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<?php
/**
* @package akeebabackup
* @copyright Copyright (c)2006-2019 Nicholas K. Dionysopoulos / Akeeba Ltd
* @license GNU General Public License version 3, or later
*/
// Protect from unauthorized access
defined('_JEXEC') or die();
if (function_exists('akeebaBackupOnAfterRenderToFixBrokenCloudFlareRocketLoader'))
{
return;
}
/**
* CloudFlare has a broken feature called Rocket Loader. It tries to load all Javascript asynchronously disregarding
* the load order specified by the developers. As a result it causes JavaScript errors on the page which end
* up preventing any JavaScript from running. Yes, including the JavaScript which powers every single Akeeba Backup
* feature (as well as many Joomla, WordPress, Drupal etc features). For their description do read:
* https://support.cloudflare.com/hc/en-us/articles/200168056-What-does-Rocket-Loader-do-
*
* For a developer's description of what this MASSIVELY BROKEN feature does read:
* http://webmasters.stackexchange.com/a/60277
* As the guy succinctly puts it "I'm actually quite shocked that it works (although perhaps it doesn't always)".
*
* In any case, their documentation (https://support.cloudflare.com/hc/en-us/articles/200169436--How-can-I-have-Rocket-Loader-ignore-my-script-s-in-Automatic-Mode-)
* suggests adding the non-standard `data-cfasync="false"` attribute BEFORE the script's attribute. Here's the thing.
* Joomla! does NOT let you do that. So the only thing we can do is parse Joomla!'s HTML output and forcibly add this
* attribute using regular expressions search & replace. Normally this requires a system plugin to hook into Joomla's
* onAfterRender event. But we can't do that. So we do the next best thing: abuse Joomla's event system to register the
* even handler directly, without going through JPlugin. This is the kind of crap I was happy to had gotten rid of in
* Akeeba Backup 5.0 because it's slow and cumbersome. Yet, the brokenness of CloudFlare forces me to re-implement a
* slow, cumbersome approach which has a negative impact to the component's performance. Ironic, considering how
* CloudFlare is supposed to speed up your site...
*
* RECOMMENDATION: AVOID USING CLOUDFLARE AT ALL COSTS.
*
* @return void
*
* @since 5.1.3
*/
function akeebaBackupOnAfterRenderToFixBrokenCloudFlareRocketLoader()
{
// The generated HTML
$app = JFactory::getApplication();
$buffer = $app->getBody();
// Find the <head.....</head> section
$from = stripos($buffer, '<head');
if ($from === false)
{
return;
}
$to = stripos($buffer, '</head', $from + 5);
if ($to === false)
{
return;
}
// Extract <head> section
$head = substr($buffer, $from, $to - $from);
// Replace '<script...src' with '<script...data-cfasync="false" src'
$regEx = '/<script([^>]*)src\s?=\s?(\'|")/im';
$head = preg_replace($regEx, '<script$1 data-cfasync="false" src=$2', $head);
// Reconstruct the page's HTML and set it back to the buffer
$buffer = substr($buffer, 0, $from) . $head . substr($buffer, $to);
$app->setBody($buffer);
}