Curve Token V5

name: public(String[64])

@external
def initialize(_name: String[64], _symbol: String[32], _pool: address):
    assert self.minter == ZERO_ADDRESS  # dev: check that we call it from factory

    self.name = _name
    self.symbol = _symbol
    self.minter = _pool

    self.DOMAIN_SEPARATOR = keccak256(
        _abi_encode(EIP712_TYPEHASH, keccak256(_name), keccak256(VERSION), chain.id, self)
    )

    # fire a transfer event so block explorers identify the contract as an ERC20
    log Transfer(ZERO_ADDRESS, msg.sender, 0)

symbol: public(String[32])

@external
def initialize(_name: String[64], _symbol: String[32], _pool: address):
    assert self.minter == ZERO_ADDRESS  # dev: check that we call it from factory

    self.name = _name
    self.symbol = _symbol
    self.minter = _pool

    self.DOMAIN_SEPARATOR = keccak256(
        _abi_encode(EIP712_TYPEHASH, keccak256(_name), keccak256(VERSION), chain.id, self)
    )

    # fire a transfer event so block explorers identify the contract as an ERC20
    log Transfer(ZERO_ADDRESS, msg.sender, 0)

@view
@external
def decimals() -> uint8:
    """
    @notice Get the number of decimals for this token
    @dev Implemented as a view method to reduce gas costs
    @return uint8 decimal places
    """
    return 18

VERSION: constant(String[8]) = "v5.0.0"

@view
@external
def version() -> String[8]:
    """
    @notice Get the version of this token contract
    """
    return VERSION

balanceOf: public(HashMap[address, uint256])

totalSupply: public(uint256)

minter: public(address)

@external
def __init__():
    self.minter = 0x0000000000000000000000000000000000000001

@external
def initialize(_name: String[64], _symbol: String[32], _pool: address):
    assert self.minter == ZERO_ADDRESS  # dev: check that we call it from factory

    self.name = _name
    self.symbol = _symbol
    self.minter = _pool

    self.DOMAIN_SEPARATOR = keccak256(
        _abi_encode(EIP712_TYPEHASH, keccak256(_name), keccak256(VERSION), chain.id, self)
    )

    # fire a transfer event so block explorers identify the contract as an ERC20
    log Transfer(ZERO_ADDRESS, msg.sender, 0)

event Transfer:
    _from: indexed(address)
    _to: indexed(address)
    _value: uint256

@external
def transfer(_to: address, _value: uint256) -> bool:
    """
    @dev Transfer token for a specified address
    @param _to The address to transfer to.
    @param _value The amount to be transferred.
    """
    # NOTE: vyper does not allow underflows
    #       so the following subtraction would revert on insufficient balance
    self.balanceOf[msg.sender] -= _value
    self.balanceOf[_to] += _value

    log Transfer(msg.sender, _to, _value)
    return True

event Transfer:
    _from: indexed(address)
    _to: indexed(address)
    _value: uint256

@external
def transferFrom(_from: address, _to: address, _value: uint256) -> bool:
    """
    @dev Transfer tokens from one address to another.
    @param _from address The address which you want to send tokens from
    @param _to address The address which you want to transfer to
    @param _value uint256 the amount of tokens to be transferred
    """
    self.balanceOf[_from] -= _value
    self.balanceOf[_to] += _value

    _allowance: uint256 = self.allowance[_from][msg.sender]
    if _allowance != MAX_UINT256:
        self.allowance[_from][msg.sender] = _allowance - _value

    log Transfer(_from, _to, _value)
    return True

event Approval:
    _owner: indexed(address)
    _spender: indexed(address)
    _value: uint256

@external
def approve(_spender: address, _value: uint256) -> bool:
    """
    @notice Approve the passed address to transfer the specified amount of
            tokens on behalf of msg.sender
    @dev Beware that changing an allowance via this method brings the risk
        that someone may use both the old and new allowance by unfortunate
        transaction ordering. This may be mitigated with the use of
        {increaseAllowance} and {decreaseAllowance}.
        https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
    @param _spender The address which will transfer the funds
    @param _value The amount of tokens that may be transferred
    @return bool success
    """
    self.allowance[msg.sender][_spender] = _value

    log Approval(msg.sender, _spender, _value)
    return True

event Approval:
    _owner: indexed(address)
    _spender: indexed(address)
    _value: uint256

@external
def permit(
    _owner: address,
    _spender: address,
    _value: uint256,
    _deadline: uint256,
    _v: uint8,
    _r: bytes32,
    _s: bytes32
) -> bool:
    """
    @notice Approves spender by owner's signature to expend owner's tokens.
        See https://eips.ethereum.org/EIPS/eip-2612.
    @dev Inspired by https://github.com/yearn/yearn-vaults/blob/main/contracts/Vault.vy#L753-L793
    @dev Supports smart contract wallets which implement ERC1271
        https://eips.ethereum.org/EIPS/eip-1271
    @param _owner The address which is a source of funds and has signed the Permit.
    @param _spender The address which is allowed to spend the funds.
    @param _value The amount of tokens to be spent.
    @param _deadline The timestamp after which the Permit is no longer valid.
    @param _v The bytes[64] of the valid secp256k1 signature of permit by owner
    @param _r The bytes[0:32] of the valid secp256k1 signature of permit by owner
    @param _s The bytes[32:64] of the valid secp256k1 signature of permit by owner
    @return True, if transaction completes successfully
    """
    assert _owner != ZERO_ADDRESS
    assert block.timestamp <= _deadline

    nonce: uint256 = self.nonces[_owner]
    digest: bytes32 = keccak256(
        concat(
            b"\x19\x01",
            self.DOMAIN_SEPARATOR,
            keccak256(_abi_encode(PERMIT_TYPEHASH, _owner, _spender, _value, nonce, _deadline))
        )
    )

    if _owner.is_contract:
        sig: Bytes[65] = concat(_abi_encode(_r, _s), slice(convert(_v, bytes32), 31, 1))
        # reentrancy not a concern since this is a staticcall
        assert ERC1271(_owner).isValidSignature(digest, sig) == ERC1271_MAGIC_VAL
    else:
        assert ecrecover(digest, convert(_v, uint256), convert(_r, uint256), convert(_s, uint256)) == _owner

    self.allowance[_owner][_spender] = _value
    self.nonces[_owner] = nonce + 1

    log Approval(_owner, _spender, _value)
    return True

allowance: public(HashMap[address, HashMap[address, uint256]])

event Approval:
    _owner: indexed(address)
    _spender: indexed(address)
    _value: uint256

allowance: public(HashMap[address, HashMap[address, uint256]])

@external
def increaseAllowance(_spender: address, _added_value: uint256) -> bool:
    """
    @notice Increase the allowance granted to `_spender` by the caller
    @dev This is alternative to {approve} that can be used as a mitigation for
        the potential race condition
    @param _spender The address which will transfer the funds
    @param _added_value The amount of to increase the allowance
    @return bool success
    """
    allowance: uint256 = self.allowance[msg.sender][_spender] + _added_value
    self.allowance[msg.sender][_spender] = allowance

    log Approval(msg.sender, _spender, allowance)
    return True

event Approval:
    _owner: indexed(address)
    _spender: indexed(address)
    _value: uint256

allowance: public(HashMap[address, HashMap[address, uint256]])

@external
def decreaseAllowance(_spender: address, _subtracted_value: uint256) -> bool:
    """
    @notice Decrease the allowance granted to `_spender` by the caller
    @dev This is alternative to {approve} that can be used as a mitigation for
        the potential race condition
    @param _spender The address which will transfer the funds
    @param _subtracted_value The amount of to decrease the allowance
    @return bool success
    """
    allowance: uint256 = self.allowance[msg.sender][_spender] - _subtracted_value
    self.allowance[msg.sender][_spender] = allowance

    log Approval(msg.sender, _spender, allowance)
    return True

event Transfer:
    _from: indexed(address)
    _to: indexed(address)
    _value: uint256

@external
def mint(_to: address, _value: uint256) -> bool:
    """
    @dev Mint an amount of the token and assigns it to an account.
        This encapsulates the modification of balances such that the
        proper events are emitted.
    @param _to The account that will receive the created tokens.
    @param _value The amount that will be created.
    """
    assert msg.sender == self.minter

    self.totalSupply += _value
    self.balanceOf[_to] += _value

    log Transfer(ZERO_ADDRESS, _to, _value)
    return True

event Transfer:
    _from: indexed(address)
    _to: indexed(address)
    _value: uint256

@external
def burnFrom(_to: address, _value: uint256) -> bool:
    """
    @dev Burn an amount of the token from a given account.
    @param _to The account whose tokens will be burned.
    @param _value The amount that will be burned.
    """
    assert msg.sender == self.minter

    self.totalSupply -= _value
    self.balanceOf[_to] -= _value

    log Transfer(_to, ZERO_ADDRESS, _value)
    return True

event Transfer:
    _from: indexed(address)
    _to: indexed(address)
    _value: uint256

@external
def initialize(_name: String[64], _symbol: String[32], _pool: address):
    assert self.minter == ZERO_ADDRESS  # dev: check that we call it from factory

    self.name = _name
    self.symbol = _symbol
    self.minter = _pool

    self.DOMAIN_SEPARATOR = keccak256(
        _abi_encode(EIP712_TYPEHASH, keccak256(_name), keccak256(VERSION), chain.id, self)
    )

    # fire a transfer event so block explorers identify the contract as an ERC20
    log Transfer(ZERO_ADDRESS, msg.sender, 0)