e96164feea
* Rename current ERC721 implementation to BaseERC721
* Implement ERC721 optional & approveAll functionality
* Support for new ERC721 interface
- Tests for new features are pending
- ERC721 is abstract, since it requires metadata implementation
- Move some methods into DeprecatedERC721 contract
- Reorganise base vs full implementation
- Pending tokenByIndex
* Add more tests for ERC721
* Implement suggestions by @dekz
* Update comments in ERC721 contracts
* Implement tokensByIndex extension
- Remove restrictions from mock mint and burn calls
* Add default implementation for metadata URI
This allows token implementation to be non-abstract
* Allow operators to call approve on a token
* Remove gas stipend restriction in call to 721 receiver
* Remove deprecated implementation
We only want to keep the interface, for interacting with already deployed contracts
* Add notice to isContract helper on constract constructors
* Change natspec delimiters for consistency
* Minor linting fixes
* Add constant modifier to ERC721_RECEIVED magic value
* Use 4-params safeTransferFrom for implementing the 3-params overload
* Minor text changes in natspec comments
* Use address(0) instead of 0 or 0x0
* Use if-statements instead of boolean one-liners for clarity
:-(
* Keep ownedTokensCount state var in sync in full ERC721 implementation
* Fix incorrect comparison when burning ERC721 tokens with metadata
* Use address(0) instead of 0 in one more place in ERC721
* Throw when querying balance for the zero address
Required by the spec
* Update links to approved version of EIP721
* Use explicit size for uint
* Remove unneeded internal function in ERC721
Also rename addToken and removeToken for added clarity
* Use underscore instead of 'do' prefix for internal methods in ERC721
* Fix failing test due to events reordering in ERC721 safe transfer
* Fix bug introduced in 74db03ba06
* Remove do prefix for internal setTokenUri method
* Allow transfers to self in ERC721
30 lines
1.2 KiB
Solidity
30 lines
1.2 KiB
Solidity
pragma solidity ^0.4.18;
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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,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 constant ERC721_RECEIVED = 0xf0b9e5ba;
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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. This function MUST use 50,000 gas or less. Return of other
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* than the magic value MUST result in the transaction being reverted.
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* Note: the contract address is always the message sender.
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* @param _from The sending address
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* @param _tokenId The NFT identifier which is being transfered
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* @param _data Additional data with no specified format
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* @return `bytes4(keccak256("onERC721Received(address,uint256,bytes)"))`
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*/
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function onERC721Received(address _from, uint256 _tokenId, bytes _data) public returns(bytes4);
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}
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