Move API calls for task metadata to a separate class

app/Api/Procedure/TaskMetadataProcedure.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace Kanboard\Api\Procedure;
+
+use Kanboard\Api\Authorization\TaskAuthorization;
+
+/**
+ * Class TaskMetadataProcedure
+ *
+ * @package Kanboard\Api\Procedure
+ * @author  Frederic Guillot
+ */
+class TaskMetadataProcedure extends BaseProcedure
+{
+    public function getTaskMetadata($task_id)
+    {
+        TaskAuthorization::getInstance($this->container)->check($this->getClassName(), 'getTask', $task_id);
+        return $this->taskMetadataModel->getAll($task_id);
+    }
+
+    public function getTaskMetadataByName($task_id, $name)
+    {
+        TaskAuthorization::getInstance($this->container)->check($this->getClassName(), 'getTask', $task_id);
+        return $this->taskMetadataModel->get($task_id, $name);
+    }
+
+    public function saveTaskMetadata($task_id, array $values)
+    {
+        TaskAuthorization::getInstance($this->container)->check($this->getClassName(), 'updateTask', $task_id);
+        return $this->taskMetadataModel->save($task_id, $values);
+    }
+
+    public function removeTaskMetadata($task_id, $name)
+    {
+        TaskAuthorization::getInstance($this->container)->check($this->getClassName(), 'updateTask', $task_id);
+        return $this->taskMetadataModel->remove($task_id, $name);
+    }
+}