Function extractSubdomain

middleware.ts:4–41

(request: NextRequest)

import { rootDomain } from '@/lib/utils';

function extractSubdomain(request: NextRequest): string | null {
  const url = request.url;
  const host = request.headers.get('host') || '';
  const hostname = host.split(':')[0];

  // Local development environment
  if (url.includes('localhost') || url.includes('127.0.0.1')) {
    // Try to extract subdomain from the full URL
    const fullUrlMatch = url.match(/http:\/\/([^.]+)\.localhost/);
    if (fullUrlMatch && fullUrlMatch[1]) {
      return fullUrlMatch[1];
    }

    // Fallback to host header approach
    if (hostname.includes('.localhost')) {
      return hostname.split('.')[0];
    }

    return null;
  }

  // Production environment
  const rootDomainFormatted = rootDomain.split(':')[0];

  // Handle preview deployment URLs (tenant---branch-name.vercel.app)
  if (hostname.includes('---') && hostname.endsWith('.vercel.app')) {
    const parts = hostname.split('---');
    return parts.length > 0 ? parts[0] : null;
  }

  // Regular subdomain detection
  const isSubdomain =
    hostname !== rootDomainFormatted &&
    hostname !== `www.${rootDomainFormatted}` &&
    hostname.endsWith(`.${rootDomainFormatted}`);

  return isSubdomain ? hostname.replace(`.${rootDomainFormatted}`, '') : null;
}

export async function middleware(request: NextRequest) {
  const { pathname } = request.nextUrl;