43 lines
1.2 KiB
JavaScript
43 lines
1.2 KiB
JavaScript
let bigInt = require('snarkjs/src/bigint')
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const utils = require('../scripts/utils')
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const express = require('express')
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const app = express()
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app.use(express.json())
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const Web3 = require('web3')
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const web3 = new Web3('http://localhost:8545', null, { transactionConfirmationBlocks: 1 })
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const contractJson = require('../build/contracts/Mixer.json')
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let netId = 42
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const mixer = new web3.eth.Contract(contractJson.abi, contractJson.networks[netId].address)
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function getMinimumFee() {
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// todo calc acceptable fee
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return 1e16
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}
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app.post('/deposit', async (req, resp) => {
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let proof = req.body
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if (!(proof.pi_a && proof.pi_b && proof.pi_c && proof.publicSignals)) { // check that it's kinda well formed
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resp.status(400).end()
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}
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if (bigInt(proof.publicSignals[3]) < getMinimumFee()) {
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resp.status(403).send('Fee is too low')
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}
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if (!utils.snarkVerify(proof)) {
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resp.status(403).send('Invalid snark proof')
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}
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try {
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let receipt = await mixer.withdraw(proof.pi_a, proof.pi_b, proof.pi_b, proof.publicSignals)
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console.log(receipt)
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resp.send({ transaction: receipt.transactionHash })
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} catch (e) {
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console.log(e)
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resp.status(400).send('Transaction was reverted')
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}
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})
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app.listen(3000)
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