swift-hackathon-2026/StandardsBasedTransferControl.sol

pragma solidity ^0.8.28;

contract Owned {
    address public owner;

    modifier onlyOwner() {
        require(msg.sender == owner, "ONLY_OWNER");
        _;
    }

    constructor() {
        owner = msg.sender;
    }

    function transferOwnership(address newOwner) external onlyOwner {
        require(newOwner != address(0), "ZERO_OWNER");
        owner = newOwner;
    }
}

contract IdentityRegistry is Owned {
    struct Party {
        bytes32 partyId;
        bytes32 accountId;
        bytes32 jurisdiction;
        bool verified;
        bool eligible;
        bool frozen;
    }

    mapping(address => Party) public parties;

    event PartySet(
        address indexed wallet,
        bytes32 partyId,
        bytes32 accountId,
        bytes32 jurisdiction,
        bool verified,
        bool eligible,
        bool frozen
    );

    function setParty(
        address wallet,
        bytes32 partyId,
        bytes32 accountId,
        bytes32 jurisdiction,
        bool verified,
        bool eligible,
        bool frozen
    ) external onlyOwner {
        parties[wallet] = Party({
            partyId: partyId,
            accountId: accountId,
            jurisdiction: jurisdiction,
            verified: verified,
            eligible: eligible,
            frozen: frozen
        });

        emit PartySet(wallet, partyId, accountId, jurisdiction, verified, eligible, frozen);
    }

    function setFrozen(address wallet, bool frozen) external onlyOwner {
        parties[wallet].frozen = frozen;
        emit PartySet(
            wallet,
            parties[wallet].partyId,
            parties[wallet].accountId,
            parties[wallet].jurisdiction,
            parties[wallet].verified,
            parties[wallet].eligible,
            frozen
        );
    }

    function getParty(address wallet) external view returns (Party memory) {
        return parties[wallet];
    }
}

contract RoleRegistry is Owned {
    mapping(bytes32 => mapping(address => bool)) public hasRole;

    event RoleSet(bytes32 indexed role, address indexed account, bool enabled);

    function setRole(bytes32 role, address account, bool enabled) external onlyOwner {
        hasRole[role][account] = enabled;
        emit RoleSet(role, account, enabled);
    }
}

contract PolicyRegistry is Owned {
    struct Policy {
        bool active;
        bool lockupActive;
        uint256 maxAutoApproveQuantity;
    }

    mapping(bytes32 => Policy) public policies;

    event PolicySet(
        bytes32 indexed policyId,
        bool active,
        bool lockupActive,
        uint256 maxAutoApproveQuantity
    );

    function setPolicy(
        bytes32 policyId,
        bool active,
        bool lockupActive,
        uint256 maxAutoApproveQuantity
    ) external onlyOwner {
        policies[policyId] = Policy({
            active: active,
            lockupActive: lockupActive,
            maxAutoApproveQuantity: maxAutoApproveQuantity
        });

        emit PolicySet(policyId, active, lockupActive, maxAutoApproveQuantity);
    }

    function getPolicy(bytes32 policyId) external view returns (Policy memory) {
        return policies[policyId];
    }
}

contract TransferControlModule is Owned {
    enum Decision {
        Approved,
        Rejected,
        PendingReview
    }

    struct ControlRequest {
        bytes32 instructionId;
        bytes32 messageDefinitionId;
        bytes32 lifecycleEvent;
        bytes32 assetId;
        bytes32 assetType;
        address assetContract;
        bytes32 networkId;
        address fromWallet;
        address toWallet;
        uint256 quantity;
        bytes32 policyId;
    }

    struct ControlDecision {
        Decision decision;
        bytes32 reasonCode;
        bytes32 policyId;
        bytes32 evidenceRef;
    }

    bytes32 public constant SECONDARY_TRANSFER = keccak256("SECONDARY_TRANSFER");
    bytes32 public constant APPROVED = keccak256("APPROVED");
    bytes32 public constant FROM_NOT_VERIFIED = keccak256("FROM_NOT_VERIFIED");
    bytes32 public constant TO_NOT_VERIFIED = keccak256("TO_NOT_VERIFIED");
    bytes32 public constant PARTY_FROZEN = keccak256("PARTY_FROZEN");
    bytes32 public constant ASSET_NOT_ALLOWED = keccak256("ASSET_NOT_ALLOWED");
    bytes32 public constant LOCKUP_ACTIVE = keccak256("LOCKUP_ACTIVE");
    bytes32 public constant POLICY_BLOCKED = keccak256("POLICY_BLOCKED");
    bytes32 public constant REVIEW_REQUIRED = keccak256("REVIEW_REQUIRED");
    bytes32 public constant UNSUPPORTED_LIFECYCLE_EVENT = keccak256("UNSUPPORTED_LIFECYCLE_EVENT");

    IdentityRegistry public identityRegistry;
    PolicyRegistry public policyRegistry;

    constructor(address identityRegistry_, address policyRegistry_) {
        identityRegistry = IdentityRegistry(identityRegistry_);
        policyRegistry = PolicyRegistry(policyRegistry_);
    }

    function evaluate(ControlRequest calldata request)
        external
        view
        returns (ControlDecision memory)
    {
        if (request.lifecycleEvent != SECONDARY_TRANSFER) {
            return _decision(Decision.Rejected, UNSUPPORTED_LIFECYCLE_EVENT, request.policyId);
        }

        IdentityRegistry.Party memory fromParty = identityRegistry.getParty(request.fromWallet);
        IdentityRegistry.Party memory toParty = identityRegistry.getParty(request.toWallet);
        PolicyRegistry.Policy memory policy = policyRegistry.getPolicy(request.policyId);

        if (!fromParty.verified) {
            return _decision(Decision.Rejected, FROM_NOT_VERIFIED, request.policyId);
        }

        if (!toParty.verified) {
            return _decision(Decision.Rejected, TO_NOT_VERIFIED, request.policyId);
        }

        if (fromParty.frozen || toParty.frozen) {
            return _decision(Decision.Rejected, PARTY_FROZEN, request.policyId);
        }

        if (!toParty.eligible) {
            return _decision(Decision.Rejected, ASSET_NOT_ALLOWED, request.policyId);
        }

        if (!policy.active) {
            return _decision(Decision.Rejected, POLICY_BLOCKED, request.policyId);
        }

        if (policy.lockupActive) {
            return _decision(Decision.Rejected, LOCKUP_ACTIVE, request.policyId);
        }

        if (request.quantity > policy.maxAutoApproveQuantity) {
            return _decision(Decision.PendingReview, REVIEW_REQUIRED, request.policyId);
        }

        return _decision(Decision.Approved, APPROVED, request.policyId);
    }

    function _decision(Decision decision, bytes32 reasonCode, bytes32 policyId)
        internal
        pure
        returns (ControlDecision memory)
    {
        return ControlDecision({
            decision: decision,
            reasonCode: reasonCode,
            policyId: policyId,
            evidenceRef: keccak256("SYNTHETIC_EVIDENCE")
        });
    }
}

contract TokenizedBond is Owned {
    string public name;
    string public symbol;
    uint8 public decimals = 0;
    uint256 public totalSupply;
    bytes32 public assetId;
    bytes32 public assetType;
    bytes32 public messageDefinitionId;
    bytes32 public networkId;
    bytes32 public policyId;

    bytes32 public constant TRANSFER_AGENT_ROLE = keccak256("TRANSFER_AGENT_ROLE");
    bytes32 public constant SECONDARY_TRANSFER = keccak256("SECONDARY_TRANSFER");
    bytes32 public constant INSUFFICIENT_POSITION = keccak256("INSUFFICIENT_POSITION");

    TransferControlModule public controlModule;
    RoleRegistry public roleRegistry;

    mapping(address => uint256) public balanceOf;

    event Transfer(address indexed from, address indexed to, uint256 value);
    event TransferControlDecision(
        bytes32 indexed instructionId,
        address indexed fromWallet,
        address indexed toWallet,
        uint8 decision,
        bytes32 reasonCode,
        bytes32 policyId,
        bytes32 messageDefinitionId,
        bytes32 assetType,
        bytes32 networkId
    );

    modifier onlyTransferAgent() {
        require(
            msg.sender == owner || roleRegistry.hasRole(TRANSFER_AGENT_ROLE, msg.sender),
            "ONLY_TRANSFER_AGENT"
        );
        _;
    }

    constructor(
        string memory name_,
        string memory symbol_,
        bytes32 assetId_,
        bytes32 assetType_,
        bytes32 messageDefinitionId_,
        bytes32 networkId_,
        bytes32 policyId_,
        address controlModule_,
        address roleRegistry_,
        address initialHolder,
        uint256 initialSupply
    ) {
        name = name_;
        symbol = symbol_;
        assetId = assetId_;
        assetType = assetType_;
        messageDefinitionId = messageDefinitionId_;
        networkId = networkId_;
        policyId = policyId_;
        controlModule = TransferControlModule(controlModule_);
        roleRegistry = RoleRegistry(roleRegistry_);
        balanceOf[initialHolder] = initialSupply;
        totalSupply = initialSupply;
        emit Transfer(address(0), initialHolder, initialSupply);
    }

    function controlledTransfer(
        bytes32 instructionId,
        address fromWallet,
        address toWallet,
        uint256 quantity
    ) external onlyTransferAgent returns (uint8, bytes32) {
        if (balanceOf[fromWallet] < quantity) {
            emit TransferControlDecision(
                instructionId,
                fromWallet,
                toWallet,
                uint8(TransferControlModule.Decision.Rejected),
                INSUFFICIENT_POSITION,
                policyId,
                messageDefinitionId,
                assetType,
                networkId
            );
            return (uint8(TransferControlModule.Decision.Rejected), INSUFFICIENT_POSITION);
        }

        TransferControlModule.ControlRequest memory request =
            TransferControlModule.ControlRequest({
                instructionId: instructionId,
                messageDefinitionId: messageDefinitionId,
                lifecycleEvent: SECONDARY_TRANSFER,
                assetId: assetId,
                assetType: assetType,
                assetContract: address(this),
                networkId: networkId,
                fromWallet: fromWallet,
                toWallet: toWallet,
                quantity: quantity,
                policyId: policyId
            });

        TransferControlModule.ControlDecision memory decision = controlModule.evaluate(request);

        if (decision.decision == TransferControlModule.Decision.Approved) {
            balanceOf[fromWallet] -= quantity;
            balanceOf[toWallet] += quantity;
            emit Transfer(fromWallet, toWallet, quantity);
        }

        emit TransferControlDecision(
            instructionId,
            fromWallet,
            toWallet,
            uint8(decision.decision),
            decision.reasonCode,
            decision.policyId,
            messageDefinitionId,
            assetType,
            networkId
        );

        return (uint8(decision.decision), decision.reasonCode);
    }
}