Initial local backup snapshot

shared/socialLinks.ts

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+export function normalizeSocialUrl(value: string | null | undefined) {
+  const trimmed = (value || "").trim();
+  if (!trimmed) return "";
+  return trimmed;
+}
+
+function parseSocialUrl(value: string | null | undefined) {
+  const trimmed = normalizeSocialUrl(value);
+  if (!trimmed) return null;
+
+  try {
+    return new URL(trimmed);
+  } catch {
+    return null;
+  }
+}
+
+function isAllowedSocialHostname(hostname: string, allowed: string[]) {
+  return allowed.some((domain) => hostname === domain || hostname === `www.${domain}`);
+}
+
+export function isValidFacebookUrl(value: string | null | undefined) {
+  const url = parseSocialUrl(value);
+  if (!value || !String(value).trim()) return true;
+  if (!url) return false;
+  return url.protocol === "https:" && isAllowedSocialHostname(url.hostname.toLowerCase(), ["facebook.com", "fb.com"]);
+}
+
+export function isValidInstagramUrl(value: string | null | undefined) {
+  const url = parseSocialUrl(value);
+  if (!value || !String(value).trim()) return true;
+  if (!url) return false;
+  return url.protocol === "https:" && isAllowedSocialHostname(url.hostname.toLowerCase(), ["instagram.com"]);
+}
+
+export function getFacebookEmbedUrl(value: string | null | undefined) {
+  const trimmed = normalizeSocialUrl(value);
+  if (!isValidFacebookUrl(trimmed)) return null;
+  const url = new URL(trimmed);
+  const embedUrl = new URL("https://www.facebook.com/plugins/page.php");
+  embedUrl.searchParams.set("href", url.toString());
+  embedUrl.searchParams.set("tabs", "timeline");
+  embedUrl.searchParams.set("width", "500");
+  embedUrl.searchParams.set("height", "380");
+  embedUrl.searchParams.set("small_header", "true");
+  embedUrl.searchParams.set("adapt_container_width", "true");
+  embedUrl.searchParams.set("hide_cover", "false");
+  embedUrl.searchParams.set("show_facepile", "false");
+  return embedUrl.toString();
+}
+
+export function getSocialHandle(value: string | null | undefined) {
+  const url = parseSocialUrl(value);
+  if (!url) return null;
+
+  const handle = url.pathname
+    .split("/")
+    .map((part) => part.trim())
+    .filter(Boolean)[0];
+
+  return handle ? `@${handle}` : null;
+}