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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;
use Twig\Extension\AbstractExtension;
use Twig\Node\Expression\ArrayExpression;
use Twig\Node\Expression\ConstantExpression;
use Twig\Node\Node;
use Twig\TwigFunction;
/**
* Provides integration of the Routing component with Twig.
*
* @author Fabien Potencier <fabien@symfony.com>
*/
class RoutingExtension extends AbstractExtension
{
private $generator;
public function __construct(UrlGeneratorInterface $generator)
{
$this->generator = $generator;
}
/**
* Returns a list of functions to add to the existing list.
*
* @return array An array of functions
*/
public function getFunctions()
{
return [
new TwigFunction('url', [$this, 'getUrl'], ['is_safe_callback' => [$this, 'isUrlGenerationSafe']]),
new TwigFunction('path', [$this, 'getPath'], ['is_safe_callback' => [$this, 'isUrlGenerationSafe']]),
];
}
/**
* @param string $name
* @param array $parameters
* @param bool $relative
*
* @return string
*/
public function getPath($name, $parameters = [], $relative = false)
{
return $this->generator->generate($name, $parameters, $relative ? UrlGeneratorInterface::RELATIVE_PATH : UrlGeneratorInterface::ABSOLUTE_PATH);
}
/**
* @param string $name
* @param array $parameters
* @param bool $schemeRelative
*
* @return string
*/
public function getUrl($name, $parameters = [], $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 Node $argsNode The arguments of the path/url function
*
* @return array An array with the contexts the URL is safe
*
* @final
*/
public function isUrlGenerationSafe(Node $argsNode)
{
// support named arguments
$paramsNode = $argsNode->hasNode('parameters') ? $argsNode->getNode('parameters') : (
$argsNode->hasNode(1) ? $argsNode->getNode(1) : null
);
if (null === $paramsNode || $paramsNode instanceof ArrayExpression && \count($paramsNode) <= 2 &&
(!$paramsNode->hasNode(1) || $paramsNode->getNode(1) instanceof ConstantExpression)
) {
return ['html'];
}
return [];
}
/**
* {@inheritdoc}
*/
public function getName()
{
return 'routing';
}
}