62 lines
2.2 KiB
JavaScript
62 lines
2.2 KiB
JavaScript
// allow some attributes
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var whiteListAttr = ['id', 'class', 'style'];
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window.whiteListAttr = whiteListAttr;
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// allow link starts with '.', '/' and custom protocol with '://'
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var linkRegex = /^([\w|-]+:\/\/)|^([\.|\/])+/;
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// allow data uri, from https://gist.github.com/bgrins/6194623
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var dataUriRegex = /^\s*data:([a-z]+\/[a-z0-9-+.]+(;[a-z-]+=[a-z0-9-]+)?)?(;base64)?,([a-z0-9!$&',()*+;=\-._~:@\/?%\s]*)\s*$/i;
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// custom white list
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var whiteList = filterXSS.whiteList;
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// allow ol specify start number
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whiteList['ol'] = ['start'];
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// allow style tag
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whiteList['style'] = [];
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// allow kbd tag
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whiteList['kbd'] = [];
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// allow ifram tag with some safe attributes
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whiteList['iframe'] = ['allowfullscreen', 'name', 'referrerpolicy', 'sandbox', 'src', 'srcdoc', 'width', 'height'];
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// allow summary tag
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whiteList['summary'] = [];
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var filterXSSOptions = {
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allowCommentTag: true,
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whiteList: whiteList,
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escapeHtml: function (html) {
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// allow html comment in multiple lines
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return html.replace(/<(.*?)>/g, '<$1>');
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},
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onIgnoreTag: function (tag, html, options) {
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// allow comment tag
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if (tag == "!--") {
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// do not filter its attributes
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return html;
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}
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},
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onTagAttr: function (tag, name, value, isWhiteAttr) {
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// allow href and src that match linkRegex
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if (isWhiteAttr && (name === 'href' || name === 'src') && linkRegex.test(value)) {
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return name + '="' + filterXSS.escapeAttrValue(value) + '"';
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}
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// allow data uri in img src
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if (isWhiteAttr && (tag == "img" && name === 'src') && dataUriRegex.test(value)) {
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return name + '="' + filterXSS.escapeAttrValue(value) + '"';
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}
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},
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onIgnoreTagAttr: function (tag, name, value, isWhiteAttr) {
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// allow attr start with 'data-' or in the whiteListAttr
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if (name.substr(0, 5) === 'data-' || whiteListAttr.indexOf(name) !== -1) {
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// escape its value using built-in escapeAttrValue function
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return name + '="' + filterXSS.escapeAttrValue(value) + '"';
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}
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}
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};
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function preventXSS(html) {
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return filterXSS(html, filterXSSOptions);
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}
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window.preventXSS = preventXSS;
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module.exports = {
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preventXSS: preventXSS
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}
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