ERC-721
NFT
Overview
Max Total Supply
804 AETH
Holders
362
Market
Volume (24H)
N/A
Min Price (24H)
N/A
Max Price (24H)
N/A
Other Info
Token Contract
Balance
3 AETHLoading...
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
AetherCore
Compiler Version
v0.4.21+commit.dfe3193c
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity)
/** *Submitted for verification at Etherscan.io on 2018-03-11 */ pragma solidity ^0.4.18; // File: contracts-origin/AetherAccessControl.sol /// @title A facet of AetherCore that manages special access privileges. /// @dev See the AetherCore contract documentation to understand how the various contract facets are arranged. contract AetherAccessControl { // This facet controls access control for Laputa. 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 AetherCore constructor. // // - The CFO: The CFO can withdraw funds from AetherCore and its auction contracts. // // - The COO: The COO can release properties to auction. // // 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 cfoAddress; address public cooAddress; // @dev Keeps track whether the contract is paused. When that is true, most actions are blocked bool public paused = false; /// @dev Access modifier for CEO-only functionality modifier onlyCEO() { require(msg.sender == ceoAddress); _; } /// @dev Access modifier for CFO-only functionality modifier onlyCFO() { require(msg.sender == cfoAddress); _; } /// @dev Access modifier for COO-only functionality modifier onlyCOO() { require(msg.sender == cooAddress); _; } modifier onlyCLevel() { require( msg.sender == cooAddress || msg.sender == ceoAddress || msg.sender == cfoAddress ); _; } /// @dev Assigns a new address to act as the CEO. Only available to the current CEO. /// @param _newCEO The address of the new CEO function setCEO(address _newCEO) public onlyCEO { require(_newCEO != address(0)); ceoAddress = _newCEO; } /// @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) public onlyCEO { require(_newCFO != address(0)); cfoAddress = _newCFO; } /// @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) public onlyCEO { require(_newCOO != address(0)); cooAddress = _newCOO; } function withdrawBalance() external onlyCFO { cfoAddress.transfer(this.balance); } /*** Pausable functionality adapted from OpenZeppelin ***/ /// @dev Modifier to allow actions only when the contract IS NOT paused modifier whenNotPaused() { require(!paused); _; } /// @dev Modifier to allow actions only when the contract IS paused modifier whenPaused { require(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() public onlyCLevel whenNotPaused { paused = true; } /// @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. function unpause() public onlyCEO whenPaused { // can't unpause if contract was upgraded paused = false; } } // File: contracts-origin/AetherBase.sol /// @title Base contract for Aether. Holds all common structs, events and base variables. /// @author Project Aether (https://www.aether.city) /// @dev See the PropertyCore contract documentation to understand how the various contract facets are arranged. contract AetherBase is AetherAccessControl { /*** EVENTS ***/ /// @dev The Construct event is fired whenever a property updates. event Construct ( address indexed owner, uint256 propertyId, PropertyClass class, uint8 x, uint8 y, uint8 z, uint8 dx, uint8 dz, string data ); /// @dev Transfer event as defined in current draft of ERC721. Emitted every /// time a property ownership is assigned. event Transfer( address indexed from, address indexed to, uint256 indexed tokenId ); /*** DATA ***/ enum PropertyClass { DISTRICT, BUILDING, UNIT } /// @dev The main Property struct. Every property in Aether is represented /// by a variant of this structure. struct Property { uint32 parent; PropertyClass class; uint8 x; uint8 y; uint8 z; uint8 dx; uint8 dz; } /*** STORAGE ***/ /// @dev Ensures that property occupies unique part of the universe. bool[100][100][100] public world; /// @dev An array containing the Property struct for all properties in existence. The ID /// of each property is actually an index into this array. Property[] properties; /// @dev An array containing the district addresses in existence. uint256[] districts; /// @dev A measure of world progression. uint256 public progress; /// @dev The fee associated with constructing a unit property. uint256 public unitCreationFee = 0.05 ether; /// @dev Keeps track whether updating data is paused. bool public updateEnabled = true; /// @dev A mapping from property IDs to the address that owns them. All properties have /// some valid owner address, even gen0 properties are created with a non-zero owner. mapping (uint256 => address) public propertyIndexToOwner; /// @dev A mapping from property IDs to the data that is stored on them. mapping (uint256 => string) public propertyIndexToData; /// @dev A mapping from owner address to count of tokens that address owns. /// Used internally inside balanceOf() to resolve ownership count. mapping (address => uint256) ownershipTokenCount; /// @dev Mappings between property nodes. mapping (uint256 => uint256) public districtToBuildingsCount; mapping (uint256 => uint256[]) public districtToBuildings; mapping (uint256 => uint256) public buildingToUnitCount; mapping (uint256 => uint256[]) public buildingToUnits; /// @dev A mapping from building propertyId to unit construction privacy. mapping (uint256 => bool) public buildingIsPublic; /// @dev A mapping from PropertyIDs to an address that has been approved to call /// transferFrom(). Each Property can only have one approved address for transfer /// at any time. A zero value means no approval is outstanding. mapping (uint256 => address) public propertyIndexToApproved; /// @dev Assigns ownership of a specific Property to an address. function _transfer(address _from, address _to, uint256 _tokenId) internal { // since the number of properties is capped to 2^32 // there is no way to overflow this ownershipTokenCount[_to]++; // transfer ownership propertyIndexToOwner[_tokenId] = _to; // When creating new properties _from is 0x0, but we can't account that address. if (_from != address(0)) { ownershipTokenCount[_from]--; // clear any previously approved ownership exchange delete propertyIndexToApproved[_tokenId]; } // Emit the transfer event. Transfer(_from, _to, _tokenId); } function _createUnit( uint256 _parent, uint256 _x, uint256 _y, uint256 _z, address _owner ) internal returns (uint) { require(_x == uint256(uint8(_x))); require(_y == uint256(uint8(_y))); require(_z == uint256(uint8(_z))); require(!world[_x][_y][_z]); world[_x][_y][_z] = true; return _createProperty( _parent, PropertyClass.UNIT, _x, _y, _z, 0, 0, _owner ); } function _createBuilding( uint256 _parent, uint256 _x, uint256 _y, uint256 _z, uint256 _dx, uint256 _dz, address _owner, bool _public ) internal returns (uint) { require(_x == uint256(uint8(_x))); require(_y == uint256(uint8(_y))); require(_z == uint256(uint8(_z))); require(_dx == uint256(uint8(_dx))); require(_dz == uint256(uint8(_dz))); // Looping over world space. for(uint256 i = 0; i < _dx; i++) { for(uint256 j = 0; j <_dz; j++) { if (world[_x + i][0][_z + j]) { revert(); } world[_x + i][0][_z + j] = true; } } uint propertyId = _createProperty( _parent, PropertyClass.BUILDING, _x, _y, _z, _dx, _dz, _owner ); districtToBuildingsCount[_parent]++; districtToBuildings[_parent].push(propertyId); buildingIsPublic[propertyId] = _public; return propertyId; } function _createDistrict( uint256 _x, uint256 _z, uint256 _dx, uint256 _dz ) internal returns (uint) { require(_x == uint256(uint8(_x))); require(_z == uint256(uint8(_z))); require(_dx == uint256(uint8(_dx))); require(_dz == uint256(uint8(_dz))); uint propertyId = _createProperty( districts.length, PropertyClass.DISTRICT, _x, 0, _z, _dx, _dz, cooAddress ); districts.push(propertyId); return propertyId; } /// @dev An internal method that creates a new property 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 Construct event /// and a Transfer event. function _createProperty( uint256 _parent, PropertyClass _class, uint256 _x, uint256 _y, uint256 _z, uint256 _dx, uint256 _dz, address _owner ) internal returns (uint) { require(_x == uint256(uint8(_x))); require(_y == uint256(uint8(_y))); require(_z == uint256(uint8(_z))); require(_dx == uint256(uint8(_dx))); require(_dz == uint256(uint8(_dz))); require(_parent == uint256(uint32(_parent))); require(uint256(_class) <= 3); Property memory _property = Property({ parent: uint32(_parent), class: _class, x: uint8(_x), y: uint8(_y), z: uint8(_z), dx: uint8(_dx), dz: uint8(_dz) }); uint256 _tokenId = properties.push(_property) - 1; // It's never going to happen, 4 billion properties is A LOT, but // let's just be 100% sure we never let this happen. require(_tokenId <= 4294967295); Construct( _owner, _tokenId, _property.class, _property.x, _property.y, _property.z, _property.dx, _property.dz, "" ); // This will assign ownership, and also emit the Transfer event as // per ERC721 draft _transfer(0, _owner, _tokenId); return _tokenId; } /// @dev Computing height of a building with respect to city progression. function _computeHeight( uint256 _x, uint256 _z, uint256 _height ) internal view returns (uint256) { uint256 x = _x < 50 ? 50 - _x : _x - 50; uint256 z = _z < 50 ? 50 - _z : _z - 50; uint256 distance = x > z ? x : z; if (distance > progress) { return 1; } uint256 scale = 100 - (distance * 100) / progress ; uint256 height = 2 * progress * _height * scale / 10000; return height > 0 ? height : 1; } /// @dev Convenience function to see if this building has room for a unit. function canCreateUnit(uint256 _buildingId) public view returns(bool) { Property storage _property = properties[_buildingId]; if (_property.class == PropertyClass.BUILDING && (buildingIsPublic[_buildingId] || propertyIndexToOwner[_buildingId] == msg.sender) ) { uint256 totalVolume = _property.dx * _property.dz * (_computeHeight(_property.x, _property.z, _property.y) - 1); uint256 totalUnits = buildingToUnitCount[_buildingId]; return totalUnits < totalVolume; } return false; } /// @dev This internal function skips all validation checks. Ensure that // canCreateUnit() is required before calling this method. function _createUnitHelper(uint256 _buildingId, address _owner) internal returns(uint256) { // Grab a reference to the property in storage. Property storage _property = properties[_buildingId]; uint256 totalArea = _property.dx * _property.dz; uint256 index = buildingToUnitCount[_buildingId]; // Calculate next location. uint256 y = index / totalArea + 1; uint256 intermediate = index % totalArea; uint256 z = intermediate / _property.dx; uint256 x = intermediate % _property.dx; uint256 unitId = _createUnit( _buildingId, x + _property.x, y, z + _property.z, _owner ); buildingToUnitCount[_buildingId]++; buildingToUnits[_buildingId].push(unitId); // Return the new unit's ID. return unitId; } /// @dev Update allows for setting a building privacy. function updateBuildingPrivacy(uint _tokenId, bool _public) public { require(propertyIndexToOwner[_tokenId] == msg.sender); buildingIsPublic[_tokenId] = _public; } /// @dev Update allows for setting the data associated to a property. function updatePropertyData(uint _tokenId, string _data) public { require(updateEnabled); address _owner = propertyIndexToOwner[_tokenId]; require(msg.sender == _owner); propertyIndexToData[_tokenId] = _data; Property memory _property = properties[_tokenId]; Construct( _owner, _tokenId, _property.class, _property.x, _property.y, _property.z, _property.dx, _property.dz, _data ); } } // File: contracts-origin/ERC721Draft.sol /// @title Interface for contracts conforming to ERC-721: Non-Fungible Tokens /// @author Dieter Shirley <[email protected]> (https://github.com/dete) contract ERC721 { function implementsERC721() public pure returns (bool); function totalSupply() public view returns (uint256 total); function balanceOf(address _owner) public view returns (uint256 balance); function ownerOf(uint256 _tokenId) public view returns (address owner); function approve(address _to, uint256 _tokenId) public; function transferFrom(address _from, address _to, uint256 _tokenId) public; function transfer(address _to, uint256 _tokenId) public; event Transfer(address indexed from, address indexed to, uint256 indexed tokenId); event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId); // Optional // function name() public view returns (string name); // function symbol() public view returns (string symbol); // function tokensOfOwner(address _owner) external view returns (uint256[] tokenIds); // function tokenMetadata(uint256 _tokenId) public view returns (string infoUrl); } // File: contracts-origin/AetherOwnership.sol /// @title The facet of the Aether core contract that manages ownership, ERC-721 (draft) compliant. /// @dev Ref: https://github.com/ethereum/EIPs/issues/721 /// See the PropertyCore contract documentation to understand how the various contract facets are arranged. contract AetherOwnership is AetherBase, ERC721 { /// @notice Name and symbol of the non fungible token, as defined in ERC721. string public name = "Aether"; string public symbol = "AETH"; function implementsERC721() public pure returns (bool) { return true; } // Internal utility functions: These functions all assume that their input arguments // are valid. We leave it to public methods to sanitize their inputs and follow // the required logic. /// @dev Checks if a given address is the current owner of a particular Property. /// @param _claimant the address we are validating against. /// @param _tokenId property id, only valid when > 0 function _owns(address _claimant, uint256 _tokenId) internal view returns (bool) { return propertyIndexToOwner[_tokenId] == _claimant; } /// @dev Checks if a given address currently has transferApproval for a particular Property. /// @param _claimant the address we are confirming property is approved for. /// @param _tokenId property id, only valid when > 0 function _approvedFor(address _claimant, uint256 _tokenId) internal view returns (bool) { return propertyIndexToApproved[_tokenId] == _claimant; } /// @dev Marks an address as being approved for transferFrom(), overwriting any previous /// approval. Setting _approved to address(0) clears all transfer approval. /// NOTE: _approve() does NOT send the Approval event. This is intentional because /// _approve() and transferFrom() are used together for putting Properties on auction, and /// there is no value in spamming the log with Approval events in that case. function _approve(uint256 _tokenId, address _approved) internal { propertyIndexToApproved[_tokenId] = _approved; } /// @dev Transfers a property owned by this contract to the specified address. /// Used to rescue lost properties. (There is no "proper" flow where this contract /// should be the owner of any Property. This function exists for us to reassign /// the ownership of Properties that users may have accidentally sent to our address.) /// @param _propertyId - ID of property /// @param _recipient - Address to send the property to function rescueLostProperty(uint256 _propertyId, address _recipient) public onlyCOO whenNotPaused { require(_owns(this, _propertyId)); _transfer(this, _recipient, _propertyId); } /// @notice Returns the number of Properties owned by a specific address. /// @param _owner The owner address to check. /// @dev Required for ERC-721 compliance function balanceOf(address _owner) public view returns (uint256 count) { return ownershipTokenCount[_owner]; } /// @notice Transfers a Property to another address. If transferring to a smart /// contract be VERY CAREFUL to ensure that it is aware of ERC-721 (or /// Laputa specifically) or your Property may be lost forever. Seriously. /// @param _to The address of the recipient, can be a user or contract. /// @param _tokenId The ID of the Property to transfer. /// @dev Required for ERC-721 compliance. function transfer( address _to, uint256 _tokenId ) public whenNotPaused { // Safety check to prevent against an unexpected 0x0 default. require(_to != address(0)); // You can only send your own property. require(_owns(msg.sender, _tokenId)); // Reassign ownership, clear pending approvals, emit Transfer event. _transfer(msg.sender, _to, _tokenId); } /// @notice Grant another address the right to transfer a specific Property via /// transferFrom(). This is the preferred flow for transfering NFTs to contracts. /// @param _to The address to be granted transfer approval. Pass address(0) to /// clear all approvals. /// @param _tokenId The ID of the Property that can be transferred if this call succeeds. /// @dev Required for ERC-721 compliance. function approve( address _to, uint256 _tokenId ) public whenNotPaused { // Only an owner can grant transfer approval. require(_owns(msg.sender, _tokenId)); // Register the approval (replacing any previous approval). _approve(_tokenId, _to); // Emit approval event. Approval(msg.sender, _to, _tokenId); } /// @notice Transfer a Property owned by another address, for which the calling address /// has previously been granted transfer approval by the owner. /// @param _from The address that owns the Property to be transfered. /// @param _to The address that should take ownership of the Property. Can be any address, /// including the caller. /// @param _tokenId The ID of the Property to be transferred. /// @dev Required for ERC-721 compliance. function transferFrom( address _from, address _to, uint256 _tokenId ) public whenNotPaused { // Check for approval and valid ownership require(_approvedFor(msg.sender, _tokenId)); require(_owns(_from, _tokenId)); // Reassign ownership (also clears pending approvals and emits Transfer event). _transfer(_from, _to, _tokenId); } /// @notice Returns the total number of Properties currently in existence. /// @dev Required for ERC-721 compliance. function totalSupply() public view returns (uint) { return properties.length; } function totalDistrictSupply() public view returns(uint count) { return districts.length; } /// @notice Returns the address currently assigned ownership of a given Property. /// @dev Required for ERC-721 compliance. function ownerOf(uint256 _tokenId) public view returns (address owner) { owner = propertyIndexToOwner[_tokenId]; require(owner != address(0)); } /// @notice Returns a list of all Property IDs assigned to an address. /// @param _owner The owner whose Properties we are interested in. /// @dev This method MUST NEVER be called by smart contract code. First, it's fairly /// expensive (it walks the entire Kitty 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[] ownerTokens) { uint256 tokenCount = balanceOf(_owner); if (tokenCount == 0) { // Return an empty array return new uint256[](0); } else { uint256[] memory result = new uint256[](tokenCount); uint256 totalProperties = totalSupply(); uint256 resultIndex = 0; // We count on the fact that all properties have IDs starting at 1 and increasing // sequentially up to the totalProperties count. uint256 tokenId; for (tokenId = 1; tokenId <= totalProperties; tokenId++) { if (propertyIndexToOwner[tokenId] == _owner) { result[resultIndex] = tokenId; resultIndex++; } } return result; } } } // File: contracts-origin/Auction/ClockAuctionBase.sol /// @title Auction Core /// @dev Contains models, variables, and internal methods for the auction. contract ClockAuctionBase { // Represents an auction on an NFT struct Auction { // Current owner of NFT address seller; // Price (in wei) at beginning of auction uint128 startingPrice; // Price (in wei) at end of auction uint128 endingPrice; // Duration (in seconds) of auction uint64 duration; // Time when auction started // NOTE: 0 if this auction has been concluded uint64 startedAt; } // Reference to contract tracking NFT ownership ERC721 public nonFungibleContract; // Cut owner takes on each auction, measured in basis points (1/100 of a percent). // Values 0-10,000 map to 0%-100% uint256 public ownerCut; // Map from token ID to their corresponding auction. mapping (uint256 => Auction) tokenIdToAuction; event AuctionCreated(uint256 tokenId, uint256 startingPrice, uint256 endingPrice, uint256 duration); event AuctionSuccessful(uint256 tokenId, uint256 totalPrice, address winner); event AuctionCancelled(uint256 tokenId); /// @dev DON'T give me your money. function() external {} // Modifiers to check that inputs can be safely stored with a certain // number of bits. We use constants and multiple modifiers to save gas. modifier canBeStoredWith64Bits(uint256 _value) { require(_value <= 18446744073709551615); _; } modifier canBeStoredWith128Bits(uint256 _value) { require(_value < 340282366920938463463374607431768211455); _; } /// @dev Returns true if the claimant owns the token. /// @param _claimant - Address claiming to own the token. /// @param _tokenId - ID of token whose ownership to verify. function _owns(address _claimant, uint256 _tokenId) internal view returns (bool) { return (nonFungibleContract.ownerOf(_tokenId) == _claimant); } /// @dev Escrows the NFT, assigning ownership to this contract. /// Throws if the escrow fails. /// @param _owner - Current owner address of token to escrow. /// @param _tokenId - ID of token whose approval to verify. function _escrow(address _owner, uint256 _tokenId) internal { // it will throw if transfer fails nonFungibleContract.transferFrom(_owner, this, _tokenId); } /// @dev Transfers an NFT owned by this contract to another address. /// Returns true if the transfer succeeds. /// @param _receiver - Address to transfer NFT to. /// @param _tokenId - ID of token to transfer. function _transfer(address _receiver, uint256 _tokenId) internal { // it will throw if transfer fails nonFungibleContract.transfer(_receiver, _tokenId); } /// @dev Adds an auction to the list of open auctions. Also fires the /// AuctionCreated event. /// @param _tokenId The ID of the token to be put on auction. /// @param _auction Auction to add. function _addAuction(uint256 _tokenId, Auction _auction) internal { // Require that all auctions have a duration of // at least one minute. (Keeps our math from getting hairy!) require(_auction.duration >= 1 minutes); tokenIdToAuction[_tokenId] = _auction; AuctionCreated( uint256(_tokenId), uint256(_auction.startingPrice), uint256(_auction.endingPrice), uint256(_auction.duration) ); } /// @dev Cancels an auction unconditionally. function _cancelAuction(uint256 _tokenId, address _seller) internal { _removeAuction(_tokenId); _transfer(_seller, _tokenId); AuctionCancelled(_tokenId); } /// @dev Computes the price and transfers winnings. /// Does NOT transfer ownership of token. function _bid(uint256 _tokenId, uint256 _bidAmount) internal returns (uint256) { // Get a reference to the auction struct Auction storage auction = tokenIdToAuction[_tokenId]; // Explicitly check that this auction is currently live. // (Because of how Ethereum mappings work, we can't just count // on the lookup above failing. An invalid _tokenId will just // return an auction object that is all zeros.) require(_isOnAuction(auction)); // Check that the incoming bid is higher than the current // price uint256 price = _currentPrice(auction); require(_bidAmount >= price); // Grab a reference to the seller before the auction struct // gets deleted. address seller = auction.seller; // The bid is good! Remove the auction before sending the fees // to the sender so we can't have a reentrancy attack. _removeAuction(_tokenId); // Transfer proceeds to seller (if there are any!) if (price > 0) { // Calculate the auctioneer's cut. // (NOTE: _computeCut() is guaranteed to return a // value <= price, so this subtraction can't go negative.) uint256 auctioneerCut = _computeCut(price); uint256 sellerProceeds = price - auctioneerCut; // NOTE: Doing a transfer() in the middle of a complex // method like this is generally discouraged because of // reentrancy attacks and DoS attacks if the seller is // a contract with an invalid fallback function. We explicitly // guard against reentrancy attacks by removing the auction // before calling transfer(), and the only thing the seller // can DoS is the sale of their own asset! (And if it's an // accident, they can call cancelAuction(). ) seller.transfer(sellerProceeds); } // Tell the world! AuctionSuccessful(_tokenId, price, msg.sender); return price; } /// @dev Removes an auction from the list of open auctions. /// @param _tokenId - ID of NFT on auction. function _removeAuction(uint256 _tokenId) internal { delete tokenIdToAuction[_tokenId]; } /// @dev Returns true if the NFT is on auction. /// @param _auction - Auction to check. function _isOnAuction(Auction storage _auction) internal view returns (bool) { return (_auction.startedAt > 0); } /// @dev Returns current price of an NFT on auction. Broken into two /// functions (this one, that computes the duration from the auction /// structure, and the other that does the price computation) so we /// can easily test that the price computation works correctly. function _currentPrice(Auction storage _auction) internal view returns (uint256) { uint256 secondsPassed = 0; // A bit of insurance against negative values (or wraparound). // Probably not necessary (since Ethereum guarnatees that the // now variable doesn't ever go backwards). if (now > _auction.startedAt) { secondsPassed = now - _auction.startedAt; } return _computeCurrentPrice( _auction.startingPrice, _auction.endingPrice, _auction.duration, secondsPassed ); } /// @dev Computes the current price of an auction. Factored out /// from _currentPrice so we can run extensive unit tests. /// When testing, make this function public and turn on /// `Current price computation` test suite. function _computeCurrentPrice( uint256 _startingPrice, uint256 _endingPrice, uint256 _duration, uint256 _secondsPassed ) internal pure returns (uint256) { // NOTE: We don't use SafeMath (or similar) in this function because // all of our public functions carefully cap the maximum values for // time (at 64-bits) and currency (at 128-bits). _duration is // also known to be non-zero (see the require() statement in // _addAuction()) if (_secondsPassed >= _duration) { // We've reached the end of the dynamic pricing portion // of the auction, just return the end price. return _endingPrice; } else { // Starting price can be higher than ending price (and often is!), so // this delta can be negative. int256 totalPriceChange = int256(_endingPrice) - int256(_startingPrice); // This multiplication can't overflow, _secondsPassed will easily fit within // 64-bits, and totalPriceChange will easily fit within 128-bits, their product // will always fit within 256-bits. int256 currentPriceChange = totalPriceChange * int256(_secondsPassed) / int256(_duration); // currentPriceChange can be negative, but if so, will have a magnitude // less that _startingPrice. Thus, this result will always end up positive. int256 currentPrice = int256(_startingPrice) + currentPriceChange; return uint256(currentPrice); } } /// @dev Computes owner's cut of a sale. /// @param _price - Sale price of NFT. function _computeCut(uint256 _price) internal view returns (uint256) { // NOTE: We don't use SafeMath (or similar) in this function because // all of our entry functions carefully cap the maximum values for // currency (at 128-bits), and ownerCut <= 10000 (see the require() // statement in the ClockAuction constructor). The result of this // function is always guaranteed to be <= _price. return _price * ownerCut / 10000; } } // File: zeppelin-solidity/contracts/ownership/Ownable.sol /** * @title Ownable * @dev The Ownable contract has an owner address, and provides basic authorization control * functions, this simplifies the implementation of "user permissions". */ contract Ownable { address public owner; /** * @dev The Ownable constructor sets the original `owner` of the contract to the sender * account. */ function Ownable() { owner = msg.sender; } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { require(msg.sender == owner); _; } /** * @dev Allows the current owner to transfer control of the contract to a newOwner. * @param newOwner The address to transfer ownership to. */ function transferOwnership(address newOwner) onlyOwner { if (newOwner != address(0)) { owner = newOwner; } } } // File: zeppelin-solidity/contracts/lifecycle/Pausable.sol /** * @title Pausable * @dev Base contract which allows children to implement an emergency stop mechanism. */ contract Pausable is Ownable { event Pause(); event Unpause(); bool public paused = false; /** * @dev modifier to allow actions only when the contract IS paused */ modifier whenNotPaused() { require(!paused); _; } /** * @dev modifier to allow actions only when the contract IS NOT paused */ modifier whenPaused { require(paused); _; } /** * @dev called by the owner to pause, triggers stopped state */ function pause() onlyOwner whenNotPaused returns (bool) { paused = true; Pause(); return true; } /** * @dev called by the owner to unpause, returns to normal state */ function unpause() onlyOwner whenPaused returns (bool) { paused = false; Unpause(); return true; } } // File: contracts-origin/Auction/ClockAuction.sol /// @title Clock auction for non-fungible tokens. contract ClockAuction is Pausable, ClockAuctionBase { /// @dev Constructor creates a reference to the NFT ownership contract /// and verifies the owner cut is in the valid range. /// @param _nftAddress - address of a deployed contract implementing /// the Nonfungible Interface. /// @param _cut - percent cut the owner takes on each auction, must be /// between 0-10,000. function ClockAuction(address _nftAddress, uint256 _cut) public { require(_cut <= 10000); ownerCut = _cut; ERC721 candidateContract = ERC721(_nftAddress); require(candidateContract.implementsERC721()); nonFungibleContract = candidateContract; } /// @dev Remove all Ether from the contract, which is the owner's cuts /// as well as any Ether sent directly to the contract address. /// Always transfers to the NFT contract, but can be called either by /// the owner or the NFT contract. function withdrawBalance() external { address nftAddress = address(nonFungibleContract); require( msg.sender == owner || msg.sender == nftAddress ); nftAddress.transfer(this.balance); } /// @dev Creates and begins a new auction. /// @param _tokenId - ID of token to auction, sender must be owner. /// @param _startingPrice - Price of item (in wei) at beginning of auction. /// @param _endingPrice - Price of item (in wei) at end of auction. /// @param _duration - Length of time to move between starting /// price and ending price (in seconds). /// @param _seller - Seller, if not the message sender function createAuction( uint256 _tokenId, uint256 _startingPrice, uint256 _endingPrice, uint256 _duration, address _seller ) public whenNotPaused canBeStoredWith128Bits(_startingPrice) canBeStoredWith128Bits(_endingPrice) canBeStoredWith64Bits(_duration) { require(_owns(msg.sender, _tokenId)); _escrow(msg.sender, _tokenId); Auction memory auction = Auction( _seller, uint128(_startingPrice), uint128(_endingPrice), uint64(_duration), uint64(now) ); _addAuction(_tokenId, auction); } /// @dev Bids on an open auction, completing the auction and transferring /// ownership of the NFT if enough Ether is supplied. /// @param _tokenId - ID of token to bid on. function bid(uint256 _tokenId) public payable whenNotPaused { // _bid will throw if the bid or funds transfer fails _bid(_tokenId, msg.value); _transfer(msg.sender, _tokenId); } /// @dev Cancels an auction that hasn't been won yet. /// Returns the NFT to original owner. /// @notice This is a state-modifying function that can /// be called while the contract is paused. /// @param _tokenId - ID of token on auction function cancelAuction(uint256 _tokenId) public { Auction storage auction = tokenIdToAuction[_tokenId]; require(_isOnAuction(auction)); address seller = auction.seller; require(msg.sender == seller); _cancelAuction(_tokenId, seller); } /// @dev Cancels an auction when the contract is paused. /// Only the owner may do this, and NFTs are returned to /// the seller. This should only be used in emergencies. /// @param _tokenId - ID of the NFT on auction to cancel. function cancelAuctionWhenPaused(uint256 _tokenId) whenPaused onlyOwner public { Auction storage auction = tokenIdToAuction[_tokenId]; require(_isOnAuction(auction)); _cancelAuction(_tokenId, auction.seller); } /// @dev Returns auction info for an NFT on auction. /// @param _tokenId - ID of NFT on auction. function getAuction(uint256 _tokenId) public view returns ( address seller, uint256 startingPrice, uint256 endingPrice, uint256 duration, uint256 startedAt ) { Auction storage auction = tokenIdToAuction[_tokenId]; require(_isOnAuction(auction)); return ( auction.seller, auction.startingPrice, auction.endingPrice, auction.duration, auction.startedAt ); } /// @dev Returns the current price of an auction. /// @param _tokenId - ID of the token price we are checking. function getCurrentPrice(uint256 _tokenId) public view returns (uint256) { Auction storage auction = tokenIdToAuction[_tokenId]; require(_isOnAuction(auction)); return _currentPrice(auction); } } // File: contracts-origin/Auction/AetherClockAuction.sol /// @title Clock auction modified for sale of property contract AetherClockAuction is ClockAuction { // @dev Sanity check that allows us to ensure that we are pointing to the // right auction in our setSaleAuctionAddress() call. bool public isAetherClockAuction = true; // Tracks last 5 sale price of gen0 property sales uint256 public saleCount; uint256[5] public lastSalePrices; // Delegate constructor function AetherClockAuction(address _nftAddr, uint256 _cut) public ClockAuction(_nftAddr, _cut) {} /// @dev Creates and begins a new auction. /// @param _tokenId - ID of token to auction, sender must be owner. /// @param _startingPrice - Price of item (in wei) at beginning of auction. /// @param _endingPrice - Price of item (in wei) at end of auction. /// @param _duration - Length of auction (in seconds). /// @param _seller - Seller, if not the message sender function createAuction( uint256 _tokenId, uint256 _startingPrice, uint256 _endingPrice, uint256 _duration, address _seller ) public canBeStoredWith128Bits(_startingPrice) canBeStoredWith128Bits(_endingPrice) canBeStoredWith64Bits(_duration) { require(msg.sender == address(nonFungibleContract)); _escrow(_seller, _tokenId); Auction memory auction = Auction( _seller, uint128(_startingPrice), uint128(_endingPrice), uint64(_duration), uint64(now) ); _addAuction(_tokenId, auction); } /// @dev Updates lastSalePrice if seller is the nft contract /// Otherwise, works the same as default bid method. function bid(uint256 _tokenId) public payable { // _bid verifies token ID size address seller = tokenIdToAuction[_tokenId].seller; uint256 price = _bid(_tokenId, msg.value); _transfer(msg.sender, _tokenId); // If not a gen0 auction, exit if (seller == address(nonFungibleContract)) { // Track gen0 sale prices lastSalePrices[saleCount % 5] = price; saleCount++; } } function averageSalePrice() public view returns (uint256) { uint256 sum = 0; for (uint256 i = 0; i < 5; i++) { sum += lastSalePrices[i]; } return sum / 5; } } // File: contracts-origin/AetherAuction.sol /// @title Handles creating auctions for sale and siring of properties. /// This wrapper of ReverseAuction exists only so that users can create /// auctions with only one transaction. contract AetherAuction is AetherOwnership{ /// @dev The address of the ClockAuction contract that handles sales of Aether. This /// same contract handles both peer-to-peer sales as well as the gen0 sales which are /// initiated every 15 minutes. AetherClockAuction public saleAuction; /// @dev Sets the reference to the sale auction. /// @param _address - Address of sale contract. function setSaleAuctionAddress(address _address) public onlyCEO { AetherClockAuction candidateContract = AetherClockAuction(_address); // NOTE: verify that a contract is what we expect require(candidateContract.isAetherClockAuction()); // Set the new contract address saleAuction = candidateContract; } /// @dev Put a property up for auction. /// Does some ownership trickery to create auctions in one tx. function createSaleAuction( uint256 _propertyId, uint256 _startingPrice, uint256 _endingPrice, uint256 _duration ) public whenNotPaused { // Auction contract checks input sizes // If property is already on any auction, this will throw // because it will be owned by the auction contract. require(_owns(msg.sender, _propertyId)); _approve(_propertyId, saleAuction); // Sale auction throws if inputs are invalid and clears // transfer and sire approval after escrowing the property. saleAuction.createAuction( _propertyId, _startingPrice, _endingPrice, _duration, msg.sender ); } /// @dev Transfers the balance of the sale auction contract /// to the AetherCore contract. We use two-step withdrawal to /// prevent two transfer calls in the auction bid function. function withdrawAuctionBalances() external onlyCOO { saleAuction.withdrawBalance(); } } // File: contracts-origin/AetherConstruct.sol // Auction wrapper functions /// @title all functions related to creating property contract AetherConstruct is AetherAuction { uint256 public districtLimit = 16; uint256 public startingPrice = 1 ether; uint256 public auctionDuration = 1 days; /// @dev Units can be contructed within public and owned buildings. function createUnit(uint256 _buildingId) public payable returns(uint256) { require(canCreateUnit(_buildingId)); require(msg.value >= unitCreationFee); if (msg.value > unitCreationFee) msg.sender.transfer(msg.value - unitCreationFee); uint256 propertyId = _createUnitHelper(_buildingId, msg.sender); return propertyId; } /// @dev Creation of unit properties. Only callable by COO function createUnitOmni( uint32 _buildingId, address _owner ) public onlyCOO { if (_owner == address(0)) { _owner = cooAddress; } require(canCreateUnit(_buildingId)); _createUnitHelper(_buildingId, _owner); } /// @dev Creation of building properties. Only callable by COO function createBuildingOmni( uint32 _districtId, uint8 _x, uint8 _y, uint8 _z, uint8 _dx, uint8 _dz, address _owner, bool _open ) public onlyCOO { if (_owner == address(0)) { _owner = cooAddress; } _createBuilding(_districtId, _x, _y, _z, _dx, _dz, _owner, _open); } /// @dev Creation of district properties, up to a limit. Only callable by COO function createDistrictOmni( uint8 _x, uint8 _z, uint8 _dx, uint8 _dz ) public onlyCOO { require(districts.length < districtLimit); _createDistrict(_x, _z, _dx, _dz); } /// @dev Creates a new property with the given details and /// creates an auction for it. Only callable by COO. function createBuildingAuction( uint32 _districtId, uint8 _x, uint8 _y, uint8 _z, uint8 _dx, uint8 _dz, bool _open ) public onlyCOO { uint256 propertyId = _createBuilding(_districtId, _x, _y, _z, _dx, _dz, address(this), _open); _approve(propertyId, saleAuction); saleAuction.createAuction( propertyId, _computeNextPrice(), 0, auctionDuration, address(this) ); } /// @dev Updates the minimum payment required for calling createUnit(). Can only /// be called by the COO address. function setUnitCreationFee(uint256 _value) public onlyCOO { unitCreationFee = _value; } /// @dev Update world progression factor allowing for buildings to grow taller // as the city expands. Only callable by COO. function setProgress(uint256 _progress) public onlyCOO { require(_progress <= 100); require(_progress > progress); progress = _progress; } /// @dev Set property data updates flag. Only callable by COO. function setUpdateState(bool _updateEnabled) public onlyCOO { updateEnabled = _updateEnabled; } /// @dev Computes the next auction starting price, given the average of the past /// 5 prices + 50%. function _computeNextPrice() internal view returns (uint256) { uint256 avePrice = saleAuction.averageSalePrice(); // sanity check to ensure we don't overflow arithmetic (this big number is 2^128-1). require(avePrice < 340282366920938463463374607431768211455); uint256 nextPrice = avePrice + (avePrice / 2); // We never auction for less than starting price if (nextPrice < startingPrice) { nextPrice = startingPrice; } return nextPrice; } } // File: contracts-origin/AetherCore.sol /// @title Aether: A city on the Ethereum blockchain. /// @author Axiom Zen (https://www.axiomzen.co) contract AetherCore is AetherConstruct { // This is the main Aether contract. In order to keep our code seperated into logical sections, // we've broken it up in two ways. The auctions are seperate since their logic is somewhat complex // and there's always a risk of subtle bugs. By keeping them in their own contracts, we can upgrade // them without disrupting the main contract that tracks property ownership. // // Secondly, we break the core contract into multiple files using inheritence, one for each major // facet of functionality of Aether. This allows us to keep related code bundled together while still // avoiding a single giant file with everything in it. The breakdown is as follows: // // - AetherBase: This is where we define the most fundamental code shared throughout the core // functionality. This includes our main data storage, constants and data types, plus // internal functions for managing these items. // // - AetherAccessControl: This contract manages the various addresses and constraints for operations // that can be executed only by specific roles. Namely CEO, CFO and COO. // // - AetherOwnership: This provides the methods required for basic non-fungible token // transactions, following the draft ERC-721 spec (https://github.com/ethereum/EIPs/issues/721). // // - AetherAuction: Here we have the public methods for auctioning or bidding on property. // The actual auction functionality is handled in two sibling contracts while auction // creation and bidding is mostly mediated through this facet of the core contract. // // - AetherConstruct: This final facet contains the functionality we use for creating new gen0 cats. // the community is new). // Set in case the core contract is broken and an upgrade is required address public newContractAddress; /// @notice Creates the main Aether smart contract instance. function AetherCore() public { // Starts paused. paused = true; // the creator of the contract is the initial CEO ceoAddress = msg.sender; // the creator of the contract is also the initial COO cooAddress = msg.sender; } /// @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) public onlyCEO whenPaused { // See README.md for updgrade plan newContractAddress = _v2Address; ContractUpgrade(_v2Address); } /// @notice No tipping! /// @dev Reject all Ether from being sent here, unless it's from one of the /// two auction contracts. (Hopefully, we can prevent user accidents.) function() external payable { require( msg.sender == address(saleAuction) ); } /// @notice Returns all the relevant information about a specific property. /// @param _id The ID of the property of interest. function getProperty(uint256 _id) public view returns ( uint32 parent, uint8 class, uint8 x, uint8 y, uint8 z, uint8 dx, uint8 dz, uint8 height ) { Property storage property = properties[_id]; parent = uint32(property.parent); class = uint8(property.class); height = uint8(property.y); if (property.class == PropertyClass.BUILDING) { y = uint8(_computeHeight(property.x, property.z, property.y)); } else { y = uint8(property.y); } x = uint8(property.x); z = uint8(property.z); dx = uint8(property.dx); dz = uint8(property.dz); } /// @dev Override unpause so it requires all external contract addresses /// to be set before contract can be unpaused. Also, we can't have /// newContractAddress set either, because then the contract was upgraded. function unpause() public onlyCEO whenPaused { require(saleAuction != address(0)); require(newContractAddress == address(0)); // Actually unpause the contract. super.unpause(); } }
Contract Security Audit
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Contract Creation Code
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Swarm Source
bzzr://915f094bd33721ea50df1895ad20a891377cb5b76da4cbb39f2ec348486f80d9
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