GoogleLogin.php

<?php

namespace RAP;

class GoogleLogin extends LoginHandler {

    public function __construct(Locator $locator) {
        parent::__construct($locator, Identity::GOOGLE);
    }

    public function login() {
        // Retrieve Google configuration

        $Google = $this->locator->config->authenticationMethods->Google;

        $client = new \Google_Client(array(
            'client_id' => $Google->id,
            'client_secret' => $Google->secret,
            'redirect_uri' => $this->locator->getBasePath() . $Google->callback,
        ));

        // Ask permission to obtain user email and profile information
        $client->setScopes(array(\Google_Service_People::USERINFO_EMAIL, \Google_Service_People::USERINFO_PROFILE));

        if (isset($_REQUEST['logout'])) {
            // Reset the access token stored into the session
            unset($_SESSION['access_token']);
        }

        if (isset($_GET['code'])) {
            // An access token has been returned from the auth URL.
            $client->authenticate($_GET['code']);
            $_SESSION['access_token'] = $client->getAccessToken();
        }

        if ($client->getAccessToken()) {

            // Query web service for retrieving user information
            $service = new \Google_Service_People($client);

            try {
                $res = $service->people->get('people/me', array('requestMask.includeField' => 'person.names,person.email_addresses'));
            } catch (Google_Service_Exception $e) {
                echo '<p>' . json_encode($e->getErrors()) . '</p>';
                $thisPage = $PROTOCOL . $_SERVER['HTTP_HOST'] . $_SERVER['PHP_SELF'];
                echo '<p><a href="' . $thisPage . '?logout">Click here to unset the access token</a></p>';
            }

            $name = $res->getNames()[0]->getGivenName();
            $surname = $res->getNames()[0]->getFamilyName();

            $emailAddresses = [];
            foreach ($res->getEmailAddresses() as $addr) {
                array_push($emailAddresses, $addr->value);
            }

            $typedId = explode('/', $res->getResourceName())[1];

            return $this->onIdentityDataReceived($typedId, function($identity) use($emailAddresses, $name, $surname) {
                        $identity->email = $emailAddresses[0];
                        $identity->name = $name;
                        $identity->surname = $surname;
                    });
        } else {
            // Redirect to Google authorization URL for obtaining an access token
            $authUrl = $client->createAuthUrl();
            header('Location: ' . $authUrl);
            die();
        }

        return null;
    }

}