Contract 0xa7AcE3F7Fb11aA70dECa1469d79d474cD6691767

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Contract Source Code Verified (Exact Match)

Contract Name:
ERC721StakingModuleFactory

Compiler Version
v0.8.4+commit.c7e474f2

Optimization Enabled:
Yes with 1000 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity Standard Json-Input format)

File 1 of 9 : IERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

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

File 2 of 9 : IERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721
     * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must
     * understand this adds an external call which potentially creates a reentrancy vulnerability.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);
}

File 3 of 9 : IERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

File 4 of 9 : ERC721StakingModule.sol
/*
ERC721StakingModule

https://github.com/FanbaseEU/Staking_Ethereum_SmartContracts

SPDX-License-Identifier: MIT
*/

pragma solidity 0.8.4;

import "@openzeppelin/contracts/token/ERC721/IERC721.sol";

import "./interfaces/IStakingModule.sol";

/**
 * @title ERC721 staking module
 *
 * @notice this staking module allows users to deposit one or more ERC721
 * tokens in exchange for shares credited to their address. When the user
 * unstakes, these shares will be burned and a reward will be distributed.
 */
contract ERC721StakingModule is IStakingModule {
	// constant
	uint256 public constant SHARES_PER_TOKEN = 10**18;

	// members
	IERC721 private immutable _token;
	address public immutable _factory;

	mapping(address => uint256) public counts;
	mapping(uint256 => address) public owners;
	mapping(address => mapping(uint256 => uint256)) public tokenByOwner;
	mapping(uint256 => uint256) public tokenIndex;

	/**
	 * @param token_ the token that will be rewarded
	 */
	constructor(address token_, address factory_) {
		require(
			IERC165(token_).supportsInterface(0x80ac58cd),
			"Interface ID not matched"
		);
		_token = IERC721(token_);
		_factory = factory_;
	}

	/**
	 * @inheritdoc IStakingModule
	 */
	function tokens()
		external
		view
		override
		returns (address[] memory tokens_)
	{
		tokens_ = new address[](1);
		tokens_[0] = address(_token);
	}

	/**
	 * @inheritdoc IStakingModule
	 */
	function balances(address user)
		external
		view
		override
		returns (uint256[] memory balances_)
	{
		balances_ = new uint256[](1);
		balances_[0] = counts[user];
	}

	/**
	 * @inheritdoc IStakingModule
	 */
	function factory() external view override returns (address) {
		return _factory;
	}

	/**
	 * @inheritdoc IStakingModule
	 */
	function totals()
		external
		view
		override
		returns (uint256[] memory totals_)
	{
		totals_ = new uint256[](1);
		totals_[0] = _token.balanceOf(address(this));
	}

	/**
	 * @inheritdoc IStakingModule
	 */
	function stake(
		address user,
		uint256 amount,
		bytes calldata data
	) external override onlyOwner returns (address, uint256) {
		// validate
		require(amount > 0, "Staking amount must be greater than 0");
		require(amount <= _token.balanceOf(user), "Insufficient balance");
		require(data.length == 32 * amount, "Invalid calldata");

		uint256 count = counts[user];

		// stake
		for (uint256 i = 0; i < amount; i++) {
			// get token id
			uint256 id;
			uint256 pos = 132 + 32 * i;
			assembly {
				id := calldataload(pos)
			}

			// ownership mappings
			owners[id] = user;
			uint256 len = count + i;
			tokenByOwner[user][len] = id;
			tokenIndex[id] = len;

			// transfer to module
			_token.transferFrom(user, address(this), id);
		}

		// update position
		counts[user] = count + amount;

		// emit
		uint256 shares = amount * SHARES_PER_TOKEN;
		emit Staked(user, address(_token), amount, shares);

		return (user, shares);
	}

	/**
	 * @inheritdoc IStakingModule
	 */
	function unstake(
		address user,
		uint256 amount,
		bytes calldata data
	) external override onlyOwner returns (address, uint256) {
		// validate
		require(amount > 0, "Unstaking amount must be greater than 0");
		uint256 count = counts[user];
		require(amount <= count, "Insufficient staked balance");
		require(data.length == 32 * amount, "Invalid calldata");

		// unstake
		for (uint256 i = 0; i < amount; i++) {
			// get token id
			uint256 id;
			uint256 pos = 132 + 32 * i;
			assembly {
				id := calldataload(pos)
			}

			// ownership
			require(owners[id] == user, "Only owner can unstake");
			delete owners[id];

			// clean up ownership mappings
			uint256 lastIndex = count - 1 - i;
			if (amount != count) {
				// reindex on partial unstake
				uint256 index = tokenIndex[id];
				if (index != lastIndex) {
					uint256 lastId = tokenByOwner[user][lastIndex];
					tokenByOwner[user][index] = lastId;
					tokenIndex[lastId] = index;
				}
			}
			delete tokenByOwner[user][lastIndex];
			delete tokenIndex[id];

			// transfer to user
			_token.safeTransferFrom(address(this), user, id);
		}

		// update position
		counts[user] = count - amount;

		// emit
		uint256 shares = amount * SHARES_PER_TOKEN;
		emit Unstaked(user, address(_token), amount, shares);

		return (user, shares);
	}

	/**
	 * @inheritdoc IStakingModule
	 */
	function claim(
		address user,
		uint256 amount,
		bytes calldata
	) external override onlyOwner returns (address, uint256) {
		// validate
		require(amount > 0, "Claiming amount must be greater than 0");
		require(amount <= counts[user], "Insufficient balance");

		uint256 shares = amount * SHARES_PER_TOKEN;
		emit Claimed(user, address(_token), amount, shares);
		return (user, shares);
	}

	/**
	 * @inheritdoc IStakingModule
	 */
	function update(address) external override {}

	/**
	 * @inheritdoc IStakingModule
	 */
	function clean() external override {}
}

File 5 of 9 : ERC721StakingModuleFactory.sol
/*
ERC721StakingModuleFactory

https://github.com/FanbaseEU/Staking_Ethereum_SmartContracts

SPDX-License-Identifier: MIT
*/

pragma solidity 0.8.4;

import "./interfaces/IModuleFactory.sol";
import "./ERC721StakingModule.sol";

/**
 * @title ERC721 staking module factory
 *
 * @notice this factory contract handles deployment for the
 * ERC721StakingModule contract
 *
 * @dev it is called by the parent PoolFactory and is responsible
 * for parsing constructor arguments before creating a new contract
 */
contract ERC721StakingModuleFactory is IModuleFactory {
    /**
     * @inheritdoc IModuleFactory
     */
    function createModule(bytes calldata data)
        external
        override
        returns (address)
    {
        // validate
        require(data.length == 32, "Invalid calldata");

        // parse staking token
        address token;
        assembly {
            token := calldataload(68)
        }

        // create module
        ERC721StakingModule module =
            new ERC721StakingModule(token, address(this));
        module.transferOwnership(msg.sender);

        // output
        emit ModuleCreated(msg.sender, address(module));
        return address(module);
    }
}

File 6 of 9 : IEvents.sol
/*
IEvents

https://github.com/FanbaseEU/Staking_Ethereum_SmartContracts

SPDX-License-Identifier: MIT
 */

pragma solidity 0.8.4;

/**
 * @title GYSR event system
 *
 * @notice common interface to define GYSR event system
 */
interface IEvents {
    // staking
    event Staked(
        address indexed user,
        address indexed token,
        uint256 amount,
        uint256 shares
    );
    event Unstaked(
        address indexed user,
        address indexed token,
        uint256 amount,
        uint256 shares
    );
    event Claimed(
        address indexed user,
        address indexed token,
        uint256 amount,
        uint256 shares
    );

    // rewards
    event RewardsDistributed(
        address indexed user,
        address indexed token,
        uint256 amount,
        uint256 shares
    );
    event RewardsFunded(
        address indexed token,
        uint256 amount,
        uint256 shares,
        uint256 timestamp
    );
    event RewardsUnlocked(address indexed token, uint256 shares);
    event RewardsExpired(
        address indexed token,
        uint256 amount,
        uint256 shares,
        uint256 timestamp
    );

    // gysr
    event GysrSpent(address indexed user, uint256 amount);
    event GysrVested(address indexed user, uint256 amount);
    event GysrWithdrawn(uint256 amount);
}

File 7 of 9 : IModuleFactory.sol
/*
IModuleFactory

https://github.com/FanbaseEU/Staking_Ethereum_SmartContracts

SPDX-License-Identifier: MIT
*/

pragma solidity 0.8.4;

/**
 * @title Module factory interface
 *
 * @notice this defines the common module factory interface used by the
 * main factory to create the staking and reward modules for a new Pool.
 */
interface IModuleFactory {
    // events
    event ModuleCreated(address indexed user, address module);

    /**
     * @notice create a new Pool module
     * @param data binary encoded construction parameters
     * @return address of newly created module
     */
    function createModule(bytes calldata data) external returns (address);
}

File 8 of 9 : IStakingModule.sol
/*
IStakingModule

https://github.com/FanbaseEU/Staking_Ethereum_SmartContracts

SPDX-License-Identifier: MIT
*/

pragma solidity 0.8.4;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

import "./IEvents.sol";

import "../OwnerController.sol";

/**
 * @title Staking module interface
 *
 * @notice this contract defines the common interface that any staking module
 * must implement to be compatible with the modular Pool architecture.
 */
abstract contract IStakingModule is OwnerController, IEvents {
    // constants
    uint256 public constant DECIMALS = 18;

    /**
     * @return array of staking tokens
     */
    function tokens() external view virtual returns (address[] memory);

    /**
     * @notice get balance of user
     * @param user address of user
     * @return balances of each staking token
     */
    function balances(address user)
        external
        view
        virtual
        returns (uint256[] memory);

    /**
     * @return address of module factory
     */
    function factory() external view virtual returns (address);

    /**
     * @notice get total staked amount
     * @return totals for each staking token
     */
    function totals() external view virtual returns (uint256[] memory);

    /**
     * @notice stake an amount of tokens for user
     * @param user address of user
     * @param amount number of tokens to stake
     * @param data additional data
     * @return address of staking account
     * @return number of shares minted for stake
     */
    function stake(
        address user,
        uint256 amount,
        bytes calldata data
    ) external virtual returns (address, uint256);

    /**
     * @notice unstake an amount of tokens for user
     * @param user address of user
     * @param amount number of tokens to unstake
     * @param data additional data
     * @return address of staking account
     * @return number of shares burned for unstake
     */
    function unstake(
        address user,
        uint256 amount,
        bytes calldata data
    ) external virtual returns (address, uint256);

    /**
     * @notice quote the share value for an amount of tokens without unstaking
     * @param user address of user
     * @param amount number of tokens to claim with
     * @param data additional data
     * @return address of staking account
     * @return number of shares that the claim amount is worth
     */
    function claim(
        address user,
        uint256 amount,
        bytes calldata data
    ) external virtual returns (address, uint256);

    /**
     * @notice method called by anyone to update accounting
     * @param user address of user for update
     * @dev will only be called ad hoc and should not contain essential logic
     */
    function update(address user) external virtual;

    /**
     * @notice method called by owner to clean up and perform additional accounting
     * @dev will only be called ad hoc and should not contain any essential logic
     */
    function clean() external virtual;
}

File 9 of 9 : OwnerController.sol
/*
OwnerController

https://github.com/FanbaseEU/Staking_Ethereum_SmartContracts

SPDX-License-Identifier: MIT
*/

pragma solidity 0.8.4;

/**
 * @title Owner controller
 *
 * @notice this base contract implements an owner-controller access model.
 *
 * @dev the contract is an adapted version of the OpenZeppelin Ownable contract.
 * It allows the owner to designate an additional account as the controller to
 * perform restricted operations.
 *
 * Other changes include supporting role verification with a require method
 * in addition to the modifier option, and removing some unneeded functionality.
 *
 * Original contract here:
 * https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/access/Ownable.sol
 */
contract OwnerController {
    address private _owner;
    address private _controller;

    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );

    event ControlTransferred(
        address indexed previousController,
        address indexed newController
    );

    constructor() {
        _owner = msg.sender;
        _controller = msg.sender;
        emit OwnershipTransferred(address(0), _owner);
        emit ControlTransferred(address(0), _owner);
    }

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

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

    /**
     * @dev Modifier that throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(_owner == msg.sender, "Only owner can perform this action");
        _;
    }

    /**
     * @dev Modifier that throws if called by any account other than the controller.
     */
    modifier onlyController() {
        require(_controller == msg.sender, "Only controller can perform this action");
        _;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    function requireOwner() internal view {
        require(_owner == msg.sender, "Only owner can perform this action");
    }

    /**
     * @dev Throws if called by any account other than the controller.
     */
    function requireController() internal view {
        require(_controller == msg.sender, "Only controller can perform this action");
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`). This can
     * include renouncing ownership by transferring to the zero address.
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual {
        requireOwner();
        require(newOwner != address(0), "New owner address can't be zero");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }

    /**
     * @dev Transfers control of the contract to a new account (`newController`).
     * Can only be called by the owner.
     */
    function transferControl(address newController) public virtual {
        requireOwner();
        require(newController != address(0), "New controller address can't be zero");
        emit ControlTransferred(_controller, newController);
        _controller = newController;
    }
}

Settings
{
  "optimizer": {
    "enabled": true,
    "runs": 1000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

Contract ABI

[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"address","name":"module","type":"address"}],"name":"ModuleCreated","type":"event"},{"inputs":[{"internalType":"bytes","name":"data","type":"bytes"}],"name":"createModule","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"nonpayable","type":"function"}]

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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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