Extracted page copy to new cloner class

Fundemental refactor for planned additional clone operations.
No behaviour change intended in this commit.

app/Entities/Tools/Cloner.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace BookStack\Entities\Tools;
+
+use BookStack\Entities\Models\Entity;
+use BookStack\Entities\Models\Page;
+use BookStack\Entities\Repos\PageRepo;
+
+class Cloner
+{
+
+    /**
+     * @var PageRepo
+     */
+    protected $pageRepo;
+
+    public function __construct(PageRepo $pageRepo)
+    {
+        $this->pageRepo = $pageRepo;
+    }
+
+    /**
+     * Clone the given page into the given parent using the provided name.
+     */
+    public function clonePage(Page $original, Entity $parent, string $newName): Page
+    {
+        $copyPage = $this->pageRepo->getNewDraftPage($parent);
+        $pageData = $original->getAttributes();
+
+        // Update name
+        $pageData['name'] = $newName;
+
+        // Copy tags from previous page if set
+        if ($original->tags) {
+            $pageData['tags'] = [];
+            foreach ($original->tags as $tag) {
+                $pageData['tags'][] = ['name' => $tag->name, 'value' => $tag->value];
+            }
+        }
+
+        return $this->pageRepo->publishDraft($copyPage, $pageData);
+    }
+
+}