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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\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
{
public const REQUIREMENT_MATCH = 0;
public const REQUIREMENT_MISMATCH = 1;
public const ROUTE_MATCH = 2;
/** @var RequestContext */
protected $context;
/**
* Collects HTTP methods that would be allowed for the request.
*/
protected $allow = [];
/**
* Collects URI schemes that would be allowed for the request.
*
* @internal
*/
protected $allowSchemes = [];
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(string $pathinfo)
{
$this->allow = $this->allowSchemes = [];
if ($ret = $this->matchCollection(rawurldecode($pathinfo) ?: '/', $this->routes)) {
return $ret;
}
if ('/' === $pathinfo && !$this->allow && !$this->allowSchemes) {
throw new NoConfigurationException();
}
throw 0 < \count($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
*
* @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(string $pathinfo, RouteCollection $routes)
{
// HEAD and GET are equivalent as per RFC
if ('HEAD' === $method = $this->context->getMethod()) {
$method = 'GET';
}
$supportsTrailingSlash = 'GET' === $method && $this instanceof RedirectableUrlMatcherInterface;
$trimmedPathinfo = rtrim($pathinfo, '/') ?: '/';
foreach ($routes as $name => $route) {
$compiledRoute = $route->compile();
$staticPrefix = rtrim($compiledRoute->getStaticPrefix(), '/');
$requiredMethods = $route->getMethods();
// check the static prefix of the URL first. Only use the more expensive preg_match when it matches
if ('' !== $staticPrefix && 0 !== strpos($trimmedPathinfo, $staticPrefix)) {
continue;
}
$regex = $compiledRoute->getRegex();
$pos = strrpos($regex, '$');
$hasTrailingSlash = '/' === $regex[$pos - 1];
$regex = substr_replace($regex, '/?$', $pos - $hasTrailingSlash, 1 + $hasTrailingSlash);
if (!preg_match($regex, $pathinfo, $matches)) {
continue;
}
$hasTrailingVar = $trimmedPathinfo !== $pathinfo && preg_match('#\{\w+\}/?$#', $route->getPath());
if ($hasTrailingVar && ($hasTrailingSlash || (null === $m = $matches[\count($compiledRoute->getPathVariables())] ?? null) || '/' !== ($m[-1] ?? '/')) && preg_match($regex, $trimmedPathinfo, $m)) {
if ($hasTrailingSlash) {
$matches = $m;
} else {
$hasTrailingVar = false;
}
}
$hostMatches = [];
if ($compiledRoute->getHostRegex() && !preg_match($compiledRoute->getHostRegex(), $this->context->getHost(), $hostMatches)) {
continue;
}
$status = $this->handleRouteRequirements($pathinfo, $name, $route);
if (self::REQUIREMENT_MISMATCH === $status[0]) {
continue;
}
if ('/' !== $pathinfo && !$hasTrailingVar && $hasTrailingSlash === ($trimmedPathinfo === $pathinfo)) {
if ($supportsTrailingSlash && (!$requiredMethods || \in_array('GET', $requiredMethods))) {
return $this->allow = $this->allowSchemes = [];
}
continue;
}
if ($route->getSchemes() && !$route->hasScheme($this->context->getScheme())) {
$this->allowSchemes = array_merge($this->allowSchemes, $route->getSchemes());
continue;
}
if ($requiredMethods && !\in_array($method, $requiredMethods)) {
$this->allow = array_merge($this->allow, $requiredMethods);
continue;
}
return $this->getAttributes($route, $name, array_replace($matches, $hostMatches, $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).
*
* @return array An array of parameters
*/
protected function getAttributes(Route $route, string $name, array $attributes)
{
$defaults = $route->getDefaults();
if (isset($defaults['_canonical_route'])) {
$name = $defaults['_canonical_route'];
unset($defaults['_canonical_route']);
}
$attributes['_route'] = $name;
return $this->mergeDefaults($attributes, $defaults);
}
/**
* Handles specific route requirements.
*
* @return array The first element represents the status, the second contains additional information
*/
protected function handleRouteRequirements(string $pathinfo, string $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];
}
return [self::REQUIREMENT_MATCH, null];
}
/**
* Get merged default parameters.
*
* @return array Merged default parameters
*/
protected function mergeDefaults(array $params, array $defaults)
{
foreach ($params as $key => $value) {
if (!\is_int($key) && null !== $value) {
$defaults[$key] = $value;
}
}
return $defaults;
}
protected function getExpressionLanguage()
{
if (null === $this->expressionLanguage) {
if (!class_exists(ExpressionLanguage::class)) {
throw new \LogicException('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(string $pathinfo): ?Request
{
if (!class_exists(Request::class)) {
return null;
}
return Request::create($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(),
]);
}
}