A example of Middleware function to rewrite seasonal url based on user location

middlewarefunctionrewriteseasonalurl

import { NextResponse } from 'next/server';
import type { NextRequest } from 'next/server';

// Trigger this middleware to run on the `/seasonal` route
export const config = {
  matcher: '/seasonal',
};

/**
 ** Middleware Function to rewrite seasonal url based on user geo location
 * @param req 
 * @returns NextResponse with a rewrite set  
 */
export function middleware(req: NextRequest) {
  // Extract country from Request Geo object. Default to US if not found and write to console
  const country = (req.geo && req.geo.country) || 'US';
  console.log(`Visitor from ${country}`);

  // Extract Latitude from request Geo object and determine Hemisphere
  const hemisphere = (req.geo && req.geo.latitude) as any > 0 ? 'Northern' : 'Southern';
  console.log(`Visitor located in ${hemisphere} Hemisphere`);
  
  // Obtain Season using Visitor Hemisphere  
  let season = getSeason(hemisphere);
  req.nextUrl.pathname = `/seasonal/${season}`;
  console.log(`Rewrite path based on Visitor season: ${req.nextUrl.pathname}`);

  // Rewrite URL to personalize visitor journey based on season
  return NextResponse.rewrite(req.nextUrl);
}
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