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Latest 25 from a total of 1,336 transactions
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Swap | 16971722 | 531 days ago | IN | 0 ETH | 0.00217717 | ||||
Swap | 16971720 | 531 days ago | IN | 0 ETH | 0.00227993 | ||||
Swap | 16855016 | 547 days ago | IN | 0 ETH | 0.00168399 | ||||
Swap | 16854985 | 547 days ago | IN | 0 ETH | 0.0017448 | ||||
Swap | 16601649 | 583 days ago | IN | 0 ETH | 0.00222285 | ||||
Swap | 16482902 | 599 days ago | IN | 0 ETH | 0.00137763 | ||||
Swap | 16482891 | 599 days ago | IN | 0 ETH | 0.00143594 | ||||
Swap | 16482891 | 599 days ago | IN | 0 ETH | 0.00143594 | ||||
Swap | 16405430 | 610 days ago | IN | 0 ETH | 0.00147655 | ||||
Swap | 16286413 | 627 days ago | IN | 0 ETH | 0.00160093 | ||||
Swap | 16242540 | 633 days ago | IN | 0 ETH | 0.00208245 | ||||
Swap | 16240074 | 633 days ago | IN | 0 ETH | 0.00114054 | ||||
Swap | 16011196 | 665 days ago | IN | 0 ETH | 0.0012307 | ||||
Swap | 15979471 | 670 days ago | IN | 0 ETH | 0.00188186 | ||||
Swap | 15886045 | 683 days ago | IN | 0 ETH | 0.00150339 | ||||
Swap | 15731220 | 704 days ago | IN | 0 ETH | 0.00136485 | ||||
Swap | 15708711 | 708 days ago | IN | 0 ETH | 0.00238554 | ||||
Swap | 15704208 | 708 days ago | IN | 0 ETH | 0.00084378 | ||||
Swap | 15673968 | 712 days ago | IN | 0 ETH | 0.00076321 | ||||
Swap | 15652860 | 715 days ago | IN | 0 ETH | 0.0006168 | ||||
Swap | 15638456 | 717 days ago | IN | 0 ETH | 0.00078021 | ||||
Swap | 15638452 | 717 days ago | IN | 0 ETH | 0.00080023 | ||||
Swap | 15638439 | 717 days ago | IN | 0 ETH | 0.00084578 | ||||
Swap | 15631126 | 718 days ago | IN | 0 ETH | 0.00102757 | ||||
Swap | 15631123 | 718 days ago | IN | 0 ETH | 0.00100354 |
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Contract Name:
DragonSwapper
Compiler Version
v0.8.0+commit.c7dfd78e
Optimization Enabled:
No with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: GPL-3.0-only pragma solidity ^0.8.0; import "@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol"; import "@openzeppelin/contracts/token/ERC721/ERC721.sol"; import "@openzeppelin/contracts/utils/Address.sol"; import "../access/BaseAccessControl.sol"; import "../structs/DragonInfo.sol"; import "../DragonToken.sol"; contract DragonSwapper is BaseAccessControl, IERC721Receiver { using Address for address payable; string public constant OWNER_ERROR = "DragonSwapper: caller is not owner"; string public constant BAD_AMOUNT_ERROR = "DragonSwapper: bad amount"; string public constant BAD_ADDRESS_ERROR = "DragonSwapper: bad address"; string public constant NOT_VALID_OPERATOR_ERROR = "DragonSwapper: the caller is not a valid operator"; address private _tokenContractAddress; address private _burnAddress; uint private _swapPrice; mapping(uint => address) private _lockedTokens; event TokenLocked(address indexed owner, uint tokenId, uint dragonValue, address polygonTo); event TokenUnlocked(address indexed owner, uint tokenId); event TokenBurned(uint tokenId); event EthersWithdrawn(address indexed operator, address indexed to, uint amount); constructor(uint price, address accessControl, address tokenContractAddress, address burnAddr) BaseAccessControl(accessControl) { _swapPrice = price; _tokenContractAddress = tokenContractAddress; _burnAddress = burnAddr; } function burnAddress() public view returns (address) { return _burnAddress; } function tokenContract() public view returns (address) { return _tokenContractAddress; } function setTokenContract(address newAddress) external onlyRole(COO_ROLE) { address previousAddress = _tokenContractAddress; _tokenContractAddress = newAddress; emit AddressChanged("tokenContract", previousAddress, newAddress); } function swapPrice() public view returns (uint) { return _swapPrice; } function setSwapPrice(uint newPrice) external onlyRole(CFO_ROLE) { uint previousValue = _swapPrice; _swapPrice = newPrice; emit ValueChanged("swapPrice", previousValue, newPrice); } function onERC721Received(address operator, address /*from*/, uint /*tokenId*/, bytes calldata /*data*/) external virtual override returns (bytes4) { require(operator == address(this), NOT_VALID_OPERATOR_ERROR); return this.onERC721Received.selector; } function swap(uint tokenId, address polygonTo) payable external { DragonToken dt = DragonToken(tokenContract()); require(msg.value >= swapPrice(), BAD_AMOUNT_ERROR); require(dt.ownerOf(tokenId) == _msgSender(), OWNER_ERROR); require(!Address.isContract(polygonTo), BAD_ADDRESS_ERROR); dt.safeTransferFrom(_msgSender(), address(this), tokenId); DragonInfo.Details memory details = dt.dragonInfo(tokenId); _lockedTokens[tokenId] = _msgSender(); emit TokenLocked(_msgSender(), tokenId, DragonInfo.getValue(details), polygonTo); } function unlock(uint tokenId) external onlyRole(COO_ROLE) { address owner = _lockedTokens[tokenId]; if (owner != address(0)) { DragonToken dt = DragonToken(tokenContract()); dt.safeTransferFrom(address(this), owner, tokenId); delete _lockedTokens[tokenId]; emit TokenUnlocked(owner, tokenId); } } function burn(uint tokenId) external onlyRole(COO_ROLE) { address owner = _lockedTokens[tokenId]; if (owner != address(0)) { DragonToken dt = DragonToken(tokenContract()); dt.safeTransferFrom(address(this), burnAddress(), tokenId); delete _lockedTokens[tokenId]; emit TokenBurned(tokenId); } } function withdrawEthers(uint amount, address payable to) external onlyRole(CFO_ROLE) { to.sendValue(amount); emit EthersWithdrawn(_msgSender(), to, amount); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @title ERC721 token receiver interface * @dev Interface for any contract that wants to support safeTransfers * from ERC721 asset contracts. */ interface IERC721Receiver { /** * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom} * by `operator` from `from`, this function is called. * * It must return its Solidity selector to confirm the token transfer. * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted. * * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`. */ function onERC721Received( address operator, address from, uint256 tokenId, bytes calldata data ) external returns (bytes4); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./IERC721.sol"; import "./IERC721Receiver.sol"; import "./extensions/IERC721Metadata.sol"; import "../../utils/Address.sol"; import "../../utils/Context.sol"; import "../../utils/Strings.sol"; import "../../utils/introspection/ERC165.sol"; /** * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including * the Metadata extension, but not including the Enumerable extension, which is available separately as * {ERC721Enumerable}. */ contract ERC721 is Context, ERC165, IERC721, IERC721Metadata { using Address for address; using Strings for uint256; // Token name string private _name; // Token symbol string private _symbol; // Mapping from token ID to owner address mapping(uint256 => address) private _owners; // Mapping owner address to token count mapping(address => uint256) private _balances; // Mapping from token ID to approved address mapping(uint256 => address) private _tokenApprovals; // Mapping from owner to operator approvals mapping(address => mapping(address => bool)) private _operatorApprovals; /** * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection. */ constructor(string memory name_, string memory symbol_) { _name = name_; _symbol = symbol_; } /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) { return interfaceId == type(IERC721).interfaceId || interfaceId == type(IERC721Metadata).interfaceId || super.supportsInterface(interfaceId); } /** * @dev See {IERC721-balanceOf}. */ function balanceOf(address owner) public view virtual override returns (uint256) { require(owner != address(0), "ERC721: balance query for the zero address"); return _balances[owner]; } /** * @dev See {IERC721-ownerOf}. */ function ownerOf(uint256 tokenId) public view virtual override returns (address) { address owner = _owners[tokenId]; require(owner != address(0), "ERC721: owner query for nonexistent token"); return owner; } /** * @dev See {IERC721Metadata-name}. */ function name() public view virtual override returns (string memory) { return _name; } /** * @dev See {IERC721Metadata-symbol}. */ function symbol() public view virtual override returns (string memory) { return _symbol; } /** * @dev See {IERC721Metadata-tokenURI}. */ function tokenURI(uint256 tokenId) public view virtual override returns (string memory) { require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token"); string memory baseURI = _baseURI(); return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : ""; } /** * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each * token will be the concatenation of the `baseURI` and the `tokenId`. Empty * by default, can be overriden in child contracts. */ function _baseURI() internal view virtual returns (string memory) { return ""; } /** * @dev See {IERC721-approve}. */ function approve(address to, uint256 tokenId) public virtual override { address owner = ERC721.ownerOf(tokenId); require(to != owner, "ERC721: approval to current owner"); require( _msgSender() == owner || isApprovedForAll(owner, _msgSender()), "ERC721: approve caller is not owner nor approved for all" ); _approve(to, tokenId); } /** * @dev See {IERC721-getApproved}. */ function getApproved(uint256 tokenId) public view virtual override returns (address) { require(_exists(tokenId), "ERC721: approved query for nonexistent token"); return _tokenApprovals[tokenId]; } /** * @dev See {IERC721-setApprovalForAll}. */ function setApprovalForAll(address operator, bool approved) public virtual override { require(operator != _msgSender(), "ERC721: approve to caller"); _operatorApprovals[_msgSender()][operator] = approved; emit ApprovalForAll(_msgSender(), operator, approved); } /** * @dev See {IERC721-isApprovedForAll}. */ function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) { return _operatorApprovals[owner][operator]; } /** * @dev See {IERC721-transferFrom}. */ function transferFrom( address from, address to, uint256 tokenId ) public virtual override { //solhint-disable-next-line max-line-length require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved"); _transfer(from, to, tokenId); } /** * @dev See {IERC721-safeTransferFrom}. */ function safeTransferFrom( address from, address to, uint256 tokenId ) public virtual override { safeTransferFrom(from, to, tokenId, ""); } /** * @dev See {IERC721-safeTransferFrom}. */ function safeTransferFrom( address from, address to, uint256 tokenId, bytes memory _data ) public virtual override { require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved"); _safeTransfer(from, to, tokenId, _data); } /** * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients * are aware of the ERC721 protocol to prevent tokens from being forever locked. * * `_data` is additional data, it has no specified format and it is sent in call to `to`. * * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g. * implement alternative mechanisms to perform token transfer, such as signature-based. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must exist and be owned by `from`. * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. * * Emits a {Transfer} event. */ function _safeTransfer( address from, address to, uint256 tokenId, bytes memory _data ) internal virtual { _transfer(from, to, tokenId); require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer"); } /** * @dev Returns whether `tokenId` exists. * * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}. * * Tokens start existing when they are minted (`_mint`), * and stop existing when they are burned (`_burn`). */ function _exists(uint256 tokenId) internal view virtual returns (bool) { return _owners[tokenId] != address(0); } /** * @dev Returns whether `spender` is allowed to manage `tokenId`. * * Requirements: * * - `tokenId` must exist. */ function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) { require(_exists(tokenId), "ERC721: operator query for nonexistent token"); address owner = ERC721.ownerOf(tokenId); return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender)); } /** * @dev Safely mints `tokenId` and transfers it to `to`. * * Requirements: * * - `tokenId` must not exist. * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. * * Emits a {Transfer} event. */ function _safeMint(address to, uint256 tokenId) internal virtual { _safeMint(to, tokenId, ""); } /** * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is * forwarded in {IERC721Receiver-onERC721Received} to contract recipients. */ function _safeMint( address to, uint256 tokenId, bytes memory _data ) internal virtual { _mint(to, tokenId); require( _checkOnERC721Received(address(0), to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer" ); } /** * @dev Mints `tokenId` and transfers it to `to`. * * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible * * Requirements: * * - `tokenId` must not exist. * - `to` cannot be the zero address. * * Emits a {Transfer} event. */ function _mint(address to, uint256 tokenId) internal virtual { require(to != address(0), "ERC721: mint to the zero address"); require(!_exists(tokenId), "ERC721: token already minted"); _beforeTokenTransfer(address(0), to, tokenId); _balances[to] += 1; _owners[tokenId] = to; emit Transfer(address(0), to, tokenId); } /** * @dev Destroys `tokenId`. * The approval is cleared when the token is burned. * * Requirements: * * - `tokenId` must exist. * * Emits a {Transfer} event. */ function _burn(uint256 tokenId) internal virtual { address owner = ERC721.ownerOf(tokenId); _beforeTokenTransfer(owner, address(0), tokenId); // Clear approvals _approve(address(0), tokenId); _balances[owner] -= 1; delete _owners[tokenId]; emit Transfer(owner, address(0), tokenId); } /** * @dev Transfers `tokenId` from `from` to `to`. * As opposed to {transferFrom}, this imposes no restrictions on msg.sender. * * Requirements: * * - `to` cannot be the zero address. * - `tokenId` token must be owned by `from`. * * Emits a {Transfer} event. */ function _transfer( address from, address to, uint256 tokenId ) internal virtual { require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer of token that is not own"); require(to != address(0), "ERC721: transfer to the zero address"); _beforeTokenTransfer(from, to, tokenId); // Clear approvals from the previous owner _approve(address(0), tokenId); _balances[from] -= 1; _balances[to] += 1; _owners[tokenId] = to; emit Transfer(from, to, tokenId); } /** * @dev Approve `to` to operate on `tokenId` * * Emits a {Approval} event. */ function _approve(address to, uint256 tokenId) internal virtual { _tokenApprovals[tokenId] = to; emit Approval(ERC721.ownerOf(tokenId), to, tokenId); } /** * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address. * The call is not executed if the target address is not a contract. * * @param from address representing the previous owner of the given token ID * @param to target address that will receive the tokens * @param tokenId uint256 ID of the token to be transferred * @param _data bytes optional data to send along with the call * @return bool whether the call correctly returned the expected magic value */ function _checkOnERC721Received( address from, address to, uint256 tokenId, bytes memory _data ) private returns (bool) { if (to.isContract()) { try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) { return retval == IERC721Receiver.onERC721Received.selector; } catch (bytes memory reason) { if (reason.length == 0) { revert("ERC721: transfer to non ERC721Receiver implementer"); } else { assembly { revert(add(32, reason), mload(reason)) } } } } else { return true; } } /** * @dev Hook that is called before any token transfer. This includes minting * and burning. * * Calling conditions: * * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be * transferred to `to`. * - When `from` is zero, `tokenId` will be minted for `to`. * - When `to` is zero, ``from``'s `tokenId` will be burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer( address from, address to, uint256 tokenId ) internal virtual {} }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev Collection of functions related to the address type */ library Address { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize, which returns 0 for contracts in // construction, since the code is only stored at the end of the // constructor execution. uint256 size; assembly { size := extcodesize(account) } return size > 0; } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); (bool success, ) = recipient.call{value: amount}(""); require(success, "Address: unable to send value, recipient may have reverted"); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain `call` is an unsafe replacement for a function call: use this * function instead. * * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * * Requirements: * * - `target` must be a contract. * - calling `target` with `data` must not revert. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data) internal returns (bytes memory) { return functionCall(target, data, "Address: low-level call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with * `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but also transferring `value` wei to `target`. * * Requirements: * * - the calling contract must have an ETH balance of at least `value`. * - the called Solidity function must be `payable`. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value ) internal returns (bytes memory) { return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); } /** * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but * with `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value, string memory errorMessage ) internal returns (bytes memory) { require(address(this).balance >= value, "Address: insufficient balance for call"); require(isContract(target), "Address: call to non-contract"); (bool success, bytes memory returndata) = target.call{value: value}(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) { return functionStaticCall(target, data, "Address: low-level static call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall( address target, bytes memory data, string memory errorMessage ) internal view returns (bytes memory) { require(isContract(target), "Address: static call to non-contract"); (bool success, bytes memory returndata) = target.staticcall(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) { return functionDelegateCall(target, data, "Address: low-level delegate call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { require(isContract(target), "Address: delegate call to non-contract"); (bool success, bytes memory returndata) = target.delegatecall(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the * revert reason using the provided one. * * _Available since v4.3._ */ function verifyCallResult( bool success, bytes memory returndata, string memory errorMessage ) internal pure returns (bytes memory) { if (success) { return returndata; } else { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
// SPDX-License-Identifier: GPL-3.0-only pragma solidity ^0.8.0; import "@openzeppelin/contracts/access/IAccessControl.sol"; import "@openzeppelin/contracts/utils/Context.sol"; import "@openzeppelin/contracts/utils/Strings.sol"; import "../interfaces/IChangeableVariables.sol"; abstract contract BaseAccessControl is Context, IChangeableVariables { bytes32 public constant CEO_ROLE = keccak256("CEO"); bytes32 public constant CFO_ROLE = keccak256("CFO"); bytes32 public constant COO_ROLE = keccak256("COO"); address private _accessControl; modifier onlyRole(bytes32 role) { _checkRole(role, _msgSender()); _; } constructor (address accessControl) Context() { _accessControl = accessControl; } function accessControlAddress() public view returns (address) { return _accessControl; } function setAccessControlAddress(address newAddress) external onlyRole(COO_ROLE) { address previousAddress = _accessControl; _accessControl = newAddress; emit AddressChanged("accessControl", previousAddress, newAddress); } function hasRole(bytes32 role, address account) public view returns (bool) { IAccessControl accessControl = IAccessControl(accessControlAddress()); return accessControl.hasRole(role, account) || accessControl.hasRole(CEO_ROLE, account); } function _checkRole(bytes32 role, address account) internal view { if (!hasRole(role, account)) { revert( string( abi.encodePacked( "AccessControl: account ", Strings.toHexString(uint160(account), 20), " is missing role ", Strings.toHexString(uint256(role), 32) ) ) ); } } }
// SPDX-License-Identifier: GPL-3.0-only pragma solidity ^0.8.0; library DragonInfo { uint constant MASK = 0xF000000000000000000000000; enum Types { Unknown, Common, Rare16, Rare17, Rare18, Rare19, Epic20, Epic21, Epic22, Epic23, Epic24, Legendary } struct Details { uint genes; uint eggId; uint parent1Id; uint parent2Id; uint generation; uint strength; Types dragonType; } function getDetails(uint value) internal pure returns (Details memory) { return Details ( { genes: uint256(uint104(value)), parent1Id: uint256(uint32(value >> 104)), parent2Id: uint256(uint32(value >> 136)), generation: uint256(uint16(value >> 168)), strength: uint256(uint16(value >> 184)), dragonType: Types(uint16(value >> 200)), eggId: uint256(uint32(value >> 216)) } ); } function getValue(Details memory details) internal pure returns (uint) { uint result = uint(details.genes); result |= details.parent1Id << 104; result |= details.parent2Id << 136; result |= details.generation << 168; result |= details.strength << 184; result |= uint(details.dragonType) << 200; result |= details.eggId << 216; return result; } function calcType(uint genes) internal pure returns (Types) { uint mask = MASK; uint numRare = 0; uint numEpic = 0; for (uint i = 0; i < 10; i++) { //just Rare and Epic genes are important to check if (genes & mask > 0) { if (i < 5) { //Epic-range numEpic++; } else { //Rare-range numRare++; } } mask = mask >> 4; } Types result = Types.Unknown; if (numEpic == 5 && numRare == 5) { result = Types.Legendary; } else if (numEpic < 5 && numRare == 5) { result = Types(6 + numEpic); } else if (numEpic == 0 && numRare < 5) { result = Types(1 + numRare); } else if (numEpic == 0 && numRare == 0) { result = Types.Common; } return result; } function calcStrength(uint genes) internal pure returns (uint) { uint mask = MASK; uint strength = 0; for (uint i = 0; i < 25; i++) { uint gLevel = (genes & mask) >> ((24 - i) * 4); if (i < 6) { //Epic strength += 3 * (25 - i) * gLevel; } else if (i < 10) { //Rare strength += 2 * (25 - i) * gLevel; } else { //Common-range if (gLevel > 0) { strength += (25 - i) * gLevel; } else { strength += (25 - i); } } mask = mask >> 4; } return strength; } function calcGeneration(uint g1, uint g2) internal pure returns (uint) { return (g1 >= g2 ? g1 : g2) + 1; } }
// SPDX-License-Identifier: GPL-3.0-only pragma solidity ^0.8.0; import "@openzeppelin/contracts/token/ERC721/ERC721.sol"; import "@openzeppelin/contracts/utils/Address.sol"; import "@openzeppelin/contracts/utils/Counters.sol"; import "./access/BaseAccessControl.sol"; import "./structs/DragonInfo.sol"; contract DragonToken is ERC721, BaseAccessControl { using Address for address; using Counters for Counters.Counter; string public constant NONEXISTENT_TOKEN_ERROR = "DragonToken: nonexistent token"; string public constant NOT_ENOUGH_PRIVILEGES_ERROR = "DragonToken: not enough privileges to call the method"; string public constant DRAGON_EXISTS_ERROR = "DragonToken: a dragon with such ID already exists"; string public constant BAD_CID_ERROR = "DragonToken: bad CID"; string public constant CID_SET_ERROR = "DragonToken: CID is already set"; Counters.Counter private _dragonIds; // Mapping token id to dragon details mapping(uint => uint) private _info; // Mapping token id to cid mapping(uint => string) private _cids; string private _defaultMetadataCid; address private _dragonCreator; address private _dragonReplicator; constructor(uint dragonSeed, string memory defaultCid, address accessControl) ERC721("CryptoDragons", "CD") BaseAccessControl(accessControl) { _dragonIds = Counters.Counter({ _value: dragonSeed }); _defaultMetadataCid = defaultCid; } function approveAndCall(address spender, uint256 tokenId, bytes calldata extraData) external returns (bool success) { require(_exists(tokenId), NONEXISTENT_TOKEN_ERROR); _approve(spender, tokenId); (bool _success, ) = spender.call( abi.encodeWithSignature("receiveApproval(address,uint256,address,bytes)", _msgSender(), tokenId, address(this), extraData) ); if(!_success) { revert("DragonToken: spender internal error"); } return true; } function tokenURI(uint tokenId) public view virtual override returns (string memory) { require(_exists(tokenId), NONEXISTENT_TOKEN_ERROR); string memory cid = _cids[tokenId]; return string(abi.encodePacked("ipfs://", (bytes(cid).length > 0) ? cid : defaultMetadataCid())); } function dragonCreatorAddress() public view returns(address) { return _dragonCreator; } function setDragonCreatorAddress(address newAddress) external onlyRole(COO_ROLE) { address previousAddress = _dragonCreator; _dragonCreator = newAddress; emit AddressChanged("dragonCreator", previousAddress, newAddress); } function dragonReplicatorAddress() public view returns(address) { return _dragonReplicator; } function setDragonReplicatorAddress(address newAddress) external onlyRole(COO_ROLE) { address previousAddress = _dragonReplicator; _dragonReplicator = newAddress; emit AddressChanged("dragonReplicator", previousAddress, newAddress); } function hasMetadataCid(uint tokenId) public view returns(bool) { require(_exists(tokenId), NONEXISTENT_TOKEN_ERROR); return bytes(_cids[tokenId]).length > 0; } function setMetadataCid(uint tokenId, string calldata cid) external onlyRole(COO_ROLE) { require(_exists(tokenId), NONEXISTENT_TOKEN_ERROR); require(bytes(cid).length >= 46, BAD_CID_ERROR); require(!hasMetadataCid(tokenId), CID_SET_ERROR); _cids[tokenId] = cid; } function defaultMetadataCid() public view returns (string memory){ return _defaultMetadataCid; } function setDefaultMetadataCid(string calldata newDefaultCid) external onlyRole(COO_ROLE) { _defaultMetadataCid = newDefaultCid; } function dragonInfo(uint dragonId) public view returns (DragonInfo.Details memory) { require(_exists(dragonId), NONEXISTENT_TOKEN_ERROR); return DragonInfo.getDetails(_info[dragonId]); } function strengthOf(uint dragonId) external view returns (uint) { DragonInfo.Details memory details = dragonInfo(dragonId); return details.strength > 0 ? details.strength : DragonInfo.calcStrength(details.genes); } function isSiblings(uint dragon1Id, uint dragon2Id) external view returns (bool) { DragonInfo.Details memory info1 = dragonInfo(dragon1Id); DragonInfo.Details memory info2 = dragonInfo(dragon2Id); return (info1.generation > 1 && info2.generation > 1) && //the 1st generation of dragons doesn't have siblings (info1.parent1Id == info2.parent1Id || info1.parent1Id == info2.parent2Id || info1.parent2Id == info2.parent1Id || info1.parent2Id == info2.parent2Id); } function isParent(uint dragon1Id, uint dragon2Id) external view returns (bool) { DragonInfo.Details memory info = dragonInfo(dragon1Id); return info.parent1Id == dragon2Id || info.parent2Id == dragon2Id; } function mint(address to, DragonInfo.Details calldata info) external returns (uint) { require(_msgSender() == dragonCreatorAddress(), NOT_ENOUGH_PRIVILEGES_ERROR); _dragonIds.increment(); uint newDragonId = uint(_dragonIds.current()); _info[newDragonId] = DragonInfo.getValue(info); _mint(to, newDragonId); return newDragonId; } function mintReplica(address to, uint dragonId, uint value, string memory cid) external returns (uint) { require(_msgSender() == dragonReplicatorAddress(), NOT_ENOUGH_PRIVILEGES_ERROR); require(_info[dragonId] == 0, DRAGON_EXISTS_ERROR); _info[dragonId] = value; _cids[dragonId] = cid; _mint(to, dragonId); return dragonId; } function setStrength(uint dragonId) external returns (uint) { DragonInfo.Details memory details = dragonInfo(dragonId); if (details.strength == 0) { details.strength = DragonInfo.calcStrength(details.genes); _info[dragonId] = DragonInfo.getValue(details); } return details.strength; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../../utils/introspection/IERC165.sol"; /** * @dev Required interface of an ERC721 compliant contract. */ interface IERC721 is IERC165 { /** * @dev Emitted when `tokenId` token is transferred from `from` to `to`. */ event Transfer(address indexed from, address indexed to, uint256 indexed tokenId); /** * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token. */ event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId); /** * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets. */ event ApprovalForAll(address indexed owner, address indexed operator, bool approved); /** * @dev Returns the number of tokens in ``owner``'s account. */ function balanceOf(address owner) external view returns (uint256 balance); /** * @dev Returns the owner of the `tokenId` token. * * Requirements: * * - `tokenId` must exist. */ function ownerOf(uint256 tokenId) external view returns (address owner); /** * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients * are aware of the ERC721 protocol to prevent tokens from being forever locked. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must exist and be owned by `from`. * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}. * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. * * Emits a {Transfer} event. */ function safeTransferFrom( address from, address to, uint256 tokenId ) external; /** * @dev Transfers `tokenId` token from `from` to `to`. * * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must be owned by `from`. * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}. * * Emits a {Transfer} event. */ function transferFrom( address from, address to, uint256 tokenId ) external; /** * @dev Gives permission to `to` to transfer `tokenId` token to another account. * The approval is cleared when the token is transferred. * * Only a single account can be approved at a time, so approving the zero address clears previous approvals. * * Requirements: * * - The caller must own the token or be an approved operator. * - `tokenId` must exist. * * Emits an {Approval} event. */ function approve(address to, uint256 tokenId) external; /** * @dev Returns the account approved for `tokenId` token. * * Requirements: * * - `tokenId` must exist. */ function getApproved(uint256 tokenId) external view returns (address operator); /** * @dev Approve or remove `operator` as an operator for the caller. * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller. * * Requirements: * * - The `operator` cannot be the caller. * * Emits an {ApprovalForAll} event. */ function setApprovalForAll(address operator, bool _approved) external; /** * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`. * * See {setApprovalForAll} */ function isApprovedForAll(address owner, address operator) external view returns (bool); /** * @dev Safely transfers `tokenId` token from `from` to `to`. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must exist and be owned by `from`. * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}. * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. * * Emits a {Transfer} event. */ function safeTransferFrom( address from, address to, uint256 tokenId, bytes calldata data ) external; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../IERC721.sol"; /** * @title ERC-721 Non-Fungible Token Standard, optional metadata extension * @dev See https://eips.ethereum.org/EIPS/eip-721 */ interface IERC721Metadata is IERC721 { /** * @dev Returns the token collection name. */ function name() external view returns (string memory); /** * @dev Returns the token collection symbol. */ function symbol() external view returns (string memory); /** * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token. */ function tokenURI(uint256 tokenId) external view returns (string memory); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ abstract contract Context { function _msgSender() internal view virtual returns (address) { return msg.sender; } function _msgData() internal view virtual returns (bytes calldata) { return msg.data; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev String operations. */ library Strings { bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef"; /** * @dev Converts a `uint256` to its ASCII `string` decimal representation. */ function toString(uint256 value) internal pure returns (string memory) { // Inspired by OraclizeAPI's implementation - MIT licence // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol if (value == 0) { return "0"; } uint256 temp = value; uint256 digits; while (temp != 0) { digits++; temp /= 10; } bytes memory buffer = new bytes(digits); while (value != 0) { digits -= 1; buffer[digits] = bytes1(uint8(48 + uint256(value % 10))); value /= 10; } return string(buffer); } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation. */ function toHexString(uint256 value) internal pure returns (string memory) { if (value == 0) { return "0x00"; } uint256 temp = value; uint256 length = 0; while (temp != 0) { length++; temp >>= 8; } return toHexString(value, length); } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length. */ function toHexString(uint256 value, uint256 length) internal pure returns (string memory) { bytes memory buffer = new bytes(2 * length + 2); buffer[0] = "0"; buffer[1] = "x"; for (uint256 i = 2 * length + 1; i > 1; --i) { buffer[i] = _HEX_SYMBOLS[value & 0xf]; value >>= 4; } require(value == 0, "Strings: hex length insufficient"); return string(buffer); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./IERC165.sol"; /** * @dev Implementation of the {IERC165} interface. * * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check * for the additional interface id that will be supported. For example: * * ```solidity * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) { * return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId); * } * ``` * * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation. */ abstract contract ERC165 is IERC165 { /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) { return interfaceId == type(IERC165).interfaceId; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev Interface of the ERC165 standard, as defined in the * https://eips.ethereum.org/EIPS/eip-165[EIP]. * * Implementers can declare support of contract interfaces, which can then be * queried by others ({ERC165Checker}). * * For an implementation, see {ERC165}. */ interface IERC165 { /** * @dev Returns true if this contract implements the interface defined by * `interfaceId`. See the corresponding * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section] * to learn more about how these ids are created. * * This function call must use less than 30 000 gas. */ function supportsInterface(bytes4 interfaceId) external view returns (bool); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev External interface of AccessControl declared to support ERC165 detection. */ interface IAccessControl { /** * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole` * * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite * {RoleAdminChanged} not being emitted signaling this. * * _Available since v3.1._ */ event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole); /** * @dev Emitted when `account` is granted `role`. * * `sender` is the account that originated the contract call, an admin role * bearer except when using {AccessControl-_setupRole}. */ event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender); /** * @dev Emitted when `account` is revoked `role`. * * `sender` is the account that originated the contract call: * - if using `revokeRole`, it is the admin role bearer * - if using `renounceRole`, it is the role bearer (i.e. `account`) */ event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender); /** * @dev Returns `true` if `account` has been granted `role`. */ function hasRole(bytes32 role, address account) external view returns (bool); /** * @dev Returns the admin role that controls `role`. See {grantRole} and * {revokeRole}. * * To change a role's admin, use {AccessControl-_setRoleAdmin}. */ function getRoleAdmin(bytes32 role) external view returns (bytes32); /** * @dev Grants `role` to `account`. * * If `account` had not been already granted `role`, emits a {RoleGranted} * event. * * Requirements: * * - the caller must have ``role``'s admin role. */ function grantRole(bytes32 role, address account) external; /** * @dev Revokes `role` from `account`. * * If `account` had been granted `role`, emits a {RoleRevoked} event. * * Requirements: * * - the caller must have ``role``'s admin role. */ function revokeRole(bytes32 role, address account) external; /** * @dev Revokes `role` from the calling account. * * Roles are often managed via {grantRole} and {revokeRole}: this function's * purpose is to provide a mechanism for accounts to lose their privileges * if they are compromised (such as when a trusted device is misplaced). * * If the calling account had been granted `role`, emits a {RoleRevoked} * event. * * Requirements: * * - the caller must be `account`. */ function renounceRole(bytes32 role, address account) external; }
// SPDX-License-Identifier: GPL-3.0-only pragma solidity ^0.8.0; interface IChangeableVariables { event AddressChanged(string fieldName, address previousAddress, address newAddress); event ValueChanged(string fieldName, uint previousValue, uint newValue); event BoolValueChanged(string fieldName, bool previousValue, bool newValue); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @title Counters * @author Matt Condon (@shrugs) * @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number * of elements in a mapping, issuing ERC721 ids, or counting request ids. * * Include with `using Counters for Counters.Counter;` */ library Counters { struct Counter { // This variable should never be directly accessed by users of the library: interactions must be restricted to // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add // this feature: see https://github.com/ethereum/solidity/issues/4637 uint256 _value; // default: 0 } function current(Counter storage counter) internal view returns (uint256) { return counter._value; } function increment(Counter storage counter) internal { unchecked { counter._value += 1; } } function decrement(Counter storage counter) internal { uint256 value = counter._value; require(value > 0, "Counter: decrement overflow"); unchecked { counter._value = value - 1; } } function reset(Counter storage counter) internal { counter._value = 0; } }
{ "optimizer": { "enabled": false, "runs": 200 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } }, "libraries": {} }
Contract Security Audit
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Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000c713a40aa9bff56aee0e8ff9542b758d83af9fea0000000000000000000000003943cf9bd3aca41a66ec911a6395727db274856e000000000000000000000000068376f1a6ecb4c398fafc300712b212d11fa531
-----Decoded View---------------
Arg [0] : price (uint256): 0
Arg [1] : accessControl (address): 0xc713A40AA9bfF56aeE0E8fF9542b758d83af9fEa
Arg [2] : tokenContractAddress (address): 0x3943cF9BD3ACA41a66eC911A6395727DB274856E
Arg [3] : burnAddr (address): 0x068376F1a6ECb4C398FAFC300712b212D11FA531
-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [1] : 000000000000000000000000c713a40aa9bff56aee0e8ff9542b758d83af9fea
Arg [2] : 0000000000000000000000003943cf9bd3aca41a66ec911a6395727db274856e
Arg [3] : 000000000000000000000000068376f1a6ecb4c398fafc300712b212d11fa531
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Multichain Portfolio | 27 Chains
Chain | Token | Portfolio % | Price | Amount | Value |
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.