forked from DecentralizedClimateFoundation/DCIPs
127 lines
7.0 KiB
Solidity
127 lines
7.0 KiB
Solidity
///SPDX-License-Identifier: CC0-1.0
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pragma solidity ^0.8.0;
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/// @title ERC-721 Non-Fungible Token Standard
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/// @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
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/// Note: the ERC-165 identifier for this interface is 0x80ac58cd
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interface ERC721 /* is ERC165 */ {
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/// @dev This emits when ownership of any NFT changes by any mechanism.
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/// This event emits when NFTs are created (`from` == 0) and destroyed
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/// (`to` == 0). Exception: during contract creation, any number of NFTs
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/// may be created and assigned without emitting Transfer. At the time of
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/// any transfer, the approved address for that NFT (if any) is reset to none.
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event Transfer(address indexed _from, address indexed _to, uint256 indexed _tokenId);
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/// @dev This emits when the approved address for an NFT is changed or
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/// reaffirmed. The zero address indicates there is no approved address.
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/// When a Transfer event emits, this also indicates that the approved
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/// address for that NFT (if any) is reset to none.
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event Approval(address indexed _owner, address indexed _approved, uint256 indexed _tokenId);
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/// @dev This emits when an operator is enabled or disabled for an owner.
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/// The operator can manage all NFTs of the owner.
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event ApprovalForAll(address indexed _owner, address indexed _operator, bool _approved);
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/// @notice Count all NFTs assigned to an owner
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/// @dev NFTs assigned to the zero address are considered invalid, and this
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/// function throws for queries about the zero address.
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/// @param _owner An address for whom to query the balance
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/// @return The number of NFTs owned by `_owner`, possibly zero
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function balanceOf(address _owner) external view returns (uint256);
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/// @notice Find the owner of an NFT
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/// @dev NFTs assigned to zero address are considered invalid, and queries
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/// about them do throw.
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/// @param _tokenId The identifier for an NFT
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/// @return The address of the owner of the NFT
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function ownerOf(uint256 _tokenId) external view returns (address);
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/// @notice Transfers the ownership of an NFT from one address to another address
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/// @dev Throws unless `msg.sender` is the current owner, an authorized
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/// operator, or the approved address for this NFT. Throws if `_from` is
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/// not the current owner. Throws if `_to` is the zero address. Throws if
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/// `_tokenId` is not a valid NFT. When transfer is complete, this function
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/// checks if `_to` is a smart contract (code size > 0). If so, it calls
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/// `onERC721Received` on `_to` and throws if the return value is not
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/// `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`.
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/// @param _from The current owner of the NFT
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/// @param _to The new owner
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/// @param _tokenId The NFT to transfer
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/// @param data Additional data with no specified format, sent in call to `_to`
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function safeTransferFrom(address _from, address _to, uint256 _tokenId, bytes memory data) external payable;
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/// @notice Transfers the ownership of an NFT from one address to another address
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/// @dev This works identically to the other function with an extra data parameter,
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/// except this function just sets data to ""
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/// @param _from The current owner of the NFT
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/// @param _to The new owner
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/// @param _tokenId The NFT to transfer
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function safeTransferFrom(address _from, address _to, uint256 _tokenId) external payable;
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/// @notice Transfer ownership of an NFT -- THE CALLER IS RESPONSIBLE
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/// TO CONFIRM THAT `_to` IS CAPABLE OF RECEIVING NFTS OR ELSE
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/// THEY MAY BE PERMANENTLY LOST
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/// @dev Throws unless `msg.sender` is the current owner, an authorized
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/// operator, or the approved address for this NFT. Throws if `_from` is
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/// not the current owner. Throws if `_to` is the zero address. Throws if
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/// `_tokenId` is not a valid NFT.
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/// @param _from The current owner of the NFT
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/// @param _to The new owner
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/// @param _tokenId The NFT to transfer
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function transferFrom(address _from, address _to, uint256 _tokenId) external payable;
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/// @notice Set or reaffirm the approved address for an NFT
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/// @dev The zero address indicates there is no approved address.
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/// @dev Throws unless `msg.sender` is the current NFT owner, or an authorized
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/// operator of the current owner.
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/// @param _approved The new approved NFT controller
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/// @param _tokenId The NFT to approve
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function approve(address _approved, uint256 _tokenId) external payable;
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/// @notice Enable or disable approval for a third party ("operator") to manage
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/// all of `msg.sender`'s assets.
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/// @dev Emits the ApprovalForAll event. The contract MUST allow
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/// multiple operators per owner.
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/// @param _operator Address to add to the set of authorized operators.
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/// @param _approved True if the operator is approved, false to revoke approval
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function setApprovalForAll(address _operator, bool _approved) external;
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/// @notice Get the approved address for a single NFT
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/// @dev Throws if `_tokenId` is not a valid NFT
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/// @param _tokenId The NFT to find the approved address for
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/// @return The approved address for this NFT, or the zero address if there is none
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function getApproved(uint256 _tokenId) external view returns (address);
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/// @notice Query if an address is an authorized operator for another address
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/// @param _owner The address that owns the NFTs
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/// @param _operator The address that acts on behalf of the owner
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/// @return True if `_operator` is an approved operator for `_owner`, false otherwise
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function isApprovedForAll(address _owner, address _operator) external view returns (bool);
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}
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interface ERC165 {
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/// @notice Query if a contract implements an interface
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/// @param interfaceID The interface identifier, as specified in ERC-165
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/// @dev Interface identification is specified in ERC-165. This function
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/// uses less than 30,000 gas.
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/// @return `true` if the contract implements `interfaceID` and
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/// `interfaceID` is not 0xffffffff, `false` otherwise
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function supportsInterface(bytes4 interfaceID) external view returns (bool);
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}
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interface ERC721TokenReceiver {
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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
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/// recipient after a `transfer`. This function MAY throw to revert and reject the transfer. Return
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/// of other than the magic value MUST result in the transaction being reverted.
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/// @notice 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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/// unless throwing
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function onERC721Received(address _operator, address _from, uint256 _tokenId, bytes memory _data) external returns(bytes4);
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}
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