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- Contract name:
- Bridge
- Optimization enabled
- false
- Compiler version
- v0.8.6+commit.11564f7e
- Verified at
- 2022-10-04T17:22:28.650889Z
Constructor Arguments
000000000000000000000000c2eb9e06602d5e043905127a8f4f2e3a6bc057e7
Arg [0] (address) : 0xc2eb9e06602d5e043905127a8f4f2e3a6bc057e7
contracts/Bridge.sol
// SPDX-License-Identifier: Unlicensed
pragma solidity ^0.8.6;
// OpenZeppelin
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/math/SafeMath.sol";
interface IBridgeMigrationSource {
function tokenAddress() external view returns (address);
function settlingAgent() external view returns (address payable);
}
contract Bridge is Ownable {
using SafeMath for uint256;
struct BridgeRequest {
address account;
uint256 amount;
uint256 blockNumber;
uint256 timestamp;
}
event RequestSent (uint256 indexed _id, address indexed _account, uint256 _amount, uint256 _blocknumber);
event RequestReceived (uint256 indexed _id, address indexed _account, uint256 _amount, uint256 _amountPaid, uint256 _blocknumber);
event RequiredConfirmationsChanged (uint256 _value);
event PayoutRatioChanged (uint256 _nominator, uint256 _denominator);
constructor(address _tokenAddress) {
settlingAgent = payable(msg.sender);
tokenAddress = _tokenAddress;
}
address payable public settlingAgent;
function setSettlingAgent(address _address) public onlyOwner {
settlingAgent = payable(_address);
}
address public tokenAddress;
function setTokenAddress(address _address) public onlyOwner {
tokenAddress = _address;
}
uint256 public payoutRatioNominator = 1;
uint256 public payoutRatioDenominator = 1;
function setPayoutRatio(uint256 _nominator, uint256 _denominator) public onlyOwner {
require(_nominator > 0, "Nominator must be greater than zero");
require(_denominator > 0, "Denominator must be greater than zero");
payoutRatioNominator = _nominator;
payoutRatioDenominator = _denominator;
emit PayoutRatioChanged(_nominator, _denominator);
}
uint256 public outgoingTransferFee = 0.1 * 10**18;
function setOutgoingTransferFee(uint256 _amount) public onlyOwner {
outgoingTransferFee = _amount;
}
uint256 public maximumTransferAmount = 0;
function setMaximumTransferAmount(uint256 _amount) public onlyOwner {
maximumTransferAmount = _amount;
}
uint256 public requiredConfirmations = 20;
function setRequiredConfirmations(uint256 _amount) public onlyOwner {
requiredConfirmations = _amount;
emit RequiredConfirmationsChanged(_amount);
}
modifier onlyAgent() {
require(msg.sender == settlingAgent, "This action can only be executed by the settling agent");
_;
}
uint256 public sentRequestCount;
mapping (uint256 => BridgeRequest) public sentRequests;
uint256 public receivedRequestCount;
mapping (uint256 => bool) public receivedRequests;
function withdrawETH() public onlyOwner {
payable(owner()).transfer(address(this).balance);
}
function withdrawToken(address _tokenAddress) public onlyOwner {
IERC20 token = IERC20(_tokenAddress);
require(token.transfer(owner(), token.balanceOf(address(this))), "Failed to transfer tokens");
}
function bridgeToken(uint256 _amount) public payable {
require(msg.value >= outgoingTransferFee, "Underpaid transaction: please provide the outgoing transfer fee." );
require(_amount <= maximumTransferAmount || maximumTransferAmount == 0, "Requested amount exceeds maximum amount to transfer.");
IERC20 erc20 = IERC20(tokenAddress);
uint256 balanceBefore = erc20.balanceOf(address(this));
require(erc20.transferFrom (msg.sender, address(this) , _amount), "Transferring tokens was cancelled by the token contract. Please check with the token developer.");
uint256 balanceExpected = balanceBefore + _amount;
require(erc20.balanceOf(address(this)) >= balanceExpected, "Did not receive enough tokens from sender. Is the bridge exempted from taxes?");
sentRequestCount++;
settlingAgent.transfer(msg.value);
sentRequests[sentRequestCount].account = msg.sender;
sentRequests[sentRequestCount].amount = _amount;
sentRequests[sentRequestCount].blockNumber = block.number;
sentRequests[sentRequestCount].timestamp = block.timestamp;
emit RequestSent(sentRequestCount, msg.sender, _amount, block.number);
}
function settleRequest(uint256 _id, address _account, uint256 _amount) public onlyAgent {
IERC20 erc20 = IERC20(tokenAddress);
uint256 _amountRespectingPayoutRatio = _amount.mul(payoutRatioNominator).div(payoutRatioDenominator);
require (!receivedRequests[_id], "This request was already settled");
require (erc20.balanceOf(address(this)) >= _amountRespectingPayoutRatio, "Token deposit insufficient for settlement");
receivedRequestCount++;
receivedRequests[receivedRequestCount] = true;
require(erc20.transfer(_account, _amountRespectingPayoutRatio), "Failed to send tokens to the receiving account.");
emit RequestReceived(receivedRequestCount, _account, _amount, _amountRespectingPayoutRatio, block.number);
}
receive() external payable {}
fallback() external payable {}
function migrateFrom(address _oldAddress) public onlyOwner {
IBridgeMigrationSource oldBridge = IBridgeMigrationSource(_oldAddress);
tokenAddress = oldBridge.tokenAddress();
settlingAgent = oldBridge.settlingAgent();
payoutRatioNominator = tryGetValue(_oldAddress, "payoutRatioNominator()", payoutRatioNominator);
payoutRatioDenominator = tryGetValue(_oldAddress, "payoutRatioDenominator()", payoutRatioDenominator);
outgoingTransferFee = tryGetValue(_oldAddress, "outgoingTransferFee()", outgoingTransferFee);
maximumTransferAmount = tryGetValue(_oldAddress, "maximumTransferAmount()", maximumTransferAmount);
requiredConfirmations = tryGetValue(_oldAddress, "requiredConfirmations()", requiredConfirmations);
}
function tryGetValue(address _address, string memory _signature, uint256 _fallback) private view returns (uint256) {
(bool result, bytes memory retval) = _address.staticcall(abi.encodeWithSignature(_signature));
if (result) {
return abi.decode(retval, (uint256));
}
else {
return _fallback;
}
}
}
@openzeppelin/contracts/access/Ownable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)
pragma solidity ^0.8.0;
import "../utils/Context.sol";
/**
* @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);
}
}
@openzeppelin/contracts/token/ERC20/IERC20.sol
// 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);
}
@openzeppelin/contracts/utils/Context.sol
// SPDX-License-Identifier: MIT
// 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;
}
}
@openzeppelin/contracts/utils/math/SafeMath.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/math/SafeMath.sol)
pragma solidity ^0.8.0;
// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.
/**
* @dev Wrappers over Solidity's arithmetic operations.
*
* NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
* now has built in overflow checking.
*/
library SafeMath {
/**
* @dev Returns the addition of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
uint256 c = a + b;
if (c < a) return (false, 0);
return (true, c);
}
}
/**
* @dev Returns the substraction of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b > a) return (false, 0);
return (true, a - b);
}
}
/**
* @dev Returns the multiplication of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
if (a == 0) return (true, 0);
uint256 c = a * b;
if (c / a != b) return (false, 0);
return (true, c);
}
}
/**
* @dev Returns the division of two unsigned integers, with a division by zero flag.
*
* _Available since v3.4._
*/
function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b == 0) return (false, 0);
return (true, a / b);
}
}
/**
* @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
*
* _Available since v3.4._
*/
function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b == 0) return (false, 0);
return (true, a % b);
}
}
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
*
* - Addition cannot overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
return a + b;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return a - b;
}
/**
* @dev Returns the multiplication of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `*` operator.
*
* Requirements:
*
* - Multiplication cannot overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
return a * b;
}
/**
* @dev Returns the integer division of two unsigned integers, reverting on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator.
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return a / b;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* reverting when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
return a % b;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {trySub}.
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
unchecked {
require(b <= a, errorMessage);
return a - b;
}
}
/**
* @dev Returns the integer division of two unsigned integers, reverting with custom message on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
unchecked {
require(b > 0, errorMessage);
return a / b;
}
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* reverting with custom message when dividing by zero.
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {tryMod}.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
unchecked {
require(b > 0, errorMessage);
return a % b;
}
}
}
Contract ABI
[{"type":"constructor","stateMutability":"nonpayable","inputs":[{"type":"address","name":"_tokenAddress","internalType":"address"}]},{"type":"event","name":"OwnershipTransferred","inputs":[{"type":"address","name":"previousOwner","internalType":"address","indexed":true},{"type":"address","name":"newOwner","internalType":"address","indexed":true}],"anonymous":false},{"type":"event","name":"PayoutRatioChanged","inputs":[{"type":"uint256","name":"_nominator","internalType":"uint256","indexed":false},{"type":"uint256","name":"_denominator","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"RequestReceived","inputs":[{"type":"uint256","name":"_id","internalType":"uint256","indexed":true},{"type":"address","name":"_account","internalType":"address","indexed":true},{"type":"uint256","name":"_amount","internalType":"uint256","indexed":false},{"type":"uint256","name":"_amountPaid","internalType":"uint256","indexed":false},{"type":"uint256","name":"_blocknumber","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"RequestSent","inputs":[{"type":"uint256","name":"_id","internalType":"uint256","indexed":true},{"type":"address","name":"_account","internalType":"address","indexed":true},{"type":"uint256","name":"_amount","internalType":"uint256","indexed":false},{"type":"uint256","name":"_blocknumber","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"RequiredConfirmationsChanged","inputs":[{"type":"uint256","name":"_value","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"fallback","stateMutability":"payable"},{"type":"function","stateMutability":"payable","outputs":[],"name":"bridgeToken","inputs":[{"type":"uint256","name":"_amount","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"maximumTransferAmount","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"migrateFrom","inputs":[{"type":"address","name":"_oldAddress","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"outgoingTransferFee","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"owner","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"payoutRatioDenominator","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"payoutRatioNominator","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"receivedRequestCount","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"receivedRequests","inputs":[{"type":"uint256","name":"","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"renounceOwnership","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"requiredConfirmations","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"sentRequestCount","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"account","internalType":"address"},{"type":"uint256","name":"amount","internalType":"uint256"},{"type":"uint256","name":"blockNumber","internalType":"uint256"},{"type":"uint256","name":"timestamp","internalType":"uint256"}],"name":"sentRequests","inputs":[{"type":"uint256","name":"","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setMaximumTransferAmount","inputs":[{"type":"uint256","name":"_amount","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setOutgoingTransferFee","inputs":[{"type":"uint256","name":"_amount","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setPayoutRatio","inputs":[{"type":"uint256","name":"_nominator","internalType":"uint256"},{"type":"uint256","name":"_denominator","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setRequiredConfirmations","inputs":[{"type":"uint256","name":"_amount","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setSettlingAgent","inputs":[{"type":"address","name":"_address","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setTokenAddress","inputs":[{"type":"address","name":"_address","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"settleRequest","inputs":[{"type":"uint256","name":"_id","internalType":"uint256"},{"type":"address","name":"_account","internalType":"address"},{"type":"uint256","name":"_amount","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address payable"}],"name":"settlingAgent","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"tokenAddress","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"transferOwnership","inputs":[{"type":"address","name":"newOwner","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"withdrawETH","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"withdrawToken","inputs":[{"type":"address","name":"_tokenAddress","internalType":"address"}]},{"type":"receive","stateMutability":"payable"}]
Deployed ByteCode
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