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|
package github
import (
"fmt"
"io"
"net/http"
"net/url"
"os"
"path"
"path/filepath"
"regexp"
"time"
)
type Client struct {
*jsonClient
}
func NewClient() *Client {
jsonClient := newJSONClient(http.DefaultClient, "https://api.github.com")
return &Client{
jsonClient: jsonClient,
}
}
type Asset struct {
Name string `json:"name"`
BrowserDownloadURL string `json:"browser_download_url"`
}
type Release struct {
ID int `json:"id"`
TagName string `json:"tag_name"`
PublishedAt time.Time `json:"published_at"`
TarballURL string `json:"tarball_url"`
ZipballURL string `json:"zipball_url"`
Assets []Asset `json:"assets"`
}
func intRef(v int) *int {
return &v
}
func (c *Client) ListReleases(owner string, project string) ([]Release, error) {
var resp []Release
_, err := c.jsonClient.Request(http.MethodGet, intRef(http.StatusOK), path.Join("repos", owner, project, "releases"), nil, &resp)
if err != nil {
return nil, err
}
return resp, nil
}
func (c *Client) DownloadAsset(w io.Writer, owner string, project string, asset *Asset) error {
resp, err := http.Get(asset.BrowserDownloadURL)
if err != nil {
return err
}
_, err = io.Copy(w, resp.Body)
if err != nil {
return err
}
return nil
}
func (c *Client) DownloadRelease(
dirPath string,
org string,
project string,
release *Release,
) error {
for _, asset := range release.Assets {
fp := path.Join(dirPath, path.Base(asset.Name))
f, err := os.Create(fp)
if err != nil {
return err
}
defer f.Close()
resp, err := http.Get(asset.BrowserDownloadURL)
if err != nil {
return err
}
_, err = io.Copy(f, resp.Body)
if err != nil {
return err
}
}
fp := path.Join(dirPath, releaseSourceFileName(project, release.TagName, "tar.gz"))
if exist, err := isFileExist(fp); err != nil {
return fmt.Errorf("downloading tarball: %w", err)
} else if !exist {
f, err := os.Create(fp)
if err != nil {
return err
}
defer f.Close()
resp, err := http.Get(release.TarballURL)
if err != nil {
return err
}
_, err = io.Copy(f, resp.Body)
if err != nil {
return err
}
}
fp = path.Join(dirPath, releaseSourceFileName(project, release.TagName, "zip"))
if exist, err := isFileExist(fp); err != nil {
return err
} else if !exist {
f, err := os.Create(fp)
if err != nil {
return fmt.Errorf("downloading zipball: %w", err)
}
defer f.Close()
resp, err := http.Get(release.ZipballURL)
if err != nil {
return err
}
_, err = io.Copy(f, resp.Body)
if err != nil {
return err
}
}
return nil
}
func releaseDownloads(
project string,
release *Release,
) map[string]string {
files := make(map[string]string)
for _, asset := range release.Assets {
files[path.Base(asset.Name)] = asset.BrowserDownloadURL
}
fileName := releaseSourceFileName(project, release.TagName, "tar.gz")
files[fileName] = release.TarballURL
fileName = releaseSourceFileName(project, release.TagName, "zip")
files[fileName] = release.ZipballURL
return files
}
func (c *Client) download(dst string, src string) error {
resp, err := http.Head(src)
if err != nil {
return err
}
info, err := os.Stat(dst)
if !os.IsNotExist(err) && err != nil {
return err
}
if info != nil {
if info.Size() == resp.ContentLength {
return nil
}
err := os.Remove(dst)
if !os.IsNotExist(err) && err != nil {
return fmt.Errorf("could not remove '%s': %w", dst, err)
}
}
resp, err = http.Get(src)
if err != nil {
return err
}
f, err := os.Create(dst)
if err != nil {
return fmt.Errorf("creating '%s': %w", dst, err)
}
defer f.Close()
_, err = io.Copy(f, resp.Body)
if err != nil {
return err
}
return nil
}
func (c *Client) MirrorAssets(dst *url.URL, src *url.URL) error {
if src.Hostname() != "github.com" {
return fmt.Errorf("host must be github.com")
}
if dst.Scheme != "file:///" && dst.Scheme != "" {
return fmt.Errorf("unsupported destination scheme '%s'", dst.Scheme)
}
matches := regexp.MustCompilePOSIX("/(.*?)/(.*?)").FindAllStringSubmatch(src.Path, 1)
if len(matches) != 1 && len(matches[0]) != 2 {
return fmt.Errorf("must be a full path to the project")
}
owner := matches[0][1]
project := matches[0][2]
releases, err := c.ListReleases(owner, project)
if err != nil {
return fmt.Errorf("fetching list of releases: %w", err)
}
existingFiles := make(map[string]bool)
filepath.WalkDir(dst.Path, func(path string, _ os.DirEntry, err error) error {
if err != nil {
return err
}
path, err = filepath.Abs(path)
if err != nil {
return err
}
existingFiles[path] = true
return nil
})
delete(existingFiles, dst.Path)
for _, release := range releases {
localDir := localReleaseFilePath(dst, release.TagName)
localDir, err = filepath.Abs(localDir)
if err != nil {
return err
}
err := os.MkdirAll(localDir, 0777)
if err != nil {
return fmt.Errorf("creating '%s': %w", localDir, err)
}
delete(existingFiles, localDir)
for fileName, srcURL := range releaseDownloads(project, &release) {
localFile := path.Join(localDir, fileName)
delete(existingFiles, localFile)
err := c.download(localFile, srcURL)
if err != nil {
return fmt.Errorf("downloading '%s': %w", srcURL, err)
}
}
}
for fp := range existingFiles {
_ = os.RemoveAll(fp)
}
return nil
}
|
