Add abstract storage layer

app/Core/ObjectStorage/ObjectStorageInterface.php

@@ -0,0 +1,68 @@
+<?php
+
+namespace Core\ObjectStorage;
+
+/**
+ * Object Storage Interface
+ *
+ * @package  ObjectStorage
+ * @author   Frederic Guillot
+ */
+interface ObjectStorageInterface
+{
+    /**
+     * Fetch object contents
+     *
+     * @access public
+     * @param  string  $key
+     * @return string
+     */
+    public function get($key);
+
+    /**
+     * Save object
+     *
+     * @access public
+     * @param  string  $key
+     * @param  string  $blob
+     * @return string
+     */
+    public function put($key, &$blob);
+
+    /**
+     * Output directly object content
+     *
+     * @access public
+     * @param  string  $key
+     */
+    public function passthru($key);
+
+    /**
+     * Move local file to object storage
+     *
+     * @access public
+     * @param  string  $filename
+     * @param  string  $key
+     * @return boolean
+     */
+    public function moveFile($filename, $key);
+
+    /**
+     * Move uploaded file to object storage
+     *
+     * @access public
+     * @param  string  $filename
+     * @param  string  $key
+     * @return boolean
+     */
+    public function moveUploadedFile($filename, $key);
+
+    /**
+     * Remove object
+     *
+     * @access public
+     * @param  string  $key
+     * @return boolean
+     */
+    public function remove($key);
+}