feat: go-cqhttp style group file apis

src/onebot/action/go-cqhttp/GetGroupFilesByFolder.ts

@@ -0,0 +1,52 @@
+import { FromSchema, JSONSchema } from 'json-schema-to-ts';
+import BaseAction from '../BaseAction';
+import { ActionName } from '../types';
+import { NapCatOneBot11Adapter, OB11GroupFile } from '@/onebot';
+import { NapCatCore } from '@/core';
+import { GetGroupRootFiles } from '@/onebot/action/go-cqhttp/GetGroupRootFiles';
+import { OB11Entities } from '@/onebot/entities';
+
+const SchemaData = {
+    type: 'object',
+    properties: {
+        group_id: { type: ['string', 'number'] },
+        folder_id: { type: 'string' },
+    },
+    required: ['group_id', 'folder_id'],
+} as const satisfies JSONSchema;
+
+type Payload = FromSchema<typeof SchemaData>;
+
+export class GetGroupFilesByFolder extends BaseAction<Payload, {
+    files: OB11GroupFile[],
+    folders: [] // QQ does not allow nested folders
+}> {
+    actionName = ActionName.GoCQHTTP_GetGroupFilesByFolder;
+    payloadSchema = SchemaData;
+
+    constructor(obContext: NapCatOneBot11Adapter, core: NapCatCore,
+                private getGroupRootFilesImpl: GetGroupRootFiles) {
+        super(obContext, core);
+    }
+
+    async _handle(payload: Payload) {
+        const folder = (await this.getGroupRootFilesImpl._handle({ group_id: payload.group_id }))
+            .folders.find(folder => folder.folder_id === payload.folder_id);
+        if (!folder) {
+            throw new Error('Folder not found');
+        }
+        const ret = await this.core.apis.MsgApi.getGroupFileList(payload.group_id.toString(), {
+            sortType: 1,
+            fileCount: folder.total_file_count,
+            startIndex: 0,
+            sortOrder: 2,
+            showOnlinedocFolder: 0,
+            folderId: payload.folder_id,
+        }).catch(() => []);
+        return {
+            files: ret.filter(item => item.fileInfo)
+                .map(item => OB11Entities.file(item.peerId, item.fileInfo!)),
+            folders: [] as [],
+        };
+    }
+}