Login With Google

[Nagendraveer]

I developed a web app using PHP, Mysql. Now I want to give login access for Gmail id's which are already existed in my database, so I used login with Google API, but want to deny login access for any other gmails which do not exist in my database.?  So how can i do this?? currently iam using Google+ API For Login With Google & it is giving login access to everyone.

 

Edited September 11, 2019 by cyberRobot
Removed image

[NotionCommotion]

I don't know how Google's login API works, but couldn't you just add the following logic to the entry point to your app?

<?php
if(empty($_SESSION['auth'])) {
  $email=$_POST['email'];	//or whatever
  //query DB.  If email doesn't exist, exit.  If email exists, set $_SESSION['auth']
}