AuthRoutes.php

<?php

namespace QuizApp\Routes;

use \Psr\Http\Message\ServerRequestInterface;
use \Psr\Http\Message\ResponseInterface;
use \Psr\Http\Message\RequestInterface;

$app->get('/login', function(ServerRequestInterface $req, ResponseInterface $resp) use ($config) {

    if(array_key_exists('HTTP_REFERER', $req->getHeaders())) 
    {
        $referer = $req->getHeader('HTTP_REFERER');
        $host = parse_url($referer[0], PHP_URL_HOST);
        $next = ($host == $config['site']['domain']) ? $referer[0] : $this->router->urlFor('index');
    }
    else 
    {
        $next = $this->router->urlFor('index');
    }

    $callback = 'http://' . $config['site']['domain'] . $this->router->pathFor('fb_callback');
    $redirect = $this->FBServices->login_url($config['facebook']['permissions'], $callback);

    $this->flash->addMessage('next_page', $next);

    return $resp->withStatus(301)->withHeader('location', $redirect);

})->setName('login')->add($is_logged_in);

/*
 * This route is used by Facebook after the user accepts or declines the application request.
 */
$app->get('/fb_callback', function(ServerRequestInterface $req, ResponseInterface $resp) {

    try {

        # Sets up the access token to make calls to graph API
        $this->FBServices->set_token();

        # Get user information
        $me = $this->FBServices->me(array('email', 'first_name', 'last_name', 'location', 'gender'));
    
    } catch(\Facebook\Exceptions\FacebookResponseException $e) { 
        $this->logger->addInofo($e->getMessage());

        return $resp->withStatus(500)
                    ->withHeader('Location', $this->router->urlFor('error'));

    } catch(\Facebook\Exceptions\FacebookSDKException $e) {
        $this->logger->addInfo($e->getMessage());

        return $resp->withStatus(500)
                    ->withHeader('Location', $this->router->urlFor('error'));

    } catch(\Exception $e) {
        $this->logger->addInfo($e->getMessage());

        return $resp->withStatus(500)
                    ->withHeader('Location', $this->router->urlFor('error'));
    }

    # Insert the user into the database.
    $user = $this->UserServices->create($me->getId(),
                                        $me->getFirstname(),
                                        $me->getLastname(),
                                        $me->getEmail(),
                                        $me->getLocation(),
                                        $me->getGender());
    
    # Create the user session, effectively, logging the user in.
    $this->SessionServices->create_user_session($user->id, $me->getId());
    
    # If flash does not include next_page paramater, redirect to homepage
    if(!$this->flash->getMessages()['next_page'])
        return $resp->withStatus(302)->withHeader('Location', '/');
    
    # Redirect to last page the user was viewing
    return $resp->withStatus(302)->withHeader('Location', $this->flash->getMessages()['next_page']);

})->setName('fb_callback');

$app->get('/logout', function(ServerRequestInterface $req, ResponseInterface $resp) {
    
    $this->SessionServices->destroy();
    return $resp->withRedirect($this->router->urlFor('index'));

})->setName('logout');