WIP: FEATURE: SS4 Upgrade

src/Controller/SurveyUserDefinedFormController.php

+<?php
+
+namespace ThunderCats\UserSurveys\Controller;
+
+use SilverStripe\Control\HTTPRequest;
+use SilverStripe\ORM\FieldType\DBField;
+use SilverStripe\ORM\FieldType\DBHTMLText;
+use SilverStripe\UserForms\Control\UserDefinedFormController;
+
+class SurveyUserDefinedFormController extends UserDefinedFormController
+{
+    private static $allowed_actions = array(
+        'index',
+        'ping',
+        'Form',
+        'finished',
+    );
+
+    /**
+     * Using $SurveyUserDefinedForm in the Content area of the page shows
+     * where the form should be rendered into. If it does not exist
+     * then default back to $Form.
+     *
+     * @return array
+     */
+    public function index(HTTPRequest $request = null)
+    {
+        if ($this->Content && $form = $this->Form()) {
+            $hasLocation = stristr($this->Content, '$SurveyUserDefinedForm');
+            if ($hasLocation) {
+                $content = preg_replace('/(<p[^>]*>)?\\$SurveyUserDefinedForm(<\\/p>)?/i', $form->forTemplate(), $this->Content);
+
+                return array(
+                    'Content' => DBField::create_field(DBHTMLText::class, $content),
+                    'Form' => '',
+                );
+            }
+        }
+
+        return array(
+            'Content' => DBField::create_field(DBHTMLText::class, $this->Content),
+            'Form' => $this->Form(),
+        );
+    }
+
+    /**
+     * Get the form for the page. Form can be modified by calling {@link updateForm()}
+     * on a UserDefinedForm extension.
+     *
+     * @return Forms
+     */
+    public function Form()
+    {
+        return null;
+    }
+}