/**
*Submitted for verification at Etherscan.io on 2020-11-18
*/
pragma solidity ^0.7.5;
/**
* @dev Wrappers over Solidity's arithmetic operations with added overflow
* checks.
*
* Arithmetic operations in Solidity wrap on overflow. This can easily result
* in bugs, because programmers usually assume that an overflow raises an
* error, which is the standard behavior in high level programming languages.
* `SafeMath` restores this intuition by reverting the transaction when an
* operation overflows.
*
* Using this library instead of the unchecked operations eliminates an entire
* class of bugs, so it's recommended to use it always.
*/
library SafeMath {
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
* - Addition cannot overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
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");
uint256 c = a - b;
return c;
}
/**
* @dev Returns the multiplication of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `*` operator.
*
* Requirements:
* - Multiplication cannot overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
if (a == 0) {
return 0;
}
uint256 c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
return c;
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
// Solidity only automatically asserts when dividing by 0
require(b > 0, "SafeMath: division by zero");
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
require(b != 0, "SafeMath: modulo by zero");
return a % b;
}
}
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// SPDX-License-Identifier: CC0-1.0
// This interface is designed to be compatible with the Vyper version.
/// @notice This is the Ethereum 2.0 deposit contract interface.
/// For more information see the Phase 0 specification under https://github.com/ethereum/eth2.0-specs
interface IDepositContract {
/// @notice A processed deposit event.
event DepositEvent(
bytes pubkey,
bytes withdrawal_credentials,
bytes amount,
bytes signature,
bytes index
);
/// @notice Submit a Phase 0 DepositData object.
/// @param pubkey A BLS12-381 public key.
/// @param withdrawal_credentials Commitment to a public key for withdrawals.
/// @param signature A BLS12-381 signature.
/// @param deposit_data_root The SHA-256 hash of the SSZ-encoded DepositData object.
/// Used as a protection against malformed input.
function deposit(
bytes calldata pubkey,
bytes calldata withdrawal_credentials,
bytes calldata signature,
bytes32 deposit_data_root
) external payable;
/// @notice Query the current deposit root hash.
/// @return The deposit root hash.
function get_deposit_root() external view returns (bytes32);
/// @notice Query the current deposit count.
/// @return The deposit count encoded as a little endian 64-bit number.
function get_deposit_count() external view returns (bytes memory);
}
/**
* @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.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be aplied to your functions to restrict their use to
* the owner.
*/
contract Ownable {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor () {
_owner = msg.sender;
emit OwnershipTransferred(address(0), _owner);
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view returns (address) {
return _owner;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(isOwner(), "Ownable: caller is not the owner");
_;
}
/**
* @dev Returns true if the caller is the current owner.
*/
function isOwner() public view returns (bool) {
return msg.sender == _owner;
}
/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions anymore. Can only be called by the current owner.
*
* > Note: Renouncing ownership will leave the contract without an owner,
* thereby removing any functionality that is only available to the owner.
*/
function renounceOwnership() public onlyOwner {
emit OwnershipTransferred(_owner, address(0));
_owner = address(0);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) public onlyOwner {
_transferOwnership(newOwner);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
*/
function _transferOwnership(address newOwner) internal {
require(newOwner != address(0), "Ownable: new owner is the zero address");
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
}
/**
* @title Pausable
* @dev Base contract which allows children to implement an emergency stop mechanism.
* from https://github.com/FriendlyUser/solidity-smart-contracts//blob/v0.2.0/contracts/other/CredVert/Pausable.sol
*/
contract Pausable is Ownable {
event Pause();
event Unpause();
bool public paused = false;
/**
* @dev Modifier to make a function callable only when the contract is not paused.
*/
modifier whenNotPaused() {
require(!paused, "Pausable: Contract is paused and requires !paused");
_;
}
/**
* @dev Modifier to make a function callable only when the contract is paused.
*/
modifier whenPaused() {
require(paused, "Pausable: Contract is not paused but requires paused");
_;
}
/**
* @dev called by the owner to pause, triggers stopped state
*/
function pause() public onlyOwner whenNotPaused {
paused = true;
emit Pause();
}
/**
* @dev called by the owner to unpause, returns to normal state
*/
function unpause() public onlyOwner whenPaused {
paused = false;
emit Unpause();
}
}
interface ISharedDeposit {
function donate(uint shares) payable external;
}
interface IBETH {
function setMinter(address minter_) external;
/**
* @notice Mint new tokens
* @param dst The address of the destination account
* @param rawAmount The number of tokens to be minted
*/
function mint(address dst, uint rawAmount) external;
function burn(address src, uint rawAmount) external;
function mintingAllowedAfter() external view returns (uint);
/**
* @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);
/**
* @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 rawAmount The number of tokens that are approved (2^256-1 means infinite)
* @return Whether or not the approval succeeded
*/
function approve(address spender, uint rawAmount) external returns (bool);
/**
* @notice Triggers an approval from owner to spends
* @param owner The address to approve from
* @param spender The address to be approved
* @param rawAmount 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 rawAmount, uint deadline, uint8 v, bytes32 r, bytes32 s) external;
/**
* @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);
/**
* @notice Transfer `amount` tokens from `msg.sender` to `dst`
* @param dst The address of the destination account
* @param rawAmount The number of tokens to transfer
* @return Whether or not the transfer succeeded
*/
function transfer(address dst, uint rawAmount) external returns (bool);
/**
* @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 rawAmount The number of tokens to transfer
* @return Whether or not the transfer succeeded
*/
function transferFrom(address src, address dst, uint rawAmount) external returns (bool);
}
/**
* @dev Contract module that helps prevent reentrant calls to a function.
*
* Inheriting from `ReentrancyGuard` will make the `nonReentrant` modifier
* available, which can be aplied 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.
*/
contract ReentrancyGuard {
/// @dev counter to allow mutex lock with only one SSTORE operation
uint256 private _guardCounter;
constructor () {
// The counter starts at one to prevent changing it from zero to a non-zero
// value, which is a more expensive operation.
_guardCounter = 1;
}
/**
* @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() {
_guardCounter += 1;
uint256 localCounter = _guardCounter;
_;
require(localCounter == _guardCounter, "ReentrancyGuard: reentrant call");
}
}
contract SharedDeposit is Pausable, ReentrancyGuard {
using SafeMath for uint256;
using SafeMath for uint;
/* ========== STATE VARIABLES ========== */
address public mainnetDepositContractAddress = 0x00000000219ab540356cBB839Cbe05303d7705Fa;
IDepositContract depositContract;
uint256 public adminFee;
uint256 public numValidators;
uint256 public costPerValidator;
uint256 public curValidatorShares;
uint256 public validatorsCreated;
uint256 public adminFeeTotal;
bool public disableWithdrawRefund;
// Its hard to exactly hit the max deposit amount with small shares. this allows a small bit of overflow room
// Eth in the buffer cannot be withdrawn by an admin, only by burning the underlying token via a user withdraw
uint256 public buffer;
address public BETHTokenAddress;
IBETH BETHToken;
constructor(uint256 _numValidators, uint256 _adminFee, address _BETHTokenAddress) public {
depositContract = IDepositContract(mainnetDepositContractAddress);
adminFee = _adminFee; // Admin and infra fees
numValidators = _numValidators; // The number of validators to create in this lot. Enough ETH for this many are needed before transfer to eth2
// Eth in the buffer cannot be withdrawn by an admin, only by burning the underlying token
buffer = uint(10).mul(1e18); // roughly equal to 10 eth.
curValidatorShares = 0; // The validator shares created by this shared stake contract. 1 share costs >= 1 eth
validatorsCreated = 0; // The number of times the deposit to eth2 contract has been called to create validators
adminFeeTotal = 0; // Total accrued admin fee
disableWithdrawRefund = false; // Flash loan tokenomic protection in case of changes in admin fee with future lots
BETHTokenAddress = _BETHTokenAddress;
BETHToken = IBETH(BETHTokenAddress);
costPerValidator = uint(32).mul(1e18).add(adminFee);
}
// VIEW FUNCTIONS
function mintingAllowedAfter() external view returns (uint256) {
return BETHToken.mintingAllowedAfter();
}
function workable() public view returns (bool) {
// similiar to workable on KP3R contracts
// used to check if we can call deposit to eth2
uint256 amount = 32 ether;
bool validatorLimitReached = (curValidatorShares >= maxValidatorShares());
bool balanceEnough = (address(this).balance >= amount);
return validatorLimitReached && balanceEnough;
}
function maxValidatorShares() public view returns (uint256) {
return uint(32).mul(1e18).mul(numValidators);
}
function remainingSpaceInEpoch() external view returns (uint256) {
// Helpful view function to gauge how much the user can send to the contract when it is near full
uint remainingShares = (maxValidatorShares()).sub(curValidatorShares);
uint valBeforeAdmin = remainingShares.mul(1e18).div(uint(1).mul(1e18).sub(adminFee.mul(1e18).div(costPerValidator)));
return valBeforeAdmin;
}
// USER INTERACTIONS
/*
Shares minted = Z
Principal deposit input = P
AdminFee = a
AdminFee as percent in 1e18 = a% = a / 32
AdminFee on tx in 1e18 = (P * a% / 1e18)
on deposit:
P - (P * a%) = Z
on withdraw with admin fee refund:
P = Z / (1 - a%)
*/
function deposit() public payable nonReentrant whenNotPaused {
// input is whole, not / 1e18 , i.e. in 1 = 1 eth send when from etherscan
uint value = uint(msg.value);
uint myAdminFee = adminFee.mul(value).mul(1e18).div(costPerValidator).div(1e18);
uint valMinusAdmin = value.sub(myAdminFee);
uint newShareTotal = curValidatorShares.add(valMinusAdmin);
require(newShareTotal <= buffer.add(maxValidatorShares()), "Eth2Staker:deposit:Amount too large, not enough validators left");
curValidatorShares = newShareTotal;
adminFeeTotal = adminFeeTotal.add(myAdminFee);
BETHToken.mint(msg.sender, valMinusAdmin);
}
function withdraw(uint256 amount) public nonReentrant whenNotPaused {
uint valBeforeAdmin = amount.mul(1e18).div(uint(1).mul(1e18).sub(adminFee.mul(1e18).div(costPerValidator)));
if (disableWithdrawRefund == true) {
valBeforeAdmin = amount;
}
uint newShareTotal = curValidatorShares.sub(amount);
require(newShareTotal <= buffer.add(maxValidatorShares()), "Eth2Staker:withdraw:Amount too large, not enough validators supplied");
require(newShareTotal >= 0, "Eth2Staker:withdraw:Amount too small, not enough validators left");
require(address(this).balance > amount, "Eth2Staker:withdraw:not enough balancce in contract");
require(BETHToken.balanceOf(msg.sender) >= amount, "Eth2Staker: Sender balance not enough");
curValidatorShares = newShareTotal;
adminFeeTotal = adminFeeTotal.sub(valBeforeAdmin.sub(amount));
BETHToken.burn(msg.sender, amount);
address payable sender = msg.sender;
sender.transfer(valBeforeAdmin);
}
// migration function to accept old monies and copy over state
// users should not use this as it just donates the money without minting veth or tracking donations
function donate(uint shares) external payable nonReentrant {
curValidatorShares = shares;
}
// OWNER ONLY FUNCTIONS
// This needs to be called once per validator
function depositToEth2(bytes calldata pubkey,
bytes calldata withdrawal_credentials,
bytes calldata signature,
bytes32 deposit_data_root) external onlyOwner nonReentrant {
uint256 amount = 32 ether;
require(address(this).balance >= amount, "Eth2Staker:depositToEth2: Not enough balance"); //need at least 32 ETH
depositContract.deposit{value: amount}(pubkey, withdrawal_credentials, signature, deposit_data_root);
validatorsCreated = validatorsCreated.add(1);
}
function setNumValidators(uint256 _numValidators) external onlyOwner {
numValidators = _numValidators;
}
function toggleWithdrawAdminFeeRefund() external onlyOwner {
// in case the pool of tokens gets too large it will attract flash loans if the price of the pool token dips below x-admin fee
// in that case or if the admin fee changes in cases of 1k+ validators
// we may need to disable the withdraw refund
// We also need to toggle this on if post migration we want to allow users to withdraw funds
disableWithdrawRefund = !disableWithdrawRefund;
}
// Recover ownership of token supply and mint for upgrading the contract
// When we want to upgrade this contract the plan is to:
// - Limit the num validators. This disables deposits when the limit is reached
// - Create the set of validators trasfering contract value to eth2
// - Migrate the minter to a new contract
// - migrate dust in the buffer to the new contract
function setMinter(address payable minter_) external onlyOwner nonReentrant {
BETHToken.setMinter(minter_);
uint amount = address(this).balance;
ISharedDeposit newContract = ISharedDeposit(minter_);
if (amount > 0) {
newContract.donate{value: amount}(curValidatorShares);
}
}
function setAdminFee(uint256 amount) external onlyOwner {
adminFee = amount;
costPerValidator = uint(32).mul(1e18).add(adminFee);
}
function withdrawAdminFee(uint amount) external onlyOwner nonReentrant {
require(validatorsCreated >= 0, "Eth2Staker:withdrawAdminFee: No validators created. Admins cannot withdraw without creation");
address payable sender = msg.sender;
if (amount == 0) {
amount = adminFeeTotal;
}
require(amount <= adminFeeTotal, "Eth2Staker:withdrawAdminFee: More than adminFeeTotal cannot be withdrawn");
sender.transfer(amount);
adminFeeTotal = adminFeeTotal.sub(amount);
}
}
{
"compilationTarget": {
"browser/sharedStake_mainnet.sol": "SharedDeposit"
},
"evmVersion": "istanbul",
"libraries": {},
"metadata": {
"bytecodeHash": "ipfs"
},
"optimizer": {
"enabled": true,
"runs": 200
},
"remappings": []
}
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