import json from typing import Any, Awaitable, Callable, List, Optional from fastapi import WebSocket from loguru import logger from .crud import ( create_event, delete_events, get_config_for_all_active_relays, get_event, get_events, mark_events_deleted, ) from .models import ClientConfig, NostrEvent, NostrEventType, NostrFilter, RelayConfig class NostrClientManager: def __init__(self: "NostrClientManager"): self._clients: dict = {} self._active_relays: dict = {} self._is_ready = False async def add_client(self, c: "NostrClientConnection") -> bool: if not self._is_ready: await self.init_relays() if not (await self._allow_client(c)): return False self._set_client_callbacks(c) self.clients(c.relay_id).append(c) return True def remove_client(self, c: "NostrClientConnection"): self.clients(c.relay_id).remove(c) async def broadcast_event(self, source: "NostrClientConnection", event: NostrEvent): for client in self.clients(source.relay_id): if client != source: await client.notify_event(event) async def init_relays(self): self._active_relays = await get_config_for_all_active_relays() self._is_ready = True async def enable_relay(self, relay_id: str, config: RelayConfig): self._is_ready = True self._active_relays[relay_id] = config async def disable_relay(self, relay_id: str): await self._stop_clients_for_relay(relay_id) if relay_id in self._active_relays: del self._active_relays[relay_id] def get_relay_config(self, relay_id: str) -> RelayConfig: return self._active_relays[relay_id] def clients(self, relay_id: str) -> List["NostrClientConnection"]: if relay_id not in self._clients: self._clients[relay_id] = [] return self._clients[relay_id] async def _stop_clients_for_relay(self, relay_id: str): for client in self.clients(relay_id): if client.relay_id == relay_id: await client.stop(reason=f"Relay '{relay_id}' has been deactivated.") async def _allow_client(self, c: "NostrClientConnection") -> bool: if c.relay_id not in self._active_relays: await c.stop(reason=f"Relay '{c.relay_id}' is not active") return False #todo: NIP-42: AUTH return True def _set_client_callbacks(self, client): setattr(client, "broadcast_event", self.broadcast_event) def get_client_config() -> ClientConfig: return self.get_relay_config(client.relay_id) setattr(client, "get_client_config", get_client_config) class NostrClientConnection: def __init__(self, relay_id: str, websocket: WebSocket): self.websocket = websocket self.relay_id = relay_id self.filters: List[NostrFilter] = [] self.broadcast_event: Optional[Callable[[NostrClientConnection, NostrEvent], Awaitable[None]]] = None self.get_client_config: Optional[Callable[[], ClientConfig]] = None async def start(self): await self.websocket.accept() while True: json_data = await self.websocket.receive_text() try: data = json.loads(json_data) resp = await self._handle_message(data) for r in resp: await self._send_msg(r) except Exception as e: logger.warning(e) async def stop(self, reason: Optional[str]): message = reason if reason else "Server closed webocket" try: await self._send_msg(["NOTICE", message]) except: pass try: await self.websocket.close(reason=reason) except: pass async def notify_event(self, event: NostrEvent) -> bool: for filter in self.filters: if filter.matches(event): resp = event.serialize_response(filter.subscription_id) await self._send_msg(resp) return True return False async def _broadcast_event(self, e: NostrEvent): if self.broadcast_event: await self.broadcast_event(self, e) async def _handle_message(self, data: List) -> List: if len(data) < 2: return [] message_type = data[0] if message_type == NostrEventType.EVENT: await self._handle_event(NostrEvent.parse_obj(data[1])) return [] if message_type == NostrEventType.REQ: if len(data) != 3: return [] return await self._handle_request(data[1], NostrFilter.parse_obj(data[2])) if message_type == NostrEventType.CLOSE: self._handle_close(data[1]) return [] async def _handle_event(self, e: NostrEvent): resp_nip20: List[Any] = ["OK", e.id] if not self.client_config.is_author_allowed(e.pubkey): resp_nip20 += [False, f"Public key '{e.pubkey}' is not allowed in relay '{self.relay_id}'!"] await self._send_msg(resp_nip20) return None try: e.check_signature() except ValueError as ex: resp_nip20 += [False, "invalid: wrong event `id` or `sig`"] await self._send_msg(resp_nip20) return None try: if e.is_replaceable_event(): await delete_events( self.relay_id, NostrFilter(kinds=[e.kind], authors=[e.pubkey]) ) await create_event(self.relay_id, e) await self._broadcast_event(e) if e.is_delete_event(): await self._handle_delete_event(e) resp_nip20 += [True, ""] except Exception as ex: logger.debug(ex) event = await get_event(self.relay_id, e.id) # todo: handle NIP20 in detail message = "error: failed to create event" resp_nip20 += [event != None, message] await self._send_msg(resp_nip20) @property def client_config(self) -> ClientConfig: if not self.get_client_config: raise Exception("Client not ready!") return self.get_client_config() async def _send_msg(self, data: List): await self.websocket.send_text(json.dumps(data)) async def _handle_delete_event(self, event: NostrEvent): # NIP 09 filter = NostrFilter(authors=[event.pubkey]) filter.ids = [t[1] for t in event.tags if t[0] == "e"] events_to_delete = await get_events(self.relay_id, filter, False) ids = [e.id for e in events_to_delete if not e.is_delete_event()] await mark_events_deleted(self.relay_id, NostrFilter(ids=ids)) async def _handle_request(self, subscription_id: str, filter: NostrFilter) -> List: filter.subscription_id = subscription_id self.remove_filter(subscription_id) self.filters.append(filter) events = await get_events(self.relay_id, filter) serialized_events = [ event.serialize_response(subscription_id) for event in events ] resp_nip15 = ["EOSE", subscription_id] serialized_events.append(resp_nip15) return serialized_events def _handle_close(self, subscription_id: str): self.remove_filter(subscription_id) def remove_filter(self, subscription_id: str): self.filters = [f for f in self.filters if f.subscription_id != subscription_id]