RocketChat/Rocket.Chat

import { Accounts } from 'meteor/accounts-base';

import { IframeLogin } from '../../ui-utils/client';

const iframeLogin = new IframeLogin();

const { _unstoreLoginToken } = Accounts;
Accounts._unstoreLoginToken = function (...args) {
    iframeLogin.tryLogin();
    _unstoreLoginToken.apply(Accounts, args);
};

window.addEventListener('message', (e) => {
    if (!(typeof e.data === 'function' || (typeof e.data === 'object' && !!e.data))) {
        return;
    }

    switch (e.data.event) {
        case 'try-iframe-login':
            iframeLogin.tryLogin((error) => {
                if (error) {
                    e.source?.postMessage(
                        {
                            event: 'login-error',
                            response: error.message,
                        },
                        { targetOrigin: e.origin },
                    );
                }
            });
            break;

        case 'login-with-token':
            iframeLogin.loginWithToken(e.data, (error) => {
                if (error) {
                    e.source?.postMessage(
                        {
                            event: 'login-error',
                            response: error.message,
                        },
                        { targetOrigin: e.origin },
                    );
                }
            });
            break;
    }
});