refactoring

Resolve #7779

packages/backend/src/misc/check-word-mute.ts

@@ -0,0 +1,39 @@
+const RE2 = require('re2');
+import { Note } from '@/models/entities/note';
+import { User } from '@/models/entities/user';
+
+type NoteLike = {
+	userId: Note['userId'];
+	text: Note['text'];
+};
+
+type UserLike = {
+	id: User['id'];
+};
+
+export async function checkWordMute(note: NoteLike, me: UserLike | null | undefined, mutedWords: string[][]): Promise<boolean> {
+	// 自分自身
+	if (me && (note.userId === me.id)) return false;
+
+	const words = mutedWords
+		// Clean up
+		.map(xs => xs.filter(x => x !== ''))
+		.filter(xs => xs.length > 0);
+
+	if (words.length > 0) {
+		if (note.text == null) return false;
+
+		const matched = words.some(and =>
+			and.every(keyword => {
+				const regexp = keyword.match(/^\/(.+)\/(.*)$/);
+				if (regexp) {
+					return new RE2(regexp[1], regexp[2]).test(note.text!);
+				}
+				return note.text!.includes(keyword);
+			}));
+
+		if (matched) return true;
+	}
+
+	return false;
+}