middleware.ts

import type { NextFetchEvent } from 'next/server';
import { fetchDataViaGet, fetchDataViaPost } from '#/api/utils';
import { API_URL } from '#/api/config';

export const config = {
  matcher: '/api/proxy/:path*',
};

export default async function middleware(request: Request, context: NextFetchEvent) {
  if (request.method == "GET") {
    const url = new URL(request.url);
    const isApiV2 = url.searchParams.get("API-Version") == "v2" || false;
    if (isApiV2) {
      url.searchParams.delete("API-Version");
    }
    const path = url.pathname.match(/\/api\/proxy\/(.*)/)?.[1] + url.search

    const data = await fetchDataViaGet(`${API_URL}/${path}`, isApiV2);

    if (!data) {
      return new Response(JSON.stringify({ message: "Error Fetching Data" }), {
        status: 500,
        headers: {
          'Content-Type': 'application/json',
        },
      });
    }

    return new Response(JSON.stringify(data), {
      status: 200,
      headers: {
        'Content-Type': 'application/json',
      },
    });
  }

  if (request.method == "POST") {
    const url = new URL(request.url);
    const isApiV2 = url.searchParams.get("API-Version") == "v2" || false;
    if (isApiV2) {
      url.searchParams.delete("API-Version");
    }
    const path = url.pathname.match(/\/api\/proxy\/(.*)/)?.[1] + url.search

    const ReqContentTypeHeader = request.headers.get("Content-Type") || "";
    let ResContentTypeHeader = "";
    let body = null;

    if (ReqContentTypeHeader.split(";")[0] == "multipart/form-data") {
      ResContentTypeHeader = ReqContentTypeHeader;
      body = await request.arrayBuffer();
    } else {
      ResContentTypeHeader = "application/json; charset=UTF-8";
      body = JSON.stringify(await request.json());
    }

    const data = await fetchDataViaPost(`${API_URL}/${path}`, body, isApiV2, ResContentTypeHeader);

    if (!data) {
      return new Response(JSON.stringify({ message: "Error Fetching Data" }), {
        status: 500,
        headers: {
          'Content-Type': 'application/json',
        },
      });
    }

    return new Response(JSON.stringify(data), {
      status: 200,
      headers: {
        'Content-Type': 'application/json',
      },
    });
  }
}