59 lines
1.8 KiB
JavaScript
59 lines
1.8 KiB
JavaScript
import { sanitize as dompurifySanitize, addHook } from 'dompurify';
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import { getNormalizedURL, getBaseURL, relativePathToAbsolute } from '~/lib/utils/url_utility';
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const defaultConfig = {
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// Safely allow SVG <use> tags
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ADD_TAGS: ['use', 'gl-emoji', 'copy-code'],
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// Prevent possible XSS attacks with data-* attributes used by @rails/ujs
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// See https://gitlab.com/gitlab-org/gitlab-ui/-/issues/1421
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FORBID_ATTR: ['data-remote', 'data-url', 'data-type', 'data-method'],
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};
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// Only icons urls from `gon` are allowed
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const getAllowedIconUrls = (gon = window.gon) =>
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[gon.sprite_file_icons, gon.sprite_icons]
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.filter(Boolean)
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.map((path) => relativePathToAbsolute(path, getBaseURL()));
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const isUrlAllowed = (url) =>
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getAllowedIconUrls().some((allowedUrl) => getNormalizedURL(url).startsWith(allowedUrl));
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const isHrefSafe = (url) => url.match(/^#/) || isUrlAllowed(url);
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const removeUnsafeHref = (node, attr) => {
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if (!node.hasAttribute(attr)) {
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return;
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}
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if (!isHrefSafe(node.getAttribute(attr))) {
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node.removeAttribute(attr);
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}
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};
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/**
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* Sanitize icons' <use> tag attributes, to safely include
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* svgs such as in:
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*
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* <svg viewBox="0 0 100 100">
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* <use href="/assets/icons-xxx.svg#icon_name"></use>
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* </svg>
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*
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* It validates both href & xlink:href attributes.
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* Note that `xlink:href` is deprecated, but still in use
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* https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/xlink:href
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*
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* @param {Object} node - Node to sanitize
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*/
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const sanitizeSvgIcon = (node) => {
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removeUnsafeHref(node, 'href');
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removeUnsafeHref(node, 'xlink:href');
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};
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addHook('afterSanitizeAttributes', (node) => {
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if (node.tagName.toLowerCase() === 'use') {
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sanitizeSvgIcon(node);
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}
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});
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export const sanitize = (val, config) => dompurifySanitize(val, { ...defaultConfig, ...config });
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