Move admin area to root subdomain

lib/admin-routing.ts

@@ -0,0 +1,67 @@
+const DEFAULT_ADMIN_HOST = "root.mohfarawati.de";
+const DEFAULT_ADMIN_URL = `https://${DEFAULT_ADMIN_HOST}`;
+const DEFAULT_SITE_URL = "https://mohfarawati.de";
+
+export const INTERNAL_ADMIN_PREFIX = "/_admin";
+
+function normalizePathname(pathname: string): string {
+  if (!pathname || pathname === "/") {
+    return "/";
+  }
+
+  return pathname.startsWith("/") ? pathname : `/${pathname}`;
+}
+
+function normalizeBaseUrl(url: string): string {
+  return url.replace(/\/+$/, "");
+}
+
+export function getAdminHost(): string {
+  return (process.env.ADMIN_HOST ?? DEFAULT_ADMIN_HOST).trim().toLowerCase();
+}
+
+export function getRequestHostname(hostHeader?: string | null): string {
+  return (hostHeader ?? "")
+    .split(",")[0]
+    ?.trim()
+    .toLowerCase()
+    .replace(/:\d+$/, "") ?? "";
+}
+
+export function isAdminHost(hostname: string): boolean {
+  return hostname === getAdminHost();
+}
+
+export function isLegacyAdminPath(pathname: string): boolean {
+  return pathname === "/root" || pathname.startsWith("/root/");
+}
+
+export function isInternalAdminPath(pathname: string): boolean {
+  return pathname === INTERNAL_ADMIN_PREFIX || pathname.startsWith(`${INTERNAL_ADMIN_PREFIX}/`);
+}
+
+export function toInternalAdminPath(pathname: string): string {
+  const normalizedPathname = normalizePathname(pathname);
+
+  if (normalizedPathname === "/") {
+    return INTERNAL_ADMIN_PREFIX;
+  }
+
+  return `${INTERNAL_ADMIN_PREFIX}${normalizedPathname}`;
+}
+
+export function getAdminBaseUrl(): string {
+  return normalizeBaseUrl(process.env.NEXT_PUBLIC_ADMIN_URL ?? DEFAULT_ADMIN_URL);
+}
+
+export function buildAdminUrl(pathname = "/"): string {
+  return `${getAdminBaseUrl()}${normalizePathname(pathname)}`;
+}
+
+export function getSiteBaseUrl(): string {
+  return normalizeBaseUrl(process.env.NEXT_PUBLIC_SITE_URL ?? DEFAULT_SITE_URL);
+}
+
+export function buildSiteUrl(pathname = "/"): string {
+  return `${getSiteBaseUrl()}${normalizePathname(pathname)}`;
+}