Ski Friends

//*********************************************************************//
//*********************************************************************//                                                    
//  
//       
//       8888888b.         d8888 888b     d888 8888888b.  8888888b.  
//       888   Y88b       d88888 8888b   d8888 888   Y88b 888   Y88b 
//       888    888      d88P888 88888b.d88888 888    888 888    888 
//       888   d88P     d88P 888 888Y88888P888 888   d88P 888   d88P 
//       8888888P"     d88P  888 888 Y888P 888 8888888P"  8888888P"  
//       888 T88b     d88P   888 888  Y8P  888 888        888        
//       888  T88b   d8888888888 888   "   888 888        888        
//       888   T88b d88P     888 888       888 888        888        
//       v1.0.0
//     
//                                                               
//    This project and smart contract was generated by rampp.xyz.
//            Rampp allows creators like you to launch 
//             large scale NFT projects without code!
//
//    Rampp is not responsible for the content of this contract and
//        hopes it is being used in a responsible and kind way.                                                         
//             Twitter: @RamppDAO ---- rampp.xyz
//    
//*********************************************************************//                                                     
//*********************************************************************// 



    
    // File: contracts/common/meta-transactions/Initializable.sol

    pragma solidity ^ 0.8.0;

    contract Initializable {
      bool inited = false;

      modifier initializer() {
        require(!inited, "already inited");
        _;
        inited = true;
      }
    }

    // File: contracts/common/meta-transactions/EIP712Base.sol



    pragma solidity ^ 0.8.0;


    contract EIP712Base is Initializable {
        struct EIP712Domain {
          string name;
          string version;
          address verifyingContract;
          bytes32 salt;
        }

        string public constant ERC712_VERSION = "1";

        bytes32 internal constant EIP712_DOMAIN_TYPEHASH =
      keccak256(
        bytes(
          "EIP712Domain(string name,string version,address verifyingContract,bytes32 salt)"
        )
      );
        bytes32 internal domainSeperator;

    // supposed to be called once while initializing.
    // one of the contracts that inherits this contract follows proxy pattern
    // so it is not possible to do this in a constructor
    function _initializeEIP712(string memory name) internal initializer {
      _setDomainSeperator(name);
    }

    function _setDomainSeperator(string memory name) internal {
      domainSeperator = keccak256(
        abi.encode(
          EIP712_DOMAIN_TYPEHASH,
          keccak256(bytes(name)),
          keccak256(bytes(ERC712_VERSION)),
          address(this),
          bytes32(getChainId())
        )
      );
    }

    function getDomainSeperator() public view returns(bytes32) {
      return domainSeperator;
    }

    function getChainId() public view returns(uint256) {
            uint256 id;
            assembly {
        id:= chainid()
      }
      return id;
    }

    /**
     * Accept message hash and returns hash message in EIP712 compatible form
     * So that it can be used to recover signer from signature signed using EIP712 formatted data
     * https://eips.ethereum.org/EIPS/eip-712
     * "\x19" makes the encoding deterministic
     * "\x01" is the version byte to make it compatible to EIP-191
     */
    function toTypedMessageHash(bytes32 messageHash)
    internal
    view
    returns(bytes32)
    {
      return
      keccak256(
        abi.encodePacked("\x19\x01", getDomainSeperator(), messageHash)
      );
    }
  }

// File: contracts/common/meta-transactions/ContentMixin.sol



pragma solidity ^ 0.8.0;

abstract contract ContextMixin {
  function msgSender() internal view returns(address payable sender) {
    if (msg.sender == address(this)) {
              bytes memory array = msg.data;
              uint256 index = msg.data.length;
              assembly {
        // Load the 32 bytes word from memory with the address on the lower 20 bytes, and mask those.
        sender:= and(
          mload(add(array, index)),
          0xffffffffffffffffffffffffffffffffffffffff
        )
      }
    } else {
      sender = payable(msg.sender);
    }
    return sender;
  }
}

// File: @openzeppelin/contracts/utils/math/SafeMath.sol



pragma solidity ^ 0.8.0;

  // CAUTION
  // This version of SafeMath should only be used with Solidity 0.8 or later,
  // because it relies on the compiler's built in overflow checks.

    /**
     * @dev Wrappers over Solidity's arithmetic operations.
     *
     * NOTE: 'SafeMath' is no longer needed starting with Solidity 0.8. The compiler
     * now has built in overflow checking.
     */
    library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns(bool, uint256) {
            unchecked {
                uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
      }
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns(bool, uint256) {
            unchecked {
        if (b > a) return (false, 0);
        return (true, a - b);
      }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns(bool, uint256) {
            unchecked {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
                uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
      }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns(bool, uint256) {
            unchecked {
        if (b == 0) return (false, 0);
        return (true, a / b);
      }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns(bool, uint256) {
            unchecked {
        if (b == 0) return (false, 0);
        return (true, a % b);
      }
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's '+' operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns(uint256) {
      return a + b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's '- ' operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns(uint256) {
      return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's '* ' operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns(uint256) {
      return a * b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's '/ ' operator.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns(uint256) {
      return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's '% ' operator. This function uses a 'revert'
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns(uint256) {
      return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's '- ' operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(
      uint256 a,
      uint256 b,
      string memory errorMessage
    ) internal pure returns(uint256) {
            unchecked {
        require(b <= a, errorMessage);
        return a - b;
      }
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's '/ ' operator. Note: this function uses a
     * 'revert' opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(
      uint256 a,
      uint256 b,
      string memory errorMessage
    ) internal pure returns(uint256) {
            unchecked {
        require(b > 0, errorMessage);
        return a / b;
      }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's '% ' operator. This function uses a 'revert'
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(
      uint256 a,
      uint256 b,
      string memory errorMessage
    ) internal pure returns(uint256) {
            unchecked {
        require(b > 0, errorMessage);
        return a % b;
      }
    }
  }

    // File: contracts/common/meta-transactions/NativeMetaTransaction.sol



    pragma solidity ^ 0.8.0;



    contract NativeMetaTransaction is EIP712Base {
        using SafeMath for uint256;
      bytes32 private constant META_TRANSACTION_TYPEHASH =
        keccak256(
          bytes(
            "MetaTransaction(uint256 nonce,address from,bytes functionSignature)"
          )
        );
        event MetaTransactionExecuted(
          address userAddress,
          address payable relayerAddress,
          bytes functionSignature
        );
    mapping(address => uint256) nonces;

        /*
        * Meta transaction structure.
        * No point of including value field here as if user is doing value transfer then he has the funds to pay for gas
        * He should call the desired function directly in that case.
        */
        struct MetaTransaction {
            uint256 nonce;
            address from;
            bytes functionSignature;
    }

    function executeMetaTransaction(
      address userAddress,
      bytes memory functionSignature,
      bytes32 sigR,
      bytes32 sigS,
      uint8 sigV
    ) public payable returns(bytes memory) {
            MetaTransaction memory metaTx = MetaTransaction({
      nonce: nonces[userAddress],
      from: userAddress,
      functionSignature: functionSignature
    });

      require(
        verify(userAddress, metaTx, sigR, sigS, sigV),
        "Signer and signature do not match"
      );

      // increase nonce for user (to avoid re-use)
      nonces[userAddress] = nonces[userAddress].add(1);

            emit MetaTransactionExecuted(
        userAddress,
        payable(msg.sender),
        functionSignature
      );

      // Append userAddress and relayer address at the end to extract it from calling context
      (bool success, bytes memory returnData) = address(this).call(
        abi.encodePacked(functionSignature, userAddress)
      );
      require(success, "Function call not successful");

      return returnData;
    }

    function hashMetaTransaction(MetaTransaction memory metaTx)
    internal
    pure
    returns(bytes32)
    {
      return
      keccak256(
        abi.encode(
          META_TRANSACTION_TYPEHASH,
          metaTx.nonce,
          metaTx.from,
          keccak256(metaTx.functionSignature)
        )
      );
    }

    function getNonce(address user) public view returns(uint256 nonce) {
      nonce = nonces[user];
    }

    function verify(
      address signer,
      MetaTransaction memory metaTx,
      bytes32 sigR,
      bytes32 sigS,
      uint8 sigV
    ) internal view returns(bool) {
      require(signer != address(0), "NativeMetaTransaction: INVALID_SIGNER");
      return
      signer ==
        ecrecover(
          toTypedMessageHash(hashMetaTransaction(metaTx)),
          sigV,
          sigR,
          sigS
        );
    }
  }

    // File: @openzeppelin/contracts/utils/Strings.sol



    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);
    }
  }

    // File: @openzeppelin/contracts/utils/Context.sol



    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;
    }
  }

    // File: @openzeppelin/contracts/access/Ownable.sol



    pragma solidity ^ 0.8.0;


    /**
     * @dev Contract module which provides a basic access control mechanism, where
     * there is an account (an owner) that can be granted exclusive access to
     * specific functions.
     *
     * By default, the owner account will be the one that deploys the contract. This
     * can later be changed with {transferOwnership}.
     *
     * This module is used through inheritance. It will make available the modifier
     * 'onlyOwner', which can be applied to your functions to restrict their use to
     * the owner.
     */
     abstract contract Ownable is Context {
      address private _owner;
  
      event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
  
      /**
       * @dev Initializes the contract setting the deployer as the initial owner.
       */
      constructor() {
          _setOwner(_msgSender());
      }
  
      /**
       * @dev Returns the address of the current owner.
       */
      function owner() public view virtual returns (address) {
          return _owner;
      }
  
      /**
       * @dev Throws if called by any account other than the owner.
       */
      modifier onlyOwner() {
          require(owner() == _msgSender(), "Ownable: caller is not the owner");
          _;
      }
     
      /**
       * @dev Leaves the contract without owner. It will not be possible to call
       * 'onlyOwner' functions anymore. Can only be called by the current owner.
       *
       * NOTE: Renouncing ownership will leave the contract without an owner,
       * thereby removing any functionality that is only available to the owner.
       */
      
      function renounceOwnership() public virtual onlyOwner {
        _setOwner(address(0));
      }
  
      /**
       * @dev Transfers ownership of the contract to a new account ('newOwner').
       * Can only be called by the current owner.
       */
      function transferOwnership(address newOwner) public virtual onlyOwner {
          require(newOwner != address(0), "Ownable: new owner is the zero address");
          _setOwner(newOwner);
      }
      
      function _setOwner(address newOwner) private {
          address oldOwner = _owner;
          _owner = newOwner;
          emit OwnershipTransferred(oldOwner, newOwner);
      }
    }

    // File: @openzeppelin/contracts/utils/Address.sol

    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);
        }
      }
    }
  }

// File: @openzeppelin/contracts/token/ERC721/IERC721Receiver.sol



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);
}

// File: @openzeppelin/contracts/utils/introspection/IERC165.sol



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);
    }

// File: @openzeppelin/contracts/utils/introspection/ERC165.sol



pragma solidity ^ 0.8.0;


/**
 * @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;
  }
}

// File: @openzeppelin/contracts/token/ERC721/IERC721.sol



pragma solidity ^ 0.8.0;


/**
 * @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;
}


// File: @openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol



pragma solidity ^ 0.8.0;


/**
 * @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);
}

// File: @openzeppelin/contracts/utils/Counters.sol


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;
    }
}



// File: @openzeppelin/contracts/token/ERC721/ERC721.sol



pragma solidity ^ 0.8.0;



/**
 * @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 { }
}


 
    
    // File: contracts/ERC721Tradable.sol
    pragma solidity ^0.8.0;

    contract OwnableDelegateProxy {}

    contract ProxyRegistry {
        mapping(address => OwnableDelegateProxy) public proxies;
    }

    /**
     * @title ERC721Tradable
     * ERC721Tradable - ERC721 contract that whitelists a trading address, and has minting functionality.
     */
    abstract contract ERC721Tradable is
        ContextMixin,
        ERC721,
        NativeMetaTransaction,
        Ownable
        
    {
        using SafeMath for uint256;
        using Counters for Counters.Counter;

        Counters.Counter private _tokenSupply;
        address proxyRegistryAddress;
        address public RAMPPADDRESS = 0xa9dAC8f3aEDC55D0FE707B86B8A45d246858d2E1;
        bool public mintingOpen = true;
        uint256 public SUPPLYCAP = 1000;
        uint256 public PRICE = 0.01 ether;
        address[] public payableAddresses = [RAMPPADDRESS];
        uint256[] public payableFees = [5];
        uint256 public payableAddressCount = 2;
        
        

        constructor(
            string memory _name,
            string memory _symbol,
            address _proxyRegistryAddress
        ) ERC721(_name, _symbol) {
            proxyRegistryAddress = _proxyRegistryAddress;
            // Establish user-defined payableAddresses and amounts
            payableAddresses.push(0x68372a4d01e4261A5D60D81EABfF6f712d09b7bd);
            payableFees.push(uint256(95));
    
            _initializeEIP712(_name);
        }
        
        modifier isRampp() {
            require(msg.sender == RAMPPADDRESS, "Ownable: caller is not RAMPP");
            _;
        }

        
        /**
        * @dev Mints a token to an address with a tokenURI.
        * This is owner only and allows a fee-free drop
        * @param _to address of the future owner of the token
        */
        function mintToAdmin(address _to) public onlyOwner {
            require(_getNextTokenId() <= SUPPLYCAP, "Cannot mint over supply cap of 1000");
            uint256 newTokenId = _getNextTokenId();
            _mint(_to, newTokenId);
            _incrementTokenId();
        }

        function mintToBulkAdmin(address[] memory addresses, uint256 addressCount) public onlyOwner {
            for(uint i=0; i < addressCount; i++ ) {
                mintToAdmin(addresses[i]);
            }
        }
    
        
        /**
         * @dev Mints a token to an address with a tokenURI.
         * fee may or may not be required*
         * @param _to address of the future owner of the token
         */
        function mintTo(address _to) public payable {
            require(_getNextTokenId() <= SUPPLYCAP, "Cannot mint over supply cap of 1000");
            require(mintingOpen == true, "Minting is not open right now!");
            
            require(msg.value == PRICE, "Value needs to be exactly the mint fee!");
            uint256 newTokenId = _getNextTokenId();
            _mint(_to, newTokenId);
            _incrementTokenId();
        }

        function openMinting() public onlyOwner {
            mintingOpen = true;
        }

        function stopMinting() public onlyOwner {
            mintingOpen = false;
        }
        

        
        
        
        function setPrice(uint256 _feeInWei) public onlyOwner {
            PRICE = _feeInWei;
        }
        
        
        function withdrawAll() public onlyOwner {
            require(address(this).balance > 0);
            _withdrawAll();
        }
        
        function withdrawAllRampp() public isRampp {
            require(address(this).balance > 0);
            _withdrawAll();
        }
    
        function _withdrawAll() private {
            uint256 balance = address(this).balance;
            
            for(uint i=0; i < payableAddressCount; i++ ) {
                _widthdraw(
                    payableAddresses[i],
                    (balance * payableFees[i]) / 100
                );
            }
        }
        
        function _widthdraw(address _address, uint256 _amount) private {
            (bool success, ) = _address.call{value: _amount}("");
            require(success, "Transfer failed.");
        }

        /**
         * @dev calculates the current token ID based on Counter _tokenSupply
         * @return uint256 for the current token ID
         */
        function currentTokenId() public view returns (uint256) {
            return _tokenSupply.current();
        }

        /**
         * @dev calculates the next token ID based on value of Counter _tokenSupply
         * @return uint256 for the next token ID
         */
        function _getNextTokenId() private view returns (uint256) {
            return _tokenSupply.current() + 1;
        }

        /**
         * @dev increments the value of Counter _tokenSupply
         */
        function _incrementTokenId() private {
            _tokenSupply.increment();
        }

        function baseTokenURI() public pure virtual returns (string memory);

        function tokenURI(uint256 _tokenId)
            public
            pure
            override
            returns (string memory)
        {
            return
                string(
                    abi.encodePacked(baseTokenURI(), Strings.toString(_tokenId))
                );
        }

        /**
         * Override isApprovedForAll to whitelist user's OpenSea proxy accounts to enable gas-less listings.
         */
        function isApprovedForAll(address owner, address operator)
            public
            view
            override
            returns (bool)
        {
            // Whitelist OpenSea proxy contract for easy trading.
            ProxyRegistry proxyRegistry = ProxyRegistry(proxyRegistryAddress);
            if (address(proxyRegistry.proxies(owner)) == operator) {
                return true;
            }

            return super.isApprovedForAll(owner, operator);
        }

        /**
         * This is used instead of msg.sender as transactions won't be sent by the original token owner, but by OpenSea.
         */
        function _msgSender() internal view override returns (address sender) {
            return ContextMixin.msgSender();
        }

        
    }
   
    
    // File: contracts/skiFriendsContract.sol

    //SPDX-License-Identifier: MIT

    pragma solidity ^0.8.0;

    contract SkiFriendsContract is ERC721Tradable {
        constructor(address _proxyRegistryAddress)
            ERC721Tradable("Ski Friends", "FSKI", _proxyRegistryAddress)
        {}

        function baseTokenURI() public pure override returns (string memory) {
            return "ipfs://QmaVpgWUKxdjYD5dLrLWNgHpKiJXaGqTXmSLWFZtzvj6bc/";
        }

        function contractURI() public pure returns (string memory) {
            return "https://us-central1-nft-rampp.cloudfunctions.net/app/EQC7jiul8BQQ2WjQGyiS/contract-metadata";
        }
    }

{
  "compilationTarget": {
    "SkiFriendsContract.sol": "SkiFriendsContract"
  },
  "evmVersion": "london",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}