// SPDX-License-Identifier: MIT
pragma solidity =0.8.25;
// lib/tanssi-bridge-relayer/snowbridge/contracts/src/interfaces/IERC20.sol
// SPDX-FileCopyrightText: 2023 Axelar Network
// SPDX-FileCopyrightText: 2023 Snowfork <hello@snowfork.com>
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
error InvalidAccount();
error InsufficientBalance(address sender, uint256 balance, uint256 needed);
error InsufficientAllowance(address spender, uint256 allowance, uint256 needed);
/**
* @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);
}
// lib/tanssi-bridge-relayer/snowbridge/contracts/src/interfaces/IERC20Permit.sol
// SPDX-FileCopyrightText: 2023 Axelar Network
// SPDX-FileCopyrightText: 2023 Snowfork <hello@snowfork.com>
interface IERC20Permit {
error PermitExpired();
error InvalidS();
error InvalidV();
error InvalidSignature();
function DOMAIN_SEPARATOR() external view returns (bytes32);
function nonces(address account) external view returns (uint256);
function permit(address issuer, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s)
external;
}
// lib/tanssi-bridge-relayer/snowbridge/contracts/src/TokenLib.sol
// SPDX-FileCopyrightText: 2023 Axelar Network
// SPDX-FileCopyrightText: 2023 Snowfork <hello@snowfork.com>
library TokenLib {
// keccak256('EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)')
bytes32 internal constant DOMAIN_TYPE_SIGNATURE_HASH =
bytes32(0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f);
// keccak256('Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)')
bytes32 internal constant PERMIT_SIGNATURE_HASH =
bytes32(0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9);
string internal constant EIP191_PREFIX_FOR_EIP712_STRUCTURED_DATA = "\x19\x01";
struct Token {
mapping(address account => uint256) balance;
mapping(address account => mapping(address spender => uint256)) allowance;
mapping(address token => uint256) nonces;
uint256 totalSupply;
}
/**
* @dev See {IERC20-transfer}.
*
* Requirements:
*
* - `recipient` cannot be the zero address.
* - the caller must have a balance of at least `amount`.
*/
function transfer(Token storage token, address sender, address recipient, uint256 amount) external returns (bool) {
_transfer(token, sender, recipient, amount);
return true;
}
/**
* @dev Creates `amount` tokens and assigns them to `account`, increasing
* the total supply.
*
* Emits a {Transfer} event with `from` set to the zero address.
*
* Requirements:
*
* - `to` cannot be the zero address.
*/
function mint(Token storage token, address account, uint256 amount) external {
if (account == address(0)) {
revert IERC20.InvalidAccount();
}
_update(token, address(0), account, amount);
}
/**
* @dev Destroys `amount` tokens from `account`, reducing the
* total supply.
*
* Emits a {Transfer} event with `to` set to the zero address.
*
* Requirements:
*
* - `account` cannot be the zero address.
* - `account` must have at least `amount` tokens.
*/
function burn(Token storage token, address account, uint256 amount) external {
if (account == address(0)) {
revert IERC20.InvalidAccount();
}
_update(token, account, address(0), amount);
}
/**
* @dev See {IERC20-approve}.
*
* NOTE: Prefer the {increaseAllowance} and {decreaseAllowance} methods, as
* they aren't vulnerable to the frontrunning attack described here:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
* See {IERC20-approve}.
*
* NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
* `transferFrom`. This is semantically equivalent to an infinite approval.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function approve(Token storage token, address owner, address spender, uint256 amount) external returns (bool) {
_approve(token, owner, spender, amount);
return true;
}
/**
* @dev See {IERC20-transferFrom}.
*
* Emits an {Approval} event indicating the updated allowance. This is not
* required by the EIP. See the note at the beginning of {ERC20}.
*
* Requirements:
*
* - `sender` and `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
* - the caller must have allowance for ``sender``'s tokens of at least
* `amount`.
*/
function transferFrom(Token storage token, address sender, address recipient, uint256 amount)
external
returns (bool)
{
uint256 _allowance = token.allowance[sender][msg.sender];
if (_allowance != type(uint256).max) {
if (_allowance < amount) {
revert IERC20.InsufficientAllowance(msg.sender, _allowance, amount);
}
unchecked {
_approve(token, sender, msg.sender, _allowance - amount);
}
}
_transfer(token, sender, recipient, amount);
return true;
}
/**
* @dev Atomically increases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function increaseAllowance(Token storage token, address spender, uint256 addedValue) external returns (bool) {
uint256 _allowance = token.allowance[msg.sender][spender];
if (_allowance != type(uint256).max) {
_approve(token, msg.sender, spender, _allowance + addedValue);
}
return true;
}
/**
* @dev Atomically decreases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
* - `spender` must have allowance for the caller of at least
* `subtractedValue`.
*/
function decreaseAllowance(Token storage token, address spender, uint256 subtractedValue) external returns (bool) {
uint256 _allowance = token.allowance[msg.sender][spender];
if (_allowance != type(uint256).max) {
if (_allowance < subtractedValue) {
revert IERC20.InsufficientAllowance(msg.sender, _allowance, subtractedValue);
}
unchecked {
_approve(token, msg.sender, spender, _allowance - subtractedValue);
}
}
return true;
}
function permit(
Token storage token,
bytes32 domainSeparator,
address issuer,
address spender,
uint256 value,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) external {
if (block.timestamp > deadline) revert IERC20Permit.PermitExpired();
if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
revert IERC20Permit.InvalidS();
}
if (v != 27 && v != 28) revert IERC20Permit.InvalidV();
bytes32 digest = keccak256(
abi.encodePacked(
EIP191_PREFIX_FOR_EIP712_STRUCTURED_DATA,
domainSeparator,
keccak256(abi.encode(PERMIT_SIGNATURE_HASH, issuer, spender, value, token.nonces[issuer]++, deadline))
)
);
address recoveredAddress = ecrecover(digest, v, r, s);
if (recoveredAddress != issuer) revert IERC20Permit.InvalidSignature();
// _approve will revert if issuer is address(0x0)
_approve(token, issuer, spender, value);
}
/**
* @dev Moves tokens `amount` from `sender` to `recipient`.
*
* This is internal function is equivalent to {transfer}, and can be used to
* e.g. implement automatic token fees, slashing mechanisms, etc.
*
* Emits a {Transfer} event.
*
* Requirements:
*
* - `sender` cannot be the zero address.
* - `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
*/
function _transfer(Token storage token, address sender, address recipient, uint256 amount) internal {
if (sender == address(0) || recipient == address(0)) {
revert IERC20.InvalidAccount();
}
_update(token, sender, recipient, amount);
}
/**
* @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
*
* This internal function is equivalent to `approve`, and can be used to
* e.g. set automatic allowances for certain subsystems, etc.
*
* Emits an {Approval} event.
*
* Requirements:
*
* - `owner` cannot be the zero address.
* - `spender` cannot be the zero address.
*/
function _approve(Token storage token, address owner, address spender, uint256 amount) internal {
if (owner == address(0) || spender == address(0)) {
revert IERC20.InvalidAccount();
}
token.allowance[owner][spender] = amount;
emit IERC20.Approval(owner, spender, amount);
}
/**
* @dev Transfers a `value` amount of tokens from `from` to `to`, or alternatively mints (or burns) if `from`
* (or `to`) is the zero address. All customizations to transfers, mints, and burns should be done by overriding
* this function.
*
* Emits a {Transfer} event.
*/
function _update(Token storage token, address from, address to, uint256 value) internal {
if (from == address(0)) {
// Overflow check required: The rest of the code assumes that totalSupply never overflows
token.totalSupply += value;
} else {
uint256 fromBalance = token.balance[from];
if (fromBalance < value) {
revert IERC20.InsufficientBalance(from, fromBalance, value);
}
unchecked {
// Overflow not possible: value <= fromBalance <= totalSupply.
token.balance[from] = fromBalance - value;
}
}
if (to == address(0)) {
unchecked {
// Overflow not possible: value <= totalSupply or value <= fromBalance <= totalSupply.
token.totalSupply -= value;
}
} else {
unchecked {
// Overflow not possible: balance + value is at most totalSupply, which we know fits into a uint256.
token.balance[to] += value;
}
}
emit IERC20.Transfer(from, to, value);
}
}
// lib/tanssi-bridge-relayer/snowbridge/contracts/src/Token.sol
// SPDX-FileCopyrightText: 2023 Axelar Network
// SPDX-FileCopyrightText: 2023 Snowfork <hello@snowfork.com>
/**
* @dev Implementation of the {IERC20} interface.
*
* This implementation is agnostic to the way tokens are created. This means
* that a supply mechanism has to be added in a derived contract using {_mint}.
* This supply mechanism has been added in {ERC20Permit-mint}.
*
* We have followed general OpenZeppelin guidelines: functions revert instead
* of returning `false` on failure. This behavior is conventional and does
* not conflict with the expectations of ERC20 applications.
*
* Additionally, an {Approval} event is emitted on calls to {transferFrom}.
* This allows applications to reconstruct the allowance for all accounts just
* by listening to these events. Other implementations of the EIP may not emit
* these events, as it isn't required by the specification.
*
* Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
* functions have been added to mitigate the well-known issues around setting
* allowances. See {IERC20-approve}.
*/
contract Token is IERC20, IERC20Permit {
using TokenLib for TokenLib.Token;
address public immutable GATEWAY;
bytes32 public immutable DOMAIN_SEPARATOR;
uint8 public immutable decimals;
string public name;
string public symbol;
TokenLib.Token token;
error Unauthorized();
/**
* @dev Sets the values for {name}, {symbol}, and {decimals}.
*/
constructor(string memory _name, string memory _symbol, uint8 _decimals) {
name = _name;
symbol = _symbol;
decimals = _decimals;
GATEWAY = msg.sender;
DOMAIN_SEPARATOR = keccak256(
abi.encode(
TokenLib.DOMAIN_TYPE_SIGNATURE_HASH,
keccak256(bytes(_name)),
keccak256(bytes("1")),
block.chainid,
address(this)
)
);
}
modifier onlyGateway() {
if (msg.sender != GATEWAY) {
revert Unauthorized();
}
_;
}
/**
* @dev Creates `amount` tokens and assigns them to `account`, increasing
* the total supply. Can only be called by the owner.
*
* Emits a {Transfer} event with `from` set to the zero address.
*
* Requirements:
*
* - `account` cannot be the zero address.
*/
function mint(address account, uint256 amount) external onlyGateway {
token.mint(account, amount);
}
/**
* @dev Destroys `amount` tokens from the account.
*/
function burn(address account, uint256 amount) external onlyGateway {
token.burn(account, amount);
}
/**
* @dev See {IERC20-transfer}.
*
* Requirements:
*
* - `recipient` cannot be the zero address.
* - the caller must have a balance of at least `amount`.
*/
function transfer(address recipient, uint256 amount) external returns (bool) {
return token.transfer(msg.sender, recipient, amount);
}
/**
* @dev See {IERC20-approve}.
*
* NOTE: Prefer the {increaseAllowance} and {decreaseAllowance} methods, as
* they aren't vulnerable to the frontrunning attack described here:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
* See {IERC20-approve}.
*
* NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
* `transferFrom`. This is semantically equivalent to an infinite approval.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function approve(address spender, uint256 amount) external returns (bool) {
return token.approve(msg.sender, spender, amount);
}
/**
* @dev See {IERC20-transferFrom}.
*
* Emits an {Approval} event indicating the updated allowance. This is not
* required by the EIP. See the note at the beginning of {ERC20}.
*
* Requirements:
*
* - `sender` and `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
* - the caller must have allowance for ``sender``'s tokens of at least
* `amount`.
*/
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool) {
return token.transferFrom(sender, recipient, amount);
}
/**
* @dev Atomically increases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function increaseAllowance(address spender, uint256 addedValue) external returns (bool) {
return token.increaseAllowance(spender, addedValue);
}
/**
* @dev Atomically decreases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
* - `spender` must have allowance for the caller of at least
* `subtractedValue`.
*/
function decreaseAllowance(address spender, uint256 subtractedValue) external returns (bool) {
return token.decreaseAllowance(spender, subtractedValue);
}
function permit(address issuer, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s)
external
{
token.permit(DOMAIN_SEPARATOR, issuer, spender, value, deadline, v, r, s);
}
function balanceOf(address account) external view returns (uint256) {
return token.balance[account];
}
function nonces(address account) external view returns (uint256) {
return token.nonces[account];
}
function totalSupply() external view returns (uint256) {
return token.totalSupply;
}
function allowance(address owner, address spender) external view returns (uint256) {
return token.allowance[owner][spender];
}
}
{
"compilationTarget": {
"Token.sol": "Token"
},
"evmVersion": "cancun",
"libraries": {},
"metadata": {
"bytecodeHash": "ipfs"
},
"optimizer": {
"enabled": true,
"runs": 800
},
"remappings": []
}
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