Token Mean Finance - DCA Position

 

Overview [ERC-721]

Max Total Supply:
20,578 MF-DCA-P

Holders:
13,248
Contract:
0x20bdae1413659f47416f769a4b27044946bc99230x20bdAE1413659f47416f769a4B27044946bc9923

Social Profiles:
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Balance
1 MF-DCA-P
0xa0a0e4c41eac834d12f83120e298cd24fd6de1aa
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Contract Source Code Verified (Exact Match)

Contract Name:
DCAPermissionsManager

Compiler Version
v0.8.16+commit.07a7930e

Optimization Enabled:
Yes with 9999 runs

Other Settings:
default evmVersion
File 1 of 20 : DCAPermissionsManager.sol
// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.8.7 <0.9.0;

import '@openzeppelin/contracts/token/ERC721/ERC721.sol';
import '@openzeppelin/contracts/utils/cryptography/draft-EIP712.sol';
import '../interfaces/IDCAHub.sol';
import '../interfaces/IDCAPermissionManager.sol';
import '../libraries/PermissionMath.sol';
import '../utils/Governable.sol';

// Note: ideally, this would be part of the DCAHub. However, since we've reached the max bytecode size, we needed to make it its own contract
contract DCAPermissionsManager is ERC721, EIP712, Governable, IDCAPermissionManager {
  struct TokenPermission {
    // The actual permissions
    uint8 permissions;
    // The block number when it was last updated
    uint248 lastUpdated;
  }

  using PermissionMath for Permission[];
  using PermissionMath for uint8;

  /// @inheritdoc IDCAPermissionManager
  bytes32 public constant PERMIT_TYPEHASH = keccak256('Permit(address spender,uint256 tokenId,uint256 nonce,uint256 deadline)');
  /// @inheritdoc IDCAPermissionManager
  bytes32 public constant PERMISSION_PERMIT_TYPEHASH =
    keccak256(
      'PermissionPermit(PermissionSet[] permissions,uint256 tokenId,uint256 nonce,uint256 deadline)PermissionSet(address operator,uint8[] permissions)'
    );
  /// @inheritdoc IDCAPermissionManager
  bytes32 public constant MULTI_PERMISSION_PERMIT_TYPEHASH =
    keccak256(
      'MultiPermissionPermit(PositionPermissions[] positions,uint256 nonce,uint256 deadline)PermissionSet(address operator,uint8[] permissions)PositionPermissions(uint256 tokenId,PermissionSet[] permissionSets)'
    );
  /// @inheritdoc IDCAPermissionManager
  bytes32 public constant PERMISSION_SET_TYPEHASH = keccak256('PermissionSet(address operator,uint8[] permissions)');
  /// @inheritdoc IDCAPermissionManager
  bytes32 public constant POSITION_PERMISSIONS_TYPEHASH =
    keccak256('PositionPermissions(uint256 tokenId,PermissionSet[] permissionSets)PermissionSet(address operator,uint8[] permissions)');
  /// @inheritdoc IDCAPermissionManager
  IDCAHubPositionDescriptor public nftDescriptor;
  /// @inheritdoc IDCAPermissionManager
  address public hub;
  /// @inheritdoc IDCAPermissionManager
  mapping(address => uint256) public nonces;
  mapping(uint256 => uint256) public lastOwnershipChange;
  mapping(uint256 => mapping(address => TokenPermission)) public tokenPermissions;
  uint256 internal _burnCounter;

  constructor(address _governor, IDCAHubPositionDescriptor _descriptor)
    ERC721('Mean Finance - DCA Position', 'MF-DCA-P')
    EIP712('Mean Finance - DCA Position', '2')
    Governable(_governor)
  {
    if (address(_descriptor) == address(0)) revert ZeroAddress();
    nftDescriptor = _descriptor;
  }

  /// @inheritdoc IDCAPermissionManager
  function setHub(address _hub) external {
    if (_hub == address(0)) revert ZeroAddress();
    if (hub != address(0)) revert HubAlreadySet();
    hub = _hub;
  }

  /// @inheritdoc IDCAPermissionManager
  function mint(
    uint256 _id,
    address _owner,
    PermissionSet[] calldata _permissions
  ) external {
    if (msg.sender != hub) revert OnlyHubCanExecute();
    _mint(_owner, _id);
    _setPermissions(_id, _permissions);
  }

  /// @inheritdoc IDCAPermissionManager
  function hasPermission(
    uint256 _id,
    address _address,
    Permission _permission
  ) external view returns (bool) {
    if (ownerOf(_id) == _address) {
      return true;
    }
    TokenPermission memory _tokenPermission = tokenPermissions[_id][_address];
    // If there was an ownership change after the permission was last updated, then the address doesn't have the permission
    return _tokenPermission.permissions.hasPermission(_permission) && lastOwnershipChange[_id] < _tokenPermission.lastUpdated;
  }

  /// @inheritdoc IDCAPermissionManager
  function hasPermissions(
    uint256 _id,
    address _address,
    Permission[] calldata _permissions
  ) external view returns (bool[] memory _hasPermissions) {
    _hasPermissions = new bool[](_permissions.length);
    if (ownerOf(_id) == _address) {
      // If the address is the owner, then they have all permissions
      for (uint256 i = 0; i < _permissions.length; i++) {
        _hasPermissions[i] = true;
      }
    } else {
      // If it's not the owner, then check one by one
      TokenPermission memory _tokenPermission = tokenPermissions[_id][_address];
      if (lastOwnershipChange[_id] < _tokenPermission.lastUpdated) {
        for (uint256 i = 0; i < _permissions.length; i++) {
          if (_tokenPermission.permissions.hasPermission(_permissions[i])) {
            _hasPermissions[i] = true;
          }
        }
      }
    }
  }

  /// @inheritdoc IDCAPermissionManager
  function burn(uint256 _id) external {
    if (msg.sender != hub) revert OnlyHubCanExecute();
    _burn(_id);
    ++_burnCounter;
  }

  /// @inheritdoc IDCAPermissionManager
  function modify(uint256 _id, PermissionSet[] calldata _permissions) public virtual {
    if (msg.sender != ownerOf(_id)) revert NotOwner();
    _modify(_id, _permissions);
  }

  /// @inheritdoc IDCAPermissionManager
  function modifyMany(PositionPermissions[] calldata _permissions) external {
    for (uint256 i = 0; i < _permissions.length; ) {
      modify(_permissions[i].tokenId, _permissions[i].permissionSets);
      unchecked {
        i++;
      }
    }
  }

  /// @inheritdoc IDCAPermissionManager
  // solhint-disable-next-line func-name-mixedcase
  function DOMAIN_SEPARATOR() external view returns (bytes32) {
    return _domainSeparatorV4();
  }

  /// @inheritdoc IERC721BasicEnumerable
  function totalSupply() external view returns (uint256) {
    return IDCAHubPositionHandler(hub).totalCreatedPositions() - _burnCounter;
  }

  /// @inheritdoc IDCAPermissionManager
  function permit(
    address _spender,
    uint256 _tokenId,
    uint256 _deadline,
    uint8 _v,
    bytes32 _r,
    bytes32 _s
  ) external {
    if (block.timestamp > _deadline) revert ExpiredDeadline();

    address _owner = ownerOf(_tokenId);
    bytes32 _structHash = keccak256(abi.encode(PERMIT_TYPEHASH, _spender, _tokenId, nonces[_owner]++, _deadline));
    bytes32 _hash = _hashTypedDataV4(_structHash);

    address _signer = ECDSA.recover(_hash, _v, _r, _s);
    if (_signer != _owner) revert InvalidSignature();

    _approve(_spender, _tokenId);
  }

  /// @inheritdoc IDCAPermissionManager
  function permissionPermit(
    PermissionSet[] calldata _permissions,
    uint256 _tokenId,
    uint256 _deadline,
    uint8 _v,
    bytes32 _r,
    bytes32 _s
  ) external {
    if (block.timestamp > _deadline) revert ExpiredDeadline();

    address _owner = ownerOf(_tokenId);
    bytes32 _structHash = keccak256(
      abi.encode(PERMISSION_PERMIT_TYPEHASH, keccak256(_encode(_permissions)), _tokenId, nonces[_owner]++, _deadline)
    );
    bytes32 _hash = _hashTypedDataV4(_structHash);

    address _signer = ECDSA.recover(_hash, _v, _r, _s);
    if (_signer != _owner) revert InvalidSignature();

    _modify(_tokenId, _permissions);
  }

  /// @inheritdoc IDCAPermissionManager
  function multiPermissionPermit(
    PositionPermissions[] calldata _permissions,
    uint256 _deadline,
    uint8 _v,
    bytes32 _r,
    bytes32 _s
  ) external {
    if (block.timestamp > _deadline) revert ExpiredDeadline();

    address _owner = ownerOf(_permissions[0].tokenId);
    bytes32 _structHash = keccak256(abi.encode(MULTI_PERMISSION_PERMIT_TYPEHASH, keccak256(_encode(_permissions)), nonces[_owner]++, _deadline));
    bytes32 _hash = _hashTypedDataV4(_structHash);

    address _signer = ECDSA.recover(_hash, _v, _r, _s);
    if (_signer != _owner) revert InvalidSignature();

    for (uint256 i = 0; i < _permissions.length; ) {
      uint256 _tokenId = _permissions[i].tokenId;
      if (i > 0) {
        address _positionOwner = ownerOf(_tokenId);
        if (_signer != _positionOwner) revert NotOwner();
      }
      _modify(_tokenId, _permissions[i].permissionSets);
      unchecked {
        i++;
      }
    }
  }

  /// @inheritdoc IDCAPermissionManager
  function setNFTDescriptor(IDCAHubPositionDescriptor _descriptor) external onlyGovernor {
    if (address(_descriptor) == address(0)) revert ZeroAddress();
    nftDescriptor = _descriptor;
    emit NFTDescriptorSet(_descriptor);
  }

  /// @inheritdoc ERC721
  function tokenURI(uint256 _tokenId) public view override returns (string memory) {
    return nftDescriptor.tokenURI(hub, _tokenId);
  }

  function _encode(PositionPermissions[] calldata _permissions) internal pure returns (bytes memory _result) {
    for (uint256 i = 0; i < _permissions.length; ) {
      _result = bytes.concat(_result, keccak256(_encode(_permissions[i])));
      unchecked {
        i++;
      }
    }
  }

  function _encode(PositionPermissions calldata _permission) internal pure returns (bytes memory _result) {
    _result = abi.encode(POSITION_PERMISSIONS_TYPEHASH, _permission.tokenId, keccak256(_encode(_permission.permissionSets)));
  }

  function _encode(PermissionSet[] calldata _permissions) internal pure returns (bytes memory _result) {
    for (uint256 i = 0; i < _permissions.length; ) {
      _result = bytes.concat(_result, keccak256(_encode(_permissions[i])));
      unchecked {
        i++;
      }
    }
  }

  function _encode(PermissionSet calldata _permission) internal pure returns (bytes memory _result) {
    _result = abi.encode(PERMISSION_SET_TYPEHASH, _permission.operator, keccak256(_encode(_permission.permissions)));
  }

  function _encode(Permission[] calldata _permissions) internal pure returns (bytes memory _result) {
    _result = new bytes(_permissions.length * 32);
    for (uint256 i = 0; i < _permissions.length; ) {
      _result[(i + 1) * 32 - 1] = bytes1(uint8(_permissions[i]));
      unchecked {
        i++;
      }
    }
  }

  function _modify(uint256 _id, PermissionSet[] calldata _permissions) internal {
    _setPermissions(_id, _permissions);
    emit Modified(_id, _permissions);
  }

  function _setPermissions(uint256 _id, PermissionSet[] calldata _permissions) internal {
    uint248 _blockNumber = uint248(_getBlockNumber());
    for (uint256 i = 0; i < _permissions.length; ) {
      PermissionSet memory _permissionSet = _permissions[i];
      if (_permissionSet.permissions.length == 0) {
        delete tokenPermissions[_id][_permissionSet.operator];
      } else {
        tokenPermissions[_id][_permissionSet.operator] = TokenPermission({
          permissions: _permissionSet.permissions.toUInt8(),
          lastUpdated: _blockNumber
        });
      }
      unchecked {
        i++;
      }
    }
  }

  function _beforeTokenTransfer(
    address _from,
    address _to,
    uint256 _id
  ) internal override {
    if (_to == address(0)) {
      // When token is being burned, we can delete this entry on the mapping
      delete lastOwnershipChange[_id];
    } else if (_from != address(0)) {
      // If the token is being minted, then no need to write this
      lastOwnershipChange[_id] = _getBlockNumber();
    }
  }

  // Note: virtual so that it can be overriden in tests
  function _getBlockNumber() internal view virtual returns (uint256) {
    return block.number;
  }
}

File 2 of 20 : ERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC721/ERC721.sol)

pragma solidity ^0.8.0;

import "./IERC721.sol";
import "./IERC721Receiver.sol";
import "./extensions/IERC721Metadata.sol";
import "../../utils/Address.sol";
import "../../utils/Context.sol";
import "../../utils/Strings.sol";
import "../../utils/introspection/ERC165.sol";

/**
 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
 * the Metadata extension, but not including the Enumerable extension, which is available separately as
 * {ERC721Enumerable}.
 */
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
    using Address for address;
    using Strings for uint256;

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

    // Mapping from token ID to owner address
    mapping(uint256 => address) private _owners;

    // Mapping owner address to token count
    mapping(address => uint256) private _balances;

    // Mapping from token ID to approved address
    mapping(uint256 => address) private _tokenApprovals;

    // Mapping from owner to operator approvals
    mapping(address => mapping(address => bool)) private _operatorApprovals;

    /**
     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return
            interfaceId == type(IERC721).interfaceId ||
            interfaceId == type(IERC721Metadata).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), "ERC721: address zero is not a valid owner");
        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: invalid token ID");
        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) {
        _requireMinted(tokenId);

        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 overridden 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 token owner nor approved for all"
        );

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        _requireMinted(tokenId);

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        _setApprovalForAll(_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: caller is not token 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: caller is not token 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) {
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || isApprovedForAll(owner, spender) || getApproved(tokenId) == 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);

        _afterTokenTransfer(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);

        _afterTokenTransfer(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 from incorrect owner");
        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);

        _afterTokenTransfer(from, to, tokenId);
    }

    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits an {Approval} event.
     */
    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
    }

    /**
     * @dev Approve `operator` to operate on all of `owner` tokens
     *
     * Emits an {ApprovalForAll} event.
     */
    function _setApprovalForAll(
        address owner,
        address operator,
        bool approved
    ) internal virtual {
        require(owner != operator, "ERC721: approve to caller");
        _operatorApprovals[owner][operator] = approved;
        emit ApprovalForAll(owner, operator, approved);
    }

    /**
     * @dev Reverts if the `tokenId` has not been minted yet.
     */
    function _requireMinted(uint256 tokenId) internal view virtual {
        require(_exists(tokenId), "ERC721: invalid token ID");
    }

    /**
     * @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 {
                    /// @solidity memory-safe-assembly
                    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 {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {}
}

File 3 of 20 : draft-EIP712.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/cryptography/draft-EIP712.sol)

pragma solidity ^0.8.0;

import "./ECDSA.sol";

/**
 * @dev https://eips.ethereum.org/EIPS/eip-712[EIP 712] is a standard for hashing and signing of typed structured data.
 *
 * The encoding specified in the EIP is very generic, and such a generic implementation in Solidity is not feasible,
 * thus this contract does not implement the encoding itself. Protocols need to implement the type-specific encoding
 * they need in their contracts using a combination of `abi.encode` and `keccak256`.
 *
 * This contract implements the EIP 712 domain separator ({_domainSeparatorV4}) that is used as part of the encoding
 * scheme, and the final step of the encoding to obtain the message digest that is then signed via ECDSA
 * ({_hashTypedDataV4}).
 *
 * The implementation of the domain separator was designed to be as efficient as possible while still properly updating
 * the chain id to protect against replay attacks on an eventual fork of the chain.
 *
 * NOTE: This contract implements the version of the encoding known as "v4", as implemented by the JSON RPC method
 * https://docs.metamask.io/guide/signing-data.html[`eth_signTypedDataV4` in MetaMask].
 *
 * _Available since v3.4._
 */
abstract contract EIP712 {
    /* solhint-disable var-name-mixedcase */
    // Cache the domain separator as an immutable value, but also store the chain id that it corresponds to, in order to
    // invalidate the cached domain separator if the chain id changes.
    bytes32 private immutable _CACHED_DOMAIN_SEPARATOR;
    uint256 private immutable _CACHED_CHAIN_ID;
    address private immutable _CACHED_THIS;

    bytes32 private immutable _HASHED_NAME;
    bytes32 private immutable _HASHED_VERSION;
    bytes32 private immutable _TYPE_HASH;

    /* solhint-enable var-name-mixedcase */

    /**
     * @dev Initializes the domain separator and parameter caches.
     *
     * The meaning of `name` and `version` is specified in
     * https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP 712]:
     *
     * - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol.
     * - `version`: the current major version of the signing domain.
     *
     * NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart
     * contract upgrade].
     */
    constructor(string memory name, string memory version) {
        bytes32 hashedName = keccak256(bytes(name));
        bytes32 hashedVersion = keccak256(bytes(version));
        bytes32 typeHash = keccak256(
            "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"
        );
        _HASHED_NAME = hashedName;
        _HASHED_VERSION = hashedVersion;
        _CACHED_CHAIN_ID = block.chainid;
        _CACHED_DOMAIN_SEPARATOR = _buildDomainSeparator(typeHash, hashedName, hashedVersion);
        _CACHED_THIS = address(this);
        _TYPE_HASH = typeHash;
    }

    /**
     * @dev Returns the domain separator for the current chain.
     */
    function _domainSeparatorV4() internal view returns (bytes32) {
        if (address(this) == _CACHED_THIS && block.chainid == _CACHED_CHAIN_ID) {
            return _CACHED_DOMAIN_SEPARATOR;
        } else {
            return _buildDomainSeparator(_TYPE_HASH, _HASHED_NAME, _HASHED_VERSION);
        }
    }

    function _buildDomainSeparator(
        bytes32 typeHash,
        bytes32 nameHash,
        bytes32 versionHash
    ) private view returns (bytes32) {
        return keccak256(abi.encode(typeHash, nameHash, versionHash, block.chainid, address(this)));
    }

    /**
     * @dev Given an already https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct[hashed struct], this
     * function returns the hash of the fully encoded EIP712 message for this domain.
     *
     * This hash can be used together with {ECDSA-recover} to obtain the signer of a message. For example:
     *
     * ```solidity
     * bytes32 digest = _hashTypedDataV4(keccak256(abi.encode(
     *     keccak256("Mail(address to,string contents)"),
     *     mailTo,
     *     keccak256(bytes(mailContents))
     * )));
     * address signer = ECDSA.recover(digest, signature);
     * ```
     */
    function _hashTypedDataV4(bytes32 structHash) internal view virtual returns (bytes32) {
        return ECDSA.toTypedDataHash(_domainSeparatorV4(), structHash);
    }
}

File 4 of 20 : IDCAHub.sol
// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.8.7 <0.9.0;

import '@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol';
import '@mean-finance/oracles/solidity/interfaces/ITokenPriceOracle.sol';
import './IDCAPermissionManager.sol';

/**
 * @title The interface for all state related queries
 * @notice These methods allow users to read the hubs's current values
 */
interface IDCAHubParameters {
  /**
   * @notice Returns how much will the amount to swap differ from the previous swap. f.e. if the returned value is -100, then the amount to swap will be 100 less than the swap just before it
   * @dev `tokenA` must be smaller than `tokenB` (tokenA < tokenB)
   * @param tokenA One of the pair's token
   * @param tokenB The other of the pair's token
   * @param swapIntervalMask The byte representation of the swap interval to check
   * @param swapNumber The swap number to check
   * @return swapDeltaAToB How much less of token A will the following swap require
   * @return swapDeltaBToA How much less of token B will the following swap require
   */
  function swapAmountDelta(
    address tokenA,
    address tokenB,
    bytes1 swapIntervalMask,
    uint32 swapNumber
  ) external view returns (uint128 swapDeltaAToB, uint128 swapDeltaBToA);

  /**
   * @notice Returns the sum of the ratios reported in all swaps executed until the given swap number
   * @dev `tokenA` must be smaller than `tokenB` (tokenA < tokenB)
   * @param tokenA One of the pair's token
   * @param tokenB The other of the pair's token
   * @param swapIntervalMask The byte representation of the swap interval to check
   * @param swapNumber The swap number to check
   * @return accumRatioAToB The sum of all ratios from A to B
   * @return accumRatioBToA The sum of all ratios from B to A
   */
  function accumRatio(
    address tokenA,
    address tokenB,
    bytes1 swapIntervalMask,
    uint32 swapNumber
  ) external view returns (uint256 accumRatioAToB, uint256 accumRatioBToA);

  /**
   * @notice Returns swapping information about a specific pair
   * @dev `tokenA` must be smaller than `tokenB` (tokenA < tokenB)
   * @param tokenA One of the pair's token
   * @param tokenB The other of the pair's token
   * @param swapIntervalMask The byte representation of the swap interval to check
   * @return performedSwaps How many swaps have been executed
   * @return nextAmountToSwapAToB How much of token A will be swapped on the next swap
   * @return lastSwappedAt Timestamp of the last swap
   * @return nextAmountToSwapBToA How much of token B will be swapped on the next swap
   */
  function swapData(
    address tokenA,
    address tokenB,
    bytes1 swapIntervalMask
  )
    external
    view
    returns (
      uint32 performedSwaps,
      uint224 nextAmountToSwapAToB,
      uint32 lastSwappedAt,
      uint224 nextAmountToSwapBToA
    );

  /**
   * @notice Returns the byte representation of the set of actice swap intervals for the given pair
   * @dev `tokenA` must be smaller than `tokenB` (tokenA < tokenB)
   * @param tokenA The smaller of the pair's token
   * @param tokenB The other of the pair's token
   * @return The byte representation of the set of actice swap intervals
   */
  function activeSwapIntervals(address tokenA, address tokenB) external view returns (bytes1);

  /**
   * @notice Returns how much of the hub's token balance belongs to the platform
   * @param token The token to check
   * @return The amount that belongs to the platform
   */
  function platformBalance(address token) external view returns (uint256);
}

/**
 * @title The interface for all position related matters
 * @notice These methods allow users to create, modify and terminate their positions
 */
interface IDCAHubPositionHandler {
  /// @notice The position of a certain user
  struct UserPosition {
    // The token that the user deposited and will be swapped in exchange for "to"
    IERC20Metadata from;
    // The token that the user will get in exchange for their "from" tokens in each swap
    IERC20Metadata to;
    // How frequently the position's swaps should be executed
    uint32 swapInterval;
    // How many swaps were executed since deposit, last modification, or last withdraw
    uint32 swapsExecuted;
    // How many "to" tokens can currently be withdrawn
    uint256 swapped;
    // How many swaps left the position has to execute
    uint32 swapsLeft;
    // How many "from" tokens there are left to swap
    uint256 remaining;
    // How many "from" tokens need to be traded in each swap
    uint120 rate;
  }

  /// @notice A list of positions that all have the same `to` token
  struct PositionSet {
    // The `to` token
    address token;
    // The position ids
    uint256[] positionIds;
  }

  /**
   * @notice Emitted when a position is terminated
   * @param user The address of the user that terminated the position
   * @param recipientUnswapped The address of the user that will receive the unswapped tokens
   * @param recipientSwapped The address of the user that will receive the swapped tokens
   * @param positionId The id of the position that was terminated
   * @param returnedUnswapped How many "from" tokens were returned to the caller
   * @param returnedSwapped How many "to" tokens were returned to the caller
   */
  event Terminated(
    address indexed user,
    address indexed recipientUnswapped,
    address indexed recipientSwapped,
    uint256 positionId,
    uint256 returnedUnswapped,
    uint256 returnedSwapped
  );

  /**
   * @notice Emitted when a position is created
   * @param depositor The address of the user that creates the position
   * @param owner The address of the user that will own the position
   * @param positionId The id of the position that was created
   * @param fromToken The address of the "from" token
   * @param toToken The address of the "to" token
   * @param swapInterval How frequently the position's swaps should be executed
   * @param rate How many "from" tokens need to be traded in each swap
   * @param startingSwap The number of the swap when the position will be executed for the first time
   * @param lastSwap The number of the swap when the position will be executed for the last time
   * @param permissions The permissions defined for the position
   */
  event Deposited(
    address indexed depositor,
    address indexed owner,
    uint256 positionId,
    address fromToken,
    address toToken,
    uint32 swapInterval,
    uint120 rate,
    uint32 startingSwap,
    uint32 lastSwap,
    IDCAPermissionManager.PermissionSet[] permissions
  );

  /**
   * @notice Emitted when a position is created and extra data is provided
   * @param positionId The id of the position that was created
   * @param data The extra data that was provided
   */
  event Miscellaneous(uint256 positionId, bytes data);

  /**
   * @notice Emitted when a user withdraws all swapped tokens from a position
   * @param withdrawer The address of the user that executed the withdraw
   * @param recipient The address of the user that will receive the withdrawn tokens
   * @param positionId The id of the position that was affected
   * @param token The address of the withdrawn tokens. It's the same as the position's "to" token
   * @param amount The amount that was withdrawn
   */
  event Withdrew(address indexed withdrawer, address indexed recipient, uint256 positionId, address token, uint256 amount);

  /**
   * @notice Emitted when a user withdraws all swapped tokens from many positions
   * @param withdrawer The address of the user that executed the withdraws
   * @param recipient The address of the user that will receive the withdrawn tokens
   * @param positions The positions to withdraw from
   * @param withdrew The total amount that was withdrawn from each token
   */
  event WithdrewMany(address indexed withdrawer, address indexed recipient, PositionSet[] positions, uint256[] withdrew);

  /**
   * @notice Emitted when a position is modified
   * @param user The address of the user that modified the position
   * @param positionId The id of the position that was modified
   * @param rate How many "from" tokens need to be traded in each swap
   * @param startingSwap The number of the swap when the position will be executed for the first time
   * @param lastSwap The number of the swap when the position will be executed for the last time
   */
  event Modified(address indexed user, uint256 positionId, uint120 rate, uint32 startingSwap, uint32 lastSwap);

  /// @notice Thrown when a user tries to create a position with the same `from` & `to`
  error InvalidToken();

  /// @notice Thrown when a user tries to create a position with a swap interval that is not allowed
  error IntervalNotAllowed();

  /// @notice Thrown when a user tries operate on a position that doesn't exist (it might have been already terminated)
  error InvalidPosition();

  /// @notice Thrown when a user tries operate on a position that they don't have access to
  error UnauthorizedCaller();

  /// @notice Thrown when a user tries to create a position with zero swaps
  error ZeroSwaps();

  /// @notice Thrown when a user tries to create a position with zero funds
  error ZeroAmount();

  /// @notice Thrown when a user tries to withdraw a position whose `to` token doesn't match the specified one
  error PositionDoesNotMatchToken();

  /// @notice Thrown when a user tries create or modify a position with an amount too big
  error AmountTooBig();

  /**
   * @notice Returns the permission manager contract
   * @return The contract itself
   */
  function permissionManager() external view returns (IDCAPermissionManager);

  /**
   * @notice Returns total created positions
   * @return The total created positions
   */
  function totalCreatedPositions() external view returns (uint256);

  /**
   * @notice Returns a user position
   * @param positionId The id of the position
   * @return position The position itself
   */
  function userPosition(uint256 positionId) external view returns (UserPosition memory position);

  /**
   * @notice Creates a new position
   * @dev Will revert:
   *      - With ZeroAddress if from, to or owner are zero
   *      - With InvalidToken if from == to
   *      - With ZeroAmount if amount is zero
   *      - With AmountTooBig if amount is too big
   *      - With ZeroSwaps if amountOfSwaps is zero
   *      - With IntervalNotAllowed if swapInterval is not allowed
   * @param from The address of the "from" token
   * @param to The address of the "to" token
   * @param amount How many "from" tokens will be swapped in total
   * @param amountOfSwaps How many swaps to execute for this position
   * @param swapInterval How frequently the position's swaps should be executed
   * @param owner The address of the owner of the position being created
   * @param permissions Extra permissions to add to the position. Can be empty
   * @return positionId The id of the created position
   */
  function deposit(
    address from,
    address to,
    uint256 amount,
    uint32 amountOfSwaps,
    uint32 swapInterval,
    address owner,
    IDCAPermissionManager.PermissionSet[] calldata permissions
  ) external returns (uint256 positionId);

  /**
   * @notice Creates a new position
   * @dev Will revert:
   *      - With ZeroAddress if from, to or owner are zero
   *      - With InvalidToken if from == to
   *      - With ZeroAmount if amount is zero
   *      - With AmountTooBig if amount is too big
   *      - With ZeroSwaps if amountOfSwaps is zero
   *      - With IntervalNotAllowed if swapInterval is not allowed
   * @param from The address of the "from" token
   * @param to The address of the "to" token
   * @param amount How many "from" tokens will be swapped in total
   * @param amountOfSwaps How many swaps to execute for this position
   * @param swapInterval How frequently the position's swaps should be executed
   * @param owner The address of the owner of the position being created
   * @param permissions Extra permissions to add to the position. Can be empty
   * @param miscellaneous Bytes that will be emitted, and associated with the position
   * @return positionId The id of the created position
   */
  function deposit(
    address from,
    address to,
    uint256 amount,
    uint32 amountOfSwaps,
    uint32 swapInterval,
    address owner,
    IDCAPermissionManager.PermissionSet[] calldata permissions,
    bytes calldata miscellaneous
  ) external returns (uint256 positionId);

  /**
   * @notice Withdraws all swapped tokens from a position to a recipient
   * @dev Will revert:
   *      - With InvalidPosition if positionId is invalid
   *      - With UnauthorizedCaller if the caller doesn't have access to the position
   *      - With ZeroAddress if recipient is zero
   * @param positionId The position's id
   * @param recipient The address to withdraw swapped tokens to
   * @return swapped How much was withdrawn
   */
  function withdrawSwapped(uint256 positionId, address recipient) external returns (uint256 swapped);

  /**
   * @notice Withdraws all swapped tokens from multiple positions
   * @dev Will revert:
   *      - With InvalidPosition if any of the position ids are invalid
   *      - With UnauthorizedCaller if the caller doesn't have access to the position to any of the given positions
   *      - With ZeroAddress if recipient is zero
   *      - With PositionDoesNotMatchToken if any of the positions do not match the token in their position set
   * @param positions A list positions, grouped by `to` token
   * @param recipient The address to withdraw swapped tokens to
   * @return withdrawn How much was withdrawn for each token
   */
  function withdrawSwappedMany(PositionSet[] calldata positions, address recipient) external returns (uint256[] memory withdrawn);

  /**
   * @notice Takes the unswapped balance, adds the new deposited funds and modifies the position so that
   * it is executed in newSwaps swaps
   * @dev Will revert:
   *      - With InvalidPosition if positionId is invalid
   *      - With UnauthorizedCaller if the caller doesn't have access to the position
   *      - With AmountTooBig if amount is too big
   * @param positionId The position's id
   * @param amount Amount of funds to add to the position
   * @param newSwaps The new amount of swaps
   */
  function increasePosition(
    uint256 positionId,
    uint256 amount,
    uint32 newSwaps
  ) external;

  /**
   * @notice Withdraws the specified amount from the unswapped balance and modifies the position so that
   * it is executed in newSwaps swaps
   * @dev Will revert:
   *      - With InvalidPosition if positionId is invalid
   *      - With UnauthorizedCaller if the caller doesn't have access to the position
   *      - With ZeroSwaps if newSwaps is zero and amount is not the total unswapped balance
   * @param positionId The position's id
   * @param amount Amount of funds to withdraw from the position
   * @param newSwaps The new amount of swaps
   * @param recipient The address to send tokens to
   */
  function reducePosition(
    uint256 positionId,
    uint256 amount,
    uint32 newSwaps,
    address recipient
  ) external;

  /**
   * @notice Terminates the position and sends all unswapped and swapped balance to the specified recipients
   * @dev Will revert:
   *      - With InvalidPosition if positionId is invalid
   *      - With UnauthorizedCaller if the caller doesn't have access to the position
   *      - With ZeroAddress if recipientUnswapped or recipientSwapped is zero
   * @param positionId The position's id
   * @param recipientUnswapped The address to withdraw unswapped tokens to
   * @param recipientSwapped The address to withdraw swapped tokens to
   * @return unswapped The unswapped balance sent to `recipientUnswapped`
   * @return swapped The swapped balance sent to `recipientSwapped`
   */
  function terminate(
    uint256 positionId,
    address recipientUnswapped,
    address recipientSwapped
  ) external returns (uint256 unswapped, uint256 swapped);
}

/**
 * @title The interface for all swap related matters
 * @notice These methods allow users to get information about the next swap, and how to execute it
 */
interface IDCAHubSwapHandler {
  /// @notice Information about a swap
  struct SwapInfo {
    // The tokens involved in the swap
    TokenInSwap[] tokens;
    // The pairs involved in the swap
    PairInSwap[] pairs;
  }

  /// @notice Information about a token's role in a swap
  struct TokenInSwap {
    // The token's address
    address token;
    // How much will be given of this token as a reward
    uint256 reward;
    // How much of this token needs to be provided by swapper
    uint256 toProvide;
    // How much of this token will be paid to the platform
    uint256 platformFee;
  }

  /// @notice Information about a pair in a swap
  struct PairInSwap {
    // The address of one of the tokens
    address tokenA;
    // The address of the other token
    address tokenB;
    // The total amount of token A swapped in this pair
    uint256 totalAmountToSwapTokenA;
    // The total amount of token B swapped in this pair
    uint256 totalAmountToSwapTokenB;
    // How much is 1 unit of token A when converted to B
    uint256 ratioAToB;
    // How much is 1 unit of token B when converted to A
    uint256 ratioBToA;
    // The swap intervals involved in the swap, represented as a byte
    bytes1 intervalsInSwap;
  }

  /// @notice A pair of tokens, represented by their indexes in an array
  struct PairIndexes {
    // The index of the token A
    uint8 indexTokenA;
    // The index of the token B
    uint8 indexTokenB;
  }

  /**
   * @notice Emitted when a swap is executed
   * @param sender The address of the user that initiated the swap
   * @param rewardRecipient The address that received the reward
   * @param callbackHandler The address that executed the callback
   * @param swapInformation All information related to the swap
   * @param borrowed How much was borrowed
   * @param fee The swap fee at the moment of the swap
   */
  event Swapped(
    address indexed sender,
    address indexed rewardRecipient,
    address indexed callbackHandler,
    SwapInfo swapInformation,
    uint256[] borrowed,
    uint32 fee
  );

  /// @notice Thrown when pairs indexes are not sorted correctly
  error InvalidPairs();

  /// @notice Thrown when trying to execute a swap, but there is nothing to swap
  error NoSwapsToExecute();

  /**
   * @notice Returns all information related to the next swap
   * @dev Will revert with:
   *      - With InvalidTokens if tokens are not sorted, or if there are duplicates
   *      - With InvalidPairs if pairs are not sorted (first by indexTokenA and then indexTokenB), or if indexTokenA >= indexTokenB for any pair
   * @param tokens The tokens involved in the next swap
   * @param pairs The pairs that you want to swap. Each element of the list points to the index of the token in the tokens array
   * @param calculatePrivilegedAvailability Some accounts get privileged availability and can execute swaps before others. This flag provides
   *        the possibility to calculate the next swap information for privileged and non-privileged accounts
   * @param oracleData Bytes to send to the oracle when executing a quote
   * @return swapInformation The information about the next swap
   */
  function getNextSwapInfo(
    address[] calldata tokens,
    PairIndexes[] calldata pairs,
    bool calculatePrivilegedAvailability,
    bytes calldata oracleData
  ) external view returns (SwapInfo memory swapInformation);

  /**
   * @notice Executes a flash swap
   * @dev Will revert with:
   *      - With InvalidTokens if tokens are not sorted, or if there are duplicates
   *      - With InvalidPairs if pairs are not sorted (first by indexTokenA and then indexTokenB), or if indexTokenA >= indexTokenB for any pair
   *      - With Paused if swaps are paused by protocol
   *      - With NoSwapsToExecute if there are no swaps to execute for the given pairs
   *      - With LiquidityNotReturned if the required tokens were not back during the callback
   * @param tokens The tokens involved in the next swap
   * @param pairsToSwap The pairs that you want to swap. Each element of the list points to the index of the token in the tokens array
   * @param rewardRecipient The address to send the reward to
   * @param callbackHandler Address to call for callback (and send the borrowed tokens to)
   * @param borrow How much to borrow of each of the tokens in tokens. The amount must match the position of the token in the tokens array
   * @param callbackData Bytes to send to the caller during the callback
   * @param oracleData Bytes to send to the oracle when executing a quote
   * @return Information about the executed swap
   */
  function swap(
    address[] calldata tokens,
    PairIndexes[] calldata pairsToSwap,
    address rewardRecipient,
    address callbackHandler,
    uint256[] calldata borrow,
    bytes calldata callbackData,
    bytes calldata oracleData
  ) external returns (SwapInfo memory);
}

/**
 * @title The interface for handling all configuration
 * @notice This contract will manage configuration that affects all pairs, swappers, etc
 */
interface IDCAHubConfigHandler {
  /**
   * @notice Emitted when a new oracle is set
   * @param oracle The new oracle contract
   */
  event OracleSet(ITokenPriceOracle oracle);

  /**
   * @notice Emitted when a new swap fee is set
   * @param feeSet The new swap fee
   */
  event SwapFeeSet(uint32 feeSet);

  /**
   * @notice Emitted when new swap intervals are allowed
   * @param swapIntervals The new swap intervals
   */
  event SwapIntervalsAllowed(uint32[] swapIntervals);

  /**
   * @notice Emitted when some swap intervals are no longer allowed
   * @param swapIntervals The swap intervals that are no longer allowed
   */
  event SwapIntervalsForbidden(uint32[] swapIntervals);

  /**
   * @notice Emitted when a new platform fee ratio is set
   * @param platformFeeRatio The new platform fee ratio
   */
  event PlatformFeeRatioSet(uint16 platformFeeRatio);

  /**
   * @notice Emitted when allowed states of tokens are updated
   * @param tokens Array of updated tokens
   * @param allowed Array of new allow state per token were allowed[i] is the updated state of tokens[i]
   */
  event TokensAllowedUpdated(address[] tokens, bool[] allowed);

  /// @notice Thrown when trying to interact with an unallowed token
  error UnallowedToken();

  /// @notice Thrown when set allowed tokens input is not valid
  error InvalidAllowedTokensInput();

  /// @notice Thrown when trying to set a fee higher than the maximum allowed
  error HighFee();

  /// @notice Thrown when trying to set a fee that is not multiple of 100
  error InvalidFee();

  /// @notice Thrown when trying to set a fee ratio that is higher that the maximum allowed
  error HighPlatformFeeRatio();

  /**
   * @notice Returns the max fee ratio that can be set
   * @dev Cannot be modified
   * @return The maximum possible value
   */
  // solhint-disable-next-line func-name-mixedcase
  function MAX_PLATFORM_FEE_RATIO() external view returns (uint16);

  /**
   * @notice Returns the fee charged on swaps
   * @return swapFee The fee itself
   */
  function swapFee() external view returns (uint32 swapFee);

  /**
   * @notice Returns the price oracle contract
   * @return oracle The contract itself
   */
  function oracle() external view returns (ITokenPriceOracle oracle);

  /**
   * @notice Returns how much will the platform take from the fees collected in swaps
   * @return The current ratio
   */
  function platformFeeRatio() external view returns (uint16);

  /**
   * @notice Returns the max fee that can be set for swaps
   * @dev Cannot be modified
   * @return maxFee The maximum possible fee
   */
  // solhint-disable-next-line func-name-mixedcase
  function MAX_FEE() external view returns (uint32 maxFee);

  /**
   * @notice Returns a byte that represents allowed swap intervals
   * @return allowedSwapIntervals The allowed swap intervals
   */
  function allowedSwapIntervals() external view returns (bytes1 allowedSwapIntervals);

  /**
   * @notice Returns if a token is currently allowed or not
   * @return Allowed state of token
   */
  function allowedTokens(address token) external view returns (bool);

  /**
   * @notice Returns token's magnitude (10**decimals)
   * @return Stored magnitude for token
   */
  function tokenMagnitude(address token) external view returns (uint120);

  /**
   * @notice Returns whether swaps and deposits are currently paused
   * @return isPaused Whether swaps and deposits are currently paused
   */
  function paused() external view returns (bool isPaused);

  /**
   * @notice Sets a new swap fee
   * @dev Will revert with HighFee if the fee is higher than the maximum
   * @dev Will revert with InvalidFee if the fee is not multiple of 100
   * @param fee The new swap fee
   */
  function setSwapFee(uint32 fee) external;

  /**
   * @notice Sets a new price oracle
   * @dev Will revert with ZeroAddress if the zero address is passed
   * @param oracle The new oracle contract
   */
  function setOracle(ITokenPriceOracle oracle) external;

  /**
   * @notice Sets a new platform fee ratio
   * @dev Will revert with HighPlatformFeeRatio if given ratio is too high
   * @param platformFeeRatio The new ratio
   */
  function setPlatformFeeRatio(uint16 platformFeeRatio) external;

  /**
   * @notice Adds new swap intervals to the allowed list
   * @param swapIntervals The new swap intervals
   */
  function addSwapIntervalsToAllowedList(uint32[] calldata swapIntervals) external;

  /**
   * @notice Removes some swap intervals from the allowed list
   * @param swapIntervals The swap intervals to remove
   */
  function removeSwapIntervalsFromAllowedList(uint32[] calldata swapIntervals) external;

  /// @notice Pauses all swaps and deposits
  function pause() external;

  /// @notice Unpauses all swaps and deposits
  function unpause() external;
}

/**
 * @title The interface for handling platform related actions
 * @notice This contract will handle all actions that affect the platform in some way
 */
interface IDCAHubPlatformHandler {
  /**
   * @notice Emitted when someone withdraws from the paltform balance
   * @param sender The address of the user that initiated the withdraw
   * @param recipient The address that received the withdraw
   * @param amounts The tokens (and the amount) that were withdrawn
   */
  event WithdrewFromPlatform(address indexed sender, address indexed recipient, IDCAHub.AmountOfToken[] amounts);

  /**
   * @notice Withdraws tokens from the platform balance
   * @param amounts The amounts to withdraw
   * @param recipient The address that will receive the tokens
   */
  function withdrawFromPlatformBalance(IDCAHub.AmountOfToken[] calldata amounts, address recipient) external;
}

interface IDCAHub is IDCAHubParameters, IDCAHubConfigHandler, IDCAHubSwapHandler, IDCAHubPositionHandler, IDCAHubPlatformHandler {
  /// @notice Specifies an amount of a token. For example to determine how much to borrow from certain tokens
  struct AmountOfToken {
    // The tokens' address
    address token;
    // How much to borrow or withdraw of the specified token
    uint256 amount;
  }

  /// @notice Thrown when one of the parameters is a zero address
  error ZeroAddress();

  /// @notice Thrown when the expected liquidity is not returned in flash swaps
  error LiquidityNotReturned();

  /// @notice Thrown when a list of token pairs is not sorted, or if there are duplicates
  error InvalidTokens();
}

File 5 of 20 : IDCAPermissionManager.sol
// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.8.7 <0.9.0;

import '@openzeppelin/contracts/token/ERC721/IERC721.sol';
import '@mean-finance/nft-descriptors/solidity/interfaces/IDCAHubPositionDescriptor.sol';

interface IERC721BasicEnumerable {
  /**
   * @notice Count NFTs tracked by this contract
   * @return A count of valid NFTs tracked by this contract, where each one of
   *         them has an assigned and queryable owner not equal to the zero address
   */
  function totalSupply() external view returns (uint256);
}

/**
 * @title The interface for all permission related matters
 * @notice These methods allow users to set and remove permissions to their positions
 */
interface IDCAPermissionManager is IERC721, IERC721BasicEnumerable {
  /// @notice Set of possible permissions
  enum Permission {
    INCREASE,
    REDUCE,
    WITHDRAW,
    TERMINATE
  }

  /// @notice A set of permissions for a specific operator
  struct PermissionSet {
    // The address of the operator
    address operator;
    // The permissions given to the overator
    Permission[] permissions;
  }

  /// @notice A collection of permissions sets for a specific position
  struct PositionPermissions {
    // The id of the token
    uint256 tokenId;
    // The permissions to assign to the position
    PermissionSet[] permissionSets;
  }

  /**
   * @notice Emitted when permissions for a token are modified
   * @param tokenId The id of the token
   * @param permissions The set of permissions that were updated
   */
  event Modified(uint256 tokenId, PermissionSet[] permissions);

  /**
   * @notice Emitted when the address for a new descritor is set
   * @param descriptor The new descriptor contract
   */
  event NFTDescriptorSet(IDCAHubPositionDescriptor descriptor);

  /// @notice Thrown when a user tries to set the hub, once it was already set
  error HubAlreadySet();

  /// @notice Thrown when a user provides a zero address when they shouldn't
  error ZeroAddress();

  /// @notice Thrown when a user calls a method that can only be executed by the hub
  error OnlyHubCanExecute();

  /// @notice Thrown when a user tries to modify permissions for a token they do not own
  error NotOwner();

  /// @notice Thrown when a user tries to execute a permit with an expired deadline
  error ExpiredDeadline();

  /// @notice Thrown when a user tries to execute a permit with an invalid signature
  error InvalidSignature();

  /**
   * @notice The permit typehash used in the permit signature
   * @return The typehash for the permit
   */
  // solhint-disable-next-line func-name-mixedcase
  function PERMIT_TYPEHASH() external pure returns (bytes32);

  /**
   * @notice The permit typehash used in the permission permit signature
   * @return The typehash for the permission permit
   */
  // solhint-disable-next-line func-name-mixedcase
  function PERMISSION_PERMIT_TYPEHASH() external pure returns (bytes32);

  /**
   * @notice The permit typehash used in the multi permission permit signature
   * @return The typehash for the multi permission permit
   */
  // solhint-disable-next-line func-name-mixedcase
  function MULTI_PERMISSION_PERMIT_TYPEHASH() external pure returns (bytes32);

  /**
   * @notice The permit typehash used in the permission permit signature
   * @return The typehash for the permission set
   */
  // solhint-disable-next-line func-name-mixedcase
  function PERMISSION_SET_TYPEHASH() external pure returns (bytes32);

  /**
   * @notice The permit typehash used in the multi permission permit signature
   * @return The typehash for the position permissions
   */
  // solhint-disable-next-line func-name-mixedcase
  function POSITION_PERMISSIONS_TYPEHASH() external pure returns (bytes32);

  /**
   * @notice The domain separator used in the permit signature
   * @return The domain seperator used in encoding of permit signature
   */
  // solhint-disable-next-line func-name-mixedcase
  function DOMAIN_SEPARATOR() external view returns (bytes32);

  /**
   * @notice Returns the NFT descriptor contract
   * @return The contract for the NFT descriptor
   */
  function nftDescriptor() external returns (IDCAHubPositionDescriptor);

  /**
   * @notice Returns the address of the DCA Hub
   * @return The address of the DCA Hub
   */
  function hub() external returns (address);

  /**
   * @notice Returns the next nonce to use for a given user
   * @param user The address of the user
   * @return nonce The next nonce to use
   */
  function nonces(address user) external returns (uint256 nonce);

  /**
   * @notice Returns whether the given address has the permission for the given token
   * @param id The id of the token to check
   * @param account The address of the user to check
   * @param permission The permission to check
   * @return Whether the user has the permission or not
   */
  function hasPermission(
    uint256 id,
    address account,
    Permission permission
  ) external view returns (bool);

  /**
   * @notice Returns whether the given address has the permissions for the given token
   * @param id The id of the token to check
   * @param account The address of the user to check
   * @param permissions The permissions to check
   * @return hasPermissions Whether the user has each permission or not
   */
  function hasPermissions(
    uint256 id,
    address account,
    Permission[] calldata permissions
  ) external view returns (bool[] memory hasPermissions);

  /**
   * @notice Sets the address for the hub
   * @dev Can only be successfully executed once. Once it's set, it can be modified again
   *      Will revert:
   *      - With ZeroAddress if address is zero
   *      - With HubAlreadySet if the hub has already been set
   * @param hub The address to set for the hub
   */
  function setHub(address hub) external;

  /**
   * @notice Mints a new NFT with the given id, and sets the permissions for it
   * @dev Will revert with OnlyHubCanExecute if the caller is not the hub
   * @param id The id of the new NFT
   * @param owner The owner of the new NFT
   * @param permissions Permissions to set for the new NFT
   */
  function mint(
    uint256 id,
    address owner,
    PermissionSet[] calldata permissions
  ) external;

  /**
   * @notice Burns the NFT with the given id, and clears all permissions
   * @dev Will revert with OnlyHubCanExecute if the caller is not the hub
   * @param id The token's id
   */
  function burn(uint256 id) external;

  /**
   * @notice Sets new permissions for the given position
   * @dev Will revert with NotOwner if the caller is not the token's owner.
   *      Operators that are not part of the given permission sets do not see their permissions modified.
   *      In order to remove permissions to an operator, provide an empty list of permissions for them
   * @param id The token's id
   * @param permissions A list of permission sets
   */
  function modify(uint256 id, PermissionSet[] calldata permissions) external;

  /**
   * @notice Sets new permissions for the given positions
   * @dev This is basically the same as executing multiple `modify`
   * @param permissions A list of position permissions to set
   */
  function modifyMany(PositionPermissions[] calldata permissions) external;

  /**
   * @notice Approves spending of a specific token ID by spender via signature
   * @param spender The account that is being approved
   * @param tokenId The ID of the token that is being approved for spending
   * @param deadline The deadline timestamp by which the call must be mined for the approve to work
   * @param v Must produce valid secp256k1 signature from the holder along with `r` and `s`
   * @param r Must produce valid secp256k1 signature from the holder along with `v` and `s`
   * @param s Must produce valid secp256k1 signature from the holder along with `r` and `v`
   */
  function permit(
    address spender,
    uint256 tokenId,
    uint256 deadline,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) external;

  /**
   * @notice Sets permissions via signature
   * @dev This method works similarly to `modifyMany`, but instead of being executed by the owner, it can be set by signature
   * @param permissions The permissions to set for the different positions
   * @param deadline The deadline timestamp by which the call must be mined for the approve to work
   * @param v Must produce valid secp256k1 signature from the holder along with `r` and `s`
   * @param r Must produce valid secp256k1 signature from the holder along with `v` and `s`
   * @param s Must produce valid secp256k1 signature from the holder along with `r` and `v`
   */
  function multiPermissionPermit(
    PositionPermissions[] calldata permissions,
    uint256 deadline,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) external;

  /**
   * @notice Sets permissions via signature
   * @dev This method works similarly to `modify`, but instead of being executed by the owner, it can be set my signature
   * @param permissions The permissions to set
   * @param tokenId The token's id
   * @param deadline The deadline timestamp by which the call must be mined for the approve to work
   * @param v Must produce valid secp256k1 signature from the holder along with `r` and `s`
   * @param r Must produce valid secp256k1 signature from the holder along with `v` and `s`
   * @param s Must produce valid secp256k1 signature from the holder along with `r` and `v`
   */
  function permissionPermit(
    PermissionSet[] calldata permissions,
    uint256 tokenId,
    uint256 deadline,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) external;

  /**
   * @notice Sets a new NFT descriptor
   * @dev Will revert with ZeroAddress if address is zero
   * @param descriptor The new NFT descriptor contract
   */
  function setNFTDescriptor(IDCAHubPositionDescriptor descriptor) external;
}

File 6 of 20 : PermissionMath.sol
// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.8.7 <0.9.0;

import '../interfaces/IDCAPermissionManager.sol';

/// @title Permission Math library
/// @notice Provides functions to easily convert from permissions to an int representation and viceversa
library PermissionMath {
  /// @notice Takes a list of permissions and returns the int representation of the set that contains them all
  /// @param _permissions The list of permissions
  /// @return _representation The uint representation
  function toUInt8(IDCAPermissionManager.Permission[] memory _permissions) internal pure returns (uint8 _representation) {
    for (uint256 i = 0; i < _permissions.length; ) {
      _representation |= uint8(1 << uint8(_permissions[i]));
      unchecked {
        i++;
      }
    }
  }

  /// @notice Takes an int representation of a set of permissions, and returns whether it contains the given permission
  /// @param _representation The int representation
  /// @param _permission The permission to check for
  /// @return _hasPermission Whether the representation contains the given permission
  function hasPermission(uint8 _representation, IDCAPermissionManager.Permission _permission) internal pure returns (bool _hasPermission) {
    uint256 _bitMask = 1 << uint8(_permission);
    _hasPermission = (_representation & _bitMask) != 0;
  }
}

File 7 of 20 : Governable.sol
// SPDX-License-Identifier: BUSL-1.1

pragma solidity >=0.7.0;

interface IGovernable {
  event PendingGovernorSet(address pendingGovernor);
  event PendingGovernorAccepted();

  function setPendingGovernor(address _pendingGovernor) external;

  function acceptPendingGovernor() external;

  function governor() external view returns (address);

  function pendingGovernor() external view returns (address);

  function isGovernor(address _account) external view returns (bool _isGovernor);

  function isPendingGovernor(address _account) external view returns (bool _isPendingGovernor);
}

abstract contract Governable is IGovernable {
  address private _governor;
  address private _pendingGovernor;

  constructor(address __governor) {
    require(__governor != address(0), 'Governable: zero address');
    _governor = __governor;
  }

  function governor() external view override returns (address) {
    return _governor;
  }

  function pendingGovernor() external view override returns (address) {
    return _pendingGovernor;
  }

  function setPendingGovernor(address __pendingGovernor) external virtual override onlyGovernor {
    _setPendingGovernor(__pendingGovernor);
  }

  function _setPendingGovernor(address __pendingGovernor) internal {
    require(__pendingGovernor != address(0), 'Governable: zero address');
    _pendingGovernor = __pendingGovernor;
    emit PendingGovernorSet(__pendingGovernor);
  }

  function acceptPendingGovernor() external virtual override onlyPendingGovernor {
    _acceptPendingGovernor();
  }

  function _acceptPendingGovernor() internal {
    require(_pendingGovernor != address(0), 'Governable: no pending governor');
    _governor = _pendingGovernor;
    _pendingGovernor = address(0);
    emit PendingGovernorAccepted();
  }

  function isGovernor(address _account) public view override returns (bool _isGovernor) {
    return _account == _governor;
  }

  function isPendingGovernor(address _account) public view override returns (bool _isPendingGovernor) {
    return _account == _pendingGovernor;
  }

  modifier onlyGovernor() {
    require(isGovernor(msg.sender), 'Governable: only governor');
    _;
  }

  modifier onlyPendingGovernor() {
    require(isPendingGovernor(msg.sender), 'Governable: only pending governor');
    _;
  }
}

File 8 of 20 : IERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * 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;

    /**
     * @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 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 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 the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @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);
}

File 9 of 20 : IERC721Receiver.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (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 `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

File 10 of 20 : IERC721Metadata.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {
    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the token collection symbol.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}

File 11 of 20 : Address.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @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
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 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
                /// @solidity memory-safe-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

File 12 of 20 : Context.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (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 13 of 20 : Strings.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @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);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }
}

File 14 of 20 : ERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

File 15 of 20 : IERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (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 16 of 20 : ECDSA.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.3) (utils/cryptography/ECDSA.sol)

pragma solidity ^0.8.0;

import "../Strings.sol";

/**
 * @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 {
    enum RecoverError {
        NoError,
        InvalidSignature,
        InvalidSignatureLength,
        InvalidSignatureS,
        InvalidSignatureV
    }

    function _throwError(RecoverError error) private pure {
        if (error == RecoverError.NoError) {
            return; // no error: do nothing
        } else if (error == RecoverError.InvalidSignature) {
            revert("ECDSA: invalid signature");
        } else if (error == RecoverError.InvalidSignatureLength) {
            revert("ECDSA: invalid signature length");
        } else if (error == RecoverError.InvalidSignatureS) {
            revert("ECDSA: invalid signature 's' value");
        } else if (error == RecoverError.InvalidSignatureV) {
            revert("ECDSA: invalid signature 'v' value");
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature` or error string. 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.
     *
     * Documentation for signature generation:
     * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
     * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
     *
     * _Available since v4.3._
     */
    function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) {
        if (signature.length == 65) {
            bytes32 r;
            bytes32 s;
            uint8 v;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            /// @solidity memory-safe-assembly
            assembly {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
            return tryRecover(hash, v, r, s);
        } else {
            return (address(0), RecoverError.InvalidSignatureLength);
        }
    }

    /**
     * @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) {
        (address recovered, RecoverError error) = tryRecover(hash, signature);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
     *
     * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address, RecoverError) {
        bytes32 s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);
        uint8 v = uint8((uint256(vs) >> 255) + 27);
        return tryRecover(hash, v, r, s);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
     *
     * _Available since v4.2._
     */
    function recover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, r, vs);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `v`,
     * `r` and `s` signature fields separately.
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address, RecoverError) {
        // 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 (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): 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.
        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
            return (address(0), RecoverError.InvalidSignatureS);
        }
        if (v != 27 && v != 28) {
            return (address(0), RecoverError.InvalidSignatureV);
        }

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        if (signer == address(0)) {
            return (address(0), RecoverError.InvalidSignature);
        }

        return (signer, RecoverError.NoError);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function recover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, v, r, s);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from a `hash`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * 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));
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from `s`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n", Strings.toString(s.length), s));
    }

    /**
     * @dev Returns an Ethereum Signed Typed Data, created from a
     * `domainSeparator` and a `structHash`. This produces hash corresponding
     * to the one signed with the
     * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]
     * JSON-RPC method as part of EIP-712.
     *
     * See {recover}.
     */
    function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
    }
}

File 17 of 20 : IERC20Metadata.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

File 18 of 20 : ITokenPriceOracle.sol
// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.5.0;

/**
 * @title The interface for an oracle that provides price quotes
 * @notice These methods allow users to add support for pairs, and then ask for quotes
 */
interface ITokenPriceOracle {
  /// @notice Thrown when trying to add support for a pair that cannot be supported
  error PairCannotBeSupported(address tokenA, address tokenB);

  /// @notice Thrown when trying to execute a quote with a pair that isn't supported yet
  error PairNotSupportedYet(address tokenA, address tokenB);

  /**
   * @notice Returns whether this oracle can support the given pair of tokens
   * @dev tokenA and tokenB may be passed in either tokenA/tokenB or tokenB/tokenA order
   * @param tokenA One of the pair's tokens
   * @param tokenB The other of the pair's tokens
   * @return Whether the given pair of tokens can be supported by the oracle
   */
  function canSupportPair(address tokenA, address tokenB) external view returns (bool);

  /**
   * @notice Returns whether this oracle is already supporting the given pair of tokens
   * @dev tokenA and tokenB may be passed in either tokenA/tokenB or tokenB/tokenA order
   * @param tokenA One of the pair's tokens
   * @param tokenB The other of the pair's tokens
   * @return Whether the given pair of tokens is already being supported by the oracle
   */
  function isPairAlreadySupported(address tokenA, address tokenB) external view returns (bool);

  /**
   * @notice Returns a quote, based on the given tokens and amount
   * @dev Will revert if pair isn't supported
   * @param tokenIn The token that will be provided
   * @param amountIn The amount that will be provided
   * @param tokenOut The token we would like to quote
   * @param data Custom data that the oracle might need to operate
   * @return amountOut How much `tokenOut` will be returned in exchange for `amountIn` amount of `tokenIn`
   */
  function quote(
    address tokenIn,
    uint256 amountIn,
    address tokenOut,
    bytes calldata data
  ) external view returns (uint256 amountOut);

  /**
   * @notice Add or reconfigures the support for a given pair. This function will let the oracle take some actions
   *         to configure the pair, in preparation for future quotes. Can be called many times in order to let the oracle
   *         re-configure for a new context
   * @dev Will revert if pair cannot be supported. tokenA and tokenB may be passed in either tokenA/tokenB or tokenB/tokenA order
   * @param tokenA One of the pair's tokens
   * @param tokenB The other of the pair's tokens
   * @param data Custom data that the oracle might need to operate
   */
  function addOrModifySupportForPair(
    address tokenA,
    address tokenB,
    bytes calldata data
  ) external;

  /**
   * @notice Adds support for a given pair if the oracle didn't support it already. If called for a pair that is already supported,
   *         then nothing will happen. This function will let the oracle take some actions to configure the pair, in preparation
   *         for future quotes
   * @dev Will revert if pair cannot be supported. tokenA and tokenB may be passed in either tokenA/tokenB or tokenB/tokenA order
   * @param tokenA One of the pair's tokens
   * @param tokenB The other of the pair's tokens
   * @param data Custom data that the oracle might need to operate
   */
  function addSupportForPairIfNeeded(
    address tokenA,
    address tokenB,
    bytes calldata data
  ) external;
}

File 19 of 20 : IERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) external returns (bool);
}

File 20 of 20 : IDCAHubPositionDescriptor.sol
// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.8.7 <0.9.0;

/**
 * @title The interface for generating a description for a position in a DCA Hub
 * @notice Contracts that implement this interface must return a base64 JSON with the entire description
 */
interface IDCAHubPositionDescriptor {
  /**
   * @notice Generates a positions's description, both the JSON and the image inside
   * @param hub The address of the DCA Hub
   * @param positionId The token/position id
   * @return description The position's description
   */
  function tokenURI(address hub, uint256 positionId) external view returns (string memory description);
}

Settings
{
  "optimizer": {
    "enabled": true,
    "runs": 9999
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

Contract Security Audit

Contract ABI

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IDCAHubPositionDescriptor","name":"descriptor","type":"address"}],"name":"NFTDescriptorSet","type":"event"},{"anonymous":false,"inputs":[],"name":"PendingGovernorAccepted","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"pendingGovernor","type":"address"}],"name":"PendingGovernorSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[],"name":"DOMAIN_SEPARATOR","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"MULTI_PERMISSION_PERMIT_TYPEHASH","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"PERMISSION_PERMIT_TYPEHASH","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"PERMISSION_SET_TYPEHASH","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"PERMIT_TYPEHASH","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"POSITION_PERMISSIONS_TYPEHASH","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"acceptPendingGovernor","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"approve","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_id","type":"uint256"}],"name":"burn","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getApproved","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"governor","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_id","type":"uint256"},{"internalType":"address","name":"_address","type":"address"},{"internalType":"enum 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IDCAPermissionManager.PermissionSet[]","name":"permissionSets","type":"tuple[]"}],"internalType":"struct IDCAPermissionManager.PositionPermissions[]","name":"_permissions","type":"tuple[]"}],"name":"modifyMany","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"components":[{"internalType":"uint256","name":"tokenId","type":"uint256"},{"components":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"enum IDCAPermissionManager.Permission[]","name":"permissions","type":"uint8[]"}],"internalType":"struct IDCAPermissionManager.PermissionSet[]","name":"permissionSets","type":"tuple[]"}],"internalType":"struct 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IDCAPermissionManager.PermissionSet[]","name":"_permissions","type":"tuple[]"},{"internalType":"uint256","name":"_tokenId","type":"uint256"},{"internalType":"uint256","name":"_deadline","type":"uint256"},{"internalType":"uint8","name":"_v","type":"uint8"},{"internalType":"bytes32","name":"_r","type":"bytes32"},{"internalType":"bytes32","name":"_s","type":"bytes32"}],"name":"permissionPermit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_spender","type":"address"},{"internalType":"uint256","name":"_tokenId","type":"uint256"},{"internalType":"uint256","name":"_deadline","type":"uint256"},{"internalType":"uint8","name":"_v","type":"uint8"},{"internalType":"bytes32","name":"_r","type":"bytes32"},{"internalType":"bytes32","name":"_s","type":"bytes32"}],"name":"permit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"bool","name":"approved","type":"bool"}],"name":"setApprovalForAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_hub","type":"address"}],"name":"setHub","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract IDCAHubPositionDescriptor","name":"_descriptor","type":"address"}],"name":"setNFTDescriptor","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"__pendingGovernor","type":"address"}],"name":"setPendingGovernor","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"address","name":"","type":"address"}],"name":"tokenPermissions","outputs":[{"internalType":"uint8","name":"permissions","type":"uint8"},{"internalType":"uint248","name":"lastUpdated","type":"uint248"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokenId","type":"uint256"}],"name":"tokenURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"transferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

000000000000000000000000308810881807189cae91950888b2cb73a1cc59200000000000000000000000004acd4bc402bc8e6ba8abddca639d8011ef0b8a4b

-----Decoded View---------------
Arg [0] : _governor (address): 0x308810881807189cAe91950888b2cB73A1CC5920
Arg [1] : _descriptor (address): 0x4ACd4BC402bc8e6BA8aBDdcA639d8011ef0b8a4b

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000308810881807189cae91950888b2cb73a1cc5920
Arg [1] : 0000000000000000000000004acd4bc402bc8e6ba8abddca639d8011ef0b8a4b


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