39 lines
1.4 KiB
Solidity
39 lines
1.4 KiB
Solidity
pragma solidity ^0.4.24;
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/**
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* @title ERC721 token receiver interface
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* @dev Interface for any contract that wants to support safeTransfers
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* from ERC721 asset contracts.
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*/
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contract ERC721Receiver {
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/**
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* @dev Magic value to be returned upon successful reception of an NFT
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* Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`,
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* which can be also obtained as `ERC721Receiver(0).onERC721Received.selector`
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*/
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bytes4 internal constant ERC721_RECEIVED = 0x150b7a02;
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/**
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* @notice Handle the receipt of an NFT
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* @dev The ERC721 smart contract calls this function on the recipient
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* after a `safetransfer`. This function MAY throw to revert and reject the
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* transfer. Return of other than the magic value MUST result in the
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* transaction being reverted.
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* Note: the contract address is always the message sender.
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* @param _operator The address which called `safeTransferFrom` function
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* @param _from The address which previously owned the token
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* @param _tokenId The NFT identifier which is being transferred
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* @param _data Additional data with no specified format
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* @return `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`
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*/
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function onERC721Received(
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address _operator,
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address _from,
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uint256 _tokenId,
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bytes _data
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)
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public
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returns(bytes4);
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}
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