If you need to auto login a user and redirect to the user's home URL or a default URL you can use this page. Save it as <MA_HOME>\overrides\web\modules\dashboards\web\autoLogin\index.html
and modify it to your needs.
Direct your web browser to <Mango URL>/user-dashboards/autoLogin
and you will be automatically logged in (if you are not already logged in.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="x-ua-compatible" content="ie=edge">
<title>Auto login</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>
<p>Logging in..</p>
<script src="/resources/require.js"></script>
<script src="/resources/loaderConfig.js"></script>
<script src="../js/loaderConfig.js"></script>
<script>
require(['angular', 'mango-3.3/maServices'], function(angular) {
const servicesInjector = angular.injector(['maServices'], true);
const User = servicesInjector.get('User');
User.current().$promise.then(null, () => {
return User.login({username: 'viewonlyuser', password: 'viewonly'}).$promise;
}).then((user) => {
window.location = user.homeUrl || '/dashboards/home';
});
});
</script>
</body>
</html>