Add file procedures to the API

app/Api/File.php

@@ -0,0 +1,48 @@
+<?php
+
+namespace Api;
+
+/**
+ * File API controller
+ *
+ * @package  api
+ * @author   Frederic Guillot
+ */
+class File extends Base
+{
+    public function getFile($file_id)
+    {
+        return $this->file->getById($file_id);
+    }
+
+    public function getAllFiles($task_id)
+    {
+        return $this->file->getAll($task_id);
+    }
+
+    public function downloadFile($file_id)
+    {
+        $file = $this->file->getById($file_id);
+
+        if (! empty($file)) {
+
+            $filename = FILES_DIR.$file['path'];
+
+            if (file_exists($filename)) {
+                return base64_encode(file_get_contents($filename));
+            }
+        }
+
+        return '';
+    }
+
+    public function createFile($project_id, $task_id, $filename, $is_image, &$blob)
+    {
+        return $this->file->uploadContent($project_id, $task_id, $filename, $is_image, $blob);
+    }
+
+    public function removeFile($file_id)
+    {
+        return $this->file->remove($file_id);
+    }
+}