Sign-in with Twitter in a Silex application.

I’ve working in a pet-project with Silex and I wanted to perform a Sign-in with Twitter. Implementing Sign in with Twitter is pretty straightforward and it’s also well explained in the Twitter’s developers site. Now we only need to implement those HTTP client requests within PHP. We can create the REST client with curl but nowadays I prefer to use the great library called Guzzle to perform those kind of opperations. So let’s start.

The idea is to create something reusable. I don’t want to spend too much time including the Sign-in with Twitter in my proyects, so my first idea was to create a class with all the needed code and mount this class as group of Silex controllers (as it’s defined here). I also want to keep the class as standard as possible and avoiding the usage of any other external dependencies (except Guzzle)..

Imagine a simple Silex application:

<?php
// www/index.php
include __DIR__ . "/../vendor/autoload.php";
 
$app = new Silex\Application();
$app->get('/', function () {
    return 'Hello';
});
 
$app->run();

Now I want to use a Sign-in with Twitter, so I will change the application to:

<?php
include __DIR__ . "/../vendor/autoload.php";
 
$app = new Silex\Application();
$app->register(new Silex\Provider\SessionServiceProvider());
 
$consumerKey    = "***";
$consumerSecret = "***";
 
$twitterLoggin = new SilexTwitterLogin($app, 'twitter');
$twitterLoggin->setConsumerKey($consumerKey);
$twitterLoggin->setConsumerSecret($consumerSecret);
$twitterLoggin->registerOnLoggin(function () use ($app, $twitterLoggin) {
    $app['session']->set($twitterLoggin->getSessionId(), [
        'user_id'            => $twitterLoggin->getUserId(),
        'screen_name'        => $twitterLoggin->getScreenName(),
        'oauth_token'        => $twitterLoggin->getOauthToken(),
        'oauth_token_secret' => $twitterLoggin->getOauthTokenSecret()
    ]);
});
 
$twitterLoggin->mountOn('/login', function () {
    return '<a href="/login/requestToken">login</a>';
});
 
$app->get('/', function () use ($app){
    return 'Hello ' . $app['session']->get('twitter')['screen_name'];
});
 
$app->run();

The application will redirects all requests (without the correct session) to the route “/login”. The login page has a simple link to the route: “/login/requestToken” (we can create a fancy template with Twig if we want, indeed). This route redirects the request to Twitter’s login page and after a successful login it will redirects back to the route that we have defined within our Twitter application. The library assumes that this callback’s url is “/login/callbackUrl”. All this default routes can be defined by the user using the proper setters of the class.

When the sign-in is finished the application will trigger the callback defined in registerOnLoggin function and will redirects to the route “/”. This route (called internally “redirectOnSuccess”) is also customizable with a setter.

And that’s all. Library available at github and packagist

{
    "require": {
        "gonzalo123/silex-twitter-login": "dev-master"
    }
}

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