refactoring

Resolve #7779

packages/backend/src/server/api/common/inject-featured.ts

@@ -0,0 +1,56 @@
+import rndstr from 'rndstr';
+import { Note } from '@/models/entities/note';
+import { User } from '@/models/entities/user';
+import { Notes, UserProfiles, NoteReactions } from '@/models/index';
+import { generateMutedUserQuery } from './generate-muted-user-query';
+import { generateBlockedUserQuery } from './generate-block-query';
+
+// TODO: リアクション、Renote、返信などをしたノートは除外する
+
+export async function injectFeatured(timeline: Note[], user?: User | null) {
+	if (timeline.length < 5) return;
+
+	if (user) {
+		const profile = await UserProfiles.findOneOrFail(user.id);
+		if (!profile.injectFeaturedNote) return;
+	}
+
+	const max = 30;
+	const day = 1000 * 60 * 60 * 24 * 3; // 3日前まで
+
+	const query = Notes.createQueryBuilder('note')
+		.addSelect('note.score')
+		.where('note.userHost IS NULL')
+		.andWhere(`note.score > 0`)
+		.andWhere(`note.createdAt > :date`, { date: new Date(Date.now() - day) })
+		.andWhere(`note.visibility = 'public'`)
+		.innerJoinAndSelect('note.user', 'user');
+
+	if (user) {
+		query.andWhere('note.userId != :userId', { userId: user.id });
+
+		generateMutedUserQuery(query, user);
+		generateBlockedUserQuery(query, user);
+
+		const reactionQuery = NoteReactions.createQueryBuilder('reaction')
+			.select('reaction.noteId')
+			.where('reaction.userId = :userId', { userId: user.id });
+
+		query.andWhere(`note.id NOT IN (${ reactionQuery.getQuery() })`);
+	}
+
+	const notes = await query
+		.orderBy('note.score', 'DESC')
+		.take(max)
+		.getMany();
+
+	if (notes.length === 0) return;
+
+	// Pick random one
+	const featured = notes[Math.floor(Math.random() * notes.length)];
+
+	(featured as any)._featuredId_ = rndstr('a-z0-9', 8);
+
+	// Inject featured
+	timeline.splice(3, 0, featured);
+}