41 lines
1.2 KiB
TypeScript
41 lines
1.2 KiB
TypeScript
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/** Check if a URL has a safe http(s) protocol */
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export function isSafeImgSrc(src: string): boolean {
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try {
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const u = new URL(src)
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return /^https?:$/i.test(u.protocol)
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} catch {
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return false
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}
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}
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/** Type-guard variant: check if value is a defined, safe http(s) URL */
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export function isSafeUrl(u: string | undefined): u is string {
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return !!u && typeof u === 'string' && /^https?:\/\//i.test(u.trim())
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}
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import DOMPurify from 'dompurify'
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const ALLOWED_TAGS_LIST = ['p', 'br', 'a', 'strong', 'em', 'b', 'i', 'ul', 'ol', 'li', 'blockquote', 'h1', 'h2', 'h3', 'h4', 'span', 'div']
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/** Sanitize HTML using DOMPurify with restricted tag set */
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export function sanitizeHtml(html: string): string {
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return DOMPurify.sanitize(html, {
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ALLOWED_TAGS: ALLOWED_TAGS_LIST,
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ALLOWED_ATTR: ['href', 'src', 'target', 'rel'],
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})
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}
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/** Escape HTML entities for safe rendering in a text context */
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export function escapeHtml(text: string): string {
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return text.replace(/&/g, '&').replace(/</g, '<').replace(/>/g, '>')
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}
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/** Extract a domain from a URL, stripping www prefix */
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export function formatDomain(url: string): string {
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try {
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return new URL(url).hostname.replace(/^www\./, '')
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} catch {
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return url
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}
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}
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