feat: implement PublishableItemTypeChecker to check if type is publis…

…hable (#548)

src/itemPublished/itemPublished.test.ts

@@ -0,0 +1,34 @@
+import { describe, expect, it } from 'vitest';
+
+import { PublishableItemTypeChecker } from './itemPublished.js';
+import { ItemType } from '@/item/itemType.js';
+
+describe('ItemPublished', () => {
+  describe('PublishableItemTypeChecker', () => {
+    describe('Authorized item types to be published', () => {
+      it('"Folder" type is allowed to be published', () => {
+        expect(
+          PublishableItemTypeChecker.isItemTypeAllowedToBePublished(
+            ItemType.FOLDER,
+          ),
+        ).toBeTruthy();
+      });
+    });
+
+    describe('Unauthorized item types to be published', () => {
+      const unauthorizedTypes = Object.values(ItemType).filter(
+        (t) => !PublishableItemTypeChecker.isItemTypeAllowedToBePublished(t),
+      );
+
+      it.each(unauthorizedTypes)(
+        'Item type "%s" is not allowed to be published',
+        (type) => {
+          expect(unauthorizedTypes).includes(type);
+          expect(
+            PublishableItemTypeChecker.isItemTypeAllowedToBePublished(type),
+          ).toBeFalsy();
+        },
+      );
+    });
+  });
+});

src/itemPublished/itemPublished.ts

@@ -1,4 +1,10 @@
-import { DiscriminatedItem, Member, PackedItem } from '../index.js';
+import {
+  DiscriminatedItem,
+  ItemType,
+  ItemTypeUnion,
+  Member,
+  PackedItem,
+} from '../index.js';
 import { UUID } from '@/types.js';
 
 export interface ItemPublished {
@@ -16,3 +22,19 @@ export interface PackedItemPublished {
   item: PackedItem;
   totalViews: number;
 }
+
+export class PublishableItemTypeChecker {
+  private static readonly ALLOWED_PUBLISHING_TYPES: ItemTypeUnion[] = [
+    ItemType.FOLDER,
+  ];
+
+  public static isItemTypeAllowedToBePublished(itemType: ItemTypeUnion) {
+    return PublishableItemTypeChecker.ALLOWED_PUBLISHING_TYPES.includes(
+      itemType,
+    );
+  }
+
+  public static getAllowedTypes() {
+    return Array.from(PublishableItemTypeChecker.ALLOWED_PUBLISHING_TYPES);
+  }
+}