google-oauth2-client-promisify

Redesign the Node.js code in document on google developers that describe the process for creating OAuth2 client and getting credentials. Wrap it as a tiny module and hope to be a good starting point for anyone gonna handle Google APIs in futher with promise-style.

Installation

npm install google-oauth2-client-promisify

Example - calling the Gmail API

Note:

• Make sure that client secrets (json file) was downloaded and moved into your working directory.
• npm install googleapis --save that allow you to deal with google api.

var oauth2Client = require('google-oauth2-client-promisify');
var google = require('googleapis');
var gmail = google.gmail('v1');
 
/**
* CLIENT_SECRET_FILE: Path of your client secret file.
* TOKEN_FILE: Just give a name you like for the json file which store token.
* SCOPES: Decide what kind of permission would be authorized. 
* More details in -> https://developers.google.com/gmail/api/auth/scopes
*/
 
var CLIENT_SECRET_FILE = 'client_secret_blablabla.json';
var TOKEN_FILE = 'gmail-nodejs-collect-mails.json';
var SCOPES = ['https://www.googleapis.com/auth/gmail.readonly'];
 
oauth2Client.createOauth2Client(CLIENT_SECRET_FILE,SCOPES,TOKEN_FILE)
    .then( auth => {
        gmail.users.messages.list({
                auth: auth
                ,userId: 'me'
                ,maxResults: '500'
            }, (err, response) => {
                if (err) 
                    throw err;
                else
                    console.log(response.messages);
        });
    })
    .catch( err => {
        console.log(err);
    });