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author | Amir Bandeali <abandeali1@gmail.com> | 2018-07-27 08:18:43 +0800 |
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committer | Amir Bandeali <abandeali1@gmail.com> | 2018-08-17 08:31:21 +0800 |
commit | f5459164d283c4b55a0514faf3213334c45fea50 (patch) | |
tree | c1b2bd707553004f87a959d93c9f15b3f09fd292 /packages/contracts/src/2.0.0/tokens/ERC20Token | |
parent | 2743eee044edfd3dafc012e31f60ecf4ee0ce30f (diff) | |
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Restructure directories
Diffstat (limited to 'packages/contracts/src/2.0.0/tokens/ERC20Token')
4 files changed, 150 insertions, 4 deletions
diff --git a/packages/contracts/src/2.0.0/tokens/ERC20Token/ERC20Token.sol b/packages/contracts/src/2.0.0/tokens/ERC20Token/ERC20Token.sol index 563c84b5b..db2d09b9d 100644 --- a/packages/contracts/src/2.0.0/tokens/ERC20Token/ERC20Token.sol +++ b/packages/contracts/src/2.0.0/tokens/ERC20Token/ERC20Token.sol @@ -46,9 +46,16 @@ contract ERC20Token is balances[_to] + _value >= balances[_to], "UINT256_OVERFLOW" ); + balances[msg.sender] -= _value; balances[_to] += _value; - emit Transfer(msg.sender, _to, _value); + + emit Transfer( + msg.sender, + _to, + _value + ); + return true; } @@ -77,10 +84,17 @@ contract ERC20Token is balances[_to] + _value >= balances[_to], "UINT256_OVERFLOW" ); + balances[_to] += _value; balances[_from] -= _value; allowed[_from][msg.sender] -= _value; - emit Transfer(_from, _to, _value); + + emit Transfer( + _from, + _to, + _value + ); + return true; } diff --git a/packages/contracts/src/2.0.0/tokens/ERC20Token/IERC20Token.sol b/packages/contracts/src/2.0.0/tokens/ERC20Token/IERC20Token.sol index a752d3869..462be17fd 100644 --- a/packages/contracts/src/2.0.0/tokens/ERC20Token/IERC20Token.sol +++ b/packages/contracts/src/2.0.0/tokens/ERC20Token/IERC20Token.sol @@ -21,13 +21,13 @@ pragma solidity 0.4.24; contract IERC20Token { - // solhint-disable-next-line no-simple-event-func-name + // solhint-disable no-simple-event-func-name event Transfer( address indexed _from, address indexed _to, uint256 _value ); - + event Approval( address indexed _owner, address indexed _spender, diff --git a/packages/contracts/src/2.0.0/tokens/ERC20Token/MintableERC20Token.sol b/packages/contracts/src/2.0.0/tokens/ERC20Token/MintableERC20Token.sol new file mode 100644 index 000000000..cd1c7b4bb --- /dev/null +++ b/packages/contracts/src/2.0.0/tokens/ERC20Token/MintableERC20Token.sol @@ -0,0 +1,61 @@ +/* + + Copyright 2018 ZeroEx Intl. + + 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 0.4.24; + +import "../../utils/SafeMath/SafeMath.sol"; +import "./UnlimitedAllowanceERC20Token.sol"; + + +contract MintableERC20Token is + SafeMath, + UnlimitedAllowanceERC20Token +{ + + /// @dev Mints new tokens + /// @param _to Address of the beneficiary that will own the minted token + /// @param _value Amount of tokens to mint + function _mint(address _to, uint256 _value) + internal + { + balances[_to] = safeAdd(_value, balances[_to]); + _totalSupply = safeAdd(_totalSupply, _value); + + emit Transfer( + address(0), + _to, + _value + ); + } + + /// @dev Mints new tokens + /// @param _owner Owner of tokens that will be burned + /// @param _value Amount of tokens to burn + function _burn(address _owner, uint256 _value) + internal + { + balances[_owner] = safeSub(balances[_owner], _value); + _totalSupply = safeSub(_totalSupply, _value); + + emit Transfer( + _owner, + address(0), + _value + ); + } +} diff --git a/packages/contracts/src/2.0.0/tokens/ERC20Token/UnlimitedAllowanceERC20Token.sol b/packages/contracts/src/2.0.0/tokens/ERC20Token/UnlimitedAllowanceERC20Token.sol new file mode 100644 index 000000000..e6f7c063e --- /dev/null +++ b/packages/contracts/src/2.0.0/tokens/ERC20Token/UnlimitedAllowanceERC20Token.sol @@ -0,0 +1,71 @@ +/* + + Copyright 2018 ZeroEx Intl. + + 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 0.4.24; + +import "../ERC20Token/ERC20Token.sol"; + + +contract UnlimitedAllowanceERC20Token is + ERC20Token +{ + + uint256 constant internal MAX_UINT = 2**256 - 1; + + /// @dev ERC20 transferFrom, modified such that an allowance of MAX_UINT represents an unlimited allowance. See https://github.com/ethereum/EIPs/issues/717 + /// @param _from Address to transfer from. + /// @param _to Address to transfer to. + /// @param _value Amount to transfer. + /// @return Success of transfer. + function transferFrom( + address _from, + address _to, + uint256 _value + ) + external + returns (bool) + { + uint256 allowance = allowed[_from][msg.sender]; + require( + balances[_from] >= _value, + "ERC20_INSUFFICIENT_BALANCE" + ); + require( + allowance >= _value, + "ERC20_INSUFFICIENT_ALLOWANCE" + ); + require( + balances[_to] + _value >= balances[_to], + "UINT256_OVERFLOW" + ); + + balances[_to] += _value; + balances[_from] -= _value; + if (allowance < MAX_UINT) { + allowed[_from][msg.sender] -= _value; + } + + emit Transfer( + _from, + _to, + _value + ); + + return true; + } +} |