ERC-721
Overview
Max Total Supply
496 DPM
Holders
178
Market
Volume (24H)
N/A
Min Price (24H)
N/A
Max Price (24H)
N/A
Other Info
Token Contract
Balance
2 DPMLoading...
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
DigitalPrintImage
Compiler Version
v0.4.24+commit.e67f0147
Optimization Enabled:
No with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity)
/** *Submitted for verification at Etherscan.io on 2018-10-04 */ pragma solidity ^0.4.24; /** * @title ERC165 * @dev https://github.com/ethereum/EIPs/blob/master/EIPS/eip-165.md */ interface ERC165 { /** * @notice Query if a contract implements an interface * @param _interfaceId The interface identifier, as specified in ERC-165 * @dev Interface identification is specified in ERC-165. This function * uses less than 30,000 gas. */ function supportsInterface(bytes4 _interfaceId) external view returns (bool); } /** * @title ERC721 Non-Fungible Token Standard basic interface * @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md */ contract ERC721Basic is ERC165 { bytes4 internal constant InterfaceId_ERC721 = 0x80ac58cd; /* * 0x80ac58cd === * bytes4(keccak256('balanceOf(address)')) ^ * bytes4(keccak256('ownerOf(uint256)')) ^ * bytes4(keccak256('approve(address,uint256)')) ^ * bytes4(keccak256('getApproved(uint256)')) ^ * bytes4(keccak256('setApprovalForAll(address,bool)')) ^ * bytes4(keccak256('isApprovedForAll(address,address)')) ^ * bytes4(keccak256('transferFrom(address,address,uint256)')) ^ * bytes4(keccak256('safeTransferFrom(address,address,uint256)')) ^ * bytes4(keccak256('safeTransferFrom(address,address,uint256,bytes)')) */ bytes4 internal constant InterfaceId_ERC721Exists = 0x4f558e79; /* * 0x4f558e79 === * bytes4(keccak256('exists(uint256)')) */ bytes4 internal constant InterfaceId_ERC721Enumerable = 0x780e9d63; /** * 0x780e9d63 === * bytes4(keccak256('totalSupply()')) ^ * bytes4(keccak256('tokenOfOwnerByIndex(address,uint256)')) ^ * bytes4(keccak256('tokenByIndex(uint256)')) */ bytes4 internal constant InterfaceId_ERC721Metadata = 0x5b5e139f; /** * 0x5b5e139f === * bytes4(keccak256('name()')) ^ * bytes4(keccak256('symbol()')) ^ * bytes4(keccak256('tokenURI(uint256)')) */ 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 ); function balanceOf(address _owner) public view returns (uint256 _balance); function ownerOf(uint256 _tokenId) public view returns (address _owner); function exists(uint256 _tokenId) public view returns (bool _exists); 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 transferFrom(address _from, address _to, uint256 _tokenId) public; function safeTransferFrom(address _from, address _to, uint256 _tokenId) public; function safeTransferFrom( address _from, address _to, uint256 _tokenId, bytes _data ) public; } contract IAssetManager { function createAssetPack(bytes32 _packCover, string _name, uint[] _attributes, bytes32[] _ipfsHashes, uint _packPrice) public; function createAsset(uint _attributes, bytes32 _ipfsHash, uint _packId) public; function buyAssetPack(address _to, uint _assetPackId) public payable; function getNumberOfAssets() public view returns (uint); function getNumberOfAssetPacks() public view returns(uint); function checkHasPermissionForPack(address _address, uint _packId) public view returns (bool); function checkHashExists(bytes32 _ipfsHash) public view returns (bool); function givePermission(address _address, uint _packId) public; function pickUniquePacks(uint [] assetIds) public view returns (uint[]); function getAssetInfo(uint id) public view returns (uint, uint, bytes32); function getAssetPacksUserCreated(address _address) public view returns(uint[]); function getAssetIpfs(uint _id) public view returns (bytes32); function getAssetAttributes(uint _id) public view returns (uint); function getIpfsForAssets(uint [] _ids) public view returns (bytes32[]); function getAttributesForAssets(uint [] _ids) public view returns(uint[]); function withdraw() public; function getAssetPackData(uint _assetPackId) public view returns(string, uint[], uint[], bytes32[]); function getAssetPackName(uint _assetPackId) public view returns (string); function getAssetPackPrice(uint _assetPackId) public view returns (uint); function getCoversForPacks(uint [] _packIds) public view returns (bytes32[]); } /** * @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; event OwnershipRenounced(address indexed previousOwner); event OwnershipTransferred( address indexed previousOwner, address indexed newOwner ); /** * @dev The Ownable constructor sets the original `owner` of the contract to the sender * account. */ constructor() public { 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 relinquish control of the contract. * @notice Renouncing to ownership will leave the contract without an owner. * It will not be possible to call the functions with the `onlyOwner` * modifier anymore. */ function renounceOwnership() public onlyOwner { emit OwnershipRenounced(owner); owner = address(0); } /** * @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) public onlyOwner { _transferOwnership(_newOwner); } /** * @dev Transfers control of the contract to a newOwner. * @param _newOwner The address to transfer ownership to. */ function _transferOwnership(address _newOwner) internal { require(_newOwner != address(0)); emit OwnershipTransferred(owner, _newOwner); owner = _newOwner; } } /** * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension * @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md */ contract ERC721Enumerable is ERC721Basic { 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); } /** * @title ERC-721 Non-Fungible Token Standard, optional metadata extension * @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md */ contract ERC721Metadata is ERC721Basic { function name() external view returns (string _name); function symbol() external view returns (string _symbol); function tokenURI(uint256 _tokenId) public view returns (string); } /** * @title ERC-721 Non-Fungible Token Standard, full implementation interface * @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md */ contract ERC721 is ERC721Basic, ERC721Enumerable, ERC721Metadata { } /** * @title ERC721 token receiver interface * @dev Interface for any contract that wants to support safeTransfers * from ERC721 asset contracts. */ contract ERC721Receiver { /** * @dev Magic value to be returned upon successful reception of an NFT * Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`, * which can be also obtained as `ERC721Receiver(0).onERC721Received.selector` */ bytes4 internal constant ERC721_RECEIVED = 0x150b7a02; /** * @notice Handle the receipt of an NFT * @dev The ERC721 smart contract calls this function on the recipient * after a `safetransfer`. This function MAY throw to revert and reject the * transfer. Return of other than the magic value MUST result in the * transaction being reverted. * Note: the 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(keccak256("onERC721Received(address,address,uint256,bytes)"))` */ function onERC721Received( address _operator, address _from, uint256 _tokenId, bytes _data ) public returns(bytes4); } /** * @title SafeMath * @dev Math operations with safety checks that throw on error */ library SafeMath { /** * @dev Multiplies two numbers, throws on overflow. */ function mul(uint256 _a, uint256 _b) internal pure returns (uint256 c) { // Gas optimization: this is cheaper than asserting 'a' not being zero, but the // benefit is lost if 'b' is also tested. // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522 if (_a == 0) { return 0; } c = _a * _b; assert(c / _a == _b); return c; } /** * @dev Integer division of two numbers, truncating the quotient. */ function div(uint256 _a, uint256 _b) internal pure returns (uint256) { // assert(_b > 0); // Solidity automatically throws when dividing by 0 // uint256 c = _a / _b; // assert(_a == _b * c + _a % _b); // There is no case in which this doesn't hold return _a / _b; } /** * @dev Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend). */ function sub(uint256 _a, uint256 _b) internal pure returns (uint256) { assert(_b <= _a); return _a - _b; } /** * @dev Adds two numbers, throws on overflow. */ function add(uint256 _a, uint256 _b) internal pure returns (uint256 c) { c = _a + _b; assert(c >= _a); return c; } } /** * Utility library of inline functions on addresses */ library AddressUtils { /** * Returns whether the target address is a contract * @dev This function will return false if invoked during the constructor of a contract, * as the code is not actually created until after the constructor finishes. * @param _addr address to check * @return whether the target address is a contract */ function isContract(address _addr) internal view returns (bool) { uint256 size; // XXX Currently there is no better way to check if there is a contract in an address // than to check the size of the code at that address. // See https://ethereum.stackexchange.com/a/14016/36603 // for more details about how this works. // TODO Check this again before the Serenity release, because all addresses will be // contracts then. // solium-disable-next-line security/no-inline-assembly assembly { size := extcodesize(_addr) } return size > 0; } } /** * @title SupportsInterfaceWithLookup * @author Matt Condon (@shrugs) * @dev Implements ERC165 using a lookup table. */ contract SupportsInterfaceWithLookup is ERC165 { bytes4 public constant InterfaceId_ERC165 = 0x01ffc9a7; /** * 0x01ffc9a7 === * bytes4(keccak256('supportsInterface(bytes4)')) */ /** * @dev a mapping of interface id to whether or not it's supported */ mapping(bytes4 => bool) internal supportedInterfaces; /** * @dev A contract implementing SupportsInterfaceWithLookup * implement ERC165 itself */ constructor() public { _registerInterface(InterfaceId_ERC165); } /** * @dev implement supportsInterface(bytes4) using a lookup table */ function supportsInterface(bytes4 _interfaceId) external view returns (bool) { return supportedInterfaces[_interfaceId]; } /** * @dev private method for registering an interface */ function _registerInterface(bytes4 _interfaceId) internal { require(_interfaceId != 0xffffffff); supportedInterfaces[_interfaceId] = true; } } /** * @title ERC721 Non-Fungible Token Standard basic implementation * @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md */ contract ERC721BasicToken is SupportsInterfaceWithLookup, ERC721Basic { using SafeMath for uint256; using AddressUtils for address; // Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))` // which can be also obtained as `ERC721Receiver(0).onERC721Received.selector` bytes4 private constant ERC721_RECEIVED = 0x150b7a02; // Mapping from token ID to owner mapping (uint256 => address) internal tokenOwner; // Mapping from token ID to approved address mapping (uint256 => address) internal tokenApprovals; // Mapping from owner to number of owned token mapping (address => uint256) internal ownedTokensCount; // Mapping from owner to operator approvals mapping (address => mapping (address => bool)) internal operatorApprovals; constructor() public { // register the supported interfaces to conform to ERC721 via ERC165 _registerInterface(InterfaceId_ERC721); _registerInterface(InterfaceId_ERC721Exists); } /** * @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)); return ownedTokensCount[_owner]; } /** * @dev Gets the owner of the specified token ID * @param _tokenId uint256 ID of the token to query the owner of * @return owner 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)); return owner; } /** * @dev Returns whether the specified token exists * @param _tokenId uint256 ID of the token to query the existence of * @return whether the token exists */ function exists(uint256 _tokenId) public view returns (bool) { address owner = tokenOwner[_tokenId]; return owner != address(0); } /** * @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); require(msg.sender == owner || isApprovedForAll(owner, msg.sender)); tokenApprovals[_tokenId] = _to; emit Approval(owner, _to, _tokenId); } /** * @dev Gets the approved address for a token ID, or zero if no address set * @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) { 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 != msg.sender); operatorApprovals[msg.sender][_to] = _approved; emit ApprovalForAll(msg.sender, _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 { require(isApprovedOrOwner(msg.sender, _tokenId)); require(_from != address(0)); require(_to != address(0)); clearApproval(_from, _tokenId); removeTokenFrom(_from, _tokenId); addTokenTo(_to, _tokenId); emit Transfer(_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 `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 { // solium-disable-next-line arg-overflow 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 `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 _data ) public { transferFrom(_from, _to, _tokenId); // solium-disable-next-line arg-overflow require(checkAndCallSafeTransfer(_from, _to, _tokenId, _data)); } /** * @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) { address owner = ownerOf(_tokenId); // Disable solium check because of // https://github.com/duaraghav8/Solium/issues/175 // solium-disable-next-line operator-whitespace return ( _spender == owner || getApproved(_tokenId) == _spender || isApprovedForAll(owner, _spender) ); } /** * @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 by the msg.sender */ function _mint(address _to, uint256 _tokenId) internal { require(_to != address(0)); addTokenTo(_to, _tokenId); emit Transfer(address(0), _to, _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 by the msg.sender */ function _burn(address _owner, uint256 _tokenId) internal { clearApproval(_owner, _tokenId); removeTokenFrom(_owner, _tokenId); emit Transfer(_owner, address(0), _tokenId); } /** * @dev Internal function to clear current approval of a given token ID * Reverts if the given address is not indeed the owner of the token * @param _owner owner of the token * @param _tokenId uint256 ID of the token to be transferred */ function clearApproval(address _owner, uint256 _tokenId) internal { require(ownerOf(_tokenId) == _owner); if (tokenApprovals[_tokenId] != address(0)) { tokenApprovals[_tokenId] = address(0); } } /** * @dev Internal function to add a token ID to the list of a given address * @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 addTokenTo(address _to, uint256 _tokenId) internal { require(tokenOwner[_tokenId] == address(0)); tokenOwner[_tokenId] = _to; ownedTokensCount[_to] = ownedTokensCount[_to].add(1); } /** * @dev Internal function to remove a token ID from the list of a given address * @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 removeTokenFrom(address _from, uint256 _tokenId) internal { require(ownerOf(_tokenId) == _from); ownedTokensCount[_from] = ownedTokensCount[_from].sub(1); tokenOwner[_tokenId] = address(0); } /** * @dev Internal function to invoke `onERC721Received` on a target address * The call is not executed if the target address is not a contract * @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 whether the call correctly returned the expected magic value */ function checkAndCallSafeTransfer( address _from, address _to, uint256 _tokenId, bytes _data ) internal returns (bool) { if (!_to.isContract()) { return true; } bytes4 retval = ERC721Receiver(_to).onERC721Received( msg.sender, _from, _tokenId, _data); return (retval == ERC721_RECEIVED); } } /** * @title Full ERC721 Token * This implementation includes all the required and some optional functionality of the ERC721 standard * Moreover, it includes approve all functionality using operator terminology * @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md */ contract ERC721Token is SupportsInterfaceWithLookup, ERC721BasicToken, ERC721 { // Token name string internal name_; // Token symbol string internal symbol_; // Mapping from owner to list of owned token IDs mapping(address => uint256[]) internal ownedTokens; // Mapping from token ID to index of the owner tokens list mapping(uint256 => uint256) internal ownedTokensIndex; // Array with all token ids, used for enumeration uint256[] internal allTokens; // Mapping from token id to position in the allTokens array mapping(uint256 => uint256) internal allTokensIndex; // Optional mapping for token URIs mapping(uint256 => string) internal tokenURIs; /** * @dev Constructor function */ constructor(string _name, string _symbol) public { name_ = _name; symbol_ = _symbol; // register the supported interfaces to conform to ERC721 via ERC165 _registerInterface(InterfaceId_ERC721Enumerable); _registerInterface(InterfaceId_ERC721Metadata); } /** * @dev Gets the token name * @return string representing the token name */ function name() external view returns (string) { return name_; } /** * @dev Gets the token symbol * @return string representing the token symbol */ function symbol() external view returns (string) { return symbol_; } /** * @dev Returns an URI for a given token ID * Throws if the token ID does not exist. May return an empty string. * @param _tokenId uint256 ID of the token to query */ function tokenURI(uint256 _tokenId) public view returns (string) { require(exists(_tokenId)); return tokenURIs[_tokenId]; } /** * @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)); 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()); return allTokens[_index]; } /** * @dev Internal function to set the token URI for a given token * Reverts if the token ID does not exist * @param _tokenId uint256 ID of the token to set its URI * @param _uri string URI to assign */ function _setTokenURI(uint256 _tokenId, string _uri) internal { require(exists(_tokenId)); tokenURIs[_tokenId] = _uri; } /** * @dev Internal function to add a token ID to the list of a given address * @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 addTokenTo(address _to, uint256 _tokenId) internal { super.addTokenTo(_to, _tokenId); uint256 length = ownedTokens[_to].length; ownedTokens[_to].push(_tokenId); ownedTokensIndex[_tokenId] = length; } /** * @dev Internal function to remove a token ID from the list of a given address * @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 removeTokenFrom(address _from, uint256 _tokenId) internal { super.removeTokenFrom(_from, _tokenId); // To prevent a gap in the array, we store the last token in the index of the token to delete, and // then delete the last slot. uint256 tokenIndex = ownedTokensIndex[_tokenId]; uint256 lastTokenIndex = ownedTokens[_from].length.sub(1); uint256 lastToken = ownedTokens[_from][lastTokenIndex]; ownedTokens[_from][tokenIndex] = lastToken; // This also deletes the contents at the last position of the array ownedTokens[_from].length--; // Note that this will handle single-element arrays. In that case, both tokenIndex and lastTokenIndex are going to // be zero. Then we can make sure that we will remove _tokenId from the ownedTokens list since we are first swapping // the lastToken to the first position, and then dropping the element placed in the last position of the list ownedTokensIndex[_tokenId] = 0; ownedTokensIndex[lastToken] = tokenIndex; } /** * @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 by the msg.sender */ function _mint(address _to, uint256 _tokenId) internal { super._mint(_to, _tokenId); allTokensIndex[_tokenId] = allTokens.length; allTokens.push(_tokenId); } /** * @dev Internal function to burn a specific token * Reverts if the token does not exist * @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]; } // Reorg all tokens array uint256 tokenIndex = allTokensIndex[_tokenId]; uint256 lastTokenIndex = allTokens.length.sub(1); uint256 lastToken = allTokens[lastTokenIndex]; allTokens[tokenIndex] = lastToken; allTokens[lastTokenIndex] = 0; allTokens.length--; allTokensIndex[_tokenId] = 0; allTokensIndex[lastToken] = tokenIndex; } } contract Functions { bytes32[] public randomHashes; function fillWithHashes() public { require(randomHashes.length == 0); for (uint i = block.number - 100; i < block.number; i++) { randomHashes.push(blockhash(i)); } } /// @notice Function to calculate initial random seed based on our hashes /// @param _randomHashIds are ids in our array of hashes /// @param _timestamp is timestamp for that hash /// @return uint representation of random seed function calculateSeed(uint[] _randomHashIds, uint _timestamp) public view returns (uint) { require(_timestamp != 0); require(_randomHashIds.length == 10); bytes32 randomSeed = keccak256( abi.encodePacked( randomHashes[_randomHashIds[0]], randomHashes[_randomHashIds[1]], randomHashes[_randomHashIds[2]], randomHashes[_randomHashIds[3]], randomHashes[_randomHashIds[4]], randomHashes[_randomHashIds[5]], randomHashes[_randomHashIds[6]], randomHashes[_randomHashIds[7]], randomHashes[_randomHashIds[8]], randomHashes[_randomHashIds[9]], _timestamp ) ); return uint(randomSeed); } function getRandomHashesLength() public view returns(uint) { return randomHashes.length; } /// @notice Function which decodes bytes32 to array of integers /// @param _potentialAssets are potential assets user would like to have /// @return array of assetIds function decodeAssets(bytes32[] _potentialAssets) public pure returns (uint[] assets) { require(_potentialAssets.length > 0); uint[] memory assetsCopy = new uint[](_potentialAssets.length*10); uint numberOfAssets = 0; for (uint j = 0; j < _potentialAssets.length; j++) { uint input; bytes32 pot = _potentialAssets[j]; assembly { input := pot } for (uint i = 10; i > 0; i--) { uint mask = (2 << ((i-1) * 24)) / 2; uint b = (input & (mask * 16777215)) / mask; if (b != 0) { assetsCopy[numberOfAssets] = b; numberOfAssets++; } } } assets = new uint[](numberOfAssets); for (i = 0; i < numberOfAssets; i++) { assets[i] = assetsCopy[i]; } } /// @notice Function to pick random assets from potentialAssets array /// @param _finalSeed is final random seed /// @param _potentialAssets is bytes32[] array of potential assets /// @return uint[] array of randomly picked assets function pickRandomAssets(uint _finalSeed, bytes32[] _potentialAssets) public pure returns(uint[] finalPicked) { require(_finalSeed != 0); require(_potentialAssets.length > 0); uint[] memory assetIds = decodeAssets(_potentialAssets); uint[] memory pickedIds = new uint[](assetIds.length); uint finalSeedCopy = _finalSeed; uint index = 0; for (uint i = 0; i < assetIds.length; i++) { finalSeedCopy = uint(keccak256(abi.encodePacked(finalSeedCopy, assetIds[i]))); if (finalSeedCopy % 2 == 0) { pickedIds[index] = assetIds[i]; index++; } } finalPicked = new uint[](index); for (i = 0; i < index; i++) { finalPicked[i] = pickedIds[i]; } } /// @notice Function to pick random assets from potentialAssets array /// @param _finalSeed is final random seed /// @param _potentialAssets is bytes32[] array of potential assets /// @param _width of canvas /// @param _height of canvas /// @return arrays of randomly picked assets defining ids, coordinates, zoom, rotation and layers function getImage(uint _finalSeed, bytes32[] _potentialAssets, uint _width, uint _height) public pure returns(uint[] finalPicked, uint[] x, uint[] y, uint[] zoom, uint[] rotation, uint[] layers) { require(_finalSeed != 0); require(_potentialAssets.length > 0); uint[] memory assetIds = decodeAssets(_potentialAssets); uint[] memory pickedIds = new uint[](assetIds.length); x = new uint[](assetIds.length); y = new uint[](assetIds.length); zoom = new uint[](assetIds.length); rotation = new uint[](assetIds.length); layers = new uint[](assetIds.length); uint finalSeedCopy = _finalSeed; uint index = 0; for (uint i = 0; i < assetIds.length; i++) { finalSeedCopy = uint(keccak256(abi.encodePacked(finalSeedCopy, assetIds[i]))); if (finalSeedCopy % 2 == 0) { pickedIds[index] = assetIds[i]; (x[index], y[index], zoom[index], rotation[index], layers[index]) = pickRandomAssetPosition(finalSeedCopy, _width, _height); index++; } } finalPicked = new uint[](index); for (i = 0; i < index; i++) { finalPicked[i] = pickedIds[i]; } } /// @notice Function to pick random position for an asset /// @param _randomSeed is random seed for that image /// @param _width of canvas /// @param _height of canvas /// @return tuple of uints representing x,y,zoom,and rotation function pickRandomAssetPosition(uint _randomSeed, uint _width, uint _height) public pure returns (uint x, uint y, uint zoom, uint rotation, uint layer) { x = _randomSeed % _width; y = _randomSeed % _height; zoom = _randomSeed % 200 + 800; rotation = _randomSeed % 360; // using random number for now // if two layers are same, sort by (keccak256(layer, assetId)) layer = _randomSeed % 1234567; } /// @notice Function to calculate final random seed for user /// @param _randomSeed is initially given random seed /// @param _iterations is number of iterations /// @return final seed for user as uint function getFinalSeed(uint _randomSeed, uint _iterations) public pure returns (bytes32) { require(_randomSeed != 0); require(_iterations != 0); bytes32 finalSeed = bytes32(_randomSeed); finalSeed = keccak256(abi.encodePacked(_randomSeed, _iterations)); for (uint i = 0; i < _iterations; i++) { finalSeed = keccak256(abi.encodePacked(finalSeed, i)); } return finalSeed; } function toHex(uint _randomSeed) public pure returns (bytes32) { return bytes32(_randomSeed); } } contract UserManager { struct User { string username; bytes32 hashToProfilePicture; bool exists; } uint public numberOfUsers; mapping(string => bool) internal usernameExists; mapping(address => User) public addressToUser; mapping(bytes32 => bool) public profilePictureExists; mapping(string => address) internal usernameToAddress; event NewUser(address indexed user, string username, bytes32 profilePicture); function register(string _username, bytes32 _hashToProfilePicture) public { require(usernameExists[_username] == false || keccak256(abi.encodePacked(getUsername(msg.sender))) == keccak256(abi.encodePacked(_username)) ); if (usernameExists[getUsername(msg.sender)]) { // if he already had username, that username is free now usernameExists[getUsername(msg.sender)] = false; } else { numberOfUsers++; emit NewUser(msg.sender, _username, _hashToProfilePicture); } addressToUser[msg.sender] = User({ username: _username, hashToProfilePicture: _hashToProfilePicture, exists: true }); usernameExists[_username] = true; profilePictureExists[_hashToProfilePicture] = true; usernameToAddress[_username] = msg.sender; } function changeProfilePicture(bytes32 _hashToProfilePicture) public { require(addressToUser[msg.sender].exists, "User doesn't exists"); addressToUser[msg.sender].hashToProfilePicture = _hashToProfilePicture; } function getUserInfo(address _address) public view returns(string, bytes32) { User memory user = addressToUser[_address]; return (user.username, user.hashToProfilePicture); } function getUsername(address _address) public view returns(string) { return addressToUser[_address].username; } function getProfilePicture(address _address) public view returns(bytes32) { return addressToUser[_address].hashToProfilePicture; } function isUsernameExists(string _username) public view returns(bool) { return usernameExists[_username]; } } contract DigitalPrintImage is ERC721Token("DigitalPrintImage", "DPM"), UserManager, Ownable { struct ImageMetadata { uint finalSeed; bytes32[] potentialAssets; uint timestamp; address creator; string ipfsHash; string extraData; } mapping(uint => bool) public seedExists; mapping(uint => ImageMetadata) public imageMetadata; mapping(uint => string) public idToIpfsHash; address public marketplaceContract; IAssetManager public assetManager; Functions public functions; modifier onlyMarketplaceContract() { require(msg.sender == address(marketplaceContract)); _; } event ImageCreated(uint indexed imageId, address indexed owner); /// @dev only for testing purposes // function createImageTest() public { // _mint(msg.sender, totalSupply()); // } /// @notice Function will create new image /// @param _randomHashIds is array of random hashes from our array /// @param _timestamp is timestamp when image is created /// @param _iterations is number of how many times he generated random asset positions until he liked what he got /// @param _potentialAssets is set of all potential assets user selected for an image /// @param _author is nickname of image owner /// @param _ipfsHash is ipfsHash of the image .png /// @param _extraData string containing ipfsHash that contains (frame,width,height,title,description) /// @return returns id of created image function createImage( uint[] _randomHashIds, uint _timestamp, uint _iterations, bytes32[] _potentialAssets, string _author, string _ipfsHash, string _extraData) public payable { require(_potentialAssets.length <= 5); // if user exists send his username, if it doesn't check for some username that doesn't exists require(msg.sender == usernameToAddress[_author] || !usernameExists[_author]); // if user doesn't exists create that user with no profile picture if (!usernameExists[_author]) { register(_author, bytes32(0)); } uint[] memory pickedAssets; uint finalSeed; (pickedAssets, finalSeed) = getPickedAssetsAndFinalSeed(_potentialAssets, _randomHashIds, _timestamp, _iterations); uint[] memory pickedAssetPacks = assetManager.pickUniquePacks(pickedAssets); uint finalPrice = 0; for (uint i = 0; i < pickedAssetPacks.length; i++) { if (assetManager.checkHasPermissionForPack(msg.sender, pickedAssetPacks[i]) == false) { finalPrice += assetManager.getAssetPackPrice(pickedAssetPacks[i]); assetManager.buyAssetPack.value(assetManager.getAssetPackPrice(pickedAssetPacks[i]))(msg.sender, pickedAssetPacks[i]); } } require(msg.value >= finalPrice); uint id = totalSupply(); _mint(msg.sender, id); imageMetadata[id] = ImageMetadata({ finalSeed: finalSeed, potentialAssets: _potentialAssets, timestamp: _timestamp, creator: msg.sender, ipfsHash: _ipfsHash, extraData: _extraData }); idToIpfsHash[id] = _ipfsHash; seedExists[finalSeed] = true; emit ImageCreated(id, msg.sender); } /// @notice approving image to be taken from specific address /// @param _from address from which we transfer image /// @param _to address that we give permission to take image /// @param _imageId we are willing to give function transferFromMarketplace(address _from, address _to, uint256 _imageId) public onlyMarketplaceContract { require(isApprovedOrOwner(_from, _imageId)); clearApproval(_from, _imageId); removeTokenFrom(_from, _imageId); addTokenTo(_to, _imageId); emit Transfer(_from, _to, _imageId); } /// @notice adds marketplace address to contract only if it doesn't already exist /// @param _marketplaceContract address of marketplace contract function addMarketplaceContract(address _marketplaceContract) public onlyOwner { require(address(marketplaceContract) == 0x0); marketplaceContract = _marketplaceContract; } /// @notice Function to add assetManager /// @param _assetManager is address of assetManager contract function addAssetManager(address _assetManager) public onlyOwner { require(address(assetManager) == 0x0); assetManager = IAssetManager(_assetManager); } /// @notice Function to add functions contract /// @param _functions is address of functions contract function addFunctions(address _functions) public onlyOwner { require(address(functions) == 0x0); functions = Functions(_functions); } /// @notice Function to calculate final price for an image based on selected assets /// @param _pickedAssets is array of picked packs /// @param _owner is address of image owner /// @return finalPrice for the image function calculatePrice(uint[] _pickedAssets, address _owner) public view returns (uint) { if (_pickedAssets.length == 0) { return 0; } uint[] memory pickedAssetPacks = assetManager.pickUniquePacks(_pickedAssets); uint finalPrice = 0; for (uint i = 0; i < pickedAssetPacks.length; i++) { if (assetManager.checkHasPermissionForPack(_owner, pickedAssetPacks[i]) == false) { finalPrice += assetManager.getAssetPackPrice(pickedAssetPacks[i]); } } return finalPrice; } /// @notice Method returning informations needed for gallery page /// @param _imageId id of image function getGalleryData(uint _imageId) public view returns(address, address, string, bytes32, string, string) { require(_imageId < totalSupply()); return( imageMetadata[_imageId].creator, ownerOf(_imageId), addressToUser[ownerOf(_imageId)].username, addressToUser[ownerOf(_imageId)].hashToProfilePicture, imageMetadata[_imageId].ipfsHash, imageMetadata[_imageId].extraData ); } /// @notice returns metadata of image /// @dev not possible to use public mapping because of array of bytes32 /// @param _imageId id of image function getImageMetadata(uint _imageId) public view returns(address, string, uint, string, uint, bytes32[]) { ImageMetadata memory metadata = imageMetadata[_imageId]; return( metadata.creator, metadata.extraData, metadata.finalSeed, metadata.ipfsHash, metadata.timestamp, metadata.potentialAssets ); } /// @notice returns all images owned by _user /// @param _user address of user function getUserImages(address _user) public view returns(uint[]) { return ownedTokens[_user]; } /// @notice returns picked assets from potential assets and final seed /// @param _potentialAssets array of all potential assets encoded in bytes32 /// @param _randomHashIds selected random hash ids from our contract /// @param _timestamp timestamp of image creation /// @param _iterations number of iterations to get to final seed function getPickedAssetsAndFinalSeed(bytes32[] _potentialAssets, uint[] _randomHashIds, uint _timestamp, uint _iterations) internal view returns(uint[], uint) { uint finalSeed = uint(functions.getFinalSeed(functions.calculateSeed(_randomHashIds, _timestamp), _iterations)); require(!seedExists[finalSeed]); return (functions.pickRandomAssets(finalSeed, _potentialAssets), finalSeed); } }
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Contract Creation Code
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Swarm Source
bzzr://1f30051fd00f416e04d4c02e4951d7d1010134492d1c9b4461551f8d7a242749
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