<?php ob_start();

/* Copyright © 2016 toxiicdev.net */

$clientId = "jzkbprff40iqj646a697cyrvl0zt2m6"; // Set your client key

// Curl function

function Curl($url, $header)
{
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 3);
    curl_setopt($ch, CURLOPT_TIMEOUT, 1);
    curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
    $response = curl_exec($ch);
    curl_close ($ch);
    return $response;
}

// Check for get parameter 'channel' to exist and to be valid

if (isset($_GET['channel']) && preg_match("/^[a-zA-Z0-9_]{4,25}$/u", $_GET['channel']))
{
    // Lets request to twitch tv the access token
    $response = Curl("https://api.twitch.tv/api/channels/" . $_GET['channel'] . "/access_token/",
                [
                    "Client-ID: $clientId",
                    "Host: api.twitch.tv",
                    "User-Agent: Mozilla/5.0 (Windows NT 6.3; rv:43.0) Gecko/20100101 Firefox/43.0 Seamonkey/2.40",
                    "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
                ]
            );
    
    // If the reply contains token
    if(strstr($response, "token"))
    {
        $json = json_decode($response, true); // Decode the JSON array
        header('Location: http://usher.twitch.tv/api/channel/hls/' . $_GET['channel'] . '.m3u8?player=twitchweb&token=' . rawurlencode($json['token']) . '&sig=' . $json['sig']);
    }
    else
    {
        // Print error
        echo "Couldn't get the token";
    }
}
else
{
    // Print error
    echo "Channel name not provided or invalid";
}

?>