stacker.news/components/lightning-auth.js

import { gql, useMutation, useQuery } from '@apollo/client'
import { signIn } from 'next-auth/react'
import { useEffect } from 'react'
import Col from 'react-bootstrap/Col'
import Container from 'react-bootstrap/Container'
import Row from 'react-bootstrap/Row'
import AccordianItem from './accordian-item'
import Qr, { QrSkeleton } from './qr'
import styles from './lightning-auth.module.css'
import BackIcon from '@/svgs/arrow-left-line.svg'
import { useRouter } from 'next/router'
import { FAST_POLL_INTERVAL, SSR } from '@/lib/constants'

function QrAuth ({ k1, encodedUrl, callbackUrl, multiAuth }) {
  const query = gql`
  {
    lnAuth(k1: "${k1}") {
      pubkey
      k1
    }
  }`
  const { data } = useQuery(query, SSR ? {} : { pollInterval: FAST_POLL_INTERVAL, nextFetchPolicy: 'cache-and-network' })

  useEffect(() => {
    if (data?.lnAuth?.pubkey) {
      signIn('lightning', { ...data.lnAuth, callbackUrl, multiAuth })
    }
  }, [data?.lnAuth])

  useEffect(() => {
    if (typeof window.webln === 'undefined') return

    // optimistically use WebLN for authentication
    async function effect () {
      // this will also enable our WebLN wallet
      await window.webln.enable()
      await window.webln.lnurl(encodedUrl)
    }
    effect().catch(console.error)
  }, [encodedUrl])

  // output pubkey and k1
  return (
    <Qr value={encodedUrl} status='waiting for you' />
  )
}

function LightningExplainer ({ text, children }) {
  const router = useRouter()
  return (
    <Container>
      <div className={styles.login}>
        <div className='w-100 mb-3 text-muted pointer' onClick={() => router.back()}><BackIcon /></div>
        <h3 className='w-100 pb-2'>
          {text || 'Login'} with Lightning
        </h3>
        <div className='fw-bold text-muted pb-4'>This is the most private way to use Stacker News. Just open your Lightning wallet and scan the QR code.</div>
        <Row className='w-100 text-muted'>
          <Col className='ps-0 mb-4' md>
            <AccordianItem
              header={`Which wallets can I use to ${(text || 'Login').toLowerCase()}?`}
              body={
                <>
                  <Row className='mb-3 no-gutters'>
                    You can use any wallet that supports lnurl-auth. These are some wallets you can use:
                  </Row>
                  <Row>
                    <Col xs>
                      <ul className='mb-0'>
                        <li>Alby</li>
                        <li>Balance of Satoshis</li>
                        <li>Blixt</li>
                        <li>Breez</li>
                        <li>Blue Wallet</li>
                        <li>Coinos</li>
                        <li>LNBits</li>
                        <li>LNtxtbot</li>
                      </ul>
                    </Col>
                    <Col xs>
                      <ul>
                        <li>Phoenix</li>
                        <li>Simple Bitcoin Wallet</li>
                        <li>Sparrow Wallet</li>
                        <li>ThunderHub</li>
                        <li>Zap Desktop</li>
                        <li>Zeus</li>
                      </ul>
                    </Col>
                  </Row>
                </>
          }
            />
          </Col>
          <Col md className='mx-auto' style={{ maxWidth: '300px' }}>
            {children}
          </Col>
        </Row>
      </div>
    </Container>
  )
}

export function LightningAuthWithExplainer ({ text, callbackUrl, multiAuth }) {
  return (
    <LightningExplainer text={text}>
      <LightningAuth callbackUrl={callbackUrl} multiAuth={multiAuth} />
    </LightningExplainer>
  )
}

export function LightningAuth ({ callbackUrl, multiAuth }) {
  // query for challenge
  const [createAuth, { data, error }] = useMutation(gql`
    mutation createAuth {
      createAuth {
        k1
        encodedUrl
      }
    }`)

  useEffect(() => {
    createAuth()
  }, [])

  if (error) return <div>error</div>

  return data ? <QrAuth {...data.createAuth} callbackUrl={callbackUrl} multiAuth={multiAuth} /> : <QrSkeleton status='generating' />
}