@nodesecure/js-x-ray/dist/utils/isStringBase64.js

JavaScript AST XRay analysis

export function isStringBase64(v, opts = {}) {
    if (opts.allowEmpty === false && v === "") {
        return false;
    }
    let regex = "(?:[A-Za-z0-9+\\/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+\\/]{3}=)?";
    const mimeRegex = "(data:\\w+\\/[a-zA-Z\\+\\-\\.]+;base64,)";
    if (opts.mimeRequired === true) {
        regex = mimeRegex + regex;
    }
    else if (opts.allowMime === true) {
        regex = mimeRegex + "?" + regex;
    }
    if (opts.paddingRequired === false) {
        regex = "(?:[A-Za-z0-9+\\/]{4})*(?:[A-Za-z0-9+\\/]{2}(==)?|[A-Za-z0-9+\\/]{3}=?)?";
    }
    return (new RegExp("^" + regex + "$", "gi")).test(v);
}
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