Merge branch '3.4' into 4.0

* 3.4:
  [HttpFoundation] fix registration of session proxies
  failing test to reproduce session problem
  [HttpFoundation] fix session tracking counter

Author: nicolas-grekas

Session/Session.php

@@ -54,8 +54,6 @@ public function __construct(SessionStorageInterface $storage = null, AttributeBa
      */
     public function start()
     {
-        ++$this->usageIndex;
-
         return $this->storage->start();
     }
 
@@ -160,7 +158,9 @@ public function getUsageIndex()
      */
     public function isEmpty()
     {
-        ++$this->usageIndex;
+        if ($this->isStarted()) {
+            ++$this->usageIndex;
+        }
         foreach ($this->data as &$data) {
             if (!empty($data)) {
                 return false;
@@ -185,8 +185,6 @@ public function invalidate($lifetime = null)
      */
     public function migrate($destroy = false, $lifetime = null)
     {
-        ++$this->usageIndex;
-
         return $this->storage->regenerate($destroy, $lifetime);
     }
 
@@ -195,8 +193,6 @@ public function migrate($destroy = false, $lifetime = null)
      */
     public function save()
     {
-        ++$this->usageIndex;
-
         $this->storage->save();
     }
 

Session/SessionBagProxy.php

@@ -44,6 +44,9 @@ public function getBag()
      */
     public function isEmpty()
     {
+        if (!isset($this->data[$this->bag->getStorageKey()])) {
+            return true;
+        }
         ++$this->usageIndex;
 
         return empty($this->data[$this->bag->getStorageKey()]);
@@ -81,8 +84,6 @@ public function getStorageKey()
      */
     public function clear()
     {
-        ++$this->usageIndex;
-
         return $this->bag->clear();
     }
 }

Session/Storage/NativeSessionStorage.php

@@ -407,8 +407,6 @@ public function setSaveHandler($saveHandler = null)
         }
 
         if ($this->saveHandler instanceof SessionHandlerProxy) {
-            session_set_save_handler($this->saveHandler->getHandler(), false);
-        } elseif ($this->saveHandler instanceof \SessionHandlerInterface) {
             session_set_save_handler($this->saveHandler, false);
         }
     }

Session/Storage/Proxy/SessionHandlerProxy.php

@@ -14,7 +14,7 @@
 /**
  * @author Drak <drak@zikula.org>
  */
-class SessionHandlerProxy extends AbstractProxy implements \SessionHandlerInterface
+class SessionHandlerProxy extends AbstractProxy implements \SessionHandlerInterface, \SessionUpdateTimestampHandlerInterface
 {
     protected $handler;
 
@@ -82,4 +82,20 @@ public function gc($maxlifetime)
     {
         return (bool) $this->handler->gc($maxlifetime);
     }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function validateId($sessionId)
+    {
+        return !$this->handler instanceof \SessionUpdateTimestampHandlerInterface || $this->handler->validateId($sessionId);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function updateTimestamp($sessionId, $data)
+    {
+        return $this->handler instanceof \SessionUpdateTimestampHandlerInterface ? $this->handler->updateTimestamp($sessionId, $data) : $this->write($sessionId, $data);
+    }
 }

Tests/Session/Storage/Proxy/SessionHandlerProxyTest.php

@@ -121,4 +121,37 @@ public function testGc()
 
         $this->proxy->gc(86400);
     }
+
+    /**
+     * @requires PHPUnit 5.1
+     */
+    public function testValidateId()
+    {
+        $mock = $this->getMockBuilder(array('SessionHandlerInterface', 'SessionUpdateTimestampHandlerInterface'))->getMock();
+        $mock->expects($this->once())
+            ->method('validateId');
+
+        $proxy = new SessionHandlerProxy($mock);
+        $proxy->validateId('id');
+
+        $this->assertTrue($this->proxy->validateId('id'));
+    }
+
+    /**
+     * @requires PHPUnit 5.1
+     */
+    public function testUpdateTimestamp()
+    {
+        $mock = $this->getMockBuilder(array('SessionHandlerInterface', 'SessionUpdateTimestampHandlerInterface'))->getMock();
+        $mock->expects($this->once())
+            ->method('updateTimestamp');
+
+        $proxy = new SessionHandlerProxy($mock);
+        $proxy->updateTimestamp('id', 'data');
+
+        $this->mock->expects($this->once())
+            ->method('write');
+
+        $this->proxy->updateTimestamp('id', 'data');
+    }
 }