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| pragma solidity 0.6.2;
import './THXCTokenInterface.sol';
import './SafeMath.sol';
contract Escrow {
using SafeMath for uint256;
event IntermediateStorage(string _url, string _hash);
event Pending(string manifest, string hash);
event BulkTransfer(uint256 indexed _txId, uint256 _bulkCount);
enum EscrowStatuses {
Launched,
Pending,
Partial,
Paid,
Complete,
Cancelled
}
EscrowStatuses public status;
address public reputationOracle;
address public recordingOracle;
address public launcher;
address payable public canceler;
uint256 public reputationOracleStake;
uint256 public recordingOracleStake;
uint256 private constant BULK_MAX_VALUE = 1000000000 * (10 ** 18);
uint32 private constant BULK_MAX_COUNT = 100;
address public eip20;
string public manifestUrl;
string public manifestHash;
string public finalResultsUrl;
string public finalResultsHash;
uint256 public duration;
uint256[] public finalAmounts;
bool public bulkPaid;
mapping(address => bool) public areTrustedHandlers;
constructor(
address _eip20,
address payable _canceler,
uint256 _duration,
address[] memory _handlers
) public {
eip20 = _eip20;
status = EscrowStatuses.Launched;
duration = _duration.add(block.timestamp); // solhint-disable-line not-rely-on-time
launcher = msg.sender;
canceler = _canceler;
areTrustedHandlers[_canceler] = true;
areTrustedHandlers[msg.sender] = true;
addTrustedHandlers(_handlers);
}
function getBalance() public view returns (uint256) {
return THXCTokenInterface(eip20).balanceOf(address(this));
}
function addTrustedHandlers(address[] memory _handlers) public {
require(
areTrustedHandlers[msg.sender],
'Address calling cannot add trusted handlers'
);
for (uint256 i = 0; i < _handlers.length; i++) {
areTrustedHandlers[_handlers[i]] = true;
}
}
// The escrower puts the Token in the contract without an agentless
// and assigsn a reputation oracle to payout the bounty of size of the
// amount specified
function setup(
address _reputationOracle,
address _recordingOracle,
uint256 _reputationOracleStake,
uint256 _recordingOracleStake,
string memory _url,
string memory _hash
) public trusted notExpired {
require(
_reputationOracle != address(0),
'Invalid or missing token spender'
);
require(
_recordingOracle != address(0),
'Invalid or missing token spender'
);
uint256 totalStake = _reputationOracleStake.add(_recordingOracleStake);
require(totalStake >= 0 && totalStake <= 100, 'Stake out of bounds');
require(
status == EscrowStatuses.Launched,
'Escrow not in Launched status state'
);
reputationOracle = _reputationOracle;
recordingOracle = _recordingOracle;
areTrustedHandlers[reputationOracle] = true;
areTrustedHandlers[recordingOracle] = true;
reputationOracleStake = _reputationOracleStake;
recordingOracleStake = _recordingOracleStake;
manifestUrl = _url;
manifestHash = _hash;
status = EscrowStatuses.Pending;
emit Pending(manifestUrl, manifestHash);
}
function abort() public trusted notComplete notPaid {
if (getBalance() != 0) {
cancel();
}
selfdestruct(canceler);
}
function cancel()
public
trusted
notBroke
notComplete
notPaid
returns (bool)
{
bool success = THXCTokenInterface(eip20).transfer(canceler, getBalance());
status = EscrowStatuses.Cancelled;
return success;
}
function complete() public notExpired {
require(
msg.sender == reputationOracle || areTrustedHandlers[msg.sender],
'Address calling is not trusted'
);
require(status == EscrowStatuses.Paid, 'Escrow not in Paid state');
status = EscrowStatuses.Complete;
}
function storeResults(
string memory _url,
string memory _hash
) public trusted notExpired {
require(
status == EscrowStatuses.Pending ||
status == EscrowStatuses.Partial,
'Escrow not in Pending or Partial status state'
);
emit IntermediateStorage(_url, _hash);
}
function bulkPayOut(
address[] memory _recipients,
uint256[] memory _amounts,
string memory _url,
string memory _hash,
uint256 _txId
) public trusted notBroke notLaunched notPaid notExpired returns (bool) {
require(
_recipients.length == _amounts.length,
"Amount of recipients and values don't match"
);
require(_recipients.length < BULK_MAX_COUNT, 'Too many recipients');
uint256 balance = getBalance();
bulkPaid = false;
uint256 aggregatedBulkAmount = 0;
for (uint256 i; i < _amounts.length; i++) {
aggregatedBulkAmount += _amounts[i];
}
require(aggregatedBulkAmount < BULK_MAX_VALUE, 'Bulk value too high');
if (balance < aggregatedBulkAmount) {
return bulkPaid;
}
bool writeOnchain = bytes(_hash).length != 0 || bytes(_url).length != 0;
if (writeOnchain) {
// Be sure they are both zero if one of them is
finalResultsUrl = _url;
finalResultsHash = _hash;
}
(
uint256 reputationOracleFee,
uint256 recordingOracleFee
) = finalizePayouts(_amounts);
THXCTokenInterface token = THXCTokenInterface(eip20);
for (uint i = 0; i < _recipients.length; ++i) {
token.transfer(_recipients[i], finalAmounts[i]);
}
delete finalAmounts;
bulkPaid =
token.transfer(reputationOracle, reputationOracleFee) &&
token.transfer(recordingOracle, recordingOracleFee);
balance = getBalance();
if (bulkPaid) {
if (status == EscrowStatuses.Pending) {
status = EscrowStatuses.Partial;
}
if (balance == 0 && status == EscrowStatuses.Partial) {
status = EscrowStatuses.Paid;
}
}
emit BulkTransfer(_txId, _recipients.length);
return bulkPaid;
}
function finalizePayouts(
uint256[] memory _amounts
) internal returns (uint256, uint256) {
uint256 reputationOracleFee = 0;
uint256 recordingOracleFee = 0;
for (uint256 j; j < _amounts.length; j++) {
uint256 singleReputationOracleFee = reputationOracleStake
.mul(_amounts[j])
.div(100);
uint256 singleRecordingOracleFee = recordingOracleStake
.mul(_amounts[j])
.div(100);
uint256 amount = _amounts[j].sub(singleReputationOracleFee).sub(
singleRecordingOracleFee
);
reputationOracleFee = reputationOracleFee.add(
singleReputationOracleFee
);
recordingOracleFee = recordingOracleFee.add(
singleRecordingOracleFee
);
finalAmounts.push(amount);
}
return (reputationOracleFee, recordingOracleFee);
}
modifier trusted() {
require(areTrustedHandlers[msg.sender], 'Address calling not trusted');
_;
}
modifier notBroke() {
require(getBalance() != 0, 'EIP20 contract out of funds');
_;
}
modifier notComplete() {
require(
status != EscrowStatuses.Complete,
'Escrow in Complete status state'
);
_;
}
modifier notPaid() {
require(status != EscrowStatuses.Paid, 'Escrow in Paid status state');
_;
}
modifier notLaunched() {
require(
status != EscrowStatuses.Launched,
'Escrow in Launched status state'
);
_;
}
modifier notExpired() {
require(duration > block.timestamp, 'Contract expired'); // solhint-disable-line not-rely-on-time
_;
}
}
|