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const {
TransactionBuilder,
Keypair,
BASE_FEE,
Operation,
Asset
} = require('stellar-sdk')
const cors = require('cors')
const { json } = require('body-parser')
const multer = require('multer')
const express = require('@runkit/tyvdh/express-endpoint/1.0.0')
const sendError = require('@runkit/tyvdh/send-error/1.0.1')
const setupStellarNetwork = require('@runkit/tyvdh/setup-stellar-network/1.0.0')
const app = express(exports)
const upload = multer()
app.use(cors())
app.use(json())
app.post('/', upload.single('png'), async (req, res) => {
try {
const { network } = req.body
const { buffer } = req.file
let png = buffer.toString('base64')
const { server, networkPassphrase } = setupStellarNetwork(network)
const BADGE_SEK = req.headers['X-BADGE'] || req.headers['x-badge']
const badgeKeypair = Keypair.fromSecret(BADGE_SEK)
const badgePublicKey = badgeKeypair.publicKey()
const ROOT_SEK = req.headers['X-ROOT'] || req.headers['x-root']
const rootKeypair = Keypair.fromSecret(ROOT_SEK)
const rootPublicKey = rootKeypair.publicKey()
const SIGNER_PUK = req.headers['X-SIGNER'] || req.headers['x-signer']
const SIGNER_SEK = req.headers['X-SIGNER'] || req.headers['x-signer']
const signerKeypair = Keypair.fromSecret(SIGNER_SEK)
const signerPublicKey = signerKeypair.publicKey()
const transaction = await server.loadAccount(rootPublicKey)
.then((account) => {
let transaction = new TransactionBuilder(account, {
fee: BASE_FEE,
networkPassphrase,
})
.setTimeout(0)
let i = 0
transaction.addOperation(Operation.payment({
destination: badgePublicKey,
source: rootPublicKey,
amount: '0.5',
asset: Asset.native(),
}))
transaction.addOperation(Operation.setOptions({
masterWeight: 0,
lowThreshold: 1,
medThreshold: 1,
highThreshold: 1,
signer: {
ed25519PublicKey: SIGNER_PUK,
weight: 1
},
source: badgePublicKey
}))
while (png.length) {
const name = `${String(i).padStart(2, '0')}${png.substr(0, 62)}`
const value = png.substr(62, 64) || '='
transaction.addOperation(Operation.payment({
destination: badgePublicKey,
source: rootPublicKey,
amount: '0.5',
asset: Asset.native(),
}))
transaction.addOperation(Operation.manageData({
name,
value,
source: badgePublicKey
}))
png = png.substr(62 + 64)
i++
}
transaction = transaction.build()
transaction.sign(
badgeKeypair,
signerKeypair,
rootKeypair,
)
return transaction
})
res.send(transaction.toXDR())
}
catch(err) {
sendError(err, res)
}
})
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