Support exporting calendar events

Also update Deno and libraries

routes/api/calendar/get-events.tsx

@@ -0,0 +1,38 @@
+import { Handlers } from 'fresh/server.ts';
+
+import { CalendarEvent, FreshContextState } from '/lib/types.ts';
+import { getCalendarEvents } from '/lib/data/calendar.ts';
+
+interface Data {}
+
+export interface RequestBody {
+  calendarIds: string[];
+}
+
+export interface ResponseBody {
+  success: boolean;
+  calendarEvents: CalendarEvent[];
+}
+
+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.calendarIds) {
+      return new Response('Bad Request', { status: 400 });
+    }
+
+    const calendarEvents = await getCalendarEvents(
+      context.state.user.id,
+      requestBody.calendarIds,
+    );
+
+    const responseBody: ResponseBody = { success: true, calendarEvents };
+
+    return new Response(JSON.stringify(responseBody));
+  },
+};