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pragma solidity ^0.5.16;

import "./XVSVaultStorage.sol";
import "./XVSVaultErrorReporter.sol";

/**
 * @title XVS Vault Proxy
 * @author Venus
 * @notice XVS Vault Proxy contract
 */
contract XVSVaultProxy is XVSVaultAdminStorage, XVSVaultErrorReporter {
    /**
     * @notice Emitted when pendingXVSVaultImplementation is changed
     */
    event NewPendingImplementation(address oldPendingImplementation, address newPendingImplementation);

    /**
     * @notice Emitted when pendingXVSVaultImplementation is accepted, which means XVS Vault implementation is updated
     */
    event NewImplementation(address oldImplementation, address newImplementation);

    /**
     * @notice Emitted when pendingAdmin is changed
     */
    event NewPendingAdmin(address oldPendingAdmin, address newPendingAdmin);

    /**
     * @notice Emitted when pendingAdmin is accepted, which means admin is updated
     */
    event NewAdmin(address oldAdmin, address newAdmin);

    constructor() public {
        // Set admin to caller
        admin = msg.sender;
    }

    /*** Admin Functions ***/
    function _setPendingImplementation(address newPendingImplementation) public returns (uint) {
        if (msg.sender != admin) {
            return fail(Error.UNAUTHORIZED, FailureInfo.SET_PENDING_IMPLEMENTATION_OWNER_CHECK);
        }

        address oldPendingImplementation = pendingXVSVaultImplementation;

        pendingXVSVaultImplementation = newPendingImplementation;

        emit NewPendingImplementation(oldPendingImplementation, pendingXVSVaultImplementation);

        return uint(Error.NO_ERROR);
    }

    /**
     * @notice Accepts new implementation of XVS Vault. msg.sender must be pendingImplementation
     * @dev Admin function for new implementation to accept it's role as implementation
     * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
     */
    function _acceptImplementation() public returns (uint) {
        // Check caller is pendingImplementation
        if (msg.sender != pendingXVSVaultImplementation) {
            return fail(Error.UNAUTHORIZED, FailureInfo.ACCEPT_PENDING_IMPLEMENTATION_ADDRESS_CHECK);
        }

        // Save current values for inclusion in log
        address oldImplementation = implementation;
        address oldPendingImplementation = pendingXVSVaultImplementation;

        implementation = pendingXVSVaultImplementation;

        pendingXVSVaultImplementation = address(0);

        emit NewImplementation(oldImplementation, implementation);
        emit NewPendingImplementation(oldPendingImplementation, pendingXVSVaultImplementation);

        return uint(Error.NO_ERROR);
    }

    /**
     * @notice Begins transfer of admin rights. The newPendingAdmin must call `_acceptAdmin` to finalize the transfer.
     * @dev Admin function to begin change of admin. The newPendingAdmin must call `_acceptAdmin` to finalize the transfer.
     * @param newPendingAdmin New pending admin.
     * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
     */
    function _setPendingAdmin(address newPendingAdmin) public returns (uint) {
        // Check caller = admin
        if (msg.sender != admin) {
            return fail(Error.UNAUTHORIZED, FailureInfo.SET_PENDING_ADMIN_OWNER_CHECK);
        }

        // Save current value, if any, for inclusion in log
        address oldPendingAdmin = pendingAdmin;

        // Store pendingAdmin with value newPendingAdmin
        pendingAdmin = newPendingAdmin;

        // Emit NewPendingAdmin(oldPendingAdmin, newPendingAdmin)
        emit NewPendingAdmin(oldPendingAdmin, newPendingAdmin);

        return uint(Error.NO_ERROR);
    }

    /**
     * @notice Accepts transfer of admin rights. msg.sender must be pendingAdmin
     * @dev Admin function for pending admin to accept role and update admin
     * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details)
     */
    function _acceptAdmin() public returns (uint) {
        // Check caller is pendingAdmin
        if (msg.sender != pendingAdmin) {
            return fail(Error.UNAUTHORIZED, FailureInfo.ACCEPT_ADMIN_PENDING_ADMIN_CHECK);
        }

        // Save current values for inclusion in log
        address oldAdmin = admin;
        address oldPendingAdmin = pendingAdmin;

        // Store admin with value pendingAdmin
        admin = pendingAdmin;

        // Clear the pending value
        pendingAdmin = address(0);

        emit NewAdmin(oldAdmin, admin);
        emit NewPendingAdmin(oldPendingAdmin, pendingAdmin);

        return uint(Error.NO_ERROR);
    }

    /**
     * @dev Delegates execution to an implementation contract.
     * It returns to the external caller whatever the implementation returns
     * or forwards reverts.
     */
    function() external payable {
        // delegate all other functions to current implementation
        (bool success, ) = implementation.delegatecall(msg.data);

        assembly {
            let free_mem_ptr := mload(0x40)
            returndatacopy(free_mem_ptr, 0, returndatasize)

            switch success
            case 0 {
                revert(free_mem_ptr, returndatasize)
            }
            default {
                return(free_mem_ptr, returndatasize)
            }
        }
    }
}

// SPDX-License-Identifier: BSD-3-Clause
pragma solidity ^0.5.16;
pragma experimental ABIEncoderV2;

/**
 * @title IPrime
 * @author Venus
 * @notice Interface for Prime Token
 */
interface IPrime {
    /**
     * @notice Executed by XVSVault whenever user's XVSVault balance changes
     * @param user the account address whose balance was updated
     */
    function xvsUpdated(address user) external;

    /**
     * @notice accrues interest and updates score for an user for a specific market
     * @param user the account address for which to accrue interest and update score
     * @param market the market for which to accrue interest and update score
     */
    function accrueInterestAndUpdateScore(address user, address market) external;

    /**
     * @notice Distributes income from market since last distribution
     * @param vToken the market for which to distribute the income
     */
    function accrueInterest(address vToken) external;

    /**
     * @notice Returns if user is a prime holder
     * @param isPrimeHolder returns if the user is a prime holder
     */
    function isUserPrimeHolder(address user) external view returns (bool isPrimeHolder);
}

pragma solidity ^0.5.0;

/**
 * @dev Interface of the BEP20 standard as defined in the EIP. Does not include
 * the optional functions; to access them see {BEP20Detailed}.
 */
interface IBEP20 {
    /**
     * @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);
}

pragma solidity ^0.5.16;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return add(a, b, "SafeMath: addition 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 add(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, errorMessage);

        return c;
    }

    /**
     * @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;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

pragma solidity ^0.5.16;

contract XVSVaultErrorReporter {
    enum Error {
        NO_ERROR,
        UNAUTHORIZED
    }

    enum FailureInfo {
        ACCEPT_ADMIN_PENDING_ADMIN_CHECK,
        ACCEPT_PENDING_IMPLEMENTATION_ADDRESS_CHECK,
        SET_PENDING_ADMIN_OWNER_CHECK,
        SET_PENDING_IMPLEMENTATION_OWNER_CHECK
    }

    /**
     * @dev `error` corresponds to enum Error; `info` corresponds to enum FailureInfo, and `detail` is an arbitrary
     * contract-specific code that enables us to report opaque error codes from upgradeable contracts.
     **/
    event Failure(uint error, uint info, uint detail);

    /**
     * @dev use this when reporting a known error from the money market or a non-upgradeable collaborator
     */
    function fail(Error err, FailureInfo info) internal returns (uint) {
        emit Failure(uint(err), uint(info), 0);

        return uint(err);
    }

    /**
     * @dev use this when reporting an opaque error from an upgradeable collaborator contract
     */
    function failOpaque(Error err, FailureInfo info, uint opaqueError) internal returns (uint) {
        emit Failure(uint(err), uint(info), opaqueError);

        return uint(err);
    }
}

pragma solidity ^0.5.16;

import "../Utils/SafeMath.sol";
import "../Utils/IBEP20.sol";
import "../Tokens/Prime/IPrime.sol";

contract XVSVaultAdminStorage {
    /**
     * @notice Administrator for this contract
     */
    address public admin;

    /**
     * @notice Pending administrator for this contract
     */
    address public pendingAdmin;

    /**
     * @notice Active brains of XVS Vault
     */
    address public implementation;

    /**
     * @notice Pending brains of XVS Vault
     */
    address public pendingXVSVaultImplementation;
}

contract XVSVaultStorageV1 is XVSVaultAdminStorage {
    /// @notice Guard variable for re-entrancy checks
    bool internal _notEntered;

    /// @notice The reward token store
    address public xvsStore;

    /// @notice The xvs token address
    address public xvsAddress;

    // Reward tokens created per block or second indentified by reward token address.
    mapping(address => uint256) public rewardTokenAmountsPerBlockOrSecond;

    /// @notice Info of each user.
    struct UserInfo {
        uint256 amount;
        uint256 rewardDebt;
        uint256 pendingWithdrawals;
    }

    // Info of each pool.
    struct PoolInfo {
        IBEP20 token; // Address of token contract to stake.
        uint256 allocPoint; // How many allocation points assigned to this pool.
        uint256 lastRewardBlockOrSecond; // Last block number or second that reward tokens distribution occurs.
        uint256 accRewardPerShare; // Accumulated per share, times 1e12. See below.
        uint256 lockPeriod; // Min time between withdrawal request and its execution.
    }

    // Infomation about a withdrawal request
    struct WithdrawalRequest {
        uint256 amount;
        uint128 lockedUntil;
        uint128 afterUpgrade;
    }

    // Info of each user that stakes tokens.
    mapping(address => mapping(uint256 => mapping(address => UserInfo))) internal userInfos;

    // Info of each pool.
    mapping(address => PoolInfo[]) public poolInfos;

    // Total allocation points. Must be the sum of all allocation points in all pools.
    mapping(address => uint256) public totalAllocPoints;

    // Info of requested but not yet executed withdrawals
    mapping(address => mapping(uint256 => mapping(address => WithdrawalRequest[]))) internal withdrawalRequests;

    /// @notice DEPRECATED A record of each accounts delegate (before the voting power fix)
    mapping(address => address) private __oldDelegatesSlot;

    /// @notice A checkpoint for marking number of votes from a given block or second
    struct Checkpoint {
        uint32 fromBlockOrSecond;
        uint96 votes;
    }

    /// @notice DEPRECATED A record of votes checkpoints for each account, by index (before the voting power fix)
    mapping(address => mapping(uint32 => Checkpoint)) private __oldCheckpointsSlot;

    /// @notice DEPRECATED The number of checkpoints for each account (before the voting power fix)
    mapping(address => uint32) private __oldNumCheckpointsSlot;

    /// @notice A record of states for signing / validating signatures
    mapping(address => uint) public nonces;

    /// @notice The EIP-712 typehash for the contract's domain
    bytes32 public constant DOMAIN_TYPEHASH =
        keccak256("EIP712Domain(string name,uint256 chainId,address verifyingContract)");

    /// @notice The EIP-712 typehash for the delegation struct used by the contract
    bytes32 public constant DELEGATION_TYPEHASH =
        keccak256("Delegation(address delegatee,uint256 nonce,uint256 expiry)");
}

contract XVSVaultStorage is XVSVaultStorageV1 {
    /// @notice A record of each accounts delegate
    mapping(address => address) public delegates;

    /// @notice A record of votes checkpoints for each account, by index
    mapping(address => mapping(uint32 => Checkpoint)) public checkpoints;

    /// @notice The number of checkpoints for each account
    mapping(address => uint32) public numCheckpoints;

    /// @notice Tracks pending withdrawals for all users for a particular reward token and pool id
    mapping(address => mapping(uint256 => uint256)) public totalPendingWithdrawals;

    /// @notice pause indicator for Vault
    bool public vaultPaused;

    /// @notice if the token is added to any of the pools
    mapping(address => bool) public isStakedToken;

    /// @notice Amount we owe to users because of failed transfer attempts
    mapping(address => mapping(address => uint256)) public pendingRewardTransfers;

    /// @notice Prime token contract address
    IPrime public primeToken;

    /// @notice Reward token for which prime token is issued for staking
    address public primeRewardToken;

    /// @notice Pool ID for which prime token is issued for staking
    uint256 public primePoolId;

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[46] private __gap;
}

{
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

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