[HttpFoundation] Prepare to split out session handler callback from session storage.

src/Symfony/Component/HttpFoundation/Session/Storage/Handler/NativeSessionHandler.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\HttpFoundation\Session\Storage\Handler;
+
+/**
+ * Adds SessionHandler functionality if available.
+ *
+ * @see http://php.net/sessionhandler
+ */
+
+if (version_compare(phpversion(), '5.4.0', '>=')) {
+    class NativeSessionHandler extends \SessionHandler {}
+} else {
+    class NativeSessionHandler {}
+}

src/Symfony/Component/HttpFoundation/Session/Storage/Proxy/AbstractProxy.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\HttpFoundation\Session\Storage\Proxy;
+
+/**
+ * AbstractProxy.
+ */
+abstract class AbstractProxy
+{
+    /**
+     * Flag if handler wraps an internal PHP session handler (using \SessionHandler).
+     *
+     * @var boolean
+     */
+    protected $wrapper = false;
+
+    /**
+     * @var boolean
+     */
+    protected $active = false;
+
+    /**
+     * @var string
+     */
+    protected $saveHandlerName;
+
+    /**
+     * Gets the session.save_handler name.
+     *
+     * @return string
+     */
+    public function getSaveHandlerName()
+    {
+        return $this->saveHandlerName;
+    }
+
+    public function isSessionHandlerInterface()
+    {
+        return (bool)($this instanceof \SessionHandlerInterface);
+    }
+
+    /**
+     * Returns true if this handler wraps an internal PHP session save handler using \SessionHandler.
+     *
+     * @return bool
+     */
+    public function isWrapper()
+    {
+        return $this->wrapper;
+    }
+
+    /**
+     * Has a session started?
+     *
+     * @return bool
+     */
+    public function isActive()
+    {
+        return $this->active;
+    }
+
+    /**
+     * Sets the active flag.
+     *
+     * @param bool $flag
+     */
+    public function setActive($flag)
+    {
+        $this->active = (bool)$flag;
+    }
+}

src/Symfony/Component/HttpFoundation/Session/Storage/Proxy/NativeProxy.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\HttpFoundation\Session\Storage\Proxy;
+
+/**
+ * NativeProxy.
+ *
+ * This proxy is built-in session handlers in PHP 5.3.x
+ */
+class NativeProxy extends AbstractProxy
+{
+    /**
+     * Constructor.
+     *
+     * @param $handler
+     */
+    public function __construct($handler)
+    {
+        if (version_compare(phpversion(), '5.4.0', '>=') && $handler instanceof \SessionHandlerInterface) {
+            throw new \InvalidArgumentException('This proxy is only for PHP 5.3 and not for instances of \SessionHandler or \SessionHandlerInterface');
+        }
+        
+        $this->handler = $handler;
+        $this->saveHandlerName = ini_get('session.save_handler');
+    }
+
+    /**
+     * Returns true if this handler wraps an internal PHP session save handler using \SessionHandler.
+     *
+     * @return bool False.
+     */
+    public function isWrapper()
+    {
+        return false;
+    }
+}

src/Symfony/Component/HttpFoundation/Session/Storage/Proxy/SessionHandlerProxy.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\HttpFoundation\Session\Storage\Proxy;
+
+/**
+ * SessionHandler proxy.
+ */
+class SessionHandlerProxy extends AbstractProxy implements \SessionHandlerInterface
+{
+    /**
+     * @var \SessionHandlerInterface
+     */
+    protected $handler;
+
+    /**
+     * Constructor.
+     *
+     * @param \SessionHandlerInterface $handler
+     */
+    public function __construct(\SessionHandlerInterface $handler)
+    {
+        $this->handler = $handler;
+        $this->wrapper = (bool)(class_exists('SessionHandler') && $handler instanceof \SessionHandler);
+        $this->saveHandlerName = $this->wrapper ? ini_get('session.save_handler') : 'user';
+    }
+
+    // \SessionHandlerInterface
+
+    /**
+     * {@inheritdoc}
+     */
+    function open($savePath, $sessionName)
+    {
+        $return = (bool)$this->handler->open($savePath, $sessionName);
+
+        if (true === $return) {
+            $this->active = true;
+        }
+
+        return $return;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    function close()
+    {
+        $this->active = false;
+
+        return (bool)$this->handler->close();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    function read($id)
+    {
+        return (string)$this->handler->read($id);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    function write($id, $data)
+    {
+        return (bool)$this->handler->write($id, $data);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    function destroy($id)
+    {
+        return (bool)$this->handler->destroy($id);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    function gc($maxlifetime)
+    {
+        return (bool)$this->handler->gc($maxlifetime);
+    }
+}