Handle tags and tasks move/duplication to another project

app/Model/TagDuplicationModel.php

@@ -0,0 +1,67 @@
+<?php
+
+namespace Kanboard\Model;
+
+use Kanboard\Core\Base;
+
+/**
+ * Tag Duplication
+ *
+ * @package  Kanboard\Model
+ * @author   Frederic Guillot
+ */
+class TagDuplicationModel extends Base
+{
+    /**
+     * Link tags to the new tasks
+     *
+     * @access public
+     * @param  integer $src_task_id
+     * @param  integer $dst_task_id
+     * @param  integer $dst_project_id
+     */
+    public function duplicateTaskTagsToAnotherProject($src_task_id, $dst_task_id, $dst_project_id)
+    {
+        $tags = $this->taskTagModel->getTagsByTask($src_task_id);
+
+        foreach ($tags as $tag) {
+            $tag_id = $this->tagModel->getIdByName($dst_project_id, $tag['name']);
+
+            if ($tag_id) {
+                $this->taskTagModel->associateTag($dst_task_id, $tag_id);
+            }
+        }
+    }
+
+    /**
+     * Duplicate tags to the new task
+     *
+     * @access public
+     * @param  integer $src_task_id
+     * @param  integer $dst_task_id
+     */
+    public function duplicateTaskTags($src_task_id, $dst_task_id)
+    {
+        $tags = $this->taskTagModel->getTagsByTask($src_task_id);
+
+        foreach ($tags as $tag) {
+            $this->taskTagModel->associateTag($dst_task_id, $tag['id']);
+        }
+    }
+
+    /**
+     * Remove tags that are not available in destination project
+     *
+     * @access public
+     * @param  integer $task_id
+     * @param  integer $dst_project_id
+     */
+    public function syncTaskTagsToAnotherProject($task_id, $dst_project_id)
+    {
+        $tag_ids = $this->taskTagModel->getTagIdsByTaskNotAvailableInProject($task_id, $dst_project_id);
+
+        foreach ($tag_ids as $tag_id) {
+            $this->taskTagModel->dissociateTag($task_id, $tag_id);
+        }
+    }
+}