Course: Fix export mbz validation, root-only resources, skip empty folders - refs BT#21977

main/inc/lib/moodleexport/FolderExport.php

@@ -42,19 +42,26 @@ class FolderExport extends ActivityExport
     /**
      * Get folder data dynamically from the course.
      */
-    public function getData(int $folderId, int $sectionId): array
+    public function getData(int $folderId, int $sectionId): ?array
     {
         $folder = $this->course->resources['document'][$folderId];
 
-        return [
-            'id' => $folderId,
-            'moduleid' => $folder->source_id,
-            'modulename' => 'folder',
-            'contextid' => $folder->source_id,
-            'name' => $folder->title,
-            'sectionid' => $sectionId,
-            'timemodified' => time(),
-        ];
+        $folderPath = $folder->path . '/';
+        foreach ($this->course->resources['document'] as $resource) {
+            if ($resource->path !== $folder->path && str_starts_with($resource->path, $folderPath)) {
+                return [
+                    'id' => $folderId,
+                    'moduleid' => $folder->source_id,
+                    'modulename' => 'folder',
+                    'contextid' => $folder->source_id,
+                    'name' => $folder->title,
+                    'sectionid' => $sectionId,
+                    'timemodified' => time(),
+                ];
+            }
+        }
+
+        return null;
     }
 
     /**

main/inc/lib/moodleexport/MoodleExport.php

@@ -404,15 +404,33 @@ class MoodleExport
                         $id = $resource->source_id;
                         $title = $document['title'];
                     } elseif ('file' === $resource->file_type) {
-                        $exportClass = ResourceExport::class;
-                        $moduleName = 'resource';
-                        $id = $resource->source_id;
-                        $title = $resource->title;
+                        $isRoot = substr_count($resource->path, '/') === 1;
+
+                        if ($isRoot) {
+                            $exportClass = ResourceExport::class;
+                            $moduleName = 'resource';
+                            $id = $resource->source_id;
+                            $title = $resource->title;
+                        }
                     } elseif ('folder' === $resource->file_type) {
-                        $exportClass = FolderExport::class;
-                        $moduleName = 'folder';
-                        $id = $resource->source_id;
-                        $title = $resource->title;
+                        $isEmpty = true;
+                        $folderPath = $resource->path . '/';
+
+                        foreach ($this->course->resources['document'] as $childResource) {
+                            if (str_starts_with($childResource->path, $folderPath) && $childResource->path !== $resource->path) {
+                                $isEmpty = false;
+                                break;
+                            }
+                        }
+
+                        $isRoot = substr_count($resource->path, '/') === 1;
+
+                        if (!$isEmpty && $isRoot) {
+                            $exportClass = FolderExport::class;
+                            $moduleName = 'folder';
+                            $id = $resource->source_id;
+                            $title = $resource->title;
+                        }
                     }
                 }
                 // Handle assignments (work)