old_contents: /**
   * Copyright 2022 Google LLC
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     https://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  // [START drive_quickstart]
  const {GoogleAuth} = require('google-auth-library');
  const {google} = require('googleapis');
  
  const auth = new GoogleAuth({scopes: 'https://www.googleapis.com/auth/drive'});
  /**
   * Lists the names and IDs of up to 10 files.
   * @param {Googleauth} auth The Google default authenticated .
   */
  function drive_quickstart(auth) {
    const drive = google.drive({version: 'v3', auth});
    drive.files.list({
      pageSize: 10,
      fields: 'nextPageToken, files(id, name)',
    }, (err, res) => {
      if (err) return console.log('The API returned an error: ' + err);
      const files = res.data.files;
      if (files.length) {
        console.log('Files:');
        files.map((file) => {
          console.log(`${file.name} (${file.id})`);
        });
      } else {
        console.log('No files found.');
      }
    });
  }
  // [END drive_quickstart]
  
  drive_quickstart(auth);
  
new_contents: /**
   * @license
   * Copyright Google Inc.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     https://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  // [START drive_quickstart]
  const fs = require('fs');
  const readline = require('readline');
  const {google} = require('googleapis');
  
  // If modifying these scopes, delete token.json.
  const SCOPES = ['https://www.googleapis.com/auth/drive.metadata.readonly'];
  // The file token.json stores the user's access and refresh tokens, and is
  // created automatically when the authorization flow completes for the first
  // time.
  const TOKEN_PATH = 'token.json';
  
  // Load client secrets from a local file.
  fs.readFile('credentials.json', (err, content) => {
    if (err) return console.log('Error loading client secret file:', err);
    // Authorize a client with credentials, then call the Google Drive API.
    authorize(JSON.parse(content), listFiles);
  });
  
  /**
   * Create an OAuth2 client with the given credentials, and then execute the
   * given callback function.
   * @param {Object} credentials The authorization client credentials.
   * @param {function} callback The callback to call with the authorized client.
   */
  function authorize(credentials, callback) {
    const {client_secret, client_id, redirect_uris} = credentials.installed;
    const oAuth2Client = new google.auth.OAuth2(
        client_id, client_secret, redirect_uris[0]);
  
    // Check if we have previously stored a token.
    fs.readFile(TOKEN_PATH, (err, token) => {
      if (err) return getAccessToken(oAuth2Client, callback);
      oAuth2Client.setCredentials(JSON.parse(token));
      callback(oAuth2Client);
    });
  }
  
  /**
   * Get and store new token after prompting for user authorization, and then
   * execute the given callback with the authorized OAuth2 client.
   * @param {google.auth.OAuth2} oAuth2Client The OAuth2 client to get token for.
   * @param {getEventsCallback} callback The callback for the authorized client.
   */
  function getAccessToken(oAuth2Client, callback) {
    const authUrl = oAuth2Client.generateAuthUrl({
      access_type: 'offline',
      scope: SCOPES,
    });
    console.log('Authorize this app by visiting this url:', authUrl);
    const rl = readline.createInterface({
      input: process.stdin,
      output: process.stdout,
    });
    rl.question('Enter the code from that page here: ', (code) => {
      rl.close();
      oAuth2Client.getToken(code, (err, token) => {
        if (err) return console.error('Error retrieving access token', err);
        oAuth2Client.setCredentials(token);
        // Store the token to disk for later program executions
        fs.writeFile(TOKEN_PATH, JSON.stringify(token), (err) => {
          if (err) return console.error(err);
          console.log('Token stored to', TOKEN_PATH);
        });
        callback(oAuth2Client);
      });
    });
  }
  
  /**
   * Lists the names and IDs of up to 10 files.
   * @param {google.auth.OAuth2} auth An authorized OAuth2 client.
   */
  function listFiles(auth) {
    const drive = google.drive({version: 'v3', auth});
    drive.files.list({
      pageSize: 10,
      fields: 'nextPageToken, files(id, name)',
    }, (err, res) => {
      if (err) return console.log('The API returned an error: ' + err);
      const files = res.data.files;
      if (files.length) {
        console.log('Files:');
        files.map((file) => {
          console.log(`${file.name} (${file.id})`);
        });
      } else {
        console.log('No files found.');
      }
    });
  }
  // [END drive_quickstart]
  
  module.exports = {
    SCOPES,
    listFiles,
  };
  
subject: Revert "Implemented default auth"