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501 lines
14 KiB
Go
501 lines
14 KiB
Go
// This program uses the Chrome DevTools Protocol to drive a Chrome session that
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// downloads your photos stored in Google Photos.
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package main
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import (
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"context"
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"errors"
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"flag"
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"fmt"
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"io/ioutil"
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"log"
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"os"
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"os/exec"
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"path/filepath"
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"runtime"
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"strings"
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"time"
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"github.com/chromedp/cdproto/input"
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"github.com/chromedp/cdproto/page"
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"github.com/chromedp/chromedp"
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"github.com/chromedp/chromedp/kb"
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)
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var (
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nItemsFlag = flag.Int("n", -1, "number of items to download. If negative, get them all.")
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devFlag = flag.Bool("dev", false, "dev mode. we reuse the same session dir (/tmp/gphotos-cdp), so we don't have to auth at every run.")
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dlDirFlag = flag.String("dldir", "", "where to write the downloads. defaults to $HOME/Downloads/gphotos-cdp.")
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startFlag = flag.String("start", "", "skip all photos until this location is reached. for debugging.")
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runFlag = flag.String("run", "", "the program to run on each downloaded item, right after it is dowloaded. It is also the responsibility of that program to remove the downloaded item, if desired.")
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verboseFlag = flag.Bool("v", false, "be verbose")
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)
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// TODO(mpl): in general everywhere, do not rely so much on sleeps. We need
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// better ways to wait for things to be loaded/ready.
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func main() {
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flag.Parse()
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if *nItemsFlag == 0 {
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return
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}
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if !*devFlag && *startFlag != "" {
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log.Print("-start only allowed in dev mode")
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return
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}
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s, err := NewSession()
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if err != nil {
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log.Print(err)
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return
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}
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defer s.Shutdown()
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log.Printf("Session Dir: %v", s.profileDir)
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if err := s.cleanDlDir(); err != nil {
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log.Print(err)
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return
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}
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ctx, cancel := s.NewContext()
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defer cancel()
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if err := login(ctx); err != nil {
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log.Print(err)
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return
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}
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if err := chromedp.Run(ctx,
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page.SetDownloadBehavior(page.SetDownloadBehaviorBehaviorAllow).WithDownloadPath(s.dlDir),
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chromedp.Navigate("https://photos.google.com/"),
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chromedp.Sleep(5000*time.Millisecond),
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chromedp.WaitReady("body", chromedp.ByQuery),
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chromedp.ActionFunc(func(ctx context.Context) error {
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if *verboseFlag {
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log.Printf("body is ready")
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}
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return nil
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}),
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chromedp.ActionFunc(s.firstNav),
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chromedp.ActionFunc(s.navN(*nItemsFlag)),
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); err != nil {
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log.Print(err)
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return
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}
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fmt.Println("OK")
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}
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type Session struct {
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parentContext context.Context
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parentCancel context.CancelFunc
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dlDir string // dir where the photos get stored
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profileDir string // user data session dir. automatically created on chrome startup.
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// lastDone is the most recent (wrt to Google Photos timeline) item (its URL
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// really) that was downloaded. If set, it is used as a sentinel, to indicate that
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// we should skip dowloading all items older than this one.
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lastDone string
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}
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// getLastDone returns the URL of the most recent item that was downloaded in
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// the previous run. If any, it should have been stored in dlDir/.lastdone
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func getLastDone(dlDir string) (string, error) {
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data, err := ioutil.ReadFile(filepath.Join(dlDir, ".lastdone"))
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if err != nil {
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if !os.IsNotExist(err) {
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return "", err
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}
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return "", nil
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}
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return string(data), nil
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}
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func NewSession() (*Session, error) {
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var dir string
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if *devFlag {
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dir = filepath.Join(os.TempDir(), "gphotos-cdp")
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if err := os.MkdirAll(dir, 0700); err != nil {
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return nil, err
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}
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} else {
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var err error
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dir, err = ioutil.TempDir("", "gphotos-cdp")
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if err != nil {
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return nil, err
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}
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}
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dlDir := *dlDirFlag
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if dlDir == "" {
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dlDir = filepath.Join(os.Getenv("HOME"), "Downloads", "gphotos-cdp")
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}
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if err := os.MkdirAll(dlDir, 0700); err != nil {
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return nil, err
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}
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lastDone, err := getLastDone(dlDir)
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if err != nil {
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return nil, err
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}
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s := &Session{
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profileDir: dir,
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dlDir: dlDir,
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lastDone: lastDone,
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}
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return s, nil
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}
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func (s *Session) NewContext() (context.Context, context.CancelFunc) {
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ctx, cancel := chromedp.NewExecAllocator(context.Background(),
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chromedp.NoFirstRun,
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chromedp.NoDefaultBrowserCheck,
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chromedp.UserDataDir(s.profileDir),
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chromedp.Flag("disable-background-networking", true),
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chromedp.Flag("enable-features", "NetworkService,NetworkServiceInProcess"),
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chromedp.Flag("disable-background-timer-throttling", true),
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chromedp.Flag("disable-backgrounding-occluded-windows", true),
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chromedp.Flag("disable-breakpad", true),
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chromedp.Flag("disable-client-side-phishing-detection", true),
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chromedp.Flag("disable-default-apps", true),
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chromedp.Flag("disable-dev-shm-usage", true),
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chromedp.Flag("disable-extensions", true),
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chromedp.Flag("disable-features", "site-per-process,TranslateUI,BlinkGenPropertyTrees"),
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chromedp.Flag("disable-hang-monitor", true),
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chromedp.Flag("disable-ipc-flooding-protection", true),
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chromedp.Flag("disable-popup-blocking", true),
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chromedp.Flag("disable-prompt-on-repost", true),
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chromedp.Flag("disable-renderer-backgrounding", true),
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chromedp.Flag("disable-sync", true),
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chromedp.Flag("force-color-profile", "srgb"),
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chromedp.Flag("metrics-recording-only", true),
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chromedp.Flag("safebrowsing-disable-auto-update", true),
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chromedp.Flag("enable-automation", true),
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chromedp.Flag("password-store", "basic"),
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chromedp.Flag("use-mock-keychain", true),
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)
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s.parentContext = ctx
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s.parentCancel = cancel
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ctx, cancel = chromedp.NewContext(s.parentContext)
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return ctx, cancel
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}
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func (s *Session) Shutdown() {
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s.parentCancel()
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}
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// cleanDlDir removes all files (but not directories) from s.dlDir
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func (s *Session) cleanDlDir() error {
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if s.dlDir == "" {
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return nil
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}
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entries, err := ioutil.ReadDir(s.dlDir)
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if err != nil {
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return err
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}
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for _, v := range entries {
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if v.IsDir() {
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continue
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}
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if err := os.Remove(filepath.Join(s.dlDir, v.Name())); err != nil {
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return err
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}
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}
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return nil
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}
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// login navigates to https://photos.google.com/ and waits for the user to have
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// authenticated (or for 2 minutes to have elapsed).
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func login(ctx context.Context) error {
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var outerBefore string
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return chromedp.Run(ctx,
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chromedp.ActionFunc(func(ctx context.Context) error {
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if *verboseFlag {
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log.Printf("pre-navigate")
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}
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return nil
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}),
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chromedp.Navigate("https://photos.google.com/"),
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// when we're not authenticated, the URL is actually
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// https://www.google.com/photos/about/ , so we rely on that to detect when we have
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// authenticated.
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chromedp.ActionFunc(func(ctx context.Context) error {
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time.Sleep(time.Second)
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timeout := time.Now().Add(2 * time.Minute)
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var location string
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for {
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if time.Now().After(timeout) {
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return errors.New("timeout waiting for authentication")
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}
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if err := chromedp.Location(&location).Do(ctx); err != nil {
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return err
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}
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if location == "https://photos.google.com/" {
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return nil
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}
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if *verboseFlag {
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log.Printf("Not yet authenticated, at: %v", location)
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}
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time.Sleep(time.Second)
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}
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return nil
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}),
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chromedp.ActionFunc(func(ctx context.Context) error {
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if *verboseFlag {
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log.Printf("post-navigate")
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}
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return nil
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}),
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chromedp.OuterHTML("html>body", &outerBefore),
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chromedp.ActionFunc(func(ctx context.Context) error {
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if *verboseFlag {
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log.Printf("Source is %d bytes", len(outerBefore))
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}
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return nil
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}),
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)
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}
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// firstNav does either of:
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// 1) if a specific photo URL was specified with *startFlag, it navigates to it
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// 2) if the last session marked what was the most recent downloaded photo, it navigates to it
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// 3) otherwise it jumps to the end of the timeline (i.e. the oldest photo)
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func (s Session) firstNav(ctx context.Context) error {
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if *startFlag != "" {
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chromedp.Navigate(*startFlag).Do(ctx)
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chromedp.WaitReady("body", chromedp.ByQuery).Do(ctx)
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chromedp.Sleep(5000 * time.Millisecond).Do(ctx)
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return nil
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}
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if s.lastDone != "" {
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chromedp.Navigate(s.lastDone).Do(ctx)
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chromedp.WaitReady("body", chromedp.ByQuery).Do(ctx)
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chromedp.Sleep(5000 * time.Millisecond).Do(ctx)
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return nil
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}
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// For some reason, I need to do a pagedown before, for the end key to work...
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chromedp.KeyEvent(kb.PageDown).Do(ctx)
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chromedp.Sleep(500 * time.Millisecond).Do(ctx)
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chromedp.KeyEvent(kb.End).Do(ctx)
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chromedp.Sleep(5000 * time.Millisecond).Do(ctx)
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chromedp.KeyEvent(kb.ArrowRight).Do(ctx)
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chromedp.Sleep(500 * time.Millisecond).Do(ctx)
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chromedp.KeyEvent("\n").Do(ctx)
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chromedp.Sleep(time.Second).Do(ctx)
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var location, prevLocation string
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if err := chromedp.Location(&prevLocation).Do(ctx); err != nil {
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return err
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}
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for {
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chromedp.KeyEvent(kb.ArrowRight).Do(ctx)
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chromedp.Sleep(time.Second).Do(ctx)
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if err := chromedp.Location(&location).Do(ctx); err != nil {
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return err
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}
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if location == prevLocation {
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break
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}
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prevLocation = location
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}
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return nil
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}
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// doRun runs *runFlag as a command on the given filePath.
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func doRun(filePath string) error {
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if *runFlag == "" {
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return nil
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}
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if *verboseFlag {
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log.Printf("Running %v on %v", *runFlag, filePath)
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}
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cmd := exec.Command(*runFlag, filePath)
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cmd.Stdout = os.Stdout
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cmd.Stderr = os.Stderr
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return cmd.Run()
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}
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// navLeft navigates to the next item to the left
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func navLeft(ctx context.Context) error {
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chromedp.KeyEvent(kb.ArrowLeft).Do(ctx)
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chromedp.WaitReady("body", chromedp.ByQuery)
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chromedp.Sleep(1 * time.Second).Do(ctx)
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return nil
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}
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// markDone saves location in the dldir/.lastdone file, to indicate it is the
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// most recent item downloaded
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func markDone(dldir, location string) error {
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if *verboseFlag {
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log.Printf("Marking %v as done", location)
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}
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// TODO(mpl): back up .lastdone before overwriting it, in case writing it fails.
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if err := ioutil.WriteFile(filepath.Join(dldir, ".lastdone"), []byte(location), 0600); err != nil {
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return err
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}
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return nil
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}
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// startDownload sends the Shift+D event, to start the download of the currently
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// viewed item.
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func startDownload(ctx context.Context) error {
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keyD, ok := kb.Keys['D']
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if !ok {
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return errors.New("no D key")
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}
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down := input.DispatchKeyEventParams{
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Key: keyD.Key,
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Code: keyD.Code,
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NativeVirtualKeyCode: keyD.Native,
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WindowsVirtualKeyCode: keyD.Windows,
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Type: input.KeyDown,
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Modifiers: input.ModifierShift,
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}
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if runtime.GOOS == "darwin" {
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down.NativeVirtualKeyCode = 0
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}
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up := down
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up.Type = input.KeyUp
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for _, ev := range []*input.DispatchKeyEventParams{&down, &up} {
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if *verboseFlag {
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log.Printf("Event: %+v", *ev)
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}
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if err := ev.Do(ctx); err != nil {
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return err
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}
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}
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return nil
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}
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// dowload starts the download of the currently viewed item, and on successful
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// completion saves its location as the most recent item downloaded. It returns
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// with an error if the download stops making any progress for more than a minute.
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func (s Session) download(ctx context.Context, location string) (string, error) {
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if err := startDownload(ctx); err != nil {
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return "", err
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}
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var filename string
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started := false
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tick := 500 * time.Millisecond
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var fileSize int64
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deadline := time.Now().Add(time.Minute)
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for {
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time.Sleep(tick)
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if !started && time.Now().After(deadline) {
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return "", fmt.Errorf("downloading in %q took too long to start", s.dlDir)
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}
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if started && time.Now().After(deadline) {
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return "", fmt.Errorf("hit deadline while downloading in %q", s.dlDir)
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}
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entries, err := ioutil.ReadDir(s.dlDir)
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if err != nil {
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return "", err
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}
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var fileEntries []os.FileInfo
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for _, v := range entries {
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if v.IsDir() {
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continue
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}
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if v.Name() == ".lastdone" {
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continue
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}
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fileEntries = append(fileEntries, v)
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}
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if len(fileEntries) < 1 {
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continue
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}
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if len(fileEntries) > 1 {
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return "", fmt.Errorf("more than one file (%d) in download dir %q", len(fileEntries), s.dlDir)
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}
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if !started {
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if len(fileEntries) > 0 {
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started = true
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deadline = time.Now().Add(time.Minute)
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}
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}
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newFileSize := fileEntries[0].Size()
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if newFileSize > fileSize {
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// push back the timeout as long as we make progress
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deadline = time.Now().Add(time.Minute)
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fileSize = newFileSize
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}
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if !strings.HasSuffix(fileEntries[0].Name(), ".crdownload") {
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// download is over
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filename = fileEntries[0].Name()
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break
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}
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}
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if err := markDone(s.dlDir, location); err != nil {
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return "", err
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}
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return filename, nil
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}
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// moveDownload creates a directory in s.dlDir named of the item ID found in
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// location. It then moves dlFile in that directory.
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func (s Session) moveDownload(ctx context.Context, dlFile, location string) (string, error) {
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parts := strings.Split(location, "/")
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if len(parts) < 5 {
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return "", fmt.Errorf("not enough slash separated parts in location %v: %d", location, len(parts))
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}
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newDir := filepath.Join(s.dlDir, parts[4])
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if err := os.MkdirAll(newDir, 0700); err != nil {
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return "", err
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}
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newFile := filepath.Join(newDir, dlFile)
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if err := os.Rename(filepath.Join(s.dlDir, dlFile), newFile); err != nil {
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return "", err
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}
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return newFile, nil
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}
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func (s Session) dlAndMove(ctx context.Context, location string) (string, error) {
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dlFile, err := s.download(ctx, location)
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if err != nil {
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return "", err
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}
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return s.moveDownload(ctx, dlFile, location)
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}
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// navN successively downloads the currently viewed item, and navigates to the
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// next item (to the left). It repeats N times or until the last (i.e. the most
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// recent) item is reached. Set a negative N to repeat until the end is reached.
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func (s Session) navN(N int) func(context.Context) error {
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return func(ctx context.Context) error {
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n := 0
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if N == 0 {
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return nil
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}
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var location, prevLocation string
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for {
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if err := chromedp.Location(&location).Do(ctx); err != nil {
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return err
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}
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if location == prevLocation {
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break
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}
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prevLocation = location
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filePath, err := s.dlAndMove(ctx, location)
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if err != nil {
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return err
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}
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// TODO(mpl): do run in a go routine?
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if err := doRun(filePath); err != nil {
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return err
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}
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n++
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if N > 0 && n >= N {
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break
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}
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if err := navLeft(ctx); err != nil {
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return err
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}
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}
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return nil
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}
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}
|