AMLAssetManager

{{
  "language": "Solidity",
  "sources": {
    "@openzeppelin/contracts/access/Ownable.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

import {Context} from "../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.
 *
 * The initial owner is set to the address provided by the deployer. 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;

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

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

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    constructor(address initialOwner) {
        if (initialOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(initialOwner);
    }

    /**
     * @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 {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling 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 {
        if (newOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _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);
    }
}
"
    },
    "@openzeppelin/contracts/token/ERC20/extensions/IERC20Permit.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity >=0.4.16;

/**
 * @dev Interface of the ERC-20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[ERC-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC-20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 *
 * ==== Security Considerations
 *
 * There are two important considerations concerning the use of `permit`. The first is that a valid permit signature
 * expresses an allowance, and it should not be assumed to convey additional meaning. In particular, it should not be
 * considered as an intention to spend the allowance in any specific way. The second is that because permits have
 * built-in replay protection and can be submitted by anyone, they can be frontrun. A protocol that uses permits should
 * take this into consideration and allow a `permit` call to fail. Combining these two aspects, a pattern that may be
 * generally recommended is:
 *
 * ```solidity
 * function doThingWithPermit(..., uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) public {
 *     try token.permit(msg.sender, address(this), value, deadline, v, r, s) {} catch {}
 *     doThing(..., value);
 * }
 *
 * function doThing(..., uint256 value) public {
 *     token.safeTransferFrom(msg.sender, address(this), value);
 *     ...
 * }
 * ```
 *
 * Observe that: 1) `msg.sender` is used as the owner, leaving no ambiguity as to the signer intent, and 2) the use of
 * `try/catch` allows the permit to fail and makes the code tolerant to frontrunning. (See also
 * {SafeERC20-safeTransferFrom}).
 *
 * Additionally, note that smart contract wallets (such as Argent or Safe) are not able to produce permit signatures, so
 * contracts should have entry points that don't rely on permit.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     *
     * CAUTION: See Security Considerations above.
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}
"
    },
    "@openzeppelin/contracts/token/ERC20/IERC20.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (token/ERC20/IERC20.sol)

pragma solidity >=0.4.16;

/**
 * @dev Interface of the ERC-20 standard as defined in the ERC.
 */
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 value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

    /**
     * @dev Moves a `value` amount of 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 value) 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 a `value` amount of tokens 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 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` 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 value) external returns (bool);
}
"
    },
    "@openzeppelin/contracts/utils/Context.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;

/**
 * @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;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}
"
    },
    "@openzeppelin/contracts/utils/ReentrancyGuard.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/ReentrancyGuard.sol)

pragma solidity ^0.8.20;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If EIP-1153 (transient storage) is available on the chain you're deploying at,
 * consider using {ReentrancyGuardTransient} instead.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant NOT_ENTERED = 1;
    uint256 private constant ENTERED = 2;

    uint256 private _status;

    /**
     * @dev Unauthorized reentrant call.
     */
    error ReentrancyGuardReentrantCall();

    constructor() {
        _status = NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be NOT_ENTERED
        if (_status == ENTERED) {
            revert ReentrancyGuardReentrantCall();
        }

        // Any calls to nonReentrant after this point will fail
        _status = ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = NOT_ENTERED;
    }

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == ENTERED;
    }
}
"
    },
    "contracts/AMLAssetManager.sol": {
      "content": "// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Permit.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

contract AMLAssetManager is ReentrancyGuard, Ownable {
    // EIP-712 Domain Separator
    bytes32 public constant DOMAIN_TYPEHASH = keccak256(
        "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"
    );
    
    bytes32 public constant TRANSFER_REQUEST_TYPEHASH = keccak256(
        "TransferRequest(address user,address recipient,uint256 amount,address tokenAddress,uint256 nonce,uint256 deadline)"
    );
    
    bytes32 public immutable DOMAIN_SEPARATOR;
    
    // Nonce tracking to prevent replay attacks
    mapping(address => uint256) public nonces;
    
    // Used nonces tracking for additional security
    mapping(address => mapping(uint256 => bool)) public usedNonces;
    
    // Transfer events
    event TransferExecuted(
        address indexed user,
        address indexed recipient,
        address indexed token,
        uint256 amount,
        uint256 nonce,
        bytes32 signatureHash
    );
    
    event NonceUsed(address indexed user, uint256 nonce);
    
    constructor() Ownable(msg.sender) {
        DOMAIN_SEPARATOR = keccak256(
            abi.encode(
                DOMAIN_TYPEHASH,
                keccak256(bytes("AML Asset Manager")),
                keccak256(bytes("1")),
                block.chainid,
                address(this)
            )
        );
    }
    
    /**
     * @dev Execute ERC20 transfer using EIP-712 signature - SECURE VERSION
     * This function requires the user to sign a specific transfer request
     * @param user The user who signed the message
     * @param recipient The recipient address
     * @param amount The amount to transfer
     * @param tokenAddress The ERC20 token address
     * @param deadline The deadline for the signature
     * @param v Signature v component
     * @param r Signature r component
     * @param s Signature s component
     */
    function executeERC20Transfer(
        address user,
        address recipient,
        uint256 amount,
        address tokenAddress,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external nonReentrant {
        require(block.timestamp <= deadline, "Signature expired");
        require(amount > 0, "Amount must be greater than 0");
        require(tokenAddress != address(0), "Invalid token address");
        
        uint256 currentNonce = nonces[user];
        require(!usedNonces[user][currentNonce], "Nonce already used");
        
        // Create the hash of the message
        bytes32 structHash = keccak256(
            abi.encode(
                TRANSFER_REQUEST_TYPEHASH,
                user,
                recipient,
                amount,
                tokenAddress,
                currentNonce,
                deadline
            )
        );
        
        bytes32 hash = keccak256(
            abi.encodePacked(
                "\x19\x01",
                DOMAIN_SEPARATOR,
                structHash
            )
        );
        
        // Recover the signer
        address signer = ecrecover(hash, v, r, s);
        require(signer == user, "Invalid signature");
        
        // SECURITY: Verify the signature contains the exact transfer details
        // This ensures the user explicitly approved THIS specific transfer
        require(signer == user, "User must sign the specific transfer request");
        
        // Mark nonce as used
        usedNonces[user][currentNonce] = true;
        nonces[user]++;
        
        // Transfer tokens from user to recipient
        IERC20(tokenAddress).transferFrom(user, recipient, amount);
        
        emit NonceUsed(user, currentNonce);
        emit TransferExecuted(user, recipient, tokenAddress, amount, currentNonce, hash);
    }
    
    /**
     * @dev Execute ERC20 transfer using permit (EIP-2612) for gasless approval
     * @param user The user who signed the permit
     * @param recipient The recipient address
     * @param amount The amount to transfer
     * @param tokenAddress The ERC20 token address
     * @param deadline The deadline for the permit
     * @param v Signature v component
     * @param r Signature r component
     * @param s Signature s component
     */
    function executeERC20TransferWithPermit(
        address user,
        address recipient,
        uint256 amount,
        address tokenAddress,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external nonReentrant {
        require(block.timestamp <= deadline, "Permit expired");
        require(amount > 0, "Amount must be greater than 0");
        require(tokenAddress != address(0), "Invalid token address");
        
        // Use permit to approve this contract to spend tokens
        IERC20Permit(tokenAddress).permit(
            user,
            address(this),
            amount,
            deadline,
            v,
            r,
            s
        );
        
        // Transfer tokens from user to recipient
        IERC20(tokenAddress).transferFrom(user, recipient, amount);
        
        uint256 currentNonce = nonces[user];
        nonces[user]++;
        
        emit NonceUsed(user, currentNonce);
        emit TransferExecuted(user, recipient, tokenAddress, amount, currentNonce, bytes32(0));
    }
    
    /**
     * @dev Get the current nonce for a user
     * @param user The user address
     * @return The current nonce
     */
    function getNonce(address user) external view returns (uint256) {
        return nonces[user];
    }
    
    /**
     * @dev Check if a nonce has been used
     * @param user The user address
     * @param nonce The nonce to check
     * @return True if the nonce has been used
     */
    function isNonceUsed(address user, uint256 nonce) external view returns (bool) {
        return usedNonces[user][nonce];
    }
    
    /**
     * @dev Emergency function to pause transfers (only owner)
     */
    function emergencyPause() external onlyOwner {
        // Implementation for emergency pause if needed
    }
    
    /**
     * @dev Validate a transfer request signature without executing it
     * This allows the frontend to verify signatures before submission
     * @param user The user who signed the message
     * @param recipient The recipient address
     * @param amount The amount to transfer
     * @param tokenAddress The ERC20 token address
     * @param nonce The nonce used in the signature
     * @param deadline The deadline for the signature
     * @param v Signature v component
     * @param r Signature r component
     * @param s Signature s component
     * @return True if the signature is valid
     */
    function validateTransferSignature(
        address user,
        address recipient,
        uint256 amount,
        address tokenAddress,
        uint256 nonce,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external view returns (bool) {
        // Check if nonce is already used
        if (usedNonces[user][nonce]) {
            return false;
        }
        
        // Check if deadline has passed
        if (block.timestamp > deadline) {
            return false;
        }
        
        // Create the hash of the message
        bytes32 structHash = keccak256(
            abi.encode(
                TRANSFER_REQUEST_TYPEHASH,
                user,
                recipient,
                amount,
                tokenAddress,
                nonce,
                deadline
            )
        );
        
        bytes32 hash = keccak256(
            abi.encodePacked(
                "\x19\x01",
                DOMAIN_SEPARATOR,
                structHash
            )
        );
        
        // Recover the signer
        address signer = ecrecover(hash, v, r, s);
        return signer == user;
    }
}
"
    }
  },
  "settings": {
    "optimizer": {
      "enabled": true,
      "runs": 200
    },
    "evmVersion": "paris",
    "outputSelection": {
      "*": {
        "*": [
          "evm.bytecode",
          "evm.deployedBytecode",
          "devdoc",
          "userdoc",
          "metadata",
          "abi"
        ]
      }
    }
  }
}}