/
github.go
139 lines (118 loc) · 2.83 KB
/
github.go
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package github
import (
"bytes"
"errors"
"fmt"
"io/ioutil"
"log"
"net/http"
"os"
"path"
gh "github.com/google/go-github/github"
"github.com/pivotal-golang/archiver/extractor"
"golang.org/x/oauth2"
)
const (
archiveTemplate = "https://%sapi.github.com/repos/%s/%s/releases/assets/%d"
)
type Github struct {
Token string
}
func (g *Github) DownloadRelease(owner, repo, name, tag string) error {
filename, err := g.downloadRelease(owner, repo, name, tag)
if err != nil {
return err
}
workdir, err := os.Getwd()
if err != nil {
return err
}
os.Rename(*filename, path.Join(workdir, name+".tar.gz"))
return nil
}
func (g *Github) downloadRelease(owner, repo, name, tag string) (*string, error) {
url, err := g.getDownloadUrl(owner, repo, name+".tar.gz", tag)
if err != nil {
return nil, err
}
filename := path.Join(os.TempDir(), name+".tar.gz")
log.Printf("downloading asset to %s\n", filename)
err = g.download(*url, filename)
if err != nil {
return nil, err
}
return &filename, nil
}
func (g *Github) DownloadAndExtractRelease(owner, repo, name, tag string) (*string, error) {
filename, err := g.downloadRelease(owner, repo, name, tag)
if err != nil {
return nil, err
}
if filename == nil {
return nil, errors.New("Filename came back nil. This is a bug.")
}
outdir := path.Join(os.TempDir(), name)
log.Println("extracting asset")
err = extractor.NewTgz().Extract(*filename, outdir)
if err != nil {
return nil, err
}
return &outdir, nil
}
func (g *Github) getDownloadUrl(owner, repo, name, tag string) (*string, error) {
client := gh.NewClient(client(g.Token))
var rel *gh.RepositoryRelease
var err error
switch tag {
case "latest":
rel, _, err = client.Repositories.GetLatestRelease(owner, repo)
default:
rel, _, err = client.Repositories.GetReleaseByTag(owner, repo, tag)
}
if err != nil {
return nil, err
}
var asset *gh.ReleaseAsset
for _, a := range rel.Assets {
if *a.Name == name {
asset = &a
break
}
}
if asset == nil {
return nil, fmt.Errorf("no asset named %s", name)
}
var token string
if len(g.Token) > 0 {
token = g.Token + "@"
} else {
token = ""
}
url := fmt.Sprintf(archiveTemplate, token, owner, repo, *asset.ID)
return &url, nil
}
func (g *Github) download(url, filename string) error {
client := http.DefaultClient
req, err := http.NewRequest("GET", url, nil)
if err != nil {
return err
}
req.Header.Add("Accept", "application/octet-stream")
resp, err := client.Do(req)
defer resp.Body.Close()
var content bytes.Buffer
content.ReadFrom(resp.Body)
err = ioutil.WriteFile(filename, content.Bytes(), os.ModePerm)
return err
}
func client(token string) *http.Client {
if len(token) == 0 {
return http.DefaultClient
}
src := oauth2.StaticTokenSource(
&oauth2.Token{
AccessToken: token,
},
)
return oauth2.NewClient(oauth2.NoContext, src)
}