refactoring

Resolve #7779

packages/backend/src/remote/activitypub/models/mention.ts

@@ -0,0 +1,24 @@
+import { toArray, unique } from '@/prelude/array';
+import { IObject, isMention, IApMention } from '../type';
+import { resolvePerson } from './person';
+import * as promiseLimit from 'promise-limit';
+import Resolver from '../resolver';
+import { User } from '@/models/entities/user';
+
+export async function extractApMentions(tags: IObject | IObject[] | null | undefined) {
+	const hrefs = unique(extractApMentionObjects(tags).map(x => x.href as string));
+
+	const resolver = new Resolver();
+
+	const limit = promiseLimit<User | null>(2);
+	const mentionedUsers = (await Promise.all(
+		hrefs.map(x => limit(() => resolvePerson(x, resolver).catch(() => null)))
+	)).filter((x): x is User => x != null);
+
+	return mentionedUsers;
+}
+
+export function extractApMentionObjects(tags: IObject | IObject[] | null | undefined): IApMention[] {
+	if (tags == null) return [];
+	return toArray(tags).filter(isMention);
+}