feat(api): add federation/stats endpoint

packages/backend/src/server/api/endpoints.ts

@@ -135,6 +135,7 @@ import * as ep___federation_instances from './endpoints/federation/instances.js'
 import * as ep___federation_showInstance from './endpoints/federation/show-instance.js';
 import * as ep___federation_updateRemoteUser from './endpoints/federation/update-remote-user.js';
 import * as ep___federation_users from './endpoints/federation/users.js';
+import * as ep___federation_stats from './endpoints/federation/stats.js';
 import * as ep___following_create from './endpoints/following/create.js';
 import * as ep___following_delete from './endpoints/following/delete.js';
 import * as ep___following_invalidate from './endpoints/following/invalidate.js';
@@ -447,6 +448,7 @@ const eps = [
 	['federation/show-instance', ep___federation_showInstance],
 	['federation/update-remote-user', ep___federation_updateRemoteUser],
 	['federation/users', ep___federation_users],
+	['federation/stats', ep___federation_stats],
 	['following/create', ep___following_create],
 	['following/delete', ep___following_delete],
 	['following/invalidate', ep___following_invalidate],

packages/backend/src/server/api/endpoints/federation/stats.ts

+import { MoreThan } from 'typeorm';
+import { Instances } from '@/models/index.js';
+import { awaitAll } from '@/prelude/await-all.js';
+import define from '../../define.js';
+
+export const meta = {
+	tags: ['federation'],
+
+	requireCredential: false,
+
+	allowGet: true,
+	cacheSec: 60 * 60,
+} as const;
+
+export const paramDef = {
+	type: 'object',
+	properties: {
+	},
+	required: [],
+} as const;
+
+// eslint-disable-next-line import/no-default-export
+export default define(meta, paramDef, async (ps) => {
+	const [topSubInstances, topPubInstances] = await Promise.all([
+		Instances.find({
+			where: {
+				followersCount: MoreThan(0),
+			},
+			order: {
+				followersCount: 'DESC',
+			},
+			take: 10,
+		}),
+		Instances.find({
+			where: {
+				followingCount: MoreThan(0),
+			},
+			order: {
+				followingCount: 'DESC',
+			},
+			take: 10,
+		}),
+	]);
+
+	return await awaitAll({
+		topSubInstances: Instances.packMany(topSubInstances),
+		topPubInstances: Instances.packMany(topPubInstances),
+	});
+});