Actualización

vendor/gedmo/doctrine-extensions/lib/Gedmo/Uploadable/FilenameGenerator/FilenameGeneratorAlphanumeric.php

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+<?php
+
+namespace Gedmo\Uploadable\FilenameGenerator;
+
+/**
+ * FilenameGeneratorAlphanumeric
+ *
+ * This class generates a filename, leaving only lowercase
+ * alphanumeric characters
+ *
+ * @author Gustavo Falco <comfortablynumb84@gmail.com>
+ * @author Gediminas Morkevicius <gediminas.morkevicius@gmail.com>
+ * @license MIT License (http://www.opensource.org/licenses/mit-license.php)
+ */
+
+class FilenameGeneratorAlphanumeric implements FilenameGeneratorInterface
+{
+    /**
+     * @inheritDoc
+     */
+    public static function generate($filename, $extension, $object = null)
+    {
+        return preg_replace('/[^a-z0-9]+/', '-', strtolower($filename)).$extension;
+    }
+}

vendor/gedmo/doctrine-extensions/lib/Gedmo/Uploadable/FilenameGenerator/FilenameGeneratorInterface.php

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+<?php
+
+namespace Gedmo\Uploadable\FilenameGenerator;
+
+/**
+ * FilenameGeneratorInterface
+ *
+ * @author Gustavo Falco <comfortablynumb84@gmail.com>
+ * @author Gediminas Morkevicius <gediminas.morkevicius@gmail.com>
+ * @license MIT License (http://www.opensource.org/licenses/mit-license.php)
+ */
+
+interface FilenameGeneratorInterface
+{
+    /**
+     * Generates a new filename
+     *
+     * @param string - Filename without extension
+     * @param string - Extension with dot: .jpg, .gif, etc
+     * @param $object
+     *
+     * @return string
+     */
+    public static function generate($filename, $extension, $object = null);
+}

vendor/gedmo/doctrine-extensions/lib/Gedmo/Uploadable/FilenameGenerator/FilenameGeneratorSha1.php

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+<?php
+
+namespace Gedmo\Uploadable\FilenameGenerator;
+
+/**
+ * FilenameGeneratorSha1
+ *
+ * @author Gustavo Falco <comfortablynumb84@gmail.com>
+ * @author Gediminas Morkevicius <gediminas.morkevicius@gmail.com>
+ * @license MIT License (http://www.opensource.org/licenses/mit-license.php)
+ */
+
+class FilenameGeneratorSha1 implements FilenameGeneratorInterface
+{
+    /**
+     * @inheritDoc
+     */
+    public static function generate($filename, $extension, $object = null)
+    {
+        return sha1(uniqid($filename.$extension, true)).$extension;
+    }
+}