samples/oauth2.js

// Copyright 2012 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
//
//    http://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.

'use strict';

const fs = require('fs');
const path = require('path');
const http = require('http');
const url = require('url');
const opn = require('open');
const destroyer = require('server-destroy');

const {google} = require('googleapis');
const people = google.people('v1');

/**
 * To use OAuth2 authentication, we need access to a CLIENT_ID, CLIENT_SECRET, AND REDIRECT_URI.  To get these credentials for your application, visit https://console.cloud.google.com/apis/credentials.
 */
const keyPath = path.join(__dirname, 'oauth2.keys.json');
let keys = {redirect_uris: ['']};
if (fs.existsSync(keyPath)) {
  keys = require(keyPath).web;
}

/**
 * Create a new OAuth2 client with the configured keys.
 */
const oauth2Client = new google.auth.OAuth2(
  keys.client_id,
  keys.client_secret,
  keys.redirect_uris[0],
);

/**
 * This is one of the many ways you can configure googleapis to use authentication credentials. In this method, we're setting a global reference for all APIs. Any other API you use here, like `google.drive('v3')`, will now use this auth client. You can also override the auth client at the service and method call levels.
 */
google.options({auth: oauth2Client});

/**
 * Open an http server to accept the oauth callback. In this simple example, the only request to our webserver is to `/callback?code=<code>`
 */
async function authenticate(scopes) {
  return new Promise((resolve, reject) => {
    // grab the url that will be used for authorization
    const authorizeUrl = oauth2Client.generateAuthUrl({
      access_type: 'offline',
      scope: scopes.join(' '),
    });
    const server = http
      .createServer(async (req, res) => {
        try {
          if (req.url.indexOf('/oauth2callback') > -1) {
            const qs = new url.URL(req.url, 'http://localhost:3000')
              .searchParams;
            res.end('Authentication successful! Please return to the console.');
            server.destroy();
            const {tokens} = await oauth2Client.getToken(qs.get('code'));
            oauth2Client.credentials = tokens; // eslint-disable-line require-atomic-updates
            resolve(oauth2Client);
          }
        } catch (e) {
          reject(e);
        }
      })
      .listen(3000, () => {
        // open the browser to the authorize url to start the workflow
        opn(authorizeUrl, {wait: false}).then(cp => cp.unref());
      });
    destroyer(server);
  });
}

async function runSample() {
  // retrieve user profile
  const res = await people.people.get({
    resourceName: 'people/me',
    personFields: 'emailAddresses',
  });
  console.log(res.data);
}

const scopes = [
  'https://www.googleapis.com/auth/contacts.readonly',
  'https://www.googleapis.com/auth/user.emails.read',
  'profile',
];
authenticate(scopes)
  .then(client => runSample(client))
  .catch(console.error);