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ForeignBridgeErcToNative.sol
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ForeignBridgeErcToNative.sol
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pragma solidity 0.4.24;
import "../BasicForeignBridge.sol";
import "../ERC20Bridge.sol";
import "../OtherSideBridgeStorage.sol";
import "../../interfaces/IScdMcdMigration.sol";
contract ForeignBridgeErcToNative is BasicForeignBridge, ERC20Bridge, OtherSideBridgeStorage {
event TokensSwapped(address indexed from, address indexed to, uint256 value);
bytes32 internal constant MIN_HDTOKEN_BALANCE = 0x48649cf195feb695632309f41e61252b09f537943654bde13eb7bb1bca06964e; // keccak256(abi.encodePacked("minHDTokenBalance"))
bytes4 internal constant SWAP_TOKENS = 0x73d00224; // swapTokens()
function initialize(
address _validatorContract,
address _erc20token,
uint256 _requiredBlockConfirmations,
uint256 _gasPrice,
uint256[] _dailyLimitMaxPerTxMinPerTxArray, // [ 0 = _dailyLimit, 1 = _maxPerTx, 2 = _minPerTx ]
uint256[] _homeDailyLimitHomeMaxPerTxArray, //[ 0 = _homeDailyLimit, 1 = _homeMaxPerTx ]
address _owner,
uint256 _decimalShift,
address _bridgeOnOtherSide
) external returns (bool) {
require(!isInitialized());
require(AddressUtils.isContract(_validatorContract));
require(_requiredBlockConfirmations != 0);
require(_gasPrice > 0);
require(
_dailyLimitMaxPerTxMinPerTxArray[2] > 0 && // _minPerTx > 0
_dailyLimitMaxPerTxMinPerTxArray[1] > _dailyLimitMaxPerTxMinPerTxArray[2] && // _maxPerTx > _minPerTx
_dailyLimitMaxPerTxMinPerTxArray[0] > _dailyLimitMaxPerTxMinPerTxArray[1] // _dailyLimit > _maxPerTx
);
require(_homeDailyLimitHomeMaxPerTxArray[1] < _homeDailyLimitHomeMaxPerTxArray[0]); // _homeMaxPerTx < _homeDailyLimit
require(_owner != address(0));
require(_bridgeOnOtherSide != address(0));
addressStorage[VALIDATOR_CONTRACT] = _validatorContract;
setErc20token(_erc20token);
uintStorage[DEPLOYED_AT_BLOCK] = block.number;
uintStorage[REQUIRED_BLOCK_CONFIRMATIONS] = _requiredBlockConfirmations;
uintStorage[GAS_PRICE] = _gasPrice;
uintStorage[DAILY_LIMIT] = _dailyLimitMaxPerTxMinPerTxArray[0];
uintStorage[MAX_PER_TX] = _dailyLimitMaxPerTxMinPerTxArray[1];
uintStorage[MIN_PER_TX] = _dailyLimitMaxPerTxMinPerTxArray[2];
uintStorage[EXECUTION_DAILY_LIMIT] = _homeDailyLimitHomeMaxPerTxArray[0];
uintStorage[EXECUTION_MAX_PER_TX] = _homeDailyLimitHomeMaxPerTxArray[1];
uintStorage[DECIMAL_SHIFT] = _decimalShift;
setOwner(_owner);
_setBridgeContractOnOtherSide(_bridgeOnOtherSide);
setInitialize();
emit RequiredBlockConfirmationChanged(_requiredBlockConfirmations);
emit GasPriceChanged(_gasPrice);
emit DailyLimitChanged(_dailyLimitMaxPerTxMinPerTxArray[0]);
emit ExecutionDailyLimitChanged(_homeDailyLimitHomeMaxPerTxArray[0]);
return isInitialized();
}
function getBridgeMode() external pure returns (bytes4 _data) {
return 0x18762d46; // bytes4(keccak256(abi.encodePacked("erc-to-native-core")))
}
function claimTokens(address _token, address _to) public {
require(_token != address(erc20token()));
if (_token == address(halfDuplexErc20token())) {
// SCD is not claimable if the bridge accepts deposits of this token
// solhint-disable-next-line not-rely-on-time
require(!isTokenSwapAllowed(now));
}
super.claimTokens(_token, _to);
}
function onExecuteMessage(
address _recipient,
uint256 _amount,
bytes32 /*_txHash*/
) internal returns (bool) {
setTotalExecutedPerDay(getCurrentDay(), totalExecutedPerDay(getCurrentDay()).add(_amount));
uint256 amount = _amount.div(10**decimalShift());
bool res = erc20token().transfer(_recipient, amount);
if (AddressUtils.isContract(halfDuplexErc20token()) && tokenBalance(halfDuplexErc20token()) > 0) {
address(this).call(abi.encodeWithSelector(SWAP_TOKENS));
}
return res;
}
function onFailedMessage(address, uint256, bytes32) internal {
revert();
}
function _relayTokens(address _sender, address _receiver, uint256 _amount) internal {
require(_receiver != bridgeContractOnOtherSide());
super._relayTokens(_sender, _receiver, _amount);
}
function migrateToMCD(address _migrationContract) external onlyOwner {
bytes32 storageAddress = 0x3378953eb16363e06fd9ea9701d36ed7285d206d9de7df55b778462d74596a89; // keccak256(abi.encodePacked("migrationToMcdCompleted"))
require(!boolStorage[storageAddress]);
require(AddressUtils.isContract(_migrationContract));
uint256 curBalance = erc20token().balanceOf(address(this));
require(erc20token().approve(_migrationContract, curBalance));
//It is important to note that this action will cause appearing of `Transfer`
//event as part of the tokens minting
IScdMcdMigration(_migrationContract).swapSaiToDai(curBalance);
address saiContract = erc20token();
address mcdContract = IDaiAdapter(IScdMcdMigration(_migrationContract).daiJoin()).dai();
setErc20token(mcdContract);
require(erc20token().balanceOf(address(this)) == curBalance);
emit TokensSwapped(saiContract, erc20token(), curBalance);
boolStorage[storageAddress] = true;
}
function saiTopContract() internal pure returns (ISaiTop) {
return ISaiTop(0x9b0ccf7C8994E19F39b2B4CF708e0A7DF65fA8a3);
}
function isTokenSwapAllowed(uint256 _ts) public view returns (bool) {
uint256 esTs = saiTopContract().caged();
if ((esTs > 0) && (_ts > esTs)) {
return false;
}
return true;
}
function halfDuplexErc20token() public pure returns (ERC20) {
return ERC20(0x89d24A6b4CcB1B6fAA2625fE562bDD9a23260359);
}
function setMinHDTokenBalance(uint256 _minBalance) external onlyOwner {
uintStorage[MIN_HDTOKEN_BALANCE] = _minBalance;
}
function minHDTokenBalance() public view returns (uint256) {
return uintStorage[MIN_HDTOKEN_BALANCE];
}
function isHDTokenBalanceAboveMinBalance() public view returns (bool) {
if (tokenBalance(halfDuplexErc20token()) > minHDTokenBalance()) {
return true;
}
return false;
}
function tokenBalance(ERC20 _token) internal view returns (uint256) {
return _token.balanceOf(address(this));
}
function migrationContract() internal pure returns (IScdMcdMigration) {
return IScdMcdMigration(0xc73e0383F3Aff3215E6f04B0331D58CeCf0Ab849);
}
function swapTokens() public {
// solhint-disable-next-line not-rely-on-time
require(isTokenSwapAllowed(now));
IScdMcdMigration mcdMigrationContract = migrationContract();
ERC20 hdToken = halfDuplexErc20token();
ERC20 fdToken = erc20token();
uint256 curHDTokenBalance = tokenBalance(hdToken);
require(curHDTokenBalance > 0);
uint256 curFDTokenBalance = tokenBalance(fdToken);
require(hdToken.approve(mcdMigrationContract, curHDTokenBalance));
mcdMigrationContract.swapSaiToDai(curHDTokenBalance);
require(tokenBalance(fdToken) - curFDTokenBalance == curHDTokenBalance);
emit TokensSwapped(hdToken, fdToken, curHDTokenBalance);
}
function relayTokens(address _from, address _receiver, uint256 _amount, address _token) external {
require(_from == msg.sender || _from == _receiver);
_relayTokens(_from, _receiver, _amount, _token);
}
function relayTokens(address _receiver, uint256 _amount, address _token) external {
_relayTokens(msg.sender, _receiver, _amount, _token);
}
function _relayTokens(address _sender, address _receiver, uint256 _amount, address _token) internal {
require(_receiver != bridgeContractOnOtherSide());
require(_receiver != address(0));
require(_receiver != address(this));
require(_amount > 0);
require(withinLimit(_amount));
ERC20 tokenToOperate = ERC20(_token);
ERC20 hdToken = halfDuplexErc20token();
ERC20 fdToken = erc20token();
if (tokenToOperate == ERC20(0x0)) {
tokenToOperate = fdToken;
}
require(tokenToOperate == fdToken || tokenToOperate == hdToken);
setTotalSpentPerDay(getCurrentDay(), totalSpentPerDay(getCurrentDay()).add(_amount));
tokenToOperate.transferFrom(_sender, address(this), _amount);
emit UserRequestForAffirmation(_receiver, _amount);
if (tokenToOperate == hdToken) {
swapTokens();
}
}
}