Merge pull request #150 from Kunstmaan/feature/add-svg-support

Implement simple SVG mime type guesser

Helper/File/FileHandler.php

@@ -42,6 +42,7 @@ public function __construct()
     {
         $this->mimeTypeGuesser = MimeTypeGuesser::getInstance();
         $this->mimeTypeGuesser->register(new FileBinaryMimeTypeGuesser());
+        $this->mimeTypeGuesser->register(new SVGMimeTypeGuesser());
     }
 
     /**

Helper/File/SVGMimeTypeGuesser.php

@@ -0,0 +1,71 @@
+<?php
+/**
+ * Created by Kunstmaan.
+ * Date: 25/06/14
+ * Time: 09:28
+ */
+
+namespace Kunstmaan\MediaBundle\Helper\File;
+
+use Symfony\Component\HttpFoundation\File\MimeType\MimeTypeGuesserInterface;
+use Symfony\Component\HttpFoundation\File\Exception\FileNotFoundException;
+use Symfony\Component\HttpFoundation\File\Exception\AccessDeniedException;
+use Symfony\Component\Validator\Constraints\NotBlank;
+use Symfony\Component\Validator\Constraints\Type;
+
+/**
+ * SVGMimeTypeGuesser
+ *
+ * Simple Mime type guesser to detect SVG image files, it will test if the file is an XML file and return SVG mime type
+ * if the XML contains a valid SVG namespace...
+ *
+ * @package Kunstmaan\MediaBundle\Helper\File
+ */
+class SVGMimeTypeGuesser implements MimeTypeGuesserInterface
+{
+    private $_MIMETYPE_NAMESPACES = array(
+        'http://www.w3.org/2000/svg' => 'image/svg+xml'
+    );
+
+    /**
+     * Returns whether this guesser is supported on the current OS
+     *
+     * @return bool
+     */
+    public static function isSupported()
+    {
+        return class_exists('DOMDocument') && class_exists('DOMXPath');
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function guess($path)
+    {
+        if (!is_file($path)) {
+            throw new FileNotFoundException($path);
+        }
+
+        if (!is_readable($path)) {
+            throw new AccessDeniedException($path);
+        }
+
+        if (!self::isSupported()) {
+            return;
+        }
+
+        $dom = new \DOMDocument();
+        $xml = $dom->load($path, LIBXML_NOERROR + LIBXML_ERR_FATAL + LIBXML_ERR_NONE);
+        if ($xml === false) {
+            return;
+        }
+        $xpath = new \DOMXPath($dom);
+        foreach ($xpath->query('namespace::*') as $node) {
+            if (isset($this->_MIMETYPE_NAMESPACES[$node->nodeValue])) {
+                return $this->_MIMETYPE_NAMESPACES[$node->nodeValue];
+            }
+        }
+
+        return;
+    }
+}