server: remove wildcard blocking and instead block subdomains

Changelog: Changed

packages/backend/src/misc/should-block-instance.ts

@@ -2,20 +2,6 @@ import { fetchMeta } from '@/misc/fetch-meta.js';
 import { Instance } from '@/models/entities/instance.js';
 import { Meta } from '@/models/entities/meta.js';
 
-/**
- * Returns whether a given host matches a wildcard pattern.
- * @param host punycoded instance host
- * @param pattern wildcard pattern containing a punycoded instance host
- * @returns whether the post matches the pattern
- */
-function matchHost(host: Instance['host'], pattern: string): boolean {
-	// Escape all of the regex special characters. Pattern from:
-	// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions#escaping
-	const escape = (str: string): string => str.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
-	const re = new RegExp('^' + pattern.split('*').map(escape).join('.*') + '$');
-
-	return re.test(host);
-}
 /**
  * Returns whether a specific host (punycoded) should be blocked.
  *
@@ -24,7 +10,7 @@ function matchHost(host: Instance['host'], pattern: string): boolean {
  * @returns whether the given host should be blocked
  */
 
-export async function shouldBlockInstance(host: string, meta: Promise<Meta> = fetchMeta()): Promise<boolean> {
+export async function shouldBlockInstance(host: Instance['host'], meta: Promise<Meta> = fetchMeta()): Promise<boolean> {
 	const { blockedHosts } = await meta;
-	return blockedHosts.some(blockedHost => matchHost(host, blockedHost));
+	return blockedHosts.some(blockedHost => host === blockedHost || host.endsWith('.' + blockedHost));
 }