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// SPDX-License-Identifier: GPL-3.0-only

pragma solidity 0.7.4;

pragma experimental ABIEncoderV2;

import "./utils/AccessControl.sol";
import "./utils/Pausable.sol";
import "./utils/SafeMath.sol";
import "./interfaces/IDepositExecute.sol";
import "./interfaces/IBridge.sol";
import "./interfaces/IERCHandler.sol";
import "./interfaces/IGenericHandler.sol";

/**
    @title Facilitates deposits, creation and votiing of deposit proposals, and deposit executions.
    @author ChainSafe Systems.
 */
contract Bridge is Pausable, AccessControl, SafeMath {

    uint8   public _chainID;
    uint256 public _relayerThreshold;
    uint256 public _totalRelayers;
    uint256 public _totalProposals;
    uint256 public _fee;
    uint256 public _expiry;

    enum Vote {No, Yes}

    enum ProposalStatus {Inactive, Active, Passed, Executed, Cancelled}

    struct Proposal {
        bytes32 _resourceID;
        bytes32 _dataHash;
        address[] _yesVotes;
        address[] _noVotes;
        ProposalStatus _status;
        uint256 _proposedBlock;
    }

    // destinationChainID => number of deposits
    mapping(uint8 => uint64) public _depositCounts;
    // resourceID => handler address
    mapping(bytes32 => address) public _resourceIDToHandlerAddress;
    // depositNonce => destinationChainID => bytes
    mapping(uint64 => mapping(uint8 => bytes)) public _depositRecords;
    // destinationChainID + depositNonce => dataHash => Proposal
    mapping(uint72 => mapping(bytes32 => Proposal)) public _proposals;
    // destinationChainID + depositNonce => dataHash => relayerAddress => bool
    mapping(uint72 => mapping(bytes32 => mapping(address => bool))) public _hasVotedOnProposal;

    event RelayerThresholdChanged(uint indexed newThreshold);
    event RelayerAdded(address indexed relayer);
    event RelayerRemoved(address indexed relayer);
    event Deposit(
        uint8   indexed destinationChainID,
        bytes32 indexed resourceID,
        uint64  indexed depositNonce
    );
    event ProposalEvent(
        uint8           indexed originChainID,
        uint64          indexed depositNonce,
        ProposalStatus  indexed status,
        bytes32 resourceID,
        bytes32 dataHash
    );

    event ProposalVote(
        uint8   indexed originChainID,
        uint64  indexed depositNonce,
        ProposalStatus indexed status,
        bytes32 resourceID
    );

    bytes32 public constant RELAYER_ROLE = keccak256("RELAYER_ROLE");

    modifier onlyAdmin() {
        _onlyAdmin();
        _;
    }

    modifier onlyAdminOrRelayer() {
        _onlyAdminOrRelayer();
        _;
    }

    modifier onlyRelayers() {
        _onlyRelayers();
        _;
    }

    function _onlyAdminOrRelayer() private {
        require(hasRole(DEFAULT_ADMIN_ROLE, msg.sender) || hasRole(RELAYER_ROLE, msg.sender),
            "sender is not relayer or admin");
    }

    function _onlyAdmin() private {
        require(hasRole(DEFAULT_ADMIN_ROLE, msg.sender), "sender doesn't have admin role");
    }

    function _onlyRelayers() private {
        require(hasRole(RELAYER_ROLE, msg.sender), "sender doesn't have relayer role");
    }

    /**
        @notice Initializes Bridge, creates and grants {msg.sender} the admin role,
        creates and grants {initialRelayers} the relayer role.
        @param chainID ID of chain the Bridge contract exists on.
        @param initialRelayers Addresses that should be initially granted the relayer role.
        @param initialRelayerThreshold Number of votes needed for a deposit proposal to be considered passed.
     */
    constructor (uint8 chainID, address[] memory initialRelayers, uint initialRelayerThreshold, uint256 fee, uint256 expiry) {
        _chainID = chainID;
        _relayerThreshold = initialRelayerThreshold;
        _fee = fee;
        _expiry = expiry;

        _setupRole(DEFAULT_ADMIN_ROLE, msg.sender);
        _setRoleAdmin(RELAYER_ROLE, DEFAULT_ADMIN_ROLE);

        for (uint i; i < initialRelayers.length; i++) {
            grantRole(RELAYER_ROLE, initialRelayers[i]);
            _totalRelayers++;
        }

    }

    /**
        @notice Returns true if {relayer} has the relayer role.
        @param relayer Address to check.
     */
    function isRelayer(address relayer) external view returns (bool) {
        return hasRole(RELAYER_ROLE, relayer);
    }

    /**
        @notice Removes admin role from {msg.sender} and grants it to {newAdmin}.
        @notice Only callable by an address that currently has the admin role.
        @param newAdmin Address that admin role will be granted to.
     */
    function renounceAdmin(address newAdmin) external onlyAdmin {
        grantRole(DEFAULT_ADMIN_ROLE, newAdmin);
        renounceRole(DEFAULT_ADMIN_ROLE, msg.sender);
    }

    /**
        @notice Pauses deposits, proposal creation and voting, and deposit executions.
        @notice Only callable by an address that currently has the admin role.
     */
    function adminPauseTransfers() external onlyAdmin {
        _pause();
    }

    /**
        @notice Unpauses deposits, proposal creation and voting, and deposit executions.
        @notice Only callable by an address that currently has the admin role.
     */
    function adminUnpauseTransfers() external onlyAdmin {
        _unpause();
    }

    /**
        @notice Modifies the number of votes required for a proposal to be considered passed.
        @notice Only callable by an address that currently has the admin role.
        @param newThreshold Value {_relayerThreshold} will be changed to.
        @notice Emits {RelayerThresholdChanged} event.
     */
    function adminChangeRelayerThreshold(uint newThreshold) external onlyAdmin {
        _relayerThreshold = newThreshold;
        emit RelayerThresholdChanged(newThreshold);
    }

    /**
        @notice Grants {relayerAddress} the relayer role and increases {_totalRelayer} count.
        @notice Only callable by an address that currently has the admin role.
        @param relayerAddress Address of relayer to be added.
        @notice Emits {RelayerAdded} event.
     */
    function adminAddRelayer(address relayerAddress) external onlyAdmin {
        require(!hasRole(RELAYER_ROLE, relayerAddress), "addr already has relayer role!");
        grantRole(RELAYER_ROLE, relayerAddress);
        emit RelayerAdded(relayerAddress);
        _totalRelayers++;
    }

    /**
        @notice Removes relayer role for {relayerAddress} and decreases {_totalRelayer} count.
        @notice Only callable by an address that currently has the admin role.
        @param relayerAddress Address of relayer to be removed.
        @notice Emits {RelayerRemoved} event.
     */
    function adminRemoveRelayer(address relayerAddress) external onlyAdmin {
        require(hasRole(RELAYER_ROLE, relayerAddress), "addr doesn't have relayer role!");
        revokeRole(RELAYER_ROLE, relayerAddress);
        emit RelayerRemoved(relayerAddress);
        _totalRelayers--;
    }

    /**
        @notice Sets a new resource for handler contracts that use the IERCHandler interface,
        and maps the {handlerAddress} to {resourceID} in {_resourceIDToHandlerAddress}.
        @notice Only callable by an address that currently has the admin role.
        @param handlerAddress Address of handler resource will be set for.
        @param resourceID ResourceID to be used when making deposits.
        @param tokenAddress Address of contract to be called when a deposit is made and a deposited is executed.
     */
    function adminSetResource(address handlerAddress, bytes32 resourceID, address tokenAddress) external onlyAdmin {
        _resourceIDToHandlerAddress[resourceID] = handlerAddress;
        IERCHandler handler = IERCHandler(handlerAddress);
        handler.setResource(resourceID, tokenAddress);
    }

    /**
        @notice Sets a new resource for handler contracts that use the IGenericHandler interface,
        and maps the {handlerAddress} to {resourceID} in {_resourceIDToHandlerAddress}.
        @notice Only callable by an address that currently has the admin role.
        @param handlerAddress Address of handler resource will be set for.
        @param resourceID ResourceID to be used when making deposits.
        @param contractAddress Address of contract to be called when a deposit is made and a deposited is executed.
     */
    function adminSetGenericResource(
        address handlerAddress,
        bytes32 resourceID,
        address contractAddress,
        bytes4 depositFunctionSig,
        bytes4 executeFunctionSig
    ) external onlyAdmin {
        _resourceIDToHandlerAddress[resourceID] = handlerAddress;
        IGenericHandler handler = IGenericHandler(handlerAddress);
        handler.setResource(resourceID, contractAddress, depositFunctionSig, executeFunctionSig);
    }

    /**
        @notice Sets a resource as burnable for handler contracts that use the IERCHandler interface.
        @notice Only callable by an address that currently has the admin role.
        @param handlerAddress Address of handler resource will be set for.
        @param tokenAddress Address of contract to be called when a deposit is made and a deposited is executed.
     */
    function adminSetBurnable(address handlerAddress, address tokenAddress) external onlyAdmin {
        IERCHandler handler = IERCHandler(handlerAddress);
        handler.setBurnable(tokenAddress);
    }

    /**
        @notice Returns a proposal.
        @param originChainID Chain ID deposit originated from.
        @param depositNonce ID of proposal generated by proposal's origin Bridge contract.
        @param dataHash Hash of data to be provided when deposit proposal is executed.
        @return Proposal which consists of:
        - _dataHash Hash of data to be provided when deposit proposal is executed.
        - _yesVotes Number of votes in favor of proposal.
        - _noVotes Number of votes against proposal.
        - _status Current status of proposal.
     */
    function getProposal(uint8 originChainID, uint64 depositNonce, bytes32 dataHash) external view returns (Proposal memory) {
        uint72 nonceAndID = (uint72(depositNonce) << 8) | uint72(originChainID);
        return _proposals[nonceAndID][dataHash];
    }

    /**
        @notice Changes deposit fee.
        @notice Only callable by admin.
        @param newFee Value {_fee} will be updated to.
     */
    function adminChangeFee(uint newFee) external onlyAdmin {
        require(_fee != newFee, "Current fee is equal to new fee");
        _fee = newFee;
    }

    /**
        @notice Used to manually withdraw funds from ERC safes.
        @param handlerAddress Address of handler to withdraw from.
        @param tokenAddress Address of token to withdraw.
        @param recipient Address to withdraw tokens to.
        @param amountOrTokenID Either the amount of ERC20 tokens or the ERC721 token ID to withdraw.
     */
    function adminWithdraw(
        address handlerAddress,
        address tokenAddress,
        address recipient,
        uint256 amountOrTokenID
    ) external onlyAdmin {
        IERCHandler handler = IERCHandler(handlerAddress);
        handler.withdraw(tokenAddress, recipient, amountOrTokenID);
    }

    /**
        @notice Initiates a transfer using a specified handler contract.
        @notice Only callable when Bridge is not paused.
        @param destinationChainID ID of chain deposit will be bridged to.
        @param resourceID ResourceID used to find address of handler to be used for deposit.
        @param data Additional data to be passed to specified handler.
        @notice Emits {Deposit} event.
     */
    function deposit(uint8 destinationChainID, bytes32 resourceID, bytes calldata data) external payable whenNotPaused {
        require(msg.value == _fee, "Incorrect fee supplied");

        address handler = _resourceIDToHandlerAddress[resourceID];
        require(handler != address(0), "resourceID not mapped to handler");

        uint64 depositNonce = ++_depositCounts[destinationChainID];
        _depositRecords[depositNonce][destinationChainID] = data;

        IDepositExecute depositHandler = IDepositExecute(handler);
        depositHandler.deposit(resourceID, destinationChainID, depositNonce, msg.sender, data);

        emit Deposit(destinationChainID, resourceID, depositNonce);
    }

    /**
        @notice When called, {msg.sender} will be marked as voting in favor of proposal.
        @notice Only callable by relayers when Bridge is not paused.
        @param chainID ID of chain deposit originated from.
        @param depositNonce ID of deposited generated by origin Bridge contract.
        @param dataHash Hash of data provided when deposit was made.
        @notice Proposal must not have already been passed or executed.
        @notice {msg.sender} must not have already voted on proposal.
        @notice Emits {ProposalEvent} event with status indicating the proposal status.
        @notice Emits {ProposalVote} event.
     */
    function voteProposal(uint8 chainID, uint64 depositNonce, bytes32 resourceID, bytes32 dataHash) external onlyRelayers whenNotPaused {

        uint72 nonceAndID = (uint72(depositNonce) << 8) | uint72(chainID);
        Proposal storage proposal = _proposals[nonceAndID][dataHash];

        require(_resourceIDToHandlerAddress[resourceID] != address(0), "no handler for resourceID");
        require(uint(proposal._status) <= 1, "proposal already passed/executed/cancelled");
        require(!_hasVotedOnProposal[nonceAndID][dataHash][msg.sender], "relayer already voted");

        if (uint(proposal._status) == 0) {
            ++_totalProposals;
            _proposals[nonceAndID][dataHash] = Proposal({
                _resourceID : resourceID,
                _dataHash : dataHash,
                _yesVotes : new address[](1),
                _noVotes : new address[](0),
                _status : ProposalStatus.Active,
                _proposedBlock : block.number
                });

            proposal._yesVotes[0] = msg.sender;
            emit ProposalEvent(chainID, depositNonce, ProposalStatus.Active, resourceID, dataHash);
        } else {
            if (sub(block.number, proposal._proposedBlock) > _expiry) {
                // if the number of blocks that has passed since this proposal was
                // submitted exceeds the expiry threshold set, cancel the proposal
                proposal._status = ProposalStatus.Cancelled;
                emit ProposalEvent(chainID, depositNonce, ProposalStatus.Cancelled, resourceID, dataHash);
            } else {
                require(dataHash == proposal._dataHash, "datahash mismatch");
                proposal._yesVotes.push(msg.sender);


            }

        }
        if (proposal._status != ProposalStatus.Cancelled) {
            _hasVotedOnProposal[nonceAndID][dataHash][msg.sender] = true;
            emit ProposalVote(chainID, depositNonce, proposal._status, resourceID);

            // If _depositThreshold is set to 1, then auto finalize
            // or if _relayerThreshold has been exceeded
            if (_relayerThreshold <= 1 || proposal._yesVotes.length >= _relayerThreshold) {
                proposal._status = ProposalStatus.Passed;

                emit ProposalEvent(chainID, depositNonce, ProposalStatus.Passed, resourceID, dataHash);
            }
        }

    }

    /**
        @notice Executes a deposit proposal that is considered passed using a specified handler contract.
        @notice Only callable by relayers when Bridge is not paused.
        @param chainID ID of chain deposit originated from.
        @param depositNonce ID of deposited generated by origin Bridge contract.
        @param dataHash Hash of data originally provided when deposit was made.
        @notice Proposal must be past expiry threshold.
        @notice Emits {ProposalEvent} event with status {Cancelled}.
     */
    function cancelProposal(uint8 chainID, uint64 depositNonce, bytes32 dataHash) public onlyAdminOrRelayer {
        uint72 nonceAndID = (uint72(depositNonce) << 8) | uint72(chainID);
        Proposal storage proposal = _proposals[nonceAndID][dataHash];

        require(proposal._status != ProposalStatus.Cancelled, "Proposal already cancelled");
        require(sub(block.number, proposal._proposedBlock) > _expiry, "Proposal not at expiry threshold");

        proposal._status = ProposalStatus.Cancelled;
        emit ProposalEvent(chainID, depositNonce, ProposalStatus.Cancelled, proposal._resourceID, proposal._dataHash);

    }

    /**
        @notice Executes a deposit proposal that is considered passed using a specified handler contract.
        @notice Only callable by relayers when Bridge is not paused.
        @param chainID ID of chain deposit originated from.
        @param resourceID ResourceID to be used when making deposits.
        @param depositNonce ID of deposited generated by origin Bridge contract.
        @param data Data originally provided when deposit was made.
        @notice Proposal must have Passed status.
        @notice Hash of {data} must equal proposal's {dataHash}.
        @notice Emits {ProposalEvent} event with status {Executed}.
     */
    function executeProposal(uint8 chainID, uint64 depositNonce, bytes calldata data, bytes32 resourceID) external onlyRelayers whenNotPaused {
        address handler = _resourceIDToHandlerAddress[resourceID];
        uint72 nonceAndID = (uint72(depositNonce) << 8) | uint72(chainID);
        bytes32 dataHash = keccak256(abi.encodePacked(handler, data));
        Proposal storage proposal = _proposals[nonceAndID][dataHash];

        require(proposal._status != ProposalStatus.Inactive, "proposal is not active");
        require(proposal._status == ProposalStatus.Passed, "proposal already transferred");
        require(dataHash == proposal._dataHash, "data doesn't match datahash");

        proposal._status = ProposalStatus.Executed;

        IDepositExecute depositHandler = IDepositExecute(_resourceIDToHandlerAddress[proposal._resourceID]);
        depositHandler.executeProposal(proposal._resourceID, data);

        emit ProposalEvent(chainID, depositNonce, proposal._status, proposal._resourceID, proposal._dataHash);
    }

    /**
        @notice Transfers eth in the contract to the specified addresses. The parameters addrs and amounts are mapped 1-1.
        This means that the address at index 0 for addrs will receive the amount (in WEI) from amounts at index 0.
        @param addrs Array of addresses to transfer {amounts} to.
        @param amounts Array of amonuts to transfer to {addrs}.
     */
    function transferFunds(address payable[] calldata addrs, uint[] calldata amounts) external onlyAdmin {
        for (uint i = 0; i < addrs.length; i++) {
            addrs[i].transfer(amounts[i]);
        }
    }

}

// SPDX-License-Identifier: GPL-3.0-only

pragma solidity 0.7.4;


/**
    @title Interface for Bridge contract.
    @author ChainSafe Systems.
 */
interface IBridge {
    /**
        @notice Exposing getter for {_chainID} instead of forcing the use of call.
        @return uint8 The {_chainID} that is currently set for the Bridge contract.
     */
    function _chainID() external returns (uint8);
}

// SPDX-License-Identifier: GPL-3.0-only

pragma solidity 0.7.4;

/**
    @title Interface for handler contracts that support deposits and deposit executions.
    @author ChainSafe Systems.
 */
interface IDepositExecute {
    /**
        @notice It is intended that deposit are made using the Bridge contract.
        @param destinationChainID Chain ID deposit is expected to be bridged to.
        @param depositNonce This value is generated as an ID by the Bridge contract.
        @param depositer Address of account making the deposit in the Bridge contract.
        @param data Consists of additional data needed for a specific deposit.
     */
    function deposit(bytes32 resourceID, uint8 destinationChainID, uint64 depositNonce, address depositer, bytes calldata data) external;

    /**
        @notice It is intended that proposals are executed by the Bridge contract.
        @param data Consists of additional data needed for a specific deposit execution.
     */
    function executeProposal(bytes32 resourceID, bytes calldata data) external;
}

// SPDX-License-Identifier: GPL-3.0-only

pragma solidity 0.7.4;


/**
    @title Interface to be used with handlers that support ERC20s and ERC721s.
    @author ChainSafe Systems.
 */
interface IERCHandler {
    /**
        @notice Correlates {resourceID} with {contractAddress}.
        @param resourceID ResourceID to be used when making deposits.
        @param contractAddress Address of contract to be called when a deposit is made and a deposited is executed.
     */
    function setResource(bytes32 resourceID, address contractAddress) external;
    /**
        @notice Marks {contractAddress} as mintable/burnable.
        @param contractAddress Address of contract to be used when making or executing deposits.
     */
    function setBurnable(address contractAddress) external;
    /**
        @notice Used to manually release funds from ERC safes.
        @param tokenAddress Address of token contract to release.
        @param recipient Address to release tokens to.
        @param amountOrTokenID Either the amount of ERC20 tokens or the ERC721 token ID to release.
     */
    function withdraw(address tokenAddress, address recipient, uint256 amountOrTokenID) external;
}

// SPDX-License-Identifier: GPL-3.0-only

pragma solidity 0.7.4;

/**
    @title Interface for handler that handles generic deposits and deposit executions.
    @author ChainSafe Systems.
 */
interface IGenericHandler {
    /**
        @notice Correlates {resourceID} with {contractAddress}, {depositFunctionSig}, and {executeFunctionSig}.
        @param resourceID ResourceID to be used when making deposits.
        @param contractAddress Address of contract to be called when a deposit is made and a deposited is executed.
        @param depositFunctionSig Function signature of method to be called in {contractAddress} when a deposit is made.
        @param executeFunctionSig Function signature of method to be called in {contractAddress} when a deposit is executed.
     */
    function setResource(bytes32 resourceID, address contractAddress, bytes4 depositFunctionSig, bytes4 executeFunctionSig) external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.4;

import "./Context.sol";

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it.
 */
abstract contract AccessControl is Context {
    struct RoleData {
        mapping (address => bool) members;
        bytes32 adminRole;
    }

    mapping (bytes32 => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, an admin role
     * bearer except when using {_setupRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view returns (bool) {
        return _roles[role].members[account];
    }

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) public view returns (bytes32) {
        return _roles[role].adminRole;
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) public virtual {
        require(hasRole(getRoleAdmin(role), _msgSender()), "AccessControl: sender must be an admin to grant");

        _grantRole(role, account);
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) public virtual {
        require(hasRole(getRoleAdmin(role), _msgSender()), "AccessControl: sender must be an admin to revoke");

        _revokeRole(role, account);
    }

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) public virtual {
        require(account == _msgSender(), "AccessControl: can only renounce roles for self");

        _revokeRole(role, account);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event. Note that unlike {grantRole}, this function doesn't perform any
     * checks on the calling account.
     *
     * [WARNING]
     * ====
     * This function should only be called from the constructor when setting
     * up the initial roles for the system.
     *
     * Using this function in any other way is effectively circumventing the admin
     * system imposed by {AccessControl}.
     * ====
     */
    function _setupRole(bytes32 role, address account) internal virtual {
        _grantRole(role, account);
    }

    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        emit RoleAdminChanged(role, getRoleAdmin(role), adminRole);
        _roles[role].adminRole = adminRole;
    }

    function _grantRole(bytes32 role, address account) private {
        if (!hasRole(role, account)) {
            _roles[role].members[account] = true;
            emit RoleGranted(role, account, _msgSender());
        }
    }

    function _revokeRole(bytes32 role, address account) private {
        if (hasRole(role, account)) {
            _roles[role].members[account] = false;
            emit RoleRevoked(role, account, _msgSender());
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.4;

/*
 * @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) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// SPDX-License-Identifier: GPL-3.0-only

pragma solidity 0.7.4;

import "./Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This is a stripped down version of Open zeppelin's Pausable contract.
 * https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/EnumerableSet.sol
 *
 */
contract Pausable {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor () {
        _paused = false;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view returns (bool) {
        return _paused;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _whenNotPaused();
        _;
    }

    function _whenNotPaused() private view {
        require(!_paused, "Pausable: paused");
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenPaused() {
        _whenPaused();
        _;
    }

    function _whenPaused() private view {
        require(_paused, "Pausable: not paused");
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(msg.sender);
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(msg.sender);
    }
}

// SPDX-License-Identifier: GPL-3.0-only

pragma solidity 0.7.4;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * note that this is a stripped down version of open zeppelin's safemath
 * https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/math/SafeMath.sol
 */

contract SafeMath {

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return _sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     */
    function _sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

}

{
  "remappings": [],
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"uint8","name":"chainID","type":"uint8"},{"internalType":"address[]","name":"initialRelayers","type":"address[]"},{"internalType":"uint256","name":"initialRelayerThreshold","type":"uint256"},{"internalType":"uint256","name":"fee","type":"uint256"},{"internalType":"uint256","name":"expiry","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint8","name":"destinationChainID","type":"uint8"},{"indexed":true,"internalType":"bytes32","name":"resourceID","type":"bytes32"},{"indexed":true,"internalType":"uint64","name":"depositNonce","type":"uint64"}],"name":"Deposit","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"Paused","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint8","name":"originChainID","type":"uint8"},{"indexed":true,"internalType":"uint64","name":"depositNonce","type":"uint64"},{"indexed":true,"internalType":"enum Bridge.ProposalStatus","name":"status","type":"uint8"},{"indexed":false,"internalType":"bytes32","name":"resourceID","type":"bytes32"},{"indexed":false,"internalType":"bytes32","name":"dataHash","type":"bytes32"}],"name":"ProposalEvent","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint8","name":"originChainID","type":"uint8"},{"indexed":true,"internalType":"uint64","name":"depositNonce","type":"uint64"},{"indexed":true,"internalType":"enum Bridge.ProposalStatus","name":"status","type":"uint8"},{"indexed":false,"internalType":"bytes32","name":"resourceID","type":"bytes32"}],"name":"ProposalVote","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"relayer","type":"address"}],"name":"RelayerAdded","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"relayer","type":"address"}],"name":"RelayerRemoved","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"newThreshold","type":"uint256"}],"name":"RelayerThresholdChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"role","type":"bytes32"},{"indexed":true,"internalType":"bytes32","name":"previousAdminRole","type":"bytes32"},{"indexed":true,"internalType":"bytes32","name":"newAdminRole","type":"bytes32"}],"name":"RoleAdminChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"role","type":"bytes32"},{"indexed":true,"internalType":"address","name":"account","type":"address"},{"indexed":true,"internalType":"address","name":"sender","type":"address"}],"name":"RoleGranted","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"role","type":"bytes32"},{"indexed":true,"internalType":"address","name":"account","type":"address"},{"indexed":true,"internalType":"address","name":"sender","type":"address"}],"name":"RoleRevoked","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"Unpaused","type":"event"},{"inputs":[],"name":"DEFAULT_ADMIN_ROLE","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"RELAYER_ROLE","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"_chainID","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint8","name":"","type":"uint8"}],"name":"_depositCounts","outputs":[{"internalType":"uint64","name":"","type":"uint64"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint64","name":"","type":"uint64"},{"internalType":"uint8","name":"","type":"uint8"}],"name":"_depositRecords","outputs":[{"internalType":"bytes","name":"","type":"bytes"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"_expiry","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"_fee","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint72","name":"","type":"uint72"},{"internalType":"bytes32","name":"","type":"bytes32"},{"internalType":"address","name":"","type":"address"}],"name":"_hasVotedOnProposal","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint72","name":"","type":"uint72"},{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"_proposals","outputs":[{"internalType":"bytes32","name":"_resourceID","type":"bytes32"},{"internalType":"bytes32","name":"_dataHash","type":"bytes32"},{"internalType":"enum Bridge.ProposalStatus","name":"_status","type":"uint8"},{"internalType":"uint256","name":"_proposedBlock","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"_relayerThreshold","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"_resourceIDToHandlerAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"_totalProposals","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"_totalRelayers","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"relayerAddress","type":"address"}],"name":"adminAddRelayer","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"newFee","type":"uint256"}],"name":"adminChangeFee","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"newThreshold","type":"uint256"}],"name":"adminChangeRelayerThreshold","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"adminPauseTransfers","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"relayerAddress","type":"address"}],"name":"adminRemoveRelayer","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"handlerAddress","type":"address"},{"internalType":"address","name":"tokenAddress","type":"address"}],"name":"adminSetBurnable","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"handlerAddress","type":"address"},{"internalType":"bytes32","name":"resourceID","type":"bytes32"},{"internalType":"address","name":"contractAddress","type":"address"},{"internalType":"bytes4","name":"depositFunctionSig","type":"bytes4"},{"internalType":"bytes4","name":"executeFunctionSig","type":"bytes4"}],"name":"adminSetGenericResource","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"handlerAddress","type":"address"},{"internalType":"bytes32","name":"resourceID","type":"bytes32"},{"internalType":"address","name":"tokenAddress","type":"address"}],"name":"adminSetResource","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"adminUnpauseTransfers","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"handlerAddress","type":"address"},{"internalType":"address","name":"tokenAddress","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amountOrTokenID","type":"uint256"}],"name":"adminWithdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint8","name":"chainID","type":"uint8"},{"internalType":"uint64","name":"depositNonce","type":"uint64"},{"internalType":"bytes32","name":"dataHash","type":"bytes32"}],"name":"cancelProposal","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint8","name":"destinationChainID","type":"uint8"},{"internalType":"bytes32","name":"resourceID","type":"bytes32"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"deposit","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint8","name":"chainID","type":"uint8"},{"internalType":"uint64","name":"depositNonce","type":"uint64"},{"internalType":"bytes","name":"data","type":"bytes"},{"internalType":"bytes32","name":"resourceID","type":"bytes32"}],"name":"executeProposal","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint8","name":"originChainID","type":"uint8"},{"internalType":"uint64","name":"depositNonce","type":"uint64"},{"internalType":"bytes32","name":"dataHash","type":"bytes32"}],"name":"getProposal","outputs":[{"components":[{"internalType":"bytes32","name":"_resourceID","type":"bytes32"},{"internalType":"bytes32","name":"_dataHash","type":"bytes32"},{"internalType":"address[]","name":"_yesVotes","type":"address[]"},{"internalType":"address[]","name":"_noVotes","type":"address[]"},{"internalType":"enum Bridge.ProposalStatus","name":"_status","type":"uint8"},{"internalType":"uint256","name":"_proposedBlock","type":"uint256"}],"internalType":"struct Bridge.Proposal","name":"","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"}],"name":"getRoleAdmin","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"grantRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"hasRole","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"relayer","type":"address"}],"name":"isRelayer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"paused","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newAdmin","type":"address"}],"name":"renounceAdmin","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"renounceRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"revokeRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address payable[]","name":"addrs","type":"address[]"},{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"name":"transferFunds","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint8","name":"chainID","type":"uint8"},{"internalType":"uint64","name":"depositNonce","type":"uint64"},{"internalType":"bytes32","name":"resourceID","type":"bytes32"},{"internalType":"bytes32","name":"dataHash","type":"bytes32"}],"name":"voteProposal","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000006400000000000000000000000000000000000000000000000000000000000000010000000000000000000000002e70f28c39c8d1f1b737cd37e1ec76b72bd87cf6

-----Decoded View---------------
Arg [0] : chainID (uint8): 0
Arg [1] : initialRelayers (address[]): 0x2E70f28C39c8d1f1b737cD37e1EC76b72bD87cf6
Arg [2] : initialRelayerThreshold (uint256): 1
Arg [3] : fee (uint256): 0
Arg [4] : expiry (uint256): 100

-----Encoded View---------------
7 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [1] : 00000000000000000000000000000000000000000000000000000000000000a0
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000001
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000064
Arg [5] : 0000000000000000000000000000000000000000000000000000000000000001
Arg [6] : 0000000000000000000000002e70f28c39c8d1f1b737cd37e1ec76b72bd87cf6