barkey/packages/frontend/src/scripts/check-word-mute.ts

/*
 * SPDX-FileCopyrightText: syuilo and misskey-project
 * SPDX-License-Identifier: AGPL-3.0-only
 */

import type { Note, MeDetailed } from "misskey-js/entities.js";

export function checkWordMute(note: Note, me: MeDetailed | null | undefined, mutedWords: Array<string | string[]>): boolean {
	// 自分自身
	if (me && (note.userId === me.id)) return false;

	if (mutedWords.length > 0) {
		const text = getNoteText(note);

		if (text === '') return false;

		const matched = mutedWords.some(filter => {
			if (Array.isArray(filter)) {
				// Clean up
				const filteredFilter = filter.filter(keyword => keyword !== '');
				if (filteredFilter.length === 0) return false;

				return filteredFilter.every(keyword => text.includes(keyword));
			} else {
				// represents RegExp
				const regexp = filter.match(/^\/(.+)\/(.*)$/);

				// This should never happen due to input sanitisation.
				if (!regexp) return false;

				try {
					return new RegExp(regexp[1], regexp[2]).test(text);
				} catch (err) {
					// This should never happen due to input sanitisation.
					return false;
				}
			}
		});

		if (matched) return true;
	}

	return false;
}

function getNoteText(note: Note): string {
	const textParts: string[] = [];

	if (note.cw)
		textParts.push(note.cw);

	if (note.text)
		textParts.push(note.text);

	if (note.files)
		for (const file of note.files)
			if (file.comment)
				textParts.push(file.comment);

	if (note.poll)
		for (const choice of note.poll.choices)
			if (choice.text)
				textParts.push(choice.text);

	return textParts.join('\n').trim();
}