ColleCollection

This contract represents a collection of unique tokens (NFTs) which mirror physical assets and extends ERC721 with additional functionality.

The contract is using OpenZeppelin contracts for most of the ERC721 functionality and has extra functions for additional needs.

nextTokenId

uint256 nextTokenId

tokenSaleMetadataIPFS

mapping(uint256 => string) tokenSaleMetadataIPFS

constructor

constructor(string _name, string _symbol) public

Construct a new NFT collection contract.

Parameters

Name	Type	Description
_name	string	The name of the token.
_symbol	string	The symbol of the token.

onlyOwnerApprovedEOAOrVault

modifier onlyOwnerApprovedEOAOrVault(uint256 _tokenId)

Guards ERC721 transfers to the token owner (EOA or contract), approved EOA or approved Vault.

Restricts approved non-vault contracts from transferring tokens to break 3rd party transfers of mirrored assets.

Parameters

Name	Type	Description
_tokenId	uint256	The token id to guard against.

mint

function mint(string _uri, address _receiver) public

Mints a new token.

This function can only be called by a Colle.

Parameters

Name	Type	Description
_uri	string	The token URI.
_receiver	address	The address that will receive the minted token.

updateSaleMetadata

function updateSaleMetadata(uint256 _tokenId, string _ipfsHash) public

Updates the sale metadata for a token.

This function can only be called by a Colle or the owner of the token.

Parameters

Name	Type	Description
_tokenId	uint256	The ID of the token to update.
_ipfsHash	string	The new IPFS hash for the token metadata.

getSaleMetadata

function getSaleMetadata(uint256 _tokenId) public view returns (string)

Returns the sale metadata for a token.

Parameters

Name	Type	Description
_tokenId	uint256	The ID of the token to query.

Return Values

Name	Type	Description
[0]	string	The IPFS hash of the sale metadata.

isSaleMetadataSet

function isSaleMetadataSet(uint256 _tokenId) public view returns (bool)

Checks if sale metadata is set for a token.

Parameters

Name	Type	Description
_tokenId	uint256	The ID of the token to check.

Return Values

Name	Type	Description
[0]	bool	True if the token has sale metadata set, false otherwise.

permitApprove

function permitApprove(address _to, uint256 _tokenId, struct Signature _signature) public

Approves an address to transfer a specific token.

Parameters

Name	Type	Description
_to	address	The address to approve.
_tokenId	uint256	The ID of the token to approve.
_signature	struct Signature	The signature from the approving address, the 'from', including deadline

permitSetApprovalForAll

function permitSetApprovalForAll(address _operator, bool _approve, struct Signature _signature) public

Approves an address to transfer any tokens owned by the sender.

Parameters

Name	Type	Description
_operator	address	The address to approve.
_approve	bool	Whether to approve or revoke approval
_signature	struct Signature	The signature, deadline and signer from the owner of the token.

permitSafeTransfer

function permitSafeTransfer(address _to, uint256 _tokenId, struct Signature _signature) public

Transfers a token from one address to another, verifying the validity of a signature.

Parameters

Name	Type	Description
_to	address	The address to receive the token.
_tokenId	uint256	The ID of the token to transfer.
_signature	struct Signature	The signature, deadline and signer from the owner of the token.

getNextTokenId

function getNextTokenId() public view returns (uint256)

Returns the ID of the next token that will be minted.

Return Values

Name	Type	Description
[0]	uint256	The ID of the next token.

supportsInterface

function supportsInterface(bytes4 _interfaceId) public view virtual returns (bool)

Checks if the contract implements an interface.

Parameters

Name	Type	Description
_interfaceId	bytes4	The ID of the interface.

Return Values

Name	Type	Description
[0]	bool	True if the contract implements the interface, false otherwise.

transferFrom

function transferFrom(address _from, address _to, uint256 _tokenId) public virtual

Transfers a token from one address to another.

In order to prevent mirrored assets from being traded on 3rd party markets, only direct transfer or Marketplace vault transfer cause call transferFrom.

Parameters

Name	Type	Description
_from	address	The current owner of the token.
_to	address	The address to receive the token.
_tokenId	uint256	The ID of the token to transfer.

safeTransferFrom

function safeTransferFrom(address _from, address _to, uint256 _tokenId) public virtual

Safely transfers a token from one address to another.

In order to prevent mirrored assets from being traded on 3rd party markets, only direct transfer or Marketplace vault transfer cause call safeTransferFrom.

Parameters

Name	Type	Description
_from	address	The current owner of the token.
_to	address	The address to receive the token.
_tokenId	uint256	The ID of the token to transfer.

safeTransferFrom

function safeTransferFrom(address _from, address _to, uint256 _tokenId, bytes _data) public virtual

Safely transfers a token from one address to another.

In order to prevent mirrored assets from being traded on 3rd party markets, only direct transfer or Marketplace vault transfer cause call safeTransferFrom.

Parameters

Name	Type	Description
_from	address	The current owner of the token.
_to	address	The address to receive the token.
_tokenId	uint256	The ID of the token to transfer.
_data	bytes	Additional data with no specified format.

_getPermitApproveHash

function _getPermitApproveHash(struct Signature _signature, address _to, uint256 _tokenId) internal view virtual returns (bytes32)

Internal function to get the expected EIP-712 signed hash to permit approving a token transfer

Parameters

Name	Type	Description
_signature	struct Signature	The signature, deadline and signer from the owner of the token.
_to	address	The address to approve.
_tokenId	uint256	The ID of the token to approve.

_getPermitSetApprovalForAllHash

function _getPermitSetApprovalForAllHash(struct Signature _signature, address _operator, bool _approve) internal view virtual returns (bytes32)

Internal function to get the expected EIP-712 signed hash to permit approving a token transfer

Parameters

Name	Type	Description
_signature	struct Signature	The signature, deadline and signer from the owner of the tokens.
_operator	address	The address to approve.
_approve	bool	Whether to approve or revoke approval

_getPermitSafeTransferHash

function _getPermitSafeTransferHash(struct Signature _signature, address _to, uint256 _tokenId) internal view virtual returns (bytes32)

Internal function to get the expected EIP-712 signed hash to permit transfering a token

Parameters

Name	Type	Description
_signature	struct Signature	The signature, deadline and signer from the owner of the tokens.
_to	address	The address to transfer to.
_tokenId	uint256	The ID of the token to transfer.