<?php

function login($username, $password, $url = 'http://moodle.tsrs.org/login/index.php')
{
    // Create base headers for use with both requests
    $parts = parse_url($url);
    $baseHeaders = array(
        'Origin: ' . $parts['scheme'] . '://' . $parts['host'],
        'User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.65 Safari/537.36',
        'Accept: */*',
    );

    // Temporary file path for the cookie jar
    $cookieJar = tempnam('/tmp', $username . '-cookie');

    // Make an initial GET request to fetch a fresh set of session cookies
    $ch = curl_init($url);

    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);

    curl_setopt($ch, CURLOPT_COOKIEFILE, $cookieJar);
    curl_setopt($ch, CURLOPT_COOKIEJAR, $cookieJar);

    curl_setopt($ch, CURLOPT_HTTPHEADER, $baseHeaders);

    curl_exec($ch);
    curl_close($ch);

    // Make the actual POST request to attempt login
    $data = array(
        'username' => $username,
        'password' => $password,
        'testcookies'=> '1',
    );
    $headers = array(
        'Referer: ' . $url,
    );

    $ch = curl_init($url);

    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, false);

    curl_setopt($ch, CURLOPT_COOKIEFILE, $cookieJar);
    curl_setopt($ch, CURLOPT_COOKIEJAR, $cookieJar);

    curl_setopt($ch, CURLOPT_HTTPHEADER, array_merge($baseHeaders, $headers));
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $data);

    $output = curl_exec($ch);
    curl_close($ch);

    // Remove the temp cookie store
    unlink($cookieJar);

    echo "\n" . $output . "\n";
}

login($_POST['username'], $_POST['password']);