ERC-20
Overview
Max Total Supply
3,246 DAC
Holders
388
Market
Onchain Market Cap
$0.00
Circulating Supply Market Cap
-
Other Info
Token Contract (WITH 0 Decimals)
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
DigitalArtChain
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 2018-05-19 */ // File: node_modules\openzeppelin-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; event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); /** * @dev The Ownable constructor sets the original `owner` of the contract to the sender * account. */ function Ownable() 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 transfer control of the contract to a newOwner. * @param newOwner The address to transfer ownership to. */ function transferOwnership(address newOwner) public onlyOwner { require(newOwner != address(0)); emit OwnershipTransferred(owner, newOwner); owner = newOwner; } } // File: node_modules\openzeppelin-solidity\contracts\token\ERC721\ERC721Receiver.sol /** * @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,uint256,bytes)"))`, * which can be also obtained as `ERC721Receiver(0).onERC721Received.selector` */ bytes4 constant ERC721_RECEIVED = 0xf0b9e5ba; /** * @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. This function MUST use 50,000 gas or less. Return of other * than the magic value MUST result in the transaction being reverted. * Note: the contract address is always the message sender. * @param _from The sending address * @param _tokenId The NFT identifier which is being transfered * @param _data Additional data with no specified format * @return `bytes4(keccak256("onERC721Received(address,uint256,bytes)"))` */ function onERC721Received(address _from, uint256 _tokenId, bytes _data) public returns(bytes4); } // File: node_modules\openzeppelin-solidity\contracts\token\ERC721\ERC721Holder.sol contract ERC721Holder is ERC721Receiver { function onERC721Received(address, uint256, bytes) public returns(bytes4) { return ERC721_RECEIVED; } } // File: node_modules\openzeppelin-solidity\contracts\token\ERC721\ERC721Basic.sol /** * @title ERC721 Non-Fungible Token Standard basic interface * @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md */ contract ERC721Basic { event Transfer(address indexed _from, address indexed _to, uint256 _tokenId); event Approval(address indexed _owner, address indexed _approved, uint256 _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; } // File: node_modules\openzeppelin-solidity\contracts\token\ERC721\ERC721.sol /** * @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() public view returns (string _name); function symbol() public 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 { } // File: node_modules\openzeppelin-solidity\contracts\AddressUtils.sol /** * 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. assembly { size := extcodesize(addr) } // solium-disable-line security/no-inline-assembly return size > 0; } } // File: node_modules\openzeppelin-solidity\contracts\math\SafeMath.sol /** * @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) { 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; } } // File: node_modules\openzeppelin-solidity\contracts\token\ERC721\ERC721BasicToken.sol /** * @title ERC721 Non-Fungible Token Standard basic implementation * @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md */ contract ERC721BasicToken is ERC721Basic { using SafeMath for uint256; using AddressUtils for address; // Equals to `bytes4(keccak256("onERC721Received(address,uint256,bytes)"))` // which can be also obtained as `ERC721Receiver(0).onERC721Received.selector` bytes4 constant ERC721_RECEIVED = 0xf0b9e5ba; // 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; /** * @dev Guarantees msg.sender is owner of the given token * @param _tokenId uint256 ID of the token to validate its ownership belongs to msg.sender */ modifier onlyOwnerOf(uint256 _tokenId) { require(ownerOf(_tokenId) == msg.sender); _; } /** * @dev Checks msg.sender can transfer a token, by being owner, approved, or operator * @param _tokenId uint256 ID of the token to validate */ modifier canTransfer(uint256 _tokenId) { require(isApprovedOrOwner(msg.sender, _tokenId)); _; } /** * @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 existance 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 * @dev The zero address indicates there is no approved address. * @dev There can only be one approved address per token at a given time. * @dev 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)); if (getApproved(_tokenId) != address(0) || _to != address(0)) { 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 a 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 * @dev 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 * @dev Usage of this method is discouraged, use `safeTransferFrom` whenever possible * @dev 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 canTransfer(_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 * @dev 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,uint256,bytes)"))`; otherwise, * the transfer is reverted. * @dev 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 canTransfer(_tokenId) { // solium-disable-next-line arg-overflow safeTransferFrom(_from, _to, _tokenId, ""); } /** * @dev Safely transfers the ownership of a given token ID to another address * @dev 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,uint256,bytes)"))`; otherwise, * the transfer is reverted. * @dev 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 canTransfer(_tokenId) { 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); return _spender == owner || getApproved(_tokenId) == _spender || isApprovedForAll(owner, _spender); } /** * @dev Internal function to mint a new token * @dev 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 * @dev 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 * @dev 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); emit Approval(_owner, address(0), _tokenId); } } /** * @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 * @dev 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(_from, _tokenId, _data); return (retval == ERC721_RECEIVED); } } // File: node_modules\openzeppelin-solidity\contracts\token\ERC721\ERC721Token.sol /** * @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 ERC721, ERC721BasicToken { // 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 */ function ERC721Token(string _name, string _symbol) public { name_ = _name; symbol_ = _symbol; } /** * @dev Gets the token name * @return string representing the token name */ function name() public view returns (string) { return name_; } /** * @dev Gets the token symbol * @return string representing the token symbol */ function symbol() public view returns (string) { return symbol_; } /** * @dev Returns an URI for a given token ID * @dev 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 * @dev 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 * @dev 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); uint256 tokenIndex = ownedTokensIndex[_tokenId]; uint256 lastTokenIndex = ownedTokens[_from].length.sub(1); uint256 lastToken = ownedTokens[_from][lastTokenIndex]; ownedTokens[_from][tokenIndex] = lastToken; ownedTokens[_from][lastTokenIndex] = 0; // 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 ownedTokens[_from].length--; ownedTokensIndex[_tokenId] = 0; ownedTokensIndex[lastToken] = tokenIndex; } /** * @dev Internal function to mint a new token * @dev 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 * @dev 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; } } // File: contracts\Integers.sol /** * Integers Library * * In summary this is a simple library of integer functions which allow a simple * conversion to and from strings * * @author James Lockhart <[email protected]> */ library Integers { /** * Parse Int * * Converts an ASCII string value into an uint as long as the string * its self is a valid unsigned integer * * @param _value The ASCII string to be converted to an unsigned integer * @return uint The unsigned value of the ASCII string */ function parseInt(string _value) public returns (uint _ret) { bytes memory _bytesValue = bytes(_value); uint j = 1; for(uint i = _bytesValue.length-1; i >= 0 && i < _bytesValue.length; i--) { assert(_bytesValue[i] >= 48 && _bytesValue[i] <= 57); _ret += (uint(_bytesValue[i]) - 48)*j; j*=10; } } /** * To String * * Converts an unsigned integer to the ASCII string equivalent value * * @param _base The unsigned integer to be converted to a string * @return string The resulting ASCII string value */ function toString(uint _base) internal returns (string) { if (_base==0){ return "0"; } bytes memory _tmp = new bytes(32); uint i; for(i = 0;_base > 0;i++) { _tmp[i] = byte((_base % 10) + 48); _base /= 10; } bytes memory _real = new bytes(i--); for(uint j = 0; j < _real.length; j++) { _real[j] = _tmp[i--]; } return string(_real); } /** * To Byte * * Convert an 8 bit unsigned integer to a byte * * @param _base The 8 bit unsigned integer * @return byte The byte equivalent */ function toByte(uint8 _base) public returns (byte _ret) { assembly { let m_alloc := add(msize(),0x1) mstore8(m_alloc, _base) _ret := mload(m_alloc) } } /** * To Bytes * * Converts an unsigned integer to bytes * * @param _base The integer to be converted to bytes * @return bytes The bytes equivalent */ function toBytes(uint _base) internal returns (bytes _ret) { assembly { let m_alloc := add(msize(),0x1) _ret := mload(m_alloc) mstore(_ret, 0x20) mstore(add(_ret, 0x20), _base) } } } // File: contracts\Strings.sol /** * Strings Library * * In summary this is a simple library of string functions which make simple * string operations less tedious in solidity. * * Please be aware these functions can be quite gas heavy so use them only when * necessary not to clog the blockchain with expensive transactions. * * @author James Lockhart <[email protected]> */ library Strings { /** * Concat (High gas cost) * * Appends two strings together and returns a new value * * @param _base When being used for a data type this is the extended object * otherwise this is the string which will be the concatenated * prefix * @param _value The value to be the concatenated suffix * @return string The resulting string from combinging the base and value */ function concat(string _base, string _value) internal returns (string) { bytes memory _baseBytes = bytes(_base); bytes memory _valueBytes = bytes(_value); assert(_valueBytes.length > 0); string memory _tmpValue = new string(_baseBytes.length + _valueBytes.length); bytes memory _newValue = bytes(_tmpValue); uint i; uint j; for(i = 0; i < _baseBytes.length; i++) { _newValue[j++] = _baseBytes[i]; } for(i = 0; i<_valueBytes.length; i++) { _newValue[j++] = _valueBytes[i]; } return string(_newValue); } /** * Index Of * * Locates and returns the position of a character within a string * * @param _base When being used for a data type this is the extended object * otherwise this is the string acting as the haystack to be * searched * @param _value The needle to search for, at present this is currently * limited to one character * @return int The position of the needle starting from 0 and returning -1 * in the case of no matches found */ function indexOf(string _base, string _value) internal returns (int) { return _indexOf(_base, _value, 0); } /** * Index Of * * Locates and returns the position of a character within a string starting * from a defined offset * * @param _base When being used for a data type this is the extended object * otherwise this is the string acting as the haystack to be * searched * @param _value The needle to search for, at present this is currently * limited to one character * @param _offset The starting point to start searching from which can start * from 0, but must not exceed the length of the string * @return int The position of the needle starting from 0 and returning -1 * in the case of no matches found */ function _indexOf(string _base, string _value, uint _offset) internal returns (int) { bytes memory _baseBytes = bytes(_base); bytes memory _valueBytes = bytes(_value); assert(_valueBytes.length == 1); for(uint i = _offset; i < _baseBytes.length; i++) { if (_baseBytes[i] == _valueBytes[0]) { return int(i); } } return -1; } /** * Length * * Returns the length of the specified string * * @param _base When being used for a data type this is the extended object * otherwise this is the string to be measured * @return uint The length of the passed string */ function length(string _base) internal returns (uint) { bytes memory _baseBytes = bytes(_base); return _baseBytes.length; } /** * Sub String * * Extracts the beginning part of a string based on the desired length * * @param _base When being used for a data type this is the extended object * otherwise this is the string that will be used for * extracting the sub string from * @param _length The length of the sub string to be extracted from the base * @return string The extracted sub string */ function substring(string _base, int _length) internal returns (string) { return _substring(_base, _length, 0); } /** * Sub String * * Extracts the part of a string based on the desired length and offset. The * offset and length must not exceed the lenth of the base string. * * @param _base When being used for a data type this is the extended object * otherwise this is the string that will be used for * extracting the sub string from * @param _length The length of the sub string to be extracted from the base * @param _offset The starting point to extract the sub string from * @return string The extracted sub string */ function _substring(string _base, int _length, int _offset) internal returns (string) { bytes memory _baseBytes = bytes(_base); assert(uint(_offset+_length) <= _baseBytes.length); string memory _tmp = new string(uint(_length)); bytes memory _tmpBytes = bytes(_tmp); uint j = 0; for(uint i = uint(_offset); i < uint(_offset+_length); i++) { _tmpBytes[j++] = _baseBytes[i]; } return string(_tmpBytes); } /** * String Split (Very high gas cost) * * Splits a string into an array of strings based off the delimiter value. * Please note this can be quite a gas expensive function due to the use of * storage so only use if really required. * * @param _base When being used for a data type this is the extended object * otherwise this is the string value to be split. * @param _value The delimiter to split the string on which must be a single * character * @return string[] An array of values split based off the delimiter, but * do not container the delimiter. */ function split(string _base, string _value) internal returns (string[] storage splitArr) { bytes memory _baseBytes = bytes(_base); uint _offset = 0; while(_offset < _baseBytes.length-1) { int _limit = _indexOf(_base, _value, _offset); if (_limit == -1) { _limit = int(_baseBytes.length); } string memory _tmp = new string(uint(_limit)-_offset); bytes memory _tmpBytes = bytes(_tmp); uint j = 0; for(uint i = _offset; i < uint(_limit); i++) { _tmpBytes[j++] = _baseBytes[i]; } _offset = uint(_limit) + 1; splitArr.push(string(_tmpBytes)); } return splitArr; } /** * Compare To * * Compares the characters of two strings, to ensure that they have an * identical footprint * * @param _base When being used for a data type this is the extended object * otherwise this is the string base to compare against * @param _value The string the base is being compared to * @return bool Simply notates if the two string have an equivalent */ function compareTo(string _base, string _value) internal returns (bool) { bytes memory _baseBytes = bytes(_base); bytes memory _valueBytes = bytes(_value); if (_baseBytes.length != _valueBytes.length) { return false; } for(uint i = 0; i < _baseBytes.length; i++) { if (_baseBytes[i] != _valueBytes[i]) { return false; } } return true; } /** * Compare To Ignore Case (High gas cost) * * Compares the characters of two strings, converting them to the same case * where applicable to alphabetic characters to distinguish if the values * match. * * @param _base When being used for a data type this is the extended object * otherwise this is the string base to compare against * @param _value The string the base is being compared to * @return bool Simply notates if the two string have an equivalent value * discarding case */ function compareToIgnoreCase(string _base, string _value) internal returns (bool) { bytes memory _baseBytes = bytes(_base); bytes memory _valueBytes = bytes(_value); if (_baseBytes.length != _valueBytes.length) { return false; } for(uint i = 0; i < _baseBytes.length; i++) { if (_baseBytes[i] != _valueBytes[i] && _upper(_baseBytes[i]) != _upper(_valueBytes[i])) { return false; } } return true; } /** * Upper * * Converts all the values of a string to their corresponding upper case * value. * * @param _base When being used for a data type this is the extended object * otherwise this is the string base to convert to upper case * @return string */ function upper(string _base) internal returns (string) { bytes memory _baseBytes = bytes(_base); for (uint i = 0; i < _baseBytes.length; i++) { _baseBytes[i] = _upper(_baseBytes[i]); } return string(_baseBytes); } /** * Lower * * Converts all the values of a string to their corresponding lower case * value. * * @param _base When being used for a data type this is the extended object * otherwise this is the string base to convert to lower case * @return string */ function lower(string _base) internal returns (string) { bytes memory _baseBytes = bytes(_base); for (uint i = 0; i < _baseBytes.length; i++) { _baseBytes[i] = _lower(_baseBytes[i]); } return string(_baseBytes); } /** * Upper * * Convert an alphabetic character to upper case and return the original * value when not alphabetic * * @param _b1 The byte to be converted to upper case * @return bytes1 The converted value if the passed value was alphabetic * and in a lower case otherwise returns the original value */ function _upper(bytes1 _b1) private constant returns (bytes1) { if (_b1 >= 0x61 && _b1 <= 0x7A) { return bytes1(uint8(_b1)-32); } return _b1; } /** * Lower * * Convert an alphabetic character to lower case and return the original * value when not alphabetic * * @param _b1 The byte to be converted to lower case * @return bytes1 The converted value if the passed value was alphabetic * and in a upper case otherwise returns the original value */ function _lower(bytes1 _b1) private constant returns (bytes1) { if (_b1 >= 0x41 && _b1 <= 0x5A) { return bytes1(uint8(_b1)+32); } return _b1; } } // File: contracts\DigitalArtChain.sol contract DigitalArtChain is Ownable, ERC721Token, ERC721Holder { using Strings for string; using Integers for uint; function DigitalArtChain () ERC721Token("DigitalArtChain" ,"DAC") public { } struct DigitalArt { string ipfsHash; address publisher; } DigitalArt[] public digitalArts; mapping (string => uint256) ipfsHashToTokenId; mapping (address => uint256) internal publishedTokensCount; mapping (address => uint256[]) internal publishedTokens; mapping(address => mapping (uint256 => uint256)) internal publishedTokensIndex; struct SellingItem { address seller; uint128 price; } mapping (uint256 => SellingItem) public tokenIdToSellingItem; uint128 public createDigitalArtFee = 0.00198 ether; uint128 public publisherCut = 500; string preUri1 = "http://api.digitalartchain.com/tokens?tokenId="; string preUri2 = "&ipfsHash="; /*** Modifier ***/ modifier onlyOwner() { require(msg.sender == owner); _; } /*** Owner Action ***/ function withdraw() public onlyOwner { owner.transfer(this.balance); } function setCreateDigitalArtFee(uint128 _fee) public onlyOwner { createDigitalArtFee = _fee; } function setPublisherCut(uint128 _cut) public onlyOwner { require(_cut > 0 && _cut < 10000); publisherCut = _cut; } function setPreUri1(string _preUri) public onlyOwner { preUri1 = _preUri; } function setPreUri2(string _preUri) public onlyOwner { preUri2 = _preUri; } function getIpfsHashToTokenId(string _string) public view returns (uint256){ return ipfsHashToTokenId[_string]; } function getOwnedTokens(address _owner) public view returns (uint256[]) { return ownedTokens[_owner]; } function getAllTokens() public view returns (uint256[]) { return allTokens; } function publishedCountOf(address _publisher) public view returns (uint256) { return publishedTokensCount[_publisher]; } function publishedTokenOfOwnerByIndex(address _publisher, uint256 _index) public view returns (uint256) { require(_index < publishedCountOf(_publisher)); return publishedTokens[_publisher][_index]; } function getPublishedTokens(address _publisher) public view returns (uint256[]) { return publishedTokens[_publisher]; } function mintDigitalArt(string _ipfsHash) public payable { require(msg.value == createDigitalArtFee); require(ipfsHashToTokenId[_ipfsHash] == 0); DigitalArt memory _digitalArt = DigitalArt({ipfsHash: _ipfsHash, publisher: msg.sender}); uint256 newDigitalArtId = digitalArts.push(_digitalArt) - 1; ipfsHashToTokenId[_ipfsHash] = newDigitalArtId; _mint(msg.sender, newDigitalArtId); publishedTokensCount[msg.sender]++; uint256 length = publishedTokens[msg.sender].length; publishedTokens[msg.sender].push(newDigitalArtId); publishedTokensIndex[msg.sender][newDigitalArtId] = length; } function tokenURI(uint256 _tokenId) public view returns (string) { require(exists(_tokenId)); return preUri1.concat(_tokenId.toString()).concat(preUri2).concat(digitalArts[_tokenId].ipfsHash); } function addDigitalArtSellingItem(uint256 _tokenId, uint128 _price) public onlyOwnerOf(_tokenId) { require(tokenIdToSellingItem[_tokenId].seller == address(0)); SellingItem memory _sellingItem = SellingItem(msg.sender, uint128(_price)); tokenIdToSellingItem[_tokenId] = _sellingItem; approve(address(this), _tokenId); safeTransferFrom(msg.sender, address(this), _tokenId); } function cancelDigitalArtSellingItem(uint256 _tokenId) public { require(tokenIdToSellingItem[_tokenId].seller == msg.sender); this.safeTransferFrom(address(this), tokenIdToSellingItem[_tokenId].seller, _tokenId); delete tokenIdToSellingItem[_tokenId]; } function purchaseDigitalArtSellingItem(uint256 _tokenId) public payable { require(tokenIdToSellingItem[_tokenId].seller != address(0)); require(tokenIdToSellingItem[_tokenId].seller != msg.sender); require(tokenIdToSellingItem[_tokenId].price == msg.value); SellingItem memory sellingItem = tokenIdToSellingItem[_tokenId]; if (sellingItem.price > 0) { uint128 actualPublisherCut = _computePublisherCut(sellingItem.price); uint128 proceeds = sellingItem.price - actualPublisherCut; sellingItem.seller.transfer(proceeds); digitalArts[_tokenId].publisher.transfer(actualPublisherCut); } delete tokenIdToSellingItem[_tokenId]; this.safeTransferFrom(address(this), msg.sender, _tokenId); } /*** Tools ***/ function _computePublisherCut(uint128 _price) internal view returns (uint128) { return _price * publisherCut / 10000; } }
Contract Security Audit
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Contract Creation Code
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Swarm Source
bzzr://a7ece9f69b41e906666cf13f1aea7a4bb46567d1c12b7ff092fb2c649d09ac59
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