site/middleware.js

import { NextResponse } from 'next/server'
import country from 'country-list-js'
const partners = ['gb_help_desk']

export function middleware(request) {
  if (request.nextUrl.pathname.startsWith('/slack')) {
    let url = request.nextUrl
    if (!url.searchParams.get('continent')) {
      let continent = country.findByIso2(request.geo.country || 'AU').continent
      if (continent === 'Oceania') {
        continent = 'Australia'
      }
      url.searchParams.set('continent', continent)
      return NextResponse.redirect(url)
    }
  }
}