Utilize Typescript/Javascript to utilize the Gmail API for sending emails via email

I am trying to send emails from my application using my Gmail account with Ionic. I have followed tutorials from SitePoint and Google Developers. Here is how I'm initializing the client:

client_id: gapiKeys.client_id,
discoveryDocs: ["https://www.googleapis.com/discovery/v1/apis/gmail/v1/rest"],
scope: [
    "https://www.googleapis.com/auth/gmail.readonly",
  // other scopes here
].join(" ")

When I only include "" in the scope, I can retrieve user labels, but including mail.google.com, modify, compose, and send gives me a 401 error. Below is my email sending code:

sendEmail() {
let top = {
  'To': '<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="23504c4e467146404a534a464d5763444e424a4f0d404c4e">[email protected]</a>',
  'Subject': 'Test'
}

var email = '';
for(var header in top) {
  email += header += ": "+ top[header] + "\r\n";
}
email += "\r\n" + "this is a testing email message.";

var request = (gapi.client as any).gmail.users.messages.send({
  'userId': 'me',
  'resource': {
    'raw': window.btoa(email).replace(/\+/g, '-').replace(/\//g, '_')
  }
});
request.execute();
}

The error response looks like this:

POST https://content.googleapis.com/gmail/v1/users/me/messages/send?alt=json&key=someKey--M 401 ()

The error details show the following:

{
 "error": {
 "errors": [
 {
  "domain": "global",
  "reason": "required",
  "message": "Login Required",
  "locationType": "header",
  "location": "Authorization"
 }
],
"code": 401,
"message": "Login Required"
}
}

How can I successfully send emails from my Ionic application without using the Gmail API's email composer?

Answer №1

We regret to inform you that your server access authorization is currently non-existent. Please conduct basic troubleshooting steps to identify the root of the issue. For more information on this matter, please refer to the following link: Kindly ensure some form of authentication is provided in the header when sending emails.

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