Add support for child users adding limits themself

src/util/category.ts

@@ -0,0 +1,40 @@
+/*
+ * server component for the TimeLimit App
+ * Copyright (C) 2019 - 2020 Jonas Lochmann
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, version 3 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+export function getCategoryWithParentCategories (categories: Array<{ categoryId: string, parentCategoryId: string }>, startCategoryId: string): Array<string> {
+  const categoryById = new Map<string, { categoryId: string, parentCategoryId: string }>()
+
+  categories.forEach((category) => categoryById.set(category.categoryId, category))
+
+  const startCategory = categoryById.get(startCategoryId)
+
+  if (!startCategory) {
+    throw new Error('start category not found')
+  }
+
+  const categoryIds = [ startCategoryId ]
+
+  let currentCategory = categoryById.get(startCategory.parentCategoryId)
+
+  while (currentCategory !== undefined && categoryIds.indexOf(currentCategory.categoryId) === -1) {
+    categoryIds.push(currentCategory.categoryId)
+
+    currentCategory = categoryById.get(currentCategory.parentCategoryId)
+  }
+
+  return categoryIds
+}