Contract Source Code:
File 1 of 1 : BridgeEth
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/IERC20.sol)
pragma solidity ^0.8.0;
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves `amount` tokens from the caller's account to `to`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address to, uint256 amount) external returns (bool);
/**
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* zero by default.
*
* This value changes when {approve} or {transferFrom} are called.
*/
function allowance(address owner, address spender) external view returns (uint256);
/**
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* IMPORTANT: Beware that changing an allowance with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender's allowance to 0 and set the
* desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
* Emits an {Approval} event.
*/
function approve(address spender, uint256 amount) external returns (bool);
/**
* @dev Moves `amount` tokens from `from` to `to` using the
* allowance mechanism. `amount` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(
address from,
address to,
uint256 amount
) external returns (bool);
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
}
// File @openzeppelin/contracts/utils/[email protected]
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
pragma solidity ^0.8.0;
/**
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
}
// File @openzeppelin/contracts/access/[email protected]
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)
pragma solidity ^0.8.0;
/**
* @dev Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* specific functions.
*
* By default, the owner account will be the one that deploys the contract. This
* can later be changed with {transferOwnership}.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be applied to your functions to restrict their use to
* the owner.
*/
abstract contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor() {
_transferOwnership(_msgSender());
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view virtual returns (address) {
return _owner;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(owner() == _msgSender(), "Ownable: caller is not the owner");
_;
}
/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions anymore. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby removing any functionality that is only available to the owner.
*/
function renounceOwnership() public virtual onlyOwner {
_transferOwnership(address(0));
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
_transferOwnership(newOwner);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Internal function without access restriction.
*/
function _transferOwnership(address newOwner) internal virtual {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}
// File @openzeppelin/contracts/security/[email protected]
// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)
pragma solidity ^0.8.0;
/**
* @dev Contract module that helps prevent reentrant calls to a function.
*
* Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
* available, which can be applied to functions to make sure there are no nested
* (reentrant) calls to them.
*
* Note that because there is a single `nonReentrant` guard, functions marked as
* `nonReentrant` may not call one another. This can be worked around by making
* those functions `private`, and then adding `external` `nonReentrant` entry
* points to them.
*
* TIP: If you would like to learn more about reentrancy and alternative ways
* to protect against it, check out our blog post
* https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
*/
abstract contract ReentrancyGuard {
// Booleans are more expensive than uint256 or any type that takes up a full
// word because each write operation emits an extra SLOAD to first read the
// slot's contents, replace the bits taken up by the boolean, and then write
// back. This is the compiler's defense against contract upgrades and
// pointer aliasing, and it cannot be disabled.
// The values being non-zero value makes deployment a bit more expensive,
// but in exchange the refund on every call to nonReentrant will be lower in
// amount. Since refunds are capped to a percentage of the total
// transaction's gas, it is best to keep them low in cases like this one, to
// increase the likelihood of the full refund coming into effect.
uint256 private constant _NOT_ENTERED = 1;
uint256 private constant _ENTERED = 2;
uint256 private _status;
constructor() {
_status = _NOT_ENTERED;
}
/**
* @dev Prevents a contract from calling itself, directly or indirectly.
* Calling a `nonReentrant` function from another `nonReentrant`
* function is not supported. It is possible to prevent this from happening
* by making the `nonReentrant` function external, and making it call a
* `private` function that does the actual work.
*/
modifier nonReentrant() {
// On the first call to nonReentrant, _notEntered will be true
require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
// Any calls to nonReentrant after this point will fail
_status = _ENTERED;
_;
// By storing the original value once again, a refund is triggered (see
// https://eips.ethereum.org/EIPS/eip-2200)
_status = _NOT_ENTERED;
}
}
// File @chainlink/contracts/src/v0.8/interfaces/[email protected]
pragma solidity ^0.8.0;
interface AggregatorV3Interface {
function decimals() external view returns (uint8);
function description() external view returns (string memory);
function version() external view returns (uint256);
// getRoundData and latestRoundData should both raise "No data present"
// if they do not have data to report, instead of returning unset values
// which could be misinterpreted as actual reported values.
function getRoundData(uint80 _roundId)
external
view
returns (
uint80 roundId,
int256 answer,
uint256 startedAt,
uint256 updatedAt,
uint80 answeredInRound
);
function latestRoundData()
external
view
returns (
uint80 roundId,
int256 answer,
uint256 startedAt,
uint256 updatedAt,
uint80 answeredInRound
);
}
// File contracts/BridgeEth.sol
pragma solidity 0.8.7;
/** @title This bridge operates on the Binance Smart Chain blockchain. It locks BabyDoge, initiated by a user,
* and subject to a flat fee in BNB and a percentage fee in BabyDoge. Unlock is initiated through an external bot and
* processed on a different blockchain.
*/
contract BridgeEth is Ownable, ReentrancyGuard {
uint256 public nonce;
uint256 minimumUSD = 10 * 10 ** 18;
uint256 public feeReleaseThreshold = 0.1 ether;
mapping(IERC20 => TokenConfig) private _tokenConfig;
mapping(IERC20 => mapping(address => uint256)) private _balances;
mapping(uint256 => bool) private _processedNonces;
IERC20 private _sokuToken;
IERC20 private _sutekuToken;
bool public paused = false;
address payable private _unlocker_bot;
address private _pauser_bot;
uint256 constant private DAILY_TRANSFER_INTERVAL_ONE_DAY = 86400;
uint256 private _dailyTransferNextTimestamp = block.timestamp + DAILY_TRANSFER_INTERVAL_ONE_DAY;
address private _newProposedOwner;
uint256 private _newOwnerConfirmationTimestamp = block.timestamp;
enum ErrorType {UnexpectedRequest, NoBalanceRequest, MigrateBridge}
event BridgeTransfer(
address indexed token,
address indexed from,
address indexed to,
uint256 amount,
uint256 date,
uint256 nonce
);
event BridgeTokensUnlocked(
address indexed token,
address indexed from,
address indexed to,
uint256 amount,
uint256 date
);
event FeesReleasedToOwner(
uint256 amount,
uint256 date
);
struct TokenConfig{
uint256 maximumTransferAmount;
uint256 collectedFees;
uint256 unlockTokenPercentageFee;
uint256 dailyLockTotal;
uint256 dailyWithdrawTotal;
uint256 dailyTransferLimit;
bool exists;
}
event UnexpectedRequest(
address indexed from,
address indexed to,
uint256 amount,
uint256 date,
ErrorType indexed error
);
/** @dev Creates a cross-blockchain bridge.
* @param soku -- BEP20 token to bridge.
* @param suteku -- BEP20 token to bridge.
* @param unlockerBot -- address of account that mints/burns.
* @param pauserBot -- address of account that pauses bridge in emergencies.
*/
constructor(address soku, address suteku, address payable unlockerBot, address pauserBot) {
require(soku!=address(0) && suteku!=address(0) && unlockerBot != address(0) && pauserBot!= address(0) );
_unlocker_bot = unlockerBot;
_pauser_bot = pauserBot;
_sokuToken = IERC20(soku);
_sutekuToken = IERC20(suteku);
configTokens();
}
function configTokens() internal{
_tokenConfig[_sokuToken] = TokenConfig({
maximumTransferAmount :10000000000000000000000000,
collectedFees:0,
unlockTokenPercentageFee:0,
dailyLockTotal:0,
dailyWithdrawTotal:0,
dailyTransferLimit:1000000000000000000000000000,
exists:true
});
_tokenConfig[_sutekuToken] = TokenConfig({
maximumTransferAmount:10000000000000000000000000,
collectedFees:0,
unlockTokenPercentageFee:0,
dailyLockTotal:0,
dailyWithdrawTotal:0,
dailyTransferLimit:1000000000000000000000000000,
exists:true
});
}
modifier Pausable() {
require( !paused, "Bridge: Paused.");
_;
}
modifier OnlyUnlocker() {
require(msg.sender == _unlocker_bot, "Bridge: You can't call this function.");
_;
}
modifier OnlyPauserAndOwner() {
require((msg.sender == _pauser_bot || msg.sender == owner()), "Bridge: You can't call this function.");
_;
}
modifier onlySokuTokens(IERC20 token) {
require(
address(token) == address(_sutekuToken) ||
address(token) == address(_sokuToken), "Bridge: Token not authorized.");
_;
}
function resetTransferCounter(IERC20 token) internal {
_dailyTransferNextTimestamp = block.timestamp + DAILY_TRANSFER_INTERVAL_ONE_DAY;
TokenConfig storage config = _tokenConfig[token];
config.dailyLockTotal = 0;
config.dailyWithdrawTotal = 0;
}
/** @dev Locks tokens to bridge. External bot initiates unlock on other blockchain.
* @param amount -- Amount of BabyDoge to lock.
*/
function lock(IERC20 token, uint256 amount) external onlySokuTokens(token) Pausable {
address sender = msg.sender;
require(_tokenConfig[token].exists == true, "Bridge: access denied.");
require(token.balanceOf(sender) >= amount, "Bridge: Account has insufficient balance.");
TokenConfig storage config = _tokenConfig[token];
require(amount <= config.maximumTransferAmount, "Bridge: Please reduce the amount of tokens.");
if (block.timestamp >= _dailyTransferNextTimestamp) {
resetTransferCounter(token);
}
config.dailyLockTotal = config.dailyLockTotal + amount;
if(config.dailyLockTotal > config.dailyTransferLimit) {
revert("Bridge: Daily transfer limit reached.");
}
require(token.transferFrom(sender, address(this), amount), "Bridge: Transfer failed.");
emit BridgeTransfer(
address(token),
sender,
address(this),
amount,
block.timestamp,
nonce
);
nonce++;
}
// Verificar limite transacao
function release(IERC20 token, address to, uint256 amount, uint256 otherChainNonce)
external OnlyUnlocker() onlySokuTokens(token) Pausable {
require(!_processedNonces[otherChainNonce], "Bridge: Transaction processed.");
require(to!= address(0), "Bridge: access denied.");
TokenConfig storage config = _tokenConfig[token];
require(amount <= config.maximumTransferAmount, "Bridge: Transfer blocked.");
_processedNonces[otherChainNonce] = true;
_balances[token][to] = _balances[token][to] + amount;
}
function getPrice() public view returns(uint256){
AggregatorV3Interface priceFeed = AggregatorV3Interface(0x5f4eC3Df9cbd43714FE2740f5E3616155c5b8419);
(,int256 answer,,,) = priceFeed.latestRoundData();
return uint256(answer * 10000000000);
}
function getConversionRate(uint256 ethAmount) public view returns (uint256 ethAmountInUsd){ //wei unit
uint256 ethPrice = getPrice();
return (ethPrice*ethAmount) / 1000000000000000000; // otherwise 18 + 18 = 36 decimal - need to remove 18 decimal
}
function getFee() view public returns (uint256 result) {
uint256 ethPrice = getPrice();
return (((minimumUSD*100000000000000000000) / ethPrice))/100;
}
function withdraw(IERC20 token) external onlySokuTokens(token) payable Pausable {
require(getConversionRate(msg.value) >= getFee(), "You need to spend more ETH"); // otherwise reverts
address claimer = msg.sender;
uint256 claimerBalance = _balances[token][claimer];
require(claimerBalance > 0, "Bridge: No balance.");
TokenConfig storage config = _tokenConfig[token];
if (block.timestamp >= _dailyTransferNextTimestamp) {
resetTransferCounter(token);
}
config.dailyWithdrawTotal = config.dailyWithdrawTotal + claimerBalance;
if(config.dailyWithdrawTotal > config.dailyTransferLimit) {
revert("Bridge: Daily transfer limit reached.");
}
if(claimerBalance > token.balanceOf(address(this))) {
revert('Bridge: No funds in the bridge.');
}
if (claimerBalance >= config.dailyTransferLimit) {
pauseBridge(msg.sender, address(this), claimerBalance);
revert('Bridge: Paused.');
}
if (address(this).balance >= feeReleaseThreshold) {
uint256 amountReleased = address(this).balance;
(bool success, ) = _unlocker_bot.call{value : amountReleased}("Releasing fee to unlocker");
require(success, "Transfer failed.");
emit FeesReleasedToOwner(amountReleased, block.timestamp);
}
_balances[token][claimer] = _balances[token][claimer] - claimerBalance;
if (config.unlockTokenPercentageFee > 0) {
uint256 amountFee = (claimerBalance * config.unlockTokenPercentageFee) / 100;
claimerBalance = claimerBalance - amountFee;
config.collectedFees = config.collectedFees + amountFee;
}
require(token.transfer(claimer, claimerBalance), "Bridge: Transfer failed");
emit BridgeTokensUnlocked(address(token), address(this), msg.sender, claimerBalance, block.timestamp);
}
function getBalance(IERC20 token) public view onlySokuTokens(token) returns (uint256 balance) {
return _balances[token][msg.sender];
}
function getTokenConfig(IERC20 token) public view onlySokuTokens(token) returns (TokenConfig memory) {
return _tokenConfig[token];
}
function setTokenConfig(
IERC20 token,
uint256 maximumTransferAmount,
uint256 unlockTokenPercentageFee,
uint256 dailyTransferLimit) external onlySokuTokens(token) onlyOwner() {
TokenConfig storage config = _tokenConfig[token];
config.maximumTransferAmount = maximumTransferAmount;
config.unlockTokenPercentageFee = unlockTokenPercentageFee;
config.dailyTransferLimit = dailyTransferLimit;
}
function resetDailyTotals(IERC20 token) external onlySokuTokens(token) onlyOwner() {
resetTransferCounter(token);
}
function setMinimumUsdFee(uint256 usd) external onlyOwner() {
require(usd > 0, "Can't be zero");
minimumUSD = usd * 10 ** 18;
}
function setTokenPercentageFee(IERC20 token, uint256 tokenFee) external onlyOwner() onlySokuTokens(token) {
require(tokenFee < 25, "Bridge: Gotta be smaller then 25") ;
TokenConfig storage config = _tokenConfig[token];
require(config.exists, "Bridge: Token not found");
config.unlockTokenPercentageFee = tokenFee;
}
function setFeeReleaseThreshold(uint256 amount) external onlyOwner() {
require(amount > 0, "Bridge: Can't be zero");
feeReleaseThreshold = amount;
}
function withdrawEth() external onlyOwner() {
uint256 amountReleased = address(this).balance;
(bool success, ) = owner().call{value : amountReleased}("Releasing eth to owner");
require(success, "Transfer failed");
}
function withdrawERC20(IERC20 token) external onlyOwner() nonReentrant {
require(address(token) != address(0), "Bridge: Can't be zero");
require(token.balanceOf(address(this)) >= 0, "Bridge: Account has insufficient balance.");
require(token.transfer(owner(), token.balanceOf(address(this))), "Bridge: Transfer failed.");
}
function withdrawCollectedFees(IERC20 token) external onlyOwner() onlySokuTokens(token) nonReentrant {
TokenConfig storage config = _tokenConfig[token];
require(config.exists, "Bridge: Token not found");
require(token.balanceOf(address(this)) >= config.collectedFees, "Bridge: Account has insufficient balance.");
require(token.transfer(owner(), config.collectedFees), "Bridge: Transfer failed.");
config.collectedFees = 0;
}
function setUnlocker(address _unlocker) external onlyOwner {
require(_unlocker != _unlocker_bot, "This address is already set as unlocker.");
_unlocker_bot = payable(_unlocker);
}
function setPauser(address _pauser) external onlyOwner {
require(_pauser != _pauser_bot, "This address is already set as pauser.");
_pauser_bot = _pauser;
}
function setPausedState(bool state) external onlyOwner() {
paused = state;
}
function pauseBridge(address from, address to, uint256 amount) internal {
paused = true;
emit UnexpectedRequest(
from,
to,
amount,
block.timestamp,
ErrorType.UnexpectedRequest
);
}
}