google-oauth-serviceaccount

oauth module to retrive an access token with google service account

npm install google-oauth-serviceaccount
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google-oauth-serviceaccount

Motivation:

Wanted to accesss my personal calendar, NOT the one of Google Apps, and found no good example for node.js with service account without any interaction.

Install:

npm install google-oauth-serviceaccount

Preparation:

  1. Create your service account and enable calendar access(thanks to this post):
    >    a) Log in into the Google account you want to use to manage your projects.
    >    b) Go to https://code.google.com/apis/console/
    >    c) Create a project. You will get issued a project number, in our example
    >    we'll use 99999999999.
    >    d) Allow the project to use the calendar API:
    >    -> services (left pane), then find 'calendar api' and set the button 'on'
    >    e) Create a Service Account.
    >    -> API access (left pane); select 'create service account'
    >    Part of the procedure is that you'll get a PKCS#12 bundle, which you can
    >    download and should store on your appserver in a secure location. Your
    >    app should be able to access it, but outsiders should not be allowed to
    >    download it.
    
  2. Store the p12 file into pem with openssl(thank this)

    $ openssl pkcs12 -in yourkey.p12 -out yourkey.pem -nodes
    type "notasecret" for password.

  3. Share the calendar with your developer account

    Calendar "Settings" -> "Share this calendar", at "Share with specific people", put the email address of developer account choosing a permission you want, then "add person". The address should be like "yourProjectId@developer.gserviceaccount.com".

  4. Edit oahtu-config.json and place key.pem which generated in step 2.

    {
     "keyFile": "key.pem"
    ,"expiresInMinuteas": 60
    ,"claim":{
         "iss":"yourProjectID@developer.gserviceaccount.com"
        ,"scope":"https://www.googleapis.com/auth/calendar"
        ,"aud":"https://accounts.google.com/o/oauth2/token"
     }
    }
    
  5. Test with test.js.

    if successfull, you'll see an access token:

    token:ya29.AHES6ZSfxRWLEv9vfusipvawSS-55oQyMAGxF3kbRGsgGMTo
  6. Enjoy with calendar APIs. You may try listEvents.js.

Usage example:

const request = require('request');
const gaccount = require('./google-oauth-serviceaccount');

const calRoot = "https://www.googleapis.com/calendar/v3";

gaccount.auth(function(err, access_token){

    var token = "?access_token="+access_token;

    request.get({
        url:calRoot+"/users/me/calendarList"+token,
        json:true
        }, function(err, res, body){

            for(var c=0; c<body.items.length; c++){
                console.log(body.items[c]);

                request.get({
                    url:calRoot+"/calendars/"+body.items[c].id+"/events"+token,
                    json:true
                    }, function(err, res, cal){
                        console.log(cal);
                });
            }
    })

});
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