iceshrimp/src/services/note/reaction/delete.ts

import { publishNoteStream } from '../../stream';
import renderLike from '../../../remote/activitypub/renderer/like';
import renderUndo from '../../../remote/activitypub/renderer/undo';
import { renderActivity } from '../../../remote/activitypub/renderer';
import { deliver } from '../../../queue';
import { IdentifiableError } from '../../../misc/identifiable-error';
import { User } from '../../../models/entities/user';
import { Note } from '../../../models/entities/note';
import { NoteReactions, Users, Notes } from '../../../models';

export default async (user: User, note: Note) => {
	// if already unreacted
	const exist = await NoteReactions.findOne({
		noteId: note.id,
		userId: user.id,
	});

	if (exist == null) {
		throw new IdentifiableError('60527ec9-b4cb-4a88-a6bd-32d3ad26817d', 'not reacted');
	}

	// Delete reaction
	await NoteReactions.delete(exist.id);

	// Decrement reactions count
	const sql = `jsonb_set("reactions", '{${exist.reaction}}', (COALESCE("reactions"->>'${exist.reaction}', '0')::int - 1)::text::jsonb)`;
	await Notes.createQueryBuilder().update()
		.set({
			reactions: () => sql,
		})
		.where('id = :id', { id: note.id })
		.execute();

	Notes.decrement({ id: note.id }, 'score', 1);

	publishNoteStream(note.id, 'unreacted', {
		reaction: exist.reaction,
		userId: user.id
	});

	//#region 配信
	// リアクターがローカルユーザーかつリアクション対象がリモートユーザーの投稿なら配送
	if (Users.isLocalUser(user) && (note.userHost !== null)) {
		const content = renderActivity(renderUndo(renderLike(user, note, exist.reaction), user));
		Users.findOne(note.userId).then(u => {
			deliver(user, content, u!.inbox);
		});
	}
	//#endregion
};