feat: #12589, add nodeinfo endpoint

src/routes/well-known.js

@@ -1,9 +1,76 @@
 'use strict';
 
+const nconf = require('nconf');
+const meta = require('../meta');
+const db = require('../database');
+
 module.exports = function (app, middleware, controllers) {
+	const url = nconf.get('url');
+	const version = nconf.get('version');
+
 	app.use('/.well-known/change-password', (req, res) => {
 		res.redirect('/me/edit/password');
 	});
 
 	app.get('/.well-known/webfinger', controllers['well-known'].webfinger);
+
+	app.get('/.well-known/nodeinfo', (req, res) => {
+		res.json({
+			links: [
+				{
+					rel: 'http://nodeinfo.diaspora.software/ns/schema/2.0',
+					href: `${url}/nodeinfo/2.0`,
+				},
+			],
+		});
+	});
+
+	app.get('/nodeinfo/2.0', async (req, res) => {
+		const getDaysInMonth = (year, month) => new Date(year, month, 0).getDate();
+
+		function addMonths(input, months) {
+			const date = new Date(input);
+			date.setDate(1);
+			date.setMonth(date.getMonth() + months);
+			date.setDate(Math.min(input.getDate(), getDaysInMonth(date.getFullYear(), date.getMonth() + 1)));
+			return date;
+		}
+
+		const oneMonthAgo = addMonths(new Date(), -1);
+		const sixMonthsAgo = addMonths(new Date(), -6);
+
+		const [{ postCount, userCount }, activeMonth, activeHalfyear] = await Promise.all([
+			db.getObjectFields('global', ['userCount', 'userCount']),
+			db.sortedSetCount('users:online', oneMonthAgo.getTime(), '+inf'),
+			db.sortedSetCount('users:online', sixMonthsAgo.getTime(), '+inf'),
+		]);
+
+		res.json({
+			version: '2.0',
+			software: {
+				name: 'NodeBB',
+				version: version,
+			},
+			protocols: [
+				'activitypub',
+			],
+			services: {
+				outbound: [],
+				inbound: [],
+			},
+			usage: {
+				users: {
+					total: userCount,
+					activeMonth: activeMonth,
+					activeHalfyear: activeHalfyear,
+				},
+				localPosts: postCount,
+			},
+			openRegistrations: meta.config.registrationType === 'normal',
+			metadata: {
+				nodeName: meta.config.title || 'NodeBB',
+				nodeDescription: meta.config.description || '',
+			},
+		});
+	});
 };