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googleDrive.go
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googleDrive.go
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package uploaders
// Following this: https://developers.google.com/identity/gsi/web/guides/devices
import (
"bytes"
"context"
"encoding/base64"
"encoding/json"
"errors"
"fmt"
"io"
"io/fs"
"math"
"net/http"
"net/url"
"os"
"os/user"
"strings"
"sync"
"time"
"github.com/itsvyle/gh-backup/config"
log "github.com/sirupsen/logrus"
"golang.org/x/oauth2"
"google.golang.org/api/drive/v3"
"google.golang.org/api/option"
)
type UploaderGoogleDrive struct {
name string
enabled bool
credentialsFile string
driveService *drive.Service
projectRootFolderID string
currentBackupFolder string
previousInfoFileID string
clientID string
clientSecret string
zipRepos bool
}
func NewUploaderGoogleDrive(settings *config.BackupMethod) *UploaderGoogleDrive {
if settings.Name == "" {
log.Fatal("Name not set for Google Drive uploader")
}
u := &UploaderGoogleDrive{
name: settings.Name,
enabled: settings.Enabled,
zipRepos: true,
currentBackupFolder: "ABABAA",
}
{
usr, err := user.Current()
if err != nil {
log.WithError(err).Fatal("failed to get current user")
}
u.credentialsFile = fmt.Sprintf("%s/.ghbackup/credentials_%s.json", usr.HomeDir, sanitizeName(settings.Name))
err = os.MkdirAll(fmt.Sprintf("%s/.ghbackup", usr.HomeDir), os.ModePerm)
if err != nil {
log.WithError(err).Fatal("failed to create directory")
}
}
if settings.Parameters == nil {
settings.Parameters = make(map[string]string)
}
if settings.Parameters["clientID"] == "" {
log.WithField("name", settings.Name).Error("clientID param not set; please add it to the config file after following instructions on https://developers.google.com/identity/gsi/web/guides/devices")
u.enabled = false
} else {
u.clientID = settings.Parameters["clientID"]
}
if settings.Parameters["clientSecret"] == "" {
log.WithField("name", settings.Name).Error("clientSecret param not set; please add it to the config file after following instructions on https://developers.google.com/identity/gsi/web/guides/devices.")
u.enabled = false
} else {
u.clientSecret = settings.Parameters["clientSecret"]
}
if settings.Parameters["zipRepos"] == "false" {
u.zipRepos = false
log.WithField("name", settings.Name).Fatal("gdrive uploader does not yet support unzipped repos")
}
return u
}
func (u *UploaderGoogleDrive) Type() string {
return "google-drive"
}
func (u *UploaderGoogleDrive) Name() string {
return u.name
}
func (u *UploaderGoogleDrive) Enabled() bool {
return u.enabled
}
func (u *UploaderGoogleDrive) Connect() error {
_, err := os.Stat(u.credentialsFile)
exists := !errors.Is(err, fs.ErrNotExist)
if err != nil && exists {
return fmt.Errorf("credentials file not found: %w", err)
}
var idToken GoogleTokenResponse
if exists {
log.WithField("name", u.name).Infof("credentials file exists at %s", u.credentialsFile)
tokenBytes, err := os.ReadFile(u.credentialsFile)
if err != nil {
return fmt.Errorf("failed to read token file: %w", err)
}
err = json.Unmarshal(tokenBytes, &idToken)
if err != nil {
return fmt.Errorf("failed to unmarshal token file: %w", err)
}
if idToken.AccessToken == "" {
return errors.New("access token not found in token file")
}
} else {
idToken, err = u.authenticate()
if err != nil {
return err
}
}
if idToken.RefreshedAt.Add(time.Duration(idToken.ExpiresIn) * time.Second).Before(time.Now()) {
log.WithField("name", u.name).Info("Token expired, refreshing")
idToken, err = u.refreshToken(idToken)
if err != nil {
relogin := config.GetYesNoInput("Failed to refresh token, would you like to re-authenticate?")
if relogin {
idToken, err = u.authenticate()
if err != nil {
return err
}
} else {
return err
}
}
}
// Create a new drive service
ctx := context.Background()
u.driveService, err = drive.NewService(ctx, option.WithTokenSource(oauth2.StaticTokenSource(&oauth2.Token{
AccessToken: idToken.AccessToken,
})))
if err != nil {
return fmt.Errorf("failed to create drive service: %w", err)
}
folderReq := u.driveService.Files.List()
folderReq.Q("mimeType='application/vnd.google-apps.folder' and name='gh-backup'")
folder, err := folderReq.Do()
if err != nil {
return fmt.Errorf("failed to list folders: %w", err)
}
if len(folder.Files) == 0 || folder.Files[0].Trashed {
log.WithField("name", u.name).Info("Root gh-backup folder not found, creating")
newFolder, err := u.driveService.Files.Create(&drive.File{
Name: "gh-backup",
MimeType: "application/vnd.google-apps.folder",
Parents: []string{"root"},
}).Do()
if err != nil {
return fmt.Errorf("failed to create folder: %w", err)
}
u.projectRootFolderID = newFolder.Id
} else {
u.projectRootFolderID = folder.Files[0].Id
}
return nil
}
type GoogleDriveDeviceCodeResponse struct {
DeviceCode string `json:"device_code"`
UserCode string `json:"user_code"`
VerificationURL string `json:"verification_url"`
ExpiresIn int `json:"expires_in"`
Interval int `json:"interval"`
}
type GoogleTokenResponse struct {
Error string `json:"error"`
AccessToken string `json:"access_token"`
TokenType string `json:"token_type"`
ExpiresIn int `json:"expires_in"`
RefreshToken string `json:"refresh_token"`
IDToken string `json:"id_token"`
// Not part of the response
RefreshedAt time.Time `json:"obtained_at"`
}
func (u *UploaderGoogleDrive) authenticate() (GoogleTokenResponse, error) {
log.Infof("%s: Authenticating with Google Drive, as the credentials file was not found.", u.name)
requestBody := fmt.Sprintf("client_id=%s&scope=%s", url.QueryEscape(u.clientID), url.QueryEscape("email https://www.googleapis.com/auth/drive.file"))
req, err := http.NewRequest(http.MethodPost, "https://oauth2.googleapis.com/device/code", bytes.NewBufferString(requestBody))
if err != nil {
log.WithField("name", u.name).WithError(err).Error("failed to create request")
return GoogleTokenResponse{}, fmt.Errorf("failed to create request: %w", err)
}
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
client := &http.Client{}
resp, err := client.Do(req)
if err != nil {
log.WithField("name", u.name).WithError(err).Error("failed to send request")
return GoogleTokenResponse{}, fmt.Errorf("failed to send request: %w", err)
}
defer resp.Body.Close()
body, err := io.ReadAll(resp.Body)
if err != nil {
log.WithField("name", u.name).WithError(err).Error("failed to read response body")
return GoogleTokenResponse{}, fmt.Errorf("failed to read response body: %w", err)
}
if resp.StatusCode != http.StatusOK {
log.WithField("name", u.name).WithField("status", resp.StatusCode).WithField("body", string(body)).Error("failed to authenticate")
return GoogleTokenResponse{}, fmt.Errorf("failed to authenticate: %d", resp.StatusCode)
}
var deviceCodeResponse GoogleDriveDeviceCodeResponse
err = json.Unmarshal(body, &deviceCodeResponse)
if err != nil {
log.WithField("name", u.name).WithError(err).Error("failed to unmarshal response")
return GoogleTokenResponse{}, fmt.Errorf("failed to unmarshal response: %w", err)
}
log.Infof("Please visit %s and enter the code: %s", deviceCodeResponse.VerificationURL, deviceCodeResponse.UserCode)
tokenResponse, err := u.pollTokenAPI(deviceCodeResponse)
if err != nil {
return GoogleTokenResponse{}, err
}
log.WithField("token", tokenResponse).Info("Authenticated successfully")
tokenResponse.RefreshedAt = time.Now()
// Save the contents to the file
err = u.saveTokenDataToFile(tokenResponse)
if err != nil {
return GoogleTokenResponse{}, err
}
email, err := u.getEmailFromIDToken(tokenResponse.IDToken)
if err != nil {
log.WithField("name", u.name).WithError(err).Error("failed to get email from token")
return GoogleTokenResponse{}, fmt.Errorf("failed to get email from token: %w", err)
}
log.Infof("Authenticated as %s", email)
return tokenResponse, nil
}
const googleDriveTokenTimeToAnswer = 600 // 10 minutes
func (u *UploaderGoogleDrive) pollTokenAPI(deviceCodeResponse GoogleDriveDeviceCodeResponse) (responseToken GoogleTokenResponse, err error) {
requestBody := fmt.Sprintf(
"client_id=%s&client_secret=%s&code=%s&grant_type=http://oauth.net/grant_type/device/1.0",
url.QueryEscape(u.clientID),
url.QueryEscape(u.clientSecret),
url.QueryEscape(deviceCodeResponse.DeviceCode),
)
req, err := http.NewRequest(http.MethodPost, "https://oauth2.googleapis.com/token", bytes.NewBufferString(requestBody))
if err != nil {
log.WithField("name", u.name).WithError(err).Error("failed to create request token")
err = fmt.Errorf("failed to create request: %w", err)
return
}
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
maxExpiration := float64(math.Max(float64(deviceCodeResponse.ExpiresIn), googleDriveTokenTimeToAnswer))
totalChecks := int(math.Floor(maxExpiration / float64(deviceCodeResponse.Interval)))
client := &http.Client{}
for i := 0; i < totalChecks; i++ {
req.Body = io.NopCloser(bytes.NewBufferString(requestBody))
time.Sleep(time.Duration(deviceCodeResponse.Interval) * time.Second)
resp, err := client.Do(req)
if err != nil {
log.WithField("name", u.name).WithError(err).Error("failed to send request token")
err = fmt.Errorf("failed to send request: %w", err)
return responseToken, err
}
defer resp.Body.Close()
if resp.StatusCode == http.StatusPreconditionRequired {
continue
}
if resp.StatusCode != http.StatusOK {
body, _ := io.ReadAll(resp.Body)
log.WithField("name", u.name).WithField("status", resp.StatusCode).WithField("body", string(body)).Error("failed to poll for token")
return responseToken, fmt.Errorf("failed to poll for token: %d", resp.StatusCode)
}
body, err := io.ReadAll(resp.Body)
if err != nil {
log.WithField("name", u.name).WithError(err).Error("failed to read token response body")
return responseToken, fmt.Errorf("failed to read token response body: %w", err)
}
err = json.Unmarshal(body, &responseToken)
if err != nil {
log.WithField("name", u.name).WithError(err).Error("failed to unmarshal token response")
return GoogleTokenResponse{}, fmt.Errorf("failed to unmarshal token response: %w", err)
}
return responseToken, nil
}
return
}
func (u *UploaderGoogleDrive) refreshToken(tokenData GoogleTokenResponse) (GoogleTokenResponse, error) {
log.Infof("%s: Obtaining new google drive access token.", u.name)
requestBody := fmt.Sprintf(
"client_id=%s&client_secret=%s&refresh_token=%s&grant_type=refresh_token",
url.QueryEscape(u.clientID),
url.QueryEscape(u.clientSecret),
url.QueryEscape(tokenData.RefreshToken),
)
req, err := http.NewRequest(http.MethodPost, "https://oauth2.googleapis.com/token", bytes.NewBufferString(requestBody))
if err != nil {
log.WithField("name", u.name).WithError(err).Error("failed to create request to refresh token")
return GoogleTokenResponse{}, fmt.Errorf("failed to create request: %w", err)
}
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
client := &http.Client{}
resp, err := client.Do(req)
if err != nil {
log.WithField("name", u.name).WithError(err).Error("failed to send request to refresh token")
return GoogleTokenResponse{}, fmt.Errorf("failed to send request: %w", err)
}
defer resp.Body.Close()
body, err := io.ReadAll(resp.Body)
if err != nil {
log.WithField("name", u.name).WithError(err).Error("failed to read response body to refresh token")
return GoogleTokenResponse{}, fmt.Errorf("failed to read response body: %w", err)
}
if resp.StatusCode != http.StatusOK {
log.WithField("name", u.name).WithField("status", resp.StatusCode).WithField("body", string(body)).Error("failed to authenticate")
return GoogleTokenResponse{}, fmt.Errorf("failed to authenticate: %d", resp.StatusCode)
}
var newTokenData GoogleTokenResponse
err = json.Unmarshal(body, &newTokenData)
if err != nil {
log.WithField("name", u.name).WithError(err).Error("failed to unmarshal response to refresh token")
return GoogleTokenResponse{}, errors.New("failed to unmarshal response")
}
newTokenData.RefreshToken = tokenData.RefreshToken
newTokenData.RefreshedAt = time.Now()
err = u.saveTokenDataToFile(newTokenData)
if err != nil {
return GoogleTokenResponse{}, fmt.Errorf("failed to save token data to file: %w", err)
}
return newTokenData, nil
}
func (u *UploaderGoogleDrive) saveTokenDataToFile(tokenData GoogleTokenResponse) error {
tokenBytes, err := json.Marshal(tokenData)
if err != nil {
log.WithField("name", u.name).WithError(err).Error("failed to marshal token data")
return fmt.Errorf("failed to marshal token data: %w", err)
}
err = os.WriteFile(u.credentialsFile, tokenBytes, 0644)
if err != nil {
log.WithField("name", u.name).WithError(err).Error("failed to save token data to file")
return fmt.Errorf("failed to write token data to file: %w", err)
}
return nil
}
func (u *UploaderGoogleDrive) GetPreviousBackupTimes() (res map[string]time.Time, err error) {
filesReq := u.driveService.Files.List()
filesReq.Q("mimeType='application/json' and name='GLOBAL_" + config.BackupInfoFile + "'")
files, err := filesReq.Do()
if err != nil {
return nil, fmt.Errorf("failed to list files: %w", err)
}
if len(files.Files) == 0 {
return nil, nil
}
fileID := files.Files[0].Id
u.previousInfoFileID = fileID
file, err := u.driveService.Files.Get(fileID).Download()
if err != nil {
return nil, fmt.Errorf("failed to download file: %w", err)
}
defer file.Body.Close()
fileBytes, err := io.ReadAll(file.Body)
if err != nil {
return nil, fmt.Errorf("failed to read file: %w", err)
}
err = json.Unmarshal(fileBytes, &res)
if err != nil {
return nil, fmt.Errorf("failed to unmarshal file: %w", err)
}
return
}
type GoogleIDToken struct {
Email string `json:"email"`
}
func (u *UploaderGoogleDrive) getEmailFromIDToken(tokenData string) (email string, err error) {
parts := strings.Split(tokenData, ".")
if len(parts) != 3 { //nolint:mnd
return "", errors.New("invalid token format")
}
jwtPayload := parts[1]
decoded, err := base64.RawURLEncoding.DecodeString(jwtPayload)
if err != nil {
return "", fmt.Errorf("failed to decode token payload: %w", err)
}
var token GoogleIDToken
err = json.Unmarshal(decoded, &token)
if err != nil {
return "", fmt.Errorf("failed to unmarshal token: %w", err)
}
if token.Email == "" {
return "", errors.New("email not found in token")
}
return token.Email, nil
}
func (u *UploaderGoogleDrive) Push(changedRepos []string, infoFile map[string]time.Time) (err error) {
if len(changedRepos) == 0 {
log.WithField("name", u.name).Info("No repos to upload, up to date")
return
}
// create new folder for this backup
folderName := "gh-backup-" + time.Now().Format("2006-01-02-15-04-05")
newFolder, err := u.driveService.Files.Create(&drive.File{
Name: folderName,
Parents: []string{u.projectRootFolderID},
MimeType: "application/vnd.google-apps.folder",
}).Do()
if err != nil {
return fmt.Errorf("failed to create folder: %w", err)
}
u.currentBackupFolder = newFolder.Id
wg := sync.WaitGroup{}
wg.Add(len(changedRepos))
runningCopies := make(chan struct{}, config.ConcurrentRepoDownloads)
for _, repo := range changedRepos {
runningCopies <- struct{}{}
go func(r string) {
defer func() {
<-runningCopies
wg.Done()
}()
err = u.pushRepo(r)
if err != nil {
log.WithField("name", u.name).WithField("repo", r).WithError(err).Error("failed to copy repo")
}
}(repo)
}
wg.Wait()
// Save last updated time for all repos in a file
// reposUpdatedBytes, err := json.Marshal(infoFile)
if err != nil {
return fmt.Errorf("failed to marshal updated repos: %w", err)
}
infoFileBytes, err := json.Marshal(infoFile)
if err != nil {
return fmt.Errorf("failed to marshal updated repos: %w", err)
}
if u.previousInfoFileID != "" {
err = u.driveService.Files.Delete(u.previousInfoFileID).Do()
if err != nil {
log.WithField("name", u.name).WithError(err).Error("failed to delete previous info file")
return fmt.Errorf("failed to delete previous info file: %w", err)
}
}
_, err = u.driveService.Files.Create(&drive.File{
Name: "GLOBAL_" + config.BackupInfoFile,
Parents: []string{u.projectRootFolderID},
MimeType: "application/json",
}).Media(bytes.NewReader(infoFileBytes)).Do()
if err != nil {
log.WithField("name", u.name).WithError(err).Error("failed to create file")
return fmt.Errorf("failed to create file: %w", err)
}
return
}
func (u *UploaderGoogleDrive) pushRepo(repo string) error {
sourcePath := config.LocalStoragePath + "/" + config.SanitizeRepoName(repo)
_, err := os.Stat(sourcePath)
if err != nil {
return fmt.Errorf("'%s' failed to check repo source path path: %w", repo, err)
}
if !u.zipRepos {
panic("non-zipped repos not supported yet")
}
zipPath, err := GetZipPath(repo)
if err != nil {
return fmt.Errorf("'%s' failed to get zip path: %w", repo, err)
}
// Create a new file on Google Drive
file, err := os.Open(zipPath)
if err != nil {
return fmt.Errorf("'%s' failed to open zip file: %w", repo, err)
}
defer file.Close()
// Create a new file on Google Drive
f := &drive.File{
Name: config.SanitizeRepoName(repo) + ".zip",
Parents: []string{u.currentBackupFolder},
}
_, err = u.driveService.Files.Create(f).Media(file).Do()
if err != nil {
log.WithField("name", u.name).WithField("repo", repo).WithError(err).Error("failed to create file")
return fmt.Errorf("'%s' failed to create file: %w", repo, err)
}
log.WithField("name", u.name).Infof("uploaded %s", repo)
return nil
}