/*
* Copyright (c) 2022, Circle Internet Financial Limited.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
pragma solidity 0.7.6;
/*
* Copyright (c) 2022, Circle Internet Financial Limited.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @title ITokenMinter
* @notice interface for minter of tokens that are mintable, burnable, and interchangeable
* across domains.
*/
interface ITokenMinter {
/**
* @notice Mints `amount` of local tokens corresponding to the
* given (`sourceDomain`, `burnToken`) pair, to `to` address.
* @dev reverts if the (`sourceDomain`, `burnToken`) pair does not
* map to a nonzero local token address. This mapping can be queried using
* getLocalToken().
* @param sourceDomain Source domain where `burnToken` was burned.
* @param burnToken Burned token address as bytes32.
* @param to Address to receive minted tokens, corresponding to `burnToken`,
* on this domain.
* @param amount Amount of tokens to mint. Must be less than or equal
* to the minterAllowance of this TokenMinter for given `_mintToken`.
* @return mintToken token minted.
*/
function mint(
uint32 sourceDomain,
bytes32 burnToken,
address to,
uint256 amount
) external returns (address mintToken);
/**
* @notice Burn tokens owned by this ITokenMinter.
* @param burnToken burnable token.
* @param amount amount of tokens to burn. Must be less than or equal to this ITokenMinter's
* account balance of the given `_burnToken`.
*/
function burn(address burnToken, uint256 amount) external;
/**
* @notice Get the local token associated with the given remote domain and token.
* @param remoteDomain Remote domain
* @param remoteToken Remote token
* @return local token address
*/
function getLocalToken(uint32 remoteDomain, bytes32 remoteToken)
external
view
returns (address);
/**
* @notice Set the token controller of this ITokenMinter. Token controller
* is responsible for mapping local tokens to remote tokens, and managing
* token-specific limits
* @param newTokenController new token controller address
*/
function setTokenController(address newTokenController) external;
}
/*
* Copyright (c) 2022, Circle Internet Financial Limited.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @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
);
}
/**
* @title IMintBurnToken
* @notice interface for mintable and burnable ERC20 token
*/
interface IMintBurnToken is IERC20 {
/**
* @dev Function to mint tokens
* @param to The address that will receive the minted tokens.
* @param amount The amount of tokens to mint. Must be less than or equal
* to the minterAllowance of the caller.
* @return A boolean that indicates if the operation was successful.
*/
function mint(address to, uint256 amount) external returns (bool);
/**
* @dev allows a minter to burn some of its own tokens
* Validates that caller is a minter and that sender is not blacklisted
* amount is less than or equal to the minter's account balance
* @param amount uint256 the amount of tokens to be burned
*/
function burn(uint256 amount) external;
}
/*
* Copyright (c) 2022, Circle Internet Financial Limited.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* @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;
}
}
/**
* @dev forked from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/7c5f6bc2c8743d83443fa46395d75f2f3f99054a/contracts/access/Ownable.sol
* Modifications:
* 1. Update Solidity version from 0.8.0 to 0.7.6 (11/9/2022). (v8 was used
* as base because it includes internal _transferOwnership method.)
* 2. Remove renounceOwnership function
*
* Description
* Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* specific functions.
*
* By default, the owner account will be the one that deploys the contract. This
* can later be changed with {transferOwnership}.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be applied to your functions to restrict their use to
* the owner.
*/
abstract contract Ownable is Context {
address private _owner;
event OwnershipTransferred(
address indexed previousOwner,
address indexed newOwner
);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor() {
_transferOwnership(_msgSender());
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
_checkOwner();
_;
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view virtual returns (address) {
return _owner;
}
/**
* @dev Throws if the sender is not the owner.
*/
function _checkOwner() internal view virtual {
require(owner() == _msgSender(), "Ownable: caller is not the owner");
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) public virtual onlyOwner {
require(
newOwner != address(0),
"Ownable: new owner is the zero address"
);
_transferOwnership(newOwner);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Internal function without access restriction.
*/
function _transferOwnership(address newOwner) internal virtual {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}
/**
* @dev forked from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/7c5f6bc2c8743d83443fa46395d75f2f3f99054a/contracts/access/Ownable2Step.sol
* Modifications:
* 1. Update Solidity version from 0.8.0 to 0.7.6. Version 0.8.0 was used
* as base because this contract was added to OZ repo after version 0.8.0.
*
* Contract module which provides 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} and {acceptOwnership}.
*
* This module is used through inheritance. It will make available all functions
* from parent (Ownable).
*/
abstract contract Ownable2Step is Ownable {
address private _pendingOwner;
event OwnershipTransferStarted(
address indexed previousOwner,
address indexed newOwner
);
/**
* @dev Returns the address of the pending owner.
*/
function pendingOwner() public view virtual returns (address) {
return _pendingOwner;
}
/**
* @dev Starts the ownership transfer of the contract to a new account. Replaces the pending transfer if there is one.
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner)
public
virtual
override
onlyOwner
{
_pendingOwner = newOwner;
emit OwnershipTransferStarted(owner(), newOwner);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`) and deletes any pending owner.
* Internal function without access restriction.
*/
function _transferOwnership(address newOwner) internal virtual override {
delete _pendingOwner;
super._transferOwnership(newOwner);
}
/**
* @dev The new owner accepts the ownership transfer.
*/
function acceptOwnership() external {
address sender = _msgSender();
require(
pendingOwner() == sender,
"Ownable2Step: caller is not the new owner"
);
_transferOwnership(sender);
}
}
/**
* @notice Base contract which allows children to implement an emergency stop
* mechanism
* @dev Forked from https://github.com/centrehq/centre-tokens/blob/0d3cab14ebd133a83fc834dbd48d0468bdf0b391/contracts/v1/Pausable.sol
* Modifications:
* 1. Update Solidity version from 0.6.12 to 0.7.6 (8/23/2022)
* 2. Change pauser visibility to private, declare external getter (11/19/22)
*/
contract Pausable is Ownable2Step {
event Pause();
event Unpause();
event PauserChanged(address indexed newAddress);
address private _pauser;
bool public paused = false;
/**
* @dev Modifier to make a function callable only when the contract is not paused.
*/
modifier whenNotPaused() {
require(!paused, "Pausable: paused");
_;
}
/**
* @dev throws if called by any account other than the pauser
*/
modifier onlyPauser() {
require(msg.sender == _pauser, "Pausable: caller is not the pauser");
_;
}
/**
* @notice Returns current pauser
* @return Pauser's address
*/
function pauser() external view returns (address) {
return _pauser;
}
/**
* @dev called by the owner to pause, triggers stopped state
*/
function pause() external onlyPauser {
paused = true;
emit Pause();
}
/**
* @dev called by the owner to unpause, returns to normal state
*/
function unpause() external onlyPauser {
paused = false;
emit Unpause();
}
/**
* @dev update the pauser role
*/
function updatePauser(address _newPauser) external onlyOwner {
require(
_newPauser != address(0),
"Pausable: new pauser is the zero address"
);
_pauser = _newPauser;
emit PauserChanged(_pauser);
}
}
/*
* Copyright (c) 2022, Circle Internet Financial Limited.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @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;
}
}
/**
* @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);
}
}
}
}
/**
* @title SafeERC20
* @dev Wrappers around ERC20 operations that throw on failure (when the token
* contract returns false). Tokens that return no value (and instead revert or
* throw on failure) are also supported, non-reverting calls are assumed to be
* successful.
* To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
* which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
*/
library SafeERC20 {
using SafeMath for uint256;
using Address for address;
function safeTransfer(
IERC20 token,
address to,
uint256 value
) internal {
_callOptionalReturn(
token,
abi.encodeWithSelector(token.transfer.selector, to, value)
);
}
function safeTransferFrom(
IERC20 token,
address from,
address to,
uint256 value
) internal {
_callOptionalReturn(
token,
abi.encodeWithSelector(token.transferFrom.selector, from, to, value)
);
}
/**
* @dev Deprecated. This function has issues similar to the ones found in
* {IERC20-approve}, and its usage is discouraged.
*
* Whenever possible, use {safeIncreaseAllowance} and
* {safeDecreaseAllowance} instead.
*/
function safeApprove(
IERC20 token,
address spender,
uint256 value
) internal {
// safeApprove should only be called when setting an initial allowance,
// or when resetting it to zero. To increase and decrease it, use
// 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
// solhint-disable-next-line max-line-length
require(
(value == 0) || (token.allowance(address(this), spender) == 0),
"SafeERC20: approve from non-zero to non-zero allowance"
);
_callOptionalReturn(
token,
abi.encodeWithSelector(token.approve.selector, spender, value)
);
}
function safeIncreaseAllowance(
IERC20 token,
address spender,
uint256 value
) internal {
uint256 newAllowance = token.allowance(address(this), spender).add(
value
);
_callOptionalReturn(
token,
abi.encodeWithSelector(
token.approve.selector,
spender,
newAllowance
)
);
}
function safeDecreaseAllowance(
IERC20 token,
address spender,
uint256 value
) internal {
uint256 newAllowance = token.allowance(address(this), spender).sub(
value,
"SafeERC20: decreased allowance below zero"
);
_callOptionalReturn(
token,
abi.encodeWithSelector(
token.approve.selector,
spender,
newAllowance
)
);
}
/**
* @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
* on the return value: the return value is optional (but if data is returned, it must not be false).
* @param token The token targeted by the call.
* @param data The call data (encoded using abi.encode or one of its variants).
*/
function _callOptionalReturn(IERC20 token, bytes memory data) private {
// We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
// we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
// the target address contains contract code and also asserts for success in the low-level call.
bytes memory returndata = address(token).functionCall(
data,
"SafeERC20: low-level call failed"
);
if (returndata.length > 0) {
// Return data is optional
// solhint-disable-next-line max-line-length
require(
abi.decode(returndata, (bool)),
"SafeERC20: ERC20 operation did not succeed"
);
}
}
}
/**
* @notice Base contract which allows children to rescue ERC20 locked in their contract.
* @dev Forked from https://github.com/centrehq/centre-tokens/blob/0d3cab14ebd133a83fc834dbd48d0468bdf0b391/contracts/v1.1/Rescuable.sol
* Modifications:
* 1. Update Solidity version from 0.6.12 to 0.7.6 (8/23/2022)
*/
contract Rescuable is Ownable2Step {
using SafeERC20 for IERC20;
address private _rescuer;
event RescuerChanged(address indexed newRescuer);
/**
* @notice Returns current rescuer
* @return Rescuer's address
*/
function rescuer() external view returns (address) {
return _rescuer;
}
/**
* @notice Revert if called by any account other than the rescuer.
*/
modifier onlyRescuer() {
require(msg.sender == _rescuer, "Rescuable: caller is not the rescuer");
_;
}
/**
* @notice Rescue ERC20 tokens locked up in this contract.
* @param tokenContract ERC20 token contract address
* @param to Recipient address
* @param amount Amount to withdraw
*/
function rescueERC20(
IERC20 tokenContract,
address to,
uint256 amount
) external onlyRescuer {
tokenContract.safeTransfer(to, amount);
}
/**
* @notice Assign the rescuer role to a given address.
* @param newRescuer New rescuer's address
*/
function updateRescuer(address newRescuer) external onlyOwner {
require(
newRescuer != address(0),
"Rescuable: new rescuer is the zero address"
);
_rescuer = newRescuer;
emit RescuerChanged(newRescuer);
}
}
/*
* Copyright (c) 2022, Circle Internet Financial Limited.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @title TokenController
* @notice Base contract which allows children to control tokens, including mapping
* address of local tokens to addresses of corresponding tokens on remote domains,
* and limiting the amount of each token that can be burned per message.
*/
abstract contract TokenController {
// ============ Events ============
/**
* @notice Emitted when a token pair is linked
* @param localToken local token to support
* @param remoteDomain remote domain
* @param remoteToken token on `remoteDomain` corresponding to `localToken`
*/
event TokenPairLinked(
address localToken,
uint32 remoteDomain,
bytes32 remoteToken
);
/**
* @notice Emitted when a token pair is unlinked
* @param localToken local token address
* @param remoteDomain remote domain
* @param remoteToken token on `remoteDomain` unlinked from `localToken`
*/
event TokenPairUnlinked(
address localToken,
uint32 remoteDomain,
bytes32 remoteToken
);
/**
* @notice Emitted when a burn limit per message is set for a particular token
* @param token local token address
* @param burnLimitPerMessage burn limit per message for `token`
*/
event SetBurnLimitPerMessage(
address indexed token,
uint256 burnLimitPerMessage
);
/**
* @notice Emitted when token controller is set
* @param tokenController token controller address set
*/
event SetTokenController(address tokenController);
// ============ State Variables ============
// Supported burnable tokens on the local domain
// local token (address) => maximum burn amounts per message
mapping(address => uint256) public burnLimitsPerMessage;
// Supported mintable tokens on remote domains, mapped to their corresponding local token
// hash(remote domain & remote token bytes32 address) => local token (address)
mapping(bytes32 => address) public remoteTokensToLocalTokens;
// Role with permission to manage token address mapping across domains, and per-message burn limits
address private _tokenController;
// ============ Modifiers ============
/**
* @dev Throws if called by any account other than the tokenController.
*/
modifier onlyTokenController() {
require(
msg.sender == _tokenController,
"Caller is not tokenController"
);
_;
}
/**
* @notice ensures that attempted burn does not exceed
* burn limit per-message for given `burnToken`.
* @dev reverts if allowed burn amount is 0, or burnAmount exceeds
* allowed burn amount.
* @param token address of token to burn
* @param amount amount of `token` to burn
*/
modifier onlyWithinBurnLimit(address token, uint256 amount) {
uint256 _allowedBurnAmount = burnLimitsPerMessage[token];
require(_allowedBurnAmount > 0, "Burn token not supported");
require(
amount <= _allowedBurnAmount,
"Burn amount exceeds per tx limit"
);
_;
}
// ============ Public/External Functions ============
/**
* @dev Returns the address of the tokenController
* @return address of the tokenController
*/
function tokenController() external view returns (address) {
return _tokenController;
}
/**
* @notice Links a pair of local and remote tokens to be supported by this TokenMinter.
* @dev Associates a (`remoteToken`, `localToken`) pair by updating remoteTokensToLocalTokens mapping.
* Reverts if the remote token (for the given `remoteDomain`) already maps to a nonzero local token.
* Note:
* - A remote token (on a certain remote domain) can only map to one local token, but many remote tokens
* can map to the same local token.
* - Setting a token pair does not enable the `localToken` (that requires calling setLocalTokenEnabledStatus.)
*/
function linkTokenPair(
address localToken,
uint32 remoteDomain,
bytes32 remoteToken
) external onlyTokenController {
bytes32 _remoteTokensKey = _hashRemoteDomainAndToken(
remoteDomain,
remoteToken
);
// remote token must not be already linked to a local token
require(
remoteTokensToLocalTokens[_remoteTokensKey] == address(0),
"Unable to link token pair"
);
remoteTokensToLocalTokens[_remoteTokensKey] = localToken;
emit TokenPairLinked(localToken, remoteDomain, remoteToken);
}
/**
* @notice Unlinks a pair of local and remote tokens for this TokenMinter.
* @dev Removes link from `remoteToken`, to `localToken` for given `remoteDomain`
* by updating remoteTokensToLocalTokens mapping.
* Reverts if the remote token (for the given `remoteDomain`) already maps to the zero address.
* Note:
* - A remote token (on a certain remote domain) can only map to one local token, but many remote tokens
* can map to the same local token.
* - Unlinking a token pair does not disable burning the `localToken` (that requires calling setMaxBurnAmountPerMessage.)
*/
function unlinkTokenPair(
address localToken,
uint32 remoteDomain,
bytes32 remoteToken
) external onlyTokenController {
bytes32 _remoteTokensKey = _hashRemoteDomainAndToken(
remoteDomain,
remoteToken
);
// remote token must be linked to a local token before unlink
require(
remoteTokensToLocalTokens[_remoteTokensKey] != address(0),
"Unable to unlink token pair"
);
delete remoteTokensToLocalTokens[_remoteTokensKey];
emit TokenPairUnlinked(localToken, remoteDomain, remoteToken);
}
/**
* @notice Sets the maximum burn amount per message for a given `localToken`.
* @dev Burns with amounts exceeding `burnLimitPerMessage` will revert. Mints do not
* respect this value, so if this limit is reduced, previously burned tokens will still
* be mintable.
* @param localToken Local token to set the maximum burn amount per message of.
* @param burnLimitPerMessage Maximum burn amount per message to set.
*/
function setMaxBurnAmountPerMessage(
address localToken,
uint256 burnLimitPerMessage
) external onlyTokenController {
burnLimitsPerMessage[localToken] = burnLimitPerMessage;
emit SetBurnLimitPerMessage(localToken, burnLimitPerMessage);
}
// ============ Internal Utils ============
/**
* @notice Set tokenController to `newTokenController`, and
* emit `SetTokenController` event.
* @dev newTokenController must be nonzero.
* @param newTokenController address of new token controller
*/
function _setTokenController(address newTokenController) internal {
require(
newTokenController != address(0),
"Invalid token controller address"
);
_tokenController = newTokenController;
emit SetTokenController(newTokenController);
}
/**
* @notice Get the enabled local token associated with the given remote domain and token.
* @param remoteDomain Remote domain
* @param remoteToken Remote token
* @return Local token address
*/
function _getLocalToken(uint32 remoteDomain, bytes32 remoteToken)
internal
view
returns (address)
{
bytes32 _remoteTokensKey = _hashRemoteDomainAndToken(
remoteDomain,
remoteToken
);
return remoteTokensToLocalTokens[_remoteTokensKey];
}
/**
* @notice hashes packed `_remoteDomain` and `_remoteToken`.
* @param remoteDomain Domain where message originated from
* @param remoteToken Address of remote token as bytes32
* @return keccak hash of packed remote domain and token
*/
function _hashRemoteDomainAndToken(uint32 remoteDomain, bytes32 remoteToken)
internal
pure
returns (bytes32)
{
return keccak256(abi.encodePacked(remoteDomain, remoteToken));
}
}
/*
* Copyright (c) 2022, Circle Internet Financial Limited.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @title IMessageHandler
* @notice Handles messages on destination domain forwarded from
* an IReceiver
*/
interface IMessageHandler {
/**
* @notice handles an incoming message from a Receiver
* @param sourceDomain the source domain of the message
* @param sender the sender of the message
* @param messageBody The message raw bytes
* @return success bool, true if successful
*/
function handleReceiveMessage(
uint32 sourceDomain,
bytes32 sender,
bytes calldata messageBody
) external returns (bool);
}
/*
* Copyright (c) 2022, Circle Internet Financial Limited.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @title IRelayer
* @notice Sends messages from source domain to destination domain
*/
interface IRelayer {
/**
* @notice Sends an outgoing message from the source domain.
* @dev Increment nonce, format the message, and emit `MessageSent` event with message information.
* @param destinationDomain Domain of destination chain
* @param recipient Address of message recipient on destination domain as bytes32
* @param messageBody Raw bytes content of message
* @return nonce reserved by message
*/
function sendMessage(
uint32 destinationDomain,
bytes32 recipient,
bytes calldata messageBody
) external returns (uint64);
/**
* @notice Sends an outgoing message from the source domain, with a specified caller on the
* destination domain.
* @dev Increment nonce, format the message, and emit `MessageSent` event with message information.
* WARNING: if the `destinationCaller` does not represent a valid address as bytes32, then it will not be possible
* to broadcast the message on the destination domain. This is an advanced feature, and the standard
* sendMessage() should be preferred for use cases where a specific destination caller is not required.
* @param destinationDomain Domain of destination chain
* @param recipient Address of message recipient on destination domain as bytes32
* @param destinationCaller caller on the destination domain, as bytes32
* @param messageBody Raw bytes content of message
* @return nonce reserved by message
*/
function sendMessageWithCaller(
uint32 destinationDomain,
bytes32 recipient,
bytes32 destinationCaller,
bytes calldata messageBody
) external returns (uint64);
/**
* @notice Replace a message with a new message body and/or destination caller.
* @dev The `originalAttestation` must be a valid attestation of `originalMessage`.
* @param originalMessage original message to replace
* @param originalAttestation attestation of `originalMessage`
* @param newMessageBody new message body of replaced message
* @param newDestinationCaller the new destination caller
*/
function replaceMessage(
bytes calldata originalMessage,
bytes calldata originalAttestation,
bytes calldata newMessageBody,
bytes32 newDestinationCaller
) external;
}
/*
* Copyright (c) 2022, Circle Internet Financial Limited.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @title IReceiver
* @notice Receives messages on destination chain and forwards them to IMessageDestinationHandler
*/
interface IReceiver {
/**
* @notice Receives an incoming message, validating the header and passing
* the body to application-specific handler.
* @param message The message raw bytes
* @param signature The message signature
* @return success bool, true if successful
*/
function receiveMessage(bytes calldata message, bytes calldata signature)
external
returns (bool success);
}
/**
* @title IMessageTransmitter
* @notice Interface for message transmitters, which both relay and receive messages.
*/
interface IMessageTransmitter is IRelayer, IReceiver {
}
/*
* Copyright (c) 2022, Circle Internet Financial Limited.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
library TypedMemView {
using SafeMath for uint256;
// Why does this exist?
// the solidity `bytes memory` type has a few weaknesses.
// 1. You can't index ranges effectively
// 2. You can't slice without copying
// 3. The underlying data may represent any type
// 4. Solidity never deallocates memory, and memory costs grow
// superlinearly
// By using a memory view instead of a `bytes memory` we get the following
// advantages:
// 1. Slices are done on the stack, by manipulating the pointer
// 2. We can index arbitrary ranges and quickly convert them to stack types
// 3. We can insert type info into the pointer, and typecheck at runtime
// This makes `TypedMemView` a useful tool for efficient zero-copy
// algorithms.
// Why bytes29?
// We want to avoid confusion between views, digests, and other common
// types so we chose a large and uncommonly used odd number of bytes
//
// Note that while bytes are left-aligned in a word, integers and addresses
// are right-aligned. This means when working in assembly we have to
// account for the 3 unused bytes on the righthand side
//
// First 5 bytes are a type flag.
// - ff_ffff_fffe is reserved for unknown type.
// - ff_ffff_ffff is reserved for invalid types/errors.
// next 12 are memory address
// next 12 are len
// bottom 3 bytes are empty
// Assumptions:
// - non-modification of memory.
// - No Solidity updates
// - - wrt free mem point
// - - wrt bytes representation in memory
// - - wrt memory addressing in general
// Usage:
// - create type constants
// - use `assertType` for runtime type assertions
// - - unfortunately we can't do this at compile time yet :(
// - recommended: implement modifiers that perform type checking
// - - e.g.
// - - `uint40 constant MY_TYPE = 3;`
// - - ` modifer onlyMyType(bytes29 myView) { myView.assertType(MY_TYPE); }`
// - instantiate a typed view from a bytearray using `ref`
// - use `index` to inspect the contents of the view
// - use `slice` to create smaller views into the same memory
// - - `slice` can increase the offset
// - - `slice can decrease the length`
// - - must specify the output type of `slice`
// - - `slice` will return a null view if you try to overrun
// - - make sure to explicitly check for this with `notNull` or `assertType`
// - use `equal` for typed comparisons.
// The null view
bytes29 public constant NULL =
hex"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffff";
uint256 constant LOW_12_MASK = 0xffffffffffffffffffffffff;
uint8 constant TWELVE_BYTES = 96;
/**
* @notice Returns the encoded hex character that represents the lower 4 bits of the argument.
* @param _b The byte
* @return char - The encoded hex character
*/
function nibbleHex(uint8 _b) internal pure returns (uint8 char) {
// This can probably be done more efficiently, but it's only in error
// paths, so we don't really care :)
uint8 _nibble = _b | 0xf0; // set top 4, keep bottom 4
if (_nibble == 0xf0) {
return 0x30;
} // 0
if (_nibble == 0xf1) {
return 0x31;
} // 1
if (_nibble == 0xf2) {
return 0x32;
} // 2
if (_nibble == 0xf3) {
return 0x33;
} // 3
if (_nibble == 0xf4) {
return 0x34;
} // 4
if (_nibble == 0xf5) {
return 0x35;
} // 5
if (_nibble == 0xf6) {
return 0x36;
} // 6
if (_nibble == 0xf7) {
return 0x37;
} // 7
if (_nibble == 0xf8) {
return 0x38;
} // 8
if (_nibble == 0xf9) {
return 0x39;
} // 9
if (_nibble == 0xfa) {
return 0x61;
} // a
if (_nibble == 0xfb) {
return 0x62;
} // b
if (_nibble == 0xfc) {
return 0x63;
} // c
if (_nibble == 0xfd) {
return 0x64;
} // d
if (_nibble == 0xfe) {
return 0x65;
} // e
if (_nibble == 0xff) {
return 0x66;
} // f
}
/**
* @notice Returns a uint16 containing the hex-encoded byte.
* @param _b The byte
* @return encoded - The hex-encoded byte
*/
function byteHex(uint8 _b) internal pure returns (uint16 encoded) {
encoded |= nibbleHex(_b >> 4); // top 4 bits
encoded <<= 8;
encoded |= nibbleHex(_b); // lower 4 bits
}
/**
* @notice Encodes the uint256 to hex. `first` contains the encoded top 16 bytes.
* `second` contains the encoded lower 16 bytes.
*
* @param _b The 32 bytes as uint256
* @return first - The top 16 bytes
* @return second - The bottom 16 bytes
*/
function encodeHex(uint256 _b)
internal
pure
returns (uint256 first, uint256 second)
{
for (uint8 i = 31; i > 15; i -= 1) {
uint8 _byte = uint8(_b >> (i * 8));
first |= byteHex(_byte);
if (i != 16) {
first <<= 16;
}
}
// abusing underflow here =_=
for (uint8 i = 15; i < 255; i -= 1) {
uint8 _byte = uint8(_b >> (i * 8));
second |= byteHex(_byte);
if (i != 0) {
second <<= 16;
}
}
}
/**
* @notice Changes the endianness of a uint256.
* @dev https://graphics.stanford.edu/~seander/bithacks.html#ReverseParallel
* @param _b The unsigned integer to reverse
* @return v - The reversed value
*/
function reverseUint256(uint256 _b) internal pure returns (uint256 v) {
v = _b;
// swap bytes
v =
((v >> 8) &
0x00FF00FF00FF00FF00FF00FF00FF00FF00FF00FF00FF00FF00FF00FF00FF00FF) |
((v &
0x00FF00FF00FF00FF00FF00FF00FF00FF00FF00FF00FF00FF00FF00FF00FF00FF) <<
8);
// swap 2-byte long pairs
v =
((v >> 16) &
0x0000FFFF0000FFFF0000FFFF0000FFFF0000FFFF0000FFFF0000FFFF0000FFFF) |
((v &
0x0000FFFF0000FFFF0000FFFF0000FFFF0000FFFF0000FFFF0000FFFF0000FFFF) <<
16);
// swap 4-byte long pairs
v =
((v >> 32) &
0x00000000FFFFFFFF00000000FFFFFFFF00000000FFFFFFFF00000000FFFFFFFF) |
((v &
0x00000000FFFFFFFF00000000FFFFFFFF00000000FFFFFFFF00000000FFFFFFFF) <<
32);
// swap 8-byte long pairs
v =
((v >> 64) &
0x0000000000000000FFFFFFFFFFFFFFFF0000000000000000FFFFFFFFFFFFFFFF) |
((v &
0x0000000000000000FFFFFFFFFFFFFFFF0000000000000000FFFFFFFFFFFFFFFF) <<
64);
// swap 16-byte long pairs
v = (v >> 128) | (v << 128);
}
/**
* @notice Create a mask with the highest `_len` bits set.
* @param _len The length
* @return mask - The mask
*/
function leftMask(uint8 _len) private pure returns (uint256 mask) {
// ugly. redo without assembly?
assembly {
// solium-disable-previous-line security/no-inline-assembly
mask := sar(
sub(_len, 1),
0x8000000000000000000000000000000000000000000000000000000000000000
)
}
}
/**
* @notice Return the null view.
* @return bytes29 - The null view
*/
function nullView() internal pure returns (bytes29) {
return NULL;
}
/**
* @notice Check if the view is null.
* @return bool - True if the view is null
*/
function isNull(bytes29 memView) internal pure returns (bool) {
return memView == NULL;
}
/**
* @notice Check if the view is not null.
* @return bool - True if the view is not null
*/
function notNull(bytes29 memView) internal pure returns (bool) {
return !isNull(memView);
}
/**
* @notice Check if the view is of a valid type and points to a valid location
* in memory.
* @dev We perform this check by examining solidity's unallocated memory
* pointer and ensuring that the view's upper bound is less than that.
* @param memView The view
* @return ret - True if the view is valid
*/
function isValid(bytes29 memView) internal pure returns (bool ret) {
if (typeOf(memView) == 0xffffffffff) {
return false;
}
uint256 _end = end(memView);
assembly {
// solium-disable-previous-line security/no-inline-assembly
ret := not(gt(_end, mload(0x40)))
}
}
/**
* @notice Require that a typed memory view be valid.
* @dev Returns the view for easy chaining.
* @param memView The view
* @return bytes29 - The validated view
*/
function assertValid(bytes29 memView) internal pure returns (bytes29) {
require(isValid(memView), "Validity assertion failed");
return memView;
}
/**
* @notice Return true if the memview is of the expected type. Otherwise false.
* @param memView The view
* @param _expected The expected type
* @return bool - True if the memview is of the expected type
*/
function isType(bytes29 memView, uint40 _expected)
internal
pure
returns (bool)
{
return typeOf(memView) == _expected;
}
/**
* @notice Require that a typed memory view has a specific type.
* @dev Returns the view for easy chaining.
* @param memView The view
* @param _expected The expected type
* @return bytes29 - The view with validated type
*/
function assertType(bytes29 memView, uint40 _expected)
internal
pure
returns (bytes29)
{
if (!isType(memView, _expected)) {
(, uint256 g) = encodeHex(uint256(typeOf(memView)));
(, uint256 e) = encodeHex(uint256(_expected));
string memory err = string(
abi.encodePacked(
"Type assertion failed. Got 0x",
uint80(g),
". Expected 0x",
uint80(e)
)
);
revert(err);
}
return memView;
}
/**
* @notice Return an identical view with a different type.
* @param memView The view
* @param _newType The new type
* @return newView - The new view with the specified type
*/
function castTo(bytes29 memView, uint40 _newType)
internal
pure
returns (bytes29 newView)
{
// then | in the new type
assembly {
// solium-disable-previous-line security/no-inline-assembly
// shift off the top 5 bytes
newView := or(newView, shr(40, shl(40, memView)))
newView := or(newView, shl(216, _newType))
}
}
/**
* @notice Unsafe raw pointer construction. This should generally not be called
* directly. Prefer `ref` wherever possible.
* @dev Unsafe raw pointer construction. This should generally not be called
* directly. Prefer `ref` wherever possible.
* @param _type The type
* @param _loc The memory address
* @param _len The length
* @return newView - The new view with the specified type, location and length
*/
function unsafeBuildUnchecked(
uint256 _type,
uint256 _loc,
uint256 _len
) private pure returns (bytes29 newView) {
assembly {
// solium-disable-previous-line security/no-inline-assembly
newView := shl(96, or(newView, _type)) // insert type
newView := shl(96, or(newView, _loc)) // insert loc
newView := shl(24, or(newView, _len)) // empty bottom 3 bytes
}
}
/**
* @notice Instantiate a new memory view. This should generally not be called
* directly. Prefer `ref` wherever possible.
* @dev Instantiate a new memory view. This should generally not be called
* directly. Prefer `ref` wherever possible.
* @param _type The type
* @param _loc The memory address
* @param _len The length
* @return newView - The new view with the specified type, location and length
*/
function build(
uint256 _type,
uint256 _loc,
uint256 _len
) internal pure returns (bytes29 newView) {
uint256 _end = _loc.add(_len);
assembly {
// solium-disable-previous-line security/no-inline-assembly
if gt(_end, mload(0x40)) {
_end := 0
}
}
if (_end == 0) {
return NULL;
}
newView = unsafeBuildUnchecked(_type, _loc, _len);
}
/**
* @notice Instantiate a memory view from a byte array.
* @dev Note that due to Solidity memory representation, it is not possible to
* implement a deref, as the `bytes` type stores its len in memory.
* @param arr The byte array
* @param newType The type
* @return bytes29 - The memory view
*/
function ref(bytes memory arr, uint40 newType)
internal
pure
returns (bytes29)
{
uint256 _len = arr.length;
uint256 _loc;
assembly {
// solium-disable-previous-line security/no-inline-assembly
_loc := add(arr, 0x20) // our view is of the data, not the struct
}
return build(newType, _loc, _len);
}
/**
* @notice Return the associated type information.
* @param memView The memory view
* @return _type - The type associated with the view
*/
function typeOf(bytes29 memView) internal pure returns (uint40 _type) {
assembly {
// solium-disable-previous-line security/no-inline-assembly
// 216 == 256 - 40
_type := shr(216, memView) // shift out lower 24 bytes
}
}
/**
* @notice Optimized type comparison. Checks that the 5-byte type flag is equal.
* @param left The first view
* @param right The second view
* @return bool - True if the 5-byte type flag is equal
*/
function sameType(bytes29 left, bytes29 right)
internal
pure
returns (bool)
{
return (left ^ right) >> (2 * TWELVE_BYTES) == 0;
}
/**
* @notice Return the memory address of the underlying bytes.
* @param memView The view
* @return _loc - The memory address
*/
function loc(bytes29 memView) internal pure returns (uint96 _loc) {
uint256 _mask = LOW_12_MASK; // assembly can't use globals
assembly {
// solium-disable-previous-line security/no-inline-assembly
// 120 bits = 12 bytes (the encoded loc) + 3 bytes (empty low space)
_loc := and(shr(120, memView), _mask)
}
}
/**
* @notice The number of memory words this memory view occupies, rounded up.
* @param memView The view
* @return uint256 - The number of memory words
*/
function words(bytes29 memView) internal pure returns (uint256) {
return uint256(len(memView)).add(32) / 32;
}
/**
* @notice The in-memory footprint of a fresh copy of the view.
* @param memView The view
* @return uint256 - The in-memory footprint of a fresh copy of the view.
*/
function footprint(bytes29 memView) internal pure returns (uint256) {
return words(memView) * 32;
}
/**
* @notice The number of bytes of the view.
* @param memView The view
* @return _len - The length of the view
*/
function len(bytes29 memView) internal pure returns (uint96 _len) {
uint256 _mask = LOW_12_MASK; // assembly can't use globals
assembly {
// solium-disable-previous-line security/no-inline-assembly
_len := and(shr(24, memView), _mask)
}
}
/**
* @notice Returns the endpoint of `memView`.
* @param memView The view
* @return uint256 - The endpoint of `memView`
*/
function end(bytes29 memView) internal pure returns (uint256) {
return loc(memView) + len(memView);
}
/**
* @notice Safe slicing without memory modification.
* @param memView The view
* @param _index The start index
* @param _len The length
* @param newType The new type
* @return bytes29 - The new view
*/
function slice(
bytes29 memView,
uint256 _index,
uint256 _len,
uint40 newType
) internal pure returns (bytes29) {
uint256 _loc = loc(memView);
// Ensure it doesn't overrun the view
if (_loc.add(_index).add(_len) > end(memView)) {
return NULL;
}
_loc = _loc.add(_index);
return build(newType, _loc, _len);
}
/**
* @notice Shortcut to `slice`. Gets a view representing the first `_len` bytes.
* @param memView The view
* @param _len The length
* @param newType The new type
* @return bytes29 - The new view
*/
function prefix(
bytes29 memView,
uint256 _len,
uint40 newType
) internal pure returns (bytes29) {
return slice(memView, 0, _len, newType);
}
/**
* @notice Shortcut to `slice`. Gets a view representing the last `_len` byte.
* @param memView The view
* @param _len The length
* @param newType The new type
* @return bytes29 - The new view
*/
function postfix(
bytes29 memView,
uint256 _len,
uint40 newType
) internal pure returns (bytes29) {
return slice(memView, uint256(len(memView)).sub(_len), _len, newType);
}
/**
* @notice Construct an error message for an indexing overrun.
* @param _loc The memory address
* @param _len The length
* @param _index The index
* @param _slice The slice where the overrun occurred
* @return err - The err
*/
function indexErrOverrun(
uint256 _loc,
uint256 _len,
uint256 _index,
uint256 _slice
) internal pure returns (string memory err) {
(, uint256 a) = encodeHex(_loc);
(, uint256 b) = encodeHex(_len);
(, uint256 c) = encodeHex(_index);
(, uint256 d) = encodeHex(_slice);
err = string(
abi.encodePacked(
"TypedMemView/index - Overran the view. Slice is at 0x",
uint48(a),
" with length 0x",
uint48(b),
". Attempted to index at offset 0x",
uint48(c),
" with length 0x",
uint48(d),
"."
)
);
}
/**
* @notice Load up to 32 bytes from the view onto the stack.
* @dev Returns a bytes32 with only the `_bytes` highest bytes set.
* This can be immediately cast to a smaller fixed-length byte array.
* To automatically cast to an integer, use `indexUint`.
* @param memView The view
* @param _index The index
* @param _bytes The bytes
* @return result - The 32 byte result
*/
function index(
bytes29 memView,
uint256 _index,
uint8 _bytes
) internal pure returns (bytes32 result) {
if (_bytes == 0) {
return bytes32(0);
}
if (_index.add(_bytes) > len(memView)) {
revert(
indexErrOverrun(
loc(memView),
len(memView),
_index,
uint256(_bytes)
)
);
}
require(
_bytes <= 32,
"TypedMemView/index - Attempted to index more than 32 bytes"
);
uint8 bitLength = _bytes * 8;
uint256 _loc = loc(memView);
uint256 _mask = leftMask(bitLength);
assembly {
// solium-disable-previous-line security/no-inline-assembly
result := and(mload(add(_loc, _index)), _mask)
}
}
/**
* @notice Parse an unsigned integer from the view at `_index`.
* @dev Requires that the view have >= `_bytes` bytes following that index.
* @param memView The view
* @param _index The index
* @param _bytes The bytes
* @return result - The unsigned integer
*/
function indexUint(
bytes29 memView,
uint256 _index,
uint8 _bytes
) internal pure returns (uint256 result) {
return uint256(index(memView, _index, _bytes)) >> ((32 - _bytes) * 8);
}
/**
* @notice Parse an unsigned integer from LE bytes.
* @param memView The view
* @param _index The index
* @param _bytes The bytes
* @return result - The unsigned integer
*/
function indexLEUint(
bytes29 memView,
uint256 _index,
uint8 _bytes
) internal pure returns (uint256 result) {
return reverseUint256(uint256(index(memView, _index, _bytes)));
}
/**
* @notice Parse an address from the view at `_index`. Requires that the view have >= 20 bytes
* following that index.
* @param memView The view
* @param _index The index
* @return address - The address
*/
function indexAddress(bytes29 memView, uint256 _index)
internal
pure
returns (address)
{
return address(uint160(indexUint(memView, _index, 20)));
}
/**
* @notice Return the keccak256 hash of the underlying memory
* @param memView The view
* @return digest - The keccak256 hash of the underlying memory
*/
function keccak(bytes29 memView) internal pure returns (bytes32 digest) {
uint256 _loc = loc(memView);
uint256 _len = len(memView);
assembly {
// solium-disable-previous-line security/no-inline-assembly
digest := keccak256(_loc, _len)
}
}
/**
* @notice Return the sha2 digest of the underlying memory.
* @dev We explicitly deallocate memory afterwards.
* @param memView The view
* @return digest - The sha2 hash of the underlying memory
*/
function sha2(bytes29 memView) internal view returns (bytes32 digest) {
uint256 _loc = loc(memView);
uint256 _len = len(memView);
assembly {
// solium-disable-previous-line security/no-inline-assembly
let ptr := mload(0x40)
pop(staticcall(gas(), 2, _loc, _len, ptr, 0x20)) // sha2 #1
digest := mload(ptr)
}
}
/**
* @notice Implements bitcoin's hash160 (rmd160(sha2()))
* @param memView The pre-image
* @return digest - the Digest
*/
function hash160(bytes29 memView) internal view returns (bytes20 digest) {
uint256 _loc = loc(memView);
uint256 _len = len(memView);
assembly {
// solium-disable-previous-line security/no-inline-assembly
let ptr := mload(0x40)
pop(staticcall(gas(), 2, _loc, _len, ptr, 0x20)) // sha2
pop(staticcall(gas(), 3, ptr, 0x20, ptr, 0x20)) // rmd160
digest := mload(add(ptr, 0xc)) // return value is 0-prefixed.
}
}
/**
* @notice Implements bitcoin's hash256 (double sha2)
* @param memView A view of the preimage
* @return digest - the Digest
*/
function hash256(bytes29 memView) internal view returns (bytes32 digest) {
uint256 _loc = loc(memView);
uint256 _len = len(memView);
assembly {
// solium-disable-previous-line security/no-inline-assembly
let ptr := mload(0x40)
pop(staticcall(gas(), 2, _loc, _len, ptr, 0x20)) // sha2 #1
pop(staticcall(gas(), 2, ptr, 0x20, ptr, 0x20)) // sha2 #2
digest := mload(ptr)
}
}
/**
* @notice Return true if the underlying memory is equal. Else false.
* @param left The first view
* @param right The second view
* @return bool - True if the underlying memory is equal
*/
function untypedEqual(bytes29 left, bytes29 right)
internal
pure
returns (bool)
{
return
(loc(left) == loc(right) && len(left) == len(right)) ||
keccak(left) == keccak(right);
}
/**
* @notice Return false if the underlying memory is equal. Else true.
* @param left The first view
* @param right The second view
* @return bool - False if the underlying memory is equal
*/
function untypedNotEqual(bytes29 left, bytes29 right)
internal
pure
returns (bool)
{
return !untypedEqual(left, right);
}
/**
* @notice Compares type equality.
* @dev Shortcuts if the pointers are identical, otherwise compares type and digest.
* @param left The first view
* @param right The second view
* @return bool - True if the types are the same
*/
function equal(bytes29 left, bytes29 right) internal pure returns (bool) {
return
left == right ||
(typeOf(left) == typeOf(right) && keccak(left) == keccak(right));
}
/**
* @notice Compares type inequality.
* @dev Shortcuts if the pointers are identical, otherwise compares type and digest.
* @param left The first view
* @param right The second view
* @return bool - True if the types are not the same
*/
function notEqual(bytes29 left, bytes29 right)
internal
pure
returns (bool)
{
return !equal(left, right);
}
/**
* @notice Copy the view to a location, return an unsafe memory reference
* @dev Super Dangerous direct memory access.
*
* This reference can be overwritten if anything else modifies memory (!!!).
* As such it MUST be consumed IMMEDIATELY.
* This function is private to prevent unsafe usage by callers.
* @param memView The view
* @param _newLoc The new location
* @return written - the unsafe memory reference
*/
function unsafeCopyTo(bytes29 memView, uint256 _newLoc)
private
view
returns (bytes29 written)
{
require(notNull(memView), "TypedMemView/copyTo - Null pointer deref");
require(
isValid(memView),
"TypedMemView/copyTo - Invalid pointer deref"
);
uint256 _len = len(memView);
uint256 _oldLoc = loc(memView);
uint256 ptr;
assembly {
// solium-disable-previous-line security/no-inline-assembly
ptr := mload(0x40)
// revert if we're writing in occupied memory
if gt(ptr, _newLoc) {
revert(0x60, 0x20) // empty revert message
}
// use the identity precompile to copy
// guaranteed not to fail, so pop the success
pop(staticcall(gas(), 4, _oldLoc, _len, _newLoc, _len))
}
written = unsafeBuildUnchecked(typeOf(memView), _newLoc, _len);
}
/**
* @notice Copies the referenced memory to a new loc in memory, returning a `bytes` pointing to
* the new memory
* @dev Shortcuts if the pointers are identical, otherwise compares type and digest.
* @param memView The view
* @return ret - The view pointing to the new memory
*/
function clone(bytes29 memView) internal view returns (bytes memory ret) {
uint256 ptr;
uint256 _len = len(memView);
assembly {
// solium-disable-previous-line security/no-inline-assembly
ptr := mload(0x40) // load unused memory pointer
ret := ptr
}
unsafeCopyTo(memView, ptr + 0x20);
assembly {
// solium-disable-previous-line security/no-inline-assembly
mstore(0x40, add(add(ptr, _len), 0x20)) // write new unused pointer
mstore(ptr, _len) // write len of new array (in bytes)
}
}
/**
* @notice Join the views in memory, return an unsafe reference to the memory.
* @dev Super Dangerous direct memory access.
*
* This reference can be overwritten if anything else modifies memory (!!!).
* As such it MUST be consumed IMMEDIATELY.
* This function is private to prevent unsafe usage by callers.
* @param memViews The views
* @return unsafeView - The conjoined view pointing to the new memory
*/
function unsafeJoin(bytes29[] memory memViews, uint256 _location)
private
view
returns (bytes29 unsafeView)
{
assembly {
// solium-disable-previous-line security/no-inline-assembly
let ptr := mload(0x40)
// revert if we're writing in occupied memory
if gt(ptr, _location) {
revert(0x60, 0x20) // empty revert message
}
}
uint256 _offset = 0;
for (uint256 i = 0; i < memViews.length; i++) {
bytes29 memView = memViews[i];
unsafeCopyTo(memView, _location + _offset);
_offset += len(memView);
}
unsafeView = unsafeBuildUnchecked(0, _location, _offset);
}
/**
* @notice Produce the keccak256 digest of the concatenated contents of multiple views.
* @param memViews The views
* @return bytes32 - The keccak256 digest
*/
function joinKeccak(bytes29[] memory memViews)
internal
view
returns (bytes32)
{
uint256 ptr;
assembly {
// solium-disable-previous-line security/no-inline-assembly
ptr := mload(0x40) // load unused memory pointer
}
return keccak(unsafeJoin(memViews, ptr));
}
/**
* @notice Produce the sha256 digest of the concatenated contents of multiple views.
* @param memViews The views
* @return bytes32 - The sha256 digest
*/
function joinSha2(bytes29[] memory memViews)
internal
view
returns (bytes32)
{
uint256 ptr;
assembly {
// solium-disable-previous-line security/no-inline-assembly
ptr := mload(0x40) // load unused memory pointer
}
return sha2(unsafeJoin(memViews, ptr));
}
/**
* @notice copies all views, joins them into a new bytearray.
* @param memViews The views
* @return ret - The new byte array
*/
function join(bytes29[] memory memViews)
internal
view
returns (bytes memory ret)
{
uint256 ptr;
assembly {
// solium-disable-previous-line security/no-inline-assembly
ptr := mload(0x40) // load unused memory pointer
}
bytes29 _newView = unsafeJoin(memViews, ptr + 0x20);
uint256 _written = len(_newView);
uint256 _footprint = footprint(_newView);
assembly {
// solium-disable-previous-line security/no-inline-assembly
// store the legnth
mstore(ptr, _written)
// new pointer is old + 0x20 + the footprint of the body
mstore(0x40, add(add(ptr, _footprint), 0x20))
ret := ptr
}
}
}
/**
* @title BurnMessage Library
* @notice Library for formatted BurnMessages used by TokenMessenger.
* @dev BurnMessage format:
* Field Bytes Type Index
* version 4 uint32 0
* burnToken 32 bytes32 4
* mintRecipient 32 bytes32 36
* amount 32 uint256 68
* messageSender 32 bytes32 100
**/
library BurnMessage {
using TypedMemView for bytes;
using TypedMemView for bytes29;
uint8 private constant VERSION_INDEX = 0;
uint8 private constant VERSION_LEN = 4;
uint8 private constant BURN_TOKEN_INDEX = 4;
uint8 private constant BURN_TOKEN_LEN = 32;
uint8 private constant MINT_RECIPIENT_INDEX = 36;
uint8 private constant MINT_RECIPIENT_LEN = 32;
uint8 private constant AMOUNT_INDEX = 68;
uint8 private constant AMOUNT_LEN = 32;
uint8 private constant MSG_SENDER_INDEX = 100;
uint8 private constant MSG_SENDER_LEN = 32;
// 4 byte version + 32 bytes burnToken + 32 bytes mintRecipient + 32 bytes amount + 32 bytes messageSender
uint8 private constant BURN_MESSAGE_LEN = 132;
/**
* @notice Formats Burn message
* @param _version The message body version
* @param _burnToken The burn token address on source domain as bytes32
* @param _mintRecipient The mint recipient address as bytes32
* @param _amount The burn amount
* @param _messageSender The message sender
* @return Burn formatted message.
*/
function _formatMessage(
uint32 _version,
bytes32 _burnToken,
bytes32 _mintRecipient,
uint256 _amount,
bytes32 _messageSender
) internal pure returns (bytes memory) {
return
abi.encodePacked(
_version,
_burnToken,
_mintRecipient,
_amount,
_messageSender
);
}
/**
* @notice Retrieves the burnToken from a DepositForBurn BurnMessage
* @param _message The message
* @return sourceToken address as bytes32
*/
function _getMessageSender(bytes29 _message)
internal
pure
returns (bytes32)
{
return _message.index(MSG_SENDER_INDEX, MSG_SENDER_LEN);
}
/**
* @notice Retrieves the burnToken from a DepositForBurn BurnMessage
* @param _message The message
* @return sourceToken address as bytes32
*/
function _getBurnToken(bytes29 _message) internal pure returns (bytes32) {
return _message.index(BURN_TOKEN_INDEX, BURN_TOKEN_LEN);
}
/**
* @notice Retrieves the mintRecipient from a BurnMessage
* @param _message The message
* @return mintRecipient
*/
function _getMintRecipient(bytes29 _message)
internal
pure
returns (bytes32)
{
return _message.index(MINT_RECIPIENT_INDEX, MINT_RECIPIENT_LEN);
}
/**
* @notice Retrieves the amount from a BurnMessage
* @param _message The message
* @return amount
*/
function _getAmount(bytes29 _message) internal pure returns (uint256) {
return _message.indexUint(AMOUNT_INDEX, AMOUNT_LEN);
}
/**
* @notice Retrieves the version from a Burn message
* @param _message The message
* @return version
*/
function _getVersion(bytes29 _message) internal pure returns (uint32) {
return uint32(_message.indexUint(VERSION_INDEX, VERSION_LEN));
}
/**
* @notice Reverts if burn message is malformed or invalid length
* @param _message The burn message as bytes29
*/
function _validateBurnMessageFormat(bytes29 _message) internal pure {
require(_message.isValid(), "Malformed message");
require(_message.len() == BURN_MESSAGE_LEN, "Invalid message length");
}
}
/*
* Copyright (c) 2022, Circle Internet Financial Limited.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @title Message Library
* @notice Library for formatted messages used by Relayer and Receiver.
*
* @dev The message body is dynamically-sized to support custom message body
* formats. Other fields must be fixed-size to avoid hash collisions.
* Each other input value has an explicit type to guarantee fixed-size.
* Padding: uintNN fields are left-padded, and bytesNN fields are right-padded.
*
* Field Bytes Type Index
* version 4 uint32 0
* sourceDomain 4 uint32 4
* destinationDomain 4 uint32 8
* nonce 8 uint64 12
* sender 32 bytes32 20
* recipient 32 bytes32 52
* destinationCaller 32 bytes32 84
* messageBody dynamic bytes 116
*
**/
library Message {
using TypedMemView for bytes;
using TypedMemView for bytes29;
// Indices of each field in message
uint8 private constant VERSION_INDEX = 0;
uint8 private constant SOURCE_DOMAIN_INDEX = 4;
uint8 private constant DESTINATION_DOMAIN_INDEX = 8;
uint8 private constant NONCE_INDEX = 12;
uint8 private constant SENDER_INDEX = 20;
uint8 private constant RECIPIENT_INDEX = 52;
uint8 private constant DESTINATION_CALLER_INDEX = 84;
uint8 private constant MESSAGE_BODY_INDEX = 116;
/**
* @notice Returns formatted (packed) message with provided fields
* @param _msgVersion the version of the message format
* @param _msgSourceDomain Domain of home chain
* @param _msgDestinationDomain Domain of destination chain
* @param _msgNonce Destination-specific nonce
* @param _msgSender Address of sender on source chain as bytes32
* @param _msgRecipient Address of recipient on destination chain as bytes32
* @param _msgDestinationCaller Address of caller on destination chain as bytes32
* @param _msgRawBody Raw bytes of message body
* @return Formatted message
**/
function _formatMessage(
uint32 _msgVersion,
uint32 _msgSourceDomain,
uint32 _msgDestinationDomain,
uint64 _msgNonce,
bytes32 _msgSender,
bytes32 _msgRecipient,
bytes32 _msgDestinationCaller,
bytes memory _msgRawBody
) internal pure returns (bytes memory) {
return
abi.encodePacked(
_msgVersion,
_msgSourceDomain,
_msgDestinationDomain,
_msgNonce,
_msgSender,
_msgRecipient,
_msgDestinationCaller,
_msgRawBody
);
}
// @notice Returns _message's version field
function _version(bytes29 _message) internal pure returns (uint32) {
return uint32(_message.indexUint(VERSION_INDEX, 4));
}
// @notice Returns _message's sourceDomain field
function _sourceDomain(bytes29 _message) internal pure returns (uint32) {
return uint32(_message.indexUint(SOURCE_DOMAIN_INDEX, 4));
}
// @notice Returns _message's destinationDomain field
function _destinationDomain(bytes29 _message)
internal
pure
returns (uint32)
{
return uint32(_message.indexUint(DESTINATION_DOMAIN_INDEX, 4));
}
// @notice Returns _message's nonce field
function _nonce(bytes29 _message) internal pure returns (uint64) {
return uint64(_message.indexUint(NONCE_INDEX, 8));
}
// @notice Returns _message's sender field
function _sender(bytes29 _message) internal pure returns (bytes32) {
return _message.index(SENDER_INDEX, 32);
}
// @notice Returns _message's recipient field
function _recipient(bytes29 _message) internal pure returns (bytes32) {
return _message.index(RECIPIENT_INDEX, 32);
}
// @notice Returns _message's destinationCaller field
function _destinationCaller(bytes29 _message)
internal
pure
returns (bytes32)
{
return _message.index(DESTINATION_CALLER_INDEX, 32);
}
// @notice Returns _message's messageBody field
function _messageBody(bytes29 _message) internal pure returns (bytes29) {
return
_message.slice(
MESSAGE_BODY_INDEX,
_message.len() - MESSAGE_BODY_INDEX,
0
);
}
/**
* @notice converts address to bytes32 (alignment preserving cast.)
* @param addr the address to convert to bytes32
*/
function addressToBytes32(address addr) external pure returns (bytes32) {
return bytes32(uint256(uint160(addr)));
}
/**
* @notice converts bytes32 to address (alignment preserving cast.)
* @dev Warning: it is possible to have different input values _buf map to the same address.
* For use cases where this is not acceptable, validate that the first 12 bytes of _buf are zero-padding.
* @param _buf the bytes32 to convert to address
*/
function bytes32ToAddress(bytes32 _buf) public pure returns (address) {
return address(uint160(uint256(_buf)));
}
/**
* @notice Reverts if message is malformed or incorrect length
* @param _message The message as bytes29
*/
function _validateMessageFormat(bytes29 _message) internal pure {
require(_message.isValid(), "Malformed message");
require(
_message.len() >= MESSAGE_BODY_INDEX,
"Invalid message: too short"
);
}
}
/**
* @title TokenMessenger
* @notice Sends messages and receives messages to/from MessageTransmitters
* and to/from TokenMinters
*/
contract TokenMessenger is IMessageHandler, Rescuable {
// ============ Events ============
/**
* @notice Emitted when a DepositForBurn message is sent
* @param nonce unique nonce reserved by message
* @param burnToken address of token burnt on source domain
* @param amount deposit amount
* @param depositor address where deposit is transferred from
* @param mintRecipient address receiving minted tokens on destination domain as bytes32
* @param destinationDomain destination domain
* @param destinationTokenMessenger address of TokenMessenger on destination domain as bytes32
* @param destinationCaller authorized caller as bytes32 of receiveMessage() on destination domain, if not equal to bytes32(0).
* If equal to bytes32(0), any address can call receiveMessage().
*/
event DepositForBurn(
uint64 indexed nonce,
address indexed burnToken,
uint256 amount,
address indexed depositor,
bytes32 mintRecipient,
uint32 destinationDomain,
bytes32 destinationTokenMessenger,
bytes32 destinationCaller
);
/**
* @notice Emitted when tokens are minted
* @param mintRecipient recipient address of minted tokens
* @param amount amount of minted tokens
* @param mintToken contract address of minted token
*/
event MintAndWithdraw(
address indexed mintRecipient,
uint256 amount,
address indexed mintToken
);
/**
* @notice Emitted when a remote TokenMessenger is added
* @param domain remote domain
* @param tokenMessenger TokenMessenger on remote domain
*/
event RemoteTokenMessengerAdded(uint32 domain, bytes32 tokenMessenger);
/**
* @notice Emitted when a remote TokenMessenger is removed
* @param domain remote domain
* @param tokenMessenger TokenMessenger on remote domain
*/
event RemoteTokenMessengerRemoved(uint32 domain, bytes32 tokenMessenger);
/**
* @notice Emitted when the local minter is added
* @param localMinter address of local minter
* @notice Emitted when the local minter is added
*/
event LocalMinterAdded(address localMinter);
/**
* @notice Emitted when the local minter is removed
* @param localMinter address of local minter
* @notice Emitted when the local minter is removed
*/
event LocalMinterRemoved(address localMinter);
// ============ Libraries ============
using TypedMemView for bytes;
using TypedMemView for bytes29;
using BurnMessage for bytes29;
using Message for bytes29;
// ============ State Variables ============
// Local Message Transmitter responsible for sending and receiving messages to/from remote domains
IMessageTransmitter public immutable localMessageTransmitter;
// Version of message body format
uint32 public immutable messageBodyVersion;
// Minter responsible for minting and burning tokens on the local domain
ITokenMinter public localMinter;
// Valid TokenMessengers on remote domains
mapping(uint32 => bytes32) public remoteTokenMessengers;
// ============ Modifiers ============
/**
* @notice Only accept messages from a registered TokenMessenger contract on given remote domain
* @param domain The remote domain
* @param tokenMessenger The address of the TokenMessenger contract for the given remote domain
*/
modifier onlyRemoteTokenMessenger(uint32 domain, bytes32 tokenMessenger) {
require(
_isRemoteTokenMessenger(domain, tokenMessenger),
"Remote TokenMessenger unsupported"
);
_;
}
/**
* @notice Only accept messages from the registered message transmitter on local domain
*/
modifier onlyLocalMessageTransmitter() {
// Caller must be the registered message transmitter for this domain
require(_isLocalMessageTransmitter(), "Invalid message transmitter");
_;
}
// ============ Constructor ============
/**
* @param _messageTransmitter Message transmitter address
* @param _messageBodyVersion Message body version
*/
constructor(address _messageTransmitter, uint32 _messageBodyVersion) {
require(
_messageTransmitter != address(0),
"MessageTransmitter not set"
);
localMessageTransmitter = IMessageTransmitter(_messageTransmitter);
messageBodyVersion = _messageBodyVersion;
}
// ============ External Functions ============
/**
* @notice Deposits and burns tokens from sender to be minted on destination domain.
* Emits a `DepositForBurn` event.
* @dev reverts if:
* - given burnToken is not supported
* - given destinationDomain has no TokenMessenger registered
* - transferFrom() reverts. For example, if sender's burnToken balance or approved allowance
* to this contract is less than `amount`.
* - burn() reverts. For example, if `amount` is 0.
* - MessageTransmitter returns false or reverts.
* @param amount amount of tokens to burn
* @param destinationDomain destination domain
* @param mintRecipient address of mint recipient on destination domain
* @param burnToken address of contract to burn deposited tokens, on local domain
* @return _nonce unique nonce reserved by message
*/
function depositForBurn(
uint256 amount,
uint32 destinationDomain,
bytes32 mintRecipient,
address burnToken
) external returns (uint64 _nonce) {
return
_depositForBurn(
amount,
destinationDomain,
mintRecipient,
burnToken,
// (bytes32(0) here indicates that any address can call receiveMessage()
// on the destination domain, triggering mint to specified `mintRecipient`)
bytes32(0)
);
}
/**
* @notice Deposits and burns tokens from sender to be minted on destination domain. The mint
* on the destination domain must be called by `destinationCaller`.
* WARNING: if the `destinationCaller` does not represent a valid address as bytes32, then it will not be possible
* to broadcast the message on the destination domain. This is an advanced feature, and the standard
* depositForBurn() should be preferred for use cases where a specific destination caller is not required.
* Emits a `DepositForBurn` event.
* @dev reverts if:
* - given destinationCaller is zero address
* - given burnToken is not supported
* - given destinationDomain has no TokenMessenger registered
* - transferFrom() reverts. For example, if sender's burnToken balance or approved allowance
* to this contract is less than `amount`.
* - burn() reverts. For example, if `amount` is 0.
* - MessageTransmitter returns false or reverts.
* @param amount amount of tokens to burn
* @param destinationDomain destination domain
* @param mintRecipient address of mint recipient on destination domain
* @param burnToken address of contract to burn deposited tokens, on local domain
* @param destinationCaller caller on the destination domain, as bytes32
* @return nonce unique nonce reserved by message
*/
function depositForBurnWithCaller(
uint256 amount,
uint32 destinationDomain,
bytes32 mintRecipient,
address burnToken,
bytes32 destinationCaller
) external returns (uint64 nonce) {
// Destination caller must be nonzero. To allow any destination caller, use depositForBurn().
require(destinationCaller != bytes32(0), "Invalid destination caller");
return
_depositForBurn(
amount,
destinationDomain,
mintRecipient,
burnToken,
destinationCaller
);
}
/**
* @notice Replace a BurnMessage to change the mint recipient and/or
* destination caller. Allows the sender of a previous BurnMessage
* (created by depositForBurn or depositForBurnWithCaller)
* to send a new BurnMessage to replace the original.
* The new BurnMessage will reuse the amount and burn token of the original,
* without requiring a new deposit.
* @dev The new message will reuse the original message's nonce. For a
* given nonce, all replacement message(s) and the original message are
* valid to broadcast on the destination domain, until the first message
* at the nonce confirms, at which point all others are invalidated.
* Note: The msg.sender of the replaced message must be the same as the
* msg.sender of the original message.
* @param originalMessage original message bytes (to replace)
* @param originalAttestation original attestation bytes
* @param newDestinationCaller the new destination caller, which may be the
* same as the original destination caller, a new destination caller, or an empty
* destination caller (bytes32(0), indicating that any destination caller is valid.)
* @param newMintRecipient the new mint recipient, which may be the same as the
* original mint recipient, or different.
*/
function replaceDepositForBurn(
bytes calldata originalMessage,
bytes calldata originalAttestation,
bytes32 newDestinationCaller,
bytes32 newMintRecipient
) external {
bytes29 _originalMsg = originalMessage.ref(0);
_originalMsg._validateMessageFormat();
bytes29 _originalMsgBody = _originalMsg._messageBody();
_originalMsgBody._validateBurnMessageFormat();
bytes32 _originalMsgSender = _originalMsgBody._getMessageSender();
// _originalMsgSender must match msg.sender of original message
require(
msg.sender == Message.bytes32ToAddress(_originalMsgSender),
"Invalid sender for message"
);
require(
newMintRecipient != bytes32(0),
"Mint recipient must be nonzero"
);
bytes32 _burnToken = _originalMsgBody._getBurnToken();
uint256 _amount = _originalMsgBody._getAmount();
bytes memory _newMessageBody = BurnMessage._formatMessage(
messageBodyVersion,
_burnToken,
newMintRecipient,
_amount,
_originalMsgSender
);
localMessageTransmitter.replaceMessage(
originalMessage,
originalAttestation,
_newMessageBody,
newDestinationCaller
);
emit DepositForBurn(
_originalMsg._nonce(),
Message.bytes32ToAddress(_burnToken),
_amount,
msg.sender,
newMintRecipient,
_originalMsg._destinationDomain(),
_originalMsg._recipient(),
newDestinationCaller
);
}
/**
* @notice Handles an incoming message received by the local MessageTransmitter,
* and takes the appropriate action. For a burn message, mints the
* associated token to the requested recipient on the local domain.
* @dev Validates the local sender is the local MessageTransmitter, and the
* remote sender is a registered remote TokenMessenger for `remoteDomain`.
* @param remoteDomain The domain where the message originated from.
* @param sender The sender of the message (remote TokenMessenger).
* @param messageBody The message body bytes.
* @return success Bool, true if successful.
*/
function handleReceiveMessage(
uint32 remoteDomain,
bytes32 sender,
bytes calldata messageBody
)
external
override
onlyLocalMessageTransmitter
onlyRemoteTokenMessenger(remoteDomain, sender)
returns (bool)
{
bytes29 _msg = messageBody.ref(0);
_msg._validateBurnMessageFormat();
require(
_msg._getVersion() == messageBodyVersion,
"Invalid message body version"
);
bytes32 _mintRecipient = _msg._getMintRecipient();
bytes32 _burnToken = _msg._getBurnToken();
uint256 _amount = _msg._getAmount();
ITokenMinter _localMinter = _getLocalMinter();
_mintAndWithdraw(
address(_localMinter),
remoteDomain,
_burnToken,
Message.bytes32ToAddress(_mintRecipient),
_amount
);
return true;
}
/**
* @notice Add the TokenMessenger for a remote domain.
* @dev Reverts if there is already a TokenMessenger set for domain.
* @param domain Domain of remote TokenMessenger.
* @param tokenMessenger Address of remote TokenMessenger as bytes32.
*/
function addRemoteTokenMessenger(uint32 domain, bytes32 tokenMessenger)
external
onlyOwner
{
require(tokenMessenger != bytes32(0), "bytes32(0) not allowed");
require(
remoteTokenMessengers[domain] == bytes32(0),
"TokenMessenger already set"
);
remoteTokenMessengers[domain] = tokenMessenger;
emit RemoteTokenMessengerAdded(domain, tokenMessenger);
}
/**
* @notice Remove the TokenMessenger for a remote domain.
* @dev Reverts if there is no TokenMessenger set for `domain`.
* @param domain Domain of remote TokenMessenger
*/
function removeRemoteTokenMessenger(uint32 domain) external onlyOwner {
// No TokenMessenger set for given remote domain.
require(
remoteTokenMessengers[domain] != bytes32(0),
"No TokenMessenger set"
);
bytes32 _removedTokenMessenger = remoteTokenMessengers[domain];
delete remoteTokenMessengers[domain];
emit RemoteTokenMessengerRemoved(domain, _removedTokenMessenger);
}
/**
* @notice Add minter for the local domain.
* @dev Reverts if a minter is already set for the local domain.
* @param newLocalMinter The address of the minter on the local domain.
*/
function addLocalMinter(address newLocalMinter) external onlyOwner {
require(newLocalMinter != address(0), "Zero address not allowed");
require(
address(localMinter) == address(0),
"Local minter is already set."
);
localMinter = ITokenMinter(newLocalMinter);
emit LocalMinterAdded(newLocalMinter);
}
/**
* @notice Remove the minter for the local domain.
* @dev Reverts if the minter of the local domain is not set.
*/
function removeLocalMinter() external onlyOwner {
address _localMinterAddress = address(localMinter);
require(_localMinterAddress != address(0), "No local minter is set.");
delete localMinter;
emit LocalMinterRemoved(_localMinterAddress);
}
// ============ Internal Utils ============
/**
* @notice Deposits and burns tokens from sender to be minted on destination domain.
* Emits a `DepositForBurn` event.
* @param _amount amount of tokens to burn (must be non-zero)
* @param _destinationDomain destination domain
* @param _mintRecipient address of mint recipient on destination domain
* @param _burnToken address of contract to burn deposited tokens, on local domain
* @param _destinationCaller caller on the destination domain, as bytes32
* @return nonce unique nonce reserved by message
*/
function _depositForBurn(
uint256 _amount,
uint32 _destinationDomain,
bytes32 _mintRecipient,
address _burnToken,
bytes32 _destinationCaller
) internal returns (uint64 nonce) {
require(_amount > 0, "Amount must be nonzero");
require(_mintRecipient != bytes32(0), "Mint recipient must be nonzero");
bytes32 _destinationTokenMessenger = _getRemoteTokenMessenger(
_destinationDomain
);
ITokenMinter _localMinter = _getLocalMinter();
IMintBurnToken _mintBurnToken = IMintBurnToken(_burnToken);
require(
_mintBurnToken.transferFrom(
msg.sender,
address(_localMinter),
_amount
),
"Transfer operation failed"
);
_localMinter.burn(_burnToken, _amount);
// Format message body
bytes memory _burnMessage = BurnMessage._formatMessage(
messageBodyVersion,
Message.addressToBytes32(_burnToken),
_mintRecipient,
_amount,
Message.addressToBytes32(msg.sender)
);
uint64 _nonceReserved = _sendDepositForBurnMessage(
_destinationDomain,
_destinationTokenMessenger,
_destinationCaller,
_burnMessage
);
emit DepositForBurn(
_nonceReserved,
_burnToken,
_amount,
msg.sender,
_mintRecipient,
_destinationDomain,
_destinationTokenMessenger,
_destinationCaller
);
return _nonceReserved;
}
/**
* @notice Sends a BurnMessage through the local message transmitter
* @dev calls local message transmitter's sendMessage() function if `_destinationCaller` == bytes32(0),
* or else calls sendMessageWithCaller().
* @param _destinationDomain destination domain
* @param _destinationTokenMessenger address of registered TokenMessenger contract on destination domain, as bytes32
* @param _destinationCaller caller on the destination domain, as bytes32. If `_destinationCaller` == bytes32(0),
* any address can call receiveMessage() on destination domain.
* @param _burnMessage formatted BurnMessage bytes (message body)
* @return nonce unique nonce reserved by message
*/
function _sendDepositForBurnMessage(
uint32 _destinationDomain,
bytes32 _destinationTokenMessenger,
bytes32 _destinationCaller,
bytes memory _burnMessage
) internal returns (uint64 nonce) {
if (_destinationCaller == bytes32(0)) {
return
localMessageTransmitter.sendMessage(
_destinationDomain,
_destinationTokenMessenger,
_burnMessage
);
} else {
return
localMessageTransmitter.sendMessageWithCaller(
_destinationDomain,
_destinationTokenMessenger,
_destinationCaller,
_burnMessage
);
}
}
/**
* @notice Mints tokens to a recipient
* @param _tokenMinter address of TokenMinter contract
* @param _remoteDomain domain where burned tokens originate from
* @param _burnToken address of token burned
* @param _mintRecipient recipient address of minted tokens
* @param _amount amount of minted tokens
*/
function _mintAndWithdraw(
address _tokenMinter,
uint32 _remoteDomain,
bytes32 _burnToken,
address _mintRecipient,
uint256 _amount
) internal {
ITokenMinter _minter = ITokenMinter(_tokenMinter);
address _mintToken = _minter.mint(
_remoteDomain,
_burnToken,
_mintRecipient,
_amount
);
emit MintAndWithdraw(_mintRecipient, _amount, _mintToken);
}
/**
* @notice return the remote TokenMessenger for the given `_domain` if one exists, else revert.
* @param _domain The domain for which to get the remote TokenMessenger
* @return _tokenMessenger The address of the TokenMessenger on `_domain` as bytes32
*/
function _getRemoteTokenMessenger(uint32 _domain)
internal
view
returns (bytes32)
{
bytes32 _tokenMessenger = remoteTokenMessengers[_domain];
require(_tokenMessenger != bytes32(0), "No TokenMessenger for domain");
return _tokenMessenger;
}
/**
* @notice return the local minter address if it is set, else revert.
* @return local minter as ITokenMinter.
*/
function _getLocalMinter() internal view returns (ITokenMinter) {
require(address(localMinter) != address(0), "Local minter is not set");
return localMinter;
}
/**
* @notice Return true if the given remote domain and TokenMessenger is registered
* on this TokenMessenger.
* @param _domain The remote domain of the message.
* @param _tokenMessenger The address of the TokenMessenger on remote domain.
* @return true if a remote TokenMessenger is registered for `_domain` and `_tokenMessenger`,
* on this TokenMessenger.
*/
function _isRemoteTokenMessenger(uint32 _domain, bytes32 _tokenMessenger)
internal
view
returns (bool)
{
return
_tokenMessenger != bytes32(0) &&
remoteTokenMessengers[_domain] == _tokenMessenger;
}
/**
* @notice Returns true if the message sender is the local registered MessageTransmitter
* @return true if message sender is the registered local message transmitter
*/
function _isLocalMessageTransmitter() internal view returns (bool) {
return
address(localMessageTransmitter) != address(0) &&
msg.sender == address(localMessageTransmitter);
}
}
/**
* @title TokenMinter
* @notice Token Minter and Burner
* @dev Maintains registry of local mintable tokens and corresponding tokens on remote domains.
* This registry can be used by caller to determine which token on local domain to mint for a
* burned token on a remote domain, and vice versa.
* It is assumed that local and remote tokens are fungible at a constant 1:1 exchange rate.
*/
contract TokenMinter is ITokenMinter, TokenController, Pausable, Rescuable {
// ============ Events ============
/**
* @notice Emitted when a local TokenMessenger is added
* @param localTokenMessenger address of local TokenMessenger
* @notice Emitted when a local TokenMessenger is added
*/
event LocalTokenMessengerAdded(address localTokenMessenger);
/**
* @notice Emitted when a local TokenMessenger is removed
* @param localTokenMessenger address of local TokenMessenger
* @notice Emitted when a local TokenMessenger is removed
*/
event LocalTokenMessengerRemoved(address localTokenMessenger);
// ============ State Variables ============
// Local TokenMessenger with permission to call mint and burn on this TokenMinter
address public localTokenMessenger;
// ============ Modifiers ============
/**
* @notice Only accept messages from the registered message transmitter on local domain
*/
modifier onlyLocalTokenMessenger() {
require(_isLocalTokenMessenger(), "Caller not local TokenMessenger");
_;
}
// ============ Constructor ============
/**
* @param _tokenController Token controller address
*/
constructor(address _tokenController) {
_setTokenController(_tokenController);
}
// ============ External Functions ============
/**
* @notice Mints `amount` of local tokens corresponding to the
* given (`sourceDomain`, `burnToken`) pair, to `to` address.
* @dev reverts if the (`sourceDomain`, `burnToken`) pair does not
* map to a nonzero local token address. This mapping can be queried using
* getLocalToken().
* @param sourceDomain Source domain where `burnToken` was burned.
* @param burnToken Burned token address as bytes32.
* @param to Address to receive minted tokens, corresponding to `burnToken`,
* on this domain.
* @param amount Amount of tokens to mint. Must be less than or equal
* to the minterAllowance of this TokenMinter for given `_mintToken`.
* @return mintToken token minted.
*/
function mint(
uint32 sourceDomain,
bytes32 burnToken,
address to,
uint256 amount
)
external
override
whenNotPaused
onlyLocalTokenMessenger
returns (address mintToken)
{
address _mintToken = _getLocalToken(sourceDomain, burnToken);
require(_mintToken != address(0), "Mint token not supported");
IMintBurnToken _token = IMintBurnToken(_mintToken);
require(_token.mint(to, amount), "Mint operation failed");
return _mintToken;
}
/**
* @notice Burn tokens owned by this TokenMinter.
* @param burnToken burnable token address.
* @param burnAmount amount of tokens to burn. Must be
* > 0, and <= maximum burn amount per message.
*/
function burn(address burnToken, uint256 burnAmount)
external
override
whenNotPaused
onlyLocalTokenMessenger
onlyWithinBurnLimit(burnToken, burnAmount)
{
IMintBurnToken _token = IMintBurnToken(burnToken);
_token.burn(burnAmount);
}
/**
* @notice Add TokenMessenger for the local domain. Only this TokenMessenger
* has permission to call mint() and burn() on this TokenMinter.
* @dev Reverts if a TokenMessenger is already set for the local domain.
* @param newLocalTokenMessenger The address of the new TokenMessenger on the local domain.
*/
function addLocalTokenMessenger(address newLocalTokenMessenger)
external
onlyOwner
{
require(
newLocalTokenMessenger != address(0),
"Invalid TokenMessenger address"
);
require(
localTokenMessenger == address(0),
"Local TokenMessenger already set"
);
localTokenMessenger = newLocalTokenMessenger;
emit LocalTokenMessengerAdded(localTokenMessenger);
}
/**
* @notice Remove the TokenMessenger for the local domain.
* @dev Reverts if the TokenMessenger of the local domain is not set.
*/
function removeLocalTokenMessenger() external onlyOwner {
address _localTokenMessengerBeforeRemoval = localTokenMessenger;
require(
_localTokenMessengerBeforeRemoval != address(0),
"No local TokenMessenger is set"
);
delete localTokenMessenger;
emit LocalTokenMessengerRemoved(_localTokenMessengerBeforeRemoval);
}
/**
* @notice Set tokenController to `newTokenController`, and
* emit `SetTokenController` event.
* @dev newTokenController must be nonzero.
* @param newTokenController address of new token controller
*/
function setTokenController(address newTokenController)
external
override
onlyOwner
{
_setTokenController(newTokenController);
}
/**
* @notice Get the local token address associated with the given
* remote domain and token.
* @param remoteDomain Remote domain
* @param remoteToken Remote token
* @return local token address
*/
function getLocalToken(uint32 remoteDomain, bytes32 remoteToken)
external
view
override
returns (address)
{
return _getLocalToken(remoteDomain, remoteToken);
}
// ============ Internal Utils ============
/**
* @notice Returns true if the message sender is the registered local TokenMessenger
* @return True if the message sender is the registered local TokenMessenger
*/
function _isLocalTokenMessenger() internal view returns (bool) {
return
address(localTokenMessenger) != address(0) &&
msg.sender == address(localTokenMessenger);
}
}{
"compilationTarget": {
"TokenMinter.sol": "TokenMinter"
},
"evmVersion": "istanbul",
"libraries": {},
"metadata": {
"bytecodeHash": "ipfs"
},
"optimizer": {
"enabled": true,
"runs": 100000
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