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* Copyright (c) 2018-present, Leap DAO (leapdao.org)
*
* This source code is licensed under the Mozilla Public License Version 2.0
* found in the LICENSE file in the root directory of this source tree.
*/
const { Type, Output } = require('leap-core');
const Transaction = require('ethereumjs-tx');
const VM = require('ethereumjs-vm');
const utils = require('ethereumjs-util');
const isEqual = require('lodash/isEqual');
const getColors = require('../../api/methods/getColors');
const {
NFT_COLOR_BASE,
NST_COLOR_BASE,
} = require('../../api/methods/constants');
const {
ERC20_BYTECODE,
ERC721_BYTECODE,
ERC1948_BYTECODE,
ERC1948_BYTECODE_218508104,
} = require('./ercBytecode');
const { isNFT, isNST } = require('./../../utils');
const { Account } = VM.deps;
const REACTOR_ADDR = Buffer.from(
'0000000000000000000000000000000000000001',
'hex'
);
const ERC20_MINT_FUNCSIG = Buffer.from(
'40c10f19000000000000000000000000',
'hex'
);
const ERC721_MINT_FUNCSIG = Buffer.from(
'40c10f19000000000000000000000000',
'hex'
);
const ERC1948_MINT_FUNCSIG = Buffer.from(
'1e458bee000000000000000000000000',
'hex'
);
// increaseAllowance(address spender, uint256 addedValue)
const ERC20_INCREASE_ALLOWANCE_FUNCSIG = Buffer.from(
'39509351000000000000000000000000',
'hex'
);
// approve(address to, uint256 tokenId)
const ERC721_APPROVE_FUNCSIG = Buffer.from(
'095ea7b3000000000000000000000000',
'hex'
);
const ERC20_ERC721_TRANSFER_EVENT = Buffer.from(
'ddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef',
'hex'
);
const ERC1948_DATA_UPDATED_EVENT = Buffer.from(
'8ec06c2117d45dcb6bcb6ecf8918414a7ff1cb1ed07da8175e2cf638d0f4777f',
'hex'
);
// 6 mil as gas limit
const GAS_LIMIT = 6000000n;
const GAS_LIMIT_HEX = `0x${GAS_LIMIT.toString(16)}`;
// fixed value until we get support for it in the transaction format
const FIXED_GAS_PRICE = 142n;
const iterateBag = (tokenBag, cb) => {
Object.entries(tokenBag).forEach(([originAddr]) => {
Object.entries(tokenBag[originAddr]).forEach(([owner, value]) => {
cb(originAddr, owner, value);
});
});
};
function setAccount(account, address, stateManager) {
return new Promise((resolve, reject) => {
stateManager.putAccount(address, account, err => {
Iif (err) {
return reject(err);
}
return resolve();
});
});
}
function setAccountCode(code, address, stateManager) {
return new Promise((resolve, reject) => {
stateManager.putContractCode(address, code, err => {
Iif (err) {
return reject(err);
}
return resolve();
});
});
}
// runs a transaction through the vm
function runTx(vm, raw, from) {
// create a new transaction out of the js object
const tx = new Transaction(raw);
Object.defineProperty(tx, 'from', {
// instead of tx.sign(Buffer.from(secretKey, 'hex'))
// eslint-disable-next-line object-shorthand
get() {
return from || REACTOR_ADDR;
},
});
return new Promise((resolve, reject) => {
// run the tx \o/
vm.runTx({ tx }, (err, results) => {
Iif (err) {
return reject(err);
}
if (results.vm && results.vm.exceptionError) {
const rv = results.vm.exceptionError;
rv.gasUsed = results.vm.gasUsed.toString(10);
rv.logs = results.vm.logs;
rv.return = results.vm.return;
return reject(rv);
}
return resolve(results);
});
});
}
const addColors = (map, colors, colorBase = 0) => {
colors.forEach((color, i) => {
map[i + colorBase] = Buffer.from(color.replace('0x', ''), 'hex');
});
};
module.exports = async (state, tx, bridgeState, nodeConfig = {}) => {
Iif (tx.type !== Type.SPEND_COND) {
throw new Error('Spending Condition tx expected');
}
if (nodeConfig.network && nodeConfig.network.noSpendingConditions) {
throw new Error('Spending Conditions are not supported on this network');
}
// colorMap for a color to address mapping
const colorMap = {};
addColors(colorMap, await getColors(bridgeState, false), 0);
addColors(colorMap, await getColors(bridgeState, true), NFT_COLOR_BASE);
addColors(
colorMap,
await getColors(bridgeState, false, true),
NST_COLOR_BASE
);
const toMint = [];
const LEAPTokenColor = 0;
const txInputLen = tx.inputs.length;
// signature for replay protection
const sigHashBuf = tx.sigHashBuf();
let spendingInput;
let spendingInputUnspent;
let spendingAddrBuf;
let spendingAddress;
// this is a bag of N(F/S)Ts to remember and update owners
const nftBag = {};
// this is a bag of ERC20s to help transform inputs to outputs
const tokenBag = {};
for (let i = 0; i < txInputLen; i += 1) {
const input = tx.inputs[i];
const unspent = state.unspent[input.prevout.hex()];
Iif (!unspent) {
throw new Error(`unspent: ${input.prevout.hex()} does not exists`);
}
const tokenValueBuf = utils.setLengthLeft(
utils.toBuffer(`0x${BigInt(unspent.value).toString(16)}`),
32
);
const contractAddr = colorMap[unspent.color];
const contractAddrStr = `0x${contractAddr.toString('hex')}`;
if (isNFT(unspent.color) || isNST(unspent.color)) {
const tokenId = `0x${tokenValueBuf.toString('hex')}`;
nftBag[contractAddrStr] = !nftBag[contractAddrStr]
? {}
: nftBag[contractAddrStr];
nftBag[contractAddrStr][tokenId] = {
addr: unspent.address,
touched: false,
};
} else if (i > 0) {
tokenBag[contractAddrStr] = !tokenBag[contractAddrStr]
? {}
: tokenBag[contractAddrStr];
Eif (!tokenBag[contractAddrStr][unspent.address]) {
tokenBag[contractAddrStr][unspent.address] = BigInt(unspent.value);
} else {
tokenBag[contractAddrStr][unspent.address] += BigInt(unspent.value);
}
}
Iif (!contractAddr) {
// just to make sure
throw new Error(`No contract for color: ${unspent.color}`);
}
if (input.script) {
Iif (!input.msgData) {
throw new Error('You need to supply both the script and message data');
}
// For now we require LEAP token (color = 0) for paying gas.
// In the future we may want a new transaction type for
// proposing other tokens to be eligible for paying gas to a specifiec ratio to
// the LEAP token.
if (unspent.color !== LEAPTokenColor) {
throw new Error('Only color 0 is supported to pay for gas right now.');
}
// TODO:
// we only allow one spending condition in an transaction, do we want to throw if we find more?
spendingInput = input;
spendingInputUnspent = unspent;
spendingAddrBuf = utils.ripemd160(spendingInput.script);
spendingAddress = `0x${spendingAddrBuf.toString('hex')}`;
// continue, input of spending condition is just for gas and will not be minted
// but any leftover after subtracting gas is returned to the owner as the last output.
// eslint-disable-next-line no-continue
continue;
}
// XXX: owner
let addrBuf = Buffer.from(unspent.address.replace('0x', ''), 'hex');
const spendingIsOwner = addrBuf.equals(spendingAddrBuf);
let callData;
let bytecode;
let allowance;
if (!spendingIsOwner) {
Iif (input.signer && unspent.address !== input.signer) {
throw new Error(
`output owner ${unspent.address} unequal input signer: ${input.signer}`
);
}
// will throw if allowance is undefined
// stricter rule was introduced here
// https://github.com/leapdao/leap-node/blob/b534718807214318acaa6a9ff88b9cb8f1780ef1/src/tx/applyTx/checkSpendCond.js#L271
Eif (bridgeState.flags.spend_cond_stricter_rules) {
if (input.signer) {
allowance = {};
}
} else {
allowance = {};
}
} else {
addrBuf = sigHashBuf;
}
if (isNST(unspent.color)) {
callData = Buffer.concat([
ERC1948_MINT_FUNCSIG,
addrBuf,
tokenValueBuf,
utils.toBuffer(unspent.data),
]);
bytecode = bridgeState.flags.spend_cond_new_bytecode
? ERC1948_BYTECODE
: ERC1948_BYTECODE_218508104;
if (allowance) {
allowance = {
from: addrBuf,
callData: Buffer.concat([
ERC721_APPROVE_FUNCSIG,
sigHashBuf,
tokenValueBuf,
]),
};
}
} else if (isNFT(unspent.color)) {
callData = Buffer.concat([ERC721_MINT_FUNCSIG, addrBuf, tokenValueBuf]);
bytecode = ERC721_BYTECODE;
if (allowance) {
allowance = {
from: addrBuf,
callData: Buffer.concat([
ERC721_APPROVE_FUNCSIG,
sigHashBuf,
tokenValueBuf,
]),
};
}
} else {
callData = Buffer.concat([ERC20_MINT_FUNCSIG, addrBuf, tokenValueBuf]);
bytecode = ERC20_BYTECODE;
if (allowance) {
allowance = {
from: addrBuf,
callData: Buffer.concat([
ERC20_INCREASE_ALLOWANCE_FUNCSIG,
sigHashBuf,
tokenValueBuf,
]),
};
}
}
toMint.push({
contractAddr,
callData,
bytecode,
color: unspent.color,
allowance,
});
}
// creating a new VM instance
const vm = new VM({ hardfork: 'petersburg' });
// deploy spending condition
await setAccountCode(spendingInput.script, sigHashBuf, vm.stateManager);
// creating the reactor account with some wei for minting
const reactorAccount = new Account();
reactorAccount.balance = '0xf00000000000000001';
await setAccount(reactorAccount, REACTOR_ADDR, vm.stateManager);
// for deploying colors and mint tokens
let nonceCounter = 0;
// keep track of deployed contracts
const deployed = {};
const nonces = {};
// now deploy the contracts and mint all tokens
while (toMint.length) {
const obj = toMint.pop();
const addrHex = obj.contractAddr.toString('hex');
if (deployed[`0x${addrHex}`] === undefined) {
deployed[`0x${addrHex}`] = obj.color;
// eslint-disable-next-line no-await-in-loop
await setAccountCode(obj.bytecode, obj.contractAddr, vm.stateManager);
}
// eslint-disable-next-line no-await-in-loop
await runTx(vm, {
nonce: nonceCounter,
gasLimit: GAS_LIMIT_HEX,
to: obj.contractAddr,
data: obj.callData,
});
nonceCounter += 1;
// for approval / allowance
if (obj.allowance) {
const owner = obj.allowance.from.toString('hex');
// eslint-disable-next-line no-bitwise
const nonce = nonces[owner] | 0;
if (nonce === 0) {
const acc = new Account();
acc.balance = '0xf00000000000000001';
// eslint-disable-next-line no-await-in-loop
await setAccount(acc, obj.allowance.from, vm.stateManager);
}
// eslint-disable-next-line no-await-in-loop
await runTx(
vm,
{
nonce,
gasLimit: GAS_LIMIT_HEX,
to: obj.contractAddr,
data: obj.allowance.callData,
},
obj.allowance.from
);
// update nonce
nonces[owner] = nonce + 1;
}
}
// need to commit to trie, needs a checkpoint first 🤪
await new Promise(resolve => {
vm.stateManager.checkpoint(() => {
vm.stateManager.commit(() => {
resolve();
});
});
});
let evmResult;
try {
evmResult = await runTx(vm, {
nonce: nonceCounter,
gasLimit: GAS_LIMIT_HEX, // TODO: set gas Limit to (inputs - outputs) / gasPrice
to: sigHashBuf,
// NOPE: the plasma address is replaced with sighash, to prevent replay attacks
data: spendingInput.msgData,
});
} catch (err) {
if (err.return && err.return.length > 0) {
// https://github.com/ethereum/EIPs/issues/838
err.return = bridgeState.web3.eth.abi.decodeParameter(
'string',
err.return.slice(4).toString('hex')
);
}
throw err;
}
const logOuts = [];
// iterate through all events
(evmResult.vm.logs || []).forEach(log => {
const originAddr = `0x${log[0].toString('hex')}`;
const topics = log[1];
const data = log[2];
const originColor = deployed[originAddr];
Iif (originColor === undefined) {
return;
}
if (isNST(originColor) && topics[0].equals(ERC1948_DATA_UPDATED_EVENT)) {
const nstTokenId = `0x${topics[1].toString('hex')}`;
// const nstFromData = data.slice(0, 32);
const nstToData = `0x${data.slice(32, 64).toString('hex')}`;
const tokenOwner = nftBag[originAddr][nstTokenId].addr;
logOuts.push(
new Output(BigInt(nstTokenId), tokenOwner, originColor, nstToData)
);
nftBag[originAddr][nstTokenId].touched = true;
return;
}
if (topics[0].equals(ERC20_ERC721_TRANSFER_EVENT)) {
let fromAddr = topics[1].slice(12, 32);
let toAddr = topics[2].slice(12, 32);
const tokenId =
isNFT(originColor) || isNST(originColor)
? `0x${topics[3].toString('hex')}`
: null;
// replace injected sigHash with plasma address
if (toAddr.equals(sigHashBuf)) {
toAddr = spendingAddress;
} else {
toAddr = `0x${toAddr.toString('hex')}`;
}
if (fromAddr.equals(sigHashBuf)) {
fromAddr = spendingAddress;
} else {
fromAddr = `0x${fromAddr.toString('hex')}`;
}
// todo: support transfer of ERC1948
if (!isNFT(originColor) && data.length === 0) {
// this hack assumes that an ERC1949 is minted
// and that Transfer Event is emmited before UpdateData Event
// so it only puts the new owner into the nftBag
nftBag[originAddr][tokenId] = {
addr: toAddr,
touched: true,
};
return;
}
// ? ERC721(tokenId) : ERC20(transferAmount)
const transferAmount = isNFT(originColor)
? BigInt(tokenId)
: BigInt(`0x${data.toString('hex')}`);
if (isNFT(originColor) || isNST(originColor)) {
logOuts.push(new Output(transferAmount, toAddr, originColor));
nftBag[originAddr][tokenId].touched = true;
} else {
tokenBag[originAddr][fromAddr] -= transferAmount;
if (!tokenBag[originAddr][toAddr]) {
tokenBag[originAddr][toAddr] = 0n;
}
tokenBag[originAddr][toAddr] += transferAmount;
}
}
});
// itterate over tokenBag, add all leftovers to outputs
iterateBag(tokenBag, (originAddr, owner, amount) => {
if (amount > 0n) {
logOuts.push(new Output(amount, owner, deployed[originAddr]));
}
});
Eif (bridgeState.flags.spend_cond_stricter_rules) {
iterateBag(nftBag, (originAddr, owner) => {
if (!nftBag[originAddr][owner].touched) {
// throw instead of return, because of the cb function
throw new Error(`not touched ${nftBag[originAddr][owner].addr}`);
}
});
}
const gasUsed = BigInt(evmResult.gasUsed);
// XXX: Fixed gasPrice for now. We include it again in the tx format as the next breaking change.
const gasPrice = FIXED_GAS_PRICE;
const minGasPrice = BigInt(
bridgeState.minGasPrices[bridgeState.minGasPrices.length - 1]
);
Iif (gasPrice < minGasPrice) {
return Promise.reject(
new Error(
`tx gasPrice ${gasPrice.toString()} less than minGasPrice: ${minGasPrice.toString()}`
)
);
}
const gasChange = BigInt(spendingInputUnspent.value) - gasPrice * gasUsed;
Iif (gasChange < 0n) {
throw new Error(
'Not enough input for spending condition to cover gas costs'
);
}
// Now return the leftovers
logOuts.push(
new Output(
gasChange,
spendingInputUnspent.address,
spendingInputUnspent.color
)
);
// TODO: compact logOuts
if (!isEqual(tx.outputs, logOuts)) {
const txOuts = tx.outputs
.map(output => JSON.stringify(output.toJSON()))
.join(',');
const logs = logOuts
.map(output => JSON.stringify(output.toJSON()))
.join(',');
const err = new Error(
`outputs do not match computation results. \n outputs ${txOuts} \n calculated: ${logs}`
);
err.logOuts = logOuts;
return Promise.reject(err);
}
bridgeState.logsCache[tx.hash()] = evmResult.vm.logs;
return Promise.resolve(logOuts);
};
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