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fix: Re-enable some style tags (#6982)

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This commit is contained in:
Michael Genson
2026-02-01 16:24:57 -06:00
committed by GitHub
parent af241dad57
commit d30118899d
1 changed files with 23 additions and 3 deletions
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26
frontend/components/global/SafeMarkdown.vue
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@@ -7,6 +7,10 @@
import DOMPurify from "isomorphic-dompurify"; import DOMPurify from "isomorphic-dompurify";
import { marked } from "marked"; import { marked } from "marked";
enum DOMPurifyHook {
UponSanitizeAttribute = "uponSanitizeAttribute",
}
export default defineNuxtComponent({ export default defineNuxtComponent({
props: { props: {
source: { source: {
@@ -15,14 +19,26 @@ export default defineNuxtComponent({
}, },
}, },
setup(props) { setup(props) {
const ALLOWED_STYLE_TAGS = [
"background-color", "color", "font-style", "font-weight", "text-decoration", "text-align",
];
function sanitizeMarkdown(rawHtml: string | null | undefined): string { function sanitizeMarkdown(rawHtml: string | null | undefined): string {
if (!rawHtml) { if (!rawHtml) {
return ""; return "";
} }
DOMPurify.addHook(DOMPurifyHook.UponSanitizeAttribute, (node, data) => {
if (data.attrName === "style") {
const styles = data.attrValue.split(";").filter((style) => {
const [property] = style.split(":");
return ALLOWED_STYLE_TAGS.includes(property.trim().toLowerCase());
});
data.attrValue = styles.join(";");
}
});
const sanitized = DOMPurify.sanitize(rawHtml, { const sanitized = DOMPurify.sanitize(rawHtml, {
// List based on
// https://support.zendesk.com/hc/en-us/articles/4408824584602-Allowing-unsafe-HTML-in-help-center-articles
ALLOWED_TAGS: [ ALLOWED_TAGS: [
"strong", "em", "b", "i", "u", "p", "code", "pre", "samp", "kbd", "var", "sub", "sup", "dfn", "cite", "strong", "em", "b", "i", "u", "p", "code", "pre", "samp", "kbd", "var", "sub", "sup", "dfn", "cite",
"small", "address", "hr", "br", "id", "div", "span", "h1", "h2", "h3", "h4", "h5", "h6", "small", "address", "hr", "br", "id", "div", "span", "h1", "h2", "h3", "h4", "h5", "h6",
@@ -31,10 +47,14 @@ export default defineNuxtComponent({
], ],
ALLOWED_ATTR: [ ALLOWED_ATTR: [
"href", "src", "alt", "height", "width", "class", "allow", "title", "allowfullscreen", "frameborder", "href", "src", "alt", "height", "width", "class", "allow", "title", "allowfullscreen", "frameborder",
"scrolling", "cite", "datetime", "name", "abbr", "target", "border", "start", "scrolling", "cite", "datetime", "name", "abbr", "target", "border", "start", "style",
], ],
}); });
Object.values(DOMPurifyHook).forEach((hook) => {
DOMPurify.removeHook(hook);
});
return sanitized; return sanitized;
} }