@fto-consult/node-utils/src/base64.js

Bibliothèque d'outils pour application nodeJS

module.exports = {
    isBase64 : function isBase64(str, options) {
        if(!str || typeof str !=='string') return false;
        options = Object.assign({},options);
        options.urlSafe = typeof options.urlSafe =='boolean'? options.urlSafe: false;
        const len = str.length;
        if (options.urlSafe) {
            return /^[A-Z0-9_\-]*$/i.test(str);
        }
        if (len % 4 !== 0 || /[^A-Z0-9+\/=]/i.test(str)) {
            return false;
        }
        const firstPaddingChar = str.indexOf('=');
        return firstPaddingChar === -1 || firstPaddingChar === len - 1 || (firstPaddingChar === len - 2 && str[len - 1] === '=');
    }
}