Contract 0x4f3b253c3890076d8762e72bc79088a52511de5d 2

 
 
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Contract Source Code Verified (Exact Match)

Contract Name:
GameSessionManager

Compiler Version
v0.7.6+commit.7338295f

Optimization Enabled:
Yes with 2000 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at polygonscan.com on 2021-09-20
*/

// Sources flattened with hardhat v2.6.1 https://hardhat.org

// File contracts/math/Math.sol

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <=0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a >= b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow, so we distribute
        return (a / 2) + (b / 2) + ((a % 2 + b % 2) / 2);
    }
}


// File contracts/math/SafeMath.sol



pragma solidity >=0.6.0 <=0.8.0;

/**
 * @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, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, 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 (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

    /**
     * @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) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        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) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    /**
     * @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) {
        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, reverting 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) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting 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) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * 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);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * 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) {
        require(b > 0, errorMessage);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * 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;
    }
}


// File contracts/token/ERC20/IERC20.sol



pragma solidity >=0.7.6 <=0.8.0;

/**
 * @title ERC20 Token Standard, basic interface
 * @dev See https://eips.ethereum.org/EIPS/eip-20
 * Note: The ERC-165 identifier for this interface is 0x36372b07.
 */
interface IERC20 {
    /**
     * @dev Emitted when tokens are transferred, including zero value transfers.
     * @param _from The account where the transferred tokens are withdrawn from.
     * @param _to The account where the transferred tokens are deposited to.
     * @param _value The amount of tokens being transferred.
     */
    event Transfer(address indexed _from, address indexed _to, uint256 _value);

    /**
     * @dev Emitted when a successful call to {IERC20-approve(address,uint256)} is made.
     * @param _owner The account granting an allowance to `_spender`.
     * @param _spender The account being granted an allowance from `_owner`.
     * @param _value The allowance amount being granted.
     */
    event Approval(address indexed _owner, address indexed _spender, uint256 _value);

    /**
     * @notice Returns the total token supply.
     * @return The total token supply.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @notice Returns the account balance of another account with address `owner`.
     * @param owner The account whose balance will be returned.
     * @return The account balance of another account with address `owner`.
     */
    function balanceOf(address owner) external view returns (uint256);

    /**
     * Transfers `value` amount of tokens to address `to`.
     * @dev Reverts if `to` is the zero address.
     * @dev Reverts if the sender does not have enough balance.
     * @dev Emits an {IERC20-Transfer} event.
     * @dev Transfers of 0 values are treated as normal transfers and fire the {IERC20-Transfer} event.
     * @param to The receiver account.
     * @param value The amount of tokens to transfer.
     * @return True if the transfer succeeds, false otherwise.
     */
    function transfer(address to, uint256 value) external returns (bool);

    /**
     * @notice Transfers `value` amount of tokens from address `from` to address `to` via the approval mechanism.
     * @dev Reverts if `to` is the zero address.
     * @dev Reverts if the sender is not `from` and has not been approved by `from` for at least `value`.
     * @dev Reverts if `from` does not have at least `value` of balance.
     * @dev Emits an {IERC20-Transfer} event.
     * @dev Transfers of 0 values are treated as normal transfers and fire the {IERC20-Transfer} event.
     * @param from The emitter account.
     * @param to The receiver account.
     * @param value The amount of tokens to transfer.
     * @return True if the transfer succeeds, false otherwise.
     */
    function transferFrom(
        address from,
        address to,
        uint256 value
    ) external returns (bool);

    /**
     * Sets `value` as the allowance from the caller to `spender`.
     *  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
     * @dev Reverts if `spender` is the zero address.
     * @dev Emits the {IERC20-Approval} event.
     * @param spender The account being granted the allowance by the message caller.
     * @param value The allowance amount to grant.
     * @return True if the approval succeeds, false otherwise.
     */
    function approve(address spender, uint256 value) external returns (bool);

    /**
     * Returns the amount which `spender` is allowed to spend on behalf of `owner`.
     * @param owner The account that has granted an allowance to `spender`.
     * @param spender The account that was granted an allowance by `owner`.
     * @return The amount which `spender` is allowed to spend on behalf of `owner`.
     */
    function allowance(address owner, address spender) external view returns (uint256);
}


// File contracts/utils/Address.sol



pragma solidity >=0.6.2 <=0.8.0;

/**
 * @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) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @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].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}


// File contracts/token/ERC20/SafeERC20.sol



pragma solidity >=0.6.0 <=0.8.0;



/**
 * @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 IERC20;` 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));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    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: decreased allowance below zero");
        _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. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "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: ERC20 operation did not succeed");
        }
    }
}


// File contracts/metatx/ManagedIdentity.sol



pragma solidity >=0.7.6 <=0.8.0;

/*
 * 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.
 */
abstract contract ManagedIdentity {
    function _msgSender() internal view virtual returns (address payable) {
        return payable(msg.sender);
    }

    function _msgData() internal view virtual returns (bytes memory) {
        return msg.data;
    }
}


// File contracts/utils/Pausable.sol



pragma solidity >=0.7.6 <=0.8.0;

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is ManagedIdentity {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

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

    bool private _paused;

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

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

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

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

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

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


// File contracts/utils/access/IERC173.sol



pragma solidity >=0.7.6 <=0.8.0;

/**
 * @title ERC-173 Contract Ownership Standard
 * Note: the ERC-165 identifier for this interface is 0x7f5828d0
 */
interface IERC173 {
    /**
     * Event emited when ownership of a contract changes.
     * @param previousOwner the previous owner.
     * @param newOwner the new owner.
     */
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * Get the address of the owner
     * @return The address of the owner.
     */
    function owner() external view returns (address);

    /**
     * Set the address of the new owner of the contract
     * Set newOwner to address(0) to renounce any ownership.
     * @dev Emits an {OwnershipTransferred} event.
     * @param newOwner The address of the new owner of the contract. Using the zero address means renouncing ownership.
     */
    function transferOwnership(address newOwner) external;
}


// File contracts/utils/access/Ownable.sol



pragma solidity >=0.7.6 <=0.8.0;


/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is ManagedIdentity, IERC173 {
    address internal _owner;

    /**
     * Initializes the contract, setting the deployer as the initial owner.
     * @dev Emits an {IERC173-OwnershipTransferred(address,address)} event.
     */
    constructor(address owner_) {
        _owner = owner_;
        emit OwnershipTransferred(address(0), owner_);
    }

    /**
     * Gets the address of the current contract owner.
     */
    function owner() public view virtual override returns (address) {
        return _owner;
    }

    /**
     * See {IERC173-transferOwnership(address)}
     * @dev Reverts if the sender is not the current contract owner.
     * @param newOwner the address of the new owner. Use the zero address to renounce the ownership.
     */
    function transferOwnership(address newOwner) public virtual override {
        _requireOwnership(_msgSender());
        _owner = newOwner;
        emit OwnershipTransferred(_owner, newOwner);
    }

    /**
     * @dev Reverts if `account` is not the contract owner.
     * @param account the account to test.
     */
    function _requireOwnership(address account) internal virtual {
        require(account == this.owner(), "Ownable: not the owner");
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }
}


// File ethereum-universal-forwarder/src/solc_0.7/ERC2771/[email protected]


pragma solidity ^0.7.0;

abstract contract UsingAppendedCallData {
    function _lastAppendedDataAsSender() internal pure virtual returns (address payable sender) {
        // Copied from openzeppelin : https://github.com/OpenZeppelin/openzeppelin-contracts/blob/9d5f77db9da0604ce0b25148898a94ae2c20d70f/contracts/metatx/ERC2771Context.sol1
        // The assembly code is more direct than the Solidity version using `abi.decode`.
        // solhint-disable-next-line no-inline-assembly
        assembly {
            sender := shr(96, calldataload(sub(calldatasize(), 20)))
        }
    }

    function _msgDataAssuming20BytesAppendedData() internal pure virtual returns (bytes calldata) {
        return msg.data[:msg.data.length - 20];
    }
}


// File ethereum-universal-forwarder/src/solc_0.7/ERC2771/[email protected]


pragma solidity ^0.7.0;

interface IERC2771 {
    function isTrustedForwarder(address forwarder) external view returns (bool);
}


// File ethereum-universal-forwarder/src/solc_0.7/ERC2771/[email protected]


pragma solidity ^0.7.0;

interface IForwarderRegistry {
    function isForwarderFor(address, address) external view returns (bool);
}


// File ethereum-universal-forwarder/src/solc_0.7/ERC2771/[email protected]


pragma solidity ^0.7.0;



abstract contract UsingUniversalForwarding is UsingAppendedCallData, IERC2771 {
    IForwarderRegistry internal immutable _forwarderRegistry;
    address internal immutable _universalForwarder;

    constructor(IForwarderRegistry forwarderRegistry, address universalForwarder) {
        _universalForwarder = universalForwarder;
        _forwarderRegistry = forwarderRegistry;
    }

    function isTrustedForwarder(address forwarder) external view virtual override returns (bool) {
        return forwarder == _universalForwarder || forwarder == address(_forwarderRegistry);
    }

    function _msgSender() internal view virtual returns (address payable) {
        address payable msgSender = msg.sender;
        address payable sender = _lastAppendedDataAsSender();
        if (msgSender == address(_forwarderRegistry) || msgSender == _universalForwarder) {
            // if forwarder use appended data
            return sender;
        }

        // if msg.sender is neither the registry nor the universal forwarder,
        // we have to check the last 20bytes of the call data intepreted as an address
        // and check if the msg.sender was registered as forewarder for that address
        // we check tx.origin to save gas in case where msg.sender == tx.origin
        // solhint-disable-next-line avoid-tx-origin
        if (msgSender != tx.origin && _forwarderRegistry.isForwarderFor(sender, msgSender)) {
            return sender;
        }

        return msgSender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        address payable msgSender = msg.sender;
        if (msgSender == address(_forwarderRegistry) || msgSender == _universalForwarder) {
            // if forwarder use appended data
            return _msgDataAssuming20BytesAppendedData();
        }

        // we check tx.origin to save gas in case where msg.sender == tx.origin
        // solhint-disable-next-line avoid-tx-origin
        if (msgSender != tx.origin && _forwarderRegistry.isForwarderFor(_lastAppendedDataAsSender(), msgSender)) {
            return _msgDataAssuming20BytesAppendedData();
        }
        return msg.data;
    }
}


// File contracts/GameSessionManager.sol



pragma solidity >=0.7.6 <=0.8.0;


/**
 * @title GameSessionManager, a contract to register game sessions in GAMEE Arc8 app.
 */
contract GameSessionManager is  Ownable, Pausable, UsingUniversalForwarding {
    using SafeMath for uint256; 

    /**
     * Event emitted when a game session has been started.
     * @param user the address of the account which started mining Sesion.
     * @param sessionId the session identifier provided by the server.
     * @param sessionType the type of started session - tournament/battle   
     */
    event GameSessionStarted(address indexed user, string sessionId, uint256 sessionType);

    constructor(
        IForwarderRegistry forwarderRegistry,
        address universalForwarder
    ) UsingUniversalForwarding(forwarderRegistry, universalForwarder)  Ownable(msg.sender) {
    }

    function start(string calldata sessionId, uint256 sessionType) public whenNotPaused {

        emit GameSessionStarted(_msgSender(), sessionId, sessionType);
    }

    function pause() public onlyOwner {
        _pause();
    }

    function unpause() public onlyOwner {
        _unpause();
    }

    function _msgSender() internal view virtual override (ManagedIdentity, UsingUniversalForwarding) returns (address payable) {
        return UsingUniversalForwarding._msgSender();
    }

    function _msgData() internal view virtual override (ManagedIdentity, UsingUniversalForwarding) returns (bytes memory ret) {
        return UsingUniversalForwarding._msgData();
    }
}

Contract Security Audit

Contract ABI

[{"inputs":[{"internalType":"contract IForwarderRegistry","name":"forwarderRegistry","type":"address"},{"internalType":"address","name":"universalForwarder","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"string","name":"sessionId","type":"string"},{"indexed":false,"internalType":"uint256","name":"sessionType","type":"uint256"}],"name":"GameSessionStarted","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"Paused","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"Unpaused","type":"event"},{"inputs":[{"internalType":"address","name":"forwarder","type":"address"}],"name":"isTrustedForwarder","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"paused","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"string","name":"sessionId","type":"string"},{"internalType":"uint256","name":"sessionType","type":"uint256"}],"name":"start","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"unpause","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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000000000000000000e8f7fa0697b9b5edcbf3b6bf30040c75130e3297

Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

000000000000000000000000c5f6ac13b98f0e2b541c55c67a2c4946ae16d3f8000000000000000000000000e8f7fa0697b9b5edcbf3b6bf30040c75130e3297

-----Decoded View---------------
Arg [0] : forwarderRegistry (address): 0xc5f6ac13b98f0e2b541c55c67a2c4946ae16d3f8
Arg [1] : universalForwarder (address): 0xe8f7fa0697b9b5edcbf3b6bf30040c75130e3297

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000c5f6ac13b98f0e2b541c55c67a2c4946ae16d3f8
Arg [1] : 000000000000000000000000e8f7fa0697b9b5edcbf3b6bf30040c75130e3297


Deployed ByteCode Sourcemap

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Swarm Source

ipfs://f48a99072d0333af5d2061a05db8f0614a4008f39a5825e7b6a3ad06ae5400cd
Block Transaction Gas Used Reward
Age Block Fee Address BC Fee Address Voting Power Jailed Incoming
Block Uncle Number Difficulty Gas Used Reward
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