codeql/javascript/ql/test/query-tests/Security/CWE-079/UnsafeHtmlConstruction/main.js

module.exports.xssThroughHTMLConstruction = function (s) {
    const html = "<span>" + s + "</span>";// NOT OK
    document.querySelector("#html").innerHTML = html;
}
 
module.exports.xssThroughXMLParsing = function (s) {
    const doc = new DOMParser().parseFromString(s, "text/xml"); // NOT OK
    document.querySelector("#xml").appendChild(doc.documentElement);
}

module.exports.xssThroughMoreComplexXMLParsing = function (s) {
    const doc = new DOMParser().parseFromString(s, "text/xml"); // NOT OK
    const xml = doc.documentElement;
    
    const tmp = document.createElement('span');
    tmp.appendChild(xml.cloneNode()); 
    document.querySelector("#xml").appendChild(tmp);
}

const markdown = require('markdown-it')({html: true});
module.exports.xssThroughMarkdown = function (s) {
    const html = markdown.render(s); // NOT OK
    document.querySelector("#markdown").innerHTML = html;
}

const striptags = require('striptags');
module.exports.sanitizedHTML = function (s) {
    const html = striptags("<span>" + s + "</span>"); // OK
    document.querySelector("#sanitized").innerHTML = html;
}

module.exports.ts = require("./typed");

module.exports.jquery = require("./jquery-plugin");

module.exports.plainDOMXMLParsing = function (s) {
    const doc = new DOMParser().parseFromString(s, "text/xml"); // OK - is never added to the DOM.
}

class Foo {
    constructor(s) {
        this.step = s;
    }

    doXss() {
        // not called here, but still bad.
        document.querySelector("#class").innerHTML = "<span>" + this.step + "</span>"; // NOT OK
    }

}

module.exports.createsClass = function (s) {
    return new Foo(s);
}

$.fn.xssPlugin = function (options) {
    const defaults = {
        name: "name"
    };
    const settings = $.extend(defaults, options);
    return this.each(function () {
        $("<b>" + settings.name + "</b>").appendTo(this); // NOT OK
    });
}

module.exports.guards = function (attrVal) {
    document.querySelector("#id").innerHTML = "<img alt=\"" + attrVal + "\"/>"; // NOT OK
    document.querySelector("#id").innerHTML = "<img alt=\"" + attrVal.replace(/"|'/g, "") + "\"/>"; // OK
    if (attrVal.indexOf("\"") === -1 && attrVal.indexOf("'") === -1) {
        document.querySelector("#id").innerHTML = "<img alt=\"" + attrVal + "\"/>"; // OK
    }
}

module.exports.intentionalTemplate = function (obj) {
    const html = "<span>" + obj.spanTemplate + "</span>"; // OK
    document.querySelector("#template").innerHTML = html;
}