codimd/public/js/render.js

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JavaScript
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var whiteListTag = ['style', '!--'];
var whiteListAttr = ['id', 'class', 'style'];
var filterXSSOptions = {
allowCommentTag: true,
onIgnoreTag: function (tag, html, options) {
// allow style in html
if (whiteListTag.indexOf(tag) !== -1) {
// do not filter its attributes
return html;
}
},
onIgnoreTagAttr: function (tag, name, value, isWhiteAttr) {
// allow attr start with 'data-' or in the whiteListAttr
if (name.substr(0, 5) === 'data-' || whiteListAttr.indexOf(name) !== -1) {
// escape its value using built-in escapeAttrValue function
return name + '="' + filterXSS.escapeAttrValue(value) + '"';
}
}
};
function preventXSS(html) {
return filterXSS(html, filterXSSOptions);
}