Base64 编码器

// base64.js

module.exports = async function(context) {
    const mode = context.args[0]; // 'encode' or 'decode'
    const text = context.args.slice(1).join(' ');
    
    if (mode === 'encode') {
        return Buffer.from(text).toString('base64');
    } else if (mode === 'decode') {
        return Buffer.from(text, 'base64').toString('utf-8');
    } else {
        return "Usage: base64 <encode|decode> <text>";
    }
};