token switcher

try to take over your tokens!
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// ==UserScript==
// @name         token switcher
// @namespace    https://tampermonkey.net/
// @version      2.0.2
// @description  try to take over your tokens!
// @author       sophb.chan
// @core_author  sophb.chan
// @core_version 1.1.0
// @match        https://multiplayerpiano.org/*
// @match        https://multiplayerpiano.net/*
// @match        https://dev.multiplayerpiano.net/*
// @match        https://piano.mpp.community/*
// @icon         data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==
// @grant        none
// @license      CC BY-NC-SA 4.0
// @require      https://update.greasyfork.org/scripts/582107/1848144/MPP%20Userscript%20Core.js
// ==/UserScript==

prefix = '~';
private = true

const tokens = readItem('knownTokens', {});
tokens.current = localStorage.token;
tokens.ipbound = '';
let defaultToken = readItem('defaultToken', localStorage.token);

function setDefaultToken(name) {
    if (!user)
        throw new Error('Token name must be specified.');

    if (tokens[name] != null) {
        defaultToken = name;
        storeItem('defaultToken', name);
    } else throw new ReferenceError(`Unknown token "${name}"`);
}
function addToken() {
    const token = prompt(`
(In-built UI coming soon!)
Please specify the token you want to save:
        `.trim());

    if (token == null) return;
    if (!token) {
        alert('Cannot save empty token!');    
        return addToken();
    }

    const name = prompt(`
(In-built UI coming soon!)
Please specify the token's name:
        `.trim());

    if (!name) {
        const label = i => `unnamed-token-${i}`; 
        let unnamedIndex = 0;
        do {
            unnamedIndex++;
        } while (tokens[label(unnamedIndex)] == null);

        name = label(unnamedIndex);
    }

    const isCorrect = confirm(`
Token registered.
Name: ${name}
Token: ${token}

Press Cancel to change the information.
    `.trim());

    if (isCorrect) {
        tokens[name] = token;
        return storeItem('knownTokens', tokens);
    }
    else return addToken();
}

registerCommand('help', (({
    args
} = {}) => {
    receive(`Commands: \`${
        prefix +
        Object.keys(cmds).join(
            `\`, \`${prefix}`
        )
    }\``);
}), {
    aliases: ['h']
});
registerCommand('set', (({
    args
} = {}) => {
    if (args.length === 0) {
        receive('Please specify a user token to set to.');
        receive(`Tokens: \`${Object.keys(tokens).join('`, `')}\``);
        return;
    }
    if (tokens[args[0]]) {
        localStorage.token = tokens[args[0]];
        receive('Token set. Reconnecting...');
        MPP.client.stop();
        MPP.client.start();
    } else receive(`The token \`${args[0]}\` was not found.`);
}));
registerCommand('reset', (() => {
    localStorage.token = tokens[defaultToken];
    send('Token set to default. Reconnecting...');
    MPP.client.stop();
    MPP.client.start();
}));
registerCommand('default', (({
    args
} = {}) => {
    if (args.length === 0) {
        receive('Please specify a user token to set as the default.');
        receive(`Tokens: \`${Object.keys(tokens).join('`, `')}\``);
        return;
    }
    if (tokens[args[0]]) {
        setDefaultToken(args[0]);
        receive(`Default token now set to \`${args[0]}\`.`);
        MPP.client.stop();
        MPP.client.start();
    } else receive(`The token \`${args[0]}\` was not found.`);
}));
registerCommand('add', addToken);