32913 set url key for page before validation

Author: silinmykola

app/code/Magento/Cms/Model/Plugin/PageRepository/ValidationCompositePlugin.php

@@ -0,0 +1,46 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+namespace Magento\Cms\Model\Plugin\PageRepository;
+
+use Magento\Cms\Api\Data\PageInterface;
+use Magento\Cms\Model\PageRepository\ValidationComposite;
+use Magento\CmsUrlRewrite\Model\CmsPageUrlPathGenerator;
+
+/**
+ * Generate url_key if the merchant didn't fill this field
+ */
+class ValidationCompositePlugin
+{
+    /**
+     * @var CmsPageUrlPathGenerator
+     */
+    private $cmsPageUrlPathGenerator;
+
+    /**
+     * @param CmsPageUrlPathGenerator $cmsPageUrlPathGenerator
+     */
+    public function __construct(
+        CmsPageUrlPathGenerator $cmsPageUrlPathGenerator
+    ) {
+        $this->cmsPageUrlPathGenerator = $cmsPageUrlPathGenerator;
+    }
+
+    /**
+     * Before save handler
+     *
+     * @param ValidationComposite $subject
+     * @param PageInterface $page
+     */
+    public function beforeSave(
+        ValidationComposite $subject,
+        PageInterface $page
+    ) {
+        $urlKey = $page->getData('identifier');
+        if ($urlKey === '' || $urlKey === null) {
+            $page->setData('identifier', $this->cmsPageUrlPathGenerator->generateUrlKey($page));
+        }
+    }
+}

app/code/Magento/Cms/etc/di.xml

@@ -229,6 +229,9 @@
     <type name="Magento\Catalog\Model\Product">
         <plugin name="cms" type="Magento\Cms\Model\Plugin\Product" sortOrder="100"/>
     </type>
+    <type name="Magento\Cms\Model\PageRepository\ValidationComposite">
+        <plugin name="cms_validate_url_plugin" type="Magento\Cms\Model\Plugin\PageRepository\ValidationCompositePlugin" sortOrder="10"/>
+    </type>
     <type name="Magento\Cms\Model\PageRepository\ValidationComposite">
         <arguments>
             <argument name="repository" xsi:type="object">Magento\Cms\Model\PageRepository</argument>