diff options
Diffstat (limited to 'contracts/erc721/contracts/src/MintableERC721Token.sol')
-rw-r--r-- | contracts/erc721/contracts/src/MintableERC721Token.sol | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/contracts/erc721/contracts/src/MintableERC721Token.sol b/contracts/erc721/contracts/src/MintableERC721Token.sol new file mode 100644 index 000000000..27326d857 --- /dev/null +++ b/contracts/erc721/contracts/src/MintableERC721Token.sol @@ -0,0 +1,82 @@ +/* + + 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 "./ERC721Token.sol"; + + +contract MintableERC721Token is + ERC721Token +{ + /// @dev Function to mint a new token + /// Reverts if the given token ID already exists + /// @param _to Address of the beneficiary that will own the minted token + /// @param _tokenId ID of the token to be minted by the msg.sender + function _mint(address _to, uint256 _tokenId) + internal + { + require( + _to != address(0), + "ERC721_ZERO_TO_ADDRESS" + ); + + address owner = owners[_tokenId]; + require( + owner == address(0), + "ERC721_OWNER_ALREADY_EXISTS" + ); + + owners[_tokenId] = _to; + balances[_to] = safeAdd(balances[_to], 1); + + emit Transfer( + address(0), + _to, + _tokenId + ); + } + + /// @dev Function to burn a token + /// Reverts if the given token ID doesn't exist + /// @param _owner Owner of token with given token ID + /// @param _tokenId ID of the token to be burned by the msg.sender + function _burn(address _owner, uint256 _tokenId) + internal + { + require( + _owner != address(0), + "ERC721_ZERO_OWNER_ADDRESS" + ); + + address owner = owners[_tokenId]; + require( + owner == _owner, + "ERC721_OWNER_MISMATCH" + ); + + owners[_tokenId] = address(0); + balances[_owner] = safeSub(balances[_owner], 1); + + emit Transfer( + _owner, + address(0), + _tokenId + ); + } +} |