[Routing] fix encoding of path segments '.' and '..'

src/Symfony/Component/Routing/Generator/UrlGenerator.php

@@ -179,13 +179,18 @@ protected function doGenerate($variables, $defaults, $requirements, $tokens, $pa
             }
         }
 
-        if (!$url) {
+        if ('' === $url) {
             $url = '/';
         }
 
         // do not encode the contexts base url as it is already encoded (see Symfony\Component\HttpFoundation\Request)
         $url = $this->context->getBaseUrl().strtr(rawurlencode($url), $this->decodedChars);
 
+        // the path segments "." and ".." are interpreted as relative reference when resolving a URI; see http://tools.ietf.org/html/rfc3986#section-3.3
+        // so we need to encode them as they are not used for this purpose here
+        // otherwise we would generate a URI that, when followed by a user agent (e.g. browser), does not match this route
+        $url = preg_replace(array('#/\.\.(/|$)#', '#/\.(/|$)#'), array('/%2E%2E$1', '/%2E$1'), $url);
+
         // add a query string if needed
         $extra = array_diff_key($originParameters, $variables, $defaults);
         if ($extra && $query = http_build_query($extra, '', '&')) {

src/Symfony/Component/Routing/Tests/Generator/UrlGeneratorTest.php

@@ -245,6 +245,16 @@ public function testUrlEncoding()
         );
     }
 
+    public function testEncodingOfRelativePathSegments()
+    {
+        $routes = $this->getRoutes('test', new Route('/dir/../dir/..'));
+        $this->assertSame('/app.php/dir/%2E%2E/dir/%2E%2E', $this->getGenerator($routes)->generate('test'));
+        $routes = $this->getRoutes('test', new Route('/dir/./dir/.'));
+        $this->assertSame('/app.php/dir/%2E/dir/%2E', $this->getGenerator($routes)->generate('test'));
+        $routes = $this->getRoutes('test', new Route('/a./.a/a../..a/...'));
+        $this->assertSame('/app.php/a./.a/a../..a/...', $this->getGenerator($routes)->generate('test'));
+    }
+
     protected function getGenerator(RouteCollection $routes, array $parameters = array(), $logger = null)
     {
         $context = new RequestContext('/app.php');