URL expand

composer.json

{
    "require": {
        "predis/predis": "~1"
    }
}

composer.lock

{
    "_readme": [
        "This file locks the dependencies of your project to a known state",
        "Read more about it at http://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
        "This file is @generated automatically"
    ],
    "hash": "8b51fc183ca7b77379ac47fcf29dfa95",
    "packages": [
        {
            "name": "predis/predis",
            "version": "v1.0.1",
            "source": {
                "type": "git",
                "url": "https://github.com/nrk/predis.git",
                "reference": "7a170b3d8123c556597b4fbdb88631f99de180c2"
            },
            "dist": {
                "type": "zip",
                "url": "https://api.github.com/repos/nrk/predis/zipball/7a170b3d8123c556597b4fbdb88631f99de180c2",
                "reference": "7a170b3d8123c556597b4fbdb88631f99de180c2",
                "shasum": ""
            },
            "require": {
                "php": ">=5.3.2"
            },
            "require-dev": {
                "phpunit/phpunit": "~4.0"
            },
            "suggest": {
                "ext-curl": "Allows access to Webdis when paired with phpiredis",
                "ext-phpiredis": "Allows faster serialization and deserialization of the Redis protocol"
            },
            "type": "library",
            "autoload": {
                "psr-4": {
                    "Predis\\": "src/"
                }
            },
            "notification-url": "https://packagist.org/downloads/",
            "license": [
                "MIT"
            ],
            "authors": [
                {
                    "name": "Daniele Alessandri",
                    "email": "suppakilla@gmail.com",
                    "homepage": "http://clorophilla.net"
                }
            ],
            "description": "Flexible and feature-complete PHP client library for Redis",
            "homepage": "http://github.com/nrk/predis",
            "keywords": [
                "nosql",
                "predis",
                "redis"
            ],
            "time": "2015-01-02 12:51:34"
        }
    ],
    "packages-dev": [],
    "aliases": [],
    "minimum-stability": "stable",
    "stability-flags": [],
    "prefer-stable": false,
    "prefer-lowest": false,
    "platform": [],
    "platform-dev": []
}

index.php

<?php

require_once __DIR__.'/vendor/autoload.php';

/**
 * @see http://php.net/manual/fr/function.parse-url.php#106731
 */
function unparse_url($parsed_url, $with_fragment = false) 
{
    $scheme   = isset($parsed_url['scheme']) ? $parsed_url['scheme'] . '://' : '';
    $host     = isset($parsed_url['host']) ? $parsed_url['host'] : '';
    $port     = isset($parsed_url['port']) ? ':' . $parsed_url['port'] : '';
    $user     = isset($parsed_url['user']) ? $parsed_url['user'] : '';
    $pass     = isset($parsed_url['pass']) ? ':' . $parsed_url['pass']  : '';
    $pass     = ($user || $pass) ? "$pass@" : '';
    $path     = isset($parsed_url['path']) ? $parsed_url['path'] : '';
    $query    = isset($parsed_url['query']) ? '?' . $parsed_url['query'] : '';
    $fragment = $with_fragment && isset($parsed_url['fragment']) ? '#' . $parsed_url['fragment'] : '';
    return "$scheme$user$pass$host$port$path$query$fragment";
} 

function getRedirection($url)
{
    $ch = curl_init();
    
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_HEADER, true);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, false);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_USERAGENT, 'Expand Short URL | Simon Leblanc');

    $data = curl_exec($ch);
    $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    $redirection = curl_getinfo($ch, CURLINFO_REDIRECT_URL);
    curl_close($ch);

    if ($http_code !== 301 && $http_code !== 302) {
        return false;
    }

    return $redirection;
}

function getFromRedis(Predis\Client $predis, $url)
{
    return $predis->get($url);
}

function saveInRedis(Predis\Client $predis, $url, $redirection)
{
    if (null === $redirection || false === $redirection) {
        return;
    }

    $predis->set($url, $redirection);
}

$url = null;
$redirection = null;
$error = null;

if (isset($_GET['url']) === true && empty($_GET['url']) === false) {
    $datas = parse_url($_GET['url']);

    if (false === $datas) {
        $error = 'Bad URL !';
    } else {
        if (isset($datas['scheme']) === false || empty($datas['scheme']) === true) {
            $datas['scheme'] = 'http';
        }

        if ('http' !== $datas['scheme'] && 'https' !== $datas['scheme']) {
            $error = 'HTTP Url only !';
        } else {
            $predis = new Predis\Client(null, ['prefix' => 'expand-url:']);

            $url = unparse_url($datas);
            if (null === ($redirection = getFromRedis($predis, $url))) {
                $redirection = getRedirection($url);
                saveInRedis($predis, $url, $redirection);
            }
        }
    }
}
?><!DOCTYPE html>
<html lang="fr">
    <head>
        <meta charset="utf-8" />
        <title>Expand URL</title>
        <link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css">
        <style type="text/css">
        label{display:none}
        .form-inline .form-control{width:100%}
        .form-group.col-md-11,.form-group.col-xs-10{padding-left:0}
        pre{display:inline-block;width:calc(100% - 50px);margin-right:8px}
        a{display:inline-block;float:right;margin-top:3px;}
        </style>
    </head>
    <body>
        <div class="container-fluid">
            <div class="row">
                <div class="col-md-12">
                    <h1>Expand<?php if (null !== $url) { echo ' : '.htmlentities($url, ENT_HTML5, 'UTF-8'); } ?></h1>
                </div>
            </div>
            <?php if (null !== $error) { ?>
            <div class="row">
                <div class="col-md-12">
                    <div class="alert alert-danger"><?php echo htmlentities($error, ENT_HTML5, 'UTF-8') ?></div>
                </div>
            </div>
            <?php } ?>
            <div class="row">
                <div class="col-md-12">
                    <?php if (null === $url) { ?>
                    <form action="" method="get" role="form" class="form-inline">
                        <div class="form-group col-md-11 col-xs-10">
                            <label for="url">URL</label>
                            <input type="text" name="url" id="url" class="form-control" autofocus placeholder="Enter url to expand">
                        </div>
                        <button type="submit" class="btn btn-success">
                            <i class="glyphicon glyphicon-search"></i>
                        </button>
                    </form>
                    <?php } elseif (false === $redirection) { ?>
                    <pre>Aucune redirection disponible</pre>
                    <?php } elseif (null !== $redirection) { ?>
                    <pre><?php echo htmlentities($redirection, ENT_HTML5, 'UTF-8') ?></pre>
                    <a href="<?php echo $_SERVER['PHP_SELF'].'?url='.urlencode($redirection) ?>" class="btn btn-success">
                            <i class="glyphicon glyphicon-search"></i></a>
                    <?php } else { ?>
                    <div class="alert alert-warning">Maybe, no result...</div>
                    <?php } ?>
                </div>
            </div>
        </div>
    </body>
</html>