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

JavaScript AST XRay analysis

// CONSTANTS
const kDefaultBase64Regex = /^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=)?$/i;
const kBase64NoPaddingRegex = /^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}(==)?|[A-Za-z0-9+/]{3}=?)?$/i;
const kBase64AllowMimeRegex = /^(data:\w+\/[a-zA-Z+\-.]+;base64,)?(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=)?$/i;
const kBase64AllowMimeNoPaddingRegex = /^(data:\w+\/[a-zA-Z+\-.]+;base64,)?(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}(==)?|[A-Za-z0-9+/]{3}=?)?$/i;
const kBase64RequireMimeRegex = /^(data:\w+\/[a-zA-Z+\-.]+;base64,)(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=)?$/i;
const kBase64RequireMimeNoPaddingRegex = /^(data:\w+\/[a-zA-Z+\-.]+;base64,)(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}(==)?|[A-Za-z0-9+/]{3}=?)?$/i;
export function isStringBase64(v, opts = {}) {
    if (opts.allowEmpty === false && v === "") {
        return false;
    }
    if (opts.mimeRequired === true) {
        return opts.paddingRequired === false
            ? kBase64RequireMimeNoPaddingRegex.test(v)
            : kBase64RequireMimeRegex.test(v);
    }
    if (opts.allowMime === true) {
        return opts.paddingRequired === false
            ? kBase64AllowMimeNoPaddingRegex.test(v)
            : kBase64AllowMimeRegex.test(v);
    }
    // paddingRequired === false (no mime)
    if (opts.paddingRequired === false) {
        return kBase64NoPaddingRegex.test(v);
    }
    // Default: no mime, padding required
    return kDefaultBase64Regex.test(v);
}
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