blob: 744e5d4951856b5ac8eef924cf489c93944084a4 [file] [log] [blame]
// Copyright 2020 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
package drivefs
import (
drive ""
// APIClient contains the stored client and Drive API service.
type APIClient struct {
Service *drive.Service
// CreateAPIClient is a factory method that authorizes the logged in user.
// The factory returns a APIClient type that has helper methods to perform Drive API tasks.
func CreateAPIClient(ctx context.Context, cr *chrome.Chrome, oauthCredentials string) (*APIClient, error) {
config, err := google.ConfigFromJSON([]byte(oauthCredentials), drive.DriveFileScope)
if err != nil {
return nil, errors.Wrap(err, "failed parsing supplied oauth credentials")
// Create a channel that we can push the auth code into from the local server instance.
authCodeChan := make(chan string)
state := fmt.Sprintf("st%d", time.Now().UnixNano())
// Sets up a local server instance to handle the oauth redirect flow.
handler := serveAuthCodeRoute(ctx, state, authCodeChan)
ts := httptest.NewServer(http.HandlerFunc(handler))
defer ts.Close()
// Generate the oauth consent URL.
config.RedirectURL = ts.URL
authURL := config.AuthCodeURL(state)
// Start a renderer and navigate to the oauth consent URL.
conn, err := cr.NewConn(ctx, authURL)
if err != nil {
return nil, errors.Wrapf(err, "failed to navigate to auth url: %s", authURL)
defer conn.Close()
defer conn.CloseTarget(ctx)
// Wait for the profile element on oauth consent screen and click current user.
if err := waitAndClickElement(ctx, conn, "document.querySelector('div[data-authuser=\"0\"]')"); err != nil {
return nil, err
// Next will either be an oauth scope allow dialog or a checkbox, so wait for either of them and allow it.
oauthScopeDialogAllow := "div[data-custom-id=\"oauthScopeDialog-allow\"]"
oauthScopeCheckbox := "div[data-value=\"\"]"
oauthScopeSelector := fmt.Sprintf("document.querySelector('%s, %s')", oauthScopeDialogAllow, oauthScopeCheckbox)
if err := waitAndClickElement(ctx, conn, oauthScopeSelector); err != nil {
return nil, err
// Wait for the oauth approval screen to show then click the final Allow.
if err := waitAndClickElement(ctx, conn, "document.querySelector('div[id=\"submit_approve_access\"]')"); err != nil {
return nil, err
authCode := <-authCodeChan
// Exchange the supplied oauth credentials and auth code for oauth token.
token, err := config.Exchange(ctx, authCode)
if err != nil {
return nil, errors.Wrap(err, "failed to exchange the auth code")
// Generate a *http.Client from the retrieved oauth token.
client := config.Client(ctx, token)
// Generate the drive service with the supplied oauth client.
service, err := drive.New(client)
if err != nil {
return nil, errors.Wrap(err, "failed to initialise the drive client")
return &APIClient{
Service: service,
}, nil
// serveAuthCodeRoute returns a http.Handler like function with state and auth code channel closed over.
func serveAuthCodeRoute(ctx context.Context, state string, authCodeChan chan string) func(rw http.ResponseWriter, req *http.Request) {
return func(rw http.ResponseWriter, req *http.Request) {
if code := req.FormValue("code"); code != "" && req.FormValue("state") == state {
authCodeChan <- code
http.Error(rw, "", 500)
// waitAndClickElement simply waits until the element exists on the page.
// Once it exists it clicks the element supplied, the supplied element
// must be a singleton, this does not handle multiple elements.
func waitAndClickElement(ctx context.Context, conn *chrome.Conn, jsExpr string) error {
if err := conn.WaitForExprFailOnErrWithTimeout(ctx, fmt.Sprintf("%s != null", jsExpr), time.Minute); err != nil {
return errors.Wrapf(err, "failed waiting for html element selector to be non-null: %s", jsExpr)
if err := conn.Eval(ctx, fmt.Sprintf("", jsExpr), nil); err != nil {
return errors.Wrapf(err, "failed to click the html element selector: %s", jsExpr)
return nil
// CreateBlankGoogleDoc creates a google doc with supplied filename in the directory path.
// All paths should start with root unless they are team drives, in which case the drive path.
func (d *APIClient) CreateBlankGoogleDoc(ctx context.Context, fileName string, dirPath []string) (*drive.File, error) {
doc := &drive.File{
MimeType: "application/",
Name: fileName,
Parents: dirPath,
return d.Service.Files.Create(doc).Do()
// RemoveFileByID removes the file by supplied fileID.
func (d *APIClient) RemoveFileByID(ctx context.Context, fileID string) error {
return d.Service.Files.Delete(fileID).Do()