fixes #253

lib/classes/JsonApi/Routes/Courseware/StructuralElementsUpdate.php

@@ -119,6 +119,9 @@ class StructuralElementsUpdate extends JsonApiController
                 }
             }
 
+            $resource->release_date = $json['data']['attributes']['release-date'];
+            $resource->withdraw_date = $json['data']['attributes']['withdraw-date'];
+
             // update parent
             if (self::arrayHas($json, 'data.relationships.parent')) {
                 $parent = $this->getParentFromJson($json);

lib/models/Courseware/StructuralElement.php

@@ -238,6 +238,10 @@ class StructuralElement extends \SimpleORMap
             return true;
         }
 
+        if (!$this->releasedForReaders($this)) {
+            return false;
+        }
+
         if (!count($this->read_approval)) {
             return $this->canReadSequential($user);
         }
@@ -282,6 +286,30 @@ class StructuralElement extends \SimpleORMap
         return $this->previousProgressAchieved($user);
     }
 
+    /**
+     * @return bool true if the user may read this instance in time interval
+     *
+     * @SuppressWarnings(PHPMD.Superglobals)
+     */
+    private function releasedForReaders(StructuralElement $element): bool
+    {
+        $released = false;
+        if (!$element->release_date || $element->release_date <= time()) {
+            $released = true;
+        }
+
+        if ($element->withdraw_date && $element->withdraw_date <= time()) {
+            $released = false;
+        }
+
+        $parent_released = true;
+        if (!$element->isRootNode()) {
+            $parent_released = $this->releasedForReaders($element->parent);
+        }
+
+        return $released && $parent_released;
+    }
+
     /**
      * @param mixed $user the user to validate
      *

resources/vue/components/courseware/CoursewareToolsContents.vue

@@ -50,14 +50,16 @@ export default {
             for (var i = 0; i < data.length; i++) {
                 if (data[i].relationships.parent.data?.id == parentId) {
                     let new_childs = this.loadChildren(data[i].id, data, depth + 1);
-                    children.push({
-                        name: data[i].attributes.title,
-                        position: data[i].attributes.position,
-                        element_id: data[i].id,
-                        children: new_childs,
-                        depth: depth,
-                        current: this.currentElementId === data[i].id
-                    });
+                    if (data[i].attributes['can-read']) {
+                        children.push({
+                            name: data[i].attributes.title,
+                            position: data[i].attributes.position,
+                            element_id: data[i].id,
+                            children: new_childs,
+                            depth: depth,
+                            current: this.currentElementId === data[i].id
+                        });
+                    }
                 }
             }