Gmail API for sending mails in Node.js

Question

Disclaimer:

• I have followed Google\'s own Node.js quickstart guide and successfully connect and use the gmail.users.labels.list() functionality

Answer 1

So for anyone looking at this trying to get a test email sent from their API but cant get this work heres what you gotta do:

Step 1: Replace the

var SCOPES = ['https://www.googleapis.com/auth/gmail.readonly'];

with this:

var SCOPES = [
    'https://mail.google.com/',
    'https://www.googleapis.com/auth/gmail.modify',
    'https://www.googleapis.com/auth/gmail.compose',
    'https://www.googleapis.com/auth/gmail.send'
];

Step 2: At the end of googles sample code add this:

function makeBody(to, from, subject, message) {
    var str = ["Content-Type: text/plain; charset=\"UTF-8\"\n",
        "MIME-Version: 1.0\n",
        "Content-Transfer-Encoding: 7bit\n",
        "to: ", to, "\n",
        "from: ", from, "\n",
        "subject: ", subject, "\n\n",
        message
    ].join('');

    var encodedMail = new Buffer(str).toString("base64").replace(/\+/g, '-').replace(/\//g, '_');
        return encodedMail;
}

function sendMessage(auth) {
    var raw = makeBody('Receiverofyouremail@mail.com', 'whereyouaresendingstufffrom@gmail.com', 'This is your subject', 'I got this working finally!!!');
    const gmail = google.gmail({version: 'v1', auth});
    gmail.users.messages.send({
        auth: auth,
        userId: 'me',
        resource: {
            raw: raw
        }
    
    }, function(err, response) {
        return(err || response)
    });
}

fs.readFile('credentials.json', function processClientSecrets(err, content) {
    if (err) {
        console.log('Error loading client secret file: ' + err);
        return;
    }
    // Authorize a client with the loaded credentials, then call the
    // Gmail API.
    authorize(JSON.parse(content), sendMessage);
});

Step 3(Optional)

Delete this line:

authorize(JSON.parse(content), listLabels);

And these:

/**
 * Lists the labels in the user's account.
 *
 * @param {google.auth.OAuth2} auth An authorized OAuth2 client.
 */
 function listLabels(auth) {
   const gmail = google.gmail({version: 'v1', auth});
   gmail.users.labels.list({
     userId: 'me',
   }, (err, res) => {
     if (err) return console.log('The API returned an error: ' + err);
     const labels = res.data.labels;
     if (labels.length) {
       console.log('Labels:');
       labels.forEach((label) => {
         console.log(`- ${label.name}`);
       });
     } else {
       console.log('No labels found.');
     }
   });
 }

(So you don't get the random labels in your console)

Answer 2

Ok, so I found the problem(s).

Problem #1 While following the Node.js quickstart guide the example in that tutorial has

var SCOPES = ['https://www.googleapis.com/auth/gmail.readonly'];

And when I got the .json that looks like:

{
    "access_token": "xxx_a_long_secret_string_i_hided_xxx",
    "token_type": "Bearer",
    "refresh_token": "xxx_a_token_i_hided_xxx",
    "expiry_date": 1451721044161
}

those tokens where produced taking into account only the auth/gmail.readonly scope in the tutorial code.

So I deleted the first .json, added the scopes from my final scope array (i posted in the question) and ran the tutorial setup again, receiving a new token.

Problem #2

In the object passed to the API I was sending:

{
    auth: auth,
    userId: 'me',
    message: {
        raw: raw
    }
}

but that is wrong, message key should be called resource.

---

Final setup:

This is what I added to the tutorial's code:

function makeBody(to, from, subject, message) {
    var str = ["Content-Type: text/plain; charset=\"UTF-8\"\n",
        "MIME-Version: 1.0\n",
        "Content-Transfer-Encoding: 7bit\n",
        "to: ", to, "\n",
        "from: ", from, "\n",
        "subject: ", subject, "\n\n",
        message
    ].join('');

    var encodedMail = new Buffer(str).toString("base64").replace(/\+/g, '-').replace(/\//g, '_');
        return encodedMail;
}

function sendMessage(auth) {
    var raw = makeBody('myrealemail@gmail.com', 'myrealemail@gmail.com', 'test subject', 'test message');
    gmail.users.messages.send({
        auth: auth,
        userId: 'me',
        resource: {
            raw: raw
        }
    }, function(err, response) {
        res.send(err || response)
    });
}

And call everything with:

fs.readFile(secretlocation, function processClientSecrets(err, content) {
    if (err) {
        console.log('Error loading client secret file: ' + err);
        return;
    }
    // Authorize a client with the loaded credentials, then call the
    // Gmail API.
    authorize(JSON.parse(content), sendMessage);
});