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/*
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/LibBytes/LibBytes.sol";
import "../tokens/ERC721Token/IERC721Token.sol";
import "./mixins/MTransfer.sol";
contract MixinTransfer is
MTransfer
{
using LibBytes for bytes;
bytes4 constant internal ERC20_TRANSFER_SELECTOR = bytes4(keccak256("transfer(address,uint256)"));
bytes4 constant internal ERC721_RECEIVED = bytes4(keccak256("onERC721Received(address,uint256,bytes)"));
bytes4 constant internal ERC721_RECEIVED_OPERATOR = bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"));
function onERC721Received(
address,
uint256,
bytes memory
)
public
pure
returns(bytes4)
{
return ERC721_RECEIVED;
}
function onERC721Received(
address,
address,
uint256,
bytes memory
)
public
pure
returns(bytes4)
{
return ERC721_RECEIVED_OPERATOR;
}
function transferERC20Token(
address token,
address to,
uint256 amount
)
internal
{
// Transfer tokens.
// We do a raw call so we can check the success separate
// from the return data.
bool success = token.call(abi.encodeWithSelector(
ERC20_TRANSFER_SELECTOR,
to,
amount
));
require(
success,
"TRANSFER_FAILED"
);
// Check return data.
// If there is no return data, we assume the token incorrectly
// does not return a bool. In this case we expect it to revert
// on failure, which was handled above.
// If the token does return data, we require that it is a single
// value that evaluates to true.
assembly {
if returndatasize {
success := 0
if eq(returndatasize, 32) {
// First 64 bytes of memory are reserved scratch space
returndatacopy(0, 0, 32)
success := mload(0)
}
}
}
require(
success,
"TRANSFER_FAILED"
);
}
function transferERC721Token(
bytes memory assetData,
address to
)
internal
{
// Decode asset data.
address token = assetData.readAddress(16);
uint256 tokenId = assetData.readUint256(36);
bytes memory receiverData = assetData.readBytesWithLength(100);
IERC721Token(token).safeTransferFrom(
address(this),
to,
tokenId,
receiverData
);
}
}
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