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0x5CA4b29f06D50635430AaB2227C9a7d6475b8e87

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Contract Source Code Verified (Exact Match)

Contract Name:
ERC20Module

Compiler Version
v0.8.19+commit.7dd6d404

Optimization Enabled:
Yes with 500 runs

Other Settings:
default evmVersion
File 1 of 8 : ERC20Module.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.19;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

import "../interfaces/core/IModule.sol";
import "../helpers/Utils.sol";
import { AddressProvider } from "../main/AddressProvider.sol";
import "../interfaces/main/ICyanVaultV2.sol";

/// @title Cyan Wallet ERC20 Module - A Cyan wallet's ERC20 token handling module.
/// @author Bulgantamir Gankhuyag - <[email protected]>
/// @author Naranbayar Uuganbayar - <[email protected]>
contract ERC20Module is IModule {
    AddressProvider private constant addressProvider = AddressProvider(0xCF9A19D879769aDaE5e4f31503AAECDa82568E55);

    // keccak256("wallet.ERC20Module.lockedERC20")
    bytes32 private constant LOCKER_SLOT = 0x7f4f1b59be841ba41f04a1366e54ff13c51165e7bf98fa5b51c1abe9f816a09e;

    bytes4 private constant ERC20_TRANSFER = IERC20.transfer.selector;
    bytes4 private constant ERC20_APPROVE = IERC20.approve.selector;
    bytes4 private constant ERC20_INCREASE_ALLOWANCE = bytes4(keccak256("increaseAllowance(address,uint256)"));
    bytes4 private constant ERC20_DECREASE_ALLOWANCE = bytes4(keccak256("decreaseAllowance(address,uint256)"));

    event SetLockedERC20Token(address collection, uint256 amount);

    /// @notice Locks ERC20 tokens.
    /// @param collection Token address.
    /// @param amount Token amount to be locked.
    function setLockedERC20Token(address collection, uint256 amount) external {
        uint256 balance = IERC20(collection).balanceOf(address(this));
        uint256 lockedAmount = getLockedAmount(collection);
        require(lockedAmount + amount <= balance, "Cannot perform this action on locked token.");

        _getLockedTokens()[collection] = amount;
        emit SetLockedERC20Token(collection, amount);
    }

    /// @inheritdoc IModule
    function handleTransaction(
        address to,
        uint256 value,
        bytes calldata data
    ) external payable override returns (bytes memory) {
        bytes4 funcHash = Utils.parseFunctionSelector(data);
        if (
            funcHash == ERC20_TRANSFER ||
            funcHash == ERC20_APPROVE ||
            funcHash == ERC20_INCREASE_ALLOWANCE ||
            funcHash == ERC20_DECREASE_ALLOWANCE
        ) {
            uint256 amount = Utils.getUint256At(data, 0x24);
            require(_isAvailable(to, amount), "Cannot perform this action on locked token or balance not enough.");
        }
        return Utils._execute(to, value, data);
    }

    /// @notice Allows operators to get the defaulted tokens.
    ///     Note: Can only transfer if token is locked.
    /// @param collection Collection address.
    /// @param amount Amount.
    /// @param to Receiver address.
    function transferDefaultedERC20(
        address collection,
        uint256 amount,
        address to
    ) external returns (bytes memory) {
        require(_getLockedTokens()[collection] >= amount, "Cannot perform this action on non-locked token.");
        _getLockedTokens()[collection] -= amount;

        bytes memory data = abi.encodeWithSelector(ERC20_TRANSFER, to, amount);
        return Utils._execute(collection, 0, data);
    }

    /// @notice Returns locked amount of the collection.
    /// @param collection Collection address.
    /// @return amount Locked amount.
    function getLockedAmount(address collection) public view returns (uint256) {
        return _getLockedTokens()[collection];
    }

    /// @dev Returns the map of the locked tokens.
    /// @return result Map of the locked tokens.
    ///     Note: Collection address => Locked amount
    function _getLockedTokens() internal pure returns (mapping(address => uint256) storage result) {
        assembly {
            result.slot := LOCKER_SLOT
        }
    }

    /// @dev Checks the amount of non-locked tokens available in the wallet.
    /// @param collection Address of the collection.
    /// @param amount Requesting amount.
    /// @return Boolean to give truthy if requested amount of non-locked tokens are available.
    function _isAvailable(address collection, uint256 amount) internal view returns (bool) {
        address vaultAddress = addressProvider.addresses(bytes32(uint256(uint160(collection))));
        if (vaultAddress != address(0)) {
            // ERC20 token is Cyan Vault Token
            return ICyanVaultV2(vaultAddress).withdrawLocked(address(this)) <= block.timestamp;
        }

        uint256 balance = IERC20(collection).balanceOf(address(this));
        uint256 lockedAmount = getLockedAmount(collection);
        return lockedAmount + amount <= balance;
    }
}

File 2 of 8 : Ownable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

File 3 of 8 : 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 4 of 8 : 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 5 of 8 : Utils.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.19;

library Utils {
    /// @notice Executes a transaction to the given address.
    /// @param to Target address.
    /// @param value Native token value to be sent to the address.
    /// @param data Data to be sent to the address.
    /// @return result Result of the transaciton.
    function _execute(
        address to,
        uint256 value,
        bytes memory data
    ) internal returns (bytes memory result) {
        assembly {
            let success := call(gas(), to, value, add(data, 0x20), mload(data), 0, 0)

            mstore(result, returndatasize())
            returndatacopy(add(result, 0x20), 0, returndatasize())

            if eq(success, 0) {
                revert(add(result, 0x20), returndatasize())
            }
        }
    }

    /// @notice Recover signer address from signature.
    /// @param signedHash Arbitrary length data signed on the behalf of the wallet.
    /// @param signature Signature byte array associated with signedHash.
    /// @return Recovered signer address.
    function recoverSigner(bytes32 signedHash, bytes memory signature) internal pure returns (address) {
        uint8 v;
        bytes32 r;
        bytes32 s;
        // we jump 32 (0x20) as the first slot of bytes contains the length
        // we jump 65 (0x41) per signature
        // for v we load 32 bytes ending with v (the first 31 come from s) then apply a mask
        assembly {
            r := mload(add(signature, 0x20))
            s := mload(add(signature, 0x40))
            v := byte(0, mload(add(signature, 0x60)))
        }
        require(v == 27 || v == 28, "Bad v value in signature.");

        address recoveredAddress = ecrecover(signedHash, v, r, s);
        require(recoveredAddress != address(0), "ecrecover returned 0.");
        return recoveredAddress;
    }

    /// @notice Helper method to parse the function selector from data.
    /// @param data Any data to be parsed, mostly calldata of transaction.
    /// @return result Parsed function sighash.
    function parseFunctionSelector(bytes memory data) internal pure returns (bytes4 result) {
        require(data.length >= 4, "Invalid data.");
        assembly {
            result := mload(add(data, 0x20))
        }
    }

    /// @notice Parse uint256 from given data.
    /// @param data Any data to be parsed, mostly calldata of transaction.
    /// @param position Position in the data.
    /// @return result Uint256 parsed from given data.
    function getUint256At(bytes memory data, uint8 position) internal pure returns (uint256 result) {
        assembly {
            result := mload(add(data, add(position, 0x20)))
        }
    }
}

File 6 of 8 : IModule.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.19;

interface IModule {
    /// @notice Executes given transaction data to given address.
    /// @param to Target contract address.
    /// @param value Value of the given transaction.
    /// @param data Calldata of the transaction.
    /// @return Result of the execution.
    function handleTransaction(
        address to,
        uint256 value,
        bytes calldata data
    ) external payable returns (bytes memory);
}

File 7 of 8 : ICyanVaultV2.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.19;

interface ICyanVaultV2 {
    function getCurrencyAddress() external view returns (address);

    function lend(address to, uint256 amount) external;

    function earn(uint256 amount, uint256 profit) external payable;

    function nftDefaulted(uint256 unpaidAmount, uint256 estimatedPriceOfNFT) external;

    function withdrawLocked(address cyanWalletAddress) external view returns (uint256);
}

File 8 of 8 : AddressProvider.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.19;

import { Ownable } from "@openzeppelin/contracts/access/Ownable.sol";

/// @title Cyan AddressProvider contract
/// @author Bulgantamir Gankhuyag - <[email protected]>
/// @author Naranbayar Uuganbayar - <[email protected]>
contract AddressProvider is Ownable {
    error AddressNotFound(bytes32 id);

    event AddressSet(bytes32 id, address newAddress);

    mapping(bytes32 => address) public addresses;

    constructor(address owner) {
        transferOwnership(owner);
    }

    // @dev Sets an address for an id replacing the address saved in the addresses map
    // @param id The id
    // @param newAddress The address to set
    function setAddress(bytes32 id, address newAddress) external onlyOwner {
        addresses[id] = newAddress;
        emit AddressSet(id, newAddress);
    }
}

Settings
{
  "optimizer": {
    "enabled": true,
    "runs": 500
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

Contract Security Audit

Contract ABI

[{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"collection","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"SetLockedERC20Token","type":"event"},{"inputs":[{"internalType":"address","name":"collection","type":"address"}],"name":"getLockedAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"handleTransaction","outputs":[{"internalType":"bytes","name":"","type":"bytes"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"collection","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"setLockedERC20Token","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"collection","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"address","name":"to","type":"address"}],"name":"transferDefaultedERC20","outputs":[{"internalType":"bytes","name":"","type":"bytes"}],"stateMutability":"nonpayable","type":"function"}]

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Deployed Bytecode

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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.