Lock3r

// SPDX-License-Identifier: MIT
pragma solidity ^0.6.12;
pragma experimental ABIEncoderV2;



/**
 /$$                           /$$        /$$$$$$                  /$$   /$$             /$$                                       /$$      
| $$                          | $$       /$$__  $$                | $$$ | $$            | $$                                      | $$      
| $$        /$$$$$$   /$$$$$$$| $$   /$$|__/  \ $$  /$$$$$$       | $$$$| $$  /$$$$$$  /$$$$$$   /$$  /$$  /$$  /$$$$$$   /$$$$$$ | $$   /$$
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| $$      | $$  \ $$| $$      | $$$$$$/   |___  $$| $$  \__/      | $$  $$$$| $$$$$$$$  | $$    | $$ | $$ | $$| $$  \ $$| $$  \__/| $$$$$$/ 
| $$      | $$  | $$| $$      | $$_  $$  /$$  \ $$| $$            | $$\  $$$| $$_____/  | $$ /$$| $$ | $$ | $$| $$  | $$| $$      | $$_  $$ 
| $$$$$$$$|  $$$$$$/|  $$$$$$$| $$ \  $$|  $$$$$$/| $$            | $$ \  $$|  $$$$$$$  |  $$$$/|  $$$$$/$$$$/|  $$$$$$/| $$      | $$ \  $$
|________/ \______/  \_______/|__/  \__/ \______/ |__/            |__/  \__/ \_______/   \___/   \_____/\___/  \______/ |__/      |__/  \__/

 /$$$$$$$$        /$$                                  /$$$$$$                        /$$                                    /$$    
|__  $$__/       | $$                                 /$$__  $$                      | $$                                   | $$    
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   | $$| $$  \ $$| $$$$$$/ | $$$$$$$$| $$  \ $$      | $$      | $$  \ $$| $$  \ $$  | $$    | $$  \__/ /$$$$$$$| $$        | $$    
   | $$| $$  | $$| $$_  $$ | $$_____/| $$  | $$      | $$    $$| $$  | $$| $$  | $$  | $$ /$$| $$      /$$__  $$| $$        | $$ /$$
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   |__/ \______/ |__/  \__/ \_______/|__/  |__/       \______/  \______/ |__/  |__/   \___/  |__/      \_______/ \_______/   \___/  

 * 
*/


// From https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/math/Math.sol
// Subject to the MIT license.
/**
 * @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(uint a, uint b) internal pure returns (uint) {
        uint c = a + b;
        require(c >= a, "add: +");

        return c;
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting with custom message on overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     * - Addition cannot overflow.
     */
    function add(uint a, uint b, string memory errorMessage) internal pure returns (uint) {
        uint c = a + b;
        require(c >= a, errorMessage);

        return c;
    }

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

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

        uint c = a * b;
        require(c / a == b, "mul: *");

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     * - Multiplication cannot overflow.
     */
    function mul(uint a, uint b, string memory errorMessage) internal pure returns (uint) {
        // 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;
        }

        uint c = a * b;
        require(c / a == b, errorMessage);

        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(uint a, uint b) internal pure returns (uint) {
        return div(a, b, "div: /");
    }

    /**
     * @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(uint a, uint b, string memory errorMessage) internal pure returns (uint) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, errorMessage);
        uint 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(uint a, uint b) internal pure returns (uint) {
        return mod(a, b, "mod: %");
    }

    /**
     * @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(uint a, uint b, string memory errorMessage) internal pure returns (uint) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

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

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

    uint256 private _status;

    constructor () internal {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

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

        _;

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

/**
 * @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);
}

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
        // for accounts without code, i.e. `keccak256('')`
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash := extcodehash(account) }
        return (codehash != accountHash && codehash != 0x0);
    }

    /**
     * @dev Converts an `address` into `address payable`. Note that this is
     * simply a type cast: the actual underlying value is not changed.
     *
     * _Available since v2.4.0._
     */
    function toPayable(address account) internal pure returns (address payable) {
        return address(uint160(account));
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     *
     * _Available since v2.4.0._
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient");

        // solhint-disable-next-line avoid-call-value
        (bool success, ) = recipient.call{value:amount}("");
        require(success, "Address: reverted");
    }
}

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for ERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: < 0");
        callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves.

        // A Solidity high level call has three parts:
        //  1. The target address is checked to verify it contains contract code
        //  2. The call itself is made, and success asserted
        //  3. The return value is decoded, which in turn checks the size of the returned data.
        // solhint-disable-next-line max-line-length
        require(address(token).isContract(), "SafeERC20: !contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = address(token).call(data);
        require(success, "SafeERC20: low-level call failed");

        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: !succeed");
        }
    }
}

library Lock3rV1Library {
    function getReserve(address pair, address reserve) external view returns (uint) {
        (uint _r0, uint _r1,) = IUniswapV2Pair(pair).getReserves();
        if (IUniswapV2Pair(pair).token0() == reserve) {
            return _r0;
        } else if (IUniswapV2Pair(pair).token1() == reserve) {
            return _r1;
        } else {
            return 0;
        }
    }

}

interface IUniswapV2Pair {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function name() external pure returns (string memory);
    function symbol() external pure returns (string memory);
    function decimals() external pure returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);
    function PERMIT_TYPEHASH() external pure returns (bytes32);
    function nonces(address owner) external view returns (uint);

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;

    event Fund(address indexed sender, uint amount0, uint amount1);
    event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint amount0In,
        uint amount1In,
        uint amount0Out,
        uint amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint);
    function factory() external view returns (address);
    function token0() external view returns (address);
    function token1() external view returns (address);
    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
    function price0CumulativeLast() external view returns (uint);
    function price1CumulativeLast() external view returns (uint);
    function kLast() external view returns (uint);

    function fund(address to) external returns (uint liquidity);
    function burn(address to) external returns (uint amount0, uint amount1);
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
    function skim(address to) external;
    function sync() external;

    function initialize(address, address) external;
}

interface IGovernance {
    function proposeJob(address job) external;
    function slash(address bonded, address locker, uint amount) external;
}

interface ILock3rV1Helper {
    function getQuoteLimit(uint gasUsed) external view returns (uint);
}

contract Lock3r is ReentrancyGuard {
    using SafeMath for uint;
    using SafeERC20 for IERC20;

    /// @notice Lock3r Helper to set max prices for the ecosystem
    ILock3rV1Helper public LK3RH;

    /// @notice EIP-20 token name for this token //Joe Biden
    string public constant name = "Lock3r";

    /// @notice EIP-20 token symbol for this token // is
    string public constant symbol = "LK3R";

    /// @notice EIP-20 token decimals for this token //POTUS - God Bless America
    uint8 public constant decimals = 18;

    /// @notice Total number of tokens in circulation
    uint public totalSupply = 200000e18; // Total Supply = 200,000 - No more can be created/minted thanks to @sosoliditycrew on TG

    /// @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;

    mapping (address => mapping (address => uint)) internal allowances;
    mapping (address => uint) internal balances;

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

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

    /// @notice The EIP-712 typehash for the permit struct used by the contract
    bytes32 public constant PERMIT_TYPEHASH = keccak256("Permit(address owner,address spender,uint value,uint nonce,uint deadline)");


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

    /// @notice An event thats emitted when an account changes its delegate
    event DelegateChanged(address indexed delegator, address indexed fromDelegate, address indexed toDelegate);

    /// @notice An event thats emitted when a delegate account's vote balance changes
    event DelegateVotesChanged(address indexed delegate, uint previousBalance, uint newBalance);

    /// @notice A checkpoint for marking number of votes from a given block
    struct Checkpoint {
        uint32 fromBlock;
        uint votes;
    }

    /**
     * @notice Delegate votes from `msg.sender` to `delegatee`
     * @param delegatee The address to delegate votes to
     */
    function delegate(address delegatee) public {
        _delegate(msg.sender, delegatee);
    }

    /**
     * @notice Delegates votes from signatory to `delegatee`
     * @param delegatee The address to delegate votes to
     * @param nonce The contract state required to match the signature
     * @param expiry The time at which to expire the signature
     * @param v The recovery byte of the signature
     * @param r Half of the ECDSA signature pair
     * @param s Half of the ECDSA signature pair
     */
    function delegateBySig(address delegatee, uint nonce, uint expiry, uint8 v, bytes32 r, bytes32 s) public {
        bytes32 structHash = keccak256(abi.encode(DELEGATION_TYPEHASH, delegatee, nonce, expiry));
        bytes32 digest = keccak256(abi.encodePacked("\x19\x01", DOMAINSEPARATOR, structHash));
        address signatory = ecrecover(digest, v, r, s);
        require(signatory != address(0), "delegateBySig: sig");
        require(nonce == nonces[signatory]++, "delegateBySig: nonce");
        require(now <= expiry, "delegateBySig: expired");
        _delegate(signatory, delegatee);
    }

    /**
     * @notice Gets the current votes balance for `account`
     * @param account The address to get votes balance
     * @return The number of current votes for `account`
     */
    function getCurrentVotes(address account) external view returns (uint) {
        uint32 nCheckpoints = numCheckpoints[account];
        return nCheckpoints > 0 ? checkpoints[account][nCheckpoints - 1].votes : 0;
    }

    /**
     * @notice Determine the prior number of votes for an account as of a block number
     * @dev Block number must be a finalized block or else this function will revert to prevent misinformation.
     * @param account The address of the account to check
     * @param blockNumber The block number to get the vote balance at
     * @return The number of votes the account had as of the given block
     */
    function getPriorVotes(address account, uint blockNumber) public view returns (uint) {
        require(blockNumber < block.number, "getPriorVotes:");

        uint32 nCheckpoints = numCheckpoints[account];
        if (nCheckpoints == 0) {
            return 0;
        }

        // First check most recent balance
        if (checkpoints[account][nCheckpoints - 1].fromBlock <= blockNumber) {
            return checkpoints[account][nCheckpoints - 1].votes;
        }

        // Next check implicit zero balance
        if (checkpoints[account][0].fromBlock > blockNumber) {
            return 0;
        }

        uint32 lower = 0;
        uint32 upper = nCheckpoints - 1;
        while (upper > lower) {
            uint32 center = upper - (upper - lower) / 2; // ceil, avoiding overflow
            Checkpoint memory cp = checkpoints[account][center];
            if (cp.fromBlock == blockNumber) {
                return cp.votes;
            } else if (cp.fromBlock < blockNumber) {
                lower = center;
            } else {
                upper = center - 1;
            }
        }
        return checkpoints[account][lower].votes;
    }

    function _delegate(address delegator, address delegatee) internal {
        address currentDelegate = delegates[delegator];
        uint delegatorBalance = votes[delegator].add(bonds[delegator][address(this)]);
        delegates[delegator] = delegatee;

        emit DelegateChanged(delegator, currentDelegate, delegatee);

        _moveDelegates(currentDelegate, delegatee, delegatorBalance);
    }

    function _moveDelegates(address srcRep, address dstRep, uint amount) internal {
        if (srcRep != dstRep && amount > 0) {
            if (srcRep != address(0)) {
                uint32 srcRepNum = numCheckpoints[srcRep];
                uint srcRepOld = srcRepNum > 0 ? checkpoints[srcRep][srcRepNum - 1].votes : 0;
                uint srcRepNew = srcRepOld.sub(amount, "_moveVotes: underflows");
                _writeCheckpoint(srcRep, srcRepNum, srcRepOld, srcRepNew);
            }

            if (dstRep != address(0)) {
                uint32 dstRepNum = numCheckpoints[dstRep];
                uint dstRepOld = dstRepNum > 0 ? checkpoints[dstRep][dstRepNum - 1].votes : 0;
                uint dstRepNew = dstRepOld.add(amount);
                _writeCheckpoint(dstRep, dstRepNum, dstRepOld, dstRepNew);
            }
        }
    }

    function _writeCheckpoint(address delegatee, uint32 nCheckpoints, uint oldVotes, uint newVotes) internal {
      uint32 blockNumber = safe32(block.number, "_writeCheckpoint: 32 bits");

      if (nCheckpoints > 0 && checkpoints[delegatee][nCheckpoints - 1].fromBlock == blockNumber) {
          checkpoints[delegatee][nCheckpoints - 1].votes = newVotes;
      } else {
          checkpoints[delegatee][nCheckpoints] = Checkpoint(blockNumber, newVotes);
          numCheckpoints[delegatee] = nCheckpoints + 1;
      }

      emit DelegateVotesChanged(delegatee, oldVotes, newVotes);
    }

    function safe32(uint n, string memory errorMessage) internal pure returns (uint32) {
        require(n < 2**32, errorMessage);
        return uint32(n);
    }

    /// @notice The standard EIP-20 transfer event
    event Transfer(address indexed from, address indexed to, uint amount);

    /// @notice The standard EIP-20 approval event
    event Approval(address indexed owner, address indexed spender, uint amount);

    /// @notice Submit a job
    event SubmitJob(address indexed job, address indexed liquidity, address indexed provider, uint block, uint credit);

    /// @notice Apply credit to a job
    event ApplyCredit(address indexed job, address indexed liquidity, address indexed provider, uint block, uint credit);

    /// @notice Remove credit for a job
    event RemoveJob(address indexed job, address indexed liquidity, address indexed provider, uint block, uint credit);

    /// @notice Unbond credit for a job
    event UnbondJob(address indexed job, address indexed liquidity, address indexed provider, uint block, uint credit);

    /// @notice Added a Job
    event JobAdded(address indexed job, uint block, address governance);

    /// @notice Removed a job
    event JobRemoved(address indexed job, uint block, address governance);

    /// @notice Worked a job
    event LockerWorked(address indexed credit, address indexed job, address indexed locker, uint block, uint amount);

    /// @notice Locker bonding
    event LockerBonding(address indexed locker, uint block, uint active, uint bond);

    /// @notice Locker bonded
    event LockerBonded(address indexed locker, uint block, uint activated, uint bond);

    /// @notice Locker unbonding
    event LockerUnbonding(address indexed locker, uint block, uint deactive, uint bond);

    /// @notice Locker unbound
    event LockerUnbound(address indexed locker, uint block, uint deactivated, uint bond);
    
    /// @notice Locker slashed
    event LockerSlashed(address indexed locker, address indexed slasher, uint block, uint slash);
      
      /// @notice Locker disputed
    event LockerDispute(address indexed locker, uint block);
    
    /// @notice Locker resolved
    event LockerResolved(address indexed locker, uint block);

    event AddCredit(address indexed credit, address indexed job, address indexed creditor, uint block, uint amount);
    
     /// @notice Locker rights approved to be spent by spender
    event LockerRightApproval(address indexed owner, address indexed bonding ,address indexed spender, bool allowed);

    /// @notice Locker right transfered to a new address
    event LockerRightTransfered(address indexed from, address indexed to, address indexed bond);


    /// @notice 2 days to bond to become a locker
    uint public BOND = 2 days;
    /// @notice 7 days to unbond to remove funds from being a locker
    uint public UNBOND = 7 days;
    /// @notice 2 days till liquidity can be bound
    uint public LIQUIDITYBOND = 2 days;

    /// @notice direct liquidity fee 0.3% - This can be modified via governance contract
    uint public FEE = 30;                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
    uint constant public BASE = 10000;

    /// @notice address used for ETH transfers
    address constant public ETH = address(0xE);

    /// @notice tracks all current bondings (time)
    mapping(address => mapping(address => uint)) public bondings;
    /// @notice tracks all current unbondings (time)
    mapping(address => mapping(address => uint)) public unbondings;
    /// @notice allows for partial unbonding
    mapping(address => mapping(address => uint)) public partialUnbonding;
    /// @notice tracks all current pending bonds (amount)
    mapping(address => mapping(address => uint)) public pendingbonds;
    /// @notice tracks how much a locker has bonded
    mapping(address => mapping(address => uint)) public bonds;
    /// @notice tracks underlying votes (that don't have bond)
    mapping(address => uint) public votes;

    /// @notice total bonded (totalSupply for bonds)
    uint public totalBonded = 0;
    /// @notice tracks when a locker was first registered
    mapping(address => uint) public firstSeen;
    	
    /// @notice tracks if a locker has a pending dispute
    mapping(address => bool) public disputes;

    /// @notice tracks last job performed for a locker
    mapping(address => uint) public lastJob;
    /// @notice tracks the total job executions for a locker
    mapping(address => uint) public workCompleted;
    /// @notice list of all jobs registered for the locker system
    mapping(address => bool) public jobs;
    /// @notice the current credit available for a job
    mapping(address => mapping(address => uint)) public credits;
    /// @notice the balances for the liquidity providers
    mapping(address => mapping(address => mapping(address => uint))) public liquidityProvided;
    /// @notice liquidity unbonding days
    mapping(address => mapping(address => mapping(address => uint))) public liquidityUnbonding;
    /// @notice liquidity unbonding amounts
    mapping(address => mapping(address => mapping(address => uint))) public liquidityAmountsUnbonding;
    /// @dev job proposal delay
    mapping(address => uint) public jobProposalDelay;
    /// @notice liquidity apply date
    mapping(address => mapping(address => mapping(address => uint))) public liquidityApplied;
    /// @notice liquidity amount to apply
    mapping(address => mapping(address => mapping(address => uint))) public liquidityAmount;

    /// @notice list of all current lockers
    mapping(address => bool) public lockers;
    /// @notice blacklist of lockers not allowed to participate
    mapping(address => bool) public blacklist;
    
    //Allowances of transfer rights of locker rights
    //first address is user,second is the spender,3rd is the bonding that may be allowed to be spent,finally last is bool if its allowed
    mapping(address => mapping (address => mapping(address => bool))) internal LockerAllowances;

    /// @notice traversable array of lockers to make external management easier
    address[] public lockerList;
    /// @notice traversable array of jobs to make external management easier
    address[] public jobList;

    /// @notice governance address for the governance contract
    address public governance;
    address public pendingGovernance;
    
     /// @notice treasury address for the treasury contract
    address public treasury;

    /// @notice the liquidity token supplied by users paying for jobs
    mapping(address => bool) public liquidityAccepted;

    address[] public liquidityPairs;

    uint internal _gasUsed;
    
    // Ethereum 101 - Constructors can only be called once
    constructor() public {  
        // Set governance for this token
        governance = msg.sender;
        // Set Treasury for this token
        treasury = msg.sender;
        balances[msg.sender] = balances[msg.sender].add(totalSupply);
        // Supply needs to start in the hands of the contract creator
        emit Transfer (address(0),msg.sender, totalSupply);
        DOMAINSEPARATOR = keccak256(abi.encode(DOMAIN_TYPEHASH, keccak256(bytes(name)), _getChainId(), address(this)));
    }
    
    
    modifier onlyGovernance(){
        require(msg.sender == governance);
        _;
    }
    

    /**
     * @notice Add ETH credit to a job to be paid out for work
     * @param job the job being credited
     */
    function addCreditETH(address job) external payable {
        require(jobs[job], "addCreditETH: !job");
        uint _fee = msg.value.mul(FEE).div(BASE);
        credits[job][ETH] = credits[job][ETH].add(msg.value.sub(_fee));
        payable(governance).transfer(_fee);

        emit AddCredit(ETH, job, msg.sender, block.number, msg.value);
    }

    /**
     * @notice Add credit to a job to be paid out for work
     * @param credit the credit being assigned to the job
     * @param job the job being credited
     * @param amount the amount of credit being added to the job
     */
    function addCredit(address credit, address job, uint amount) external nonReentrant {
        require(jobs[job], "addCreditETH: !job");
        uint _before = IERC20(credit).balanceOf(address(this));
        IERC20(credit).safeTransferFrom(msg.sender, address(this), amount);
        uint _received = IERC20(credit).balanceOf(address(this)).sub(_before);
        uint _fee = _received.mul(FEE).div(BASE);
        credits[job][credit] = credits[job][credit].add(_received.sub(_fee));
        IERC20(credit).safeTransfer(governance, _fee);

        emit AddCredit(credit, job, msg.sender, block.number, _received);
    }

    /**
     * @notice Add non transferable votes for governance
     * @param voter to add the votes to
     * @param amount of votes to add
     */
    function addVotes(address voter, uint amount) external onlyGovernance{
        _activate(voter, address(this));
        votes[voter] = votes[voter].add(amount);
        totalBonded = totalBonded.add(amount);
        _moveDelegates(address(0), delegates[voter], amount);
    }

    /**
     * @notice Remove non transferable votes for governance
     * @param voter to subtract the votes
     * @param amount of votes to remove
     */
    function removeVotes(address voter, uint amount) external onlyGovernance{
        votes[voter] = votes[voter].sub(amount);
        totalBonded = totalBonded.sub(amount);
        _moveDelegates(delegates[voter], address(0), amount);
    }

    /**
     * @notice Add credit to a job to be paid out for work
     * @param job the job being credited
     * @param amount the amount of credit being added to the job
     */
    function addLK3RCredit(address job, uint amount) external onlyGovernance{
        require(jobs[job], "addLK3RCredit: !job");
        credits[job][address(this)] = credits[job][address(this)].add(amount);
        _fund(address(this), amount);

        emit AddCredit(address(this), job, msg.sender, block.number, amount);
    }

    /**
     * @notice Approve a liquidity pair for being accepted in future
     * @param liquidity the liquidity no longer accepted
     */
    function approveLiquidity(address liquidity) external onlyGovernance{
        require(!liquidityAccepted[liquidity], "approveLiquidity: !pair");
        liquidityAccepted[liquidity] = true;
        liquidityPairs.push(liquidity);
    }

    /**
     * @notice Revoke a liquidity pair from being accepted in future
     * @param liquidity the liquidity no longer accepted
     */
    function revokeLiquidity(address liquidity) external onlyGovernance{
        liquidityAccepted[liquidity] = false;
    }
    
    /**
     * @notice Set new liquidity fee from governance
     * @param newFee the new fee for further liquidity adds
     */
    function setLiquidityFee(uint newFee) external onlyGovernance{
        FEE = newFee;
    }

    /**
     * @notice Set bonding delay from governance
     * @param newBond the new bonding delay
     */
    function setBondingDelay(uint newBond) external onlyGovernance{
        BOND = newBond;
    }

    /**
     * @notice Set bonding delay from governance
     * @param newUnbond the new unbonding delay
     */
    function setUnbondingDelay(uint newUnbond) external onlyGovernance{
        UNBOND = newUnbond;
    }

    /**
     * @notice Set liquidity bonding delay from governance
     * @param newLiqBond the new liquidity bonding delay
     */
    function setLiquidityBondingDelay(uint newLiqBond) external onlyGovernance{
        LIQUIDITYBOND = newLiqBond;
    }

    /**
     * @notice Displays all accepted liquidity pairs
     */
    function pairs() external view returns (address[] memory) {
        return liquidityPairs;
    }

    /**
     * @notice Allows liquidity providers to submit jobs
     * @param liquidity the liquidity being added
     * @param job the job to assign credit to
     * @param amount the amount of liquidity tokens to use
     */
    function addLiquidityToJob(address liquidity, address job, uint amount) external nonReentrant {
        require(liquidityAccepted[liquidity], "addLiquidityToJob: !pair");
        IERC20(liquidity).safeTransferFrom(msg.sender, address(this), amount);
        liquidityProvided[msg.sender][liquidity][job] = liquidityProvided[msg.sender][liquidity][job].add(amount);

        liquidityApplied[msg.sender][liquidity][job] = now;
        liquidityAmount[msg.sender][liquidity][job] = liquidityAmount[msg.sender][liquidity][job].add(amount);

        if (!jobs[job] && jobProposalDelay[job].add(UNBOND) < now) {
            IGovernance(governance).proposeJob(job);
            jobProposalDelay[job] = now;
        }
        emit SubmitJob(job, liquidity, msg.sender, block.number, amount);
    }

    /**
     * @notice Applies the credit provided in addLiquidityToJob to the job
     * @param provider the liquidity provider
     * @param liquidity the pair being added as liquidity
     * @param job the job that is receiving the credit
     */
    function applyCreditToJob(address provider, address liquidity, address job) external {
        require(liquidityAccepted[liquidity], "addLiquidityToJob: !pair");
        require(liquidityApplied[provider][liquidity][job] != 0, "credit: no bond");
        require(block.timestamp.sub(liquidityApplied[provider][liquidity][job].add(LIQUIDITYBOND)) >= 0, "credit: bonding");
        uint _liquidity = Lock3rV1Library.getReserve(liquidity, address(this));
        uint _credit = _liquidity.mul(liquidityAmount[provider][liquidity][job]).div(IERC20(liquidity).totalSupply());
        _fund(address(this), _credit);
        credits[job][address(this)] = credits[job][address(this)].add(_credit);
        liquidityAmount[provider][liquidity][job] = 0;

        emit ApplyCredit(job, liquidity, provider, block.number, _credit);
    }

    /**
     * @notice Unbond liquidity for a job
     * @param liquidity the pair being unbound
     * @param job the job being unbound from
     * @param amount the amount of liquidity being removed
     */
    function unbondLiquidityFromJob(address liquidity, address job, uint amount) external {
        require(liquidityAmount[msg.sender][liquidity][job] == 0, "credit: pending credit");
        liquidityUnbonding[msg.sender][liquidity][job] = now;
        liquidityAmountsUnbonding[msg.sender][liquidity][job] = liquidityAmountsUnbonding[msg.sender][liquidity][job].add(amount);
        require(liquidityAmountsUnbonding[msg.sender][liquidity][job] <= liquidityProvided[msg.sender][liquidity][job], "unbondLiquidityFromJob: insufficient funds");

        uint _liquidity = Lock3rV1Library.getReserve(liquidity, address(this));
        uint _credit = _liquidity.mul(amount).div(IERC20(liquidity).totalSupply());
        if (_credit > credits[job][address(this)]) {
            _burn(address(this), credits[job][address(this)]);
            credits[job][address(this)] = 0;
        } else {
            _burn(address(this), _credit);
            credits[job][address(this)] = credits[job][address(this)].sub(_credit);
        }

        emit UnbondJob(job, liquidity, msg.sender, block.number, amount);
    }

    /**
     * @notice Allows liquidity providers to remove liquidity
     * @param liquidity the pair being unbound
     * @param job the job being unbound from
     */
    function removeLiquidityFromJob(address liquidity, address job) external {
        require(liquidityUnbonding[msg.sender][liquidity][job] != 0, "removeJob: unbond");
        require(block.timestamp.sub(liquidityUnbonding[msg.sender][liquidity][job].add(UNBOND)) >= 0 , "removeJob: unbonding");
        uint _amount = liquidityAmountsUnbonding[msg.sender][liquidity][job];
        liquidityProvided[msg.sender][liquidity][job] = liquidityProvided[msg.sender][liquidity][job].sub(_amount);
        liquidityAmountsUnbonding[msg.sender][liquidity][job] = 0;
        IERC20(liquidity).safeTransfer(msg.sender, _amount);

        emit RemoveJob(job, liquidity, msg.sender, block.number, _amount);
    }

    /**
     * @notice Allows treasury to fund new tokens to a job contract
     * @param amount the amount of tokens to fund to a job contract
     * Only Governance can fund a job contract from the treasury
     */
    function fund(uint amount) external onlyGovernance{
        _fund(treasury, amount);
    }

    /**
     * @notice burn owned tokens
     * @param amount the amount of tokens to burn
     */
    function burn(uint amount) external {
        _burn(msg.sender, amount);
    }

    function _fund(address dst, uint amount) internal {
        // transfer the amount to the recipient
        //Unit test job contracts cannot be funded if the treasury has insufficient funds
        require(balances[treasury] >= (amount), "treasury: exceeds balance");
        balances[dst] = balances[dst].add(amount);
        balances[treasury] = balances[treasury].sub(amount);
        emit Transfer(treasury, dst, amount);
    }

    function _burn(address dst, uint amount) internal {
        require(dst != address(0), "_burn: zero address");
        balances[dst] = balances[dst].sub(amount, "_burn: exceeds balance");
        totalSupply = totalSupply.sub(amount);
        emit Transfer(dst, address(0), amount);
    }

    /**
     * @notice Implemented by jobs to show that a locker performed work
     * @param locker address of the locker that performed the work
     */
    function worked(address locker) external {
        workReceipt(locker, LK3RH.getQuoteLimit(_gasUsed.sub(gasleft())));
    }
    
    /**
     * @notice Implemented by jobs to show that a locker performed work and get paid in ETH
     * @param locker address of the locker that performed the work
     */
    function workedETH(address locker) external {
        receiptETH(locker, LK3RH.getQuoteLimit(_gasUsed.sub(gasleft())));
    }
    
    /**
     * @notice Implemented by jobs to show that a locker performed work
     * @param locker address of the locker that performed the work
     * @param amount the reward that should be allocated
     */
    function workReceipt(address locker, uint amount) public {
        require(jobs[msg.sender], "workReceipt: !job");
        require(amount <= LK3RH.getQuoteLimit(_gasUsed.sub(gasleft())), "workReceipt: max limit");
        credits[msg.sender][address(this)] = credits[msg.sender][address(this)].sub(amount, "workReceipt: insuffient funds");
        lastJob[locker] = now;
        _reward(locker, amount);
        workCompleted[locker] = workCompleted[locker].add(amount);
        emit LockerWorked(address(this), msg.sender, locker, block.number, amount);
    }

    /**
     * @notice Implemented by jobs to show that a locker performed work
     * @param credit the asset being awarded to the locker
     * @param locker address of the locker that performed the work
     * @param amount the reward that should be allocated
     */
    function receipt(address credit, address locker, uint amount) external {
        require(jobs[msg.sender], "receipt: !job");
        credits[msg.sender][credit] = credits[msg.sender][credit].sub(amount, "workReceipt: insuffient funds");
        lastJob[locker] = now;
        IERC20(credit).safeTransfer(locker, amount);
        emit LockerWorked(credit, msg.sender, locker, block.number, amount);
    }

    /**
     * @notice Implemented by jobs to show that a locker performed work
     * @param locker address of the locker that performed the work
     * @param amount the amount of ETH sent to the locker
     */
    function receiptETH(address locker, uint amount) public {
        require(jobs[msg.sender], "receipt: !job");
        credits[msg.sender][ETH] = credits[msg.sender][ETH].sub(amount, "workReceipt: insuffient funds");
        lastJob[locker] = now;
        payable(locker).transfer(amount);
        emit LockerWorked(ETH, msg.sender, locker, block.number, amount);
    }
    
    
    function _reward(address _from, uint _amount) internal {
        bonds[_from][address(this)] = bonds[_from][address(this)].add(_amount);
        totalBonded = totalBonded.add(_amount);
        _moveDelegates(address(0), delegates[_from], _amount);
        emit Transfer(msg.sender, _from, _amount);
    }

    function _bond(address bonding, address _from, uint _amount) internal {
        bonds[_from][bonding] = bonds[_from][bonding].add(_amount);
        if (bonding == address(this)) {
            totalBonded = totalBonded.add(_amount);
            _moveDelegates(address(0), delegates[_from], _amount);
        }
    }

    function _unbond(address bonding, address _from, uint _amount) internal {
        bonds[_from][bonding] = bonds[_from][bonding].sub(_amount);
        if (bonding == address(this)) {
            totalBonded = totalBonded.sub(_amount);
            _moveDelegates(delegates[_from], address(0), _amount);
        }

    }

    /**
     * @notice Allows governance to add new job systems
     * @param job address of the contract for which work should be performed
     */
    function addJob(address job) external onlyGovernance{
        require(!jobs[job], "addJob: job known");
        jobs[job] = true;
        jobList.push(job);
        emit JobAdded(job, block.number, msg.sender);
    }

    /**
     * @notice Full listing of all jobs ever added
     * @return array blob
     */
    function getJobs() external view returns (address[] memory) {
        return jobList;
    }

    /**
     * @notice Allows governance to remove a job from the systems
     * @param job address of the contract for which work should be performed
     */
    function removeJob(address job) external onlyGovernance{
        jobs[job] = false;
        emit JobRemoved(job, block.number, msg.sender);
    }

    /**
     * @notice Allows governance to change the Lock3rHelper for max spend
     * @param _lk3rh new helper address to set
     */
    function setLock3rHelper(ILock3rV1Helper _lk3rh) external onlyGovernance{
        LK3RH = ILock3rV1Helper(_lk3rh);
    }

    /**
     * @notice Allows governance to change governance (for future upgradability)
     * @param _governance new governance address to set
     */
    function setGovernance(address _governance) external onlyGovernance {
        pendingGovernance = _governance;
    }

    /**
     * @notice Allows pendingGovernance to accept their role as governances(protection pattern)
     */
    function acceptGovernance() external {
        require(msg.sender == pendingGovernance, "acceptGovernance: !pendingGov");
        governance = pendingGovernance;
    }
    
    /**
     * @notice Allows treasury to change treasury(for future upgradability)
     * @param _treasury new treasury address to set
     */
    function setTreasury(address _treasury) external onlyGovernance{
        treasury = _treasury;
    }

    /**
     * @notice confirms if the current locker is registered, can be used for general (non critical) functions
     * @param locker the locker being investigated
     * @return true/false if the address is a locker
     */
    function isLocker(address locker) public returns (bool) {
        _gasUsed = gasleft();
        return lockers[locker];
    }

    /**
     * @notice confirms if the current locker is registered and has a minimum bond, should be used for protected functions
     * @param locker the locker being investigated
     * @param minBond the minimum requirement for the asset provided in bond
     * @param earned the total funds earned in the lockers lifetime
     * @param age the age of the locker in the system
     * @return true/false if the address is a locker and has more than the bond
     */
    function isMinLocker(address locker, uint minBond, uint earned, uint age) external returns (bool) {
        _gasUsed = gasleft();
        return lockers[locker]
                && bonds[locker][address(this)].add(votes[locker]) >= minBond
                && workCompleted[locker] >= earned
                && now.sub(firstSeen[locker]) >= age;
    }

    /**
     * @notice confirms if the current locker is registered and has a minimum bond, should be used for protected functions
     * @param locker the locker being investigated
     * @param bond the bound asset being evaluated
     * @param minBond the minimum requirement for the asset provided in bond
     * @param earned the total funds earned in the lockers lifetime
     * @param age the age of the locker in the system
     * @return true/false if the address is a locker and has more than the bond
     */
    function isBondedLocker(address locker, address bond, uint minBond, uint earned, uint age) external returns (bool) {
        _gasUsed = gasleft();
        return lockers[locker]
                && bonds[locker][bond] >= minBond
                && workCompleted[locker] >= earned
                && now.sub(firstSeen[locker]) >= age;
    }

    /**
     * @notice begin the bonding process for a new locker
     * @param bonding the asset being bound
     * @param amount the amount of bonding asset being bound
     */
    function bond(address bonding, uint amount) external nonReentrant {
        require(!blacklist[msg.sender], "blacklisted");
        bondings[msg.sender][bonding] = now;
        if (bonding == address(this)) {
            _transferTokens(msg.sender, address(this), amount);
        } else {
            uint _before = IERC20(bonding).balanceOf(address(this));
            IERC20(bonding).safeTransferFrom(msg.sender, address(this), amount);
            amount = IERC20(bonding).balanceOf(address(this)).sub(_before);
        }
        pendingbonds[msg.sender][bonding] = pendingbonds[msg.sender][bonding].add(amount);
        emit LockerBonding(msg.sender, block.number, bondings[msg.sender][bonding], amount);
    }

    /**
     * @notice get full list of lockers in the system
     */
    function getLockers() external view returns (address[] memory) {
        return lockerList;
    }

   /**
     * @notice Does initial data initialization of locker entry
     * @param sender the address to init data for
     */
    function doDataInit(address sender) internal {
        if (firstSeen[sender] == 0) {
          firstSeen[sender] = now;
          lockerList.push(sender);
          lastJob[sender] = now;
        }
    }

    /**
     * @notice allows a locker to activate/register themselves after bonding
     * @param bonding the asset being activated as bond collateral
     */
    function activate(address bonding) external {
        require(!blacklist[msg.sender], "blacklisted");
        //In this part we changed the check of bonding time being lesser than now to check if current time is > bonding time
        require(bondings[msg.sender][bonding] != 0 && block.timestamp.sub(bondings[msg.sender][bonding].add(BOND)) >= 0, "bonding");
        //Setup initial data
        doDataInit(msg.sender);
        _activate(msg.sender, bonding);
    }

    function _activate(address locker, address bonding) internal {
        lockers[locker] = true;
        _bond(bonding, locker, pendingbonds[locker][bonding]);
        pendingbonds[locker][bonding] = 0;
        emit LockerBonded(locker, block.number, block.timestamp, bonds[locker][bonding]);
    }

    /**
     * @notice allows a locker to transfer their locker rights and bonds to another address
     * @param bonding the asset being transfered to new address as bond collateral
     * @param from the address locker rights and bonding amount is transfered from
     * @param to the address locker rights and bonding amount is transfered to
     */
    function transferLockerRight(address bonding,address from,address to) public {
     
        require(isLocker(from));
        require(msg.sender == from || LockerAllowances[from][msg.sender][bonding]);
        require(bondings[from][bonding] != 0 && block.timestamp.sub(bondings[from][bonding].add(BOND)) >= 0);

        doDataInit(to);

        //Set the user calling locker stat to false
        lockers[from] = false;
        //Set the to addr locker stat to true
        lockers[to] = true;

        //Unbond from sender
        uint currentbond = bonds[from][bonding];
        _unbond(bonding,from,currentbond);
        //Bond to receiver
        _bond(bonding,to,currentbond);
        //remove rights for this address after transfer is done from caller
        LockerAllowances[from][msg.sender][bonding] = false;
        emit LockerRightTransfered(from,to,bonding);
    }

    /**
     * @notice begin the unbonding process to stop being a locker
     * @param bonding the asset being unbound
     * @param amount allows for partial unbonding
     */
    function unbond(address bonding, uint amount) external {
        unbondings[msg.sender][bonding] = now;
        _unbond(bonding, msg.sender, amount);
        partialUnbonding[msg.sender][bonding] = partialUnbonding[msg.sender][bonding].add(amount);
        emit LockerUnbonding(msg.sender, block.number, unbondings[msg.sender][bonding], amount);
    }

    /**
     * @notice withdraw funds after unbonding has finished
     * @param bonding the asset to withdraw from the bonding pool
     */
    function withdraw(address bonding) external nonReentrant {
        require(unbondings[msg.sender][bonding] != 0 &&block.timestamp.sub(unbondings[msg.sender][bonding].add(UNBOND)) >= 0, "withdraw: unbonding");
        require(!disputes[msg.sender], "disputes");

        if (bonding == address(this)) {
            _transferTokens(address(this), msg.sender, partialUnbonding[msg.sender][bonding]);
        } else {
            IERC20(bonding).safeTransfer(msg.sender, partialUnbonding[msg.sender][bonding]);
        }
        emit LockerUnbound(msg.sender, block.number, block.timestamp, partialUnbonding[msg.sender][bonding]);
        partialUnbonding[msg.sender][bonding] = 0;
    }
    
    /**
     * @notice blacklists a locker from participating in the network
     * @param locker the address being slashed
     */
    function revoke(address locker) external onlyGovernance{
        lockers[locker] = false;
        blacklist[locker] = true;
        IGovernance(governance).slash(address(this), locker, bonds[locker][address(this)]);
    }
    

    /**
     * @notice Get the number of tokens `spender` is approved to spend on behalf of `account`
     * @param account The address of the account holding the funds
     * @param spender The address of the account spending the funds
     * @return The number of tokens approved
     */
    function allowance(address account, address spender) external view returns (uint) {
        return allowances[account][spender];
    }

    /**
     * @notice Approve `spender` to transfer up to `amount` from `src`
     * @dev This will overwrite the approval amount for `spender`
     *  and is subject to issues noted [here](https://eips.ethereum.org/EIPS/eip-20#approve)
     * @param spender The address of the account which may transfer tokens
     * @param amount The number of tokens that are approved (2^256-1 means infinite)
     * @return Whether or not the approval succeeded
     */
    function approve(address spender, uint amount) public returns (bool) {
        allowances[msg.sender][spender] = amount;

        emit Approval(msg.sender, spender, amount);
        return true;
    }
    
    /**
     * @notice Approve `spender` to transfer Locker rights
     * @param spender The address of the account which may transfer locker rights
     * @param fAllow whether this spender should be able to transfer rights
     * @return Whether or not the approval succeeded
     */
    function lockerightapprove(address spender,address bonding,bool fAllow) public returns (bool) {
        LockerAllowances[msg.sender][spender][bonding] = fAllow;

        emit LockerRightApproval(msg.sender, bonding,spender, fAllow);
        return true;
    }

    /**
     * @notice Triggers an approval from owner to spends
     * @param owner The address to approve from
     * @param spender The address to be approved
     * @param amount The number of tokens that are approved (2^256-1 means infinite)
     * @param deadline The time at which to expire the signature
     * @param v The recovery byte of the signature
     * @param r Half of the ECDSA signature pair
     * @param s Half of the ECDSA signature pair
     */
    function permit(address owner, address spender, uint amount, uint deadline, uint8 v, bytes32 r, bytes32 s) external {
        bytes32 structHash = keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, amount, nonces[owner]++, deadline));
        bytes32 digest = keccak256(abi.encodePacked("\x19\x01", DOMAINSEPARATOR, structHash));
        address signatory = ecrecover(digest, v, r, s);
        require(signatory != address(0), "permit: signature");
        require(signatory == owner, "permit: unauthorized");
        require(now <= deadline, "permit: expired");

        allowances[owner][spender] = amount;

        emit Approval(owner, spender, amount);
    }

    /**
     * @notice Get the number of tokens held by the `account`
     * @param account The address of the account to get the balance of
     * @return The number of tokens held
     */
    function balanceOf(address account) external view returns (uint) {
        return balances[account];
    }

    /**
     * @notice Transfer `amount` tokens from `msg.sender` to `dst`
     * @param dst The address of the destination account
     * @param amount The number of tokens to transfer
     * @return Whether or not the transfer succeeded
     */
    function transfer(address dst, uint amount) public returns (bool) {
        _transferTokens(msg.sender, dst, amount);
        return true;
    }

    /**
     * @notice Transfer `amount` tokens from `src` to `dst`
     * @param src The address of the source account
     * @param dst The address of the destination account
     * @param amount The number of tokens to transfer
     * @return Whether or not the transfer succeeded
     */
    function transferFrom(address src, address dst, uint amount) external returns (bool) {
        address spender = msg.sender;
        uint spenderAllowance = allowances[src][spender];

        if (spender != src && spenderAllowance != uint(-1)) {
            uint newAllowance = spenderAllowance.sub(amount, "transferFrom: exceeds spender allowance");
            allowances[src][spender] = newAllowance;

            emit Approval(src, spender, newAllowance);
        }

        _transferTokens(src, dst, amount);
        return true;
    }

    function _transferTokens(address src, address dst, uint amount) internal {
        require(src != address(0), "_transferTokens: zero address");
        require(dst != address(0), "_transferTokens: zero address");

        balances[src] = balances[src].sub(amount, "_transferTokens: exceeds balance");
        balances[dst] = balances[dst].add(amount, "_transferTokens: overflows");
        emit Transfer(src, dst, amount);
    }

    function _getChainId() internal pure returns (uint) {
        uint chainId;
        assembly { chainId := chainid() }
        return chainId;
    }
}

{
  "compilationTarget": {
    "Lock3r.sol": "Lock3r"
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}