stacker.news/pages/api/lnwith.js

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// verify k1 exists
// send back
import models from '../../api/models'
import getSSRApolloClient from '../../api/ssrApollo'
import { CREATE_WITHDRAWL } from '../../fragments/wallet'
export default async ({ query }, res) => {
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if (!query.k1) {
return res.status(400).json({ status: 'ERROR', reason: 'k1 not provided' })
}
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if (query.pr) {
return doWithdrawal(query, res)
}
let reason
try {
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const lnwith = await models.lnWith.findFirst({
where: {
k1: query.k1,
createdAt: {
gt: new Date(new Date().setHours(new Date().getHours() - 1))
}
}
})
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if (lnwith) {
const user = await models.user.findUnique({ where: { id: lnwith.userId } })
if (user) {
return res.status(200).json({
tag: 'withdrawRequest', // type of LNURL
callback: process.env.LNWITH_URL, // The URL which LN SERVICE would accept a withdrawal Lightning invoice as query parameter
k1: query.k1, // Random or non-random string to identify the user's LN WALLET when using the callback URL
defaultDescription: `Withdrawal for @${user.name} on SN`, // A default withdrawal invoice description
minWithdrawable: 1000, // Min amount (in millisatoshis) the user can withdraw from LN SERVICE, or 0
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maxWithdrawable: Number(user.msats - 10000n) // Max amount (in millisatoshis) the user can withdraw from LN SERVICE, or equal to minWithdrawable if the user has no choice over the amounts
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})
} else {
reason = 'user not found'
}
} else {
reason = 'withdrawal not found'
}
} catch (error) {
console.log(error)
reason = 'internal server error'
}
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console.log(reason)
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return res.status(400).json({ status: 'ERROR', reason })
}
async function doWithdrawal (query, res) {
const lnwith = await models.lnWith.findUnique({ where: { k1: query.k1 } })
if (!lnwith) {
return res.status(400).json({ status: 'ERROR', reason: 'invalid k1' })
}
const me = await models.user.findUnique({ where: { id: lnwith.userId } })
if (!me) {
return res.status(400).json({ status: 'ERROR', reason: 'user not found' })
}
// create withdrawal in gql
const client = await getSSRApolloClient({ me })
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const { error, data } = await client.mutate({
mutation: CREATE_WITHDRAWL,
variables: { invoice: query.pr, maxFee: 10 }
})
if (error || !data?.createWithdrawl) {
return res.status(400).json({ status: 'ERROR', reason: error?.toString() || 'could not generate withdrawl' })
}
// store withdrawal id lnWith so client can show it
await models.lnWith.update({ where: { k1: query.k1 }, data: { withdrawalId: Number(data.createWithdrawl.id) } })
return res.status(200).json({ status: 'OK' })
}