firefish/packages/backend/src/misc/check-hit-antenna.ts

import type { Antenna } from "@/models/entities/antenna.js";
import type { Note } from "@/models/entities/note.js";
import type { User } from "@/models/entities/user.js";
import {
	UserListJoinings,
	UserGroupJoinings,
	Blockings,
} from "@/models/index.js";
import { getFullApAccount } from "./convert-host.js";
import * as Acct from "@/misc/acct.js";
import type { Packed } from "./schema.js";
import { Cache } from "./cache.js";

const blockingCache = new Cache<User["id"][]>(1000 * 60 * 5);

// NOTE: フォローしているユーザーのノート、リストのユーザーのノート、グループのユーザーのノート指定はパフォーマンス上の理由で無効になっている

/**
 * noteUserFollowers / antennaUserFollowing はどちらか一方が指定されていればよい
 */
export async function checkHitAntenna(
	antenna: Antenna,
	note: Note | Packed<"Note">,
	noteUser: { id: User["id"]; username: string; host: string | null },
	noteUserFollowers?: User["id"][],
	antennaUserFollowing?: User["id"][],
): Promise<boolean> {
	if (note.visibility === "specified") return false;

	// アンテナ作成者がノート作成者にブロックされていたらスキップ
	const blockings = await blockingCache.fetch(noteUser.id, () =>
		Blockings.findBy({ blockerId: noteUser.id }).then((res) =>
			res.map((x) => x.blockeeId),
		),
	);
	if (blockings.some((blocking) => blocking === antenna.userId)) return false;

	if (note.visibility === "followers") {
		if (noteUserFollowers && !noteUserFollowers.includes(antenna.userId))
			return false;
		if (antennaUserFollowing && !antennaUserFollowing.includes(note.userId))
			return false;
	}

	if (!antenna.withReplies && note.replyId != null) return false;

	if (antenna.src === "home") {
		if (noteUserFollowers && !noteUserFollowers.includes(antenna.userId))
			return false;
		if (antennaUserFollowing && !antennaUserFollowing.includes(note.userId))
			return false;
	} else if (antenna.src === "list") {
		const listUsers = (
			await UserListJoinings.findBy({
				userListId: antenna.userListId!,
			})
		).map((x) => x.userId);

		if (!listUsers.includes(note.userId)) return false;
	} else if (antenna.src === "group") {
		const joining = await UserGroupJoinings.findOneByOrFail({
			id: antenna.userGroupJoiningId!,
		});

		const groupUsers = (
			await UserGroupJoinings.findBy({
				userGroupId: joining.userGroupId,
			})
		).map((x) => x.userId);

		if (!groupUsers.includes(note.userId)) return false;
	} else if (antenna.src === "users") {
		const accts = antenna.users.map((x) => {
			const { username, host } = Acct.parse(x);
			return getFullApAccount(username, host).toLowerCase();
		});
		if (
			!accts.includes(
				getFullApAccount(noteUser.username, noteUser.host).toLowerCase(),
			)
		)
			return false;
	}

	const keywords = antenna.keywords
		// Clean up
		.map((xs) => xs.filter((x) => x !== ""))
		.filter((xs) => xs.length > 0);

	if (keywords.length > 0) {
		if (note.text == null) return false;

		const matched = keywords.some((and) =>
			and.every((keyword) =>
				antenna.caseSensitive
					? note.text!.includes(keyword)
					: note.text!.toLowerCase().includes(keyword.toLowerCase()),
			),
		);

		if (!matched) return false;
	}

	const excludeKeywords = antenna.excludeKeywords
		// Clean up
		.map((xs) => xs.filter((x) => x !== ""))
		.filter((xs) => xs.length > 0);

	if (excludeKeywords.length > 0) {
		if (note.text == null) return false;

		const matched = excludeKeywords.some((and) =>
			and.every((keyword) =>
				antenna.caseSensitive
					? note.text!.includes(keyword)
					: note.text!.toLowerCase().includes(keyword.toLowerCase()),
			),
		);

		if (matched) return false;
	}

	if (antenna.withFile) {
		if (note.fileIds && note.fileIds.length === 0) return false;
	}

	// TODO: eval expression

	return true;
}