Contract

Contract Source Code (Solidity)

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Outline

• interface IStakingContractHandler
•    - function getStakeBalanceOf(address st ...
•    - function getTotalStakedTokens()
•    - function setNotifyDelegations(bool no ...
•    - function getNotifyDelegations()
• interface IStakeChangeNotifier
•    - function stakeChange(address _stakeOw ...
•    - function stakeChangeBatch(address[] c ...
•    - function stakeMigration(address _stak ...
• interface IERC20
•    - function totalSupply()
•    - function balanceOf(address account)
•    - function transfer(address recipient, ...
•    - function allowance(address owner, add ...
•    - function approve(address spender, uin ...
•    - function transferFrom(address sender, ...
• interface IMigratableStakingContract
•    - function getToken()
•    - function acceptMigration(address _sta ...
• interface IStakingContract
•    - function stake(uint256 _amount)
•    - function unstake(uint256 _amount)
•    - function withdraw()
•    - function restake()
•    - function distributeRewards(uint256 _t ...
•    - function getStakeBalanceOf(address _s ...
•    - function getTotalStakedTokens()
•    - function getUnstakeStatus(address _st ...
•    - function migrateStakedTokens(IMigrata ...
• interface IManagedContract /* is ILoc ...
•    - function refreshContracts()
• interface IContractRegistry
•    - function setContract(string calldata ...
•    - function getContract(string calldata ...
•    - function getManagedContracts()
•    - function lockContracts()
•    - function unlockContracts()
•    - function setManager(string calldata r ...
•    - function getManager(string calldata r ...
•    - function setNewContractRegistry(ICont ...
•    - function getPreviousContractRegistry( ...
• interface IContractRegistryAccessor
•    - function setContractRegistry(IContrac ...
•    - function getContractRegistry()
•    - function setRegistryAdmin(address _re ...
•    - function _msgSender()
•    - function _msgData()
•  contract WithClaimableRegistryMana ...
•    - function registryAdmin()
•    - function isRegistryAdmin()
•    - function renounceRegistryManagement()
•    - function _transferRegistryManagement( ...
•    - function transferRegistryManagement(a ...
•    - function claimRegistryManagement()
•    - function pendingRegistryAdmin()
•  contract Initializable
•    - function initializationAdmin()
•    - function initializationComplete()
•    - function isInitializationComplete()
•  contract ContractRegistryAccessor ...
•    - function isAdmin()
•    - function isManager(string memory role ...
•    - function isMigrationManager()
•    - function isFunctionalManager()
•    - function getProtocolContract()
•    - function getStakingRewardsContract()
•    - function getFeesAndBootstrapRewardsCo ...
•    - function getCommitteeContract()
•    - function getElectionsContract()
•    - function getDelegationsContract()
•    - function getGuardiansRegistrationCont ...
•    - function getCertificationContract()
•    - function getStakingContract()
•    - function getSubscriptionsContract()
•    - function getStakingRewardsWallet()
•    - function getBootstrapRewardsWallet()
•    - function getGeneralFeesWallet()
•    - function getCertifiedFeesWallet()
•    - function getStakingContractHandler()
•    - function setContractRegistry(IContrac ...
•    - function getContractRegistry()
•    - function setRegistryAdmin(address _re ...
• interface ILockable
•    - function lock()
•    - function unlock()
•    - function isLocked()
•  contract Lockable is ILockable, Co ...
•    - function lock()
•    - function unlock()
•    - function isLocked()
•  contract ManagedContract is IManag ...
•    - function refreshContracts()
•  contract StakingContractHandler is ... *
•    - function stakeChange(address stakeOwn ...
•    - function stakeChangeBatch(address[] c ...
•    - function stakeMigration(address stake ...
•    - function getStakeBalanceOf(address st ...
•    - function getTotalStakedTokens()
•    - function setNotifyDelegations(bool no ...
•    - function getNotifyDelegations()
•    - function refreshContracts()

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/**
 *Submitted for verification at Etherscan.io on 2020-11-04
*/

// File: contracts/spec_interfaces/IStakingContractHandler.sol

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

/// @title Staking contract handler contract interface in addition to IStakeChangeNotifier
interface IStakingContractHandler {
    event StakeChangeNotificationSkipped(address indexed stakeOwner);
    event StakeChangeBatchNotificationSkipped(address[] stakeOwners);
    event StakeMigrationNotificationSkipped(address indexed stakeOwner);

    /*
    * External functions
    */

    /// Returns the stake of the specified stake owner (excluding unstaked tokens).
    /// @param stakeOwner address The address to check.
    /// @return uint256 The total stake.
    function getStakeBalanceOf(address stakeOwner) external view returns (uint256);

    /// Returns the total amount staked tokens (excluding unstaked tokens).
    /// @return uint256 is the total staked tokens of all stake owners.
    function getTotalStakedTokens() external view returns (uint256);

    /*
    * Governance functions
    */

    event NotifyDelegationsChanged(bool notifyDelegations);

    /// Sets notifications to the delegation contract
    /// @dev staking while notifications are disabled may lead to a discrepancy in the delegation data  
    /// @dev governance function called only by the migration manager
    /// @param notifyDelegations is a bool indicating whether to notify the delegation contract
    function setNotifyDelegations(bool notifyDelegations) external; /* onlyMigrationManager */

    /// Returns the notifications to the delegation contract status
    /// @return notifyDelegations is a bool indicating whether notifications are enabled
    function getNotifyDelegations() external view returns (bool);
}

// File: contracts/IStakeChangeNotifier.sol

pragma solidity 0.6.12;

/// @title An interface for notifying of stake change events (e.g., stake, unstake, partial unstake, restate, etc.).
interface IStakeChangeNotifier {
    /// @dev Notifies of stake change event.
    /// @param _stakeOwner address The address of the subject stake owner.
    /// @param _amount uint256 The difference in the total staked amount.
    /// @param _sign bool The sign of the added (true) or subtracted (false) amount.
    /// @param _updatedStake uint256 The updated total staked amount.
    function stakeChange(address _stakeOwner, uint256 _amount, bool _sign, uint256 _updatedStake) external;

    /// @dev Notifies of multiple stake change events.
    /// @param _stakeOwners address[] The addresses of subject stake owners.
    /// @param _amounts uint256[] The differences in total staked amounts.
    /// @param _signs bool[] The signs of the added (true) or subtracted (false) amounts.
    /// @param _updatedStakes uint256[] The updated total staked amounts.
    function stakeChangeBatch(address[] calldata _stakeOwners, uint256[] calldata _amounts, bool[] calldata _signs,
        uint256[] calldata _updatedStakes) external;

    /// @dev Notifies of stake migration event.
    /// @param _stakeOwner address The address of the subject stake owner.
    /// @param _amount uint256 The migrated amount.
    function stakeMigration(address _stakeOwner, uint256 _amount) external;
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol

pragma solidity ^0.6.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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 `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, 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 `sender` to `recipient` 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 sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @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);
}

// File: contracts/IMigratableStakingContract.sol

pragma solidity 0.6.12;


/// @title An interface for staking contracts which support stake migration.
interface IMigratableStakingContract {
    /// @dev Returns the address of the underlying staked token.
    /// @return IERC20 The address of the token.
    function getToken() external view returns (IERC20);

    /// @dev Stakes ORBS tokens on behalf of msg.sender. This method assumes that the user has already approved at least
    /// the required amount using ERC20 approve.
    /// @param _stakeOwner address The specified stake owner.
    /// @param _amount uint256 The number of tokens to stake.
    function acceptMigration(address _stakeOwner, uint256 _amount) external;

    event AcceptedMigration(address indexed stakeOwner, uint256 amount, uint256 totalStakedAmount);
}

// File: contracts/IStakingContract.sol

pragma solidity 0.6.12;


/// @title An interface for staking contracts.
interface IStakingContract {
    /// @dev Stakes ORBS tokens on behalf of msg.sender. This method assumes that the user has already approved at least
    /// the required amount using ERC20 approve.
    /// @param _amount uint256 The amount of tokens to stake.
    function stake(uint256 _amount) external;

    /// @dev Unstakes ORBS tokens from msg.sender. If successful, this will start the cooldown period, after which
    /// msg.sender would be able to withdraw all of his tokens.
    /// @param _amount uint256 The amount of tokens to unstake.
    function unstake(uint256 _amount) external;

    /// @dev Requests to withdraw all of staked ORBS tokens back to msg.sender. Stake owners can withdraw their ORBS
    /// tokens only after previously unstaking them and after the cooldown period has passed (unless the contract was
    /// requested to release all stakes).
    function withdraw() external;

    /// @dev Restakes unstaked ORBS tokens (in or after cooldown) for msg.sender.
    function restake() external;

    /// @dev Distributes staking rewards to a list of addresses by directly adding rewards to their stakes. This method
    /// assumes that the user has already approved at least the required amount using ERC20 approve. Since this is a
    /// convenience method, we aren't concerned about reaching block gas limit by using large lists. We assume that
    /// callers will be able to properly batch/paginate their requests.
    /// @param _totalAmount uint256 The total amount of rewards to distribute.
    /// @param _stakeOwners address[] The addresses of the stake owners.
    /// @param _amounts uint256[] The amounts of the rewards.
    function distributeRewards(uint256 _totalAmount, address[] calldata _stakeOwners, uint256[] calldata _amounts) external;

    /// @dev Returns the stake of the specified stake owner (excluding unstaked tokens).
    /// @param _stakeOwner address The address to check.
    /// @return uint256 The total stake.
    function getStakeBalanceOf(address _stakeOwner) external view returns (uint256);

    /// @dev Returns the total amount staked tokens (excluding unstaked tokens).
    /// @return uint256 The total staked tokens of all stake owners.
    function getTotalStakedTokens() external view returns (uint256);

    /// @dev Returns the time that the cooldown period ends (or ended) and the amount of tokens to be released.
    /// @param _stakeOwner address The address to check.
    /// @return cooldownAmount uint256 The total tokens in cooldown.
    /// @return cooldownEndTime uint256 The time when the cooldown period ends (in seconds).
    function getUnstakeStatus(address _stakeOwner) external view returns (uint256 cooldownAmount,
        uint256 cooldownEndTime);

    /// @dev Migrates the stake of msg.sender from this staking contract to a new approved staking contract.
    /// @param _newStakingContract IMigratableStakingContract The new staking contract which supports stake migration.
    /// @param _amount uint256 The amount of tokens to migrate.
    function migrateStakedTokens(IMigratableStakingContract _newStakingContract, uint256 _amount) external;

    event Staked(address indexed stakeOwner, uint256 amount, uint256 totalStakedAmount);
    event Unstaked(address indexed stakeOwner, uint256 amount, uint256 totalStakedAmount);
    event Withdrew(address indexed stakeOwner, uint256 amount, uint256 totalStakedAmount);
    event Restaked(address indexed stakeOwner, uint256 amount, uint256 totalStakedAmount);
    event MigratedStake(address indexed stakeOwner, uint256 amount, uint256 totalStakedAmount);
}

// File: contracts/spec_interfaces/IManagedContract.sol

pragma solidity 0.6.12;

/// @title managed contract interface, used by the contracts registry to notify the contract on updates
interface IManagedContract /* is ILockable, IContractRegistryAccessor, Initializable */ {

    /// Refreshes the address of the other contracts the contract interacts with
    /// @dev called by the registry contract upon an update of a contract in the registry
    function refreshContracts() external;

}

// File: contracts/spec_interfaces/IContractRegistry.sol

pragma solidity 0.6.12;

/// @title Contract registry contract interface
/// @dev The contract registry holds Orbs PoS contracts and managers lists
/// @dev The contract registry updates the managed contracts on changes in the contract list
/// @dev Governance functions restricted to managers access the registry to retrieve the manager address 
/// @dev The contract registry represents the source of truth for Orbs Ethereum contracts 
/// @dev By tracking the registry events or query before interaction, one can access the up to date contracts 
interface IContractRegistry {

	event ContractAddressUpdated(string contractName, address addr, bool managedContract);
	event ManagerChanged(string role, address newManager);
	event ContractRegistryUpdated(address newContractRegistry);

	/*
	* External functions
	*/

    /// Updates the contracts address and emits a corresponding event
    /// @dev governance function called only by the migrationManager or registryAdmin
    /// @param contractName is the contract name, used to identify it
    /// @param addr is the contract updated address
    /// @param managedContract indicates whether the contract is managed by the registry and notified on changes
	function setContract(string calldata contractName, address addr, bool managedContract) external /* onlyAdminOrMigrationManager */;

    /// Returns the current address of the given contracts
    /// @param contractName is the contract name, used to identify it
    /// @return addr is the contract updated address
	function getContract(string calldata contractName) external view returns (address);

    /// Returns the list of contract addresses managed by the registry
    /// @dev Managed contracts are updated on changes in the registry contracts addresses 
    /// @return addrs is the list of managed contracts
	function getManagedContracts() external view returns (address[] memory);

    /// Locks all the managed contracts 
    /// @dev governance function called only by the migrationManager or registryAdmin
    /// @dev When set all onlyWhenActive functions will revert
	function lockContracts() external /* onlyAdminOrMigrationManager */;

    /// Unlocks all the managed contracts 
    /// @dev governance function called only by the migrationManager or registryAdmin
	function unlockContracts() external /* onlyAdminOrMigrationManager */;
	
    /// Updates a manager address and emits a corresponding event
    /// @dev governance function called only by the registryAdmin
    /// @dev the managers list is a flexible list of role to the manager's address
    /// @param role is the managers' role name, for example "functionalManager"
    /// @param manager is the manager updated address
	function setManager(string calldata role, address manager) external /* onlyAdmin */;

    /// Returns the current address of the given manager
    /// @param role is the manager name, used to identify it
    /// @return addr is the manager updated address
	function getManager(string calldata role) external view returns (address);

    /// Sets a new contract registry to migrate to
    /// @dev governance function called only by the registryAdmin
    /// @dev updates the registry address record in all the managed contracts
    /// @dev by tracking the emitted ContractRegistryUpdated, tools can track the up to date contracts
    /// @param newRegistry is the new registry contract 
	function setNewContractRegistry(IContractRegistry newRegistry) external /* onlyAdmin */;

    /// Returns the previous contract registry address 
    /// @dev used when the setting the contract as a new registry to assure a valid registry
    /// @return previousContractRegistry is the previous contract registry
	function getPreviousContractRegistry() external view returns (address);
}

// File: contracts/spec_interfaces/IContractRegistryAccessor.sol

pragma solidity 0.6.12;


interface IContractRegistryAccessor {

    /// Sets the contract registry address
    /// @dev governance function called only by an admin
    /// @param newRegistry is the new registry contract 
    function setContractRegistry(IContractRegistry newRegistry) external /* onlyAdmin */;

    /// Returns the contract registry address
    /// @return contractRegistry is the contract registry address
    function getContractRegistry() external view returns (IContractRegistry contractRegistry);

    function setRegistryAdmin(address _registryAdmin) external /* onlyInitializationAdmin */;

}

// File: @openzeppelin/contracts/GSN/Context.sol

pragma solidity ^0.6.0;

/*
 * @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 GSN 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 payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// File: contracts/WithClaimableRegistryManagement.sol

pragma solidity 0.6.12;


/**
 * @title Claimable
 * @dev Extension for the Ownable contract, where the ownership needs to be claimed.
 * This allows the new owner to accept the transfer.
 */
contract WithClaimableRegistryManagement is Context {
    address private _registryAdmin;
    address private _pendingRegistryAdmin;

    event RegistryManagementTransferred(address indexed previousRegistryAdmin, address indexed newRegistryAdmin);

    /**
     * @dev Initializes the contract setting the deployer as the initial registryRegistryAdmin.
     */
    constructor () internal {
        address msgSender = _msgSender();
        _registryAdmin = msgSender;
        emit RegistryManagementTransferred(address(0), msgSender);
    }

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

    /**
     * @dev Throws if called by any account other than the registryAdmin.
     */
    modifier onlyRegistryAdmin() {
        require(isRegistryAdmin(), "WithClaimableRegistryManagement: caller is not the registryAdmin");
        _;
    }

    /**
     * @dev Returns true if the caller is the current registryAdmin.
     */
    function isRegistryAdmin() public view returns (bool) {
        return _msgSender() == _registryAdmin;
    }

    /**
     * @dev Leaves the contract without registryAdmin. It will not be possible to call
     * `onlyManager` functions anymore. Can only be called by the current registryAdmin.
     *
     * NOTE: Renouncing registryManagement will leave the contract without an registryAdmin,
     * thereby removing any functionality that is only available to the registryAdmin.
     */
    function renounceRegistryManagement() public onlyRegistryAdmin {
        emit RegistryManagementTransferred(_registryAdmin, address(0));
        _registryAdmin = address(0);
    }

    /**
     * @dev Transfers registryManagement of the contract to a new account (`newManager`).
     */
    function _transferRegistryManagement(address newRegistryAdmin) internal {
        require(newRegistryAdmin != address(0), "RegistryAdmin: new registryAdmin is the zero address");
        emit RegistryManagementTransferred(_registryAdmin, newRegistryAdmin);
        _registryAdmin = newRegistryAdmin;
    }

    /**
     * @dev Modifier throws if called by any account other than the pendingManager.
     */
    modifier onlyPendingRegistryAdmin() {
        require(msg.sender == _pendingRegistryAdmin, "Caller is not the pending registryAdmin");
        _;
    }
    /**
     * @dev Allows the current registryAdmin to set the pendingManager address.
     * @param newRegistryAdmin The address to transfer registryManagement to.
     */
    function transferRegistryManagement(address newRegistryAdmin) public onlyRegistryAdmin {
        _pendingRegistryAdmin = newRegistryAdmin;
    }

    /**
     * @dev Allows the _pendingRegistryAdmin address to finalize the transfer.
     */
    function claimRegistryManagement() external onlyPendingRegistryAdmin {
        _transferRegistryManagement(_pendingRegistryAdmin);
        _pendingRegistryAdmin = address(0);
    }

    /**
     * @dev Returns the current pendingRegistryAdmin
    */
    function pendingRegistryAdmin() public view returns (address) {
       return _pendingRegistryAdmin;  
    }
}

// File: contracts/Initializable.sol

pragma solidity 0.6.12;

contract Initializable {

    address private _initializationAdmin;

    event InitializationComplete();

    /// Constructor
    /// Sets the initializationAdmin to the contract deployer
    /// The initialization admin may call any manager only function until initializationComplete
    constructor() public{
        _initializationAdmin = msg.sender;
    }

    modifier onlyInitializationAdmin() {
        require(msg.sender == initializationAdmin(), "sender is not the initialization admin");

        _;
    }

    /*
    * External functions
    */

    /// Returns the initializationAdmin address
    function initializationAdmin() public view returns (address) {
        return _initializationAdmin;
    }

    /// Finalizes the initialization and revokes the initializationAdmin role 
    function initializationComplete() external onlyInitializationAdmin {
        _initializationAdmin = address(0);
        emit InitializationComplete();
    }

    /// Checks if the initialization was completed
    function isInitializationComplete() public view returns (bool) {
        return _initializationAdmin == address(0);
    }

}

// File: contracts/ContractRegistryAccessor.sol

pragma solidity 0.6.12;





contract ContractRegistryAccessor is IContractRegistryAccessor, WithClaimableRegistryManagement, Initializable {

    IContractRegistry private contractRegistry;

    /// Constructor
    /// @param _contractRegistry is the contract registry address
    /// @param _registryAdmin is the registry admin address
    constructor(IContractRegistry _contractRegistry, address _registryAdmin) public {
        require(address(_contractRegistry) != address(0), "_contractRegistry cannot be 0");
        setContractRegistry(_contractRegistry);
        _transferRegistryManagement(_registryAdmin);
    }

    modifier onlyAdmin {
        require(isAdmin(), "sender is not an admin (registryManger or initializationAdmin)");

        _;
    }

    modifier onlyMigrationManager {
        require(isMigrationManager(), "sender is not the migration manager");

        _;
    }

    modifier onlyFunctionalManager {
        require(isFunctionalManager(), "sender is not the functional manager");

        _;
    }

    /// Checks whether the caller is Admin: either the contract registry, the registry admin, or the initialization admin
    function isAdmin() internal view returns (bool) {
        return msg.sender == address(contractRegistry) || msg.sender == registryAdmin() || msg.sender == initializationAdmin();
    }

    /// Checks whether the caller is a specific manager role or and Admin
    /// @dev queries the registry contract for the up to date manager assignment
    function isManager(string memory role) internal view returns (bool) {
        IContractRegistry _contractRegistry = contractRegistry;
        return isAdmin() || _contractRegistry != IContractRegistry(0) && contractRegistry.getManager(role) == msg.sender;
    }

    /// Checks whether the caller is the migration manager
    function isMigrationManager() internal view returns (bool) {
        return isManager('migrationManager');
    }

    /// Checks whether the caller is the functional manager
    function isFunctionalManager() internal view returns (bool) {
        return isManager('functionalManager');
    }

    /* 
     * Contract getters, return the address of a contract by calling the contract registry 
     */ 

    function getProtocolContract() internal view returns (address) {
        return contractRegistry.getContract("protocol");
    }

    function getStakingRewardsContract() internal view returns (address) {
        return contractRegistry.getContract("stakingRewards");
    }

    function getFeesAndBootstrapRewardsContract() internal view returns (address) {
        return contractRegistry.getContract("feesAndBootstrapRewards");
    }

    function getCommitteeContract() internal view returns (address) {
        return contractRegistry.getContract("committee");
    }

    function getElectionsContract() internal view returns (address) {
        return contractRegistry.getContract("elections");
    }

    function getDelegationsContract() internal view returns (address) {
        return contractRegistry.getContract("delegations");
    }

    function getGuardiansRegistrationContract() internal view returns (address) {
        return contractRegistry.getContract("guardiansRegistration");
    }

    function getCertificationContract() internal view returns (address) {
        return contractRegistry.getContract("certification");
    }

    function getStakingContract() internal view returns (address) {
        return contractRegistry.getContract("staking");
    }

    function getSubscriptionsContract() internal view returns (address) {
        return contractRegistry.getContract("subscriptions");
    }

    function getStakingRewardsWallet() internal view returns (address) {
        return contractRegistry.getContract("stakingRewardsWallet");
    }

    function getBootstrapRewardsWallet() internal view returns (address) {
        return contractRegistry.getContract("bootstrapRewardsWallet");
    }

    function getGeneralFeesWallet() internal view returns (address) {
        return contractRegistry.getContract("generalFeesWallet");
    }

    function getCertifiedFeesWallet() internal view returns (address) {
        return contractRegistry.getContract("certifiedFeesWallet");
    }

    function getStakingContractHandler() internal view returns (address) {
        return contractRegistry.getContract("stakingContractHandler");
    }

    /*
    * Governance functions
    */

    event ContractRegistryAddressUpdated(address addr);

    /// Sets the contract registry address
    /// @dev governance function called only by an admin
    /// @param newContractRegistry is the new registry contract 
    function setContractRegistry(IContractRegistry newContractRegistry) public override onlyAdmin {
        require(newContractRegistry.getPreviousContractRegistry() == address(contractRegistry), "new contract registry must provide the previous contract registry");
        contractRegistry = newContractRegistry;
        emit ContractRegistryAddressUpdated(address(newContractRegistry));
    }

    /// Returns the contract registry that the contract is set to use
    /// @return contractRegistry is the registry contract address
    function getContractRegistry() public override view returns (IContractRegistry) {
        return contractRegistry;
    }

    function setRegistryAdmin(address _registryAdmin) external override onlyInitializationAdmin {
        _transferRegistryManagement(_registryAdmin);
    }

}

// File: contracts/spec_interfaces/ILockable.sol

pragma solidity 0.6.12;

/// @title lockable contract interface, allows to lock a contract
interface ILockable {

    event Locked();
    event Unlocked();

    /// Locks the contract to external non-governance function calls
    /// @dev governance function called only by the migration manager or an admin
    /// @dev typically called by the registry contract upon locking all managed contracts
    /// @dev getters and migration functions remain active also for locked contracts
    /// @dev checked by the onlyWhenActive modifier
    function lock() external /* onlyMigrationManager */;

    /// Unlocks the contract 
    /// @dev governance function called only by the migration manager or an admin
    /// @dev typically called by the registry contract upon unlocking all managed contracts
    function unlock() external /* onlyMigrationManager */;

    /// Returns the contract locking status
    /// @return isLocked is a bool indicating the contract is locked 
    function isLocked() view external returns (bool);

}

// File: contracts/Lockable.sol

pragma solidity 0.6.12;



/// @title lockable contract
contract Lockable is ILockable, ContractRegistryAccessor {

    bool public locked;

    /// Constructor
    /// @param _contractRegistry is the contract registry address
    /// @param _registryAdmin is the registry admin address
    constructor(IContractRegistry _contractRegistry, address _registryAdmin) ContractRegistryAccessor(_contractRegistry, _registryAdmin) public {}

    /// Locks the contract to external non-governance function calls
    /// @dev governance function called only by the migration manager or an admin
    /// @dev typically called by the registry contract upon locking all managed contracts
    /// @dev getters and migration functions remain active also for locked contracts
    /// @dev checked by the onlyWhenActive modifier
    function lock() external override onlyMigrationManager {
        locked = true;
        emit Locked();
    }

    /// Unlocks the contract 
    /// @dev governance function called only by the migration manager or an admin
    /// @dev typically called by the registry contract upon unlocking all managed contracts
    function unlock() external override onlyMigrationManager {
        locked = false;
        emit Unlocked();
    }

    /// Returns the contract locking status
    /// @return isLocked is a bool indicating the contract is locked 
    function isLocked() external override view returns (bool) {
        return locked;
    }

    modifier onlyWhenActive() {
        require(!locked, "contract is locked for this operation");

        _;
    }
}

// File: contracts/ManagedContract.sol

pragma solidity 0.6.12;



/// @title managed contract
contract ManagedContract is IManagedContract, Lockable {

    /// @param _contractRegistry is the contract registry address
    /// @param _registryAdmin is the registry admin address
    constructor(IContractRegistry _contractRegistry, address _registryAdmin) Lockable(_contractRegistry, _registryAdmin) public {}

    /// Refreshes the address of the other contracts the contract interacts with
    /// @dev called by the registry contract upon an update of a contract in the registry
    function refreshContracts() virtual override external {}

}

// File: contracts/StakingContractHandler.sol

pragma solidity 0.6.12;





/// @title Staking contract handler
/// @dev instantiated between the staking contract and delegation contract
/// @dev handles migration and governance for the staking contract notification
contract StakingContractHandler is IStakingContractHandler, IStakeChangeNotifier, ManagedContract {

    IStakingContract stakingContract;
    struct Settings {
        IStakeChangeNotifier delegationsContract;
        bool notifyDelegations;
    }
    Settings settings;

    /// @param _contractRegistry is the contract registry address
    /// @param _registryAdmin is the registry admin address
    constructor(IContractRegistry _contractRegistry, address _registryAdmin) public ManagedContract(_contractRegistry, _registryAdmin) {
        settings.notifyDelegations = true;
    }

    modifier onlyStakingContract() {
        require(msg.sender == address(stakingContract), "caller is not the staking contract");

        _;
    }

    /*
    * External functions
    */

    /// @dev Notifies of stake change event.
    /// @dev IStakeChangeNotifier interface function.
    /// @param stakeOwner address The address of the subject stake owner.
    /// @param amount uint256 The difference in the total staked amount.
    /// @param sign bool The sign of the added (true) or subtracted (false) amount.
    /// @param updatedStake uint256 The updated total staked amount.
    function stakeChange(address stakeOwner, uint256 amount, bool sign, uint256 updatedStake) external override onlyStakingContract {
        Settings memory _settings = settings;
        if (!_settings.notifyDelegations) {
            emit StakeChangeNotificationSkipped(stakeOwner);
            return;
        }

        _settings.delegationsContract.stakeChange(stakeOwner, amount, sign, updatedStake);
    }

    /// @dev Notifies of multiple stake change events.
    /// @dev IStakeChangeNotifier interface function.
    /// @param stakeOwners address[] The addresses of subject stake owners.
    /// @param amounts uint256[] The differences in total staked amounts.
    /// @param signs bool[] The signs of the added (true) or subtracted (false) amounts.
    /// @param updatedStakes uint256[] The updated total staked amounts.
    function stakeChangeBatch(address[] calldata stakeOwners, uint256[] calldata amounts, bool[] calldata signs, uint256[] calldata updatedStakes) external override onlyStakingContract {
        Settings memory _settings = settings;
        if (!_settings.notifyDelegations) {
            emit StakeChangeBatchNotificationSkipped(stakeOwners);
            return;
        }

        _settings.delegationsContract.stakeChangeBatch(stakeOwners, amounts, signs, updatedStakes);
    }

    /// @dev Notifies of stake migration event.
    /// @dev IStakeChangeNotifier interface function.
    /// @param stakeOwner address The address of the subject stake owner.
    /// @param amount uint256 The migrated amount.
    function stakeMigration(address stakeOwner, uint256 amount) external override onlyStakingContract {
        Settings memory _settings = settings;
        if (!_settings.notifyDelegations) {
            emit StakeMigrationNotificationSkipped(stakeOwner);
            return;
        }

        _settings.delegationsContract.stakeMigration(stakeOwner, amount);
    }

    /// Returns the stake of the specified stake owner (excluding unstaked tokens).
    /// @param stakeOwner address The address to check.
    /// @return uint256 The total stake.
    function getStakeBalanceOf(address stakeOwner) external override view returns (uint256) {
        return stakingContract.getStakeBalanceOf(stakeOwner);
    }

    /// Returns the total amount staked tokens (excluding unstaked tokens).
    /// @return uint256 is the total staked tokens of all stake owners.
    function getTotalStakedTokens() external override view returns (uint256) {
        return stakingContract.getTotalStakedTokens();
    }

    /*
    * Governance functions
    */

    /// Sets notifications to the delegation contract
    /// @dev staking while notifications are disabled may lead to a discrepancy in the delegation data
    /// @dev governance function called only by the migration manager
    /// @param notifyDelegations is a bool indicating whether to notify the delegation contract
    function setNotifyDelegations(bool notifyDelegations) external override onlyMigrationManager {
        settings.notifyDelegations = notifyDelegations;
        emit NotifyDelegationsChanged(notifyDelegations);
    }

    /// Returns the notifications to the delegation contract status
    /// @return notifyDelegations is a bool indicating whether notifications are enabled
    function getNotifyDelegations() external view override returns (bool) {
        return settings.notifyDelegations;
    }

    /*
     * Contracts topology / registry interface
     */

    /// Refreshes the address of the other contracts the contract interacts with
    /// @dev called by the registry contract upon an update of a contract in the registry
    function refreshContracts() external override {
        settings.delegationsContract = IStakeChangeNotifier(getDelegationsContract());
        stakingContract = IStakingContract(getStakingContract());
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

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IContractRegistry","name":"_contractRegistry","type":"address"},{"internalType":"address","name":"_registryAdmin","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"addr","type":"address"}],"name":"ContractRegistryAddressUpdated","type":"event"},{"anonymous":false,"inputs":[],"name":"InitializationComplete","type":"event"},{"anonymous":false,"inputs":[],"name":"Locked","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bool","name":"notifyDelegations","type":"bool"}],"name":"NotifyDelegationsChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousRegistryAdmin","type":"address"},{"indexed":true,"internalType":"address","name":"newRegistryAdmin","type":"address"}],"name":"RegistryManagementTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address[]","name":"stakeOwners","type":"address[]"}],"name":"StakeChangeBatchNotificationSkipped","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"stakeOwner","type":"address"}],"name":"StakeChangeNotificationSkipped","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"stakeOwner","type":"address"}],"name":"StakeMigrationNotificationSkipped","type":"event"},{"anonymous":false,"inputs":[],"name":"Unlocked","type":"event"},{"inputs":[],"name":"claimRegistryManagement","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"getContractRegistry","outputs":[{"internalType":"contract IContractRegistry","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getNotifyDelegations","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"stakeOwner","type":"address"}],"name":"getStakeBalanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getTotalStakedTokens","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"initializationAdmin","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"initializationComplete","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"isInitializationComplete","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"isLocked","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"isRegistryAdmin","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"lock","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"locked","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pendingRegistryAdmin","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"refreshContracts","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"registryAdmin","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceRegistryManagement","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract IContractRegistry","name":"newContractRegistry","type":"address"}],"name":"setContractRegistry","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bool","name":"notifyDelegations","type":"bool"}],"name":"setNotifyDelegations","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_registryAdmin","type":"address"}],"name":"setRegistryAdmin","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"stakeOwner","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bool","name":"sign","type":"bool"},{"internalType":"uint256","name":"updatedStake","type":"uint256"}],"name":"stakeChange","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address[]","name":"stakeOwners","type":"address[]"},{"internalType":"uint256[]","name":"amounts","type":"uint256[]"},{"internalType":"bool[]","name":"signs","type":"bool[]"},{"internalType":"uint256[]","name":"updatedStakes","type":"uint256[]"}],"name":"stakeChangeBatch","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"stakeOwner","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"stakeMigration","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newRegistryAdmin","type":"address"}],"name":"transferRegistryManagement","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"unlock","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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000000000000000000000000d859701c81119ab12a1e62af6270ad2ae05c7ab3000000000000000000000000f1fd5233e60e7ef797025fe9dd066d60d59bcb92

-----Decoded View---------------
Arg [0] : _contractRegistry (address): 0xD859701C81119aB12A1e62AF6270aD2AE05c7AB3
Arg [1] : _registryAdmin (address): 0xf1fD5233E60E7Ef797025FE9DD066d60d59BcB92

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000d859701c81119ab12a1e62af6270ad2ae05c7ab3
Arg [1] : 000000000000000000000000f1fd5233e60e7ef797025fe9dd066d60d59bcb92

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