ERC721Vault
This vault holds all ERC721 tokens that users have deposited. It also manages the mapping between canonical tokens and their bridged tokens.
sendToken
function sendToken(struct BaseNFTVault.BridgeTransferOp opt) external payableTransfers ERC721 tokens to this vault and sends a message to the destination chain so the user can receive the same (bridged) tokens by invoking the message call.
Parameters
| Name | Type | Description |
|---|---|---|
| opt | struct BaseNFTVault.BridgeTransferOp | Option for sending the ERC721 token. |
receiveToken
function receiveToken(struct BaseNFTVault.CanonicalNFT ctoken, address from, address to, uint256[] tokenIds) external payableReceive bridged ERC721 tokens and handle them accordingly.
Parameters
| Name | Type | Description |
|---|---|---|
| ctoken | struct BaseNFTVault.CanonicalNFT | Canonical NFT data for the token being received. |
| from | address | Source address. |
| to | address | Destination address. |
| tokenIds | uint256[] | Array of token IDs being received. |
onMessageRecalled
function onMessageRecalled(struct IBridge.Message message) external payableRelease deposited ERC721 token(s) back to the user on the source chain with a proof that the message processing on the destination Bridge has failed.
Parameters
| Name | Type | Description |
|---|---|---|
| message | struct IBridge.Message | The message that corresponds to the ERC721 deposit on the source chain. |
onERC721Received
function onERC721Received(address, address, uint256, bytes) external pure returns (bytes4)_Whenever an {IERC721} tokenId token is transferred to this contract via {IERC721-safeTransferFrom}
by operator from from, this function is called.
It must return its Solidity selector to confirm the token transfer. If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
The selector can be obtained in Solidity with IERC721Receiver.onERC721Received.selector._
supportsInterface
function supportsInterface(bytes4 interfaceId) public view virtual returns (bool)_Returns true if this contract implements the interface defined by
interfaceId. See the corresponding
https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP (opens in a new tab) section]
to learn more about how these ids are created.
This function call must use less than 30 000 gas._
ProxiedERC721Vault
Proxied version of the parent contract.