supabase-middleware.ts

import { NextResponse, type NextRequest } from 'next/server'
import { createServerClient } from '@supabase/ssr'

export async function updateSession(request: NextRequest) {
  const requestHeaders = new Headers(request.headers)
  requestHeaders.set('X-Pathname', request.nextUrl.pathname)

  let supabaseResponse = NextResponse.next({
    request: {
      headers: requestHeaders
    }
  })

  const supabase = createServerClient(
    process.env.NEXT_PUBLIC_SUPABASE_URL!,
    process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY!,
    {
      cookies: {
        getAll() {
          return request.cookies.getAll()
        },
        setAll(cookiesToSet) {
          cookiesToSet.forEach(({ name, value }) => request.cookies.set(name, value))
          supabaseResponse = NextResponse.next({
            request
          })
          cookiesToSet.forEach(({ name, value, options }) =>
            supabaseResponse.cookies.set(name, value, options)
          )
        }
      }
    }
  )

  const {
    data: { user }
  } = await supabase.auth.getUser()

  if (!user) {
    const url = request.nextUrl.clone()
    url.pathname = '/'
    return NextResponse.redirect(url)
  }

  return supabaseResponse
}