From 9aa09e1ff59843ad7aa35d63b9294ae4ed7318fa Mon Sep 17 00:00:00 2001
From: Nasim <nasim.nabavi@scrutinizer-ci.com>
Date: Thu, 14 Jun 2018 10:55:32 +0200
Subject: [PATCH] [Routing] fix URL generation with look-around requirements

---
 .../Routing/Generator/UrlGenerator.php        | 24 ++++++++++++++++---
 .../Tests/Generator/UrlGeneratorTest.php      | 24 +++++++++++++++++++
 2 files changed, 45 insertions(+), 3 deletions(-)

diff --git a/src/Symfony/Component/Routing/Generator/UrlGenerator.php b/src/Symfony/Component/Routing/Generator/UrlGenerator.php
index 6ed70cabdfc21..54ae73ccd41fe 100644
--- a/src/Symfony/Component/Routing/Generator/UrlGenerator.php
+++ b/src/Symfony/Component/Routing/Generator/UrlGenerator.php
@@ -140,14 +140,18 @@ protected function doGenerate($variables, $defaults, $requirements, $tokens, $pa
         foreach ($tokens as $token) {
             if ('variable' === $token[0]) {
                 if (!$optional || !array_key_exists($token[3], $defaults) || null !== $mergedParams[$token[3]] && (string) $mergedParams[$token[3]] !== (string) $defaults[$token[3]]) {
+                    $variablePattern = $token[2];
+                    if ($this->hasLookAround($token[2])) {
+                        $variablePattern = $this->removeLookAround($token[2]);
+                    }
                     // check requirement
-                    if (null !== $this->strictRequirements && !preg_match('#^'.$token[2].'$#'.(empty($token[4]) ? '' : 'u'), $mergedParams[$token[3]])) {
+                    if (null !== $this->strictRequirements && !preg_match('#^'.$variablePattern.'$#'.(empty($token[4]) ? '' : 'u'), $mergedParams[$token[3]])) {
                         if ($this->strictRequirements) {
-                            throw new InvalidParameterException(strtr($message, array('{parameter}' => $token[3], '{route}' => $name, '{expected}' => $token[2], '{given}' => $mergedParams[$token[3]])));
+                            throw new InvalidParameterException(strtr($message, array('{parameter}' => $token[3], '{route}' => $name, '{expected}' => $variablePattern, '{given}' => $mergedParams[$token[3]])));
                         }
 
                         if ($this->logger) {
-                            $this->logger->error($message, array('parameter' => $token[3], 'route' => $name, 'expected' => $token[2], 'given' => $mergedParams[$token[3]]));
+                            $this->logger->error($message, array('parameter' => $token[3], 'route' => $name, 'expected' => $variablePattern, 'given' => $mergedParams[$token[3]]));
                         }
 
                         return;
@@ -318,4 +322,18 @@ public static function getRelativePath($basePath, $targetPath)
             || false !== ($colonPos = strpos($path, ':')) && ($colonPos < ($slashPos = strpos($path, '/')) || false === $slashPos)
             ? "./$path" : $path;
     }
+
+    private function hasLookAround($path)
+    {
+        if (false === $i = strpos($path, '(?')) {
+            return false;
+        }
+
+        return false !== strpos($path, '(?=', $i) || false !== strpos($path, '(?<=', $i) || false !== strpos($path, '(?!', $i) || false !== strpos($path, '(?<!', $i);
+    }
+
+    private function removeLookAround($path)
+    {
+        return preg_replace('/\(\?(?:=|<=|!|<!)((?:[^()\\\\]+|\\\\.|\((?1)\))*)\)/', '', $path);
+    }
 }
diff --git a/src/Symfony/Component/Routing/Tests/Generator/UrlGeneratorTest.php b/src/Symfony/Component/Routing/Tests/Generator/UrlGeneratorTest.php
index d4bf18ccac929..056aefefc915d 100644
--- a/src/Symfony/Component/Routing/Tests/Generator/UrlGeneratorTest.php
+++ b/src/Symfony/Component/Routing/Tests/Generator/UrlGeneratorTest.php
@@ -703,6 +703,30 @@ public function testFragmentsCanBeDefinedAsDefaults()
         $this->assertEquals('/app.php/testing#fragment', $url);
     }
 
+    public function testLookAheadPositiveInRequirements()
+    {
+        $routes = $this->getRoutes('test', new Route('/{foo}/b(ar/{baz}', array(), array('foo' => '.+(?=/b\\(ar/)', 'baz' => '.+?')));
+        $this->assertSame('/app.php/a/b/b%28ar/c/d/e', $this->getGenerator($routes)->generate('test', array('foo' => 'a/b', 'baz' => 'c/d/e')));
+    }
+
+    public function testLookAheadNegativeInRequirementss()
+    {
+        $routes = $this->getRoutes('test', new Route('/{foo}/bar/{baz}', array(), array('foo' => '.+(?!$)', 'baz' => '.+?')));
+        $this->assertSame('/app.php/a/b/bar/c/d/e', $this->getGenerator($routes)->generate('test', array('foo' => 'a/b', 'baz' => 'c/d/e')));
+    }
+
+    public function testLookBehindPositiveInRequirements()
+    {
+        $routes = $this->getRoutes('test', new Route('/bar/{foo}/bam/{baz}', array(), array('foo' => '(?<=/bar/).+', 'baz' => '.+?')));
+        $this->assertSame('/app.php/bar/a/b/bam/c/d/e', $this->getGenerator($routes)->generate('test', array('foo' => 'a/b', 'baz' => 'c/d/e')));
+    }
+
+    public function testLookBehindNegativeInRequirements()
+    {
+        $routes = $this->getRoutes('test', new Route('/bar/{foo}/bam/{baz}', array(), array('foo' => '(?<!^).+', 'baz' => '.+?')));
+        $this->assertSame('/app.php/bar/a/b/bam/c/d/e', $this->getGenerator($routes)->generate('test', array('foo' => 'a/b', 'baz' => 'c/d/e')));
+    }
+
     protected function getGenerator(RouteCollection $routes, array $parameters = array(), $logger = null)
     {
         $context = new RequestContext('/app.php');