), 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 []core.Hash
Have []core.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()
}
|
