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function balanceOf(...) (ethereum#5172)
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| // SPDX-License-Identifier: CC0-1.0 | ||
| pragma solidity ^0.8.6; | ||
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| // OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol) | ||
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| // OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol) | ||
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| /** | ||
| * @dev Interface of the ERC165 standard, as defined in the | ||
| * https://eips.ethereum.org/EIPS/eip-165[EIP]. | ||
| * | ||
| * Implementers can declare support of contract interfaces, which can then be | ||
| * queried by others ({ERC165Checker}). | ||
| * | ||
| * For an implementation, see {ERC165}. | ||
| */ | ||
| interface IERC165 { | ||
| /** | ||
| * @dev 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 section] | ||
| * to learn more about how these ids are created. | ||
| * | ||
| * This function call must use less than 30 000 gas. | ||
| */ | ||
| function supportsInterface(bytes4 interfaceId) external view returns (bool); | ||
| } | ||
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| /** | ||
| * @dev Implementation of the {IERC165} interface. | ||
| * | ||
| * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check | ||
| * for the additional interface id that will be supported. For example: | ||
| * | ||
| * ```solidity | ||
| * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) { | ||
| * return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId); | ||
| * } | ||
| * ``` | ||
| * | ||
| * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation. | ||
| */ | ||
| abstract contract ERC165 is IERC165 { | ||
| /** | ||
| * @dev See {IERC165-supportsInterface}. | ||
| */ | ||
| function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) { | ||
| return interfaceId == type(IERC165).interfaceId; | ||
| } | ||
| } | ||
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| interface IERC721Metadata { | ||
| function name() external view returns (string memory); | ||
| function symbol() external view returns (string memory); | ||
| function tokenURI(uint256 tokenId) external view returns (string memory); | ||
| } | ||
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| /// @title Account-bound tokens | ||
| /// @dev See https://eips.ethereum.org/EIPS/eip-4973 | ||
| /// Note: the ERC-165 identifier for this interface is 0x5164cf47. | ||
| interface IERC4973 /* is ERC165, ERC721Metadata */ { | ||
| /// @dev This emits when a new token is created and bound to an account by | ||
| /// any mechanism. | ||
| /// Note: For a reliable `from` parameter, retrieve the transaction's | ||
| /// authenticated `from` field. | ||
| event Attest(address indexed to, uint256 indexed tokenId); | ||
| /// @dev This emits when an existing ABT is revoked from an account and | ||
| /// destroyed by any mechanism. | ||
| /// Note: For a reliable `from` parameter, retrieve the transaction's | ||
| /// authenticated `from` field. | ||
| event Revoke(address indexed to, uint256 indexed tokenId); | ||
| /// @notice Count all ABTs assigned to an owner | ||
| /// @dev ABTs assigned to the zero address are considered invalid, and this | ||
| /// function throws for queries about the zero address. | ||
| /// @param owner An address for whom to query the balance | ||
| /// @return The number of ABTs owned by `owner`, possibly zero | ||
| function balanceOf(address owner) external view returns (uint256); | ||
| /// @notice Find the address bound to an ERC4973 account-bound token | ||
| /// @dev ABTs assigned to zero address are considered invalid, and queries | ||
| /// about them do throw. | ||
| /// @param tokenId The identifier for an ABT | ||
| /// @return The address of the owner bound to the ABT | ||
| function ownerOf(uint256 tokenId) external view returns (address); | ||
| /// @notice Destroys `tokenId`. At any time, an ABT receiver must be able to | ||
| /// disassociate themselves from an ABT publicly through calling this | ||
| /// function. | ||
| /// @dev Must emit a `event Revoke` with the `address to` field pointing to | ||
| /// the zero address. | ||
| /// @param tokenId The identifier for an ABT | ||
| function burn(uint256 tokenId) external; | ||
| } | ||
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| /// @notice Reference implementation of EIP-4973 tokens. | ||
| /// @author TimDaub (https://github.com/rugpullindex/ERC4973/blob/master/src/ERC4973.sol) | ||
| abstract contract ERC4973 is ERC165, IERC721Metadata, IERC4973 { | ||
| string private _name; | ||
| string private _symbol; | ||
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| mapping(uint256 => address) private _owners; | ||
| mapping(uint256 => string) private _tokenURIs; | ||
| mapping(address => uint256) private _balances; | ||
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| constructor( | ||
| string memory name_, | ||
| string memory symbol_ | ||
| ) { | ||
| _name = name_; | ||
| _symbol = symbol_; | ||
| } | ||
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| function supportsInterface(bytes4 interfaceId) public view override returns (bool) { | ||
| return | ||
| interfaceId == type(IERC721Metadata).interfaceId || | ||
| interfaceId == type(IERC4973).interfaceId || | ||
| super.supportsInterface(interfaceId); | ||
| } | ||
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| function name() public view virtual override returns (string memory) { | ||
| return _name; | ||
| } | ||
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| function symbol() public view virtual override returns (string memory) { | ||
| return _symbol; | ||
| } | ||
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| function tokenURI(uint256 tokenId) public view virtual override returns (string memory) { | ||
| require(_exists(tokenId), "tokenURI: token doesn't exist"); | ||
| return _tokenURIs[tokenId]; | ||
| } | ||
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| function burn(uint256 tokenId) public virtual override { | ||
| require(msg.sender == ownerOf(tokenId), "burn: sender must be owner"); | ||
| _burn(tokenId); | ||
| } | ||
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| function balanceOf(address owner) public view virtual override returns (uint256) { | ||
| require(owner != address(0), "balanceOf: address zero is not a valid owner"); | ||
| return _balances[owner]; | ||
| } | ||
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| function ownerOf(uint256 tokenId) public view virtual returns (address) { | ||
| address owner = _owners[tokenId]; | ||
| require(owner != address(0), "ownerOf: token doesn't exist"); | ||
| return owner; | ||
| } | ||
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| function _exists(uint256 tokenId) internal view virtual returns (bool) { | ||
| return _owners[tokenId] != address(0); | ||
| } | ||
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| function _mint( | ||
| address to, | ||
| uint256 tokenId, | ||
| string memory uri | ||
| ) internal virtual returns (uint256) { | ||
| require(!_exists(tokenId), "mint: tokenID exists"); | ||
| _balances[to] += 1; | ||
| _owners[tokenId] = to; | ||
| _tokenURIs[tokenId] = uri; | ||
| emit Attest(to, tokenId); | ||
| return tokenId; | ||
| } | ||
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| function _burn(uint256 tokenId) internal virtual { | ||
| address owner = ownerOf(tokenId); | ||
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| _balances[owner] -= 1; | ||
| delete _owners[tokenId]; | ||
| delete _tokenURIs[tokenId]; | ||
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| emit Revoke(owner, tokenId); | ||
| } | ||
| } | ||
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