#!/bin/sh
# Bridge: cursor-agent spawns this as a stdio MCP server. We connect to a
# per-session unix socket provided as $1 and tunnel newline-delimited
# JSON-RPC frames between cursor-agent's stdin/stdout and the proxy-owned
# socket server (which is the real MCP server).
#
# Uses Node (always available in the image) rather than nc, to avoid
# depending on netcat variants that may not support -U for unix sockets.
socket="$1"
if [ -z "$socket" ]; then
  echo "usage: $0 <socket-path>" >&2
  exit 1
fi

exec node -e '
const sock = process.argv[1];
if (!sock) { console.error("mcp-stdio-bridge: missing socket arg"); process.exit(1); }
const net = require("node:net");
const conn = net.createConnection(sock);
let buf = "";
process.stdin.setEncoding("utf8");
process.stdin.on("data", (chunk) => {
  // Forward as-is; JSON-RPC frames are newline-delimited on both sides.
  conn.write(chunk);
});
process.stdin.on("end", () => conn.end());
conn.setEncoding("utf8");
conn.on("data", (chunk) => process.stdout.write(chunk));
conn.on("end", () => process.exit(0));
conn.on("close", () => process.exit(0));
conn.on("error", (e) => {
  console.error("[mcp-stdio-bridge] socket error: " + e.message);
  process.exit(1);
});
process.on("SIGPIPE", () => process.exit(0));
' "$socket"