/.well-known 周りをいい感じに (#4141)

* Enhance /.well-known and their friends

* Fix bug

src/server/nodeinfo.ts

@@ -0,0 +1,73 @@
+import * as Router from 'koa-router';
+import config from '../config';
+import fetchMeta from '../misc/fetch-meta';
+import User from '../models/user';
+import { name as softwareName, version, repository } from '../../package.json';
+import Note from '../models/note';
+
+const router = new Router();
+
+const nodeinfo2_1path = '/nodeinfo/2.1';
+const nodeinfo2_0path = '/nodeinfo/2.0';
+
+export const links = [/* (awaiting release) {
+	rel: 'http://nodeinfo.diaspora.software/ns/schema/2.1',
+	href: config.url + nodeinfo2_1path
+}, */{
+	rel: 'http://nodeinfo.diaspora.software/ns/schema/2.0',
+	href: config.url + nodeinfo2_0path
+}];
+
+const nodeinfo2 = async () => {
+	const [
+		{ name, description, maintainer, langs, broadcasts, disableRegistration, disableLocalTimeline, disableGlobalTimeline, enableRecaptcha, maxNoteTextLength, enableTwitterIntegration, enableGithubIntegration, enableDiscordIntegration, enableEmail, enableServiceWorker },
+		total,
+		activeHalfyear,
+		activeMonth,
+		localPosts,
+		localComments
+	] = await Promise.all([
+		fetchMeta(),
+		User.count({ host: null }),
+		User.count({ host: null, updatedAt: { $gt: new Date(Date.now() - 15552000000) } }),
+		User.count({ host: null, updatedAt: { $gt: new Date(Date.now() - 2592000000) } }),
+		Note.count({ '_user.host': null, replyId: null }),
+		Note.count({ '_user.host': null, replyId: { $ne: null } })
+	]);
+
+	return {
+		software: {
+			name: softwareName,
+			version,
+			repository: repository.url
+		},
+		protocols: ['activitypub'],
+		services: {
+			inbound: [] as string[],
+			outbound: ['atom1.0', 'rss2.0']
+		},
+		openRegistrations: !disableRegistration,
+		usage: {
+			users: { total, activeHalfyear, activeMonth },
+			localPosts,
+			localComments
+		},
+		metadata: { name, description, maintainer, langs, broadcasts, disableRegistration, disableLocalTimeline, disableGlobalTimeline, enableRecaptcha, maxNoteTextLength, enableTwitterIntegration, enableGithubIntegration, enableDiscordIntegration, enableEmail, enableServiceWorker }
+	};
+};
+
+router.get(nodeinfo2_1path, async ctx => {
+	const base = await nodeinfo2();
+
+	ctx.body = { version: '2.1', ...base };
+});
+
+router.get(nodeinfo2_0path, async ctx => {
+	const base = await nodeinfo2();
+
+	delete base.software.repository;
+
+	ctx.body = { version: '2.0', ...base };
+});
+
+export default router;