ipme/main.ts

/*
 * 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");

    switch (format) {
      case "json": {
        return new Response(JSON.stringify({ ip: clientIpAddress }), {
          headers: {
            "content-type": "application/json",
          },
        });
      }
      case "jsonp": {
        const parameter = JSON.stringify({ ip: clientIpAddress });
        const callback = url.searchParams.get("callback") || "callback";
        return new Response(`${callback}(${parameter});`, {
          headers: {
            "content-type": "application/javascript",
          },
        });
      }
      default: {
        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.hangdaan.com/foster/ipme");
console.log("License: GNU AGPL (version 3 or later)");

Deno.serve({ port }, handler);