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UrlMatcher.php
001 <?php
002
003 /*
004 * This file is part of the Symfony package.
005 *
006 * (c) Fabien Potencier <fabien@symfony.com>
007 *
008 * For the full copyright and license information, please view the LICENSE
009 * file that was distributed with this source code.
010 */
011
012 namespace Symfony\Component\Routing\Matcher;
013
014 use Symfony\Component\ExpressionLanguage\ExpressionFunctionProviderInterface;
015 use Symfony\Component\ExpressionLanguage\ExpressionLanguage;
016 use Symfony\Component\HttpFoundation\Request;
017 use Symfony\Component\Routing\Exception\MethodNotAllowedException;
018 use Symfony\Component\Routing\Exception\NoConfigurationException;
019 use Symfony\Component\Routing\Exception\ResourceNotFoundException;
020 use Symfony\Component\Routing\RequestContext;
021 use Symfony\Component\Routing\Route;
022 use Symfony\Component\Routing\RouteCollection;
023
024 /**
025 * UrlMatcher matches URL based on a set of routes.
026 *
027 * @author Fabien Potencier <fabien@symfony.com>
028 */
029 class UrlMatcher implements UrlMatcherInterface, RequestMatcherInterface
030 {
031 const REQUIREMENT_MATCH = 0;
032 const REQUIREMENT_MISMATCH = 1;
033 const ROUTE_MATCH = 2;
034
035 protected $context;
036 protected $allow = [];
037 protected $routes;
038 protected $request;
039 protected $expressionLanguage;
040
041 /**
042 * @var ExpressionFunctionProviderInterface[]
043 */
044 protected $expressionLanguageProviders = [];
045
046 public function __construct(RouteCollection $routes, RequestContext $context)
047 {
048 $this->routes = $routes;
049 $this->context = $context;
050 }
051
052 /**
053 * {@inheritdoc}
054 */
055 public function setContext(RequestContext $context)
056 {
057 $this->context = $context;
058 }
059
060 /**
061 * {@inheritdoc}
062 */
063 public function getContext()
064 {
065 return $this->context;
066 }
067
068 /**
069 * {@inheritdoc}
070 */
071 public function match($pathinfo)
072 {
073 $this->allow = [];
074
075 if ($ret = $this->matchCollection(rawurldecode($pathinfo), $this->routes)) {
076 return $ret;
077 }
078
079 if ('/' === $pathinfo && !$this->allow) {
080 throw new NoConfigurationException();
081 }
082
083 throw 0 < \count($this->allow) ? new MethodNotAllowedException(array_unique($this->allow)) : new ResourceNotFoundException(sprintf('No routes found for "%s".', $pathinfo));
084 }
085
086 /**
087 * {@inheritdoc}
088 */
089 public function matchRequest(Request $request)
090 {
091 $this->request = $request;
092
093 $ret = $this->match($request->getPathInfo());
094
095 $this->request = null;
096
097 return $ret;
098 }
099
100 public function addExpressionLanguageProvider(ExpressionFunctionProviderInterface $provider)
101 {
102 $this->expressionLanguageProviders[] = $provider;
103 }
104
105 /**
106 * Tries to match a URL with a set of routes.
107 *
108 * @param string $pathinfo The path info to be parsed
109 * @param RouteCollection $routes The set of routes
110 *
111 * @return array An array of parameters
112 *
113 * @throws NoConfigurationException If no routing configuration could be found
114 * @throws ResourceNotFoundException If the resource could not be found
115 * @throws MethodNotAllowedException If the resource was found but the request method is not allowed
116 */
117 protected function matchCollection($pathinfo, RouteCollection $routes)
118 {
119 // HEAD and GET are equivalent as per RFC
120 if ('HEAD' === $method = $this->context->getMethod()) {
121 $method = 'GET';
122 }
123 $supportsTrailingSlash = '/' !== $pathinfo && '' !== $pathinfo && $this instanceof RedirectableUrlMatcherInterface;
124
125 foreach ($routes as $name => $route) {
126 $compiledRoute = $route->compile();
127 $staticPrefix = $compiledRoute->getStaticPrefix();
128 $requiredMethods = $route->getMethods();
129
130 // check the static prefix of the URL first. Only use the more expensive preg_match when it matches
131 if ('' === $staticPrefix || 0 === strpos($pathinfo, $staticPrefix)) {
132 // no-op
133 } elseif (!$supportsTrailingSlash || ($requiredMethods && !\in_array('GET', $requiredMethods)) || 'GET' !== $method) {
134 continue;
135 } elseif ('/' === substr($staticPrefix, -1) && substr($staticPrefix, 0, -1) === $pathinfo) {
136 return $this->allow = [];
137 } else {
138 continue;
139 }
140 $regex = $compiledRoute->getRegex();
141
142 if ($supportsTrailingSlash && $pos = strpos($regex, '/$')) {
143 $regex = substr($regex, 0, $pos).'/?$'.substr($regex, $pos + 2);
144 $hasTrailingSlash = true;
145 } else {
146 $hasTrailingSlash = false;
147 }
148
149 if (!preg_match($regex, $pathinfo, $matches)) {
150 continue;
151 }
152
153 if ($hasTrailingSlash && '/' !== substr($pathinfo, -1)) {
154 if ((!$requiredMethods || \in_array('GET', $requiredMethods)) && 'GET' === $method) {
155 return $this->allow = [];
156 }
157 continue;
158 }
159
160 $hostMatches = [];
161 if ($compiledRoute->getHostRegex() && !preg_match($compiledRoute->getHostRegex(), $this->context->getHost(), $hostMatches)) {
162 continue;
163 }
164
165 $status = $this->handleRouteRequirements($pathinfo, $name, $route);
166
167 if (self::REQUIREMENT_MISMATCH === $status[0]) {
168 continue;
169 }
170
171 // check HTTP method requirement
172 if ($requiredMethods) {
173 if (!\in_array($method, $requiredMethods)) {
174 if (self::REQUIREMENT_MATCH === $status[0]) {
175 $this->allow = array_merge($this->allow, $requiredMethods);
176 }
177
178 continue;
179 }
180 }
181
182 return $this->getAttributes($route, $name, array_replace($matches, $hostMatches, isset($status[1]) ? $status[1] : []));
183 }
184
185 return [];
186 }
187
188 /**
189 * Returns an array of values to use as request attributes.
190 *
191 * As this method requires the Route object, it is not available
192 * in matchers that do not have access to the matched Route instance
193 * (like the PHP and Apache matcher dumpers).
194 *
195 * @param Route $route The route we are matching against
196 * @param string $name The name of the route
197 * @param array $attributes An array of attributes from the matcher
198 *
199 * @return array An array of parameters
200 */
201 protected function getAttributes(Route $route, $name, array $attributes)
202 {
203 $attributes['_route'] = $name;
204
205 return $this->mergeDefaults($attributes, $route->getDefaults());
206 }
207
208 /**
209 * Handles specific route requirements.
210 *
211 * @param string $pathinfo The path
212 * @param string $name The route name
213 * @param Route $route The route
214 *
215 * @return array The first element represents the status, the second contains additional information
216 */
217 protected function handleRouteRequirements($pathinfo, $name, Route $route)
218 {
219 // expression condition
220 if ($route->getCondition() && !$this->getExpressionLanguage()->evaluate($route->getCondition(), ['context' => $this->context, 'request' => $this->request ?: $this->createRequest($pathinfo)])) {
221 return [self::REQUIREMENT_MISMATCH, null];
222 }
223
224 // check HTTP scheme requirement
225 $scheme = $this->context->getScheme();
226 $status = $route->getSchemes() && !$route->hasScheme($scheme) ? self::REQUIREMENT_MISMATCH : self::REQUIREMENT_MATCH;
227
228 return [$status, null];
229 }
230
231 /**
232 * Get merged default parameters.
233 *
234 * @param array $params The parameters
235 * @param array $defaults The defaults
236 *
237 * @return array Merged default parameters
238 */
239 protected function mergeDefaults($params, $defaults)
240 {
241 foreach ($params as $key => $value) {
242 if (!\is_int($key)) {
243 $defaults[$key] = $value;
244 }
245 }
246
247 return $defaults;
248 }
249
250 protected function getExpressionLanguage()
251 {
252 if (null === $this->expressionLanguage) {
253 if (!class_exists('Symfony\Component\ExpressionLanguage\ExpressionLanguage')) {
254 throw new \RuntimeException('Unable to use expressions as the Symfony ExpressionLanguage component is not installed.');
255 }
256 $this->expressionLanguage = new ExpressionLanguage(null, $this->expressionLanguageProviders);
257 }
258
259 return $this->expressionLanguage;
260 }
261
262 /**
263 * @internal
264 */
265 protected function createRequest($pathinfo)
266 {
267 if (!class_exists('Symfony\Component\HttpFoundation\Request')) {
268 return null;
269 }
270
271 return Request::create($this->context->getScheme().'://'.$this->context->getHost().$this->context->getBaseUrl().$pathinfo, $this->context->getMethod(), $this->context->getParameters(), [], [], [
272 'SCRIPT_FILENAME' => $this->context->getBaseUrl(),
273 'SCRIPT_NAME' => $this->context->getBaseUrl(),
274 ]);
275 }
276 }
277