Implement instance blocking (#4182)

* Implement instance blocking

* Add missing text

* Delete unnecessary file

* Covert Punycode to Unicode

src/server/api/endpoints/admin/federation/update-instance.ts

@@ -0,0 +1,34 @@
+import $ from 'cafy';
+import define from '../../../define';
+import Instance from '../../../../../models/instance';
+
+export const meta = {
+	requireCredential: true,
+	requireModerator: true,
+
+	params: {
+		host: {
+			validator: $.str
+		},
+
+		isBlocked: {
+			validator: $.bool
+		},
+	}
+};
+
+export default define(meta, (ps, me) => new Promise(async (res, rej) => {
+	const instance = await Instance.findOne({ host: ps.host });
+
+	if (instance == null) {
+		return rej('instance not found');
+	}
+
+	Instance.update({ host: ps.host }, {
+		$set: {
+			isBlocked: ps.isBlocked
+		}
+	});
+
+	res();
+}));