codimd/public/js/render.js

38 lines
1.4 KiB
JavaScript

var whiteListTag = ['style', '!--', 'kbd'];
var whiteListAttr = ['id', 'class', 'style'];
var filterXSSOptions = {
allowCommentTag: true,
escapeHtml: function (html) {
// to allow html comment in multiple lines
return html.replace(/<(.*?)>/g, '&lt;$1&gt;');
},
onIgnoreTag: function (tag, html, options) {
// allow style in html
if (whiteListTag.indexOf(tag) !== -1) {
// do not filter its attributes
return html;
}
},
onTagAttr: function (tag, name, value, isWhiteAttr) {
// allow href starts with '.' or '/'
if (isWhiteAttr && name === 'href' && (value.indexOf('.') == 0 || value.indexOf('/') == 0)) {
return name + '="' + filterXSS.escapeAttrValue(value) + '"';
}
},
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) + '"';
}
// allow ol specify start number
if (tag === 'ol' && name === 'start') {
return name + '="' + filterXSS.escapeAttrValue(value) + '"';
}
}
};
function preventXSS(html) {
return filterXSS(html, filterXSSOptions);
}