index.ts

import path from "node:path";

function getPacketLength(packet: string) {
  const hex = "0123456789abcdef";
  const length = packet.length + 4;

  let prefix = hex[(length >> 12) & 0xf];
  prefix += hex[(length >> 8) & 0xf];
  prefix += hex[(length >> 4 & 0xf)];
  prefix += hex[length & 0xf];

  return prefix;
}

const server = Bun.serve({
  async fetch(request, server) {
    const reqURL = new URL(request.url);
    const repoPath = path.join(__dirname, "repo");

    switch (reqURL.pathname) {
      case "/info/refs":
        const service = reqURL.searchParams.get("service");
        const firstLine = `# service=${service}\n`;
        const infoRefs = await Bun.$`${service} --stateless-rpc --advertise-refs ${repoPath}`.text();
        return new Response(`${getPacketLength(firstLine)}${firstLine}0000${infoRefs}`, {
          headers: {
            "Cache-Control": "no-cache, max-age=0, must-revalidate",
            "Content-Type": `application/x-${service}-advertisement`,
            Expires: "Fri, 01 Jan 1980 00:00:00 GMT",
            Pragma: "no-cache"
          }
        });

      case "/git-receive-pack":
        const payload = await Bun.readableStreamToArrayBuffer(request.body as ReadableStream);
        const commitPayload = await (await Bun.$`git receive-pack --stateless-rpc ${repoPath} < ${payload}`).stdout;
        return new Response(commitPayload, {
          headers: {
            "Cache-Control": "no-cache, max-age=0, must-revalidate",
            "Content-Type": "application/x-git-receive-pack-result",
            Expires: "Fri, 01 Jan 1980 00:00:00 GMT",
            Pragma: "no-cache"
          }
        });

      case "/git-upload-pack":
        const payload2 = await Bun.readableStreamToArrayBuffer(request.body as ReadableStream);
        const pullPayload = await (await Bun.$`git upload-pack --stateless-rpc ${repoPath} < ${payload2}`).stdout;
        return new Response(pullPayload, {
          headers: {
            "Cache-Control": "no-cache, max-age=0, must-revalidate",
            "Content-Type": "application/x-git-upload-pack-result",
            Expires: "Fri, 01 Jan 1980 00:00:00 GMT",
            Pragma: "no-cache"
          }
        });
    }

    return new Response("", { status: 404 });
  }
});

console.log(`listen http://${server.hostname}:${server.port}`);