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import sanitizeHtml from "sanitize-html"
const TRACKING_PIXEL_DIMENSION_THRESHOLD = 3
function isTrackingPixel(tagName: string, attributes: Record<string, string>): boolean {
if (tagName !== "img") return false
const width = parseInt(attributes.width, 10)
const height = parseInt(attributes.height, 10)
if (!isNaN(width) && width <= TRACKING_PIXEL_DIMENSION_THRESHOLD) return true
if (!isNaN(height) && height <= TRACKING_PIXEL_DIMENSION_THRESHOLD) return true
return false
}
const SANITIZE_OPTIONS: sanitizeHtml.IOptions = {
allowedTags: [
"h1",
"h2",
"h3",
"h4",
"h5",
"h6",
"p",
"a",
"ul",
"ol",
"li",
"blockquote",
"pre",
"code",
"em",
"strong",
"del",
"br",
"hr",
"img",
"figure",
"figcaption",
"table",
"thead",
"tbody",
"tr",
"th",
"td",
],
allowedAttributes: {
a: ["href", "title", "rel"],
img: ["src", "alt", "title", "width", "height"],
},
allowedSchemes: ["http", "https"],
exclusiveFilter: (frame) => isTrackingPixel(frame.tag, frame.attribs),
}
export function sanitizeEntryContent(htmlContent: string): string {
return sanitizeHtml(htmlContent, SANITIZE_OPTIONS)
}
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