OnERC721ReceivedExtension

Standard Specifications

LSP-17-Extensions

Solidity implementation

OnERC721ReceivedExtension.sol

LSP17 Extension that can be attached to a LSP17Extendable contract to allow it to receive ERC721 tokens via safeTransferFrom.

Public Methods

Public methods are accessible externally from users, allowing interaction with this function from dApps or other smart contracts. When marked as 'public', a method can be called both externally and internally, on the other hand, when marked as 'external', a method can only be called externally.

VERSION

References

• Specification details: LSP-17-Extensions
• Solidity implementation: OnERC721ReceivedExtension.sol
• Function signature: VERSION()
• Function selector: 0xffa1ad74

function VERSION() external view returns (string);

Contract version.

Returns

Name	Type	Description
0	string	-

onERC721Received

References

• Specification details: LSP-17-Extensions
• Solidity implementation: OnERC721ReceivedExtension.sol
• Function signature: onERC721Received(address,address,uint256,bytes)
• Function selector: 0x150b7a02

function onERC721Received(
  address,
  address,
  uint256,
  bytes
) external nonpayable returns (bytes4);

See IERC721Receiver-onERC721Received. Always returns IERC721Receiver.onERC721Received.selector.

Parameters

Name	Type	Description
_0	address	-
_1	address	-
_2	uint256	-
_3	bytes	-

Returns

Name	Type	Description
0	bytes4	-

supportsInterface

References

• Specification details: LSP-17-Extensions
• Solidity implementation: OnERC721ReceivedExtension.sol
• Function signature: supportsInterface(bytes4)
• Function selector: 0x01ffc9a7

function supportsInterface(bytes4 interfaceId) external view returns (bool);

See IERC165-supportsInterface.

Parameters

Name	Type	Description
interfaceId	bytes4	-

Returns

Name	Type	Description
0	bool	-

Internal Methods

Any method labeled as internal serves as utility function within the contract. They can be used when writing solidity contracts that inherit from this contract. These methods can be extended or modified by overriding their internal behavior to suit specific needs.

Internal functions cannot be called externally, whether from other smart contracts, dApp interfaces, or backend services. Their restricted accessibility ensures that they remain exclusively available within the context of the current contract, promoting controlled and encapsulated usage of these internal utilities.

_extendableMsgData

function _extendableMsgData() internal view returns (bytes);

Returns the original msg.data passed to the extendable contract without the appended msg.sender and msg.value.

_extendableMsgSender

function _extendableMsgSender() internal view returns (address);

Returns the original msg.sender calling the extendable contract.

_extendableMsgValue

function _extendableMsgValue() internal view returns (uint256);

Returns the original msg.value sent to the extendable contract.