init

gateway.py

@@ -0,0 +1,62 @@
+#!/usr/bin/env python3
+"""
+Minimal signaling server for NAT-traversal demos.
+Run:  python signaling.py           # listens on 0.0.0.0:8000
+Dependencies:  none (std-lib only).
+
+API
+----
+POST /register     JSON {"id": "...", "ip": "...", "port": int}
+GET  /peer/<id>    ->  JSON {"ip": "...", "port": int}
+
+Security, persistence, auth, etc. are intentionally *omitted*.
+"""
+
+from http.server import HTTPServer, BaseHTTPRequestHandler
+import json
+
+peers: dict[str, dict[str, str | int]] = {}        # in-memory registry
+
+
+class SignalingHandler(BaseHTTPRequestHandler):
+    def _json_response(self, code: int, payload: dict | str):
+        self.send_response(code)
+        self.send_header("Content-Type", "application/json")
+        self.end_headers()
+        body = payload if isinstance(payload, str) else json.dumps(payload)
+        self.wfile.write(body.encode())
+
+    # ---- POST /register ----------------------------------------------------
+    def do_POST(self):
+        if self.path != "/register":
+            self._json_response(404, {"error": "unknown endpoint"})
+            return
+
+        length = int(self.headers.get("Content-Length", 0))
+        try:
+            data = json.loads(self.rfile.read(length))
+            pid, ip, port = data["id"], data["ip"], int(data["port"])
+        except Exception as e:
+            self._json_response(400, {"error": f"bad json: {e}"})
+            return
+
+        peers[pid] = {"ip": ip, "port": port}
+        self._json_response(200, {"status": "ok"})
+
+    # ---- GET /peer/<id> ----------------------------------------------------
+    def do_GET(self):
+        if not self.path.startswith("/peer/"):
+            self._json_response(404, {"error": "unknown endpoint"})
+            return
+
+        pid = self.path[len("/peer/") :]
+        info = peers.get(pid)
+        if info is None:
+            self._json_response(404, {"error": f"peer '{pid}' not found"})
+        else:
+            self._json_response(200, info)
+
+
+if __name__ == "__main__":
+    print("🔥 Signaling server running on http://0.0.0.0:8000")
+    HTTPServer(("0.0.0.0", 8000), SignalingHandler).serve_forever()