<?php
/**
 * This code for unpaid test only
 *
 * Please replace missng parts by your code
 *
 */

class Freelancer
{

    public $user;
    public $password;

    protected $token;
    protected $csrf;

    protected function generateCSRF($length = 64) {
        $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
        $charactersLength = strlen($characters);
        $randomString = '';
        for ($i = 0; $i < $length; $i++) {
            $randomString .= $characters[rand(0, $charactersLength - 1)];
        }
        return $randomString;
    }

    public function __construct()
    {
        $this->csrf = $this->generateCSRF();
    }

    public function Login()
    {
        $login_url = 'https://www.freelancer.com/ajax/login.php';
        $fields = [
            'username' => $this->user,
            'passwd' => $this->password,
            'savelogin' => 'on',
            'fromHomePage' => 'true',
            'csrf_token' => $this->csrf
        ];
        $headers = [
            "x-xsrf-token:$this->csrf",
            "x-requested-with:XMLHttpRequest",
            ":authority:www.freelancer.com",
            ":method:POST",
            ":path:/ajax/login.php",
            ":scheme:https",
            "content-type:application/x-www-form-urlencoded; charset=UTF-8",
            "origin:https://www.freelancer.com",
            "referer:https://www.freelancer.com",
            "accept:application/json, text/javascript, */*; q=0.01",
            "accept-language:en-US,en;q=0.8,ru;q=0.6,uk;q=0.4,fr;q=0.2",
            "content-type:application/x-www-form-urlencoded; charset=UTF-8",
            "cookie:XSRF-TOKEN=$this->csrf"
        ];
        $ch = curl_init();
        curl_setopt($ch,CURLOPT_URL, $login_url);
        curl_setopt($ch,CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch,CURLOPT_POST, 1);
        curl_setopt($ch,CURLOPT_USERAGENT, "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36");
        curl_setopt($ch,CURLOPT_POSTFIELDS, $fields);
        curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
        $result = curl_exec($ch);
        echo "<pre>";
        print_r($result);
        curl_close($ch);
    }

    public function isLogged()
    {

        return true;

    }


}

try {
    $freelancerAPI = new Freelancer();
    $freelancerAPI->user = 'someuser';
    $freelancerAPI->password = 'somepass';
    $freelancerAPI->Login();
    $loginResult = $freelancerAPI->isLogged();

    echo "<pre>";
    print_r($loginResult);exit;

} catch (Exception $e) {
    echo $e->getMessage();
}