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Contract Name:
FiatTokenV2_2
Compiler Version
v0.6.12+commit.27d51765
Optimization Enabled:
Yes with 10000000 runs
Other Settings:
istanbul EvmVersion
Contract Source Code (Solidity Standard Json-Input format)
/**
* Copyright 2023 Circle Internet Financial, LTD. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* 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 0.6.12;
import { EIP712Domain } from "./EIP712Domain.sol"; // solhint-disable-line no-unused-import
import { Blacklistable } from "../v1/Blacklistable.sol"; // solhint-disable-line no-unused-import
import { FiatTokenV1 } from "../v1/FiatTokenV1.sol"; // solhint-disable-line no-unused-import
import { FiatTokenV2 } from "./FiatTokenV2.sol"; // solhint-disable-line no-unused-import
import { FiatTokenV2_1 } from "./FiatTokenV2_1.sol";
import { EIP712 } from "../util/EIP712.sol";
// solhint-disable func-name-mixedcase
/**
* @title FiatToken V2.2
* @notice ERC20 Token backed by fiat reserves, version 2.2
*/
contract FiatTokenV2_2 is FiatTokenV2_1 {
/**
* @notice Initialize v2.2
* @param accountsToBlacklist A list of accounts to migrate from the old blacklist
* @param newSymbol New token symbol
* data structure to the new blacklist data structure.
*/
function initializeV2_2(
address[] calldata accountsToBlacklist,
string calldata newSymbol
) external {
// solhint-disable-next-line reason-string
require(_initializedVersion == 2);
// Update fiat token symbol
symbol = newSymbol;
// Add previously blacklisted accounts to the new blacklist data structure
// and remove them from the old blacklist data structure.
for (uint256 i = 0; i < accountsToBlacklist.length; i++) {
require(
_deprecatedBlacklisted[accountsToBlacklist[i]],
"FiatTokenV2_2: Blacklisting previously unblacklisted account!"
);
_blacklist(accountsToBlacklist[i]);
delete _deprecatedBlacklisted[accountsToBlacklist[i]];
}
_blacklist(address(this));
delete _deprecatedBlacklisted[address(this)];
_initializedVersion = 3;
}
/**
* @dev Internal function to get the current chain id.
* @return The current chain id.
*/
function _chainId() internal virtual view returns (uint256) {
uint256 chainId;
assembly {
chainId := chainid()
}
return chainId;
}
/**
* @inheritdoc EIP712Domain
*/
function _domainSeparator() internal override view returns (bytes32) {
return EIP712.makeDomainSeparator(name, "2", _chainId());
}
/**
* @notice Update allowance with a signed permit
* @dev EOA wallet signatures should be packed in the order of r, s, v.
* @param owner Token owner's address (Authorizer)
* @param spender Spender's address
* @param value Amount of allowance
* @param deadline The time at which the signature expires (unix time), or max uint256 value to signal no expiration
* @param signature Signature bytes signed by an EOA wallet or a contract wallet
*/
function permit(
address owner,
address spender,
uint256 value,
uint256 deadline,
bytes memory signature
) external whenNotPaused {
_permit(owner, spender, value, deadline, signature);
}
/**
* @notice Execute a transfer with a signed authorization
* @dev EOA wallet signatures should be packed in the order of r, s, v.
* @param from Payer's address (Authorizer)
* @param to Payee's address
* @param value Amount to be transferred
* @param validAfter The time after which this is valid (unix time)
* @param validBefore The time before which this is valid (unix time)
* @param nonce Unique nonce
* @param signature Signature bytes signed by an EOA wallet or a contract wallet
*/
function transferWithAuthorization(
address from,
address to,
uint256 value,
uint256 validAfter,
uint256 validBefore,
bytes32 nonce,
bytes memory signature
) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {
_transferWithAuthorization(
from,
to,
value,
validAfter,
validBefore,
nonce,
signature
);
}
/**
* @notice Receive a transfer with a signed authorization from the payer
* @dev This has an additional check to ensure that the payee's address
* matches the caller of this function to prevent front-running attacks.
* EOA wallet signatures should be packed in the order of r, s, v.
* @param from Payer's address (Authorizer)
* @param to Payee's address
* @param value Amount to be transferred
* @param validAfter The time after which this is valid (unix time)
* @param validBefore The time before which this is valid (unix time)
* @param nonce Unique nonce
* @param signature Signature bytes signed by an EOA wallet or a contract wallet
*/
function receiveWithAuthorization(
address from,
address to,
uint256 value,
uint256 validAfter,
uint256 validBefore,
bytes32 nonce,
bytes memory signature
) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {
_receiveWithAuthorization(
from,
to,
value,
validAfter,
validBefore,
nonce,
signature
);
}
/**
* @notice Attempt to cancel an authorization
* @dev Works only if the authorization is not yet used.
* EOA wallet signatures should be packed in the order of r, s, v.
* @param authorizer Authorizer's address
* @param nonce Nonce of the authorization
* @param signature Signature bytes signed by an EOA wallet or a contract wallet
*/
function cancelAuthorization(
address authorizer,
bytes32 nonce,
bytes memory signature
) external whenNotPaused {
_cancelAuthorization(authorizer, nonce, signature);
}
/**
* @dev Helper method that sets the blacklist state of an account on balanceAndBlacklistStates.
* If _shouldBlacklist is true, we apply a (1 << 255) bitmask with an OR operation on the
* account's balanceAndBlacklistState. This flips the high bit for the account to 1,
* indicating that the account is blacklisted.
*
* If _shouldBlacklist if false, we reset the account's balanceAndBlacklistStates to their
* balances. This clears the high bit for the account, indicating that the account is unblacklisted.
* @param _account The address of the account.
* @param _shouldBlacklist True if the account should be blacklisted, false if the account should be unblacklisted.
*/
function _setBlacklistState(address _account, bool _shouldBlacklist)
internal
override
{
balanceAndBlacklistStates[_account] = _shouldBlacklist
? balanceAndBlacklistStates[_account] | (1 << 255)
: _balanceOf(_account);
}
/**
* @dev Helper method that sets the balance of an account on balanceAndBlacklistStates.
* Since balances are stored in the last 255 bits of the balanceAndBlacklistStates value,
* we need to ensure that the updated balance does not exceed (2^255 - 1).
* Since blacklisted accounts' balances cannot be updated, the method will also
* revert if the account is blacklisted
* @param _account The address of the account.
* @param _balance The new fiat token balance of the account (max: (2^255 - 1)).
*/
function _setBalance(address _account, uint256 _balance) internal override {
require(
_balance <= ((1 << 255) - 1),
"FiatTokenV2_2: Balance exceeds (2^255 - 1)"
);
require(
!_isBlacklisted(_account),
"FiatTokenV2_2: Account is blacklisted"
);
balanceAndBlacklistStates[_account] = _balance;
}
/**
* @inheritdoc Blacklistable
*/
function _isBlacklisted(address _account)
internal
override
view
returns (bool)
{
return balanceAndBlacklistStates[_account] >> 255 == 1;
}
/**
* @dev Helper method to obtain the balance of an account. Since balances
* are stored in the last 255 bits of the balanceAndBlacklistStates value,
* we apply a ((1 << 255) - 1) bit bitmask with an AND operation on the
* balanceAndBlacklistState to obtain the balance.
* @param _account The address of the account.
* @return The fiat token balance of the account.
*/
function _balanceOf(address _account)
internal
override
view
returns (uint256)
{
return balanceAndBlacklistStates[_account] & ((1 << 255) - 1);
}
/**
* @inheritdoc FiatTokenV1
*/
function approve(address spender, uint256 value)
external
override
whenNotPaused
returns (bool)
{
_approve(msg.sender, spender, value);
return true;
}
/**
* @inheritdoc FiatTokenV2
*/
function permit(
address owner,
address spender,
uint256 value,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) external override whenNotPaused {
_permit(owner, spender, value, deadline, v, r, s);
}
/**
* @inheritdoc FiatTokenV2
*/
function increaseAllowance(address spender, uint256 increment)
external
override
whenNotPaused
returns (bool)
{
_increaseAllowance(msg.sender, spender, increment);
return true;
}
/**
* @inheritdoc FiatTokenV2
*/
function decreaseAllowance(address spender, uint256 decrement)
external
override
whenNotPaused
returns (bool)
{
_decreaseAllowance(msg.sender, spender, decrement);
return true;
}
/**
* @notice Allows a minter to burn some of tokens from `from` account, deducting from
* the caller's allowance.
* @dev The caller must be a minter, must not be blacklisted, and the amount to burn
* should be less than or equal the caller's allowance.
* @param _amount the amount of tokens to be burned.
*/
function burnFrom(address from, uint256 _amount)
external
whenNotPaused
onlyMinters
//notBlacklisted(msg.sender) // skipped to fit into a contract size limit
notBlacklisted(from)
{
require(
_amount <= allowed[from][msg.sender],
"ERC20: burn amount exceeds allowance"
);
uint256 balance = _balanceOf(from);
require(_amount > 0, "FiatToken: burn amount not greater than 0");
require(balance >= _amount, "FiatToken: burn amount exceeds balance");
allowed[from][msg.sender] = allowed[from][msg.sender].sub(_amount);
totalSupply_ = totalSupply_.sub(_amount);
_setBalance(from, balance.sub(_amount));
emit Burn(from, _amount);
emit Transfer(from, address(0), _amount);
}
}/**
* Copyright 2023 Circle Internet Financial, LTD. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* 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 0.6.12;
// solhint-disable func-name-mixedcase
/**
* @title EIP712 Domain
*/
contract EIP712Domain {
// was originally DOMAIN_SEPARATOR
// but that has been moved to a method so we can override it in V2_2+
bytes32 internal _DEPRECATED_CACHED_DOMAIN_SEPARATOR;
/**
* @notice Get the EIP712 Domain Separator.
* @return The bytes32 EIP712 domain separator.
*/
function DOMAIN_SEPARATOR() external view returns (bytes32) {
return _domainSeparator();
}
/**
* @dev Internal method to get the EIP712 Domain Separator.
* @return The bytes32 EIP712 domain separator.
*/
function _domainSeparator() internal virtual view returns (bytes32) {
return _DEPRECATED_CACHED_DOMAIN_SEPARATOR;
}
}/**
* Copyright 2023 Circle Internet Financial, LTD. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* 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 0.6.12;
import { Ownable } from "./Ownable.sol";
/**
* @title Blacklistable Token
* @dev Allows accounts to be blacklisted by a "blacklister" role
*/
abstract contract Blacklistable is Ownable {
address public blacklister;
mapping(address => bool) internal _deprecatedBlacklisted;
event Blacklisted(address indexed _account);
event UnBlacklisted(address indexed _account);
event BlacklisterChanged(address indexed newBlacklister);
/**
* @dev Throws if called by any account other than the blacklister.
*/
modifier onlyBlacklister() {
require(
msg.sender == blacklister,
"Blacklistable: caller is not the blacklister"
);
_;
}
/**
* @dev Throws if argument account is blacklisted.
* @param _account The address to check.
*/
modifier notBlacklisted(address _account) {
require(
!_isBlacklisted(_account),
"Blacklistable: account is blacklisted"
);
_;
}
/**
* @notice Checks if account is blacklisted.
* @param _account The address to check.
* @return True if the account is blacklisted, false if the account is not blacklisted.
*/
function isBlacklisted(address _account) external view returns (bool) {
return _isBlacklisted(_account);
}
/**
* @notice Adds account to blacklist.
* @param _account The address to blacklist.
*/
function blacklist(address _account) external onlyBlacklister {
_blacklist(_account);
emit Blacklisted(_account);
}
/**
* @notice Removes account from blacklist.
* @param _account The address to remove from the blacklist.
*/
function unBlacklist(address _account) external onlyBlacklister {
_unBlacklist(_account);
emit UnBlacklisted(_account);
}
/**
* @notice Updates the blacklister address.
* @param _newBlacklister The address of the new blacklister.
*/
function updateBlacklister(address _newBlacklister) external onlyOwner {
require(
_newBlacklister != address(0),
"Blacklistable: new blacklister is the zero address"
);
blacklister = _newBlacklister;
emit BlacklisterChanged(blacklister);
}
/**
* @dev Checks if account is blacklisted.
* @param _account The address to check.
* @return true if the account is blacklisted, false otherwise.
*/
function _isBlacklisted(address _account)
internal
virtual
view
returns (bool);
/**
* @dev Helper method that blacklists an account.
* @param _account The address to blacklist.
*/
function _blacklist(address _account) internal virtual;
/**
* @dev Helper method that unblacklists an account.
* @param _account The address to unblacklist.
*/
function _unBlacklist(address _account) internal virtual;
}/**
* Copyright 2023 Circle Internet Financial, LTD. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* 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 0.6.12;
import { SafeMath } from "@openzeppelin/contracts/math/SafeMath.sol";
import { AbstractFiatTokenV1 } from "./AbstractFiatTokenV1.sol";
import { Ownable } from "./Ownable.sol";
import { Pausable } from "./Pausable.sol";
import { Blacklistable } from "./Blacklistable.sol";
/**
* @title FiatToken
* @dev ERC20 Token backed by fiat reserves
*/
contract FiatTokenV1 is AbstractFiatTokenV1, Ownable, Pausable, Blacklistable {
using SafeMath for uint256;
string public name;
string public symbol;
uint8 public decimals;
string public currency;
address public masterMinter;
bool internal initialized;
/// @dev A mapping that stores the balance and blacklist states for a given address.
/// The first bit defines whether the address is blacklisted (1 if blacklisted, 0 otherwise).
/// The last 255 bits define the balance for the address.
mapping(address => uint256) internal balanceAndBlacklistStates;
mapping(address => mapping(address => uint256)) internal allowed;
uint256 internal totalSupply_ = 0;
mapping(address => bool) internal minters;
mapping(address => uint256) internal minterAllowed;
event Mint(address indexed minter, address indexed to, uint256 amount);
event Burn(address indexed burner, uint256 amount);
event MinterConfigured(address indexed minter, uint256 minterAllowedAmount);
event MinterRemoved(address indexed oldMinter);
event MasterMinterChanged(address indexed newMasterMinter);
/**
* @notice Initializes the fiat token contract.
* @param tokenName The name of the fiat token.
* @param tokenSymbol The symbol of the fiat token.
* @param tokenCurrency The fiat currency that the token represents.
* @param tokenDecimals The number of decimals that the token uses.
* @param newMasterMinter The masterMinter address for the fiat token.
* @param newPauser The pauser address for the fiat token.
* @param newBlacklister The blacklister address for the fiat token.
* @param newOwner The owner of the fiat token.
*/
function initialize(
string memory tokenName,
string memory tokenSymbol,
string memory tokenCurrency,
uint8 tokenDecimals,
address newMasterMinter,
address newPauser,
address newBlacklister,
address newOwner
) public {
require(!initialized, "FiatToken: contract is already initialized");
require(
newMasterMinter != address(0),
"FiatToken: new masterMinter is the zero address"
);
require(
newPauser != address(0),
"FiatToken: new pauser is the zero address"
);
require(
newBlacklister != address(0),
"FiatToken: new blacklister is the zero address"
);
require(
newOwner != address(0),
"FiatToken: new owner is the zero address"
);
name = tokenName;
symbol = tokenSymbol;
currency = tokenCurrency;
decimals = tokenDecimals;
masterMinter = newMasterMinter;
pauser = newPauser;
blacklister = newBlacklister;
setOwner(newOwner);
initialized = true;
}
/**
* @dev Throws if called by any account other than a minter.
*/
modifier onlyMinters() {
require(minters[msg.sender], "FiatToken: caller is not a minter");
_;
}
/**
* @notice Mints fiat tokens to an address.
* @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 True if the operation was successful.
*/
function mint(address _to, uint256 _amount)
external
whenNotPaused
onlyMinters
notBlacklisted(msg.sender)
notBlacklisted(_to)
returns (bool)
{
require(_to != address(0), "FiatToken: mint to the zero address");
require(_amount > 0, "FiatToken: mint amount not greater than 0");
uint256 mintingAllowedAmount = minterAllowed[msg.sender];
require(
_amount <= mintingAllowedAmount,
"FiatToken: mint amount exceeds minterAllowance"
);
totalSupply_ = totalSupply_.add(_amount);
_setBalance(_to, _balanceOf(_to).add(_amount));
minterAllowed[msg.sender] = mintingAllowedAmount.sub(_amount);
emit Mint(msg.sender, _to, _amount);
emit Transfer(address(0), _to, _amount);
return true;
}
/**
* @dev Throws if called by any account other than the masterMinter
*/
modifier onlyMasterMinter() {
require(
msg.sender == masterMinter,
"FiatToken: caller is not the masterMinter"
);
_;
}
/**
* @notice Gets the minter allowance for an account.
* @param minter The address to check.
* @return The remaining minter allowance for the account.
*/
function minterAllowance(address minter) external view returns (uint256) {
return minterAllowed[minter];
}
/**
* @notice Checks if an account is a minter.
* @param account The address to check.
* @return True if the account is a minter, false if the account is not a minter.
*/
function isMinter(address account) external view returns (bool) {
return minters[account];
}
/**
* @notice Gets the remaining amount of fiat tokens a spender is allowed to transfer on
* behalf of the token owner.
* @param owner The token owner's address.
* @param spender The spender's address.
* @return The remaining allowance.
*/
function allowance(address owner, address spender)
external
override
view
returns (uint256)
{
return allowed[owner][spender];
}
/**
* @notice Gets the totalSupply of the fiat token.
* @return The totalSupply of the fiat token.
*/
function totalSupply() external override view returns (uint256) {
return totalSupply_;
}
/**
* @notice Gets the fiat token balance of an account.
* @param account The address to check.
* @return balance The fiat token balance of the account.
*/
function balanceOf(address account)
external
override
view
returns (uint256)
{
return _balanceOf(account);
}
/**
* @notice Sets a fiat token allowance for a spender to spend on behalf of the caller.
* @param spender The spender's address.
* @param value The allowance amount.
* @return True if the operation was successful.
*/
function approve(address spender, uint256 value)
external
virtual
override
whenNotPaused
notBlacklisted(msg.sender)
notBlacklisted(spender)
returns (bool)
{
_approve(msg.sender, spender, value);
return true;
}
/**
* @dev Internal function to set allowance.
* @param owner Token owner's address.
* @param spender Spender's address.
* @param value Allowance amount.
*/
function _approve(
address owner,
address spender,
uint256 value
) internal override {
require(owner != address(0), "ERC20: approve from the zero address");
require(spender != address(0), "ERC20: approve to the zero address");
allowed[owner][spender] = value;
emit Approval(owner, spender, value);
}
/**
* @notice Transfers tokens from an address to another by spending the caller's allowance.
* @dev The caller must have some fiat token allowance on the payer's tokens.
* @param from Payer's address.
* @param to Payee's address.
* @param value Transfer amount.
* @return True if the operation was successful.
*/
function transferFrom(
address from,
address to,
uint256 value
)
external
override
whenNotPaused
notBlacklisted(msg.sender)
notBlacklisted(from)
notBlacklisted(to)
returns (bool)
{
require(
value <= allowed[from][msg.sender],
"ERC20: transfer amount exceeds allowance"
);
_transfer(from, to, value);
allowed[from][msg.sender] = allowed[from][msg.sender].sub(value);
return true;
}
/**
* @notice Transfers tokens from the caller.
* @param to Payee's address.
* @param value Transfer amount.
* @return True if the operation was successful.
*/
function transfer(address to, uint256 value)
external
override
whenNotPaused
notBlacklisted(msg.sender)
notBlacklisted(to)
returns (bool)
{
_transfer(msg.sender, to, value);
return true;
}
/**
* @dev Internal function to process transfers.
* @param from Payer's address.
* @param to Payee's address.
* @param value Transfer amount.
*/
function _transfer(
address from,
address to,
uint256 value
) internal override {
require(from != address(0), "ERC20: transfer from the zero address");
require(to != address(0), "ERC20: transfer to the zero address");
require(
value <= _balanceOf(from),
"ERC20: transfer amount exceeds balance"
);
_setBalance(from, _balanceOf(from).sub(value));
_setBalance(to, _balanceOf(to).add(value));
emit Transfer(from, to, value);
}
/**
* @notice Adds or updates a new minter with a mint allowance.
* @param minter The address of the minter.
* @param minterAllowedAmount The minting amount allowed for the minter.
* @return True if the operation was successful.
*/
function configureMinter(address minter, uint256 minterAllowedAmount)
external
whenNotPaused
onlyMasterMinter
returns (bool)
{
minters[minter] = true;
minterAllowed[minter] = minterAllowedAmount;
emit MinterConfigured(minter, minterAllowedAmount);
return true;
}
/**
* @notice Removes a minter.
* @param minter The address of the minter to remove.
* @return True if the operation was successful.
*/
function removeMinter(address minter)
external
onlyMasterMinter
returns (bool)
{
minters[minter] = false;
minterAllowed[minter] = 0;
emit MinterRemoved(minter);
return true;
}
/**
* @notice Allows a minter to burn some of its own tokens.
* @dev The caller must be a minter, must not be blacklisted, and the amount to burn
* should be less than or equal to the account's balance.
* @param _amount the amount of tokens to be burned.
*/
function burn(uint256 _amount)
external
whenNotPaused
onlyMinters
notBlacklisted(msg.sender)
{
uint256 balance = _balanceOf(msg.sender);
require(_amount > 0, "FiatToken: burn amount not greater than 0");
require(balance >= _amount, "FiatToken: burn amount exceeds balance");
totalSupply_ = totalSupply_.sub(_amount);
_setBalance(msg.sender, balance.sub(_amount));
emit Burn(msg.sender, _amount);
emit Transfer(msg.sender, address(0), _amount);
}
/**
* @notice Updates the master minter address.
* @param _newMasterMinter The address of the new master minter.
*/
function updateMasterMinter(address _newMasterMinter) external onlyOwner {
require(
_newMasterMinter != address(0),
"FiatToken: new masterMinter is the zero address"
);
masterMinter = _newMasterMinter;
emit MasterMinterChanged(masterMinter);
}
/**
* @inheritdoc Blacklistable
*/
function _blacklist(address _account) internal override {
_setBlacklistState(_account, true);
}
/**
* @inheritdoc Blacklistable
*/
function _unBlacklist(address _account) internal override {
_setBlacklistState(_account, false);
}
/**
* @dev Helper method that sets the blacklist state of an account.
* @param _account The address of the account.
* @param _shouldBlacklist True if the account should be blacklisted, false if the account should be unblacklisted.
*/
function _setBlacklistState(address _account, bool _shouldBlacklist)
internal
virtual
{
_deprecatedBlacklisted[_account] = _shouldBlacklist;
}
/**
* @dev Helper method that sets the balance of an account.
* @param _account The address of the account.
* @param _balance The new fiat token balance of the account.
*/
function _setBalance(address _account, uint256 _balance) internal virtual {
balanceAndBlacklistStates[_account] = _balance;
}
/**
* @inheritdoc Blacklistable
*/
function _isBlacklisted(address _account)
internal
virtual
override
view
returns (bool)
{
return _deprecatedBlacklisted[_account];
}
/**
* @dev Helper method to obtain the balance of an account.
* @param _account The address of the account.
* @return The fiat token balance of the account.
*/
function _balanceOf(address _account)
internal
virtual
view
returns (uint256)
{
return balanceAndBlacklistStates[_account];
}
}/**
* Copyright 2023 Circle Internet Financial, LTD. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* 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 0.6.12;
import { FiatTokenV1_1 } from "../v1.1/FiatTokenV1_1.sol";
import { EIP712 } from "../util/EIP712.sol";
import { EIP3009 } from "./EIP3009.sol";
import { EIP2612 } from "./EIP2612.sol";
/**
* @title FiatToken V2
* @notice ERC20 Token backed by fiat reserves, version 2
*/
contract FiatTokenV2 is FiatTokenV1_1, EIP3009, EIP2612 {
uint8 internal _initializedVersion;
/**
* @notice Initialize v2
* @param newName New token name
*/
function initializeV2(string calldata newName) external {
// solhint-disable-next-line reason-string
require(initialized && _initializedVersion == 0);
name = newName;
_DEPRECATED_CACHED_DOMAIN_SEPARATOR = EIP712.makeDomainSeparator(
newName,
"2"
);
_initializedVersion = 1;
}
/**
* @notice Increase the allowance by a given increment
* @param spender Spender's address
* @param increment Amount of increase in allowance
* @return True if successful
*/
function increaseAllowance(address spender, uint256 increment)
external
virtual
whenNotPaused
notBlacklisted(msg.sender)
notBlacklisted(spender)
returns (bool)
{
_increaseAllowance(msg.sender, spender, increment);
return true;
}
/**
* @notice Decrease the allowance by a given decrement
* @param spender Spender's address
* @param decrement Amount of decrease in allowance
* @return True if successful
*/
function decreaseAllowance(address spender, uint256 decrement)
external
virtual
whenNotPaused
notBlacklisted(msg.sender)
notBlacklisted(spender)
returns (bool)
{
_decreaseAllowance(msg.sender, spender, decrement);
return true;
}
/**
* @notice Execute a transfer with a signed authorization
* @param from Payer's address (Authorizer)
* @param to Payee's address
* @param value Amount to be transferred
* @param validAfter The time after which this is valid (unix time)
* @param validBefore The time before which this is valid (unix time)
* @param nonce Unique nonce
* @param v v of the signature
* @param r r of the signature
* @param s s of the signature
*/
function transferWithAuthorization(
address from,
address to,
uint256 value,
uint256 validAfter,
uint256 validBefore,
bytes32 nonce,
uint8 v,
bytes32 r,
bytes32 s
) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {
_transferWithAuthorization(
from,
to,
value,
validAfter,
validBefore,
nonce,
v,
r,
s
);
}
/**
* @notice Receive a transfer with a signed authorization from the payer
* @dev This has an additional check to ensure that the payee's address
* matches the caller of this function to prevent front-running attacks.
* @param from Payer's address (Authorizer)
* @param to Payee's address
* @param value Amount to be transferred
* @param validAfter The time after which this is valid (unix time)
* @param validBefore The time before which this is valid (unix time)
* @param nonce Unique nonce
* @param v v of the signature
* @param r r of the signature
* @param s s of the signature
*/
function receiveWithAuthorization(
address from,
address to,
uint256 value,
uint256 validAfter,
uint256 validBefore,
bytes32 nonce,
uint8 v,
bytes32 r,
bytes32 s
) external whenNotPaused notBlacklisted(from) notBlacklisted(to) {
_receiveWithAuthorization(
from,
to,
value,
validAfter,
validBefore,
nonce,
v,
r,
s
);
}
/**
* @notice Attempt to cancel an authorization
* @dev Works only if the authorization is not yet used.
* @param authorizer Authorizer's address
* @param nonce Nonce of the authorization
* @param v v of the signature
* @param r r of the signature
* @param s s of the signature
*/
function cancelAuthorization(
address authorizer,
bytes32 nonce,
uint8 v,
bytes32 r,
bytes32 s
) external whenNotPaused {
_cancelAuthorization(authorizer, nonce, v, r, s);
}
/**
* @notice Update allowance with a signed permit
* @param owner Token owner's address (Authorizer)
* @param spender Spender's address
* @param value Amount of allowance
* @param deadline The time at which the signature expires (unix time), or max uint256 value to signal no expiration
* @param v v of the signature
* @param r r of the signature
* @param s s of the signature
*/
function permit(
address owner,
address spender,
uint256 value,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
)
external
virtual
whenNotPaused
notBlacklisted(owner)
notBlacklisted(spender)
{
_permit(owner, spender, value, deadline, v, r, s);
}
/**
* @dev Internal function to increase the allowance by a given increment
* @param owner Token owner's address
* @param spender Spender's address
* @param increment Amount of increase
*/
function _increaseAllowance(
address owner,
address spender,
uint256 increment
) internal override {
_approve(owner, spender, allowed[owner][spender].add(increment));
}
/**
* @dev Internal function to decrease the allowance by a given decrement
* @param owner Token owner's address
* @param spender Spender's address
* @param decrement Amount of decrease
*/
function _decreaseAllowance(
address owner,
address spender,
uint256 decrement
) internal override {
_approve(
owner,
spender,
allowed[owner][spender].sub(
decrement,
"ERC20: decreased allowance below zero"
)
);
}
}/**
* Copyright 2023 Circle Internet Financial, LTD. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* 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 0.6.12;
import { FiatTokenV2 } from "./FiatTokenV2.sol";
// solhint-disable func-name-mixedcase
/**
* @title FiatToken V2.1
* @notice ERC20 Token backed by fiat reserves, version 2.1
*/
contract FiatTokenV2_1 is FiatTokenV2 {
/**
* @notice Initialize v2.1
* @param lostAndFound The address to which the locked funds are sent
*/
function initializeV2_1(address lostAndFound) external {
// solhint-disable-next-line reason-string
require(_initializedVersion == 1);
uint256 lockedAmount = _balanceOf(address(this));
if (lockedAmount > 0) {
_transfer(address(this), lostAndFound, lockedAmount);
}
_blacklist(address(this));
_initializedVersion = 2;
}
/**
* @notice Version string for the EIP712 domain separator
* @return Version string
*/
function version() external pure returns (string memory) {
return "2";
}
}/**
* Copyright 2023 Circle Internet Financial, LTD. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* 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 0.6.12;
/**
* @title EIP712
* @notice A library that provides EIP712 helper functions
*/
library EIP712 {
/**
* @notice Make EIP712 domain separator
* @param name Contract name
* @param version Contract version
* @param chainId Blockchain ID
* @return Domain separator
*/
function makeDomainSeparator(
string memory name,
string memory version,
uint256 chainId
) internal view returns (bytes32) {
return
keccak256(
abi.encode(
// keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)")
0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f,
keccak256(bytes(name)),
keccak256(bytes(version)),
chainId,
address(this)
)
);
}
/**
* @notice Make EIP712 domain separator
* @param name Contract name
* @param version Contract version
* @return Domain separator
*/
function makeDomainSeparator(string memory name, string memory version)
internal
view
returns (bytes32)
{
uint256 chainId;
assembly {
chainId := chainid()
}
return makeDomainSeparator(name, version, chainId);
}
}/**
* SPDX-License-Identifier: MIT
*
* Copyright (c) 2018 zOS Global Limited.
* Copyright (c) 2018-2020 CENTRE SECZ
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
pragma solidity 0.6.12;
/**
* @notice The Ownable contract has an owner address, and provides basic
* authorization control functions
* @dev Forked from https://github.com/OpenZeppelin/openzeppelin-labs/blob/3887ab77b8adafba4a26ace002f3a684c1a3388b/upgradeability_ownership/contracts/ownership/Ownable.sol
* Modifications:
* 1. Consolidate OwnableStorage into this contract (7/13/18)
* 2. Reformat, conform to Solidity 0.6 syntax, and add error messages (5/13/20)
* 3. Make public functions external (5/27/20)
*/
contract Ownable {
// Owner of the contract
address private _owner;
/**
* @dev Event to show ownership has been transferred
* @param previousOwner representing the address of the previous owner
* @param newOwner representing the address of the new owner
*/
event OwnershipTransferred(address previousOwner, address newOwner);
/**
* @dev The constructor sets the original owner of the contract to the sender account.
*/
constructor() public {
setOwner(msg.sender);
}
/**
* @dev Tells the address of the owner
* @return the address of the owner
*/
function owner() external view returns (address) {
return _owner;
}
/**
* @dev Sets a new owner address
*/
function setOwner(address newOwner) internal {
_owner = newOwner;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(msg.sender == _owner, "Ownable: caller is not the owner");
_;
}
/**
* @dev Allows the current owner to transfer control of the contract to a newOwner.
* @param newOwner The address to transfer ownership to.
*/
function transferOwnership(address newOwner) external onlyOwner {
require(
newOwner != address(0),
"Ownable: new owner is the zero address"
);
emit OwnershipTransferred(_owner, newOwner);
setOwner(newOwner);
}
}// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/**
* @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;
}
}/**
* Copyright 2023 Circle Internet Financial, LTD. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* 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 0.6.12;
import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
abstract contract AbstractFiatTokenV1 is IERC20 {
function _approve(
address owner,
address spender,
uint256 value
) internal virtual;
function _transfer(
address from,
address to,
uint256 value
) internal virtual;
}/**
* SPDX-License-Identifier: MIT
*
* Copyright (c) 2016 Smart Contract Solutions, Inc.
* Copyright (c) 2018-2020 CENTRE SECZ
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
pragma solidity 0.6.12;
import { Ownable } from "./Ownable.sol";
/**
* @notice Base contract which allows children to implement an emergency stop
* mechanism
* @dev Forked from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/feb665136c0dae9912e08397c1a21c4af3651ef3/contracts/lifecycle/Pausable.sol
* Modifications:
* 1. Added pauser role, switched pause/unpause to be onlyPauser (6/14/2018)
* 2. Removed whenNotPause/whenPaused from pause/unpause (6/14/2018)
* 3. Removed whenPaused (6/14/2018)
* 4. Switches ownable library to use ZeppelinOS (7/12/18)
* 5. Remove constructor (7/13/18)
* 6. Reformat, conform to Solidity 0.6 syntax and add error messages (5/13/20)
* 7. Make public functions external (5/27/20)
*/
contract Pausable is Ownable {
event Pause();
event Unpause();
event PauserChanged(address indexed newAddress);
address public 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");
_;
}
/**
* @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();
}
/**
* @notice Updates the pauser address.
* @param _newPauser The address of the new pauser.
*/
function updatePauser(address _newPauser) external onlyOwner {
require(
_newPauser != address(0),
"Pausable: new pauser is the zero address"
);
pauser = _newPauser;
emit PauserChanged(pauser);
}
}/**
* Copyright 2023 Circle Internet Financial, LTD. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* 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 0.6.12;
import { FiatTokenV1 } from "../v1/FiatTokenV1.sol";
import { Rescuable } from "./Rescuable.sol";
/**
* @title FiatTokenV1_1
* @dev ERC20 Token backed by fiat reserves
*/
contract FiatTokenV1_1 is FiatTokenV1, Rescuable {
}/**
* Copyright 2023 Circle Internet Financial, LTD. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* 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 0.6.12;
import { AbstractFiatTokenV2 } from "./AbstractFiatTokenV2.sol";
import { EIP712Domain } from "./EIP712Domain.sol";
import { SignatureChecker } from "../util/SignatureChecker.sol";
import { MessageHashUtils } from "../util/MessageHashUtils.sol";
/**
* @title EIP-3009
* @notice Provide internal implementation for gas-abstracted transfers
* @dev Contracts that inherit from this must wrap these with publicly
* accessible functions, optionally adding modifiers where necessary
*/
abstract contract EIP3009 is AbstractFiatTokenV2, EIP712Domain {
// keccak256("TransferWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)")
bytes32
public constant TRANSFER_WITH_AUTHORIZATION_TYPEHASH = 0x7c7c6cdb67a18743f49ec6fa9b35f50d52ed05cbed4cc592e13b44501c1a2267;
// keccak256("ReceiveWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)")
bytes32
public constant RECEIVE_WITH_AUTHORIZATION_TYPEHASH = 0xd099cc98ef71107a616c4f0f941f04c322d8e254fe26b3c6668db87aae413de8;
// keccak256("CancelAuthorization(address authorizer,bytes32 nonce)")
bytes32
public constant CANCEL_AUTHORIZATION_TYPEHASH = 0x158b0a9edf7a828aad02f63cd515c68ef2f50ba807396f6d12842833a1597429;
/**
* @dev authorizer address => nonce => bool (true if nonce is used)
*/
mapping(address => mapping(bytes32 => bool)) private _authorizationStates;
event AuthorizationUsed(address indexed authorizer, bytes32 indexed nonce);
event AuthorizationCanceled(
address indexed authorizer,
bytes32 indexed nonce
);
/**
* @notice Returns the state of an authorization
* @dev Nonces are randomly generated 32-byte data unique to the
* authorizer's address
* @param authorizer Authorizer's address
* @param nonce Nonce of the authorization
* @return True if the nonce is used
*/
function authorizationState(address authorizer, bytes32 nonce)
external
view
returns (bool)
{
return _authorizationStates[authorizer][nonce];
}
/**
* @notice Execute a transfer with a signed authorization
* @param from Payer's address (Authorizer)
* @param to Payee's address
* @param value Amount to be transferred
* @param validAfter The time after which this is valid (unix time)
* @param validBefore The time before which this is valid (unix time)
* @param nonce Unique nonce
* @param v v of the signature
* @param r r of the signature
* @param s s of the signature
*/
function _transferWithAuthorization(
address from,
address to,
uint256 value,
uint256 validAfter,
uint256 validBefore,
bytes32 nonce,
uint8 v,
bytes32 r,
bytes32 s
) internal {
_transferWithAuthorization(
from,
to,
value,
validAfter,
validBefore,
nonce,
abi.encodePacked(r, s, v)
);
}
/**
* @notice Execute a transfer with a signed authorization
* @dev EOA wallet signatures should be packed in the order of r, s, v.
* @param from Payer's address (Authorizer)
* @param to Payee's address
* @param value Amount to be transferred
* @param validAfter The time after which this is valid (unix time)
* @param validBefore The time before which this is valid (unix time)
* @param nonce Unique nonce
* @param signature Signature byte array produced by an EOA wallet or a contract wallet
*/
function _transferWithAuthorization(
address from,
address to,
uint256 value,
uint256 validAfter,
uint256 validBefore,
bytes32 nonce,
bytes memory signature
) internal {
_requireValidAuthorization(from, nonce, validAfter, validBefore);
_requireValidSignature(
from,
keccak256(
abi.encode(
TRANSFER_WITH_AUTHORIZATION_TYPEHASH,
from,
to,
value,
validAfter,
validBefore,
nonce
)
),
signature
);
_markAuthorizationAsUsed(from, nonce);
_transfer(from, to, value);
}
/**
* @notice Receive a transfer with a signed authorization from the payer
* @dev This has an additional check to ensure that the payee's address
* matches the caller of this function to prevent front-running attacks.
* @param from Payer's address (Authorizer)
* @param to Payee's address
* @param value Amount to be transferred
* @param validAfter The time after which this is valid (unix time)
* @param validBefore The time before which this is valid (unix time)
* @param nonce Unique nonce
* @param v v of the signature
* @param r r of the signature
* @param s s of the signature
*/
function _receiveWithAuthorization(
address from,
address to,
uint256 value,
uint256 validAfter,
uint256 validBefore,
bytes32 nonce,
uint8 v,
bytes32 r,
bytes32 s
) internal {
_receiveWithAuthorization(
from,
to,
value,
validAfter,
validBefore,
nonce,
abi.encodePacked(r, s, v)
);
}
/**
* @notice Receive a transfer with a signed authorization from the payer
* @dev This has an additional check to ensure that the payee's address
* matches the caller of this function to prevent front-running attacks.
* EOA wallet signatures should be packed in the order of r, s, v.
* @param from Payer's address (Authorizer)
* @param to Payee's address
* @param value Amount to be transferred
* @param validAfter The time after which this is valid (unix time)
* @param validBefore The time before which this is valid (unix time)
* @param nonce Unique nonce
* @param signature Signature byte array produced by an EOA wallet or a contract wallet
*/
function _receiveWithAuthorization(
address from,
address to,
uint256 value,
uint256 validAfter,
uint256 validBefore,
bytes32 nonce,
bytes memory signature
) internal {
require(to == msg.sender, "FiatTokenV2: caller must be the payee");
_requireValidAuthorization(from, nonce, validAfter, validBefore);
_requireValidSignature(
from,
keccak256(
abi.encode(
RECEIVE_WITH_AUTHORIZATION_TYPEHASH,
from,
to,
value,
validAfter,
validBefore,
nonce
)
),
signature
);
_markAuthorizationAsUsed(from, nonce);
_transfer(from, to, value);
}
/**
* @notice Attempt to cancel an authorization
* @param authorizer Authorizer's address
* @param nonce Nonce of the authorization
* @param v v of the signature
* @param r r of the signature
* @param s s of the signature
*/
function _cancelAuthorization(
address authorizer,
bytes32 nonce,
uint8 v,
bytes32 r,
bytes32 s
) internal {
_cancelAuthorization(authorizer, nonce, abi.encodePacked(r, s, v));
}
/**
* @notice Attempt to cancel an authorization
* @dev EOA wallet signatures should be packed in the order of r, s, v.
* @param authorizer Authorizer's address
* @param nonce Nonce of the authorization
* @param signature Signature byte array produced by an EOA wallet or a contract wallet
*/
function _cancelAuthorization(
address authorizer,
bytes32 nonce,
bytes memory signature
) internal {
_requireUnusedAuthorization(authorizer, nonce);
_requireValidSignature(
authorizer,
keccak256(
abi.encode(CANCEL_AUTHORIZATION_TYPEHASH, authorizer, nonce)
),
signature
);
_authorizationStates[authorizer][nonce] = true;
emit AuthorizationCanceled(authorizer, nonce);
}
/**
* @notice Validates that signature against input data struct
* @param signer Signer's address
* @param dataHash Hash of encoded data struct
* @param signature Signature byte array produced by an EOA wallet or a contract wallet
*/
function _requireValidSignature(
address signer,
bytes32 dataHash,
bytes memory signature
) private view {
require(
SignatureChecker.isValidSignatureNow(
signer,
MessageHashUtils.toTypedDataHash(_domainSeparator(), dataHash),
signature
),
"FiatTokenV2: invalid signature"
);
}
/**
* @notice Check that an authorization is unused
* @param authorizer Authorizer's address
* @param nonce Nonce of the authorization
*/
function _requireUnusedAuthorization(address authorizer, bytes32 nonce)
private
view
{
require(
!_authorizationStates[authorizer][nonce],
"FiatTokenV2: authorization is used or canceled"
);
}
/**
* @notice Check that authorization is valid
* @param authorizer Authorizer's address
* @param nonce Nonce of the authorization
* @param validAfter The time after which this is valid (unix time)
* @param validBefore The time before which this is valid (unix time)
*/
function _requireValidAuthorization(
address authorizer,
bytes32 nonce,
uint256 validAfter,
uint256 validBefore
) private view {
require(
now > validAfter,
"FiatTokenV2: authorization is not yet valid"
);
require(now < validBefore, "FiatTokenV2: authorization is expired");
_requireUnusedAuthorization(authorizer, nonce);
}
/**
* @notice Mark an authorization as used
* @param authorizer Authorizer's address
* @param nonce Nonce of the authorization
*/
function _markAuthorizationAsUsed(address authorizer, bytes32 nonce)
private
{
_authorizationStates[authorizer][nonce] = true;
emit AuthorizationUsed(authorizer, nonce);
}
}/**
* Copyright 2023 Circle Internet Financial, LTD. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* 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 0.6.12;
import { AbstractFiatTokenV2 } from "./AbstractFiatTokenV2.sol";
import { EIP712Domain } from "./EIP712Domain.sol";
import { MessageHashUtils } from "../util/MessageHashUtils.sol";
import { SignatureChecker } from "../util/SignatureChecker.sol";
/**
* @title EIP-2612
* @notice Provide internal implementation for gas-abstracted approvals
*/
abstract contract EIP2612 is AbstractFiatTokenV2, EIP712Domain {
// keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)")
bytes32
public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
mapping(address => uint256) private _permitNonces;
/**
* @notice Nonces for permit
* @param owner Token owner's address (Authorizer)
* @return Next nonce
*/
function nonces(address owner) external view returns (uint256) {
return _permitNonces[owner];
}
/**
* @notice Verify a signed approval permit and execute if valid
* @param owner Token owner's address (Authorizer)
* @param spender Spender's address
* @param value Amount of allowance
* @param deadline The time at which the signature expires (unix time), or max uint256 value to signal no expiration
* @param v v of the signature
* @param r r of the signature
* @param s s of the signature
*/
function _permit(
address owner,
address spender,
uint256 value,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) internal {
_permit(owner, spender, value, deadline, abi.encodePacked(r, s, v));
}
/**
* @notice Verify a signed approval permit and execute if valid
* @dev EOA wallet signatures should be packed in the order of r, s, v.
* @param owner Token owner's address (Authorizer)
* @param spender Spender's address
* @param value Amount of allowance
* @param deadline The time at which the signature expires (unix time), or max uint256 value to signal no expiration
* @param signature Signature byte array signed by an EOA wallet or a contract wallet
*/
function _permit(
address owner,
address spender,
uint256 value,
uint256 deadline,
bytes memory signature
) internal {
require(
deadline == type(uint256).max || deadline >= now,
"FiatTokenV2: permit is expired"
);
bytes32 typedDataHash = MessageHashUtils.toTypedDataHash(
_domainSeparator(),
keccak256(
abi.encode(
PERMIT_TYPEHASH,
owner,
spender,
value,
_permitNonces[owner]++,
deadline
)
)
);
require(
SignatureChecker.isValidSignatureNow(
owner,
typedDataHash,
signature
),
"EIP2612: invalid signature"
);
_approve(owner, spender, value);
}
}// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves `amount` tokens from the caller's account to `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);
}/**
* Copyright 2023 Circle Internet Financial, LTD. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* 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 0.6.12;
import { Ownable } from "../v1/Ownable.sol";
import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import { SafeERC20 } from "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
contract Rescuable is Ownable {
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 Updates the rescuer address.
* @param newRescuer The address of the new rescuer.
*/
function updateRescuer(address newRescuer) external onlyOwner {
require(
newRescuer != address(0),
"Rescuable: new rescuer is the zero address"
);
_rescuer = newRescuer;
emit RescuerChanged(newRescuer);
}
}/**
* Copyright 2023 Circle Internet Financial, LTD. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* 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 0.6.12;
import { AbstractFiatTokenV1 } from "../v1/AbstractFiatTokenV1.sol";
abstract contract AbstractFiatTokenV2 is AbstractFiatTokenV1 {
function _increaseAllowance(
address owner,
address spender,
uint256 increment
) internal virtual;
function _decreaseAllowance(
address owner,
address spender,
uint256 decrement
) internal virtual;
}/**
* Copyright 2023 Circle Internet Financial, LTD. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* 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 0.6.12;
import { ECRecover } from "./ECRecover.sol";
import { IERC1271 } from "../interface/IERC1271.sol";
/**
* @dev Signature verification helper that can be used instead of `ECRecover.recover` to seamlessly support both ECDSA
* signatures from externally owned accounts (EOAs) as well as ERC1271 signatures from smart contract wallets.
*
* Adapted from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/21bb89ef5bfc789b9333eb05e3ba2b7b284ac77c/contracts/utils/cryptography/SignatureChecker.sol
*/
library SignatureChecker {
/**
* @dev Checks if a signature is valid for a given signer and data hash. If the signer is a smart contract, the
* signature is validated against that smart contract using ERC1271, otherwise it's validated using `ECRecover.recover`.
* @param signer Address of the claimed signer
* @param digest Keccak-256 hash digest of the signed message
* @param signature Signature byte array associated with hash
*/
function isValidSignatureNow(
address signer,
bytes32 digest,
bytes memory signature
) external view returns (bool) {
if (!isContract(signer)) {
return ECRecover.recover(digest, signature) == signer;
}
return isValidERC1271SignatureNow(signer, digest, signature);
}
/**
* @dev Checks if a signature is valid for a given signer and data hash. The signature is validated
* against the signer smart contract using ERC1271.
* @param signer Address of the claimed signer
* @param digest Keccak-256 hash digest of the signed message
* @param signature Signature byte array associated with hash
*
* NOTE: Unlike ECDSA signatures, contract signatures are revocable, and the outcome of this function can thus
* change through time. It could return true at block N and false at block N+1 (or the opposite).
*/
function isValidERC1271SignatureNow(
address signer,
bytes32 digest,
bytes memory signature
) internal view returns (bool) {
(bool success, bytes memory result) = signer.staticcall(
abi.encodeWithSelector(
IERC1271.isValidSignature.selector,
digest,
signature
)
);
return (success &&
result.length >= 32 &&
abi.decode(result, (bytes32)) ==
bytes32(IERC1271.isValidSignature.selector));
}
/**
* @dev Checks if the input address is a smart contract.
*/
function isContract(address addr) internal view returns (bool) {
uint256 size;
assembly {
size := extcodesize(addr)
}
return size > 0;
}
}/**
* Copyright 2023 Circle Internet Financial, LTD. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* 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 0.6.12;
/**
* @dev Signature message hash utilities for producing digests to be consumed by {ECDSA} recovery or signing.
*
* The library provides methods for generating a hash of a message that conforms to the
* https://eips.ethereum.org/EIPS/eip-191[EIP 191] and https://eips.ethereum.org/EIPS/eip-712[EIP 712]
* specifications.
*/
library MessageHashUtils {
/**
* @dev Returns the keccak256 digest of an EIP-712 typed data (EIP-191 version `0x01`).
* Adapted from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/21bb89ef5bfc789b9333eb05e3ba2b7b284ac77c/contracts/utils/cryptography/MessageHashUtils.sol
*
* The digest is calculated from a `domainSeparator` and a `structHash`, by prefixing them with
* `\x19\x01` and hashing the result. It corresponds to the hash signed by the
* https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`] JSON-RPC method as part of EIP-712.
*
* @param domainSeparator Domain separator
* @param structHash Hashed EIP-712 data struct
* @return digest The keccak256 digest of an EIP-712 typed data
*/
function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash)
internal
pure
returns (bytes32 digest)
{
assembly {
let ptr := mload(0x40)
mstore(ptr, "\x19\x01")
mstore(add(ptr, 0x02), domainSeparator)
mstore(add(ptr, 0x22), structHash)
digest := keccak256(ptr, 0x42)
}
}
}// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
import "./IERC20.sol";
import "../../math/SafeMath.sol";
import "../../utils/Address.sol";
/**
* @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");
}
}
}/**
* Copyright 2023 Circle Internet Financial, LTD. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* 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 0.6.12;
/**
* @title ECRecover
* @notice A library that provides a safe ECDSA recovery function
*/
library ECRecover {
/**
* @notice Recover signer's address from a signed message
* @dev Adapted from: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/65e4ffde586ec89af3b7e9140bdc9235d1254853/contracts/cryptography/ECDSA.sol
* Modifications: Accept v, r, and s as separate arguments
* @param digest Keccak-256 hash digest of the signed message
* @param v v of the signature
* @param r r of the signature
* @param s s of the signature
* @return Signer address
*/
function recover(
bytes32 digest,
uint8 v,
bytes32 r,
bytes32 s
) internal pure returns (address) {
// EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
// unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
// the valid range for s in (281): 0 < s < secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most
// signatures from current libraries generate a unique signature with an s-value in the lower half order.
//
// If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
// with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
// vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
// these malleable signatures as well.
if (
uint256(s) >
0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0
) {
revert("ECRecover: invalid signature 's' value");
}
if (v != 27 && v != 28) {
revert("ECRecover: invalid signature 'v' value");
}
// If the signature is valid (and not malleable), return the signer address
address signer = ecrecover(digest, v, r, s);
require(signer != address(0), "ECRecover: invalid signature");
return signer;
}
/**
* @notice Recover signer's address from a signed message
* @dev Adapted from: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/0053ee040a7ff1dbc39691c9e67a69f564930a88/contracts/utils/cryptography/ECDSA.sol
* @param digest Keccak-256 hash digest of the signed message
* @param signature Signature byte array associated with hash
* @return Signer address
*/
function recover(bytes32 digest, bytes memory signature)
internal
pure
returns (address)
{
require(signature.length == 65, "ECRecover: invalid signature length");
bytes32 r;
bytes32 s;
uint8 v;
// ecrecover takes the signature parameters, and the only way to get them
// currently is to use assembly.
/// @solidity memory-safe-assembly
assembly {
r := mload(add(signature, 0x20))
s := mload(add(signature, 0x40))
v := byte(0, mload(add(signature, 0x60)))
}
return recover(digest, v, r, s);
}
}/**
* Copyright 2023 Circle Internet Financial, LTD. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* 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 0.6.12;
/**
* @dev Interface of the ERC1271 standard signature validation method for
* contracts as defined in https://eips.ethereum.org/EIPS/eip-1271[ERC-1271].
*/
interface IERC1271 {
/**
* @dev Should return whether the signature provided is valid for the provided data
* @param hash Hash of the data to be signed
* @param signature Signature byte array associated with the provided data hash
* @return magicValue bytes4 magic value 0x1626ba7e when function passes
*/
function isValidSignature(bytes32 hash, bytes memory signature)
external
view
returns (bytes4 magicValue);
}// SPDX-License-Identifier: MIT
pragma solidity >=0.6.2 <0.8.0;
/**
* @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);
}
}
}
}{
"remappings": [
"forge-std/=lib/forge-std/src/",
"@openzeppelin/=node_modules/@openzeppelin/",
"@ensdomains/=node_modules/@ensdomains/",
"@solidity-parser/=node_modules/prettier-plugin-solidity/node_modules/@solidity-parser/",
"ds-test/=lib/forge-std/lib/ds-test/src/",
"eth-gas-reporter/=node_modules/eth-gas-reporter/",
"hardhat/=node_modules/hardhat/"
],
"optimizer": {
"enabled": true,
"runs": 10000000
},
"metadata": {
"useLiteralContent": false,
"bytecodeHash": "ipfs"
},
"outputSelection": {
"*": {
"*": [
"evm.bytecode",
"evm.deployedBytecode",
"devdoc",
"userdoc",
"metadata",
"abi"
]
}
},
"evmVersion": "istanbul",
"libraries": {
"contracts/util/SignatureChecker.sol": {
"SignatureChecker": "0xB4A197eFc9F11B460E11eA7A819EeB2c902DD7Cf"
}
}
}Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
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IERC20","name":"tokenContract","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"rescueERC20","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"rescuer","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"uint256","name":"validAfter","type":"uint256"},{"internalType":"uint256","name":"validBefore","type":"uint256"},{"internalType":"bytes32","name":"nonce","type":"bytes32"},{"internalType":"bytes","name":"signature","type":"bytes"}],"name":"transferWithAuthorization","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"uint256","name":"validAfter","type":"uint256"},{"internalType":"uint256","name":"validBefore","type":"uint256"},{"internalType":"bytes32","name":"nonce","type":"bytes32"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"transferWithAuthorization","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_account","type":"address"}],"name":"unBlacklist","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"unpause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_newBlacklister","type":"address"}],"name":"updateBlacklister","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_newMasterMinter","type":"address"}],"name":"updateMasterMinter","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_newPauser","type":"address"}],"name":"updatePauser","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newRescuer","type":"address"}],"name":"updateRescuer","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"version","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"pure","type":"function"}]Contract Creation Code
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Multichain Portfolio | 30 Chains
| Chain | Token | Portfolio % | Price | Amount | Value |
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.