Merge branch '2.8' into 3.0

* 2.8: (23 commits)
  [Filesystem] Better error handling in remove()
  [DependencyInjection] Add coverage for invalid Expression in exportParameters
  [DependencyInjection] Add coverage for all invalid arguments in exportParameters
  anonymous services are always private
  [Console] Correct time formatting.
  [WebProfilerBundle] Fixed error from unset twig variable
  Force profiler toolbar svg display
  [DependencyInjection] Resolve aliases before removing abstract services + add tests
  Fix Dom Crawler select option with empty value
  Remove unnecessary option assignment
  fix tests (use non-deprecated options)
  remove unused variable
  mock the proper method
  [PropertyAccess] Fix regression
  [HttpFoundation] Improve phpdoc
  [Logging] Add support for firefox in ChromePhpHandler
  Windows 10 version check in just one line
  Detect CLI color support for Windows 10 build 10586
  [Security] Fixed SwitchUserListener when exiting an impersonication with AnonymousToken
  [EventDispatcher] Try first if the event is Stopped
  ...

Author: xabbuh

Firewall/SwitchUserListener.php

@@ -12,6 +12,7 @@
 namespace Symfony\Component\Security\Http\Firewall;
 
 use Symfony\Component\Security\Core\Exception\AccessDeniedException;
+use Symfony\Component\Security\Core\User\UserInterface;
 use Symfony\Component\Security\Core\User\UserProviderInterface;
 use Symfony\Component\Security\Core\User\UserCheckerInterface;
 use Symfony\Component\Security\Core\Authorization\AccessDecisionManagerInterface;
@@ -161,7 +162,7 @@ private function attemptExitUser(Request $request)
             throw new AuthenticationCredentialsNotFoundException('Could not find original Token object.');
         }
 
-        if (null !== $this->dispatcher) {
+        if (null !== $this->dispatcher && $original->getUser() instanceof UserInterface) {
             $user = $this->provider->refreshUser($original->getUser());
             $switchEvent = new SwitchUserEvent($request, $user);
             $this->dispatcher->dispatch(SecurityEvents::SWITCH_USER, $switchEvent);

Tests/Firewall/SwitchUserListenerTest.php

@@ -158,6 +158,59 @@ public function testExitUserDispatchesEventWithRefreshedUser()
         $listener->handle($this->event);
     }
 
+    public function testExitUserDoesNotDispatchEventWithStringUser()
+    {
+        $originalUser = 'anon.';
+        $this
+            ->userProvider
+            ->expects($this->never())
+            ->method('refreshUser');
+        $originalToken = $this->getToken();
+        $originalToken
+            ->expects($this->any())
+            ->method('getUser')
+            ->willReturn($originalUser);
+        $role = $this
+            ->getMockBuilder('Symfony\Component\Security\Core\Role\SwitchUserRole')
+            ->disableOriginalConstructor()
+            ->getMock();
+        $role
+            ->expects($this->any())
+            ->method('getSource')
+            ->willReturn($originalToken);
+        $this
+            ->tokenStorage
+            ->expects($this->any())
+            ->method('getToken')
+            ->willReturn($this->getToken(array($role)));
+        $this
+            ->request
+            ->expects($this->any())
+            ->method('get')
+            ->with('_switch_user')
+            ->willReturn('_exit');
+        $this
+            ->request
+            ->query
+            ->expects($this->any())
+            ->method('all')
+            ->will($this->returnValue(array()));
+        $this
+            ->request
+            ->expects($this->any())
+            ->method('getUri')
+            ->willReturn('/');
+
+        $dispatcher = $this->getMock('Symfony\Component\EventDispatcher\EventDispatcherInterface');
+        $dispatcher
+            ->expects($this->never())
+            ->method('dispatch')
+        ;
+
+        $listener = new SwitchUserListener($this->tokenStorage, $this->userProvider, $this->userChecker, 'provider123', $this->accessDecisionManager, null, '_switch_user', 'ROLE_ALLOWED_TO_SWITCH', $dispatcher);
+        $listener->handle($this->event);
+    }
+
     /**
      * @expectedException \Symfony\Component\Security\Core\Exception\AccessDeniedException
      */