unify subdomain validation schema to handle edge cases

src/lib/subdomain-utils.ts

@@ -0,0 +1,59 @@
+
+export type DomainType = "organization" | "provided" | "provided-search";
+
+export const SINGLE_LABEL_RE = /^[a-z0-9-]+$/i; // provided-search (no dots)
+export const MULTI_LABEL_RE = /^[a-z0-9-]+(\.[a-z0-9-]+)*$/i; // ns/wildcard
+export const SINGLE_LABEL_STRICT_RE = /^[a-z0-9](?:[a-z0-9-]*[a-z0-9])?$/i; // start/end alnum
+
+
+export function sanitizeInputRaw(input: string): string {
+  if (!input) return "";
+  return input.toLowerCase().replace(/[^a-z0-9.-]/g, "");
+}
+
+export function finalizeSubdomainSanitize(input: string): string {
+  if (!input) return "";
+  return input
+    .toLowerCase()
+    .replace(/[^a-z0-9.-]/g, "")   // allow only valid chars
+    .replace(/\.{2,}/g, ".")       // collapse multiple dots
+    .replace(/^-+|-+$/g, "")       // strip leading/trailing hyphens
+    .replace(/^\.+|\.+$/g, "");    // strip leading/trailing dots
+}
+
+
+
+
+export function validateByDomainType(subdomain: string, domainType: { type: "provided-search" | "organization"; domainType?: "ns" | "cname" | "wildcard" } ): boolean {
+  if (!domainType) return false;
+
+  if (domainType.type === "provided-search") {
+    return SINGLE_LABEL_RE.test(subdomain);
+  }
+
+  if (domainType.type === "organization") {
+    if (domainType.domainType === "cname") {
+      return subdomain === "";
+    } else if (domainType.domainType === "ns" || domainType.domainType === "wildcard") {
+      if (subdomain === "") return true;
+      if (!MULTI_LABEL_RE.test(subdomain)) return false;
+      const labels = subdomain.split(".");
+      return labels.every(l => l.length >= 1 && l.length <= 63 && SINGLE_LABEL_RE.test(l));
+    }
+  }
+  return false;
+}
+
+
+
+export const isValidSubdomainStructure = (input: string): boolean => {
+  const regex = /^(?!-)([a-zA-Z0-9-]{1,63})(?<!-)$/;
+
+  if (!input) return false;
+  if (input.includes("..")) return false;
+
+  return input.split(".").every(label => regex.test(label));
+};
+
+
+