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Edit File: RoutingExtension.php

<?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;
    }

/**
     * {@inheritdoc}
     */
    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 since version 3.4, type-hint to be changed to "\Twig\Node\Node" in 4.0
     */
    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 || $paramsNode instanceof ArrayExpression && \count($paramsNode) <= 2 &&
            (!$paramsNode->hasNode(1) || $paramsNode->getNode(1) instanceof ConstantExpression)
        ) {
            return ['html'];
        }

return [];
    }

/**
     * {@inheritdoc}
     */
    public function getName()
    {
        return 'routing';
    }
}