Overview
ETH Balance
0 ETH
Eth Value
$0.00Token Holdings
Latest 25 from a total of 11,219 transactions
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New Relay Eon | 21472578 | 13 mins ago | IN | 0 ETH | 0.00021006 | ||||
Swap | 21468648 | 13 hrs ago | IN | 0 ETH | 0.00071332 | ||||
Reverse Swap | 21468615 | 13 hrs ago | IN | 0 ETH | 0.00066094 | ||||
Reverse Swap | 21463059 | 32 hrs ago | IN | 0 ETH | 0.0002977 | ||||
Reverse Swap | 21462984 | 32 hrs ago | IN | 0 ETH | 0.00030851 | ||||
Swap | 21462938 | 32 hrs ago | IN | 0 ETH | 0.00035011 | ||||
Swap | 21461493 | 37 hrs ago | IN | 0 ETH | 0.0003088 | ||||
Swap | 21461168 | 38 hrs ago | IN | 0 ETH | 0.00036798 | ||||
Swap | 21461106 | 38 hrs ago | IN | 0 ETH | 0.00041171 | ||||
Reverse Swap | 21460069 | 42 hrs ago | IN | 0 ETH | 0.00047167 | ||||
New Relay Eon | 21459690 | 43 hrs ago | IN | 0 ETH | 0.00020302 | ||||
Swap | 21459484 | 44 hrs ago | IN | 0 ETH | 0.00037943 | ||||
Swap | 21459117 | 45 hrs ago | IN | 0 ETH | 0.00051687 | ||||
New Relay Eon | 21458739 | 46 hrs ago | IN | 0 ETH | 0.00026409 | ||||
Reverse Swap | 21457115 | 2 days ago | IN | 0 ETH | 0.00041025 | ||||
Reverse Swap | 21455520 | 2 days ago | IN | 0 ETH | 0.00043275 | ||||
New Relay Eon | 21453878 | 2 days ago | IN | 0 ETH | 0.00020043 | ||||
Swap | 21453397 | 2 days ago | IN | 0 ETH | 0.00046438 | ||||
Swap | 21452322 | 2 days ago | IN | 0 ETH | 0.00059519 | ||||
Swap | 21450468 | 3 days ago | IN | 0 ETH | 0.00051251 | ||||
Swap | 21450340 | 3 days ago | IN | 0 ETH | 0.0005338 | ||||
New Relay Eon | 21448727 | 3 days ago | IN | 0 ETH | 0.00021427 | ||||
Reverse Swap | 21445651 | 3 days ago | IN | 0 ETH | 0.00132343 | ||||
Swap | 21444429 | 3 days ago | IN | 0 ETH | 0.00208286 | ||||
Swap | 21444253 | 3 days ago | IN | 0 ETH | 0.00196997 |
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Contract Name:
Bridge
Compiler Version
v0.7.6+commit.7338295f
Contract Source Code (Solidity)
/** *Submitted for verification at Etherscan.io on 2021-03-28 */ // SPDX-License-Identifier: Apache-2.0 pragma solidity 0.7.6; // Part: Address /** * @dev Collection of functions related to the address type */ library Address { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize, which returns 0 for contracts in // construction, since the code is only stored at the end of the // constructor execution. uint256 size; // solhint-disable-next-line no-inline-assembly assembly { size := extcodesize(account) } return size > 0; } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); // solhint-disable-next-line avoid-low-level-calls, avoid-call-value (bool success, ) = recipient.call{ value: amount }(""); require(success, "Address: unable to send value, recipient may have reverted"); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain`call` is an unsafe replacement for a function call: use this * function instead. * * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * * Requirements: * * - `target` must be a contract. * - calling `target` with `data` must not revert. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data) internal returns (bytes memory) { return functionCall(target, data, "Address: low-level call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with * `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but also transferring `value` wei to `target`. * * Requirements: * * - the calling contract must have an ETH balance of at least `value`. * - the called Solidity function must be `payable`. * * _Available since v3.1._ */ function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) { return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); } /** * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but * with `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) { require(address(this).balance >= value, "Address: insufficient balance for call"); require(isContract(target), "Address: call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.call{ value: value }(data); return _verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) { return functionStaticCall(target, data, "Address: low-level static call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) { require(isContract(target), "Address: static call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.staticcall(data); return _verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) { return functionDelegateCall(target, data, "Address: low-level delegate call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) { require(isContract(target), "Address: delegate call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.delegatecall(data); return _verifyCallResult(success, returndata, errorMessage); } function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) { if (success) { return returndata; } else { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly // solhint-disable-next-line no-inline-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } } // Part: Context /* * @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 GSN 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 payable) { return msg.sender; } function _msgData() internal view virtual returns (bytes memory) { this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 return msg.data; } } // Part: EnumerableSet /** * @dev Library for managing * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive * types. * * Sets have the following properties: * * - Elements are added, removed, and checked for existence in constant time * (O(1)). * - Elements are enumerated in O(n). No guarantees are made on the ordering. * * ``` * contract Example { * // Add the library methods * using EnumerableSet for EnumerableSet.AddressSet; * * // Declare a set state variable * EnumerableSet.AddressSet private mySet; * } * ``` * * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`) * and `uint256` (`UintSet`) are supported. */ library EnumerableSet { // To implement this library for multiple types with as little code // repetition as possible, we write it in terms of a generic Set type with // bytes32 values. // The Set implementation uses private functions, and user-facing // implementations (such as AddressSet) are just wrappers around the // underlying Set. // This means that we can only create new EnumerableSets for types that fit // in bytes32. struct Set { // Storage of set values bytes32[] _values; // Position of the value in the `values` array, plus 1 because index 0 // means a value is not in the set. mapping (bytes32 => uint256) _indexes; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function _add(Set storage set, bytes32 value) private returns (bool) { if (!_contains(set, value)) { set._values.push(value); // The value is stored at length-1, but we add 1 to all indexes // and use 0 as a sentinel value set._indexes[value] = set._values.length; return true; } else { return false; } } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function _remove(Set storage set, bytes32 value) private returns (bool) { // We read and store the value's index to prevent multiple reads from the same storage slot uint256 valueIndex = set._indexes[value]; if (valueIndex != 0) { // Equivalent to contains(set, value) // To delete an element from the _values array in O(1), we swap the element to delete with the last one in // the array, and then remove the last element (sometimes called as 'swap and pop'). // This modifies the order of the array, as noted in {at}. uint256 toDeleteIndex = valueIndex - 1; uint256 lastIndex = set._values.length - 1; // When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement. bytes32 lastvalue = set._values[lastIndex]; // Move the last value to the index where the value to delete is set._values[toDeleteIndex] = lastvalue; // Update the index for the moved value set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based // Delete the slot where the moved value was stored set._values.pop(); // Delete the index for the deleted slot delete set._indexes[value]; return true; } else { return false; } } /** * @dev Returns true if the value is in the set. O(1). */ function _contains(Set storage set, bytes32 value) private view returns (bool) { return set._indexes[value] != 0; } /** * @dev Returns the number of values on the set. O(1). */ function _length(Set storage set) private view returns (uint256) { return set._values.length; } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function _at(Set storage set, uint256 index) private view returns (bytes32) { require(set._values.length > index, "EnumerableSet: index out of bounds"); return set._values[index]; } // Bytes32Set struct Bytes32Set { Set _inner; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function add(Bytes32Set storage set, bytes32 value) internal returns (bool) { return _add(set._inner, value); } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) { return _remove(set._inner, value); } /** * @dev Returns true if the value is in the set. O(1). */ function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) { return _contains(set._inner, value); } /** * @dev Returns the number of values in the set. O(1). */ function length(Bytes32Set storage set) internal view returns (uint256) { return _length(set._inner); } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) { return _at(set._inner, index); } // AddressSet struct AddressSet { Set _inner; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function add(AddressSet storage set, address value) internal returns (bool) { return _add(set._inner, bytes32(uint256(uint160(value)))); } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function remove(AddressSet storage set, address value) internal returns (bool) { return _remove(set._inner, bytes32(uint256(uint160(value)))); } /** * @dev Returns true if the value is in the set. O(1). */ function contains(AddressSet storage set, address value) internal view returns (bool) { return _contains(set._inner, bytes32(uint256(uint160(value)))); } /** * @dev Returns the number of values in the set. O(1). */ function length(AddressSet storage set) internal view returns (uint256) { return _length(set._inner); } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function at(AddressSet storage set, uint256 index) internal view returns (address) { return address(uint160(uint256(_at(set._inner, index)))); } // UintSet struct UintSet { Set _inner; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function add(UintSet storage set, uint256 value) internal returns (bool) { return _add(set._inner, bytes32(value)); } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function remove(UintSet storage set, uint256 value) internal returns (bool) { return _remove(set._inner, bytes32(value)); } /** * @dev Returns true if the value is in the set. O(1). */ function contains(UintSet storage set, uint256 value) internal view returns (bool) { return _contains(set._inner, bytes32(value)); } /** * @dev Returns the number of values on the set. O(1). */ function length(UintSet storage set) internal view returns (uint256) { return _length(set._inner); } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function at(UintSet storage set, uint256 index) internal view returns (uint256) { return uint256(_at(set._inner, index)); } } // Part: IBridgeCommon /** * @title Events for Bi-directional bridge transferring FET tokens between Ethereum and Fetch Mainnet-v2 */ interface IBridgeCommon { event Swap(uint64 indexed id, address indexed from, string indexed indexedTo, string to, uint256 amount); event SwapRefund(uint64 indexed id, address indexed to, uint256 refundedAmount, uint256 fee); event ReverseSwap(uint64 indexed rid, address indexed to, string indexed from, bytes32 originTxHash, uint256 effectiveAmount, uint256 fee); event PausePublicApi(uint256 sinceBlock); event PauseRelayerApi(uint256 sinceBlock); event NewRelayEon(uint64 eon); event LimitsUpdate(uint256 max, uint256 min, uint256 fee); event CapUpdate(uint256 value); event ReverseAggregatedAllowanceUpdate(uint256 value); event ReverseAggregatedAllowanceApproverCapUpdate(uint256 value); event Withdraw(address indexed targetAddress, uint256 amount); event Deposit(address indexed fromAddress, uint256 amount); event FeesWithdrawal(address indexed targetAddress, uint256 amount); event DeleteContract(address targetAddress, uint256 amount); // NOTE(pb): It is NOT necessary to have dedicated events here for Mint & Burn operations, since ERC20 contract // already emits the `Transfer(from, to, amount)` events, with `from`, resp. `to`, address parameter value set to // ZERO_ADDRESS (= address(0) = 0x00...00) for `mint`, resp `burn`, calls to ERC20 contract. That way we can // identify events for mint, resp. burn, calls by filtering ERC20 Transfer events with `from == ZERO_ADDR && // to == Bridge.address` for MINT operation, resp `from == Bridge.address` and `to == ZERO_ADDR` for BURN operation. //event Mint(uint256 amount); //event Burn(uint256 amount); function getApproverRole() external view returns(bytes32); function getMonitorRole() external view returns(bytes32); function getRelayerRole() external view returns(bytes32); function getToken() external view returns(address); function getEarliestDelete() external view returns(uint256); function getSupply() external view returns(uint256); function getNextSwapId() external view returns(uint64); function getRelayEon() external view returns(uint64); function getRefund(uint64 swap_id) external view returns(uint256); // swapId -> original swap amount(= *includes* swapFee) function getSwapMax() external view returns(uint256); function getSwapMin() external view returns(uint256); function getCap() external view returns(uint256); function getSwapFee() external view returns(uint256); function getPausedSinceBlockPublicApi() external view returns(uint256); function getPausedSinceBlockRelayerApi() external view returns(uint256); function getReverseAggregatedAllowance() external view returns(uint256); function getReverseAggregatedAllowanceApproverCap() external view returns(uint256); } // Part: IERC20 /** * @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 `recipient`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address recipient, 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 `sender` to `recipient` 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 sender, address recipient, 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); } // Part: IERC20MintFacility interface IERC20MintFacility { function mint(address to, uint256 amount) external; function burn(uint256 amount) external; function burnFrom(address from, uint256 amount) external; } // Part: SafeMath /** * @dev Wrappers over Solidity's arithmetic operations with added overflow * checks. * * Arithmetic operations in Solidity wrap on overflow. This can easily result * in bugs, because programmers usually assume that an overflow raises an * error, which is the standard behavior in high level programming languages. * `SafeMath` restores this intuition by reverting the transaction when an * operation overflows. * * Using this library instead of the unchecked operations eliminates an entire * class of bugs, so it's recommended to use it always. */ 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) { 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) { 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) { // 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) { 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) { 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) { uint256 c = a + b; require(c >= a, "SafeMath: addition overflow"); return c; } /** * @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) { require(b <= a, "SafeMath: subtraction overflow"); 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) { if (a == 0) return 0; uint256 c = a * b; require(c / a == b, "SafeMath: multiplication overflow"); return c; } /** * @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. 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) internal pure returns (uint256) { require(b > 0, "SafeMath: division by zero"); 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) { require(b > 0, "SafeMath: modulo by zero"); 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) { 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. * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {tryDiv}. * * 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) { 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) { require(b > 0, errorMessage); return a % b; } } // Part: AccessControl /** * @dev Contract module that allows children to implement role-based access * control mechanisms. * * Roles are referred to by their `bytes32` identifier. These should be exposed * in the external API and be unique. The best way to achieve this is by * using `public constant` hash digests: * * ``` * bytes32 public constant MY_ROLE = keccak256("MY_ROLE"); * ``` * * Roles can be used to represent a set of permissions. To restrict access to a * function call, use {hasRole}: * * ``` * function foo() public { * require(hasRole(MY_ROLE, msg.sender)); * ... * } * ``` * * Roles can be granted and revoked dynamically via the {grantRole} and * {revokeRole} functions. Each role has an associated admin role, and only * accounts that have a role's admin role can call {grantRole} and {revokeRole}. * * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means * that only accounts with this role will be able to grant or revoke other * roles. More complex role relationships can be created by using * {_setRoleAdmin}. * * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to * grant and revoke this role. Extra precautions should be taken to secure * accounts that have been granted it. */ abstract contract AccessControl is Context { using EnumerableSet for EnumerableSet.AddressSet; using Address for address; struct RoleData { EnumerableSet.AddressSet members; bytes32 adminRole; } mapping (bytes32 => RoleData) private _roles; bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00; /** * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole` * * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite * {RoleAdminChanged} not being emitted signaling this. * * _Available since v3.1._ */ event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole); /** * @dev Emitted when `account` is granted `role`. * * `sender` is the account that originated the contract call, an admin role * bearer except when using {_setupRole}. */ event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender); /** * @dev Emitted when `account` is revoked `role`. * * `sender` is the account that originated the contract call: * - if using `revokeRole`, it is the admin role bearer * - if using `renounceRole`, it is the role bearer (i.e. `account`) */ event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender); /** * @dev Returns `true` if `account` has been granted `role`. */ function hasRole(bytes32 role, address account) public view returns (bool) { return _roles[role].members.contains(account); } /** * @dev Returns the number of accounts that have `role`. Can be used * together with {getRoleMember} to enumerate all bearers of a role. */ function getRoleMemberCount(bytes32 role) public view returns (uint256) { return _roles[role].members.length(); } /** * @dev Returns one of the accounts that have `role`. `index` must be a * value between 0 and {getRoleMemberCount}, non-inclusive. * * Role bearers are not sorted in any particular way, and their ordering may * change at any point. * * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure * you perform all queries on the same block. See the following * https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post] * for more information. */ function getRoleMember(bytes32 role, uint256 index) public view returns (address) { return _roles[role].members.at(index); } /** * @dev Returns the admin role that controls `role`. See {grantRole} and * {revokeRole}. * * To change a role's admin, use {_setRoleAdmin}. */ function getRoleAdmin(bytes32 role) public view returns (bytes32) { return _roles[role].adminRole; } /** * @dev Grants `role` to `account`. * * If `account` had not been already granted `role`, emits a {RoleGranted} * event. * * Requirements: * * - the caller must have ``role``'s admin role. */ function grantRole(bytes32 role, address account) public virtual { require(hasRole(_roles[role].adminRole, _msgSender()), "AccessControl: sender must be an admin to grant"); _grantRole(role, account); } /** * @dev Revokes `role` from `account`. * * If `account` had been granted `role`, emits a {RoleRevoked} event. * * Requirements: * * - the caller must have ``role``'s admin role. */ function revokeRole(bytes32 role, address account) public virtual { require(hasRole(_roles[role].adminRole, _msgSender()), "AccessControl: sender must be an admin to revoke"); _revokeRole(role, account); } /** * @dev Revokes `role` from the calling account. * * Roles are often managed via {grantRole} and {revokeRole}: this function's * purpose is to provide a mechanism for accounts to lose their privileges * if they are compromised (such as when a trusted device is misplaced). * * If the calling account had been granted `role`, emits a {RoleRevoked} * event. * * Requirements: * * - the caller must be `account`. */ function renounceRole(bytes32 role, address account) public virtual { require(account == _msgSender(), "AccessControl: can only renounce roles for self"); _revokeRole(role, account); } /** * @dev Grants `role` to `account`. * * If `account` had not been already granted `role`, emits a {RoleGranted} * event. Note that unlike {grantRole}, this function doesn't perform any * checks on the calling account. * * [WARNING] * ==== * This function should only be called from the constructor when setting * up the initial roles for the system. * * Using this function in any other way is effectively circumventing the admin * system imposed by {AccessControl}. * ==== */ function _setupRole(bytes32 role, address account) internal virtual { _grantRole(role, account); } /** * @dev Sets `adminRole` as ``role``'s admin role. * * Emits a {RoleAdminChanged} event. */ function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual { emit RoleAdminChanged(role, _roles[role].adminRole, adminRole); _roles[role].adminRole = adminRole; } function _grantRole(bytes32 role, address account) private { if (_roles[role].members.add(account)) { emit RoleGranted(role, account, _msgSender()); } } function _revokeRole(bytes32 role, address account) private { if (_roles[role].members.remove(account)) { emit RoleRevoked(role, account, _msgSender()); } } } // Part: IBridgeMonitor /** * @title *Monitor* interface of Bi-directional bridge for transfer of FET tokens between Ethereum * and Fetch Mainnet-v2. * * @notice By design, all methods of this monitor-level interface can be called monitor and admin roles of * the Bridge contract. * */ interface IBridgeMonitor is IBridgeCommon { /** * @notice Pauses Public API since the specified block number * @param blockNumber block number since which non-admin interaction will be paused (for all * block.number >= blockNumber). * @dev Delegate only * If `blocknumber < block.number`, then contract will be paused immediately = from `block.number`. */ function pausePublicApiSince(uint256 blockNumber) external; /** * @notice Pauses Relayer API since the specified block number * @param blockNumber block number since which non-admin interaction will be paused (for all * block.number >= blockNumber). * @dev Delegate only * If `blocknumber < block.number`, then contract will be paused immediately = from `block.number`. */ function pauseRelayerApiSince(uint256 blockNumber) external; } // Part: IBridgePublic /** * @title Public interface of the Bridge for transferring FET tokens between Ethereum and Fetch Mainnet-v2 * * @notice Methods of this public interface is allow users to interact with Bridge contract. */ interface IBridgePublic is IBridgeCommon { /** * @notice Initiates swap, which will be relayed to the other blockchain. * Swap might fail, if `destinationAddress` value is invalid (see bellow), in which case the swap will be * refunded back to user. Swap fee will be *WITHDRAWN* from `amount` in that case - please see details * in desc. for `refund(...)` call. * * @dev Swap call will create unique identifier (swap id), which is, by design, sequentially growing by 1 per each * new swap created, and so uniquely identifies each swap. This identifier is referred to as "reverse swap id" * on the other blockchain. * Callable by anyone. * * @param destinationAddress - address on **OTHER** blockchain where the swap effective amount will be transferred * in to. * User is **RESPONSIBLE** for providing the **CORRECT** and valid value. * The **CORRECT** means, in this context, that address is valid *AND* user really * intended this particular address value as destination = that address is NOT lets say * copy-paste mistake made by user. Reason being that when user provided valid address * value, but made mistake = address is of someone else (e.g. copy-paste mistake), then * there is **NOTHING** what can be done to recover funds back to user (= refund) once * the swap will be relayed to the other blockchain! * The **VALID** means that provided value successfully passes consistency checks of * valid address of **OTHER** blockchain. In the case when user provides invalid * address value, relayer will execute refund - please see desc. for `refund()` call * for more details. */ function swap(uint256 amount, string calldata destinationAddress) external; } // Part: IBridgeRelayer /** * @title *Relayer* interface of Bi-directional bridge for transfer of FET tokens between Ethereum * and Fetch Mainnet-v2. * * @notice By design, all methods of this relayer-level interface can be called exclusively by relayer(s) of * the Bridge contract. * It is offers set of methods to perform relaying functionality of the Bridge = transferring swaps * across chains. * * @notice This bridge allows to transfer [ERC20-FET] tokens from Ethereum Mainnet to [Native FET] tokens on Fetch * Native Mainnet-v2 and **other way around** (= it is bi-directional). * User will be *charged* swap fee defined in counterpart contract deployed on Fetch Native Mainnet-v2. * In the case of a refund, user will be charged a swap fee configured in this contract. * * Swap Fees for `swap(...)` operations (direction from this contract to Native Fetch Mainnet-v2 are handled by * the counterpart contract on Fetch Native Mainnet-v2, **except** for refunds, for * which user is charged swap fee defined by this contract (since relayer needs to send refund transaction back * to this contract. */ interface IBridgeRelayer is IBridgeCommon { /** * @notice Starts the new relay eon. * @dev Relay eon concept is part of the design in order to ensure safe management of hand-over between two * relayer services. It provides clean isolation of potentially still pending transactions from previous * relayer svc and the current one. */ function newRelayEon() external; /** * @notice Refunds swap previously created by `swap(...)` call to this contract. The `swapFee` is *NOT* refunded * back to the user (this is by-design). * * @dev Callable exclusively by `relayer` role * * @param id - swap id to refund - must be swap id of swap originally created by `swap(...)` call to this contract, * **NOT** *reverse* swap id! * @param to - address where the refund will be transferred in to(IDENTICAL to address used in associated `swap` * call) * @param amount - original amount specified in associated `swap` call = it INCLUDES swap fee, which will be * withdrawn * @param relayEon_ - current relay eon, ensures safe management of relaying process */ function refund(uint64 id, address to, uint256 amount, uint64 relayEon_) external; /** * @notice Refunds swap previously created by `swap(...)` call to this contract, where `swapFee` *IS* refunded * back to the user (= swap fee is waived = user will receive full `amount`). * Purpose of this method is to enable full refund in the situations when it si not user's fault that * swap needs to be refunded (e.g. when Fetch Native Mainnet-v2 will become unavailable for prolonged * period of time, etc. ...). * * @dev Callable exclusively by `relayer` role * * @param id - swap id to refund - must be swap id of swap originally created by `swap(...)` call to this contract, * **NOT** *reverse* swap id! * @param to - address where the refund will be transferred in to(IDENTICAL to address used in associated `swap` * call) * @param amount - original amount specified in associated `swap` call = it INCLUDES swap fee, which will be * waived = user will receive whole `amount` value. * Pleas mind that `amount > 0`, otherways relayer will pay Tx fee for executing the transaction * which will have *NO* effect (= like this function `refundInFull(...)` would *not* have been * called at all! * @param relayEon_ - current relay eon, ensures safe management of relaying process */ function refundInFull(uint64 id, address to, uint256 amount, uint64 relayEon_) external; /** * @notice Finalises swap initiated by counterpart contract on the other blockchain. * This call sends swapped tokens to `to` address value user specified in original swap on the **OTHER** * blockchain. * * @dev Callable exclusively by `relayer` role * * @param rid - reverse swap id - unique identifier of the swap initiated on the **OTHER** blockchain. * This id is, by definition, sequentially growing number incremented by 1 for each new swap initiated * the other blockchain. **However**, it is *NOT* ensured that *all* swaps from the other blockchain * will be transferred to this (Ethereum) blockchain, since some of these swaps can be refunded back * to users (on the other blockchain). * @param to - address where the refund will be transferred in to * @param from - source address from which user transferred tokens from on the other blockchain. Present primarily * for purposes of quick querying of events on this blockchain. * @param originTxHash - transaction hash for swap initiated on the **OTHER** blockchain. Present in order to * create strong bond between this and other blockchain. * @param amount - original amount specified in associated swap initiated on the other blockchain. * Swap fee is *withdrawn* from the `amount` user specified in the swap on the other blockchain, * what means that user receives `amount - swapFee`, or *nothing* if `amount <= swapFee`. * Pleas mind that `amount > 0`, otherways relayer will pay Tx fee for executing the transaction * which will have *NO* effect (= like this function `refundInFull(...)` would *not* have been * called at all! * @param relayEon_ - current relay eon, ensures safe management of relaying process */ function reverseSwap( uint64 rid, address to, string calldata from, bytes32 originTxHash, uint256 amount, uint64 relayEon_ ) external; } // Part: IERC20Token interface IERC20Token is IERC20, IERC20MintFacility {} // Part: IBridgeAdmin /** * @title *Administrative* interface of Bi-directional bridge for transfer of FET tokens between Ethereum * and Fetch Mainnet-v2. * * @notice By design, all methods of this administrative interface can be called exclusively by administrator(s) of * the Bridge contract, since it allows to configure essential parameters of the the Bridge, and change * supply transferred across the Bridge. */ interface IBridgeAdmin is IBridgeCommon, IBridgeMonitor { /** * @notice Returns amount of excess FET ERC20 tokens which were sent to address of this contract via direct ERC20 * transfer (by calling ERC20.transfer(...)), without interacting with API of this contract, what can happen * only by mistake. * * @return targetAddress : address to send tokens to */ function getFeesAccrued() external view returns(uint256); /** * @notice Mints provided amount of FET tokens. * This is to reflect changes in minted Native FET token supply on the Fetch Native Mainnet-v2 blockchain. * @param amount - number of FET tokens to mint. */ function mint(uint256 amount) external; /** * @notice Burns provided amount of FET tokens. * This is to reflect changes in minted Native FET token supply on the Fetch Native Mainnet-v2 blockchain. * @param amount - number of FET tokens to burn. */ function burn(uint256 amount) external; /** * @notice Sets cap (max) value of `supply` this contract can hold = the value of tokens transferred to the other * blockchain. * This cap affects(limits) all operations which *increase* contract's `supply` value = `swap(...)` and * `mint(...)`. * @param value - new cap value. */ function setCap(uint256 value) external; /** * @notice Sets value of `reverseAggregatedAllowance` state variable. * This affects(limits) operations which *decrease* contract's `supply` value via **RELAYER** authored * operations (= `reverseSwap(...)` and `refund(...)`). It does **NOT** affect **ADMINISTRATION** authored * supply decrease operations (= `withdraw(...)` & `burn(...)`). * @param value - new cap value. */ function setReverseAggregatedAllowance(uint256 value) external; /** * @notice Sets value of `reverseAggregatedAllowanceCap` state variable. * This limits APPROVER_ROLE from top - value up to which can approver rise the allowance. * @param value - new cap value (absolute) */ function setReverseAggregatedAllowanceApproverCap(uint256 value) external; /** * @notice Sets limits for swap amount * FUnction will revert if following consitency check fails: `swapfee_ <= swapMin_ <= swapMax_` * @param swapMax_ : >= swap amount, applies for **OUTGOING** swap (= `swap(...)` call) * @param swapMin_ : <= swap amount, applies for **OUTGOING** swap (= `swap(...)` call) * @param swapFee_ : defines swap fee for **INCOMING** swap (= `reverseSwap(...)` call), and `refund(...)` */ function setLimits(uint256 swapMax_, uint256 swapMin_, uint256 swapFee_) external; /** * @notice Withdraws amount from contract's supply, which is supposed to be done exclusively for relocating funds to * another Bridge system, and **NO** other purpose. * @param targetAddress : address to send tokens to * @param amount : amount of tokens to withdraw */ function withdraw(address targetAddress, uint256 amount) external; /** * @dev Deposits funds back in to the contract supply. * Dedicated to increase contract's supply, usually(but not necessarily) after previous withdrawal from supply. * NOTE: This call needs preexisting ERC20 allowance >= `amount` for address of this Bridge contract as * recipient/beneficiary and Tx sender address as sender. * This means that address passed in as the Tx sender, must have already crated allowance by calling the * `ERC20.approve(from, ADDR_OF_BRIDGE_CONTRACT, amount)` *before* calling this(`deposit(...)`) call. * @param amount : deposit amount */ function deposit(uint256 amount) external; /** * @notice Withdraw fees accrued so far. * !IMPORTANT!: Current design of this contract does *NOT* allow to distinguish between *swap fees accrued* * and *excess funds* sent to the contract's address via *direct* `ERC20.transfer(...)`. * Implication is that excess funds **are treated** as swap fees. * The only way how to separate these two is off-chain, by replaying events from this and * Fet ERC20 contracts and do the reconciliation. * * @param targetAddress : address to send tokens to. */ function withdrawFees(address targetAddress) external; /** * @notice Delete the contract, transfers the remaining token and ether balance to the specified * payoutAddress * @param targetAddress address to transfer the balances to. Ensure that this is able to handle ERC20 tokens * @dev owner only + only on or after `earliestDelete` block */ function deleteContract(address payable targetAddress) external; } // Part: IBridge /** * @title Bi-directional bridge for transferring FET tokens between Ethereum and Fetch Mainnet-v2 * * @notice This bridge allows to transfer [ERC20-FET] tokens from Ethereum Mainnet to [Native FET] tokens on Fetch * Native Mainnet-v2 and **other way around** (= it is bi-directional). * User will be *charged* swap fee defined in counterpart contract deployed on Fetch Native Mainnet-v2. * In the case of a refund, user will be charged a swap fee configured in this contract. * * @dev There are three primary actions defining business logic of this contract: * * `swap(...)`: initiates swap of tokens from Ethereum to Fetch Native Mainnet-v2, callable by anyone (= users) * * `reverseSwap(...)`: finalises the swap of tokens in *opposite* direction = receives swap originally * initiated on Fetch Native Mainnet-v2, callable exclusively by `relayer` role * * `refund(...)`: refunds swap originally initiated in this contract(by `swap(...)` call), callable exclusively * by `relayer` role * * Swap Fees for `swap(...)` operations (direction from this contract to are handled by the counterpart contract on Fetch Native Mainnet-v2, **except** for refunds, for * which user is charged swap fee defined by this contract (since relayer needs to send refund transaction back to * this contract. * * ! IMPORTANT !: Current design of this contract does *NOT* allow to distinguish between *swap fees accrued* and * *excess funds* sent to the address of this contract via *direct* `ERC20.transfer(...)`. * Implication is, that excess funds **are treated** as swap fees. * The only way how to separate these two is to do it *off-chain*, by replaying events from this and FET ERC20 * contracts, and do the reconciliation. */ interface IBridge is IBridgePublic, IBridgeRelayer, IBridgeAdmin {} // File: Bridge.sol /** * @title Bi-directional bridge for transferring FET tokens between Ethereum and Fetch Mainnet-v2 * * @notice This bridge allows to transfer [ERC20-FET] tokens from Ethereum Mainnet to [Native FET] tokens on Fetch * Native Mainnet-v2 and **other way around** (= it is bi-directional). * User will be *charged* swap fee defined in counterpart contract deployed on Fetch Native Mainnet-v2. * In the case of a refund, user will be charged a swap fee configured in this contract. * * @dev There are three primary actions defining business logic of this contract: * * `swap(...)`: initiates swap of tokens from Ethereum to Fetch Native Mainnet-v2, callable by anyone (= users) * * `reverseSwap(...)`: finalises the swap of tokens in *opposite* direction = receives swap originally * initiated on Fetch Native Mainnet-v2, callable exclusively by `relayer` role * * `refund(...)`: refunds swap originally initiated in this contract(by `swap(...)` call), callable exclusively * by `relayer` role * * Swap Fees for `swap(...)` operations (direction from this contract to are handled by the counterpart contract on Fetch Native Mainnet-v2, **except** for refunds, for * which user is charged swap fee defined by this contract (since relayer needs to send refund transaction back to * this contract. * * ! IMPORTANT !: Current design of this contract does *NOT* allow to distinguish between *swap fees accrued* and * *excess funds* sent to the address of this contract via *direct* `ERC20.transfer(...)`. * Implication is, that excess funds **are treated** as swap fees. * The only way how to separate these two is to do it *off-chain*, by replaying events from this and FET ERC20 * contracts, and do the reconciliation. */ contract Bridge is IBridge, AccessControl { using SafeMath for uint256; /// @notice ********** CONSTANTS *********** bytes32 public constant APPROVER_ROLE = keccak256("APPROVER_ROLE"); bytes32 public constant MONITOR_ROLE = keccak256("MONITOR_ROLE"); bytes32 public constant RELAYER_ROLE = keccak256("RELAYER_ROLE"); /// @notice ******* IMMUTABLE STATE ******** IERC20Token public immutable token; uint256 public immutable earliestDelete; /// @notice ******** MUTABLE STATE ********* uint256 public supply; uint64 public nextSwapId; uint64 public relayEon; mapping(uint64 => uint256) public refunds; // swapId -> original swap amount(= *includes* swapFee) uint256 public swapMax; uint256 public swapMin; uint256 public cap; uint256 public swapFee; uint256 public pausedSinceBlockPublicApi; uint256 public pausedSinceBlockRelayerApi; uint256 public reverseAggregatedAllowance; uint256 public reverseAggregatedAllowanceApproverCap; /* Only callable by owner */ modifier onlyOwner() { require(_isOwner(), "Only admin role"); _; } modifier onlyRelayer() { require(hasRole(RELAYER_ROLE, msg.sender), "Only relayer role"); _; } modifier verifyTxRelayEon(uint64 relayEon_) { require(relayEon == relayEon_, "Tx doesn't belong to current relayEon"); _; } modifier canPause(uint256 pauseSinceBlockNumber) { if (pauseSinceBlockNumber > block.number) // Checking UN-pausing (the most critical operation) { require(_isOwner(), "Only admin role"); } else { require(hasRole(MONITOR_ROLE, msg.sender) || _isOwner(), "Only admin or monitor role"); } _; } modifier canSetReverseAggregatedAllowance(uint256 allowance) { if (allowance > reverseAggregatedAllowanceApproverCap) // Check for going over the approver cap (the most critical operation) { require(_isOwner(), "Only admin role"); } else { require(hasRole(APPROVER_ROLE, msg.sender) || _isOwner(), "Only admin or approver role"); } _; } modifier verifyPublicAPINotPaused() { require(pausedSinceBlockPublicApi > block.number, "Contract has been paused"); _verifyRelayerApiNotPaused(); _; } modifier verifyRelayerApiNotPaused() { _verifyRelayerApiNotPaused(); _; } modifier verifySwapAmount(uint256 amount) { // NOTE(pb): Commenting-out check against `swapFee` in order to spare gas for user's Tx, relying solely on check // against `swapMin` only, which is ensured to be `>= swapFee` (by `_setLimits(...)` function). //require(amount > swapFee, "Amount must be higher than fee"); require(amount >= swapMin, "Amount bellow lower limit"); require(amount <= swapMax, "Amount exceeds upper limit"); _; } modifier verifyReverseSwapAmount(uint256 amount) { require(amount <= swapMax, "Amount exceeds swap max limit"); _; } modifier verifyRefundSwapId(uint64 id) { require(id < nextSwapId, "Invalid swap id"); require(refunds[id] == 0, "Refund was already processed"); _; } /******************* Contract start *******************/ /** * @notice Contract constructor * @dev Input parameters offers full flexibility to configure the contract during deployment, with minimal need of * further setup transactions necessary to open contract to the public. * * @param ERC20Address - address of FET ERC20 token contract * @param cap_ - limits contract `supply` value from top * @param reverseAggregatedAllowance_ - allowance value which limits how much can refund & reverseSwap transfer * in aggregated form * @param reverseAggregatedAllowanceApproverCap_ - limits allowance value up to which can APPROVER_ROLE set * the allowance * @param swapMax_ - value representing UPPER limit which can be transferred (this value INCLUDES swapFee) * @param swapMin_ - value representing LOWER limit which can be transferred (this value INCLUDES swapFee) * @param swapFee_ - represents fee which user has to pay for swap execution, * @param pausedSinceBlockPublicApi_ - block number since which the Public API of the contract will be paused * @param pausedSinceBlockRelayerApi_ - block number since which the Relayer API of the contract will be paused * @param deleteProtectionPeriod_ - number of blocks(from contract deployment block) during which contract can * NOT be deleted */ constructor( address ERC20Address , uint256 cap_ , uint256 reverseAggregatedAllowance_ , uint256 reverseAggregatedAllowanceApproverCap_ , uint256 swapMax_ , uint256 swapMin_ , uint256 swapFee_ , uint256 pausedSinceBlockPublicApi_ , uint256 pausedSinceBlockRelayerApi_ , uint256 deleteProtectionPeriod_) { _setupRole(DEFAULT_ADMIN_ROLE, msg.sender); token = IERC20Token(ERC20Address); earliestDelete = block.number.add(deleteProtectionPeriod_); /// @dev Unnecessary initialisations, done implicitly by VM //supply = 0; //refundsFeesAccrued = 0; //nextSwapId = 0; // NOTE(pb): Initial value is by design set to MAX_LIMIT<uint64>, so that its NEXT increment(+1) will // overflow to 0. relayEon = type(uint64).max; _setCap(cap_); _setReverseAggregatedAllowance(reverseAggregatedAllowance_); _setReverseAggregatedAllowanceApproverCap(reverseAggregatedAllowanceApproverCap_); _setLimits(swapMax_, swapMin_, swapFee_); _pausePublicApiSince(pausedSinceBlockPublicApi_); _pauseRelayerApiSince(pausedSinceBlockRelayerApi_); } // ********************************************************** // *********** USER-LEVEL ACCESS METHODS ********** /** * @notice Initiates swap, which will be relayed to the other blockchain. * Swap might fail, if `destinationAddress` value is invalid (see bellow), in which case the swap will be * refunded back to user. Swap fee will be *WITHDRAWN* from `amount` in that case - please see details * in desc. for `refund(...)` call. * * @dev Swap call will create unique identifier (swap id), which is, by design, sequentially growing by 1 per each * new swap created, and so uniquely identifies each swap. This identifier is referred to as "reverse swap id" * on the other blockchain. * Callable by anyone. * * @param destinationAddress - address on **OTHER** blockchain where the swap effective amount will be transferred * in to. * User is **RESPONSIBLE** for providing the **CORRECT** and valid value. * The **CORRECT** means, in this context, that address is valid *AND* user really * intended this particular address value as destination = that address is NOT lets say * copy-paste mistake made by user. Reason being that when user provided valid address * value, but made mistake = address is of someone else (e.g. copy-paste mistake), then * there is **NOTHING** what can be done to recover funds back to user (= refund) once * the swap will be relayed to the other blockchain! * The **VALID** means that provided value successfully passes consistency checks of * valid address of **OTHER** blockchain. In the case when user provides invalid * address value, relayer will execute refund - please see desc. for `refund()` call * for more details. */ function swap( uint256 amount, // This is original amount (INCLUDES fee) string calldata destinationAddress ) external override verifyPublicAPINotPaused verifySwapAmount(amount) { supply = supply.add(amount); require(cap >= supply, "Swap would exceed cap"); token.transferFrom(msg.sender, address(this), amount); emit Swap(nextSwapId, msg.sender, destinationAddress, destinationAddress, amount); // NOTE(pb): No necessity to use SafeMath here: nextSwapId += 1; } /** * @notice Returns amount of excess FET ERC20 tokens which were sent to address of this contract via direct ERC20 * transfer (by calling ERC20.transfer(...)), without interacting with API of this contract, what can happen * only by mistake. * * @return targetAddress : address to send tokens to */ function getFeesAccrued() external view override returns(uint256) { // NOTE(pb): This subtraction shall NEVER fail: return token.balanceOf(address(this)).sub(supply, "Critical err: balance < supply"); } function getApproverRole() external view override returns(bytes32) {return APPROVER_ROLE;} function getMonitorRole() external view override returns(bytes32) {return MONITOR_ROLE;} function getRelayerRole() external view override returns(bytes32) {return RELAYER_ROLE;} function getToken() external view override returns(address) {return address(token);} function getEarliestDelete() external view override returns(uint256) {return earliestDelete;} function getSupply() external view override returns(uint256) {return supply;} function getNextSwapId() external view override returns(uint64) {return nextSwapId;} function getRelayEon() external view override returns(uint64) {return relayEon;} function getRefund(uint64 swap_id) external view override returns(uint256) {return refunds[swap_id];} function getSwapMax() external view override returns(uint256) {return swapMax;} function getSwapMin() external view override returns(uint256) {return swapMin;} function getCap() external view override returns(uint256) {return cap;} function getSwapFee() external view override returns(uint256) {return swapFee;} function getPausedSinceBlockPublicApi() external view override returns(uint256) {return pausedSinceBlockPublicApi;} function getPausedSinceBlockRelayerApi() external view override returns(uint256) {return pausedSinceBlockRelayerApi;} function getReverseAggregatedAllowance() external view override returns(uint256) {return reverseAggregatedAllowance;} function getReverseAggregatedAllowanceApproverCap() external view override returns(uint256) {return reverseAggregatedAllowanceApproverCap;} // ********************************************************** // *********** RELAYER-LEVEL ACCESS METHODS *********** /** * @notice Starts the new relay eon. * @dev Relay eon concept is part of the design in order to ensure safe management of hand-over between two * relayer services. It provides clean isolation of potentially still pending transactions from previous * relayer svc and the current one. */ function newRelayEon() external override verifyRelayerApiNotPaused onlyRelayer { // NOTE(pb): No need for safe math for this increment, since the MAX_LIMIT<uint64> is huge number (~10^19), // there is no way that +1 incrementing from initial 0 value can possibly cause overflow in real world - that // would require to send more than 10^19 transactions to reach that point. // The only case, where this increment operation will lead to overflow, by-design, is the **VERY 1st** // increment = very 1st call of this contract method, when the `relayEon` is by-design & intentionally // initialised to MAX_LIMIT<uint64> value, so the resulting value of the `relayEon` after increment will be `0` relayEon += 1; emit NewRelayEon(relayEon); } /** * @notice Refunds swap previously created by `swap(...)` call to this contract. The `swapFee` is *NOT* refunded * back to the user (this is by-design). * * @dev Callable exclusively by `relayer` role * * @param id - swap id to refund - must be swap id of swap originally created by `swap(...)` call to this contract, * **NOT** *reverse* swap id! * @param to - address where the refund will be transferred in to(IDENTICAL to address used in associated `swap` * call) * @param amount - original amount specified in associated `swap` call = it INCLUDES swap fee, which will be * withdrawn * @param relayEon_ - current relay eon, ensures safe management of relaying process */ function refund( uint64 id, address to, uint256 amount, uint64 relayEon_ ) external override verifyRelayerApiNotPaused verifyTxRelayEon(relayEon_) verifyReverseSwapAmount(amount) onlyRelayer verifyRefundSwapId(id) { // NOTE(pb): Fail as early as possible - withdrawal from aggregated allowance is most likely to fail comparing // to rest of the operations bellow. _updateReverseAggregatedAllowance(amount); supply = supply.sub(amount, "Amount exceeds contract supply"); // NOTE(pb): Same calls are repeated in both branches of the if-else in order to minimise gas impact, comparing // to implementation, where these calls would be present in the code just once, after if-else block. if (amount > swapFee) { // NOTE(pb): No need to use safe math here, the overflow is prevented by `if` condition above. uint256 effectiveAmount = amount - swapFee; token.transfer(to, effectiveAmount); emit SwapRefund(id, to, effectiveAmount, swapFee); } else { // NOTE(pb): No transfer necessary in this case, since whole amount is taken as swap fee. emit SwapRefund(id, to, 0, amount); } // NOTE(pb): Here we need to record the original `amount` value (passed as input param) rather than // `effectiveAmount` in order to make sure, that the value is **NOT** zero (so it is possible to detect // existence of key-value record in the `refunds` mapping (this is done in the `verifyRefundSwapId(...)` // modifier). This also means that relayer role shall call this `refund(...)` function only for `amount > 0`, // otherways relayer will pay Tx fee for executing the transaction which will have *NO* effect. refunds[id] = amount; } /** * @notice Refunds swap previously created by `swap(...)` call to this contract, where `swapFee` *IS* refunded * back to the user (= swap fee is waived = user will receive full `amount`). * Purpose of this method is to enable full refund in the situations when it si not user's fault that * swap needs to be refunded (e.g. when Fetch Native Mainnet-v2 will become unavailable for prolonged * period of time, etc. ...). * * @dev Callable exclusively by `relayer` role * * @param id - swap id to refund - must be swap id of swap originally created by `swap(...)` call to this contract, * **NOT** *reverse* swap id! * @param to - address where the refund will be transferred in to(IDENTICAL to address used in associated `swap` * call) * @param amount - original amount specified in associated `swap` call = it INCLUDES swap fee, which will be * waived = user will receive whole `amount` value. * Pleas mind that `amount > 0`, otherways relayer will pay Tx fee for executing the transaction * which will have *NO* effect (= like this function `refundInFull(...)` would *not* have been * called at all! * @param relayEon_ - current relay eon, ensures safe management of relaying process */ function refundInFull( uint64 id, address to, uint256 amount, uint64 relayEon_ ) external override verifyRelayerApiNotPaused verifyTxRelayEon(relayEon_) verifyReverseSwapAmount(amount) onlyRelayer verifyRefundSwapId(id) { // NOTE(pb): Fail as early as possible - withdrawal from aggregated allowance is most likely to fail comparing // to rest of the operations bellow. _updateReverseAggregatedAllowance(amount); supply = supply.sub(amount, "Amount exceeds contract supply"); token.transfer(to, amount); emit SwapRefund(id, to, amount, 0); // NOTE(pb): Here we need to record the original `amount` value (passed as input param) rather than // `effectiveAmount` in order to make sure, that the value is **NOT** zero (so it is possible to detect // existence of key-value record in the `refunds` mapping (this is done in the `verifyRefundSwapId(...)` // modifier). This also means that relayer role shall call this function function only for `amount > 0`, // otherways relayer will pay Tx fee for executing the transaction which will have *NO* effect. refunds[id] = amount; } /** * @notice Finalises swap initiated by counterpart contract on the other blockchain. * This call sends swapped tokens to `to` address value user specified in original swap on the **OTHER** * blockchain. * * @dev Callable exclusively by `relayer` role * * @param rid - reverse swap id - unique identifier of the swap initiated on the **OTHER** blockchain. * This id is, by definition, sequentially growing number incremented by 1 for each new swap initiated * the other blockchain. **However**, it is *NOT* ensured that *all* swaps from the other blockchain * will be transferred to this (Ethereum) blockchain, since some of these swaps can be refunded back * to users (on the other blockchain). * @param to - address where the refund will be transferred in to * @param from - source address from which user transferred tokens from on the other blockchain. Present primarily * for purposes of quick querying of events on this blockchain. * @param originTxHash - transaction hash for swap initiated on the **OTHER** blockchain. Present in order to * create strong bond between this and other blockchain. * @param amount - original amount specified in associated swap initiated on the other blockchain. * Swap fee is *withdrawn* from the `amount` user specified in the swap on the other blockchain, * what means that user receives `amount - swapFee`, or *nothing* if `amount <= swapFee`. * Pleas mind that `amount > 0`, otherways relayer will pay Tx fee for executing the transaction * which will have *NO* effect (= like this function `refundInFull(...)` would *not* have been * called at all! * @param relayEon_ - current relay eon, ensures safe management of relaying process */ function reverseSwap( uint64 rid, // Reverse swp id (from counterpart contract on other blockchain) address to, string calldata from, bytes32 originTxHash, uint256 amount, // This is original swap amount (= *includes* swapFee) uint64 relayEon_ ) external override verifyRelayerApiNotPaused verifyTxRelayEon(relayEon_) verifyReverseSwapAmount(amount) onlyRelayer { // NOTE(pb): Fail as early as possible - withdrawal from aggregated allowance is most likely to fail comparing // to rest of the operations bellow. _updateReverseAggregatedAllowance(amount); supply = supply.sub(amount, "Amount exceeds contract supply"); if (amount > swapFee) { // NOTE(pb): No need to use safe math here, the overflow is prevented by `if` condition above. uint256 effectiveAmount = amount - swapFee; token.transfer(to, effectiveAmount); emit ReverseSwap(rid, to, from, originTxHash, effectiveAmount, swapFee); } else { // NOTE(pb): No transfer, no contract supply change since whole amount is taken as swap fee. emit ReverseSwap(rid, to, from, originTxHash, 0, amount); } } // ********************************************************** // **** MONITOR/ADMIN-LEVEL ACCESS METHODS ***** /** * @notice Pauses Public API since the specified block number * @param blockNumber block number since which public interaction will be paused (for all * block.number >= blockNumber). * @dev Delegate only * If `blocknumber < block.number`, then contract will be paused immediately = from `block.number`. */ function pausePublicApiSince(uint256 blockNumber) external override canPause(blockNumber) { _pausePublicApiSince(blockNumber); } /** * @notice Pauses Relayer API since the specified block number * @param blockNumber block number since which Relayer API interaction will be paused (for all * block.number >= blockNumber). * @dev Delegate only * If `blocknumber < block.number`, then contract will be paused immediately = from `block.number`. */ function pauseRelayerApiSince(uint256 blockNumber) external override canPause(blockNumber) { _pauseRelayerApiSince(blockNumber); } // ********************************************************** // ************ ADMIN-LEVEL ACCESS METHODS ************* /** * @notice Mints provided amount of FET tokens. * This is to reflect changes in minted Native FET token supply on the Fetch Native Mainnet-v2 blockchain. * @param amount - number of FET tokens to mint. */ function mint(uint256 amount) external override onlyOwner { // NOTE(pb): The `supply` shall be adjusted by minted amount. supply = supply.add(amount); require(cap >= supply, "Minting would exceed the cap"); token.mint(address(this), amount); } /** * @notice Burns provided amount of FET tokens. * This is to reflect changes in minted Native FET token supply on the Fetch Native Mainnet-v2 blockchain. * @param amount - number of FET tokens to burn. */ function burn(uint256 amount) external override onlyOwner { // NOTE(pb): The `supply` shall be adjusted by burned amount. supply = supply.sub(amount, "Amount exceeds contract supply"); token.burn(amount); } /** * @notice Sets cap (max) value of `supply` this contract can hold = the value of tokens transferred to the other * blockchain. * This cap affects(limits) all operations which *increase* contract's `supply` value = `swap(...)` and * `mint(...)`. * @param value - new cap value. */ function setCap(uint256 value) external override onlyOwner { _setCap(value); } /** * @notice Sets value of `reverseAggregatedAllowance` state variable. * This affects(limits) operations which *decrease* contract's `supply` value via **RELAYER** authored * operations (= `reverseSwap(...)` and `refund(...)`). It does **NOT** affect **ADMINISTRATION** authored * supply decrease operations (= `withdraw(...)` & `burn(...)`). * @param value - new allowance value (absolute) */ function setReverseAggregatedAllowance(uint256 value) external override canSetReverseAggregatedAllowance(value) { _setReverseAggregatedAllowance(value); } /** * @notice Sets value of `reverseAggregatedAllowanceApproverCap` state variable. * This limits APPROVER_ROLE from top - value up to which can approver rise the allowance. * @param value - new cap value (absolute) */ function setReverseAggregatedAllowanceApproverCap(uint256 value) external override onlyOwner { _setReverseAggregatedAllowanceApproverCap(value); } /** * @notice Sets limits for swap amount * FUnction will revert if following consitency check fails: `swapfee_ <= swapMin_ <= swapMax_` * @param swapMax_ : >= swap amount, applies for **OUTGOING** swap (= `swap(...)` call) * @param swapMin_ : <= swap amount, applies for **OUTGOING** swap (= `swap(...)` call) * @param swapFee_ : defines swap fee for **INCOMING** swap (= `reverseSwap(...)` call), and `refund(...)` */ function setLimits( uint256 swapMax_, uint256 swapMin_, uint256 swapFee_ ) external override onlyOwner { _setLimits(swapMax_, swapMin_, swapFee_); } /** * @notice Withdraws amount from contract's supply, which is supposed to be done exclusively for relocating funds to * another Bridge system, and **NO** other purpose. * @param targetAddress : address to send tokens to * @param amount : amount of tokens to withdraw */ function withdraw( address targetAddress, uint256 amount ) external override onlyOwner { supply = supply.sub(amount, "Amount exceeds contract supply"); token.transfer(targetAddress, amount); emit Withdraw(targetAddress, amount); } /** * @dev Deposits funds back in to the contract supply. * Dedicated to increase contract's supply, usually(but not necessarily) after previous withdrawal from supply. * NOTE: This call needs preexisting ERC20 allowance >= `amount` for address of this Bridge contract as * recipient/beneficiary and Tx sender address as sender. * This means that address passed in as the Tx sender, must have already crated allowance by calling the * `ERC20.approve(from, ADDR_OF_BRIDGE_CONTRACT, amount)` *before* calling this(`deposit(...)`) call. * @param amount : deposit amount */ function deposit(uint256 amount) external override onlyOwner { supply = supply.add(amount); require(cap >= supply, "Deposit would exceed the cap"); token.transferFrom(msg.sender, address(this), amount); emit Deposit(msg.sender, amount); } /** * @notice Withdraw fees accrued so far. * !IMPORTANT!: Current design of this contract does *NOT* allow to distinguish between *swap fees accrued* * and *excess funds* sent to the contract's address via *direct* `ERC20.transfer(...)`. * Implication is that excess funds **are treated** as swap fees. * The only way how to separate these two is off-chain, by replaying events from this and * Fet ERC20 contracts and do the reconciliation. * * @param targetAddress : address to send tokens to. */ function withdrawFees(address targetAddress) external override onlyOwner { uint256 fees = this.getFeesAccrued(); require(fees > 0, "No fees to withdraw"); token.transfer(targetAddress, fees); emit FeesWithdrawal(targetAddress, fees); } /** * @notice Delete the contract, transfers the remaining token and ether balance to the specified * payoutAddress * @param targetAddress address to transfer the balances to. Ensure that this is able to handle ERC20 tokens * @dev owner only + only on or after `earliestDelete` block */ function deleteContract(address payable targetAddress) external override onlyOwner { require(earliestDelete <= block.number, "Earliest delete not reached"); require(targetAddress != address(this), "pay addr == this contract addr"); uint256 contractBalance = token.balanceOf(address(this)); token.transfer(targetAddress, contractBalance); emit DeleteContract(targetAddress, contractBalance); selfdestruct(targetAddress); } // ********************************************************** // ****************** INTERNAL METHODS ***************** function _isOwner() internal view returns(bool) { return hasRole(DEFAULT_ADMIN_ROLE, msg.sender); } function _verifyRelayerApiNotPaused() internal view { require(pausedSinceBlockRelayerApi > block.number, "Contract has been paused"); } /** * @notice Pauses Public API since the specified block number * @param blockNumber - block number since which interaction with Public API will be paused (for all * block.number >= blockNumber) */ function _pausePublicApiSince(uint256 blockNumber) internal { pausedSinceBlockPublicApi = blockNumber < block.number ? block.number : blockNumber; emit PausePublicApi(pausedSinceBlockPublicApi); } /** * @notice Pauses Relayer API since the specified block number * @param blockNumber - block number since which interaction with Relayer API will be paused (for all * block.number >= blockNumber) */ function _pauseRelayerApiSince(uint256 blockNumber) internal { pausedSinceBlockRelayerApi = blockNumber < block.number ? block.number : blockNumber; emit PauseRelayerApi(pausedSinceBlockRelayerApi); } function _setLimits( uint256 swapMax_, uint256 swapMin_, uint256 swapFee_ ) internal { require((swapFee_ <= swapMin_) && (swapMin_ <= swapMax_), "fee<=lower<=upper violated"); swapMax = swapMax_; swapMin = swapMin_; swapFee = swapFee_; emit LimitsUpdate(swapMax, swapMin, swapFee); } function _setCap(uint256 cap_) internal { cap = cap_; emit CapUpdate(cap); } function _setReverseAggregatedAllowance(uint256 allowance) internal { reverseAggregatedAllowance = allowance; emit ReverseAggregatedAllowanceUpdate(reverseAggregatedAllowance); } function _setReverseAggregatedAllowanceApproverCap(uint256 value) internal { reverseAggregatedAllowanceApproverCap = value; emit ReverseAggregatedAllowanceApproverCapUpdate(reverseAggregatedAllowanceApproverCap); } function _updateReverseAggregatedAllowance(uint256 amount) internal { reverseAggregatedAllowance = reverseAggregatedAllowance.sub(amount, "Operation exceeds reverse aggregated allowance"); } }
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
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
-----Decoded View---------------
Arg [0] : ERC20Address (address): 0xaea46A60368A7bD060eec7DF8CBa43b7EF41Ad85
Arg [1] : cap_ (uint256): 30000000000000000000000000
Arg [2] : reverseAggregatedAllowance_ (uint256): 1000000000000000000000000
Arg [3] : reverseAggregatedAllowanceApproverCap_ (uint256): 1000000000000000000000000
Arg [4] : swapMax_ (uint256): 3000000000000000000000000
Arg [5] : swapMin_ (uint256): 100000000000000000000
Arg [6] : swapFee_ (uint256): 50000000000000000000
Arg [7] : pausedSinceBlockPublicApi_ (uint256): 1393796574908163946345982392040522594123775
Arg [8] : pausedSinceBlockRelayerApi_ (uint256): 1393796574908163946345982392040522594123775
Arg [9] : deleteProtectionPeriod_ (uint256): 2427508
-----Encoded View---------------
10 Constructor Arguments found :
Arg [0] : 000000000000000000000000aea46a60368a7bd060eec7df8cba43b7ef41ad85
Arg [1] : 00000000000000000000000000000000000000000018d0bf423c03d8de000000
Arg [2] : 00000000000000000000000000000000000000000000d3c21bcecceda1000000
Arg [3] : 00000000000000000000000000000000000000000000d3c21bcecceda1000000
Arg [4] : 000000000000000000000000000000000000000000027b46536c66c8e3000000
Arg [5] : 0000000000000000000000000000000000000000000000056bc75e2d63100000
Arg [6] : 000000000000000000000000000000000000000000000002b5e3af16b1880000
Arg [7] : 00000000000000000000000000000fffffffffffffffffffffffffffffffffff
Arg [8] : 00000000000000000000000000000fffffffffffffffffffffffffffffffffff
Arg [9] : 0000000000000000000000000000000000000000000000000000000000250a74
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Multichain Portfolio | 30 Chains
Chain | Token | Portfolio % | Price | Amount | Value |
---|---|---|---|---|---|
ETH | 100.00% | $1.36 | 126,224,232.4113 | $171,664,956.08 |
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.