misskey/src/server/api/endpoints/aggregation/users.ts

import $ from 'cafy';
import User from '../../../../models/user';

/**
 * Aggregate users
 */
export default (params: any) => new Promise(async (res, rej) => {
	// Get 'limit' parameter
	const [limit = 365, limitErr] = $.num.optional.range(1, 365).get(params.limit);
	if (limitErr) return rej('invalid limit param');

	const users = await User
		.find({}, {
			sort: {
				_id: -1
			},
			fields: {
				_id: false,
				createdAt: true,
				deletedAt: true
			}
		});

	const graph = [];

	for (let i = 0; i < limit; i++) {
		let dayStart = new Date(new Date().setDate(new Date().getDate() - i));
		dayStart = new Date(dayStart.setMilliseconds(0));
		dayStart = new Date(dayStart.setSeconds(0));
		dayStart = new Date(dayStart.setMinutes(0));
		dayStart = new Date(dayStart.setHours(0));

		let dayEnd = new Date(new Date().setDate(new Date().getDate() - i));
		dayEnd = new Date(dayEnd.setMilliseconds(999));
		dayEnd = new Date(dayEnd.setSeconds(59));
		dayEnd = new Date(dayEnd.setMinutes(59));
		dayEnd = new Date(dayEnd.setHours(23));
		// day = day.getTime();

		const total = users.filter(u =>
			u.createdAt < dayEnd && (u.deletedAt == null || u.deletedAt > dayEnd)
		).length;

		const created = users.filter(u =>
			u.createdAt < dayEnd && u.createdAt > dayStart
		).length;

		graph.push({
			total: total,
			created: created
		});
	}

	res(graph);
});