/*
 * IpMe - A self-hosted API for obtaining your public IP address.
 * Copyright (C) 2023 Foster Hangdaan <foster@hangdaan.email>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <https://www.gnu.org/licenses/>.
*/

import { getVersion } from "./utils/app.ts";

const port = Number(Deno.env.get("PORT")) || 8000;

const ROOT_PATTERN = new URLPattern({ pathname: "/" });

const handler = (req: Request): Response => {
  const rootMatch = ROOT_PATTERN.exec(req.url);

  if (rootMatch && req.method === "GET") {
    const clientIpAddress = req.headers.get("x-forwarded-for")?.split(",").shift() || req.headers.get("host");
    const url = new URL(req.url);
    const format = url.searchParams.get("format");

    if (format === "json") {
      return new Response(JSON.stringify({ ip: clientIpAddress }), {
        headers: {
          "content-type": "application/json",
        },
      });
    } else {
      return new Response(clientIpAddress);
    }
  } else {
    return new Response("Not found", { status: 404 });
  }
};

console.log("IpMe - A self-hosted API for obtaining your public IP address.")
console.log(`Version: ${getVersion()}`);
console.log("Source Code: https://code.fosterhangdaan.com/foster/ipme")
console.log("License: GNU AGPL (version 3 or later)")

Deno.serve({ port }, handler);