PiwikProxyServiceProvider allows you to quickly create a proxying route for Piwik tracking to hide the location of Piwik's server.

The only requirement is to have file_get_contents switched to enable URL fetching. But you can ommit this requirement by providing own implementation of Mach\Silex\Piwik\RemoteContentInterface which is used to execute calls to Piwik's installation. By default it uses file_get_contents but you can provide your own version which will use cURL for instance.

Add requirement: php composer.phar require mach/piwik-proxy-service-provider:~1.0.

And update it php composer.phar update mach/piwik-proxy-service-provider.

Below is a structure of configuration array for the provider, and descriptions for each keys.

{
    "piwik.proxy.url": "<url-to-piwik-installation>",
    "piwik.proxy.token": "<token-with-admin-access-to-sites>",
    "piwik.proxy.timeout": "<timeout-in-seconds-for-request>",
    "piwik.proxy.cache": "<cache-in-seconds-for-js-file>"
}

By default, piwik.proxy.timeout is set to 5, and piwik.proxy.cache to 86400 which gives us a daily cache for requesting javascript tracker.

To use the provider you have to register it first and provide options:

<?php

use Silex\Application;
use Mach\Silex\Piwik\PiwikProxyServiceProvider;

$app = new Application();
$app->register(new PiwikProxyServiceProvider(), array(
    'piwik.proxy.url' => 'http://piwik.example.com',
    'piwik.proxy.token' => 'xyz',
));

The provider registers a closure under $app['piwik.proxy']. The closure always returns an instance of Symfony\Component\HttpFoundation\Response.

Next step is to create a route (e.g. /tracker) that will serve the JavaScript file and handle tracking requests.

<?php

$app->get('/tracker', function(Request $request) use ($app) {
    return $app['piwik.proxy']($request);
});

To override default settings, you can pass array of options as second argument to the closure:

<?php

$app->get('/tracker/{id}', function(Request $request, $id) use ($app) {
    return $app['piwik.proxy']($request, array(
        'url' => "https://piwik-$id.example.com"
    ));
});

Change your tracking code to:

<!-- Piwik -->
<script type="text/javascript">
    var _paq = _paq || [];
    _paq.push(["setDocumentTitle", document.domain + "/" + document.title]);
    _paq.push(["setCookieDomain", "*.yourdomain.net"]);
    _paq.push(['trackPageView']);
    _paq.push(['enableLinkTracking']);
    (function() {
        _paq.push(['setTrackerUrl', '/tracker']);
        _paq.push(['setSiteId', 1]);
        var d=document, g=d.createElement('script'), s=d.getElementsByTagName('script')[0];
        g.type='text/javascript'; g.async=true; g.defer=true; g.src='/tracker'; s.parentNode.insertBefore(g,s);
    })();
</script>
<noscript><p><img src="/tracker?idsite=1" style="border:0;" alt="" /></p></noscript>
<!-- End Piwik Code -->

PiwikProxyServiceProvider is licensed under the MIT license.