ERC-721
Overview
Max Total Supply
218 MEH
Holders
29
Total Transfers
-
Market
Volume (24H)
N/A
Min Price (24H)
N/A
Max Price (24H)
N/A
Other Info
Token Contract
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Source Code Verified (Exact Match)
Contract Name:
MEH
Compiler Version
v0.4.24+commit.e67f0147
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity)
/** *Submitted for verification at Etherscan.io on 2018-09-05 */ pragma solidity ^0.4.24; // File: openzeppelin-solidity/contracts/introspection/ERC165.sol /** * @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); } // File: 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 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; } // File: 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() 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 { } // File: 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,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); } // File: 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) { // 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; } } // File: 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. // solium-disable-next-line security/no-inline-assembly assembly { size := extcodesize(_addr) } return size > 0; } } // File: openzeppelin-solidity/contracts/introspection/SupportsInterfaceWithLookup.sol /** * @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; } } // File: 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 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); } } // File: 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 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; } } // File: 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 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; } } // File: openzeppelin-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 make a function callable only when the contract is not paused. */ modifier whenNotPaused() { require(!paused); _; } /** * @dev Modifier to make a function callable only when the contract is paused. */ modifier whenPaused() { require(paused); _; } /** * @dev called by the owner to pause, triggers stopped state */ function pause() public onlyOwner whenNotPaused { paused = true; emit Pause(); } /** * @dev called by the owner to unpause, returns to normal state */ function unpause() public onlyOwner whenPaused { paused = false; emit Unpause(); } } // File: contracts/MEHAccessControl.sol contract MarketInerface { function buyBlocks(address, uint16[]) external returns (uint) {} function sellBlocks(address, uint, uint16[]) external returns (uint) {} function isMarket() public view returns (bool) {} function isOnSale(uint16) public view returns (bool) {} function areaPrice(uint16[]) public view returns (uint) {} function importOldMEBlock(uint8, uint8) external returns (uint, address) {} } contract RentalsInterface { function rentOutBlocks(address, uint, uint16[]) external returns (uint) {} function rentBlocks(address, uint, uint16[]) external returns (uint) {} function blocksRentPrice(uint, uint16[]) external view returns (uint) {} function isRentals() public view returns (bool) {} function isRented(uint16) public view returns (bool) {} function renterOf(uint16) public view returns (address) {} } contract AdsInterface { function advertiseOnBlocks(address, uint16[], string, string, string) external returns (uint) {} function canAdvertiseOnBlocks(address, uint16[]) public view returns (bool) {} function isAds() public view returns (bool) {} } /// @title MEHAccessControl: Part of MEH contract responsible for communication with external modules: /// Market, Rentals, Ads contracts. Provides authorization and upgradability methods. contract MEHAccessControl is Pausable { // Allows a module being plugged in to verify it is MEH contract. bool public isMEH = true; // Modules MarketInerface public market; RentalsInterface public rentals; AdsInterface public ads; // Emitted when a module is plugged. event LogModuleUpgrade(address newAddress, string moduleName); // GUARDS /// @dev Functions allowed to market module only. modifier onlyMarket() { require(msg.sender == address(market)); _; } /// @dev Functions allowed to balance operators only (market and rentals contracts are the /// only balance operators) modifier onlyBalanceOperators() { require(msg.sender == address(market) || msg.sender == address(rentals)); _; } // ** Admin set Access ** // /// @dev Allows admin to plug a new Market contract in. // credits to cryptokittes! - https://github.com/Lunyr/crowdsale-contracts/blob/cfadd15986c30521d8ba7d5b6f57b4fefcc7ac38/contracts/LunyrToken.sol#L117 // NOTE: verify that a contract is what we expect function adminSetMarket(address _address) external onlyOwner { MarketInerface candidateContract = MarketInerface(_address); require(candidateContract.isMarket()); market = candidateContract; emit LogModuleUpgrade(_address, "Market"); } /// @dev Allows admin to plug a new Rentals contract in. function adminSetRentals(address _address) external onlyOwner { RentalsInterface candidateContract = RentalsInterface(_address); require(candidateContract.isRentals()); rentals = candidateContract; emit LogModuleUpgrade(_address, "Rentals"); } /// @dev Allows admin to plug a new Ads contract in. function adminSetAds(address _address) external onlyOwner { AdsInterface candidateContract = AdsInterface(_address); require(candidateContract.isAds()); ads = candidateContract; emit LogModuleUpgrade(_address, "Ads"); } } // File: contracts/MehERC721.sol // ERC721 /// @title MehERC721: Part of MEH contract responsible for ERC721 token management. Openzeppelin's /// ERC721 implementation modified for the Million Ether Homepage. contract MehERC721 is ERC721Token("MillionEtherHomePage","MEH"), MEHAccessControl { /// @dev Checks rights to transfer block ownership. Locks tokens on sale. /// Overrides OpenZEppelin's isApprovedOrOwner function - so that tokens marked for sale can /// be transferred by Market contract only. function isApprovedOrOwner( address _spender, uint256 _tokenId ) internal view returns (bool) { bool onSale = market.isOnSale(uint16(_tokenId)); address owner = ownerOf(_tokenId); bool spenderIsApprovedOrOwner = _spender == owner || getApproved(_tokenId) == _spender || isApprovedForAll(owner, _spender); return ( (onSale && _spender == address(market)) || (!(onSale) && spenderIsApprovedOrOwner) ); } /// @dev mints a new block. /// overrides _mint function to add pause/unpause functionality, onlyMarket access, /// restricts totalSupply of blocks to 10000 (as there is only a 100x100 blocks field). function _mintCrowdsaleBlock(address _to, uint16 _blockId) external onlyMarket whenNotPaused { if (totalSupply() <= 9999) { _mint(_to, uint256(_blockId)); } } /// @dev overrides approve function to add pause/unpause functionality function approve(address _to, uint256 _tokenId) public whenNotPaused { super.approve(_to, _tokenId); } /// @dev overrides setApprovalForAll function to add pause/unpause functionality function setApprovalForAll(address _to, bool _approved) public whenNotPaused { super.setApprovalForAll(_to, _approved); } /// @dev overrides transferFrom function to add pause/unpause functionality /// affects safeTransferFrom functions as well function transferFrom( address _from, address _to, uint256 _tokenId ) public whenNotPaused { super.transferFrom(_from, _to, _tokenId); } } // File: contracts/Accounting.sol // import "../installed_contracts/math.sol"; // @title Accounting: Part of MEH contract responsible for eth accounting. contract Accounting is MEHAccessControl { using SafeMath for uint256; // Balances of users, admin, charity mapping(address => uint256) public balances; // Emitted when a user deposits or withdraws funds from the contract event LogContractBalance(address payerOrPayee, int balanceChange); // ** PAYMENT PROCESSING ** // /// @dev Withdraws users available balance. function withdraw() external whenNotPaused { address payee = msg.sender; uint256 payment = balances[payee]; require(payment != 0); assert(address(this).balance >= payment); balances[payee] = 0; // reentrancy safe payee.transfer(payment); emit LogContractBalance(payee, int256(-payment)); } /// @dev Lets external authorized contract (operators) to transfer balances within MEH contract. /// MEH contract doesn't transfer funds on its own. Instead Market and Rentals contracts /// are granted operator access. function operatorTransferFunds( address _payer, address _recipient, uint _amount) external onlyBalanceOperators whenNotPaused { require(balances[_payer] >= _amount); _deductFrom(_payer, _amount); _depositTo(_recipient, _amount); } /// @dev Deposits eth to msg.sender balance. function depositFunds() internal whenNotPaused { _depositTo(msg.sender, msg.value); emit LogContractBalance(msg.sender, int256(msg.value)); } /// @dev Increases recipients internal balance. function _depositTo(address _recipient, uint _amount) internal { balances[_recipient] = balances[_recipient].add(_amount); } /// @dev Increases payers internal balance. function _deductFrom(address _payer, uint _amount) internal { balances[_payer] = balances[_payer].sub(_amount); } // ** ADMIN ** // /// @notice Allows admin to withdraw contract balance in emergency. And distribute manualy /// aftrewards. /// @dev As the contract is not designed to keep users funds (users can withdraw /// at anytime) it should be relatively easy to manualy transfer unclaimed funds to /// their owners. This is an alternatinve to selfdestruct allowing blocks ledger (ERC721 tokens) /// to be immutable. function adminRescueFunds() external onlyOwner whenPaused { address payee = owner; uint256 payment = address(this).balance; payee.transfer(payment); } /// @dev Checks if a msg.sender has enough balance to pay the price _needed. function canPay(uint _needed) internal view returns (bool) { return (msg.value.add(balances[msg.sender]) >= _needed); } } // File: contracts/MEH.sol /* MillionEther smart contract - decentralized advertising platform. This program is free software: you can redistribute it and/or modifromY it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ /* * A 1000x1000 pixel field is displayed at TheMillionEtherHomepage.com. * This smart contract lets anyone buy 10x10 pixel blocks and place ads there. * It also allows to sell blocks and rent them out to other advertisers. * * 10x10 pixels blocks are addressed by xy coordinates. So 1000x1000 pixel field is 100 by 100 blocks. * Making up 10 000 blocks in total. Each block is an ERC721 (non fungible token) token. * * At the initial sale the price for each block is $1 (price is feeded by an oracle). After * every 1000 blocks sold (every 10%) the price doubles. Owners can sell and rent out blocks at any * price they want. Owners and renters can place and replace ads to their blocks as many times they * want. * * All heavy logic is delegated to external upgradable contracts. There are 4 main modules (contracts): * - MEH: Million Ether Homepage (MEH) contract. Provides user interface and accounting * functionality. It is immutable and it keeps Non fungible ERC721 tokens (10x10 pixel blocks) * ledger and eth balances. * - Market: Plugable. Provides methods for buy-sell functionality, keeps buy-sell ledger, * querries oracle for a ETH-USD price, * - Rentals: Plugable. Provides methods for rentout-rent functionality, keeps rentout-rent ledger. * - Ads: Plugable. Provides methods for image placement functionality. * */ /// @title MEH: Million Ether Homepage. Buy, sell, rent out pixels and place ads. /// @author Peter Porobov (https://keybase.io/peterporobov) /// @notice The main contract, accounting and user interface. Immutable. contract MEH is MehERC721, Accounting { /// @notice emited when an area blocks is bought event LogBuys( uint ID, uint8 fromX, uint8 fromY, uint8 toX, uint8 toY, address newLandlord ); /// @notice emited when an area blocks is marked for sale event LogSells( uint ID, uint8 fromX, uint8 fromY, uint8 toX, uint8 toY, uint sellPrice ); /// @notice emited when an area blocks is marked for rent event LogRentsOut( uint ID, uint8 fromX, uint8 fromY, uint8 toX, uint8 toY, uint rentPricePerPeriodWei ); /// @notice emited when an area blocks is rented event LogRents( uint ID, uint8 fromX, uint8 fromY, uint8 toX, uint8 toY, uint numberOfPeriods, uint rentedFrom ); /// @notice emited when an ad is placed to an area event LogAds(uint ID, uint8 fromX, uint8 fromY, uint8 toX, uint8 toY, string imageSourceUrl, string adUrl, string adText, address indexed advertiser); // ** BUY AND SELL BLOCKS ** // /// @notice lets a message sender to buy blocks within area /// @dev if using a contract to buy an area make sure to implement ERC721 functionality /// as tokens are transfered using "transferFrom" function and not "safeTransferFrom" /// in order to avoid external calls. function buyArea(uint8 fromX, uint8 fromY, uint8 toX, uint8 toY) external whenNotPaused payable { // check input parameters and eth deposited require(isLegalCoordinates(fromX, fromY, toX, toY)); require(canPay(areaPrice(fromX, fromY, toX, toY))); depositFunds(); // try to buy blocks through market contract // will get an id of buy-sell operation if succeeds (if all blocks available) uint id = market.buyBlocks(msg.sender, blocksList(fromX, fromY, toX, toY)); emit LogBuys(id, fromX, fromY, toX, toY, msg.sender); } /// @notice lets a message sender to mark blocks for sale at price set for each block in wei /// @dev (priceForEachBlockCents = 0 - not for sale) function sellArea(uint8 fromX, uint8 fromY, uint8 toX, uint8 toY, uint priceForEachBlockWei) external whenNotPaused { // check input parameters require(isLegalCoordinates(fromX, fromY, toX, toY)); // try to mark blocks for sale through market contract // will get an id of buy-sell operation if succeeds (if owns all blocks) uint id = market.sellBlocks( msg.sender, priceForEachBlockWei, blocksList(fromX, fromY, toX, toY) ); emit LogSells(id, fromX, fromY, toX, toY, priceForEachBlockWei); } /// @notice get area price in wei function areaPrice(uint8 fromX, uint8 fromY, uint8 toX, uint8 toY) public view returns (uint) { // check input require(isLegalCoordinates(fromX, fromY, toX, toY)); // querry areaPrice in wei at market contract return market.areaPrice(blocksList(fromX, fromY, toX, toY)); } // ** RENT OUT AND RENT BLOCKS ** // /// @notice Rent out an area of blocks at coordinates [fromX, fromY, toX, toY] at a price for /// each block in wei /// @dev if rentPricePerPeriodWei = 0 then makes area not available for rent function rentOutArea(uint8 fromX, uint8 fromY, uint8 toX, uint8 toY, uint rentPricePerPeriodWei) external whenNotPaused { // check input require(isLegalCoordinates(fromX, fromY, toX, toY)); // try to mark blocks as rented out through rentals contract // will get an id of rent-rentout operation if succeeds (if message sender owns blocks) uint id = rentals.rentOutBlocks( msg.sender, rentPricePerPeriodWei, blocksList(fromX, fromY, toX, toY) ); emit LogRentsOut(id, fromX, fromY, toX, toY, rentPricePerPeriodWei); } /// @notice Rent an area of blocks at coordinates [fromX, fromY, toX, toY] for a number of /// periods specified /// (period length is specified in rentals contract) function rentArea(uint8 fromX, uint8 fromY, uint8 toX, uint8 toY, uint numberOfPeriods) external payable whenNotPaused { // check input parameters and eth deposited // checks number of periods > 0 in rentals contract require(isLegalCoordinates(fromX, fromY, toX, toY)); require(canPay(areaRentPrice(fromX, fromY, toX, toY, numberOfPeriods))); depositFunds(); // try to rent blocks through rentals contract // will get an id of rent-rentout operation if succeeds (if all blocks available for rent) uint id = rentals.rentBlocks( msg.sender, numberOfPeriods, blocksList(fromX, fromY, toX, toY) ); emit LogRents(id, fromX, fromY, toX, toY, numberOfPeriods, 0); } /// @notice get area rent price in wei for number of periods specified /// (period length is specified in rentals contract) function areaRentPrice(uint8 fromX, uint8 fromY, uint8 toX, uint8 toY, uint numberOfPeriods) public view returns (uint) { // check input require(isLegalCoordinates(fromX, fromY, toX, toY)); // querry areaPrice in wei at rentals contract return rentals.blocksRentPrice (numberOfPeriods, blocksList(fromX, fromY, toX, toY)); } // ** PLACE ADS ** // /// @notice places ads (image, caption and link to a website) into desired coordinates /// @dev nothing is stored in any of the contracts except an image id. All other data is /// only emitted in event. Basicaly this function just verifies if an event is allowed /// to be emitted. function placeAds( uint8 fromX, uint8 fromY, uint8 toX, uint8 toY, string imageSource, string link, string text ) external whenNotPaused { // check input require(isLegalCoordinates(fromX, fromY, toX, toY)); // try to place ads through ads contract // will get an image id if succeeds (if advertiser owns or rents all blocks within area) uint AdsId = ads.advertiseOnBlocks( msg.sender, blocksList(fromX, fromY, toX, toY), imageSource, link, text ); emit LogAds(AdsId, fromX, fromY, toX, toY, imageSource, link, text, msg.sender); } /// @notice check if an advertiser is allowed to put ads within area (i.e. owns or rents all /// blocks) function canAdvertise( address advertiser, uint8 fromX, uint8 fromY, uint8 toX, uint8 toY ) external view returns (bool) { // check user input require(isLegalCoordinates(fromX, fromY, toX, toY)); // querry permission at ads contract return ads.canAdvertiseOnBlocks(advertiser, blocksList(fromX, fromY, toX, toY)); } // ** IMPORT BLOCKS ** // /// @notice import blocks from previous version Million Ether Homepage function adminImportOldMEBlock(uint8 x, uint8 y) external onlyOwner { (uint id, address newLandlord) = market.importOldMEBlock(x, y); emit LogBuys(id, x, y, x, y, newLandlord); } // ** INFO GETTERS ** // /// @notice get an owner(address) of block at a specified coordinates function getBlockOwner(uint8 x, uint8 y) external view returns (address) { return ownerOf(blockID(x, y)); } // ** UTILS ** // /// @notice get ERC721 token id corresponding to xy coordinates function blockID(uint8 x, uint8 y) public pure returns (uint16) { return (uint16(y) - 1) * 100 + uint16(x); } /// @notice get a number of blocks within area function countBlocks( uint8 fromX, uint8 fromY, uint8 toX, uint8 toY ) internal pure returns (uint16) { return (toX - fromX + 1) * (toY - fromY + 1); } /// @notice get an array of all block ids (i.e. ERC721 token ids) within area function blocksList( uint8 fromX, uint8 fromY, uint8 toX, uint8 toY ) internal pure returns (uint16[] memory r) { uint i = 0; r = new uint16[](countBlocks(fromX, fromY, toX, toY)); for (uint8 ix=fromX; ix<=toX; ix++) { for (uint8 iy=fromY; iy<=toY; iy++) { r[i] = blockID(ix, iy); i++; } } } /// @notice insures that area coordinates are within 100x100 field and /// from-coordinates >= to-coordinates /// @dev function is used instead of modifier as modifier /// required too much stack for placeImage and rentBlocks function isLegalCoordinates( uint8 _fromX, uint8 _fromY, uint8 _toX, uint8 _toY ) private pure returns (bool) { return ((_fromX >= 1) && (_fromY >=1) && (_toX <= 100) && (_toY <= 100) && (_fromX <= _toX) && (_fromY <= _toY)); } }
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Contract Creation Code
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Swarm Source
bzzr://27061fc3142458ddfcfff85a76ed2b0367409e3c38882485566fc64f90f1a36b
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