Implement instance blocking (#4182)

* Implement instance blocking

* Add missing text

* Delete unnecessary file

* Covert Punycode to Unicode

src/remote/activitypub/request.ts

@@ -4,11 +4,13 @@ import { URL } from 'url';
 import * as crypto from 'crypto';
 import { lookup, IRunOptions } from 'lookup-dns-cache';
 import * as promiseAny from 'promise-any';
+import { toUnicode } from 'punycode';
 
 import config from '../../config';
 import { ILocalUser } from '../../models/user';
 import { publishApLogStream } from '../../services/stream';
 import { apLogger } from './logger';
+import Instance from '../../models/instance';
 
 export const logger = apLogger.createSubLogger('deliver');
 
@@ -19,6 +21,11 @@ export default (user: ILocalUser, url: string, object: any) => new Promise(async
 
 	const { protocol, host, hostname, port, pathname, search } = new URL(url);
 
+	// ブロックしてたら中断
+	// TODO: いちいちデータベースにアクセスするのはコスト高そうなのでどっかにキャッシュしておく
+	const instance = await Instance.findOne({ host: toUnicode(host) });
+	if (instance && instance.isBlocked) return;
+
 	const data = JSON.stringify(object);
 
 	const sha256 = crypto.createHash('sha256');