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diff --git a/vendor/symfony/serializer/Normalizer/DataUriNormalizer.php b/vendor/symfony/serializer/Normalizer/DataUriNormalizer.php
new file mode 100644
index 000000000..9e5af130d
--- /dev/null
+++ b/vendor/symfony/serializer/Normalizer/DataUriNormalizer.php
@@ -0,0 +1,154 @@
+<?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\Serializer\Normalizer;
+
+use Symfony\Component\HttpFoundation\File\File;
+use Symfony\Component\HttpFoundation\File\MimeType\MimeTypeGuesser;
+use Symfony\Component\HttpFoundation\File\MimeType\MimeTypeGuesserInterface;
+use Symfony\Component\Serializer\Exception\InvalidArgumentException;
+use Symfony\Component\Serializer\Exception\UnexpectedValueException;
+
+/**
+ * Normalizes an {@see \SplFileInfo} object to a data URI.
+ * Denormalizes a data URI to a {@see \SplFileObject} object.
+ *
+ * @author Kévin Dunglas <dunglas@gmail.com>
+ */
+class DataUriNormalizer implements NormalizerInterface, DenormalizerInterface
+{
+    /**
+     * @var MimeTypeGuesserInterface
+     */
+    private $mimeTypeGuesser;
+
+    public function __construct(MimeTypeGuesserInterface $mimeTypeGuesser = null)
+    {
+        if (null === $mimeTypeGuesser && class_exists('Symfony\Component\HttpFoundation\File\MimeType\MimeTypeGuesser')) {
+            $mimeTypeGuesser = MimeTypeGuesser::getInstance();
+        }
+
+        $this->mimeTypeGuesser = $mimeTypeGuesser;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function normalize($object, $format = null, array $context = array())
+    {
+        if (!$object instanceof \SplFileInfo) {
+            throw new InvalidArgumentException('The object must be an instance of "\SplFileInfo".');
+        }
+
+        $mimeType = $this->getMimeType($object);
+        $splFileObject = $this->extractSplFileObject($object);
+
+        $data = '';
+
+        $splFileObject->rewind();
+        while (!$splFileObject->eof()) {
+            $data .= $splFileObject->fgets();
+        }
+
+        if ('text' === explode('/', $mimeType, 2)[0]) {
+            return sprintf('data:%s,%s', $mimeType, rawurlencode($data));
+        }
+
+        return sprintf('data:%s;base64,%s', $mimeType, base64_encode($data));
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function supportsNormalization($data, $format = null)
+    {
+        return $data instanceof \SplFileInfo;
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * Regex adapted from Brian Grinstead code.
+     *
+     * @see https://gist.github.com/bgrins/6194623
+     */
+    public function denormalize($data, $class, $format = null, array $context = array())
+    {
+        if (!preg_match('/^data:([a-z0-9][a-z0-9\!\#\$\&\-\^\_\+\.]{0,126}\/[a-z0-9][a-z0-9\!\#\$\&\-\^\_\+\.]{0,126}(;[a-z0-9\-]+\=[a-z0-9\-]+)?)?(;base64)?,[a-z0-9\!\$\&\\\'\,\(\)\*\+\,\;\=\-\.\_\~\:\@\/\?\%\s]*\s*$/i', $data)) {
+            throw new UnexpectedValueException('The provided "data:" URI is not valid.');
+        }
+
+        try {
+            switch ($class) {
+                case 'Symfony\Component\HttpFoundation\File\File':
+                    return new File($data, false);
+
+                case 'SplFileObject':
+                case 'SplFileInfo':
+                    return new \SplFileObject($data);
+            }
+        } catch (\RuntimeException $exception) {
+            throw new UnexpectedValueException($exception->getMessage(), $exception->getCode(), $exception);
+        }
+
+        throw new InvalidArgumentException(sprintf('The class parameter "%s" is not supported. It must be one of "SplFileInfo", "SplFileObject" or "Symfony\Component\HttpFoundation\File\File".', $class));
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function supportsDenormalization($data, $type, $format = null)
+    {
+        $supportedTypes = array(
+            \SplFileInfo::class => true,
+            \SplFileObject::class => true,
+            'Symfony\Component\HttpFoundation\File\File' => true,
+        );
+
+        return isset($supportedTypes[$type]);
+    }
+
+    /**
+     * Gets the mime type of the object. Defaults to application/octet-stream.
+     *
+     * @param \SplFileInfo $object
+     *
+     * @return string
+     */
+    private function getMimeType(\SplFileInfo $object)
+    {
+        if ($object instanceof File) {
+            return $object->getMimeType();
+        }
+
+        if ($this->mimeTypeGuesser && $mimeType = $this->mimeTypeGuesser->guess($object->getPathname())) {
+            return $mimeType;
+        }
+
+        return 'application/octet-stream';
+    }
+
+    /**
+     * Returns the \SplFileObject instance associated with the given \SplFileInfo instance.
+     *
+     * @param \SplFileInfo $object
+     *
+     * @return \SplFileObject
+     */
+    private function extractSplFileObject(\SplFileInfo $object)
+    {
+        if ($object instanceof \SplFileObject) {
+            return $object;
+        }
+
+        return $object->openFile();
+    }
+}