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package git
import (
"fmt"
"io"
"net/http"
"net/url"
"strings"
"github.com/src-d/crawler/clients/common"
"github.com/src-d/crawler/clients/git/pktline"
"github.com/sourcegraph/go-vcsurl"
)
type Client struct {
url string
client *http.Client
}
func NewClient(url string) *Client {
vcs, _ := vcsurl.Parse(url)
return &Client{url: vcs.Link(), client: &http.Client{}}
}
func (c *Client) Refs() (*Refs, error) {
req, _ := c.buildRequest(
"GET",
fmt.Sprintf("%s/info/refs?service=git-upload-pack", c.url),
nil,
)
res, err := c.client.Do(req)
if err != nil {
return nil, err
}
if res.StatusCode >= 400 {
return nil, &common.ErrNotFound{c.url}
}
defer res.Body.Close()
d := pktline.NewDecoder(res.Body)
content, err := d.ReadAll()
if err != nil {
return nil, err
}
return c.buildRefsFromContent(content), nil
}
func (c *Client) buildRefsFromContent(content []string) *Refs {
refs := &Refs{branches: make(map[string]string, 0)}
for _, line := range content {
if line[0] == '#' {
continue
}
if refs.defaultBranch == "" {
refs.defaultBranch = c.getDefaultBranchFromLine(line)
} else {
commit, branch := c.getCommitAndBranch(line)
refs.branches[branch] = commit
}
}
return refs
}
func (c *Client) getDefaultBranchFromLine(line string) string {
args, _ := url.ParseQuery(strings.Replace(line, " ", "&", -1))
link, ok := args["symref"]
if !ok {
return ""
}
parts := strings.Split(link[0], ":")
if len(parts) != 2 || parts[0] != "HEAD" {
return ""
}
return parts[1]
}
func (c *Client) getCommitAndBranch(line string) (string, string) {
parts := strings.Split(strings.Trim(line, " \n"), " ")
if len(parts) != 2 {
return "", ""
}
return parts[0], parts[1]
}
func (c *Client) PackFile(want string) (io.ReadCloser, error) {
e := pktline.NewEncoder()
e.AddLine(fmt.Sprintf("want %s", want))
e.AddFlush()
e.AddLine("done")
req, err := c.buildRequest(
"POST",
fmt.Sprintf("%s/git-upload-pack", c.url),
e.GetReader(),
)
if err != nil {
return nil, err
}
res, err := c.client.Do(req)
if err != nil {
return nil, err
}
h := make([]byte, 8)
if _, err := res.Body.Read(h); err != nil {
return nil, err
}
return res.Body, nil
}
func (c *Client) buildRequest(method, url string, content *strings.Reader) (*http.Request, error) {
var req *http.Request
var err error
if content == nil {
req, err = http.NewRequest(method, url, nil)
} else {
req, err = http.NewRequest(method, url, content)
}
if err != nil {
return nil, err
}
c.applyHeadersToRequest(req, content)
return req, nil
}
func (c *Client) 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()))
}
}
type Refs struct {
defaultBranch string
branches map[string]string
}
func (r *Refs) DefaultBranch() string {
return r.defaultBranch
}
func (r *Refs) DefaultBranchCommit() string {
return r.branches[r.defaultBranch]
}
func (r *Refs) Branches() map[string]string {
return r.branches
}
|
