nostr-tools/nip47.ts

import {finishEvent} from './event.ts'
import {encrypt} from './nip04.ts'
import {Kind} from './event'

export function parseConnectionString(connectionString: string) {
  const {pathname, searchParams} = new URL(connectionString)
  const pubkey = pathname
  const relay = searchParams.get('relay')
  const secret = searchParams.get('secret')

  if (!pubkey || !relay || !secret) {
    throw new Error('invalid connection string')
  }

  return {pubkey, relay, secret}
}

export async function makeNwcRequestEvent({
  pubkey,
  secret,
  invoice
}: {
  pubkey: string
  secret: string
  invoice: string
}) {
  const content = {
    method: 'pay_invoice',
    params: {
      invoice
    }
  }
  const encryptedContent = await encrypt(
    secret,
    pubkey,
    JSON.stringify(content)
  )
  const eventTemplate = {
    kind: Kind.NwcRequest,
    created_at: Math.round(Date.now() / 1000),
    content: encryptedContent,
    tags: [['p', pubkey]]
  }

  return finishEvent(eventTemplate, secret)
}