link-stack/apps/link/middleware.ts

import { NextResponse } from 'next/server';
import type { NextRequest } from 'next/server';
import { withAuth, NextRequestWithAuth } from "next-auth/middleware";

const rewriteURL = (request: NextRequest, originBaseURL: string, destinationBaseURL: string, headers: any = {}) => {
  if (request.nextUrl.pathname.includes('/_next/static/development/')) {
    return NextResponse.next();
  }

  const destinationURL = request.url.replace(originBaseURL, destinationBaseURL);
  console.log(`Rewriting ${request.url} to ${destinationURL}`);

const requestHeaders = new Headers(request.headers);
for (const [key, value] of Object.entries(headers)) {
// @ts-ignore
  requestHeaders.set(key, value);
}

requestHeaders.delete('connection');

console.log({finalHeaders: requestHeaders});

  return NextResponse.rewrite(new URL(destinationURL), { request: { headers: requestHeaders } });
};

const checkRewrites = async (request: NextRequestWithAuth) => {
console.log({currentURL: request.nextUrl.href});

  const linkBaseURL = "http://localhost:3000";
  const zammadURL = "http://zammad-nginx:8080";
  if (request.nextUrl.pathname.startsWith('/proxy/leafcutter')) {
    return rewriteURL(request, linkBaseURL, "http://leafcutter:3000");
  } else if (request.nextUrl.pathname.startsWith('/proxy/metamigo')) {
    return rewriteURL(request, linkBaseURL, "http://metamigo:3000");
  } else if (request.nextUrl.pathname.startsWith('/proxy/zammad')) {
console.log('proxying to zammad');
    const { token } = request.nextauth;

	console.log({nextauth: request.nextauth});

    const headers = {
      'X-Forwarded-User': token.email.toLowerCase(),
      host: 'link-stack-dev.digiresilience.org'
    };

console.log({headers});

    return rewriteURL(request, `${linkBaseURL}/proxy/zammad`, zammadURL, headers);
  } else if (request.nextUrl.pathname.startsWith('/assets') || request.nextUrl.pathname.startsWith('/api/v1')) {
    console.log('asset');
    return rewriteURL(request, linkBaseURL, zammadURL);
  } else if (request.nextUrl.pathname.startsWith('/proxy/assets')) {
    console.log('proxy asset');
    return rewriteURL(request, `${linkBaseURL}/proxy`, zammadURL);
  } else if (request.nextUrl.pathname.startsWith('/proxy/api')) {
    console.log('proxy api');
    return rewriteURL(request, `${linkBaseURL}/proxy`, zammadURL);
  }
};

export default withAuth(
  checkRewrites,
  {
    pages: {
      signIn: `/login`,
    },
    callbacks: {
      authorized: ({ token, req }) => {
        const {
          url,
          headers,
        } = req;

        // check login page
        const parsedURL = new URL(url);
        if (parsedURL.pathname.startsWith('/login')) {
          return true;
        }

        // check session auth
        const authorizedDomains = ["redaranj.com", "digiresilience.org"];
        const userDomain = token?.email?.toLowerCase().split("@").pop() ?? "unauthorized.net";

        if (authorizedDomains.includes(userDomain)) {
          return true;
        }

        return false;
      },
    }
  }
);