Contract Name:
BridgeBurnerV2
Contract Source Code:
// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.0;
import "./IBridge.sol";
import "./IWrappedToken.sol";
import "./IFeeV2.sol";
import "./BridgeBaseV2.sol";
contract BridgeBurnerV2 is BridgeBaseV2 {
IWrappedToken public token;
constructor(
IWrappedToken token_,
string memory name,
IBridge prev,
IFeeV2 fee,
ILimiter limiter
) BridgeBaseV2(name, prev, fee, limiter) {
token = token_;
}
function lock(uint256 amount) external payable override {
_beforeLock(amount);
token.burnFrom(_msgSender(), amount);
emit Locked(_msgSender(), amount);
}
function unlock(address account, uint256 amount, bytes32 hash) external override onlyOwner {
_setUnlockCompleted(hash);
token.mint(account, amount);
emit Unlocked(account, amount);
}
function renounceOwnership() public override onlyOwner {
_pause();
Ownable.renounceOwnership();
}
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.0;
interface IBridge {
event Locked(address indexed sender, uint256 amount);
event Unlocked(address indexed sender, uint256 amount);
function lock(uint256 amount) external payable;
function unlock(address account, uint256 amount, bytes32 hash) external;
function isUnlockCompleted(bytes32 hash) external view returns (bool);
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.0;
interface IWrappedToken {
function mint(address account, uint256 amount) external;
function burn(uint256 amount) external;
function burnFrom(address account, uint256 amount) external;
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.0;
interface IFeeV2 {
function calculate(address sender, uint256 amount) external view returns (uint256);
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.0;
import "./@openzeppelin/contracts/utils/Context.sol";
import "./@openzeppelin/contracts/security/Pausable.sol";
import "./@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "./@openzeppelin/contracts/access/Ownable.sol";
import "./IBridge.sol";
import "./IFeeV2.sol";
import "./ILimiter.sol";
abstract contract BridgeBaseV2 is IBridge, Ownable, Pausable, ReentrancyGuard {
string public name;
IBridge public prev; // migrate from
IFeeV2 public fee;
ILimiter public limiter;
mapping(bytes32 => bool) private _unlockedCompleted;
constructor(string memory name_, IBridge prev_, IFeeV2 fee_, ILimiter limiter_) {
name = name_;
prev = prev_;
fee = fee_;
limiter = limiter_;
}
receive() external payable {
revert();
}
function calculateFee(address sender, uint256 amount) public view returns (uint256) {
if (address(fee) == address(0)) {
return 0;
}
return fee.calculate(sender, amount);
}
function setFee(IFeeV2 fee_) external onlyOwner {
fee = fee_;
}
function getLimiterUsage() public view returns (uint256) {
if (address(limiter) == address(0)) {
return 0;
}
return limiter.getUsage(address(this));
}
function isLimited(uint256 amount) public view returns (bool) {
if (address(limiter) == address(0)) {
return false;
}
return limiter.isLimited(address(this), amount);
}
function setLimiter(ILimiter limiter_) external onlyOwner {
limiter = limiter_;
}
function _transferFee(uint256 amount) private nonReentrant {
uint256 calculatedFee = calculateFee(_msgSender(), amount);
if (calculatedFee == 0) {
return;
}
require(msg.value >= calculatedFee, "BridgeBase: not enough fee");
(bool success,) = owner().call{value : msg.value}("");
require(success, "BridgeBase: can not transfer fee");
}
function _checkLimit(uint256 amount) internal {
if (address(limiter) == address(0)) {
return;
}
limiter.increaseUsage(amount);
}
function _beforeLock(uint256 amount) internal whenNotPaused {
_checkLimit(amount);
_transferFee(amount);
}
function pause() external onlyOwner {
_pause();
}
function unpause() external onlyOwner {
_unpause();
}
function isUnlockCompleted(bytes32 hash) public view override returns (bool) {
if (address(prev) != address(0)) {
if (prev.isUnlockCompleted(hash)) {
return true;
}
}
return _unlockedCompleted[hash];
}
function _setUnlockCompleted(bytes32 hash) internal {
require(!isUnlockCompleted(hash), "BridgeBase: already unlocked");
_unlockedCompleted[hash] = true;
}
}
// SPDX-License-Identifier: MIT
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) {
this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
return msg.data;
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../utils/Context.sol";
/**
* @dev Contract module which allows children to implement an emergency stop
* mechanism that can be triggered by an authorized account.
*
* This module is used through inheritance. It will make available the
* modifiers `whenNotPaused` and `whenPaused`, which can be applied to
* the functions of your contract. Note that they will not be pausable by
* simply including this module, only once the modifiers are put in place.
*/
abstract contract Pausable is Context {
/**
* @dev Emitted when the pause is triggered by `account`.
*/
event Paused(address account);
/**
* @dev Emitted when the pause is lifted by `account`.
*/
event Unpaused(address account);
bool private _paused;
/**
* @dev Initializes the contract in unpaused state.
*/
constructor () {
_paused = false;
}
/**
* @dev Returns true if the contract is paused, and false otherwise.
*/
function paused() public view virtual returns (bool) {
return _paused;
}
/**
* @dev Modifier to make a function callable only when the contract is not paused.
*
* Requirements:
*
* - The contract must not be paused.
*/
modifier whenNotPaused() {
require(!paused(), "Pausable: paused");
_;
}
/**
* @dev Modifier to make a function callable only when the contract is paused.
*
* Requirements:
*
* - The contract must be paused.
*/
modifier whenPaused() {
require(paused(), "Pausable: not paused");
_;
}
/**
* @dev Triggers stopped state.
*
* Requirements:
*
* - The contract must not be paused.
*/
function _pause() internal virtual whenNotPaused {
_paused = true;
emit Paused(_msgSender());
}
/**
* @dev Returns to normal state.
*
* Requirements:
*
* - The contract must be paused.
*/
function _unpause() internal virtual whenPaused {
_paused = false;
emit Unpaused(_msgSender());
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @dev Contract module that helps prevent reentrant calls to a function.
*
* Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
* available, which can be applied to functions to make sure there are no nested
* (reentrant) calls to them.
*
* Note that because there is a single `nonReentrant` guard, functions marked as
* `nonReentrant` may not call one another. This can be worked around by making
* those functions `private`, and then adding `external` `nonReentrant` entry
* points to them.
*
* TIP: If you would like to learn more about reentrancy and alternative ways
* to protect against it, check out our blog post
* https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
*/
abstract contract ReentrancyGuard {
// Booleans are more expensive than uint256 or any type that takes up a full
// word because each write operation emits an extra SLOAD to first read the
// slot's contents, replace the bits taken up by the boolean, and then write
// back. This is the compiler's defense against contract upgrades and
// pointer aliasing, and it cannot be disabled.
// The values being non-zero value makes deployment a bit more expensive,
// but in exchange the refund on every call to nonReentrant will be lower in
// amount. Since refunds are capped to a percentage of the total
// transaction's gas, it is best to keep them low in cases like this one, to
// increase the likelihood of the full refund coming into effect.
uint256 private constant _NOT_ENTERED = 1;
uint256 private constant _ENTERED = 2;
uint256 private _status;
constructor () {
_status = _NOT_ENTERED;
}
/**
* @dev Prevents a contract from calling itself, directly or indirectly.
* Calling a `nonReentrant` function from another `nonReentrant`
* function is not supported. It is possible to prevent this from happening
* by making the `nonReentrant` function external, and make it call a
* `private` function that does the actual work.
*/
modifier nonReentrant() {
// On the first call to nonReentrant, _notEntered will be true
require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
// Any calls to nonReentrant after this point will fail
_status = _ENTERED;
_;
// By storing the original value once again, a refund is triggered (see
// https://eips.ethereum.org/EIPS/eip-2200)
_status = _NOT_ENTERED;
}
}
// SPDX-License-Identifier: MIT
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 () {
address msgSender = _msgSender();
_owner = msgSender;
emit OwnershipTransferred(address(0), 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 {
emit OwnershipTransferred(_owner, address(0));
_owner = 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");
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
}
// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.0;
interface ILimiter {
function getLimit(address bridge) external view returns (uint256);
function getUsage(address bridge) external view returns (uint256);
function isLimited(address bridge, uint256 amount) external view returns (bool);
function increaseUsage(uint256 amount) external;
}