merged branch jfcixmedia/2.1 (PR #5838)

This PR was squashed before being merged into the master branch (closes #5838).

Commits
-------

201f3e6 [Form] Fixed cannot unset string offsets in CsrfValidationListener

Discussion
----------

[Form] Fixed cannot unset string offsets in CsrfValidationListener

Bug fix: yes
Feature addition: no
Backwards compatibility break: no
Symfony2 tests pass: yes
Fixes the following tickets: -
Todo: -
License of the code: MIT
Documentation PR: -

A php fatal error is happening when someone rewrite the entire form data for an object with a single input.
```
Fatal error: Cannot unset string offsets in vendor/symfony/symfony/src/Symfony/Component/Form/Extension/Csrf/EventListener/CsrfValidationListener.php on line 72
```

Example:

```html
<form action="/app_dev.php/post/create" method="post" >
    <div id="posttype">
        <div>
            <label for="posttype_name" class="required">Name</label>
            <input type="text" id="posttype_name" name="posttype[name]" required="required" maxlength="255" />
        </div>
        <div>
            <label for="posttype_text" class="required">Text</label>
            <textarea id="posttype_text" name="posttype[text]" required="required"></textarea>
        </div>
        <input type="hidden" id="posttype__token" name="posttype[_token]" value="83a1617c694fbdea43c2527f1a55c7419ce82a42" /></div>
        <p>
            <button type="submit">Create</button>
        </p>
</form>
```

If someone alters the html to add a simple input at the bottom of the form like this one:
```html
<input type="text" id="posttype" name="posttype" value="test123" />
```

The result will be a php fatal error.

---------------------------------------------------------------------------

by bschussek at 2012-10-26T09:49:05Z

Thank you for the pull request! Could you please reference the pull request in the test?

```php
// https://github.com/symfony/symfony/pull/5838
public function testStringFormData()
{
    ...
```

---------------------------------------------------------------------------

by jfcixmedia at 2012-10-26T10:21:29Z

@bschussek  Added, thanks.

src/Symfony/Component/Form/Extension/Csrf/EventListener/CsrfValidationListener.php

@@ -68,7 +68,9 @@ class CsrfValidationListener implements EventSubscriberInterface
                 $form->addError(new FormError('The CSRF token is invalid. Please try to resubmit the form.'));
             }
 
-            unset($data[$this->fieldName]);
+            if (is_array($data)) {
+                unset($data[$this->fieldName]);
+            }
         }
 
         $event->setData($data);

src/Symfony/Component/Form/Tests/Extension/Csrf/EventListener/CsrfValidationListenerTest.php

@@ -0,0 +1,78 @@
+<?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\Form\Tests\Extension\Csrf\EventListener;
+
+use Symfony\Component\Form\FormEvent;
+use Symfony\Component\Form\FormBuilder;
+use Symfony\Component\Form\Extension\Csrf\EventListener\CsrfValidationListener;
+
+class CsrfValidationListenerTest extends \PHPUnit_Framework_TestCase
+{
+    protected $dispatcher;
+    protected $factory;
+    protected $csrfProvider;
+
+    protected function setUp()
+    {
+        if (!class_exists('Symfony\Component\EventDispatcher\EventDispatcher')) {
+            $this->markTestSkipped('The "EventDispatcher" component is not available');
+        }
+
+        $this->dispatcher = $this->getMock('Symfony\Component\EventDispatcher\EventDispatcherInterface');
+        $this->factory = $this->getMock('Symfony\Component\Form\FormFactoryInterface');
+        $this->csrfProvider = $this->getMock('Symfony\Component\Form\Extension\Csrf\CsrfProvider\CsrfProviderInterface');
+        $this->form = $this->getBuilder('post')
+            ->setDataMapper($this->getDataMapper())
+            ->getForm();
+    }
+
+    protected function tearDown()
+    {
+        $this->dispatcher = null;
+        $this->factory = null;
+        $this->csrfProvider = null;
+        $this->form = null;
+    }
+
+    protected function getBuilder($name = 'name')
+    {
+        return new FormBuilder($name, null, $this->dispatcher, $this->factory, array('compound' => true));
+    }
+
+    protected function getForm($name = 'name')
+    {
+        return $this->getBuilder($name)->getForm();
+    }
+
+    protected function getDataMapper()
+    {
+        return $this->getMock('Symfony\Component\Form\DataMapperInterface');
+    }
+
+    protected function getMockForm()
+    {
+        return $this->getMock('Symfony\Component\Form\Tests\FormInterface');
+    }
+
+    // https://github.com/symfony/symfony/pull/5838
+    public function testStringFormData()
+    {
+        $data = "XP4HUzmHPi";
+        $event = new FormEvent($this->form, $data);
+
+        $validation = new CsrfValidationListener('csrf', $this->csrfProvider, 'unknown');
+        $validation->preBind($event);
+
+        // Validate accordingly
+        $this->assertSame($data, $event->getData());
+    }
+}