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<?php
/**
* @package AdminTools
* @copyright Copyright (c)2010-2015 Nicholas K. Dionysopoulos
* @license GNU General Public License version 3, or later
*/
defined('_JEXEC') or die;
class AtsystemFeatureLinkmigration extends AtsystemFeatureAbstract
{
/** @var null|array The domains to migrate from */
protected $oldDomains = null;
/** @var null|string The domain of this site */
protected $myDomain = null;
/**
* Is this feature enabled?
*
* @return bool
*/
public function isEnabled()
{
// We only use this feature in the front-end
if (F0FPlatform::getInstance()->isBackend())
{
return false;
}
// The feature must be enabled
if ($this->cparams->getValue('linkmigration', 0) != 1)
{
return false;
}
// Populate the old domains array
$this->populateOldDomains();
// If there are no old domains to migrate from, what exactly am I doing here?
if (empty($this->oldDomains))
{
return false;
}
return true;
}
/**
* Provides link migration services. All absolute links pointing to any of the old domain names
* are being rewritten to point to the current domain name. This runs a full page replacement
* using Regular Expressions, so even menus with absolute URLs will be migrated!
*/
public function onAfterRenderLatebound()
{
$this->populateOldDomains();
if (empty($this->oldDomains))
{
// If there are no old domains to migrate from, what exactly am I doing here?
return;
}
$this->populateMyDomain();
if (method_exists($this->app, 'getBody'))
{
$buffer = $this->app->getBody();
}
else
{
$buffer = JResponse::getBody();
}
$pattern = '/(href|src)=\"([^"]*)\"/i';
$number_of_matches = preg_match_all($pattern, $buffer, $matches, PREG_OFFSET_CAPTURE);
if ($number_of_matches > 0)
{
$substitutions = $matches[2];
$last_position = 0;
$temp = '';
// Loop all URLs
foreach ($substitutions as &$entry)
{
// Copy unchanged part, if it exists
if ($entry[1] > 0)
{
$temp .= substr($buffer, $last_position, $entry[1] - $last_position);
}
// Add the new URL
$temp .= $this->replaceDomain($entry[0]);
// Calculate next starting offset
$last_position = $entry[1] + strlen($entry[0]);
}
// Do we have any remaining part of the string we have to copy?
if ($last_position < strlen($buffer))
{
$temp .= substr($buffer, $last_position);
}
// Replace content with the processed one
unset($buffer);
if (method_exists($this->app, 'setBody'))
{
$this->app->setBody($temp);
}
else
{
JResponse::setBody($temp);
}
unset($temp);
}
}
/**
* Replaces a URL's domain name (if it is in the substitution list) with the
* current site's domain name
*
* @param $url string The URL to process
*
* @return string The processed URL
*/
protected function replaceDomain($url)
{
foreach ($this->oldDomains as $domain)
{
if (substr($url, 0, strlen($domain)) == $domain)
{
return $this->myDomain . substr($url, strlen($domain));
}
elseif (substr($url, 0, strlen($domain) + 7) == 'http://' . $domain)
{
return 'http://' . $this->myDomain . substr($url, strlen($domain) + 7);
}
elseif (substr($url, 0, strlen($domain) + 8) == 'https://' . $domain)
{
return 'https://' . $this->myDomain . substr($url, strlen($domain) + 8);
}
}
return $url;
}
/**
* Populates the oldDomains array
*
* @return void
*/
protected function populateOldDomains()
{
$this->oldDomains = array();
$temp = explode("\n", $this->cparams->getValue('migratelist', ''));
if (!empty($temp))
{
foreach ($temp as $entry)
{
if (substr($entry, -1) == '/')
{
$entry = substr($entry, 0, -1);
}
if (substr($entry, 0, 7) == 'http://')
{
$entry = substr($entry, 7);
}
if (substr($entry, 0, 8) == 'https://')
{
$entry = substr($entry, 8);
}
$this->oldDomains[] = $entry;
}
}
}
/**
* Populates the myDomain variable
*
* @return void
*/
protected function populateMyDomain()
{
$this->myDomain = JURI::base(false);
if (substr($this->myDomain, -1) == '/')
{
$this->myDomain = substr($this->myDomain, 0, -1);
}
if (substr($this->myDomain, 0, 7) == 'http://')
{
$this->myDomain = substr($this->myDomain, 7);
}
if (substr($this->myDomain, 0, 8) == 'https://')
{
$this->myDomain = substr($this->myDomain, 8);
}
}
}