egirlskey/packages/backend/src/server/api/endpoints/notes/state.ts

import $ from 'cafy';
import { ID } from '@/misc/cafy-id';
import define from '../../define';
import { NoteFavorites, Notes, NoteThreadMutings, NoteWatchings } from '@/models/index';

export const meta = {
	tags: ['notes'],

	requireCredential: true as const,

	params: {
		noteId: {
			validator: $.type(ID),
		}
	},

	res: {
		type: 'object' as const,
		optional: false as const, nullable: false as const,
		properties: {
			isFavorited: {
				type: 'boolean' as const,
				optional: false as const, nullable: false as const
			},
			isWatching: {
				type: 'boolean' as const,
				optional: false as const, nullable: false as const
			},
			isMutedThread: {
				type: 'boolean' as const,
				optional: false as const, nullable: false as const
			},
		}
	}
};

export default define(meta, async (ps, user) => {
	const note = await Notes.findOneOrFail(ps.noteId);

	const [favorite, watching, threadMuting] = await Promise.all([
		NoteFavorites.count({
			where: {
				userId: user.id,
				noteId: note.id,
			},
			take: 1
		}),
		NoteWatchings.count({
			where: {
				userId: user.id,
				noteId: note.id,
			},
			take: 1
		}),
		NoteThreadMutings.count({
			where: {
				userId: user.id,
				threadId: note.threadId || note.id,
			},
			take: 1
		}),
	]);

	return {
		isFavorited: favorite !== 0,
		isWatching: watching !== 0,
		isMutedThread: threadMuting !== 0,
	};
});