proxy.php

<?php

/* HTTP proxy for Piwik's tracker API. */

//$user_agent = 'Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2228.0 Safari/537.36 k0nsl-proxy/0.1a';
$user_agent = 'k0nsl-piwik-proxy/01a';

if (!isset($PIWIK_URL)) {
    $PIWIK_URL = 'https://s.k0nsl.org/';
}

// Edit the line below, and replace xyz by the token_auth for the user "UserTrackingAPI"
// which you created when you followed instructions above.
if (!isset($TOKEN_AUTH)) {
    $TOKEN_AUTH = '5f2a2cb51210039fba3d549fcf4665d2';
}

// Maximum time, in seconds, to wait for the Piwik server to return the 1*1 GIF
if (!isset($timeout)) {
    $timeout = 5;
}

function sendHeader($header, $replace = true)
{
    headers_sent() || header($header, $replace);
}

function arrayValue($array, $key, $value = null)
{
    if (!empty($array[$key])) {
        $value = $array[$key];
    }

    return $value;
}

// DO NOT MODIFY BELOW
// ---------------------------
// 1) PIWIK.JS PROXY: No _GET parameter, we serve the JS file
if (empty($_GET)) {
    $modifiedSince = false;
    if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE'])) {
        $modifiedSince = $_SERVER['HTTP_IF_MODIFIED_SINCE'];
        // strip any trailing data appended to header
        if (false !== ($semicolon = strpos($modifiedSince, ';'))) {
            $modifiedSince = substr($modifiedSince, 0, $semicolon);
        }
        $modifiedSince = strtotime($modifiedSince);
    }
    // Re-download the piwik.js once a day maximum
    $lastModified = time() - 86400;

    // set HTTP response headers
    sendHeader('Vary: Accept-Encoding');

    // Returns 304 if not modified since
    if (!empty($modifiedSince) && $modifiedSince > $lastModified) {
        sendHeader(sprintf('%s 304 Not Modified', $_SERVER['SERVER_PROTOCOL']));
    } else {
        sendHeader('Last-Modified: '.gmdate('D, d M Y H:i:s').' GMT');
        sendHeader('Content-Type: application/javascript; charset=UTF-8');
        if ($piwikJs = file_get_contents($PIWIK_URL.'piwik.js')) {
            echo $piwikJs;
        } else {
            //sendHeader($_SERVER['SERVER_PROTOCOL'] . '505 Internal server error');
        }
    }
    exit;
}

@ini_set('magic_quotes_runtime', 0);

// 2) PIWIK.PHP PROXY: GET parameters found, this is a tracking request, we redirect it to Piwik
$url = sprintf('%spiwik.php?cip=%s&token_auth=%s&', $PIWIK_URL, getVisitIp(), $TOKEN_AUTH);

foreach ($_GET as $key => $value) {
    $url .= urlencode($key).'='.urlencode($value).'&';
}
sendHeader('Content-Type: image/gif');
$stream_options = array('http' => array(
    'user_agent' => arrayValue($_SERVER, 'HTTP_USER_AGENT', ''),
    'header' => sprintf("Accept-Language: %s\r\n", str_replace(array("\n", "\t", "\r"), '', arrayValue($_SERVER, 'HTTP_ACCEPT_LANGUAGE', ''))),
    'timeout' => $timeout,
));
$ctx = stream_context_create($stream_options);

if (version_compare(PHP_VERSION, '5.3.0', '<')) {

    // PHP 5.2 breaks with the new 204 status code so we force returning the image every time
    echo file_get_contents($url.'&send_image=1', 0, $ctx);
} else {

    // PHP 5.3 and above
    $content = file_get_contents($url, 0, $ctx);

    // Forward the HTTP response code
    if (!headers_sent() && isset($http_response_header[0])) {
        header($http_response_header[0]);
    }

    echo $content;
}

function getVisitIp()
{
    $matchIp = '/^([0-9]{1,3}\.){3}[0-9]{1,3}$/';
    $ipKeys = array(
        'HTTP_X_FORWARDED_FOR',
        'HTTP_CLIENT_IP',
        'HTTP_CF_CONNECTING_IP',
    );
    foreach ($ipKeys as $ipKey) {
        if (isset($_SERVER[$ipKey])
            && preg_match($matchIp, $_SERVER[$ipKey])) {
            return $_SERVER[$ipKey];
        }
    }

    return arrayValue($_SERVER, 'REMOTE_ADDR');
}