Parse Steamgifts.com to automatically have a chance to win Steam games based on a games list.

sg.sh

#!/bin/sh

while true
do
    /usr/bin/php SteamGiftsScript.php &

    printf "\n"
    date +'%m/%d/%Y %H:%M:%S'
    printf "\n"

    sleep 7200
done

SteamGiftsScript.php

<?php

// To start script --> nohup ./sg.sh >> log.txt &
// To stop script --> ps -ef
// then kill -9 pid

// Some variables
$GLOBALS['user_agent']    = 'Mozilla/5.0 (Windows NT 6.2; WOW64; rv:17.0) Gecko/20100101 Firefox/17.0';
$GLOBALS['main_url']      = "http://www.steamgifts.com/";
$GLOBALS['numberOfPages'] = 12;

// These variables needs to be change when cookie expires
$GLOBALS['cookie'] = "PHPSESSID=af3715b65f9ff0ac5c72dc76bdf967afecf75a9965f93e4646f3e62f375b9591f0508b4a9770eb207eda9d0699adc876c0a9030441e871e1e6d1841c947fc287; path:/";
$GLOBALS['xsrf']   = "a75f3fd636826b14507faf5055becb5f";

main();

function main()
{
    // Variables
    $file_name             = "TheGamesList.txt";
    //$GLOBALS['games_list'] = explode("\n", file_get_contents($file_name));
    $GLOBALS['games_list'] = file($file_name, FILE_IGNORE_NEW_LINES);
    
    // Proceed to the first page
    doRequests($GLOBALS['main_url'], 1);
}

function doRequests($current_url, $current_page)
{
    $html = getRequest($current_url);
    
    // Create a new DOM Document to handle scraping
    $dom = new DOMDocument();
    
    // In HTML5, there is no DTD to check, which will make DOM use the HTML4 Transitional DTD 
    // and that doesnt contain those elements, hence the Warnings
    libxml_use_internal_errors(true);
    $res = $dom->loadHTML($html);
    libxml_use_internal_errors(false);
    
    $xpath = new DomXPath($dom);
    $class = 'giveaway__summary';
    
    $divs = $xpath->query("//*[contains(concat(' ', normalize-space(@class), ' '), ' $class ')]");
    
    foreach ($divs as $div) {
        $node = $div->getElementsByTagName('h2')->item(0)->getElementsByTagName('a')->item(0);
        $line = $node->nodeValue;
        
        if (match($line, $GLOBALS['games_list'])) {
            // Get the url
            $game_url = $node->attributes->getNamedItem('href')->nodeValue;
            $game_url = $GLOBALS['main_url'] . $game_url;
            
            echo "Entering " . $game_url . PHP_EOL;
            
            // Launch a new request
            postRequest($game_url);
        }
    }
    
    // Proceed to the next page
    if ($current_page < $GLOBALS['numberOfPages']) {
        ++$current_page;
        $next_url = "http://www.steamgifts.com/giveaways/search?page=" . $current_page;
        doRequests($next_url, $current_page);
    }
}

function getRequest($url)
{
    // Initialize curl and following options
    $ch = curl_init();
    
    curl_setopt_array($ch, array(
        CURLOPT_RETURNTRANSFER => 1,
        CURLOPT_URL => $url,
        CURLOPT_USERAGENT => $GLOBALS['user_agent'],
        CURLOPT_COOKIE => $GLOBALS['cookie']
    ));
    
    // Grab the html from the page
    $html = curl_exec($ch);
    
    if (!$html) {
        echo "An error append with the request" . PHP_EOL;
        exit();
    }
    
    curl_close($ch);
    
    return $html;
}

function postRequest($url)
{
    $post_url  = 'http://www.steamgifts.com/ajax.php';
    $str_start = "/giveaway/";
    $str_end   = "/";
    
    $do   = "entry_insert";
    $code = getStringBetween($url, $str_start, $str_end);
    
    $fields = array(
        'xsrf_token' => urlencode($GLOBALS['xsrf']),
        'do' => urlencode($do),
        'code' => urlencode($code)
    );
    
    $fields_string = createFieldsString($fields);
    
    // Execute post request
    $ch = curl_init();
    
    curl_setopt_array($ch, array(
        CURLOPT_RETURNTRANSFER => 1,
        CURLOPT_URL => $post_url,
        CURLOPT_POST => count($fields),
        CURLOPT_POSTFIELDS => $fields_string,
        CURLOPT_USERAGENT => $GLOBALS['user_agent'],
        CURLOPT_COOKIE => $GLOBALS['cookie']
    ));
    
    $result = curl_exec($ch);
    
    curl_close($ch);
}

function createFieldsString($fields)
{
    $fields_string = "";
    
    foreach ($fields as $key => $value) {
        $fields_string .= $key . '=' . $value . '&';
    }
    
    $fields_string = rtrim($fields_string, '&');
    
    return $fields_string;
}

function contains($str, array $arr)
{
    foreach ($arr as $a) {
        if (stripos($str, $a) !== false)
            return true;
    }
    
    return false;
}

function match($str, array $arr)
{
    foreach ($arr as $a) {
        if ($str === $a)
            return true;
    }
    
    return false;
}

function getStringBetween($string, $start, $end)
{
    $string = " " . $string;
    $ini    = strpos($string, $start);
    
    if ($ini == 0)
        return "";
    
    $ini += strlen($start);
    $len = strpos($string, $end, $ini) - $ini;
    
    return substr($string, $ini, $len);
}

?>

theGamesList.txt

Far Cry 3
Far Cry 4
Fallout 4