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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Bridge\Twig\Extension;
use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
/**
* Provides integration of the Routing component with Twig.
*
* @author Fabien Potencier <fabien@symfony.com>
*/
class RoutingExtension extends \Twig_Extension
{
private $generator;
public function __construct(UrlGeneratorInterface $generator)
{
$this->generator = $generator;
}
/**
* Returns a list of functions to add to the existing list.
*
* @return array An array of functions
*/
public function getFunctions()
{
return array(
new \Twig_SimpleFunction('url', array($this, 'getUrl'), array('is_safe_callback' => array($this, 'isUrlGenerationSafe'))),
new \Twig_SimpleFunction('path', array($this, 'getPath'), array('is_safe_callback' => array($this, 'isUrlGenerationSafe'))),
);
}
public function getPath($name, $parameters = array(), $relative = false)
{
return $this->generator->generate($name, $parameters, $relative ? UrlGeneratorInterface::RELATIVE_PATH : UrlGeneratorInterface::ABSOLUTE_PATH);
}
public function getUrl($name, $parameters = array(), $schemeRelative = false)
{
return $this->generator->generate($name, $parameters, $schemeRelative ? UrlGeneratorInterface::NETWORK_PATH : UrlGeneratorInterface::ABSOLUTE_URL);
}
/**
* Determines at compile time whether the generated URL will be safe and thus
* saving the unneeded automatic escaping for performance reasons.
*
* The URL generation process percent encodes non-alphanumeric characters. So there is no risk
* that malicious/invalid characters are part of the URL. The only character within an URL that
* must be escaped in html is the ampersand ("&") which separates query params. So we cannot mark
* the URL generation as always safe, but only when we are sure there won't be multiple query
* params. This is the case when there are none or only one constant parameter given.
* E.g. we know beforehand this will be safe:
* - path('route')
* - path('route', {'param': 'value'})
* But the following may not:
* - path('route', var)
* - path('route', {'param': ['val1', 'val2'] }) // a sub-array
* - path('route', {'param1': 'value1', 'param2': 'value2'})
* If param1 and param2 reference placeholder in the route, it would still be safe. But we don't know.
*
* @param \Twig_Node $argsNode The arguments of the path/url function
*
* @return array An array with the contexts the URL is safe
*/
public function isUrlGenerationSafe(\Twig_Node $argsNode)
{
// support named arguments
$paramsNode = $argsNode->hasNode('parameters') ? $argsNode->getNode('parameters') : (
$argsNode->hasNode(1) ? $argsNode->getNode(1) : null
);
if (null === $paramsNode || $paramsNode instanceof \Twig_Node_Expression_Array && count($paramsNode) <= 2 &&
(!$paramsNode->hasNode(1) || $paramsNode->getNode(1) instanceof \Twig_Node_Expression_Constant)
) {
return array('html');
}
return array();
}
/**
* {@inheritdoc}
*/
public function getName()
{
return 'routing';
}
}
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