stacker.news/pages/api/lnurlp/[username]/pay.js

97 lines
4.0 KiB
JavaScript

import models from '../../../../api/models'
import lnd from '../../../../api/lnd'
import { createInvoice } from 'ln-service'
import { lnurlPayDescriptionHashForUser, lnurlPayMetadataString, lnurlPayDescriptionHash } from '../../../../lib/lnurl'
import serialize from '../../../../api/resolvers/serial'
import { schnorr } from '@noble/curves/secp256k1'
import { createHash } from 'crypto'
import { datePivot } from '../../../../lib/time'
import { BALANCE_LIMIT_MSATS, INV_PENDING_LIMIT, LNURLP_COMMENT_MAX_LENGTH } from '../../../../lib/constants'
import { ssValidate, lud18PayerDataSchema } from '../../../../lib/validate'
import assertGofacYourself from '../../../../api/resolvers/ofac'
export default async ({ query: { username, amount, nostr, comment, payerdata: payerData }, headers }, res) => {
const user = await models.user.findUnique({ where: { name: username } })
if (!user) {
return res.status(400).json({ status: 'ERROR', reason: `user @${username} does not exist` })
}
try {
await assertGofacYourself({ models, headers })
// if nostr, decode, validate sig, check tags, set description hash
let description, descriptionHash, noteStr
if (nostr) {
noteStr = decodeURIComponent(nostr)
const note = JSON.parse(noteStr)
// It MUST have only one p tag
const hasPTag = note.tags?.filter(t => t[0] === 'p').length === 1
// It MUST have 0 or 1 e tags
const hasETag = note.tags?.filter(t => t[0] === 'e').length <= 1
// If there is an amount tag, it MUST be equal to the amount query parameter
const eventAmount = note.tags?.find(t => t[0] === 'amount')?.[1]
if (schnorr.verify(note.sig, note.id, note.pubkey) && hasPTag && hasETag && (!eventAmount || Number(eventAmount) === Number(amount))) {
description = user.hideInvoiceDesc ? undefined : 'zap'
descriptionHash = createHash('sha256').update(noteStr).digest('hex')
} else {
res.status(400).json({ status: 'ERROR', reason: 'invalid NIP-57 note' })
return
}
} else {
description = user.hideInvoiceDesc ? undefined : `Funding @${username} on stacker.news`
descriptionHash = lnurlPayDescriptionHashForUser(username)
}
if (!amount || amount < 1000) {
return res.status(400).json({ status: 'ERROR', reason: 'amount must be >=1000 msats' })
}
if (comment && comment.length > LNURLP_COMMENT_MAX_LENGTH) {
return res.status(400).json({ status: 'ERROR', reason: `comment cannot exceed ${LNURLP_COMMENT_MAX_LENGTH} characters in length` })
}
let parsedPayerData
if (payerData) {
try {
parsedPayerData = JSON.parse(payerData)
} catch (err) {
console.error('failed to parse payerdata', err)
return res.status(400).json({ status: 'ERROR', reason: 'Invalid JSON supplied for payerdata parameter' })
}
try {
await ssValidate(lud18PayerDataSchema, parsedPayerData)
} catch (err) {
console.error('error validating payer data', err)
return res.status(400).json({ status: 'ERROR', reason: err.toString() })
}
// Update description hash to include the passed payer data
const metadataStr = `${lnurlPayMetadataString(username)}${payerData}`
descriptionHash = lnurlPayDescriptionHash(metadataStr)
}
// generate invoice
const expiresAt = datePivot(new Date(), { minutes: 1 })
const invoice = await createInvoice({
description,
description_hash: descriptionHash,
lnd,
mtokens: amount,
expires_at: expiresAt
})
await serialize(models,
models.$queryRaw`SELECT * FROM create_invoice(${invoice.id}, ${invoice.request},
${expiresAt}::timestamp, ${Number(amount)}, ${user.id}::INTEGER, ${noteStr || description},
${comment || null}, ${parsedPayerData || null}::JSONB, ${INV_PENDING_LIMIT}::INTEGER, ${BALANCE_LIMIT_MSATS})`)
return res.status(200).json({
pr: invoice.request,
routes: []
})
} catch (error) {
console.log(error)
res.status(400).json({ status: 'ERROR', reason: 'could not generate invoice' })
}
}