Add new API endpoint to get a list of files for a given directory.

routes/api/files/get.tsx

@@ -0,0 +1,40 @@
+import { Handlers } from 'fresh/server.ts';
+
+import { DirectoryFile, FreshContextState } from '/lib/types.ts';
+import { getFiles } from '/lib/data/files.ts';
+
+interface Data {}
+
+export interface RequestBody {
+  parentPath: string;
+}
+
+export interface ResponseBody {
+  success: boolean;
+  files: DirectoryFile[];
+}
+
+export const handler: Handlers<Data, FreshContextState> = {
+  async POST(request, context) {
+    if (!context.state.user) {
+      return new Response('Unauthorized', { status: 401 });
+    }
+
+    const requestBody = await request.clone().json() as RequestBody;
+
+    if (
+      !requestBody.parentPath || !requestBody.parentPath.startsWith('/') || requestBody.parentPath.includes('../')
+    ) {
+      return new Response('Bad Request', { status: 400 });
+    }
+
+    const files = await getFiles(
+      context.state.user.id,
+      requestBody.parentPath,
+    );
+
+    const responseBody: ResponseBody = { success: true, files };
+
+    return new Response(JSON.stringify(responseBody));
+  },
+};