@bsv/authsocket/src/SocketServerTransport.ts

Mutually Authenticated Web Socket (Server-side)

import { Socket as IoSocket } from 'socket.io'
import { Transport, AuthMessage } from '@bsv/sdk'

/** 
 * Implements the Transport interface for a specific client socket.
 * 
 * This transport simply relays AuthMessages over 'authMessage'
 * in the underlying Socket.IO connection.
 */
export class SocketServerTransport implements Transport {
  private onDataCallback?: (message: AuthMessage) => Promise<void>

  constructor(private socket: IoSocket) { }

  async send(message: AuthMessage): Promise<void> {
    // We'll emit with a special low-level event named: 'authMessage'
    this.socket.emit('authMessage', message)
  }

  async onData(callback: (message: AuthMessage) => Promise<void>): Promise<void> {
    this.onDataCallback = callback
    // Listen for 'authMessage' from the client
    this.socket.on('authMessage', async (msg: AuthMessage) => {
      if (this.onDataCallback) {
        await this.onDataCallback(msg)
      }
    })
  }
}