refactoring

Resolve #7779

packages/backend/src/server/api/common/generate-visibility-query.ts

@@ -0,0 +1,40 @@
+import { User } from '@/models/entities/user';
+import { Followings } from '@/models/index';
+import { Brackets, SelectQueryBuilder } from 'typeorm';
+
+export function generateVisibilityQuery(q: SelectQueryBuilder<any>, me?: { id: User['id'] } | null) {
+	if (me == null) {
+		q.andWhere(new Brackets(qb => { qb
+			.where(`note.visibility = 'public'`)
+			.orWhere(`note.visibility = 'home'`);
+		}));
+	} else {
+		const followingQuery = Followings.createQueryBuilder('following')
+			.select('following.followeeId')
+			.where('following.followerId = :followerId', { followerId: me.id });
+
+		q.andWhere(new Brackets(qb => { qb
+			// 公開投稿である
+			.where(new Brackets(qb => { qb
+				.where(`note.visibility = 'public'`)
+				.orWhere(`note.visibility = 'home'`);
+			}))
+			// または 自分自身
+			.orWhere('note.userId = :userId1', { userId1: me.id })
+			// または 自分宛て
+			.orWhere(`'{"${me.id}"}' <@ note.visibleUserIds`)
+			.orWhere(new Brackets(qb => { qb
+				// または フォロワー宛ての投稿であり、
+				.where('note.visibility = \'followers\'')
+				.andWhere(new Brackets(qb => { qb
+					// 自分がフォロワーである
+					.where(`note.userId IN (${ followingQuery.getQuery() })`)
+					// または 自分の投稿へのリプライ
+					.orWhere('note.replyUserId = :userId3', { userId3: me.id });
+				}));
+			}));
+		}));
+
+		q.setParameters(followingQuery.getParameters());
+	}
+}