159 lines
6.4 KiB
Solidity
159 lines
6.4 KiB
Solidity
/*
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Copyright 2018 ZeroEx Intl.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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pragma solidity 0.4.24;
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contract IERC721Token {
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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(
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address indexed _from,
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address indexed _to,
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uint256 indexed _tokenId
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);
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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(
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address indexed _owner,
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address indexed _approved,
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uint256 indexed _tokenId
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);
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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(
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address indexed _owner,
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address indexed _operator,
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bool _approved
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);
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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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/// perator, 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(
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address _from,
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address _to,
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uint256 _tokenId,
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bytes _data
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)
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external;
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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(
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address _from,
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address _to,
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uint256 _tokenId
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)
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external;
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/// @notice Change 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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/// 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)
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external;
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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)
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external;
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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)
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external
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view
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returns (uint256);
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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(
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address _from,
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address _to,
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uint256 _tokenId
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)
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public;
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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)
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public
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view
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returns (address);
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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)
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public
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view
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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)
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public
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view
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returns (bool);
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}
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