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Edit File: UrlMatcher.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\Component\Routing\Matcher;

use Symfony\Component\ExpressionLanguage\ExpressionFunctionProviderInterface;
use Symfony\Component\ExpressionLanguage\ExpressionLanguage;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\Routing\Exception\MethodNotAllowedException;
use Symfony\Component\Routing\Exception\NoConfigurationException;
use Symfony\Component\Routing\Exception\ResourceNotFoundException;
use Symfony\Component\Routing\RequestContext;
use Symfony\Component\Routing\Route;
use Symfony\Component\Routing\RouteCollection;

/**
 * UrlMatcher matches URL based on a set of routes.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 */
class UrlMatcher implements UrlMatcherInterface, RequestMatcherInterface
{
    const REQUIREMENT_MATCH = 0;
    const REQUIREMENT_MISMATCH = 1;
    const ROUTE_MATCH = 2;

protected $context;
    protected $allow = [];
    protected $routes;
    protected $request;
    protected $expressionLanguage;

/**
     * @var ExpressionFunctionProviderInterface[]
     */
    protected $expressionLanguageProviders = [];

public function __construct(RouteCollection $routes, RequestContext $context)
    {
        $this->routes = $routes;
        $this->context = $context;
    }

/**
     * {@inheritdoc}
     */
    public function setContext(RequestContext $context)
    {
        $this->context = $context;
    }

/**
     * {@inheritdoc}
     */
    public function getContext()
    {
        return $this->context;
    }

/**
     * {@inheritdoc}
     */
    public function match($pathinfo)
    {
        $this->allow = [];

if ($ret = $this->matchCollection(rawurldecode($pathinfo), $this->routes)) {
            return $ret;
        }

if ('/' === $pathinfo && !$this->allow) {
            throw new NoConfigurationException();
        }

throw 0 < \count($this->allow) ? new MethodNotAllowedException(array_unique($this->allow)) : new ResourceNotFoundException(sprintf('No routes found for "%s".', $pathinfo));
    }

/**
     * {@inheritdoc}
     */
    public function matchRequest(Request $request)
    {
        $this->request = $request;

$ret = $this->match($request->getPathInfo());

$this->request = null;

return $ret;
    }

public function addExpressionLanguageProvider(ExpressionFunctionProviderInterface $provider)
    {
        $this->expressionLanguageProviders[] = $provider;
    }

/**
     * Tries to match a URL with a set of routes.
     *
     * @param string          $pathinfo The path info to be parsed
     * @param RouteCollection $routes   The set of routes
     *
     * @return array An array of parameters
     *
     * @throws NoConfigurationException  If no routing configuration could be found
     * @throws ResourceNotFoundException If the resource could not be found
     * @throws MethodNotAllowedException If the resource was found but the request method is not allowed
     */
    protected function matchCollection($pathinfo, RouteCollection $routes)
    {
        // HEAD and GET are equivalent as per RFC
        if ('HEAD' === $method = $this->context->getMethod()) {
            $method = 'GET';
        }
        $supportsTrailingSlash = '/' !== $pathinfo && '' !== $pathinfo && $this instanceof RedirectableUrlMatcherInterface;

foreach ($routes as $name => $route) {
            $compiledRoute = $route->compile();
            $staticPrefix = $compiledRoute->getStaticPrefix();
            $requiredMethods = $route->getMethods();

// check the static prefix of the URL first. Only use the more expensive preg_match when it matches
            if ('' === $staticPrefix || 0 === strpos($pathinfo, $staticPrefix)) {
                // no-op
            } elseif (!$supportsTrailingSlash || ($requiredMethods && !\in_array('GET', $requiredMethods)) || 'GET' !== $method) {
                continue;
            } elseif ('/' === substr($staticPrefix, -1) && substr($staticPrefix, 0, -1) === $pathinfo) {
                return $this->allow = [];
            } else {
                continue;
            }
            $regex = $compiledRoute->getRegex();

if ($supportsTrailingSlash && $pos = strpos($regex, '/$')) {
                $regex = substr($regex, 0, $pos).'/?$'.substr($regex, $pos + 2);
                $hasTrailingSlash = true;
            } else {
                $hasTrailingSlash = false;
            }

if (!preg_match($regex, $pathinfo, $matches)) {
                continue;
            }

if ($hasTrailingSlash && '/' !== substr($pathinfo, -1)) {
                if ((!$requiredMethods || \in_array('GET', $requiredMethods)) && 'GET' === $method) {
                    return $this->allow = [];
                }
                continue;
            }

$hostMatches = [];
            if ($compiledRoute->getHostRegex() && !preg_match($compiledRoute->getHostRegex(), $this->context->getHost(), $hostMatches)) {
                continue;
            }

$status = $this->handleRouteRequirements($pathinfo, $name, $route);

if (self::REQUIREMENT_MISMATCH === $status[0]) {
                continue;
            }

// check HTTP method requirement
            if ($requiredMethods) {
                if (!\in_array($method, $requiredMethods)) {
                    if (self::REQUIREMENT_MATCH === $status[0]) {
                        $this->allow = array_merge($this->allow, $requiredMethods);
                    }

continue;
                }
            }

return $this->getAttributes($route, $name, array_replace($matches, $hostMatches, isset($status[1]) ? $status[1] : []));
        }

return [];
    }

/**
     * Returns an array of values to use as request attributes.
     *
     * As this method requires the Route object, it is not available
     * in matchers that do not have access to the matched Route instance
     * (like the PHP and Apache matcher dumpers).
     *
     * @param Route  $route      The route we are matching against
     * @param string $name       The name of the route
     * @param array  $attributes An array of attributes from the matcher
     *
     * @return array An array of parameters
     */
    protected function getAttributes(Route $route, $name, array $attributes)
    {
        $attributes['_route'] = $name;

return $this->mergeDefaults($attributes, $route->getDefaults());
    }

/**
     * Handles specific route requirements.
     *
     * @param string $pathinfo The path
     * @param string $name     The route name
     * @param Route  $route    The route
     *
     * @return array The first element represents the status, the second contains additional information
     */
    protected function handleRouteRequirements($pathinfo, $name, Route $route)
    {
        // expression condition
        if ($route->getCondition() && !$this->getExpressionLanguage()->evaluate($route->getCondition(), ['context' => $this->context, 'request' => $this->request ?: $this->createRequest($pathinfo)])) {
            return [self::REQUIREMENT_MISMATCH, null];
        }

// check HTTP scheme requirement
        $scheme = $this->context->getScheme();
        $status = $route->getSchemes() && !$route->hasScheme($scheme) ? self::REQUIREMENT_MISMATCH : self::REQUIREMENT_MATCH;

return [$status, null];
    }

/**
     * Get merged default parameters.
     *
     * @param array $params   The parameters
     * @param array $defaults The defaults
     *
     * @return array Merged default parameters
     */
    protected function mergeDefaults($params, $defaults)
    {
        foreach ($params as $key => $value) {
            if (!\is_int($key)) {
                $defaults[$key] = $value;
            }
        }

return $defaults;
    }

protected function getExpressionLanguage()
    {
        if (null === $this->expressionLanguage) {
            if (!class_exists('Symfony\Component\ExpressionLanguage\ExpressionLanguage')) {
                throw new \RuntimeException('Unable to use expressions as the Symfony ExpressionLanguage component is not installed.');
            }
            $this->expressionLanguage = new ExpressionLanguage(null, $this->expressionLanguageProviders);
        }

return $this->expressionLanguage;
    }

/**
     * @internal
     */
    protected function createRequest($pathinfo)
    {
        if (!class_exists('Symfony\Component\HttpFoundation\Request')) {
            return null;
        }

return Request::create($this->context->getScheme().'://'.$this->context->getHost().$this->context->getBaseUrl().$pathinfo, $this->context->getMethod(), $this->context->getParameters(), [], [], [
            'SCRIPT_FILENAME' => $this->context->getBaseUrl(),
            'SCRIPT_NAME' => $this->context->getBaseUrl(),
        ]);
    }
}