Contract Overview
Latest 25 from a total of 2396474 transactions
Contract Name:
Aliana
Compiler Version
v0.5.5+commit.47a71e8f
pragma solidity ^0.5.0; /** * @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); }
pragma solidity ^0.5.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. Does not include * the optional functions; to access them see {ERC20Detailed}. */ interface IERC20 { /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by `account`. */ function balanceOf(address account) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `recipient`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address recipient, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: Beware that changing an allowance with this method brings the risk * that someone may use both the old and the new allowance by unfortunate * transaction ordering. One possible solution to mitigate this race * condition is to first reduce the spender's allowance to 0 and set the * desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `sender` to `recipient` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom(address sender, address recipient, uint256 amount) external returns (bool); /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); }
pragma solidity ^0.5.0; import "./IERC20.sol"; import "../../math/SafeMath.sol"; import "../../utils/Address.sol"; /** * @title SafeERC20 * @dev Wrappers around ERC20 operations that throw on failure (when the token * contract returns false). Tokens that return no value (and instead revert or * throw on failure) are also supported, non-reverting calls are assumed to be * successful. * To use this library you can add a `using SafeERC20 for ERC20;` statement to your contract, * which allows you to call the safe operations as `token.safeTransfer(...)`, etc. */ library SafeERC20 { using SafeMath for uint256; using Address for address; function safeTransfer(IERC20 token, address to, uint256 value) internal { callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value)); } function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal { callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value)); } function safeApprove(IERC20 token, address spender, uint256 value) internal { // safeApprove should only be called when setting an initial allowance, // or when resetting it to zero. To increase and decrease it, use // 'safeIncreaseAllowance' and 'safeDecreaseAllowance' // solhint-disable-next-line max-line-length require((value == 0) || (token.allowance(address(this), spender) == 0), "SafeERC20: approve from non-zero to non-zero allowance" ); callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value)); } function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal { uint256 newAllowance = token.allowance(address(this), spender).add(value); callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal { uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero"); callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } /** * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement * on the return value: the return value is optional (but if data is returned, it must not be false). * @param token The token targeted by the call. * @param data The call data (encoded using abi.encode or one of its variants). */ function callOptionalReturn(IERC20 token, bytes memory data) private { // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since // we're implementing it ourselves. // A Solidity high level call has three parts: // 1. The target address is checked to verify it contains contract code // 2. The call itself is made, and success asserted // 3. The return value is decoded, which in turn checks the size of the returned data. // solhint-disable-next-line max-line-length require(address(token).isContract(), "SafeERC20: call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = address(token).call(data); require(success, "SafeERC20: low-level call failed"); if (returndata.length > 0) { // Return data is optional // solhint-disable-next-line max-line-length require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed"); } } }
pragma solidity ^0.5.0; import "./IERC721.sol"; /** * @title ERC-721 Non-Fungible Token Standard, optional metadata extension * @dev See https://eips.ethereum.org/EIPS/eip-721 */ contract IERC721Metadata is IERC721 { function name() external view returns (string memory); function symbol() external view returns (string memory); function tokenURI(uint256 tokenId) external view returns (string memory); }
pragma solidity ^0.5.0; import "@openzeppelin/contracts/token/ERC721/ERC721Full.sol"; import "./IGeneScience.sol"; import "./GFAccessControl.sol"; import "./ISaleClockAuction.sol"; /// @title Base contract for GameAlianas. Holds all common structs, events and base variables. /// @dev See the AlianaCore contract documentation to understand how the various contract facets are arranged. contract AlianaBase is GFAccessControl, ERC721Full { function transferFrom( address from, address to, uint256 tokenId ) public whenNotPaused { super.transferFrom(from, to, tokenId); } function safeTransferFrom( address from, address to, uint256 tokenId ) public whenNotPaused { super.safeTransferFrom(from, to, tokenId); } function safeTransferFrom( address from, address to, uint256 tokenId, bytes memory _data ) public whenNotPaused { super.safeTransferFrom(from, to, tokenId, _data); } /// @dev The address of the sibling contract that is used to implement the sooper-sekret /// genetic combination algorithm. IGeneScience internal geneScience; /// @dev Update the address of the genetic contract, can only be called by the CEO. /// @param _address An address of a GeneScience contract instance to be used from this point forward. function setGeneScienceAddress(IGeneScience _address) public onlyCEO { require(_address.isGeneScience(), "Aliana: not gene"); // Set the new contract address geneScience = _address; } function getGeneScienceAddress() external view onlyCLevelOrWhitelisted returns (address) { return address(geneScience); } function isAliana() external pure returns (bool) { return true; } // Initializing an ERC-721 Token named 'Vipers' with a symbol 'VPR' constructor() public ERC721Full("Game Fantasy Alianas", "GFA") {} /*** DATA TYPES ***/ /// @dev The main Aliana struct. Every cat in GameAlianas is represented by a copy /// of this structure, so great care was taken to ensure that it fits neatly into /// exactly two 256-bit words. Note that the order of the members in this structure /// is important because of the byte-packing rules used by Ethereum. /// Ref: http://solidity.readthedocs.io/en/develop/miscellaneous.html struct Aliana { // The Aliana's genetic code is packed into these 256-bits, the format is // sooper-sekret! A cat's genes never change. uint256 genes; // The timestamp from the block when this cat came into existence. uint64 birthTime; // The ID of the parents of this aliana, set to 0 for gen0 cats. // Note that using 32-bit unsigned integers limits us to a "mere" // 4 billion cats. This number might seem small until you realize // that Ethereum currently has a limit of about 500 million // transactions per year! So, this definitely won't be a problem // for several years (even as Ethereum learns to scale). uint64 matronId; uint64 sireId; } /*** STORAGE ***/ /// @dev An array containing the Aliana struct for all Kitties in existence. The ID /// of each cat is actually an index into this array. Aliana[] public alianas; /// @dev An internal method that creates a new aliana and stores it. This /// method doesn't do any checking and should only be called when the /// input data is known to be valid. Will generate both a Birth event /// and a Transfer event. /// @param _matronId The aliana ID of the matron of this cat (zero for gen0) /// @param _sireId The aliana ID of the sire of this cat (zero for gen0) /// @param _genes The aliana's genetic code. /// @param _owner The inital owner of this cat, must be non-zero (except for the unAliana, ID 0) function _createAliana( uint256 _matronId, uint256 _sireId, uint256 _genes, address _owner ) internal returns (uint256) { require( geneScience.isValid(int256(alianas.length), _genes), "Aliana: genes isn't valid" ); Aliana memory _aliana = Aliana({ genes: _genes, birthTime: uint64(now), matronId: uint64(_matronId), sireId: uint64(_sireId) }); uint256 newKittenId = alianas.push(_aliana) - 1; // This will assign ownership, and also emit the Transfer event as // per ERC721 draft super._mint(_owner, newKittenId); return newKittenId; } /// @notice Returns all the relevant information about a specific aliana. /// @param _id The ID of the aliana of interest. function getAliana(uint256 _id) external view returns ( uint256 birthTime, uint256 matronId, uint256 sireId, uint256 genes, uint256 lpLabor ) { Aliana storage kit = alianas[_id]; birthTime = uint256(kit.birthTime); matronId = uint256(kit.matronId); sireId = uint256(kit.sireId); genes = kit.genes; lpLabor = uint64(geneScience.geneLpLabor(int256(_id), kit.genes)); } }
pragma solidity ^0.5.0; /// @title SEKRETOOOO contract IGeneScience { /// @dev simply a boolean to indicate this is the contract we expect to be function isGeneScience() public pure returns (bool); /// @dev given genes of kitten 1 & 2, return a genetic combination - may have a random factor /// @param _genes1 genes of mom /// @param _genes2 genes of sire /// @param _targetBlock target block /// @return the genes that are supposed to be passed down the child function mixGenes( int256 _id1, int256 _id2, uint256 _genes1, uint256 _genes2, uint256 _targetBlock ) public returns (uint256); function geneLpLabor(int256 _id, uint256 _genes) public pure returns (uint256); function isValid(int256 _id, uint256 _genes) public pure returns (bool); function totalQuality(int256 _id, uint256 _genes) public pure returns (uint256); function getAuctionGene(uint256 _id) public pure returns (uint256); }
pragma solidity ^0.5.0; /// @title SEKRETOOOO contract ISaleClockAuction { /// @dev simply a boolean to indicate this is the contract we expect to be function isAuction() public pure returns (bool); function createAuction( uint256 _tokenId, uint256 _startingPrice, uint256 _endingPrice, uint256 _duration, address _seller ) external; function claimTokens(address token_) public; }
pragma solidity ^0.5.0; /* * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with GSN meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ contract Context { // Empty internal constructor, to prevent people from mistakenly deploying // an instance of this contract, which should be used via inheritance. constructor () internal { } // solhint-disable-previous-line no-empty-blocks function _msgSender() internal view returns (address payable) { return msg.sender; } function _msgData() internal view returns (bytes memory) { this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 return msg.data; } }
pragma solidity ^0.5.0; import "../math/SafeMath.sol"; /** * @title Counters * @author Matt Condon (@shrugs) * @dev Provides counters that can only be incremented or decremented by one. This can be used e.g. to track the number * of elements in a mapping, issuing ERC721 ids, or counting request ids. * * Include with `using Counters for Counters.Counter;` * Since it is not possible to overflow a 256 bit integer with increments of one, `increment` can skip the {SafeMath} * overflow check, thereby saving gas. This does assume however correct usage, in that the underlying `_value` is never * directly accessed. */ library Counters { using SafeMath for uint256; struct Counter { // This variable should never be directly accessed by users of the library: interactions must be restricted to // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add // this feature: see https://github.com/ethereum/solidity/issues/4637 uint256 _value; // default: 0 } function current(Counter storage counter) internal view returns (uint256) { return counter._value; } function increment(Counter storage counter) internal { // The {SafeMath} overflow check can be skipped here, see the comment at the top counter._value += 1; } function decrement(Counter storage counter) internal { counter._value = counter._value.sub(1); } }
pragma solidity ^0.5.0; import "../../GSN/Context.sol"; import "./IERC721.sol"; import "./IERC721Receiver.sol"; import "../../math/SafeMath.sol"; import "../../utils/Address.sol"; import "../../drafts/Counters.sol"; import "../../introspection/ERC165.sol"; /** * @title ERC721 Non-Fungible Token Standard basic implementation * @dev see https://eips.ethereum.org/EIPS/eip-721 */ contract ERC721 is Context, ERC165, IERC721 { using SafeMath for uint256; using Address for address; using Counters for Counters.Counter; // Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))` // which can be also obtained as `IERC721Receiver(0).onERC721Received.selector` bytes4 private constant _ERC721_RECEIVED = 0x150b7a02; // Mapping from token ID to owner mapping (uint256 => address) private _tokenOwner; // Mapping from token ID to approved address mapping (uint256 => address) private _tokenApprovals; // Mapping from owner to number of owned token mapping (address => Counters.Counter) private _ownedTokensCount; // Mapping from owner to operator approvals mapping (address => mapping (address => bool)) private _operatorApprovals; /* * bytes4(keccak256('balanceOf(address)')) == 0x70a08231 * bytes4(keccak256('ownerOf(uint256)')) == 0x6352211e * bytes4(keccak256('approve(address,uint256)')) == 0x095ea7b3 * bytes4(keccak256('getApproved(uint256)')) == 0x081812fc * bytes4(keccak256('setApprovalForAll(address,bool)')) == 0xa22cb465 * bytes4(keccak256('isApprovedForAll(address,address)')) == 0xe985e9c5 * bytes4(keccak256('transferFrom(address,address,uint256)')) == 0x23b872dd * bytes4(keccak256('safeTransferFrom(address,address,uint256)')) == 0x42842e0e * bytes4(keccak256('safeTransferFrom(address,address,uint256,bytes)')) == 0xb88d4fde * * => 0x70a08231 ^ 0x6352211e ^ 0x095ea7b3 ^ 0x081812fc ^ * 0xa22cb465 ^ 0xe985e9c ^ 0x23b872dd ^ 0x42842e0e ^ 0xb88d4fde == 0x80ac58cd */ bytes4 private constant _INTERFACE_ID_ERC721 = 0x80ac58cd; constructor () public { // register the supported interfaces to conform to ERC721 via ERC165 _registerInterface(_INTERFACE_ID_ERC721); } /** * @dev Gets the balance of the specified address. * @param owner address to query the balance of * @return uint256 representing the amount owned by the passed address */ function balanceOf(address owner) public view returns (uint256) { require(owner != address(0), "ERC721: balance query for the zero address"); return _ownedTokensCount[owner].current(); } /** * @dev Gets the owner of the specified token ID. * @param tokenId uint256 ID of the token to query the owner of * @return address currently marked as the owner of the given token ID */ function ownerOf(uint256 tokenId) public view returns (address) { address owner = _tokenOwner[tokenId]; require(owner != address(0), "ERC721: owner query for nonexistent token"); return owner; } /** * @dev Approves another address to transfer the given token ID * The zero address indicates there is no approved address. * There can only be one approved address per token at a given time. * Can only be called by the token owner or an approved operator. * @param to address to be approved for the given token ID * @param tokenId uint256 ID of the token to be approved */ function approve(address to, uint256 tokenId) public { address owner = ownerOf(tokenId); require(to != owner, "ERC721: approval to current owner"); require(_msgSender() == owner || isApprovedForAll(owner, _msgSender()), "ERC721: approve caller is not owner nor approved for all" ); _tokenApprovals[tokenId] = to; emit Approval(owner, to, tokenId); } /** * @dev Gets the approved address for a token ID, or zero if no address set * Reverts if the token ID does not exist. * @param tokenId uint256 ID of the token to query the approval of * @return address currently approved for the given token ID */ function getApproved(uint256 tokenId) public view returns (address) { require(_exists(tokenId), "ERC721: approved query for nonexistent token"); return _tokenApprovals[tokenId]; } /** * @dev Sets or unsets the approval of a given operator * An operator is allowed to transfer all tokens of the sender on their behalf. * @param to operator address to set the approval * @param approved representing the status of the approval to be set */ function setApprovalForAll(address to, bool approved) public { require(to != _msgSender(), "ERC721: approve to caller"); _operatorApprovals[_msgSender()][to] = approved; emit ApprovalForAll(_msgSender(), to, approved); } /** * @dev Tells whether an operator is approved by a given owner. * @param owner owner address which you want to query the approval of * @param operator operator address which you want to query the approval of * @return bool whether the given operator is approved by the given owner */ function isApprovedForAll(address owner, address operator) public view returns (bool) { return _operatorApprovals[owner][operator]; } /** * @dev Transfers the ownership of a given token ID to another address. * Usage of this method is discouraged, use {safeTransferFrom} whenever possible. * Requires the msg.sender to be the owner, approved, or operator. * @param from current owner of the token * @param to address to receive the ownership of the given token ID * @param tokenId uint256 ID of the token to be transferred */ function transferFrom(address from, address to, uint256 tokenId) public { //solhint-disable-next-line max-line-length require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved"); _transferFrom(from, to, tokenId); } /** * @dev Safely transfers the ownership of a given token ID to another address * If the target address is a contract, it must implement {IERC721Receiver-onERC721Received}, * which is called upon a safe transfer, and return the magic value * `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`; otherwise, * the transfer is reverted. * Requires the msg.sender to be the owner, approved, or operator * @param from current owner of the token * @param to address to receive the ownership of the given token ID * @param tokenId uint256 ID of the token to be transferred */ function safeTransferFrom(address from, address to, uint256 tokenId) public { safeTransferFrom(from, to, tokenId, ""); } /** * @dev Safely transfers the ownership of a given token ID to another address * If the target address is a contract, it must implement {IERC721Receiver-onERC721Received}, * which is called upon a safe transfer, and return the magic value * `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`; otherwise, * the transfer is reverted. * Requires the _msgSender() to be the owner, approved, or operator * @param from current owner of the token * @param to address to receive the ownership of the given token ID * @param tokenId uint256 ID of the token to be transferred * @param _data bytes data to send along with a safe transfer check */ function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory _data) public { require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved"); _safeTransferFrom(from, to, tokenId, _data); } /** * @dev Safely transfers the ownership of a given token ID to another address * If the target address is a contract, it must implement `onERC721Received`, * which is called upon a safe transfer, and return the magic value * `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`; otherwise, * the transfer is reverted. * Requires the msg.sender to be the owner, approved, or operator * @param from current owner of the token * @param to address to receive the ownership of the given token ID * @param tokenId uint256 ID of the token to be transferred * @param _data bytes data to send along with a safe transfer check */ function _safeTransferFrom(address from, address to, uint256 tokenId, bytes memory _data) internal { _transferFrom(from, to, tokenId); require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer"); } /** * @dev Returns whether the specified token exists. * @param tokenId uint256 ID of the token to query the existence of * @return bool whether the token exists */ function _exists(uint256 tokenId) internal view returns (bool) { address owner = _tokenOwner[tokenId]; return owner != address(0); } /** * @dev Returns whether the given spender can transfer a given token ID. * @param spender address of the spender to query * @param tokenId uint256 ID of the token to be transferred * @return bool whether the msg.sender is approved for the given token ID, * is an operator of the owner, or is the owner of the token */ function _isApprovedOrOwner(address spender, uint256 tokenId) internal view returns (bool) { require(_exists(tokenId), "ERC721: operator query for nonexistent token"); address owner = ownerOf(tokenId); return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender)); } /** * @dev Internal function to safely mint a new token. * Reverts if the given token ID already exists. * If the target address is a contract, it must implement `onERC721Received`, * which is called upon a safe transfer, and return the magic value * `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`; otherwise, * the transfer is reverted. * @param to The address that will own the minted token * @param tokenId uint256 ID of the token to be minted */ function _safeMint(address to, uint256 tokenId) internal { _safeMint(to, tokenId, ""); } /** * @dev Internal function to safely mint a new token. * Reverts if the given token ID already exists. * If the target address is a contract, it must implement `onERC721Received`, * which is called upon a safe transfer, and return the magic value * `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`; otherwise, * the transfer is reverted. * @param to The address that will own the minted token * @param tokenId uint256 ID of the token to be minted * @param _data bytes data to send along with a safe transfer check */ function _safeMint(address to, uint256 tokenId, bytes memory _data) internal { _mint(to, tokenId); require(_checkOnERC721Received(address(0), to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer"); } /** * @dev Internal function to mint a new token. * Reverts if the given token ID already exists. * @param to The address that will own the minted token * @param tokenId uint256 ID of the token to be minted */ function _mint(address to, uint256 tokenId) internal { require(to != address(0), "ERC721: mint to the zero address"); require(!_exists(tokenId), "ERC721: token already minted"); _tokenOwner[tokenId] = to; _ownedTokensCount[to].increment(); emit Transfer(address(0), to, tokenId); } /** * @dev Internal function to burn a specific token. * Reverts if the token does not exist. * Deprecated, use {_burn} instead. * @param owner owner of the token to burn * @param tokenId uint256 ID of the token being burned */ function _burn(address owner, uint256 tokenId) internal { require(ownerOf(tokenId) == owner, "ERC721: burn of token that is not own"); _clearApproval(tokenId); _ownedTokensCount[owner].decrement(); _tokenOwner[tokenId] = address(0); emit Transfer(owner, address(0), tokenId); } /** * @dev Internal function to burn a specific token. * Reverts if the token does not exist. * @param tokenId uint256 ID of the token being burned */ function _burn(uint256 tokenId) internal { _burn(ownerOf(tokenId), tokenId); } /** * @dev Internal function to transfer ownership of a given token ID to another address. * As opposed to {transferFrom}, this imposes no restrictions on msg.sender. * @param from current owner of the token * @param to address to receive the ownership of the given token ID * @param tokenId uint256 ID of the token to be transferred */ function _transferFrom(address from, address to, uint256 tokenId) internal { require(ownerOf(tokenId) == from, "ERC721: transfer of token that is not own"); require(to != address(0), "ERC721: transfer to the zero address"); _clearApproval(tokenId); _ownedTokensCount[from].decrement(); _ownedTokensCount[to].increment(); _tokenOwner[tokenId] = to; emit Transfer(from, to, tokenId); } /** * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address. * The call is not executed if the target address is not a contract. * * This is an internal detail of the `ERC721` contract and its use is deprecated. * @param from address representing the previous owner of the given token ID * @param to target address that will receive the tokens * @param tokenId uint256 ID of the token to be transferred * @param _data bytes optional data to send along with the call * @return bool whether the call correctly returned the expected magic value */ function _checkOnERC721Received(address from, address to, uint256 tokenId, bytes memory _data) internal returns (bool) { if (!to.isContract()) { return true; } // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = to.call(abi.encodeWithSelector( IERC721Receiver(to).onERC721Received.selector, _msgSender(), from, tokenId, _data )); if (!success) { if (returndata.length > 0) { // solhint-disable-next-line no-inline-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert("ERC721: transfer to non ERC721Receiver implementer"); } } else { bytes4 retval = abi.decode(returndata, (bytes4)); return (retval == _ERC721_RECEIVED); } } /** * @dev Private function to clear current approval of a given token ID. * @param tokenId uint256 ID of the token to be transferred */ function _clearApproval(uint256 tokenId) private { if (_tokenApprovals[tokenId] != address(0)) { _tokenApprovals[tokenId] = address(0); } } }
pragma solidity ^0.5.0; import "./ERC721.sol"; import "./ERC721Enumerable.sol"; import "./ERC721Metadata.sol"; /** * @title Full ERC721 Token * @dev This implementation includes all the required and some optional functionality of the ERC721 standard * Moreover, it includes approve all functionality using operator terminology. * * See https://eips.ethereum.org/EIPS/eip-721 */ contract ERC721Full is ERC721, ERC721Enumerable, ERC721Metadata { constructor (string memory name, string memory symbol) public ERC721Metadata(name, symbol) { // solhint-disable-previous-line no-empty-blocks } }
pragma solidity ^0.5.0; import "../../GSN/Context.sol"; import "./ERC721.sol"; import "./IERC721Metadata.sol"; import "../../introspection/ERC165.sol"; contract ERC721Metadata is Context, ERC165, ERC721, IERC721Metadata { // Token name string private _name; // Token symbol string private _symbol; // Base URI string private _baseURI; // Optional mapping for token URIs mapping(uint256 => string) private _tokenURIs; /* * bytes4(keccak256('name()')) == 0x06fdde03 * bytes4(keccak256('symbol()')) == 0x95d89b41 * bytes4(keccak256('tokenURI(uint256)')) == 0xc87b56dd * * => 0x06fdde03 ^ 0x95d89b41 ^ 0xc87b56dd == 0x5b5e139f */ bytes4 private constant _INTERFACE_ID_ERC721_METADATA = 0x5b5e139f; /** * @dev Constructor function */ constructor (string memory name, string memory symbol) public { _name = name; _symbol = symbol; // register the supported interfaces to conform to ERC721 via ERC165 _registerInterface(_INTERFACE_ID_ERC721_METADATA); } /** * @dev Gets the token name. * @return string representing the token name */ function name() external view returns (string memory) { return _name; } /** * @dev Gets the token symbol. * @return string representing the token symbol */ function symbol() external view returns (string memory) { return _symbol; } /** * @dev Returns the URI for a given token ID. May return an empty string. * * If the token's URI is non-empty and a base URI was set (via * {_setBaseURI}), it will be added to the token ID's URI as a prefix. * * Reverts if the token ID does not exist. */ function tokenURI(uint256 tokenId) external view returns (string memory) { require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token"); string memory _tokenURI = _tokenURIs[tokenId]; // Even if there is a base URI, it is only appended to non-empty token-specific URIs if (bytes(_tokenURI).length == 0) { return ""; } else { // abi.encodePacked is being used to concatenate strings return string(abi.encodePacked(_baseURI, _tokenURI)); } } /** * @dev Internal function to set the token URI for a given token. * * Reverts if the token ID does not exist. * * TIP: if all token IDs share a prefix (e.g. if your URIs look like * `http://api.myproject.com/token/<id>`), use {_setBaseURI} to store * it and save gas. */ function _setTokenURI(uint256 tokenId, string memory _tokenURI) internal { require(_exists(tokenId), "ERC721Metadata: URI set of nonexistent token"); _tokenURIs[tokenId] = _tokenURI; } /** * @dev Internal function to set the base URI for all token IDs. It is * automatically added as a prefix to the value returned in {tokenURI}. * * _Available since v2.5.0._ */ function _setBaseURI(string memory baseURI) internal { _baseURI = baseURI; } /** * @dev Returns the base URI set via {_setBaseURI}. This will be * automatically added as a preffix in {tokenURI} to each token's URI, when * they are non-empty. * * _Available since v2.5.0._ */ function baseURI() external view returns (string memory) { return _baseURI; } /** * @dev Internal function to burn a specific token. * Reverts if the token does not exist. * Deprecated, use _burn(uint256) instead. * @param owner owner of the token to burn * @param tokenId uint256 ID of the token being burned by the msg.sender */ function _burn(address owner, uint256 tokenId) internal { super._burn(owner, tokenId); // Clear metadata (if any) if (bytes(_tokenURIs[tokenId]).length != 0) { delete _tokenURIs[tokenId]; } } }
pragma solidity ^0.5.0; import "./AlianaBase.sol"; import "../token/IApproveAndCallFallBack.sol"; /// @title The facet of the GameAlianas core contract that manages ownership, ERC-721 (draft) compliant. /// @dev Ref: https://github.com/ethereum/EIPs/issues/721 /// See the AlianaCore contract documentation to understand how the various contract facets are arranged. contract AlianaOwnership is AlianaBase { /// @notice Returns the total number of Kitties currently in existence. function totalAlianaSupply() public view returns (uint256) { return alianas.length; } /// @notice Returns a list of all Aliana IDs assigned to an address. /// @param _owner The owner whose Kitties we are interested in. /// @dev This method MUST NEVER be called by smart contract code. First, it's fairly /// expensive (it walks the entire Aliana array looking for cats belonging to owner), /// but it also returns a dynamic array, which is only supported for web3 calls, and /// not contract-to-contract calls. function tokensOfOwner(address _owner) external view returns (uint256[] memory ownerTokens) { return super._tokensOfOwner(_owner); } /// @notice `msg.sender` approves `spender_` to send `tokenId_` tokens on /// its behalf, and then a function is triggered in the contract that is /// being approved, `spender_`. This allows users to use their tokens to /// interact with contracts in one function call instead of two /// @param spender_ The address of the contract able to transfer the tokens /// @param tokenId_ The id of tokens to be approved for transfer /// @return True if the function call was successful function approveAndCall( address spender_, uint256 tokenId_, bytes memory extraData_ ) public returns (bool success) { approve(spender_, tokenId_); IApproveAndCallFallBack(spender_).receiveApproval( msg.sender, tokenId_, address(this), extraData_ ); return true; } function setApprovalForAllAndCall( address spender_, bool approved_, bytes memory extraData_ ) public returns (bool success) { setApprovalForAll(spender_, approved_); IApproveAndCallFallBack(spender_).receiveApproval( msg.sender, uint256(-1), address(this), extraData_ ); return true; } }
pragma solidity ^0.5.5; /** * @dev Collection of functions related to the address type */ library Address { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * ==== */ function isContract(address account) internal view returns (bool) { // According to EIP-1052, 0x0 is the value returned for not-yet created accounts // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned // for accounts without code, i.e. `keccak256('')` bytes32 codehash; bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470; // solhint-disable-next-line no-inline-assembly assembly { codehash := extcodehash(account) } return (codehash != accountHash && codehash != 0x0); } /** * @dev Converts an `address` into `address payable`. Note that this is * simply a type cast: the actual underlying value is not changed. * * _Available since v2.4.0._ */ function toPayable(address account) internal pure returns (address payable) { return address(uint160(account)); } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. * * _Available since v2.4.0._ */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); // solhint-disable-next-line avoid-call-value (bool success, ) = recipient.call.value(amount)(""); require(success, "Address: unable to send value, recipient may have reverted"); } }
pragma solidity ^0.5.0; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import "@openzeppelin/contracts/token/ERC721/IERC721.sol"; /// @title A facet of AlianaCore that manages special access privileges. /// @dev See the AlianaCore contract documentation to understand how the various contract facets are arranged. contract GFAccessControl { mapping(address => bool) public whitelist; event WhitelistedAddressAdded(address addr); event WhitelistedAddressRemoved(address addr); /** * @dev Throws if called by any account that's not whitelisted. */ modifier onlyWhitelisted() { require(whitelist[msg.sender], "not whitelisted"); _; } /** * @dev add an address to the whitelist * @param addr address * @return true if the address was added to the whitelist, false if the address was already in the whitelist */ function addAddressToWhitelist(address addr) external onlyCEO returns (bool success) { return _addAddressToWhitelist(addr); } /** * @dev add an address to the whitelist * @param addr address * @return true if the address was added to the whitelist, false if the address was already in the whitelist */ function _addAddressToWhitelist(address addr) private onlyCEO returns (bool success) { if (!whitelist[addr]) { whitelist[addr] = true; emit WhitelistedAddressAdded(addr); success = true; } } /** * @dev add addresses to the whitelist * @param addrs addresses * @return true if at least one address was added to the whitelist, * false if all addresses were already in the whitelist */ function addAddressesToWhitelist(address[] calldata addrs) external onlyCEO returns (bool success) { for (uint256 i = 0; i < addrs.length; i++) { if (_addAddressToWhitelist(addrs[i])) { success = true; } } } /** * @dev remove an address from the whitelist * @param addr address * @return true if the address was removed from the whitelist, * false if the address wasn't in the whitelist in the first place */ function removeAddressFromWhitelist(address addr) external onlyCEO returns (bool success) { return _removeAddressFromWhitelist(addr); } /** * @dev remove an address from the whitelist * @param addr address * @return true if the address was removed from the whitelist, * false if the address wasn't in the whitelist in the first place */ function _removeAddressFromWhitelist(address addr) private onlyCEO returns (bool success) { if (whitelist[addr]) { whitelist[addr] = false; emit WhitelistedAddressRemoved(addr); success = true; } } /** * @dev remove addresses from the whitelist * @param addrs addresses * @return true if at least one address was removed from the whitelist, * false if all addresses weren't in the whitelist in the first place */ function removeAddressesFromWhitelist(address[] calldata addrs) external onlyCEO returns (bool success) { for (uint256 i = 0; i < addrs.length; i++) { if (_removeAddressFromWhitelist(addrs[i])) { success = true; } } } // This facet controls access control for GameAlianas. There are four roles managed here: // // - The CEO: The CEO can reassign other roles and change the addresses of our dependent smart // contracts. It is also the only role that can unpause the smart contract. It is initially // set to the address that created the smart contract in the AlianaCore constructor. // // - The CFO: The CFO can withdraw funds from AlianaCore and its auction contracts. // // - The COO: The COO can release gen0 alianas to auction, and mint promo cats. // // It should be noted that these roles are distinct without overlap in their access abilities, the // abilities listed for each role above are exhaustive. In particular, while the CEO can assign any // address to any role, the CEO address itself doesn't have the ability to act in those roles. This // restriction is intentional so that we aren't tempted to use the CEO address frequently out of // convenience. The less we use an address, the less likely it is that we somehow compromise the // account. /// @dev Emited when contract is upgraded - See README.md for updgrade plan event ContractUpgrade(address newContract); // The addresses of the accounts (or contracts) that can execute actions within each roles. address public ceoAddress; address public candidateCEOAddress; address public cfoAddress; address public cooAddress; event SetCandidateCEO(address addr); event AcceptCEO(address addr); event SetCFO(address addr); event SetCOO(address addr); event Pause(address operator); event Unpause(address operator); // @dev Keeps track whether the contract is paused. When that is true, most actions are blocked bool public paused = false; /** * @dev The Ownable constructor sets the original `ceoAddress` of the contract to the sender * account. */ constructor() public { ceoAddress = msg.sender; emit AcceptCEO(ceoAddress); } /// @dev Access modifier for CEO-only functionality modifier onlyCEO() { require(msg.sender == ceoAddress, "not ceo"); _; } /// @dev Access modifier for CFO-only functionality modifier onlyCFO() { require(msg.sender == cfoAddress, "not cfo"); _; } /// @dev Access modifier for COO-only functionality modifier onlyCOO() { require(msg.sender == cooAddress, "not coo"); _; } modifier onlyCLevel() { require( msg.sender == cooAddress || msg.sender == ceoAddress || msg.sender == cfoAddress, "not c level" ); _; } modifier onlyCLevelOrWhitelisted() { require( msg.sender == cooAddress || msg.sender == ceoAddress || msg.sender == cfoAddress || whitelist[msg.sender], "not c level or whitelisted" ); _; } /// @dev Assigns a new address to act as the CEO. Only available to the current CEO. /// @param _candidateCEO The address of the new CEO function setCandidateCEO(address _candidateCEO) external onlyCEO { require(_candidateCEO != address(0), "addr can't be 0"); candidateCEOAddress = _candidateCEO; emit SetCandidateCEO(candidateCEOAddress); } /// @dev Accept CEO invite. function acceptCEO() external { require(msg.sender == candidateCEOAddress, "you are not the candidate"); ceoAddress = candidateCEOAddress; emit AcceptCEO(ceoAddress); } /// @dev Assigns a new address to act as the CFO. Only available to the current CEO. /// @param _newCFO The address of the new CFO function setCFO(address _newCFO) external onlyCEO { require(_newCFO != address(0), "addr can't be 0"); cfoAddress = _newCFO; emit SetCFO(cfoAddress); } /// @dev Assigns a new address to act as the COO. Only available to the current CEO. /// @param _newCOO The address of the new COO function setCOO(address _newCOO) external onlyCEO { require(_newCOO != address(0), "addr can't be 0"); cooAddress = _newCOO; emit SetCOO(cooAddress); } /*** Pausable functionality adapted from OpenZeppelin ***/ /// @dev Modifier to allow actions only when the contract IS NOT paused modifier whenNotPaused() { require(!paused, "paused"); _; } /// @dev Modifier to allow actions only when the contract IS paused modifier whenPaused() { require(paused, "not paused"); _; } /// @dev Called by any "C-level" role to pause the contract. Used only when /// a bug or exploit is detected and we need to limit damage. function pause() external onlyCEO whenNotPaused { paused = true; emit Pause(msg.sender); } /// @dev Unpauses the smart contract. Can only be called by the CEO, since /// one reason we may pause the contract is when CFO or COO accounts are /// compromised. /// @notice This is public rather than external so it can be called by /// derived contracts. function unpause() public onlyCEO whenPaused { // can't unpause if contract was upgraded paused = false; emit Unpause(msg.sender); } // Set in case the core contract is broken and an upgrade is required address public newContractAddress; /// @dev Used to mark the smart contract as upgraded, in case there is a serious /// breaking bug. This method does nothing but keep track of the new contract and /// emit a message indicating that the new address is set. It's up to clients of this /// contract to update to the new contract address in that case. (This contract will /// be paused indefinitely if such an upgrade takes place.) /// @param _v2Address new address function setNewAddress(address _v2Address) external onlyCEO whenPaused { // See README.md for updgrade plan newContractAddress = _v2Address; emit ContractUpgrade(_v2Address); } ////////// // Safety Methods ////////// /// @notice This method can be used by the owner to extract mistakenly /// sent tokens to this contract. /// @param token_ The address of the token contract that you want to recover /// set to 0 in case you want to extract ether. function claimTokens(address token_) external onlyCEO { if (token_ == address(0)) { address(msg.sender).transfer(address(this).balance); return; } IERC20 token = IERC20(token_); uint256 balance = token.balanceOf(address(this)); token.transfer(address(msg.sender), balance); emit ClaimedTokens(token_, address(msg.sender), balance); } function withdrawTokens( IERC20 token_, address to_, uint256 amount_ ) external onlyCEO { assert(token_.transfer(to_, amount_)); emit WithdrawTokens(address(token_), address(msg.sender), to_, amount_); } //////////////// // Events //////////////// event ClaimedTokens( address indexed token_, address indexed controller_, uint256 amount_ ); event WithdrawTokens( address indexed token_, address indexed controller_, address indexed to_, uint256 amount_ ); }
pragma solidity ^0.5.0; contract IApproveAndCallFallBack { function receiveApproval( address from, uint256 amount_, address token_, bytes memory data_ ) public; }
pragma solidity ^0.5.0; import "./IERC721.sol"; /** * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension * @dev See https://eips.ethereum.org/EIPS/eip-721 */ contract IERC721Enumerable is IERC721 { function totalSupply() public view returns (uint256); function tokenOfOwnerByIndex(address owner, uint256 index) public view returns (uint256 tokenId); function tokenByIndex(uint256 index) public view returns (uint256); }
pragma solidity ^0.5.0; import "./aliana/AlianaOwnership.sol"; import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol"; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import "./aliana/IGeneScience.sol"; /// @title A facet of AlianaCore that manages Aliana siring, gestation, and birth. /// @dev See the AlianaCore contract documentation to understand how the various contract facets are arranged. contract Aliana is AlianaOwnership { constructor(IGeneScience _geneAddr) public { require(_geneAddr.isGeneScience(), "Aliana: isGeneScience false"); setGeneScienceAddress(_geneAddr); require( _createAliana(0, 0, 0, address(this)) == 0, "Aliana: card #0 must be my own" ); } /// @notice Have a pregnant Aliana give birth! /// @param _matronId A Aliana ready to give birth. /// @return The Aliana ID of the new kitten. /// @dev Looks at a given Aliana and, if pregnant and if the gestation period has passed, /// combines the genes of the two parents to create a new kitten. The new Aliana is assigned /// to the current owner of the matron. Upon successful completion, both the matron and the /// new kitten will be ready to breed again. Note that anyone can call this function (if they /// are willing to pay the gas!), but the new kitten always goes to the mother's owner. function mix(uint256 _matronId, uint256 _sireId) external whenNotPaused returns (uint256) { require( _matronId != _sireId, "Aliana: only different aliana can be merged" ); require(ownerOf(_matronId) == msg.sender, "Aliana: must be the owner"); require(ownerOf(_sireId) == msg.sender, "Aliana: must be the owner"); // Grab a reference to the matron in storage. Aliana storage matron = alianas[_matronId]; Aliana storage sire = alianas[_sireId]; // Check that the matron is a valid cat. require(matron.birthTime != 0, "Aliana: matron birthTime not valid"); // Check that the matron is a valid cat. require(sire.birthTime != 0, "Aliana: sire birthTime not valid"); uint256 totalCats = totalAlianaSupply(); // Call the sooper-sekret gene mixing operation. uint256 childGenes = geneScience.mixGenes( int256(_matronId), int256(_sireId), matron.genes, sire.genes, totalCats ); _burn(msg.sender, _matronId); _burn(msg.sender, _sireId); // Make the new kitten! uint256 kittenId = _createAliana( _matronId, _sireId, childGenes, msg.sender ); emit Mix(msg.sender, _matronId, _sireId, kittenId); // return the new kitten's ID return kittenId; } function burn(uint256 _tokenID) external { require(ownerOf(_tokenID) == msg.sender, "Aliana: must be the owner"); _burn(msg.sender, _tokenID); } function geneLpLabor(int256 _id, uint256 _gene) public view returns (uint256) { return geneScience.geneLpLabor(_id, _gene); } function geneLpLabors(int256[] calldata _ids, uint256[] calldata _genes) external view returns (uint256[] memory) { uint256[] memory res = new uint256[](_genes.length); for (uint256 i = 0; i < _genes.length; i++) { res[i] = geneScience.geneLpLabor(_ids[i], _genes[i]); } return res; } /// @dev we can create Official alianas, up to a limit. Only callable by Official contract /// @param _genes the encoded genes of the kitten to be created, any value is accepted /// @param _owner the future owner of the created alianas. Default to contract COO function createOfficialAliana(uint256 _genes, address _owner) external onlyWhitelisted returns (uint256) { return _createAliana(0, 0, _genes, _owner); } /// @dev we can create Official alianas, up to a limit. Only callable by Official contract /// @param _genes the encoded genes of the kitten to be created, any value is accepted /// @param _owner the future owner of the created alianas. Default to contract COO function createOfficialAliana( uint256 _matronId, uint256 _sireId, uint256 _genes, address _owner ) external onlyWhitelisted returns (uint256) { return _createAliana(_matronId, _sireId, _genes, _owner); } /// @dev we can create promo alianas, up to a limit. Only callable by COO /// @param _genes the encoded genes of the kitten to be created, any value is accepted /// @param _owner the future owner of the created alianas. Default to contract COO function createPromoAliana(uint256 _genes, address _owner) external onlyCLevel returns (uint256) { address alianaOwner = _owner; if (alianaOwner == address(0)) { alianaOwner = msg.sender; } return _createAliana(0, 0, _genes, alianaOwner); } event Mix( address indexed src, uint256 indexed matronId, uint256 indexed sireId, uint256 kittenId ); }
pragma solidity ^0.5.0; /** * @dev Wrappers over Solidity's arithmetic operations with added overflow * checks. * * Arithmetic operations in Solidity wrap on overflow. This can easily result * in bugs, because programmers usually assume that an overflow raises an * error, which is the standard behavior in high level programming languages. * `SafeMath` restores this intuition by reverting the transaction when an * operation overflows. * * Using this library instead of the unchecked operations eliminates an entire * class of bugs, so it's recommended to use it always. */ library SafeMath { /** * @dev Returns the addition of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `+` operator. * * Requirements: * - Addition cannot overflow. */ function add(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; require(c >= a, "SafeMath: addition overflow"); return c; } /** * @dev Returns the subtraction of two unsigned integers, reverting on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b) internal pure returns (uint256) { return sub(a, b, "SafeMath: subtraction overflow"); } /** * @dev Returns the subtraction of two unsigned integers, reverting with custom message on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * - Subtraction cannot overflow. * * _Available since v2.4.0._ */ function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b <= a, errorMessage); uint256 c = a - b; return c; } /** * @dev Returns the multiplication of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `*` operator. * * Requirements: * - Multiplication cannot overflow. */ function mul(uint256 a, uint256 b) internal pure returns (uint256) { // Gas optimization: this is cheaper than requiring 'a' not being zero, but the // benefit is lost if 'b' is also tested. // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522 if (a == 0) { return 0; } uint256 c = a * b; require(c / a == b, "SafeMath: multiplication overflow"); return c; } /** * @dev Returns the integer division of two unsigned integers. Reverts on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * - The divisor cannot be zero. */ function div(uint256 a, uint256 b) internal pure returns (uint256) { return div(a, b, "SafeMath: division by zero"); } /** * @dev Returns the integer division of two unsigned integers. Reverts with custom message on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * - The divisor cannot be zero. * * _Available since v2.4.0._ */ function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { // Solidity only automatically asserts when dividing by 0 require(b > 0, errorMessage); uint256 c = a / b; // assert(a == b * c + a % b); // There is no case in which this doesn't hold return c; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * Reverts when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b) internal pure returns (uint256) { return mod(a, b, "SafeMath: modulo by zero"); } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * Reverts with custom message when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * - The divisor cannot be zero. * * _Available since v2.4.0._ */ function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b != 0, errorMessage); return a % b; } }
pragma solidity ^0.5.0; import "../../GSN/Context.sol"; import "./IERC721Enumerable.sol"; import "./ERC721.sol"; import "../../introspection/ERC165.sol"; /** * @title ERC-721 Non-Fungible Token with optional enumeration extension logic * @dev See https://eips.ethereum.org/EIPS/eip-721 */ contract ERC721Enumerable is Context, ERC165, ERC721, IERC721Enumerable { // Mapping from owner to list of owned token IDs mapping(address => uint256[]) private _ownedTokens; // Mapping from token ID to index of the owner tokens list mapping(uint256 => uint256) private _ownedTokensIndex; // Array with all token ids, used for enumeration uint256[] private _allTokens; // Mapping from token id to position in the allTokens array mapping(uint256 => uint256) private _allTokensIndex; /* * bytes4(keccak256('totalSupply()')) == 0x18160ddd * bytes4(keccak256('tokenOfOwnerByIndex(address,uint256)')) == 0x2f745c59 * bytes4(keccak256('tokenByIndex(uint256)')) == 0x4f6ccce7 * * => 0x18160ddd ^ 0x2f745c59 ^ 0x4f6ccce7 == 0x780e9d63 */ bytes4 private constant _INTERFACE_ID_ERC721_ENUMERABLE = 0x780e9d63; /** * @dev Constructor function. */ constructor () public { // register the supported interface to conform to ERC721Enumerable via ERC165 _registerInterface(_INTERFACE_ID_ERC721_ENUMERABLE); } /** * @dev Gets the token ID at a given index of the tokens list of the requested owner. * @param owner address owning the tokens list to be accessed * @param index uint256 representing the index to be accessed of the requested tokens list * @return uint256 token ID at the given index of the tokens list owned by the requested address */ function tokenOfOwnerByIndex(address owner, uint256 index) public view returns (uint256) { require(index < balanceOf(owner), "ERC721Enumerable: owner index out of bounds"); return _ownedTokens[owner][index]; } /** * @dev Gets the total amount of tokens stored by the contract. * @return uint256 representing the total amount of tokens */ function totalSupply() public view returns (uint256) { return _allTokens.length; } /** * @dev Gets the token ID at a given index of all the tokens in this contract * Reverts if the index is greater or equal to the total number of tokens. * @param index uint256 representing the index to be accessed of the tokens list * @return uint256 token ID at the given index of the tokens list */ function tokenByIndex(uint256 index) public view returns (uint256) { require(index < totalSupply(), "ERC721Enumerable: global index out of bounds"); return _allTokens[index]; } /** * @dev Internal function to transfer ownership of a given token ID to another address. * As opposed to transferFrom, this imposes no restrictions on msg.sender. * @param from current owner of the token * @param to address to receive the ownership of the given token ID * @param tokenId uint256 ID of the token to be transferred */ function _transferFrom(address from, address to, uint256 tokenId) internal { super._transferFrom(from, to, tokenId); _removeTokenFromOwnerEnumeration(from, tokenId); _addTokenToOwnerEnumeration(to, tokenId); } /** * @dev Internal function to mint a new token. * Reverts if the given token ID already exists. * @param to address the beneficiary that will own the minted token * @param tokenId uint256 ID of the token to be minted */ function _mint(address to, uint256 tokenId) internal { super._mint(to, tokenId); _addTokenToOwnerEnumeration(to, tokenId); _addTokenToAllTokensEnumeration(tokenId); } /** * @dev Internal function to burn a specific token. * Reverts if the token does not exist. * Deprecated, use {ERC721-_burn} instead. * @param owner owner of the token to burn * @param tokenId uint256 ID of the token being burned */ function _burn(address owner, uint256 tokenId) internal { super._burn(owner, tokenId); _removeTokenFromOwnerEnumeration(owner, tokenId); // Since tokenId will be deleted, we can clear its slot in _ownedTokensIndex to trigger a gas refund _ownedTokensIndex[tokenId] = 0; _removeTokenFromAllTokensEnumeration(tokenId); } /** * @dev Gets the list of token IDs of the requested owner. * @param owner address owning the tokens * @return uint256[] List of token IDs owned by the requested address */ function _tokensOfOwner(address owner) internal view returns (uint256[] storage) { return _ownedTokens[owner]; } /** * @dev Private function to add a token to this extension's ownership-tracking data structures. * @param to address representing the new owner of the given token ID * @param tokenId uint256 ID of the token to be added to the tokens list of the given address */ function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private { _ownedTokensIndex[tokenId] = _ownedTokens[to].length; _ownedTokens[to].push(tokenId); } /** * @dev Private function to add a token to this extension's token tracking data structures. * @param tokenId uint256 ID of the token to be added to the tokens list */ function _addTokenToAllTokensEnumeration(uint256 tokenId) private { _allTokensIndex[tokenId] = _allTokens.length; _allTokens.push(tokenId); } /** * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that * while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for * gas optimizations e.g. when performing a transfer operation (avoiding double writes). * This has O(1) time complexity, but alters the order of the _ownedTokens array. * @param from address representing the previous owner of the given token ID * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address */ function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private { // To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and // then delete the last slot (swap and pop). uint256 lastTokenIndex = _ownedTokens[from].length.sub(1); uint256 tokenIndex = _ownedTokensIndex[tokenId]; // When the token to delete is the last token, the swap operation is unnecessary if (tokenIndex != lastTokenIndex) { uint256 lastTokenId = _ownedTokens[from][lastTokenIndex]; _ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token _ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index } // This also deletes the contents at the last position of the array _ownedTokens[from].length--; // Note that _ownedTokensIndex[tokenId] hasn't been cleared: it still points to the old slot (now occupied by // lastTokenId, or just over the end of the array if the token was the last one). } /** * @dev Private function to remove a token from this extension's token tracking data structures. * This has O(1) time complexity, but alters the order of the _allTokens array. * @param tokenId uint256 ID of the token to be removed from the tokens list */ function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private { // To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and // then delete the last slot (swap and pop). uint256 lastTokenIndex = _allTokens.length.sub(1); uint256 tokenIndex = _allTokensIndex[tokenId]; // When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so // rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding // an 'if' statement (like in _removeTokenFromOwnerEnumeration) uint256 lastTokenId = _allTokens[lastTokenIndex]; _allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token _allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index // This also deletes the contents at the last position of the array _allTokens.length--; _allTokensIndex[tokenId] = 0; } }
pragma solidity ^0.5.0; import "../../introspection/IERC165.sol"; /** * @dev Required interface of an ERC721 compliant contract. */ contract IERC721 is IERC165 { event Transfer(address indexed from, address indexed to, uint256 indexed tokenId); event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId); event ApprovalForAll(address indexed owner, address indexed operator, bool approved); /** * @dev Returns the number of NFTs in `owner`'s account. */ function balanceOf(address owner) public view returns (uint256 balance); /** * @dev Returns the owner of the NFT specified by `tokenId`. */ function ownerOf(uint256 tokenId) public view returns (address owner); /** * @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to * another (`to`). * * * * Requirements: * - `from`, `to` cannot be zero. * - `tokenId` must be owned by `from`. * - If the caller is not `from`, it must be have been allowed to move this * NFT by either {approve} or {setApprovalForAll}. */ function safeTransferFrom(address from, address to, uint256 tokenId) public; /** * @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to * another (`to`). * * Requirements: * - If the caller is not `from`, it must be approved to move this NFT by * either {approve} or {setApprovalForAll}. */ function transferFrom(address from, address to, uint256 tokenId) public; function approve(address to, uint256 tokenId) public; function getApproved(uint256 tokenId) public view returns (address operator); function setApprovalForAll(address operator, bool _approved) public; function isApprovedForAll(address owner, address operator) public view returns (bool); function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory data) public; }
pragma solidity ^0.5.0; /** * @title ERC721 token receiver interface * @dev Interface for any contract that wants to support safeTransfers * from ERC721 asset contracts. */ contract IERC721Receiver { /** * @notice Handle the receipt of an NFT * @dev The ERC721 smart contract calls this function on the recipient * after a {IERC721-safeTransferFrom}. This function MUST return the function selector, * otherwise the caller will revert the transaction. The selector to be * returned can be obtained as `this.onERC721Received.selector`. This * function MAY throw to revert and reject the transfer. * Note: the ERC721 contract address is always the message sender. * @param operator The address which called `safeTransferFrom` function * @param from The address which previously owned the token * @param tokenId The NFT identifier which is being transferred * @param data Additional data with no specified format * @return bytes4 `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))` */ function onERC721Received(address operator, address from, uint256 tokenId, bytes memory data) public returns (bytes4); }
pragma solidity ^0.5.0; import "./IERC165.sol"; /** * @dev Implementation of the {IERC165} interface. * * Contracts may inherit from this and call {_registerInterface} to declare * their support of an interface. */ contract ERC165 is IERC165 { /* * bytes4(keccak256('supportsInterface(bytes4)')) == 0x01ffc9a7 */ bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7; /** * @dev Mapping of interface ids to whether or not it's supported. */ mapping(bytes4 => bool) private _supportedInterfaces; constructor () internal { // Derived contracts need only register support for their own interfaces, // we register support for ERC165 itself here _registerInterface(_INTERFACE_ID_ERC165); } /** * @dev See {IERC165-supportsInterface}. * * Time complexity O(1), guaranteed to always use less than 30 000 gas. */ function supportsInterface(bytes4 interfaceId) external view returns (bool) { return _supportedInterfaces[interfaceId]; } /** * @dev Registers the contract as an implementer of the interface defined by * `interfaceId`. Support of the actual ERC165 interface is automatic and * registering its interface id is not required. * * See {IERC165-supportsInterface}. * * Requirements: * * - `interfaceId` cannot be the ERC165 invalid interface (`0xffffffff`). */ function _registerInterface(bytes4 interfaceId) internal { require(interfaceId != 0xffffffff, "ERC165: invalid interface id"); _supportedInterfaces[interfaceId] = true; } }
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Contract Creation Code
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