livr-extra-rules/src/rules/base64.js

Extra rules for LIVR Validator

const util = require('../util');
const requireRe = /^(?:[A-Za-z0-9+\/]{4})*(?:[A-Za-z0-9+\/]{2}==|[A-Za-z0-9+\/]{3}=)?$/;
const optionalRe = /^(?:[A-Za-z0-9+\/]{4})*(?:[A-Za-z0-9+\/]{2}(==)?|[A-Za-z0-9+\/]{3}=?)?$/;

function base64(padding) {
    const base64Re = padding === 'relaxed' ? optionalRe : requireRe;

    return (value, params, outputArr) => {
        if (util.isNoValue(value)) return;
        if (!util.isPrimitiveValue(value)) return 'FORMAT_ERROR';

        if (!base64Re.test(value + '')) return 'MALFORMED_BASE64';

        outputArr.push(value + '');

        return;
    };
}

module.exports = base64;