# rxprotoplex-peers

A robust library for managing WebSocket and WebRTC signaling, socket multiplexing, and peer-to-peer communication. Designed with a reactive architecture leveraging RxJS and Protoplex, `rxprotoplex-peers` simplifies complex networking scenarios.

## Alpha !!!
Testing and implementation of ping-pong (or user-supplied) mechanisms for connection health are still in the works.

Additionally, a dependency has been flagged for potential SSRF vulnerabilities due to the `ip` package. However, this library does not utilize the problematic feature, and this is not a concern for most use cases.

---

## Table of Contents

- [Installation](#installation)
- [Usage](#usage)
  - [WebSocket Network Interfaces](#websocket-network-interfaces)
    - [addWebSocketNetworkInterface](#addwebsocketnetworkinterface)
    - [closeInterface](#closeinterface)
    - [selectInterfaceByIp$](#selectinterfacebyip)
    - [networkInterfaceConnected$](#networkinterfaceconnected)
  - [WebRTC Signaling](#webrtc-signaling)
    - [webrtcSignalingRelay](#webrtcsignalingrelay)
  - [Socket Management](#socket-management)
    - [connect](#connect)
    - [listenOnSocket$](#listenonsocket)
    - [connectStream$](#connectstream)
    - [closeSocket](#closesocket)
    - [closeSocketsOfNetworkInterface](#closesocketsofnetworkinterface)
  - [WebSocket Utilities](#websocket-utilities)
    - [webSocketServer](#websocketserver)
    - [getWebSocketURL](#getwebsocketurl)
  - [Helper Methods](#helper-methods)
    - [idOf](#idof)
    - [receiveIce](#receiveice)
- [License](#license)

---

## Installation

Install this library using your preferred package manager:

```bash
npm install rxprotoplex-peers
```

---

## Usage

### WebSocket Network Interfaces

#### `addWebSocketNetworkInterface`

Adds a WebSocket network interface for communication.

```javascript
const nicId = addWebSocketNetworkInterface(url, config);
```

**Parameters:**
- `url` (string): The WebSocket server URL.
- `config` (object): Configuration options for the network interface.

**Returns:**
- `string`: The ID of the created network interface.

---

#### `closeInterface`

Closes a WebSocket network interface and all associated sockets.

```javascript
closeInterface(interfaceId, error);
```

**Parameters:**
- `interfaceId` (string | object): The interface ID or object to close.
- `error` (Error, optional): Error to propagate during closure.

---

#### `selectInterfaceByIp$`

Observable that emits the interface matching the specified IP.

```javascript
selectInterfaceByIp$(ip).subscribe(iface => console.log(iface));
```

**Parameters:**
- `ip` (string): The IP address to search for.

**Returns:**
- `Observable<object>`: Emits the matching interface.

---

#### `networkInterfaceConnected$`

Emits when a network interface is connected and verified.

```javascript
networkInterfaceConnected$(id).subscribe(iface => console.log('Connected:', iface));
```

**Parameters:**
- `id` (string): The ID of the network interface.

**Returns:**
- `Observable<object>`: Emits the connected and verified interface.

---

### WebRTC Signaling

#### `webrtcSignalingRelay`

Manages WebRTC signaling and ICE candidate relaying.

```javascript
const signaling = webrtcSignalingRelay(peerManager, socket);
```

**Parameters:**
- `peerManager` (object): Manages peer connections.
- `socket` (object): Associated socket instance.

**Returns:**
- `object`: WebRTC signaling methods as RPC.

---

### Socket Management

#### `connect`

Establishes a connection between two interfaces.

```javascript
connect(localIp, remoteIp);
```

**Parameters:**
- `localIp` (string): Local interface IP.
- `remoteIp` (string): Remote interface IP.

---

#### `listenOnSocket$`

Listens on a specific channel for incoming connections.

```javascript
listenOnSocket$(ip, channel).subscribe(socket => console.log(socket));
```

**Parameters:**
- `ip` (string): IP address to listen on.
- `channel` (string): Communication channel.

**Returns:**
- `Observable<object>`: Emits incoming socket connections.

---

#### `connectStream$`

Connects to a remote socket over a specific channel.

```javascript
connectStream$(remoteIp, channel).subscribe(stream => stream.write('Hello'));
```

**Parameters:**
- `remoteIp` (string): Remote socket IP.
- `channel` (string): Communication channel.

**Returns:**
- `Observable<object>`: Emits the connected stream.

---

#### `closeSocket`

Closes a specific socket.

```javascript
closeSocket(socketId, error);
```

**Parameters:**
- `socketId` (string | object): Socket ID or object.
- `error` (Error, optional): Error to propagate during closure.

---

#### `closeSocketsOfNetworkInterface`

Closes all sockets associated with a specific network interface.

```javascript
closeSocketsOfNetworkInterface(interfaceId, error);
```

**Parameters:**
- `interfaceId` (string): Network interface ID.
- `error` (Error, optional): Error to propagate during closure.

---

### WebSocket Utilities

#### `webSocketServer`

Sets up a WebSocket server for managing connections.

```javascript
webSocketServer(wss);
```

**Parameters:**
- `wss` (WebSocketServer): WebSocket server instance.

---

#### `getWebSocketURL`

Generates a WebSocket URL for a server.

```javascript
const url = getWebSocketURL(wss);
```

**Parameters:**
- `wss` (WebSocketServer): WebSocket server instance.

**Returns:**
- `string`: WebSocket URL.

---

### Helper Methods

#### `idOf`

Retrieves the ID of an entity.

```javascript
const id = idOf(entity);
```

**Parameters:**
- `entity` (object): Entity object.

**Returns:**
- `string`: Entity ID.

---

#### `receiveIce`

Processes and applies an ICE candidate.

```javascript
receiveIce(socketIp, candidate);
```

**Parameters:**
- `socketIp` (string): Sending socket IP.
- `candidate` (object): ICE candidate data.

---

## License

This library is licensed under the [MIT License](LICENSE).