Daniel Marín Daniel Marín - 2 months ago 27
Javascript Question

send email with gmail api not working

I am trying to send an email, by using the google api in node.js

var sendmsg = function(auth) {

var to = 'foo@gmail.com',
subject = 'Hello World',
content = 'send a Gmail.'

var email = "To: "+ to +"\r\n"+
"Subject: "+subject+"\r\n"+
content;

var base64EncodedEmail = new Buffer(email).toString('base64');
var gmail = google.gmail('v1');
var request = gmail.users.messages.send({
'userId': auth,
'message': {
'raw': base64EncodedEmail
}
}, function (err, result) {
console.log('result'+result);
});
};


I took this example from the quick start sample in google's documentation, that reads the labels in my email account(which worked fine). And I just changed the scopes to:

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'];


And created that var = email

var to = 'foo@gmail.com',
subject = 'Hello World',
content = 'send a Gmail.'

var email = "To: "+ to +"\r\n"+
"Subject: "+subject+"\r\n"+
content;


Then I am just trying to use the gmail.users.messages.send method.. But when running the result is returning the following:

<HTML>
<HEAD>
<TITLE>Bad Request</TITLE>
</HEAD>
<BODY BGCOLOR="#FFFFFF" TEXT="#000000">
<H1>Bad Request</H1>
<H2>Error 400</H2>
</BODY>
</HTML>


Any idea what I am missing? I think the way I am creating my var 'email' is wrong, but I am not sure how it should be

Answer

The value of the userId-field has to be the senders email address (or me for short), the auth-object has to be passed in the auth field, and the message should be passed in the resource-field. Your message lacks a From header and an extra new line before the content to be valid. The message also has to be base64url-encoded:

function sendMessage(auth, from, to, subject, content) {
 // The Gmail API requires url safe Base64 
 // (replace '+' with '-', and '/' with '_')
 var encodedEmail = new Buffer(
   'From: ' + from + '\r\n' +
   'To: ' + to + '\r\n' +
   'Subject: ' + subject + '\r\n\r\n' +

   content 
 ).toString('base64').replace(/\+/g, '-').replace(/\//g, '_');

 var gmail = google.gmail('v1');
 var request = gmail.users.messages.send({
   auth: auth,
   userId: 'me',
   resource: {
     raw: encodedEmail
   }
 }, function (err, result) {
   console.log('result:', result);
 });
};