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// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        // Check the signature length
        if (signature.length != 65) {
            revert("ECDSA: invalid signature length");
        }

        // Divide the signature in r, s and v variables
        bytes32 r;
        bytes32 s;
        uint8 v;

        // ecrecover takes the signature parameters, and the only way to get them
        // currently is to use assembly.
        // solhint-disable-next-line no-inline-assembly
        assembly {
            r := mload(add(signature, 0x20))
            s := mload(add(signature, 0x40))
            v := byte(0, mload(add(signature, 0x60)))
        }

        return recover(hash, v, r, s);
    }

    /**
     * @dev Overload of {ECDSA-recover-bytes32-bytes-} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function recover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) internal pure returns (address) {
        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (281): 0 < s < secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        require(uint256(s) <= 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0, "ECDSA: invalid signature 's' value");
        require(v == 27 || v == 28, "ECDSA: invalid signature 'v' value");

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        require(signer != address(0), "ECDSA: invalid signature");

        return signer;
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from a `hash`. This
     * replicates the behavior of the
     * https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_sign[`eth_sign`]
     * JSON-RPC method.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {
        // 32 is the length in bytes of hash,
        // enforced by the type signature above
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <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 >=0.6.2 <0.8.0;

import "../../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 >=0.6.2 <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 >=0.6.0 <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 >=0.6.2 <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;
        // solhint-disable-next-line no-inline-assembly
        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");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private 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

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

    struct Set {
        // Storage of set values
        bytes32[] _values;

        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping (bytes32 => uint256) _indexes;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 0) { // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;

            // When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs
            // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.

            bytes32 lastvalue = set._values[lastIndex];

            // Move the last value to the index where the value to delete is
            set._values[toDeleteIndex] = lastvalue;
            // Update the index for the moved value
            set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based

            // Delete the slot where the moved value was stored
            set._values.pop();

            // Delete the index for the deleted slot
            delete set._indexes[value];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        require(set._values.length > index, "EnumerableSet: index out of bounds");
        return set._values[index];
    }

    // Bytes32Set

    struct Bytes32Set {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _add(set._inner, value);
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _remove(set._inner, value);
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
        return _contains(set._inner, value);
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(Bytes32Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
        return _at(set._inner, index);
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint160(uint256(_at(set._inner, index))));
    }


    // UintSet

    struct UintSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;

abstract contract Proxied {
    /// @notice to be used by initialisation / postUpgrade function so that only the owner can execute them
    /// It also allows these functions to be called inside a contructor when the contract
    /// is meant to be used without proxy
    modifier proxied() {
        address ownerAddress = _owner();
        // With hardhat-deploy proxies
        // the ownerAddress is zero only for the implementation contract
        // if the implementation contract want to be used as standalone
        // it simply has to execute the `proxied` function
        // This ensure the ownerAddress is never zero post deployment
        if (ownerAddress == address(0)) {
            // ensure can not be called twice when used outside of proxy : no admin
            // solhint-disable-next-line security/no-inline-assembly
            assembly {
                sstore(
                    0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103,
                    0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
                )
            }
        } else {
            require(msg.sender == ownerAddress);
        }
        _;
    }

    modifier onlyOwner() {
        require(msg.sender == _owner(), "NOT_AUTHORIZED");
        _;
    }

    function _owner() internal view returns (address ownerAddress) {
        // solhint-disable-next-line security/no-inline-assembly
        assembly {
            ownerAddress := sload(0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103)
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.7.1;

import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
// import "@openzeppelin/contracts/token/ERC721/IERC721Enumerable.sol"; // only partially implemented for efficiency and simplicity
import "@openzeppelin/contracts/introspection/IERC165.sol";
import "@openzeppelin/contracts/utils/EnumerableSet.sol";

abstract contract ERC721Base is IERC165, IERC721 {
    using Address for address;
    using EnumerableSet for EnumerableSet.UintSet;

    bytes4 internal constant ERC721_RECEIVED = 0x150b7a02;
    bytes4 internal constant ERC165ID = 0x01ffc9a7;

    uint256 internal constant OPERATOR_FLAG = (2**255);
    uint256 internal constant BURN_FLAG = (2**254);

    uint256 internal _supply;
    mapping (uint256 => uint256) internal _owners;
    mapping (address => EnumerableSet.UintSet) internal _holderTokens;
    mapping(address => mapping(address => bool)) internal _operatorsForAll;
    mapping(uint256 => address) internal _operators;


    /// @notice Approve an operator to spend tokens on the senders behalf.
    /// @param operator The address receiving the approval.
    /// @param id The id of the token.
    function approve(address operator, uint256 id) external override {
        address owner = _ownerOf(id);
        require(owner != address(0), "NONEXISTENT_TOKEN");
        require(owner == msg.sender || _operatorsForAll[owner][msg.sender], "UNAUTHORIZED_APPROVAL");
        _approveFor(owner, operator, id);
    }

    /// @notice Transfer a token between 2 addresses.
    /// @param from The sender of the token.
    /// @param to The recipient of the token.
    /// @param id The id of the token.
    function transferFrom(
        address from,
        address to,
        uint256 id
    ) external override {
        (address owner, bool operatorEnabled) = _ownerAndOperatorEnabledOf(id);
        require(owner != address(0), "NONEXISTENT_TOKEN");
        require(owner == from, "NOT_OWNER");
        require(to != address(0), "NOT_TO_ZEROADDRESS");
        if (msg.sender != from) {
            require(
                _operatorsForAll[from][msg.sender] || (operatorEnabled && _operators[id] == msg.sender),
                "UNAUTHORIZED_TRANSFER"
            );
        }
        _transferFrom(from, to, id);
    }

    /// @notice Transfer a token between 2 addresses letting the receiver know of the transfer.
    /// @param from The send of the token.
    /// @param to The recipient of the token.
    /// @param id The id of the token.
    function safeTransferFrom(
        address from,
        address to,
        uint256 id
    ) external override {
        safeTransferFrom(from, to, id, "");
    }

    /// @notice Set the approval for an operator to manage all the tokens of the sender.
    /// @param operator The address receiving the approval.
    /// @param approved The determination of the approval.
    function setApprovalForAll(address operator, bool approved) external override {
        _setApprovalForAll(msg.sender, operator, approved);
    }

    /// @notice Get the number of tokens owned by an address.
    /// @param owner The address to look for.
    /// @return balance The number of tokens owned by the address.
    function balanceOf(address owner) external view override returns (uint256 balance) {
        require(owner != address(0), "ZERO_ADDRESS_OWNER");
        balance = _holderTokens[owner].length();
    }

    /// @notice Get the owner of a token.
    /// @param id The id of the token.
    /// @return owner The address of the token owner.
    function ownerOf(uint256 id) external view override returns (address owner) {
        owner = _ownerOf(id);
        require(owner != address(0), "NONEXISTANT_TOKEN");
    }

    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256) {
        return _holderTokens[owner].at(index);
    }

    function totalSupply() external view returns (uint256) {
        return _supply;
    }

    /// @notice Get the approved operator for a specific token.
    /// @param id The id of the token.
    /// @return The address of the operator.
    function getApproved(uint256 id) external view override returns (address) {
        (address owner, bool operatorEnabled) = _ownerAndOperatorEnabledOf(id);
        require(owner != address(0), "NONEXISTENT_TOKEN");
        if (operatorEnabled) {
            return _operators[id];
        } else {
            return address(0);
        }
    }

    /// @notice Check if the sender approved the operator.
    /// @param owner The address of the owner.
    /// @param operator The address of the operator.
    /// @return isOperator The status of the approval.
    function isApprovedForAll(address owner, address operator) external view override returns (bool isOperator) {
        return _operatorsForAll[owner][operator];
    }

    /// @notice Transfer a token between 2 addresses letting the receiver knows of the transfer.
    /// @param from The sender of the token.
    /// @param to The recipient of the token.
    /// @param id The id of the token.
    /// @param data Additional data.
    function safeTransferFrom(
        address from,
        address to,
        uint256 id,
        bytes memory data
    ) public override {
        (address owner, bool operatorEnabled) = _ownerAndOperatorEnabledOf(id);
        require(owner != address(0), "NONEXISTENT_TOKEN");
        require(owner == from, "NOT_OWNER");
        require(to != address(0), "NOT_TO_ZEROADDRESS");
        if (msg.sender != from) {
            require(
                _operatorsForAll[from][msg.sender] || (operatorEnabled && _operators[id] == msg.sender),
                "UNAUTHORIZED_TRANSFER"
            );
        }
        _transferFrom(from, to, id);
        if (to.isContract()) {
            require(_checkOnERC721Received(msg.sender, from, to, id, data), "ERC721_TRANSFER_REJECTED");
        }
    }

    /// @notice Check if the contract supports an interface.
    /// 0x01ffc9a7 is ERC165.
    /// 0x80ac58cd is ERC721
    /// 0x780e9d63 is for ERC721 enumerable
    /// @param id The id of the interface.
    /// @return Whether the interface is supported.
    function supportsInterface(bytes4 id) public pure virtual override returns (bool) {
        return id == 0x01ffc9a7 || id == 0x80ac58cd || id == 0x780e9d63;
    }

    function _transferFrom(
        address from,
        address to,
        uint256 id
    ) internal {
        _holderTokens[from].remove(id);
        _holderTokens[to].add(id);
        _owners[id] = uint256(to);
        emit Transfer(from, to, id);
    }

    /// @dev See approve.
    function _approveFor(
        address owner,
        address operator,
        uint256 id
    ) internal {
        if (operator == address(0)) {
            _owners[id] =  uint256(owner);
        } else {
            _owners[id] = OPERATOR_FLAG | uint256(owner);
            _operators[id] = operator;
        }
        emit Approval(owner, operator, id);
    }

    /// @dev See setApprovalForAll.
    function _setApprovalForAll(
        address sender,
        address operator,
        bool approved
    ) internal {
        _operatorsForAll[sender][operator] = approved;

        emit ApprovalForAll(sender, operator, approved);
    }

    /// @dev Check if receiving contract accepts erc721 transfers.
    /// @param operator The address of the operator.
    /// @param from The from address, may be different from msg.sender.
    /// @param to The adddress we want to transfer to.
    /// @param id The id of the token we would like to transfer.
    /// @param data Any additional data to send with the transfer.
    /// @return Whether the expected value of 0x150b7a02 is returned.
    function _checkOnERC721Received(
        address operator,
        address from,
        address to,
        uint256 id,
        bytes memory data
    ) internal returns (bool) {
        bytes4 retval = IERC721Receiver(to).onERC721Received(operator, from, id, data);
        return (retval == ERC721_RECEIVED);
    }

    /// @dev See ownerOf
    function _ownerOf(uint256 id) internal view returns (address owner) {
        owner = address(_owners[id]);
        require(owner != address(0), "NOT_EXIST");
    }

    /// @dev Get the owner and operatorEnabled status of a token.
    /// @param id The token to query.
    /// @return owner The owner of the token.
    /// @return operatorEnabled Whether or not operators are enabled for this token.
    function _ownerAndOperatorEnabledOf(uint256 id) internal view returns (address owner, bool operatorEnabled) {
        uint256 data = _owners[id];
        owner = address(data);
        operatorEnabled = (data & OPERATOR_FLAG) == OPERATOR_FLAG;
    }

    function _mint(uint256 id, address to) internal {
        require(to != address(0), "NOT_TO_ZEROADDRESS");
        uint256 data = _owners[id];
        require(data == 0, "ALREADY_MINTED");
        _holderTokens[to].add(id);
        _owners[id] = uint256(to);
        _supply ++;
        emit Transfer(address(0), to, id);
    }

    function _burn(uint256 id) internal {
        uint256 data = _owners[id];
        require(data != 0, "NOT_EXIST");
        require(data & BURN_FLAG == 0, "ALREADY_BURNT");
        address owner = address(data);
        require(msg.sender == owner, "NOT_OWNER");
        _holderTokens[owner].remove(id);
        _owners[id] = BURN_FLAG;
        _supply --;
        emit Transfer(msg.sender, address(0), id);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.7.1;
pragma experimental ABIEncoderV2;

// solhint-disable quotes

import "./ERC721Base.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721Metadata.sol";
import "@openzeppelin/contracts/cryptography/ECDSA.sol";
import "hardhat-deploy/solc_0.7/proxy/Proxied.sol";

contract MandalaToken is ERC721Base, IERC721Metadata, Proxied {
    using EnumerableSet for EnumerableSet.UintSet;
    using ECDSA for bytes32;


    // solhint-disable-next-line quotes
    bytes internal constant TEMPLATE = 'data:text/plain,{"name":"Mandala 0x0000000000000000000000000000000000000000","description":"A Unique Mandala","image":"data:image/svg+xml,<svg xmlns=\'http://www.w3.org/2000/svg\' shape-rendering=\'crispEdges\' width=\'512\' height=\'512\'><g transform=\'scale(64)\'><image width=\'8\' height=\'8\' style=\'image-rendering: pixelated;\' href=\'data:image/gif;base64,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\'/></g></svg>"}';
    uint256 internal constant IMAGE_DATA_POS = 521;
    uint256 internal constant ADDRESS_NAME_POS = 74;

    uint256 internal constant WIDTH = 19;
    uint256 internal constant HEIGHT = 19;
    uint256 internal constant ROW_PER_BLOCK = 4;
    bytes32 constant internal xs = 0x8934893467893456789456789567896789789899000000000000000000000000;
    bytes32 constant internal ys = 0x0011112222223333333444444555556666777889000000000000000000000000;

    event Minted(uint256 indexed id, uint256 indexed pricePaid);
    event Burned(uint256 indexed id, uint256 indexed priceReceived);
    event CreatorshipTransferred(address indexed previousCreator, address indexed newCreator);

    uint256 public immutable linearCoefficient;
    uint256 public immutable initialPrice;
    uint256 public immutable creatorCutPer10000th;
    address payable public creator;

    constructor(address payable _creator, uint256 _initialPrice, uint256 _creatorCutPer10000th, uint256 _linearCoefficient) {
        require(_creatorCutPer10000th < 2000, "CREATOR_CUT_ROO_HIGHT");
        initialPrice = _initialPrice;
        creatorCutPer10000th = _creatorCutPer10000th;
        linearCoefficient = _linearCoefficient;
        postUpgrade(_creator, _initialPrice, _creatorCutPer10000th, _linearCoefficient);
    }

    // solhint-disable-next-line no-unused-vars
    function postUpgrade(address payable _creator, uint256 _initialPrice, uint256 _creatorCutPer10000th, uint256 _linearCoefficient) public proxied {
        // immutables are set in the constructor:
        // initialPrice = _initialPrice;
        // creatorCutPer10000th = _creatorCutPer10000th;
        // linearCoefficient = _linearCoefficient;
        creator = _creator;
        emit CreatorshipTransferred(address(0), creator);
    }


    function transferCreatorship(address payable newCreatorAddress) external {
        address oldCreator = creator;
        require(oldCreator == msg.sender, "NOT_AUTHORIZED");
        creator = newCreatorAddress;
        emit CreatorshipTransferred(oldCreator, newCreatorAddress);
    }

    /// @notice A descriptive name for a collection of NFTs in this contract
    function name() external pure override returns (string memory) {
        return "Mandala Tokens";
    }

    /// @notice An abbreviated name for NFTs in this contract
    function symbol() external pure override returns (string memory) {
        return "MANDALA";
    }

    function tokenURI(uint256 id) public view virtual override returns (string memory) {
        address owner = _ownerOf(id);
        require(owner != address(0), "NOT_EXISTS");
        return _tokenURI(id);
    }

    /// @notice Check if the contract supports an interface.
    /// 0x01ffc9a7 is ERC165.
    /// 0x80ac58cd is ERC721
    /// 0x5b5e139f is for ERC721 metadata
    /// 0x780e9d63 is for ERC721 enumerable
    /// @param id The id of the interface.
    /// @return Whether the interface is supported.
    function supportsInterface(bytes4 id) public pure virtual override(ERC721Base, IERC165) returns (bool) {
        return ERC721Base.supportsInterface(id) || id == 0x5b5e139f;
    }

    struct TokenData {
        uint256 id;
        string tokenURI;
    }

    function getTokenDataOfOwner(
        address owner,
        uint256 start,
        uint256 num
    ) external view returns (TokenData[] memory tokens) {
        EnumerableSet.UintSet storage allTokens = _holderTokens[owner];
        uint256 balance = allTokens.length();
        require(balance >= start + num, "TOO_MANY_TOKEN_REQUESTED");
        tokens = new TokenData[](num);
        uint256 i = 0;
        while (i < num) {
            uint256 id = allTokens.at(start + i);
            tokens[i] = TokenData(id, _tokenURI(id));
            i++;
        }
    }

    function mint(address to, bytes memory signature) external payable returns (uint256) {
        uint256 mintPrice = _curve(_supply);
        require(msg.value >= mintPrice, "NOT_ENOUGH_ETH");


        // -------------------------- MINTING ---------------------------------------------------------
        bytes32 hashedData = keccak256(abi.encodePacked("Mandala", to));
        address signer = hashedData.toEthSignedMessageHash().recover(signature);
        _mint(uint256(signer), to);
        // -------------------------- MINTING ---------------------------------------------------------

        uint256 forCreator = mintPrice - _forReserve(mintPrice);

        // responsibility of the creator to ensure it can receive the fund
        bool success = true;
        if (forCreator > 0) {
            // solhint-disable-next-line check-send-result
            success = creator.send(forCreator);
        }

        if(!success || msg.value > mintPrice) {
            msg.sender.transfer(msg.value - mintPrice + (!success ? forCreator : 0));
        }

        emit Minted(uint256(signer), mintPrice);
        return uint256(signer);
    }


    function burn(uint256 id) external {
        uint256 burnPrice = _forReserve(_curve(_supply - 1));

        _burn(id);

        msg.sender.transfer(burnPrice);
        emit Burned(id, burnPrice);
    }

    function currentPrice() external view returns (uint256) {
        return _curve(_supply);
    }

    function _curve(uint256 supply) internal view returns (uint256) {
        return initialPrice + supply * linearCoefficient;
    }

    function _forReserve(uint256 mintPrice) internal view returns (uint256) {
        return mintPrice * (10000-creatorCutPer10000th) / 10000;
    }


    // solhint-disable-next-line code-complexity
    function _tokenURI(uint256 id) internal pure returns (string memory) {
        bytes memory metadata = TEMPLATE;
        writeUintAsHex(metadata, ADDRESS_NAME_POS, id);

        for (uint256 i = 0; i < 40; i++) {
            uint8 value = uint8((id >> (40-(i+1))*4) % 16);
            if (value == 0) {
                value = 16; // use black as oposed to transparent
            }
            uint256 x = extract(xs, i);
            uint256 y = extract(ys, i);
            setCharacter(metadata, IMAGE_DATA_POS, y*WIDTH + x + (y /ROW_PER_BLOCK) * 2 + 1, value);

            if (x != y) {
                setCharacter(metadata, IMAGE_DATA_POS, x*WIDTH + y + (x /ROW_PER_BLOCK) * 2 + 1, value);
                if (y != HEIGHT / 2) {
                    setCharacter(metadata, IMAGE_DATA_POS, x*WIDTH + (WIDTH -y -1) + (x /ROW_PER_BLOCK) * 2 + 1, value); // x mirror
                }

                if (x != WIDTH / 2) {
                    setCharacter(metadata, IMAGE_DATA_POS, (HEIGHT-x-1)*WIDTH + y + ((HEIGHT-x-1) /ROW_PER_BLOCK) * 2 + 1, value); // y mirror
                }

                if (x != WIDTH / 2 && y != HEIGHT / 2) {
                    setCharacter(metadata, IMAGE_DATA_POS, (HEIGHT-x-1)*WIDTH + (WIDTH-y-1) + ((HEIGHT-x-1) /ROW_PER_BLOCK) * 2 + 1, value); // x,y mirror
                }
            }

            if (x != WIDTH / 2) {
                setCharacter(metadata, IMAGE_DATA_POS, y*WIDTH + (WIDTH -x -1) + (y /ROW_PER_BLOCK) * 2 + 1, value); // x mirror
            }
            if (y != HEIGHT / 2) {
                setCharacter(metadata, IMAGE_DATA_POS, (HEIGHT-y-1)*WIDTH + x + ((HEIGHT-y-1) /ROW_PER_BLOCK) * 2 + 1, value); // y mirror
            }

            if (x != WIDTH / 2 && y != HEIGHT / 2) {
                setCharacter(metadata, IMAGE_DATA_POS, (HEIGHT-y-1)*WIDTH + (WIDTH-x-1) + ((HEIGHT-y-1) /ROW_PER_BLOCK) * 2 + 1, value); // x,y mirror
            }
        }
        return string(metadata);
    }


    function setCharacter(bytes memory metadata, uint256 base, uint256 pos, uint8 value) internal pure {
        uint256 base64Slot = base + (pos * 8) / 6;
        uint8 bit = uint8((pos * 8) % 6);
        uint8 existingValue = base64ToUint8(metadata[base64Slot]);
        if (bit == 0) {
            metadata[base64Slot] = uint8ToBase64(value >> 2);
            uint8 extraValue = base64ToUint8(metadata[base64Slot + 1]);
            metadata[base64Slot + 1] = uint8ToBase64(((value % 4) << 4) | (0x0F & extraValue));
        } else if (bit == 2) {
            metadata[base64Slot] = uint8ToBase64((value >> 4) | (0x30 & existingValue));
            uint8 extraValue = base64ToUint8(metadata[base64Slot + 1]);
            metadata[base64Slot + 1] = uint8ToBase64(((value % 16) << 2) | (0x03 & extraValue));
        } else { // bit == 4)
            // metadata[base64Slot] = uint8ToBase64((value >> 6) | (0x3C & existingValue)); // skip as value are never as big
            metadata[base64Slot + 1] = uint8ToBase64(value % 64);
        }
    }

    function extract(bytes32 arr, uint256 i) internal pure returns (uint256) {
        return (uint256(arr) >> (256 - (i+1) * 4)) % 16;
    }

    bytes32 constant internal base64Alphabet_1 = 0x4142434445464748494A4B4C4D4E4F505152535455565758595A616263646566;
    bytes32 constant internal base64Alphabet_2 = 0x6768696A6B6C6D6E6F707172737475767778797A303132333435363738392B2F;

    function base64ToUint8(bytes1 s) internal pure returns (uint8 v) {
        if (uint8(s) == 0x2B) {
            return 62;
        }
        if (uint8(s) == 0x2F) {
            return 63;
        }
        if (uint8(s) >= 0x30 && uint8(s) <= 0x39) {
            return uint8(s) - 0x30 + 52;
        }
        if (uint8(s) >= 0x41 && uint8(s) <= 0x5A) {
            return uint8(s) - 0x41;
        }
        if (uint8(s) >= 0x5A && uint8(s) <= 0x7A) {
            return uint8(s) - 0x5A + 26;
        }
        return 0;
    }

    function uint8ToBase64(uint24 v) internal pure returns (bytes1 s) {
        if (v >= 32) {
            return base64Alphabet_2[v - 32];
        }
        return base64Alphabet_1[v];
    }

    bytes constant internal hexAlphabet = "0123456789abcdef";

    function writeUintAsHex(bytes memory data, uint256 endPos, uint256 num) internal pure {
        while (num != 0) {
            data[endPos--] = bytes1(hexAlphabet[num % 16]);
            num /= 16;
        }
    }

}

{
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 2000
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  }
}

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0000000000000000000000008350c9989ef11325b36ce6f7549004d418dbcee700000000000000000000000000000000000000000000000000038d7ea4c6800000000000000000000000000000000000000000000000000000000000000001f40000000000000000000000000000000000000000000000000001c6bf52634000

-----Decoded View---------------
Arg [0] : _creator (address): 0x8350C9989EF11325b36Ce6f7549004D418dbcEE7
Arg [1] : _initialPrice (uint256): 1000000000000000
Arg [2] : _creatorCutPer10000th (uint256): 500
Arg [3] : _linearCoefficient (uint256): 500000000000000

-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 0000000000000000000000008350c9989ef11325b36ce6f7549004d418dbcee7
Arg [1] : 00000000000000000000000000000000000000000000000000038d7ea4c68000
Arg [2] : 00000000000000000000000000000000000000000000000000000000000001f4
Arg [3] : 0000000000000000000000000000000000000000000000000001c6bf52634000