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transfer!

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This commit is contained in:
Alexey 2020-04-09 23:08:16 +03:00
parent 0edd6d237c
commit 4c510b186a
1 changed files with 84 additions and 11 deletions
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95
src/index.js
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@ -1,3 +1,4 @@
/* eslint-disable no-console */
const MerkleTree = require('../lib/merkleTree')
const fs = require('fs')
const { bigInt, stringifyBigInts } = require('snarkjs')
@ -25,7 +26,7 @@ const toHex = (number, length = 32) => '0x' + (number instanceof Buffer ? number
function merklePathIndicesToBigint(indexArray) {
let result = 0
for(let item of indexArray.slice().reverse()) {
result = (result << 1) + item
result = (result << 1) + item
}
return result
}
@ -59,7 +60,7 @@ function createOutput(amount, pubkey) {
return createUtxo(amount, rbigint(), pubkey)
}
function createInput(amount, blinding, pubkey, privkey, merklePathIndices, merklePathElements) {
function createInput({ amount, blinding, pubkey, privkey, merklePathIndices, merklePathElements }) {
return createUtxo(amount, blinding, pubkey, privkey, merklePathIndices, merklePathElements)
}
@ -73,11 +74,13 @@ function createUtxo(amount, blinding, pubkey, privkey, merklePathIndices, merkle
return utxo
}
function createDeposit(amount, pubkey) {
const keypair = randomKeypair()
function createDeposit(amount, keypair) {
const fakeKeypair = randomKeypair()
const output = createOutput(amount, keypair.pubkey)
output.privkey = keypair.privkey
const tx = {
inputs: [createZeroUtxo(keypair), createZeroUtxo(keypair)],
outputs: [createOutput(amount, pubkey), createZeroUtxo(keypair)], // todo shuffle
inputs: [createZeroUtxo(fakeKeypair), createZeroUtxo(fakeKeypair)],
outputs: [output, createZeroUtxo(fakeKeypair)], // todo shuffle
}
return tx
}
@ -87,7 +90,8 @@ async function buildMerkleTree() {
const events = await contract.getPastEvents('NewCommitment', { fromBlock: 0, toBlock: 'latest' })
const leaves = events
.sort((a, b) => a.returnValues.index - b.returnValues.index) // todo sort by event date
.map(e => e.returnValues.commitment)
.map(e => toHex(e.returnValues.commitment))
console.log('leaves', leaves)
return new MerkleTree(MERKLE_TREE_HEIGHT, leaves)
}
@ -103,7 +107,7 @@ async function deposit() {
const tree = await buildMerkleTree()
const oldRoot = await tree.root()
const keypair = randomKeypair()
const tx = createDeposit(amount, keypair.pubkey)
const tx = createDeposit(amount, keypair)
await insertOutput(tree, tx.outputs[0])
await insertOutput(tree, tx.outputs[1])
console.log('Note', tx.outputs[0])
@ -135,7 +139,8 @@ async function deposit() {
outPathElements: tx.outputs[0].merklePathElements.slice(1)
}
console.log('input', JSON.stringify(stringifyBigInts(input)))
// console.log('input', JSON.stringify(stringifyBigInts(input)))
console.log('DEPOSIT input', input)
console.log('Generating SNARK proof...')
const proofData = await websnarkUtils.genWitnessAndProve(groth16, input, circuit, proving_key)
@ -155,10 +160,77 @@ async function deposit() {
console.log('Sending deposit transaction...')
const receipt = await contract.methods.transaction(proof, ...args).send({ value: amount, from: web3.eth.defaultAccount, gas: 1e6 })
console.log(`Receipt ${receipt.transactionHash}`)
return tx.outputs[0]
}
async function transact() {
async function transact(txOutput) {
console.log('txOutput', txOutput)
const tree = await buildMerkleTree()
const oldRoot = await tree.root()
const keypair = randomKeypair()
const index = await tree.getIndexByElement(toHex(txOutput.commitment))
console.log('index', index)
const { path_elements, path_index } = await tree.path(index)
console.log('path_index', path_index)
txOutput.merklePathElements = path_elements
const input1 = createInput(txOutput)
const tx = {
inputs: [input1, createZeroUtxo(fromPrivkey(txOutput.privkey))],
outputs: [createOutput(txOutput.amount / 4, keypair.pubkey), createOutput(txOutput.amount * 3 / 4, txOutput.pubkey)], // todo shuffle
}
await insertOutput(tree, tx.outputs[0])
await insertOutput(tree, tx.outputs[1])
console.log('Note', tx.outputs[0])
let input = {
root: oldRoot,
newRoot: await tree.root(),
inputNullifier: [tx.inputs[0].nullifier, tx.inputs[1].nullifier],
outputCommitment: [tx.outputs[0].commitment, tx.outputs[1].commitment],
extAmount: 0,
fee: 0,
recipient: 0,
relayer: 0,
// private inputs
privateKey: tx.inputs[0].privkey,
// data for 2 transaction inputs
inAmount: [tx.inputs[0].amount, tx.inputs[1].amount],
inBlinding: [tx.inputs[0].blinding, tx.inputs[1].blinding],
inPathIndices: [merklePathIndicesToBigint(tx.inputs[0].merklePathIndices), merklePathIndicesToBigint(tx.inputs[1].merklePathIndices)],
inPathElements: [tx.inputs[0].merklePathElements, tx.inputs[1].merklePathElements],
// data for 2 transaction outputs
outAmount: [tx.outputs[0].amount, tx.outputs[1].amount],
outBlinding: [tx.outputs[0].blinding, tx.outputs[1].blinding],
outPubkey: [tx.outputs[0].pubkey, tx.outputs[1].pubkey],
outPathIndices: merklePathIndicesToBigint(tx.outputs[0].merklePathIndices.slice(1)),
outPathElements: tx.outputs[0].merklePathElements.slice(1)
}
console.log('TRANSFER input', input)
console.log('Generating SNARK proof...')
const proofData = await websnarkUtils.genWitnessAndProve(groth16, input, circuit, proving_key)
const { proof } = websnarkUtils.toSolidityInput(proofData)
const args = [
toHex(input.root),
toHex(input.newRoot),
[toHex(tx.inputs[0].nullifier), toHex(tx.inputs[1].nullifier)],
[toHex(tx.outputs[0].commitment), toHex(tx.outputs[1].commitment)],
toHex(0),
toHex(input.fee),
toHex(input.recipient, 20),
toHex(input.relayer, 20),
]
console.log('Sending transfer transaction...')
const receipt = await contract.methods.transaction(proof, ...args).send({ from: web3.eth.defaultAccount, gas: 1e6 })
console.log(`Receipt ${receipt.transactionHash}`)
return tx.outputs[0]
}
async function main() {
@ -171,7 +243,8 @@ async function main() {
contract = new web3.eth.Contract(contractData.abi, contractData.networks[netId].address)
web3.eth.defaultAccount = (await web3.eth.getAccounts())[0]
await deposit()
const txOutput = await deposit()
const txOutput1 = await transact(txOutput)
}