@aikidosec/firewall/helpers/escapeHTML.js

Zen by Aikido is an embedded Application Firewall that autonomously protects Node.js apps against common and critical attacks, provides rate limiting, detects malicious traffic (including bots), and more.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.escapeHTML = escapeHTML;
/** Used to map characters to HTML entities. */
const htmlEscapes = {
    "&": "&",
    "<": "&lt;",
    ">": "&gt;",
    '"': "&quot;",
    "'": "&#39;",
};
/** Used to match HTML entities and HTML characters. */
const reUnescapedHtml = /[&<>"']/g;
const reHasUnescapedHtml = RegExp(reUnescapedHtml.source);
/**
 * Converts the characters "&", "<", ">", '"', and "'" in `string` to their
 * corresponding HTML entities.
 *
 * **Note:** No other characters are escaped. To escape additional
 * characters use a third-party library like [_he_](https://mths.be/he).
 *
 * Though the ">" character is escaped for symmetry, characters like
 * ">" and "/" don't need escaping in HTML and have no special meaning
 * unless they're part of a tag or unquoted attribute value. See
 * [Mathias Bynens's article](https://mathiasbynens.be/notes/ambiguous-ampersands)
 * (under "semi-related fun fact") for more details.
 *
 * When working with HTML you should always
 * [quote attribute values](http://wonko.com/post/html-escaping) to reduce
 * XSS vectors.
 */
function escapeHTML(string) {
    return string && reHasUnescapedHtml.test(string)
        ? string.replace(reUnescapedHtml, (chr) => htmlEscapes[chr])
        : string || "";
}