Contract Overview
Contract Name:
IOTXStaking
Compiler Version
v0.8.9+commit.e5eed63a
// File: @openzeppelin/contracts/utils/introspection/IERC165.sol
// 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: @openzeppelin/contracts/token/ERC721/IERC721.sol
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC721/IERC721.sol)
pragma solidity ^0.8.0;
/**
* @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: interfaces/ISystemStaking.sol
/*
* ==================================================================
* Copyright (C) 2023 Altstake Technology Pte. Ltd. (RockX)
* This code is free software; you can redistribute it
* and/or modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 3 of the License,
* or (at your option) any later version.
* This code is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License.
* If not, see <http://www.gnu.org/licenses/>
* ==================================================================
*/
pragma solidity ^0.8.9;
// @notice This is the IoTeX system contract interface. It issues an NFT token for each bucket creation.
// For more information see https://github.com/iotexproject/iip13-contracts/blob/main/src/SystemStaking.sol
interface ISystemStaking is IERC721 {
function isActiveBucketType(uint256 _amount, uint256 _duration) external view returns (bool);
function bucketOf(uint _tokenId) external view returns ( uint amount_, uint duration_, uint unlockedAt_, uint unstakedAt_, address delegate_);
function stake(uint _amount, uint _duration, address _delegate, uint _count) external payable returns (uint firstTokenId_);
function unlock(uint[] calldata _tokenIds) external;
function unstake(uint[] calldata _tokenIds) external;
function withdraw( uint[] calldata _tokenIds, address payable _recipient) external;
function merge(uint[] calldata tokenIds, uint _newDuration) external payable;
function changeDelegates(uint[] calldata _tokenIds, address _delegate) external;
}
// File: @openzeppelin/contracts/token/ERC20/IERC20.sol
// OpenZeppelin Contracts (last updated v4.9.0) (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: interfaces/IUniIOTX.sol
/*
* ==================================================================
* Copyright (C) 2023 Altstake Technology Pte. Ltd. (RockX)
* This code is free software; you can redistribute it
* and/or modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 3 of the License,
* or (at your option) any later version.
* This code is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License.
* If not, see <http://www.gnu.org/licenses/>
* ==================================================================
*/
pragma solidity ^0.8.9;
interface IUniIOTX is IERC20 {
function mint(address account, uint amount) external;
function burn(uint amount) external;
function burnFrom(address account, uint256 amount) external;
function batchTransfer(address[] memory recipients, uint256[] memory amounts) external;
}
// File: @openzeppelin/contracts/token/ERC721/IERC721Receiver.sol
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol)
pragma solidity ^0.8.0;
/**
* @title ERC721 token receiver interface
* @dev Interface for any contract that wants to support safeTransfers
* from ERC721 asset contracts.
*/
interface IERC721Receiver {
/**
* @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
* by `operator` from `from`, this function is called.
*
* It must return its Solidity selector to confirm the token transfer.
* If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
*
* The selector can be obtained in Solidity with `IERC721Receiver.onERC721Received.selector`.
*/
function onERC721Received(
address operator,
address from,
uint256 tokenId,
bytes calldata data
) external returns (bytes4);
}
// File: interfaces/IIOTXStaking.sol
/*
* ==================================================================
* Copyright (C) 2023 Altstake Technology Pte. Ltd. (RockX)
* This code is free software; you can redistribute it
* and/or modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 3 of the License,
* or (at your option) any later version.
* This code is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License.
* If not, see <http://www.gnu.org/licenses/>
* ==================================================================
*/
pragma solidity ^0.8.9;
interface IIOTXStaking is IERC721Receiver {
function exchangeRatio() external returns (uint ratio);
function currentReserve() external view returns(uint);
function redeemAmountBase() external returns(uint);
function getRedeemedTokenIdSlice(uint i, uint j) external view returns (uint[] memory tokenIds);
function getStakedTokenCount(uint tokenQueueIndex) external view returns (uint count);
function setGlobalDelegate(address delegate) external;
function updateDelegates(uint[] calldata tokenIds, address delegate) external;
function deposit(uint deadline) external payable returns (uint minted);
function stake() external;
function redeem(uint iotxsToRedeem, uint deadline) external returns (uint burned);
function updateReward() external;
function withdrawManagerFee(uint amount, address recipient) external;
}
// File: interfaces/IIOTXClear.sol
/*
* ==================================================================
* Copyright (C) 2023 Altstake Technology Pte. Ltd. (RockX)
* This code is free software; you can redistribute it
* and/or modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 3 of the License,
* or (at your option) any later version.
* This code is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License.
* If not, see <http://www.gnu.org/licenses/>
* ==================================================================
*/
pragma solidity ^0.8.9;
interface IIOTXClear is IERC721Receiver {
function updateDelegates(uint[] calldata tokenIds, address delegate) external;
function getReward(address acount) external returns (uint);
function joinDebt(address claimAddr, uint amount) external;
function unstake(uint[] calldata tokenIds) external;
function payDebts(uint[] calldata tokenIds) external;
function claimRewards(uint amount, address recipient) external;
function claimPrincipals(uint amount, address recipient) external;
function claim(uint amount, address recipient) external;
}
// File: interfaces/Roles.sol
/*
* ==================================================================
* Copyright (C) 2023 Altstake Technology Pte. Ltd. (RockX)
* This code is free software; you can redistribute it
* and/or modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 3 of the License,
* or (at your option) any later version.
* This code is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License.
* If not, see <http://www.gnu.org/licenses/>
* ==================================================================
*/
pragma solidity ^0.8.9;
// Roles
bytes32 constant ROLE_PAUSER = keccak256("ROLE_PAUSER");
bytes32 constant ROLE_MINTER = keccak256("ROLE_MINTER");
bytes32 constant ROLE_STAKER = keccak256("ROLE_STAKER");
bytes32 constant ROLE_FEE_MANAGER = keccak256("ROLE_FEE_MANAGER");
bytes32 constant ROLE_ORACLE = keccak256("ROLE_ORACLE");
// File: @openzeppelin/contracts-upgradeable/utils/introspection/IERC165Upgradeable.sol
// 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 IERC165Upgradeable {
/**
* @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: @openzeppelin/contracts-upgradeable/utils/math/SignedMathUpgradeable.sol
// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/SignedMath.sol)
pragma solidity ^0.8.0;
/**
* @dev Standard signed math utilities missing in the Solidity language.
*/
library SignedMathUpgradeable {
/**
* @dev Returns the largest of two signed numbers.
*/
function max(int256 a, int256 b) internal pure returns (int256) {
return a > b ? a : b;
}
/**
* @dev Returns the smallest of two signed numbers.
*/
function min(int256 a, int256 b) internal pure returns (int256) {
return a < b ? a : b;
}
/**
* @dev Returns the average of two signed numbers without overflow.
* The result is rounded towards zero.
*/
function average(int256 a, int256 b) internal pure returns (int256) {
// Formula from the book "Hacker's Delight"
int256 x = (a & b) + ((a ^ b) >> 1);
return x + (int256(uint256(x) >> 255) & (a ^ b));
}
/**
* @dev Returns the absolute unsigned value of a signed value.
*/
function abs(int256 n) internal pure returns (uint256) {
unchecked {
// must be unchecked in order to support `n = type(int256).min`
return uint256(n >= 0 ? n : -n);
}
}
}
// File: @openzeppelin/contracts-upgradeable/utils/math/MathUpgradeable.sol
// OpenZeppelin Contracts (last updated v4.9.0) (utils/math/Math.sol)
pragma solidity ^0.8.0;
/**
* @dev Standard math utilities missing in the Solidity language.
*/
library MathUpgradeable {
enum Rounding {
Down, // Toward negative infinity
Up, // Toward infinity
Zero // Toward zero
}
/**
* @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.
return (a & b) + (a ^ b) / 2;
}
/**
* @dev Returns the ceiling of the division of two numbers.
*
* This differs from standard division with `/` in that it rounds up instead
* of rounding down.
*/
function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
// (a + b - 1) / b can overflow on addition, so we distribute.
return a == 0 ? 0 : (a - 1) / b + 1;
}
/**
* @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
* @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
* with further edits by Uniswap Labs also under MIT license.
*/
function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) {
unchecked {
// 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
// use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
// variables such that product = prod1 * 2^256 + prod0.
uint256 prod0; // Least significant 256 bits of the product
uint256 prod1; // Most significant 256 bits of the product
assembly {
let mm := mulmod(x, y, not(0))
prod0 := mul(x, y)
prod1 := sub(sub(mm, prod0), lt(mm, prod0))
}
// Handle non-overflow cases, 256 by 256 division.
if (prod1 == 0) {
// Solidity will revert if denominator == 0, unlike the div opcode on its own.
// The surrounding unchecked block does not change this fact.
// See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.
return prod0 / denominator;
}
// Make sure the result is less than 2^256. Also prevents denominator == 0.
require(denominator > prod1, "Math: mulDiv overflow");
///////////////////////////////////////////////
// 512 by 256 division.
///////////////////////////////////////////////
// Make division exact by subtracting the remainder from [prod1 prod0].
uint256 remainder;
assembly {
// Compute remainder using mulmod.
remainder := mulmod(x, y, denominator)
// Subtract 256 bit number from 512 bit number.
prod1 := sub(prod1, gt(remainder, prod0))
prod0 := sub(prod0, remainder)
}
// Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
// See https://cs.stackexchange.com/q/138556/92363.
// Does not overflow because the denominator cannot be zero at this stage in the function.
uint256 twos = denominator & (~denominator + 1);
assembly {
// Divide denominator by twos.
denominator := div(denominator, twos)
// Divide [prod1 prod0] by twos.
prod0 := div(prod0, twos)
// Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
twos := add(div(sub(0, twos), twos), 1)
}
// Shift in bits from prod1 into prod0.
prod0 |= prod1 * twos;
// Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
// that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
// four bits. That is, denominator * inv = 1 mod 2^4.
uint256 inverse = (3 * denominator) ^ 2;
// Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
// in modular arithmetic, doubling the correct bits in each step.
inverse *= 2 - denominator * inverse; // inverse mod 2^8
inverse *= 2 - denominator * inverse; // inverse mod 2^16
inverse *= 2 - denominator * inverse; // inverse mod 2^32
inverse *= 2 - denominator * inverse; // inverse mod 2^64
inverse *= 2 - denominator * inverse; // inverse mod 2^128
inverse *= 2 - denominator * inverse; // inverse mod 2^256
// Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
// This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
// less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
// is no longer required.
result = prod0 * inverse;
return result;
}
}
/**
* @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
*/
function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) {
uint256 result = mulDiv(x, y, denominator);
if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
result += 1;
}
return result;
}
/**
* @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
*
* Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
*/
function sqrt(uint256 a) internal pure returns (uint256) {
if (a == 0) {
return 0;
}
// For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
//
// We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
// `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
//
// This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
// → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
// → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
//
// Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
uint256 result = 1 << (log2(a) >> 1);
// At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
// since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
// every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
// into the expected uint128 result.
unchecked {
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
return min(result, a / result);
}
}
/**
* @notice Calculates sqrt(a), following the selected rounding direction.
*/
function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
unchecked {
uint256 result = sqrt(a);
return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
}
}
/**
* @dev Return the log in base 2, rounded down, of a positive value.
* Returns 0 if given 0.
*/
function log2(uint256 value) internal pure returns (uint256) {
uint256 result = 0;
unchecked {
if (value >> 128 > 0) {
value >>= 128;
result += 128;
}
if (value >> 64 > 0) {
value >>= 64;
result += 64;
}
if (value >> 32 > 0) {
value >>= 32;
result += 32;
}
if (value >> 16 > 0) {
value >>= 16;
result += 16;
}
if (value >> 8 > 0) {
value >>= 8;
result += 8;
}
if (value >> 4 > 0) {
value >>= 4;
result += 4;
}
if (value >> 2 > 0) {
value >>= 2;
result += 2;
}
if (value >> 1 > 0) {
result += 1;
}
}
return result;
}
/**
* @dev Return the log in base 2, following the selected rounding direction, of a positive value.
* Returns 0 if given 0.
*/
function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
unchecked {
uint256 result = log2(value);
return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
}
}
/**
* @dev Return the log in base 10, rounded down, of a positive value.
* Returns 0 if given 0.
*/
function log10(uint256 value) internal pure returns (uint256) {
uint256 result = 0;
unchecked {
if (value >= 10 ** 64) {
value /= 10 ** 64;
result += 64;
}
if (value >= 10 ** 32) {
value /= 10 ** 32;
result += 32;
}
if (value >= 10 ** 16) {
value /= 10 ** 16;
result += 16;
}
if (value >= 10 ** 8) {
value /= 10 ** 8;
result += 8;
}
if (value >= 10 ** 4) {
value /= 10 ** 4;
result += 4;
}
if (value >= 10 ** 2) {
value /= 10 ** 2;
result += 2;
}
if (value >= 10 ** 1) {
result += 1;
}
}
return result;
}
/**
* @dev Return the log in base 10, following the selected rounding direction, of a positive value.
* Returns 0 if given 0.
*/
function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
unchecked {
uint256 result = log10(value);
return result + (rounding == Rounding.Up && 10 ** result < value ? 1 : 0);
}
}
/**
* @dev Return the log in base 256, rounded down, of a positive value.
* Returns 0 if given 0.
*
* Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
*/
function log256(uint256 value) internal pure returns (uint256) {
uint256 result = 0;
unchecked {
if (value >> 128 > 0) {
value >>= 128;
result += 16;
}
if (value >> 64 > 0) {
value >>= 64;
result += 8;
}
if (value >> 32 > 0) {
value >>= 32;
result += 4;
}
if (value >> 16 > 0) {
value >>= 16;
result += 2;
}
if (value >> 8 > 0) {
result += 1;
}
}
return result;
}
/**
* @dev Return the log in base 256, following the selected rounding direction, of a positive value.
* Returns 0 if given 0.
*/
function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
unchecked {
uint256 result = log256(value);
return result + (rounding == Rounding.Up && 1 << (result << 3) < value ? 1 : 0);
}
}
}
// File: @openzeppelin/contracts-upgradeable/utils/StringsUpgradeable.sol
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Strings.sol)
pragma solidity ^0.8.0;
/**
* @dev String operations.
*/
library StringsUpgradeable {
bytes16 private constant _SYMBOLS = "0123456789abcdef";
uint8 private constant _ADDRESS_LENGTH = 20;
/**
* @dev Converts a `uint256` to its ASCII `string` decimal representation.
*/
function toString(uint256 value) internal pure returns (string memory) {
unchecked {
uint256 length = MathUpgradeable.log10(value) + 1;
string memory buffer = new string(length);
uint256 ptr;
/// @solidity memory-safe-assembly
assembly {
ptr := add(buffer, add(32, length))
}
while (true) {
ptr--;
/// @solidity memory-safe-assembly
assembly {
mstore8(ptr, byte(mod(value, 10), _SYMBOLS))
}
value /= 10;
if (value == 0) break;
}
return buffer;
}
}
/**
* @dev Converts a `int256` to its ASCII `string` decimal representation.
*/
function toString(int256 value) internal pure returns (string memory) {
return string(abi.encodePacked(value < 0 ? "-" : "", toString(SignedMathUpgradeable.abs(value))));
}
/**
* @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
*/
function toHexString(uint256 value) internal pure returns (string memory) {
unchecked {
return toHexString(value, MathUpgradeable.log256(value) + 1);
}
}
/**
* @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
*/
function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
bytes memory buffer = new bytes(2 * length + 2);
buffer[0] = "0";
buffer[1] = "x";
for (uint256 i = 2 * length + 1; i > 1; --i) {
buffer[i] = _SYMBOLS[value & 0xf];
value >>= 4;
}
require(value == 0, "Strings: hex length insufficient");
return string(buffer);
}
/**
* @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
*/
function toHexString(address addr) internal pure returns (string memory) {
return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
}
/**
* @dev Returns true if the two strings are equal.
*/
function equal(string memory a, string memory b) internal pure returns (bool) {
return keccak256(bytes(a)) == keccak256(bytes(b));
}
}
// File: @openzeppelin/contracts-upgradeable/access/IAccessControlUpgradeable.sol
// OpenZeppelin Contracts v4.4.1 (access/IAccessControl.sol)
pragma solidity ^0.8.0;
/**
* @dev External interface of AccessControl declared to support ERC165 detection.
*/
interface IAccessControlUpgradeable {
/**
* @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
*
* `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
* {RoleAdminChanged} not being emitted signaling this.
*
* _Available since v3.1._
*/
event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);
/**
* @dev Emitted when `account` is granted `role`.
*
* `sender` is the account that originated the contract call, an admin role
* bearer except when using {AccessControl-_setupRole}.
*/
event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);
/**
* @dev Emitted when `account` is revoked `role`.
*
* `sender` is the account that originated the contract call:
* - if using `revokeRole`, it is the admin role bearer
* - if using `renounceRole`, it is the role bearer (i.e. `account`)
*/
event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);
/**
* @dev Returns `true` if `account` has been granted `role`.
*/
function hasRole(bytes32 role, address account) external view returns (bool);
/**
* @dev Returns the admin role that controls `role`. See {grantRole} and
* {revokeRole}.
*
* To change a role's admin, use {AccessControl-_setRoleAdmin}.
*/
function getRoleAdmin(bytes32 role) external view returns (bytes32);
/**
* @dev Grants `role` to `account`.
*
* If `account` had not been already granted `role`, emits a {RoleGranted}
* event.
*
* Requirements:
*
* - the caller must have ``role``'s admin role.
*/
function grantRole(bytes32 role, address account) external;
/**
* @dev Revokes `role` from `account`.
*
* If `account` had been granted `role`, emits a {RoleRevoked} event.
*
* Requirements:
*
* - the caller must have ``role``'s admin role.
*/
function revokeRole(bytes32 role, address account) external;
/**
* @dev Revokes `role` from the calling account.
*
* Roles are often managed via {grantRole} and {revokeRole}: this function's
* purpose is to provide a mechanism for accounts to lose their privileges
* if they are compromised (such as when a trusted device is misplaced).
*
* If the calling account had been granted `role`, emits a {RoleRevoked}
* event.
*
* Requirements:
*
* - the caller must be `account`.
*/
function renounceRole(bytes32 role, address account) external;
}
// File: @openzeppelin/contracts-upgradeable/utils/AddressUpgradeable.sol
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)
pragma solidity ^0.8.1;
/**
* @dev Collection of functions related to the address type
*/
library AddressUpgradeable {
/**
* @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
*
* Furthermore, `isContract` will also return true if the target contract within
* the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
* which only has an effect at the end of a transaction.
* ====
*
* [IMPORTANT]
* ====
* You shouldn't rely on `isContract` to protect against flash loan attacks!
*
* Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
* like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
* constructor.
* ====
*/
function isContract(address account) internal view returns (bool) {
// This method relies on extcodesize/address.code.length, which returns 0
// for contracts in construction, since the code is only stored at the end
// of the constructor execution.
return account.code.length > 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://consensys.net/diligence/blog/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/v0.8.0/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");
(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 functionCallWithValue(target, data, 0, "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");
(bool success, bytes memory returndata) = target.call{value: value}(data);
return verifyCallResultFromTarget(target, 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) {
(bool success, bytes memory returndata) = target.staticcall(data);
return verifyCallResultFromTarget(target, 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) {
(bool success, bytes memory returndata) = target.delegatecall(data);
return verifyCallResultFromTarget(target, success, returndata, errorMessage);
}
/**
* @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
* the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
*
* _Available since v4.8._
*/
function verifyCallResultFromTarget(
address target,
bool success,
bytes memory returndata,
string memory errorMessage
) internal view returns (bytes memory) {
if (success) {
if (returndata.length == 0) {
// only check isContract if the call was successful and the return data is empty
// otherwise we already know that it was a contract
require(isContract(target), "Address: call to non-contract");
}
return returndata;
} else {
_revert(returndata, errorMessage);
}
}
/**
* @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
* revert reason or using the provided one.
*
* _Available since v4.3._
*/
function verifyCallResult(
bool success,
bytes memory returndata,
string memory errorMessage
) internal pure returns (bytes memory) {
if (success) {
return returndata;
} else {
_revert(returndata, errorMessage);
}
}
function _revert(bytes memory returndata, string memory errorMessage) private pure {
// 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
/// @solidity memory-safe-assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
// File: @openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol
// OpenZeppelin Contracts (last updated v4.9.0) (proxy/utils/Initializable.sol)
pragma solidity ^0.8.2;
/**
* @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
* behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
* external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
* function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
*
* The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
* reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
* case an upgrade adds a module that needs to be initialized.
*
* For example:
*
* [.hljs-theme-light.nopadding]
* ```solidity
* contract MyToken is ERC20Upgradeable {
* function initialize() initializer public {
* __ERC20_init("MyToken", "MTK");
* }
* }
*
* contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
* function initializeV2() reinitializer(2) public {
* __ERC20Permit_init("MyToken");
* }
* }
* ```
*
* TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
* possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
*
* CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
* that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
*
* [CAUTION]
* ====
* Avoid leaving a contract uninitialized.
*
* An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
* contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke
* the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
*
* [.hljs-theme-light.nopadding]
* ```
* /// @custom:oz-upgrades-unsafe-allow constructor
* constructor() {
* _disableInitializers();
* }
* ```
* ====
*/
abstract contract Initializable {
/**
* @dev Indicates that the contract has been initialized.
* @custom:oz-retyped-from bool
*/
uint8 private _initialized;
/**
* @dev Indicates that the contract is in the process of being initialized.
*/
bool private _initializing;
/**
* @dev Triggered when the contract has been initialized or reinitialized.
*/
event Initialized(uint8 version);
/**
* @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
* `onlyInitializing` functions can be used to initialize parent contracts.
*
* Similar to `reinitializer(1)`, except that functions marked with `initializer` can be nested in the context of a
* constructor.
*
* Emits an {Initialized} event.
*/
modifier initializer() {
bool isTopLevelCall = !_initializing;
require(
(isTopLevelCall && _initialized < 1) || (!AddressUpgradeable.isContract(address(this)) && _initialized == 1),
"Initializable: contract is already initialized"
);
_initialized = 1;
if (isTopLevelCall) {
_initializing = true;
}
_;
if (isTopLevelCall) {
_initializing = false;
emit Initialized(1);
}
}
/**
* @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
* contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
* used to initialize parent contracts.
*
* A reinitializer may be used after the original initialization step. This is essential to configure modules that
* are added through upgrades and that require initialization.
*
* When `version` is 1, this modifier is similar to `initializer`, except that functions marked with `reinitializer`
* cannot be nested. If one is invoked in the context of another, execution will revert.
*
* Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
* a contract, executing them in the right order is up to the developer or operator.
*
* WARNING: setting the version to 255 will prevent any future reinitialization.
*
* Emits an {Initialized} event.
*/
modifier reinitializer(uint8 version) {
require(!_initializing && _initialized < version, "Initializable: contract is already initialized");
_initialized = version;
_initializing = true;
_;
_initializing = false;
emit Initialized(version);
}
/**
* @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
* {initializer} and {reinitializer} modifiers, directly or indirectly.
*/
modifier onlyInitializing() {
require(_initializing, "Initializable: contract is not initializing");
_;
}
/**
* @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
* Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
* to any version. It is recommended to use this to lock implementation contracts that are designed to be called
* through proxies.
*
* Emits an {Initialized} event the first time it is successfully executed.
*/
function _disableInitializers() internal virtual {
require(!_initializing, "Initializable: contract is initializing");
if (_initialized != type(uint8).max) {
_initialized = type(uint8).max;
emit Initialized(type(uint8).max);
}
}
/**
* @dev Returns the highest version that has been initialized. See {reinitializer}.
*/
function _getInitializedVersion() internal view returns (uint8) {
return _initialized;
}
/**
* @dev Returns `true` if the contract is currently initializing. See {onlyInitializing}.
*/
function _isInitializing() internal view returns (bool) {
return _initializing;
}
}
// File: @openzeppelin/contracts-upgradeable/security/ReentrancyGuardUpgradeable.sol
// OpenZeppelin Contracts (last updated v4.9.0) (security/ReentrancyGuard.sol)
pragma solidity ^0.8.0;
/**
* @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].
*/
abstract contract ReentrancyGuardUpgradeable is Initializable {
// 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;
function __ReentrancyGuard_init() internal onlyInitializing {
__ReentrancyGuard_init_unchained();
}
function __ReentrancyGuard_init_unchained() internal onlyInitializing {
_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 making it call a
* `private` function that does the actual work.
*/
modifier nonReentrant() {
_nonReentrantBefore();
_;
_nonReentrantAfter();
}
function _nonReentrantBefore() private {
// On the first call to nonReentrant, _status will be _NOT_ENTERED
require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
// Any calls to nonReentrant after this point will fail
_status = _ENTERED;
}
function _nonReentrantAfter() private {
// By storing the original value once again, a refund is triggered (see
// https://eips.ethereum.org/EIPS/eip-2200)
_status = _NOT_ENTERED;
}
/**
* @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
* `nonReentrant` function in the call stack.
*/
function _reentrancyGuardEntered() internal view returns (bool) {
return _status == _ENTERED;
}
/**
* @dev This empty reserved space is put in place to allow future versions to add new
* variables without shifting down storage in the inheritance chain.
* See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
*/
uint256[49] private __gap;
}
// File: @openzeppelin/contracts-upgradeable/utils/introspection/ERC165Upgradeable.sol
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)
pragma solidity ^0.8.0;
/**
* @dev Implementation of the {IERC165} interface.
*
* Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
* for the additional interface id that will be supported. For example:
*
* ```solidity
* function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
* return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
* }
* ```
*
* Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
*/
abstract contract ERC165Upgradeable is Initializable, IERC165Upgradeable {
function __ERC165_init() internal onlyInitializing {
}
function __ERC165_init_unchained() internal onlyInitializing {
}
/**
* @dev See {IERC165-supportsInterface}.
*/
function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
return interfaceId == type(IERC165Upgradeable).interfaceId;
}
/**
* @dev This empty reserved space is put in place to allow future versions to add new
* variables without shifting down storage in the inheritance chain.
* See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
*/
uint256[50] private __gap;
}
// File: @openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
pragma solidity ^0.8.0;
/**
* @dev 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, since when dealing with meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
abstract contract ContextUpgradeable is Initializable {
function __Context_init() internal onlyInitializing {
}
function __Context_init_unchained() internal onlyInitializing {
}
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
/**
* @dev This empty reserved space is put in place to allow future versions to add new
* variables without shifting down storage in the inheritance chain.
* See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
*/
uint256[50] private __gap;
}
// File: @openzeppelin/contracts-upgradeable/access/AccessControlUpgradeable.sol
// OpenZeppelin Contracts (last updated v4.9.0) (access/AccessControl.sol)
pragma solidity ^0.8.0;
/**
* @dev Contract module that allows children to implement role-based access
* control mechanisms. This is a lightweight version that doesn't allow enumerating role
* members except through off-chain means by accessing the contract event logs. Some
* applications may benefit from on-chain enumerability, for those cases see
* {AccessControlEnumerable}.
*
* Roles are referred to by their `bytes32` identifier. These should be exposed
* in the external API and be unique. The best way to achieve this is by
* using `public constant` hash digests:
*
* ```solidity
* bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
* ```
*
* Roles can be used to represent a set of permissions. To restrict access to a
* function call, use {hasRole}:
*
* ```solidity
* function foo() public {
* require(hasRole(MY_ROLE, msg.sender));
* ...
* }
* ```
*
* Roles can be granted and revoked dynamically via the {grantRole} and
* {revokeRole} functions. Each role has an associated admin role, and only
* accounts that have a role's admin role can call {grantRole} and {revokeRole}.
*
* By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
* that only accounts with this role will be able to grant or revoke other
* roles. More complex role relationships can be created by using
* {_setRoleAdmin}.
*
* WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
* grant and revoke this role. Extra precautions should be taken to secure
* accounts that have been granted it. We recommend using {AccessControlDefaultAdminRules}
* to enforce additional security measures for this role.
*/
abstract contract AccessControlUpgradeable is Initializable, ContextUpgradeable, IAccessControlUpgradeable, ERC165Upgradeable {
function __AccessControl_init() internal onlyInitializing {
}
function __AccessControl_init_unchained() internal onlyInitializing {
}
struct RoleData {
mapping(address => bool) members;
bytes32 adminRole;
}
mapping(bytes32 => RoleData) private _roles;
bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;
/**
* @dev Modifier that checks that an account has a specific role. Reverts
* with a standardized message including the required role.
*
* The format of the revert reason is given by the following regular expression:
*
* /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
*
* _Available since v4.1._
*/
modifier onlyRole(bytes32 role) {
_checkRole(role);
_;
}
/**
* @dev See {IERC165-supportsInterface}.
*/
function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
return interfaceId == type(IAccessControlUpgradeable).interfaceId || super.supportsInterface(interfaceId);
}
/**
* @dev Returns `true` if `account` has been granted `role`.
*/
function hasRole(bytes32 role, address account) public view virtual override returns (bool) {
return _roles[role].members[account];
}
/**
* @dev Revert with a standard message if `_msgSender()` is missing `role`.
* Overriding this function changes the behavior of the {onlyRole} modifier.
*
* Format of the revert message is described in {_checkRole}.
*
* _Available since v4.6._
*/
function _checkRole(bytes32 role) internal view virtual {
_checkRole(role, _msgSender());
}
/**
* @dev Revert with a standard message if `account` is missing `role`.
*
* The format of the revert reason is given by the following regular expression:
*
* /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
*/
function _checkRole(bytes32 role, address account) internal view virtual {
if (!hasRole(role, account)) {
revert(
string(
abi.encodePacked(
"AccessControl: account ",
StringsUpgradeable.toHexString(account),
" is missing role ",
StringsUpgradeable.toHexString(uint256(role), 32)
)
)
);
}
}
/**
* @dev Returns the admin role that controls `role`. See {grantRole} and
* {revokeRole}.
*
* To change a role's admin, use {_setRoleAdmin}.
*/
function getRoleAdmin(bytes32 role) public view virtual override returns (bytes32) {
return _roles[role].adminRole;
}
/**
* @dev Grants `role` to `account`.
*
* If `account` had not been already granted `role`, emits a {RoleGranted}
* event.
*
* Requirements:
*
* - the caller must have ``role``'s admin role.
*
* May emit a {RoleGranted} event.
*/
function grantRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
_grantRole(role, account);
}
/**
* @dev Revokes `role` from `account`.
*
* If `account` had been granted `role`, emits a {RoleRevoked} event.
*
* Requirements:
*
* - the caller must have ``role``'s admin role.
*
* May emit a {RoleRevoked} event.
*/
function revokeRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
_revokeRole(role, account);
}
/**
* @dev Revokes `role` from the calling account.
*
* Roles are often managed via {grantRole} and {revokeRole}: this function's
* purpose is to provide a mechanism for accounts to lose their privileges
* if they are compromised (such as when a trusted device is misplaced).
*
* If the calling account had been revoked `role`, emits a {RoleRevoked}
* event.
*
* Requirements:
*
* - the caller must be `account`.
*
* May emit a {RoleRevoked} event.
*/
function renounceRole(bytes32 role, address account) public virtual override {
require(account == _msgSender(), "AccessControl: can only renounce roles for self");
_revokeRole(role, account);
}
/**
* @dev Grants `role` to `account`.
*
* If `account` had not been already granted `role`, emits a {RoleGranted}
* event. Note that unlike {grantRole}, this function doesn't perform any
* checks on the calling account.
*
* May emit a {RoleGranted} event.
*
* [WARNING]
* ====
* This function should only be called from the constructor when setting
* up the initial roles for the system.
*
* Using this function in any other way is effectively circumventing the admin
* system imposed by {AccessControl}.
* ====
*
* NOTE: This function is deprecated in favor of {_grantRole}.
*/
function _setupRole(bytes32 role, address account) internal virtual {
_grantRole(role, account);
}
/**
* @dev Sets `adminRole` as ``role``'s admin role.
*
* Emits a {RoleAdminChanged} event.
*/
function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
bytes32 previousAdminRole = getRoleAdmin(role);
_roles[role].adminRole = adminRole;
emit RoleAdminChanged(role, previousAdminRole, adminRole);
}
/**
* @dev Grants `role` to `account`.
*
* Internal function without access restriction.
*
* May emit a {RoleGranted} event.
*/
function _grantRole(bytes32 role, address account) internal virtual {
if (!hasRole(role, account)) {
_roles[role].members[account] = true;
emit RoleGranted(role, account, _msgSender());
}
}
/**
* @dev Revokes `role` from `account`.
*
* Internal function without access restriction.
*
* May emit a {RoleRevoked} event.
*/
function _revokeRole(bytes32 role, address account) internal virtual {
if (hasRole(role, account)) {
_roles[role].members[account] = false;
emit RoleRevoked(role, account, _msgSender());
}
}
/**
* @dev This empty reserved space is put in place to allow future versions to add new
* variables without shifting down storage in the inheritance chain.
* See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
*/
uint256[49] private __gap;
}
// File: @openzeppelin/contracts-upgradeable/security/PausableUpgradeable.sol
// OpenZeppelin Contracts (last updated v4.7.0) (security/Pausable.sol)
pragma solidity ^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 PausableUpgradeable is Initializable, ContextUpgradeable {
/**
* @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.
*/
function __Pausable_init() internal onlyInitializing {
__Pausable_init_unchained();
}
function __Pausable_init_unchained() internal onlyInitializing {
_paused = false;
}
/**
* @dev Modifier to make a function callable only when the contract is not paused.
*
* Requirements:
*
* - The contract must not be paused.
*/
modifier whenNotPaused() {
_requireNotPaused();
_;
}
/**
* @dev Modifier to make a function callable only when the contract is paused.
*
* Requirements:
*
* - The contract must be paused.
*/
modifier whenPaused() {
_requirePaused();
_;
}
/**
* @dev Returns true if the contract is paused, and false otherwise.
*/
function paused() public view virtual returns (bool) {
return _paused;
}
/**
* @dev Throws if the contract is paused.
*/
function _requireNotPaused() internal view virtual {
require(!paused(), "Pausable: paused");
}
/**
* @dev Throws if the contract is not paused.
*/
function _requirePaused() internal view virtual {
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());
}
/**
* @dev This empty reserved space is put in place to allow future versions to add new
* variables without shifting down storage in the inheritance chain.
* See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
*/
uint256[49] private __gap;
}
// File: contracts/IOTXStaking.sol
/*
* ==================================================================
* Copyright (C) 2023 Altstake Technology Pte. Ltd. (RockX)
* This code is free software; you can redistribute it
* and/or modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 3 of the License,
* or (at your option) any later version.
* This code is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License.
* If not, see <http://www.gnu.org/licenses/>
* ==================================================================
*/
pragma solidity ^0.8.9;
contract IOTXStaking is IIOTXStaking, Initializable, PausableUpgradeable, AccessControlUpgradeable, ReentrancyGuardUpgradeable {
address public systemStaking;
address public uniIOTX;
address public iotxClear;
uint private constant DEFAULT_EXCHANGE_RATIO = 1;
uint private constant MULTIPLIER = 1e18;
/**
* @dev The global delegate for upcoming deposit activities.
*/
address public globalDelegate;
/**
* @dev The startAmount, commonRatio and sequenceLength collectively constitute a geometric sequence
* for the staking amount that can be committed to the IoTeX network through our liquid staking protocol.
* Each value in this sequence must be a valid bucket amount, as predefined by the IoTeX network.
* Each value in this sequence corresponds to a unique indexed level within the range of [0, sequenceLength-1]
* Once set, the sequence remains immutable.
*/
uint public startAmount;
uint public commonRatio;
uint public sequenceLength;
/**
* @dev Users can deposit any amount of IOTXs, but can only redeem amounts that are in multiples of the redeemAmountBase.
* This value is determined at contract initialization using the formula:
* redeemAmountBase = startAmount * (commonRatio ** (sequenceLength-1))
* Once set, it remains immutable.
*/
uint public redeemAmountBase;
/**
* @dev The global stake duration for upcoming deposit activities.
* This value is determined at contract initialization.
* Once set, it remains immutable.
*/
uint public stakeDuration;
/**
* @dev Token queue map for token ID management:
* 1. The KEY corresponds to the bucket amount level defined as above.
* 2. The VALUE is a dynamic array of token IDs.
*/
mapping(uint => uint[]) private tokenQueues;
/**
* @dev The number of redeemed tokens can change only when a redeeming operation is performed.
* In addition, the staked token count at the highest staking level can be calculated using this formula:
* tokenQueues[sequenceLength-1].length - redeemedTokenCount
*/
uint public redeemedTokenCount;
/**
* @dev The balance synchronized from this contract fluctuates due to several factors:
* 1. It increases when users deposit IOTXs for liquid staking service.
* 2. It increases when rewards are distributed by delegates.
* 3. It decreases when pending IOTXs are staked with delegates.
*/
uint public accountedBalance;
/**
* @dev The total pending IOTXs fluctuates due to several factors:
* 1. It increases when users deposit IOTXs for liquid staking service.
* 2. It increases when users' rewards are compounded..
* 3. It increases when the manager fee is withdrawn.
* 4. It decreases when pending IOTXs are staked with delegates.
*/
uint public totalPending;
/**
* @dev The total staked IOTXs fluctuates due to several factors:
* 1.It increases when pending IOTXs are staked with delegates.
* 2. It decreases when users request to redeem IOTXs.
*/
uint public totalStaked;
/**
* @dev The manager fee share ranges from 0 to 1000, as regulated by the default Admin.
*/
uint public managerFeeShares;
/**
* @dev The accounted user rewards will increase when the rewards are divided.
* The total is equivalent to the amount of automatic compounding.
*/
uint public accountedUserReward;
/**
* @dev The accounted manger rewards will increase when the rewards are divided.
* However, the quantity will decrease when the manager's fee is deducted.
*/
uint public accountedManagerReward;
event Minted(address user, uint minted);
event Redeemed(address user, uint burned, uint[] tokenIds);
event Staked(uint firstTokenId, uint amount, address delegate, uint count);
event Merged(uint fromLevel, uint toLevel, uint amount);
event RewardUpdated(uint amount);
event ManagerFeeSharesSet(uint shares);
event ManagerFeeWithdrawed(uint amount, uint minted, address recipient);
event GlobalDelegateSet(address delegate);
event DelegatesUpdated(uint[] tokenIds, address delegate);
modifier onlyValidTransaction(uint deadline) {
require(deadline > block.timestamp, "USR001"); // Transaction expired
_;
}
/**
* ======================================================================================
*
* SYSTEM SETTINGS
*
* ======================================================================================
*/
/**
* @dev This function is exclusively designed to receive staking rewards.
* The 'deposit' function should be invoked whenever users wish to stake IOTXs.
* Any IOTXs accidentally sent to this contract will be considered as rewards.
*/
receive() external payable { }
/**
* @dev This function pauses the contract
*/
function pause() public onlyRole(ROLE_PAUSER) {
_pause();
}
/**
* @dev This function unpauses the contract
*/
function unpause() public onlyRole(ROLE_PAUSER) {
_unpause();
}
/**
* @dev @custom:oz-upgrades-unsafe-allow constructor
*/
constructor() {
_disableInitializers();
}
/**
* @dev This function initializes the contract.
*/
function initialize(
address _systemStaking,
address _uniIOTX,
address _iotxClear,
address _oracle,
address _pauser,
uint _startAmount,
uint _commonRatio,
uint _sequenceLength,
uint _stakeDuration
) public initializer {
// Init
__Pausable_init();
__AccessControl_init();
__ReentrancyGuard_init();
// Roles
_setupRole(DEFAULT_ADMIN_ROLE, msg.sender);
_setupRole(ROLE_FEE_MANAGER, msg.sender);
_setupRole(ROLE_PAUSER, _pauser);
_setupRole(ROLE_ORACLE, _oracle);
// Collaborative contracts
systemStaking = _systemStaking;
uniIOTX = _uniIOTX;
iotxClear = _iotxClear;
// Immutable staking variables
startAmount = _startAmount;
commonRatio = _commonRatio;
sequenceLength = _sequenceLength;
stakeDuration = _stakeDuration;
redeemAmountBase = startAmount * (commonRatio ** (sequenceLength-1));
// Validate bucket type info
for (uint level = 0; level < _sequenceLength; level++) {
uint amount = _startAmount * (_commonRatio**level);
bool isActive = ISystemStaking(systemStaking).isActiveBucketType(amount, _stakeDuration);
require(isActive, "SYS001"); // Inactive bucket type
}
}
/**
* @dev This function sets manager's fee in range [0, 1000]
*/
function setManagerFeeShares(uint shares) external onlyRole(DEFAULT_ADMIN_ROLE) {
require(shares <= 1000, "SYS002"); // Manager fee shares out of range
managerFeeShares = shares;
emit ManagerFeeSharesSet(shares);
}
/**
* ======================================================================================
*
* VIEW FUNCTIONS
*
* ======================================================================================
*/
/**
* @dev This function is the 'IERC721Receiver' implement for receiving staking NFT
*/
function onERC721Received(
address, // operator
address, // from
uint, // tokenId
bytes calldata // data
) external pure override returns (bytes4) {
return this.onERC721Received.selector;
}
/**
* @dev The factors that affect the returned result are the same as those of the 'currentReserve' function.
* @return ratio The current exchange ratio of uniIOTX to IOTX, multiplied by 1e18.
*/
function exchangeRatio() external view returns (uint ratio) {
return _exchangeRatio();
}
/**
* @dev The returned amount is determined by the following contributions:
* 1. User deposits/stakes their principal.
* 2. Rewards generated from delegation, excluding manager rewards, are added to the reserve.
* 3. The manager fee is withdrawn and included in the totalPending amount.
* 4. When users make a 'redeem' call, the totalStaked amount decreases.
* 5. The Oracle service should regularly call the 'updateReward' function to account for new rewards.
* @return The current reserve of IOTXs in our liquid staking protocol.
*/
function currentReserve() external view returns(uint) {
return _currentReserve();
}
/**
* @return The array of IOTX amounts that remain constant and active for each staking activity.
*/
function getStakeAmounts() external view returns (uint[] memory) {
uint[] memory amounts = new uint[](sequenceLength);
for (uint level = 0; level < sequenceLength; level++) {
uint amount = startAmount * (commonRatio**level);
amounts[level] = amount;
}
return amounts;
}
/**
* @return The global delegate that is utilized for upcoming staking requests.
*/
function getGlobalDelegate() external view returns (address) {
return globalDelegate;
}
/**
* @notice The amount to be redeemed must be in multiples of the 'redeemAmountBase'.
* @return The base amount that remains constant for each redeeming request.
*/
function getRedeemAmountBase() external view returns (uint) {
return redeemAmountBase;
}
/**
* @return The stake duration in seconds that remains constant for each staking request.
*/
function getStakeDuration() external view returns (uint) {
return stakeDuration;
}
/**
* @return The balance that has been synchronized and accounted for this contract.
*/
function getAccountedBalance() external view returns (uint) {
return accountedBalance;
}
/**
* @return the pending reward that has not yet been synchronized and accounted for.
*/
function getPendingReward() external view returns(uint) {
return address(this).balance - accountedBalance;
}
/**
* @return The total amount of IOTX awaiting staking, including the pending user reward.
*/
function getTotalPending() external view returns (uint) {
(uint pendingUserReward, ) = _calcPendingReward();
return totalPending + pendingUserReward;
}
/**
* @return The total amount of staked IOTX.
*/
function getTotalStaked() external view returns (uint) {
return totalStaked;
}
/**
* @return The current manager fee shares.
*/
function getManagerFeeShares() external view returns (uint) {
return managerFeeShares;
}
/**
* @return The amount of the user's shared reward, including the pending portion.
*/
function getUserReward() external view returns (uint) {
(uint userRewardIncr, ) = _calcPendingReward();
return accountedUserReward + userRewardIncr;
}
/**
* @return The amount of the manager's reward, including the pending portion.
*/
function getManagerReward() external view returns (uint) {
(, uint pendingManagerReward) = _calcPendingReward();
return accountedManagerReward + pendingManagerReward;
}
/**
* @return The amount of the user's shared reward that has been automatically compounded for upcoming staking requests.
*/
function getCompoundedAmount() external view returns (uint) {
return accountedUserReward;
}
/**
* @dev If an invalid tokenQueueIndex is given, a zero value will be returned.
* @param tokenQueueIndex The token queue index falls within the range of [0, sequenceLength).
* @return The length of the queried token queue.
*/
function getTokenQueueLength(uint tokenQueueIndex) external view returns (uint) {
if (tokenQueueIndex < sequenceLength) {
return tokenQueues[tokenQueueIndex].length;
}
return 0;
}
/**
* @dev If an invalid tokenQueueIndex is given, a zero value will be returned.
* @param tokenQueueIndex The token queue index falls within the range of [0, sequenceLength).
* @return count The current staked token count of the specified token queue.
*/
function getStakedTokenCount(uint tokenQueueIndex) external view returns (uint count) {
if (tokenQueueIndex < sequenceLength) {
uint queueLen = tokenQueues[tokenQueueIndex].length;
if (tokenQueueIndex == sequenceLength-1) {
count = queueLen - redeemedTokenCount;
} else {
count = queueLen;
}
}
}
/**
* @return The number of redeemed token IDs.
*/
function getRedeemedTokenCount() external view returns (uint) {
return redeemedTokenCount;
}
/**
* @dev If an invalid tokenQueueIndex and tokenIndex are given, a zero value will be returned.
* @param tokenQueueIndex The token queue index falls within the range of [0, sequenceLength).
* @param tokenIndex The token index is within the range of [0, tokenQueue.Length) in the specified token queue..
* @return tokenId The queried token ID.
*/
function getTokenId(uint tokenQueueIndex, uint tokenIndex) external view returns (uint tokenId) {
if (tokenQueueIndex < sequenceLength && tokenIndex < tokenQueues[tokenQueueIndex].length) {
return tokenQueues[tokenQueueIndex][tokenIndex];
}
return 0;
}
/**
* @dev If an invalid tokenQueueIndex is given, an empty array will be returned.
* @param tokenQueueIndex The token queue index falls within the range of [0, sequenceLength)
* @return The staked token IDs for the specified index.
*/
function getStakedTokenIds(uint tokenQueueIndex) external view returns (uint[] memory) {
if (tokenQueueIndex < sequenceLength) {
uint[] memory tq = tokenQueues[tokenQueueIndex];
uint queueLen = tq.length;
if (tokenQueueIndex == sequenceLength-1) {
uint stakedCount = queueLen - redeemedTokenCount;
uint[] memory tokenIds = new uint[](stakedCount);
for (uint i = 0; i < stakedCount; i++) {
tokenIds[i] = tq[redeemedTokenCount+i];
}
return tokenIds;
} else {
return tq;
}
}
return new uint[](0);
}
/**
* @dev If param values are given, an empty array will be returned.
* @param tokenQueueIndex The token queue index falls within the range of [0, sequenceLength)
* @param i, j The index values for i and j should satisfy the following conditions:
* 1. i < j && j < tokenQueues[tokenQueueIndex].length.
* 2. i >= redeemedTokenCount if tokenQueueIndex == sequenceLength-1.
* @return An [i, j) slice of staked token IDs for the specified index.
*/
function getStakedTokenIdSlice(uint tokenQueueIndex, uint i, uint j) external view returns (uint[] memory) {
if (tokenQueueIndex < sequenceLength && i < j) {
uint[] memory tq = tokenQueues[tokenQueueIndex];
uint[] memory tokenIds = new uint[](j-i);
if (j <= tq.length) {
for (uint k = 0; k < j-i; k++) {
tokenIds[k] = tq[i+k];
}
bool validI = true;
if (tokenQueueIndex == sequenceLength-1 && i < redeemedTokenCount) {
validI = false;
}
if (validI) {
return tokenIds;
}
}
}
return new uint[](0);
}
/**
* @return An array of already redeemed/unlocked token id, which is indexed from 0 in this contract.
*/
function getRedeemedTokenIds() external view returns (uint[] memory) {
uint[] memory tq = tokenQueues[sequenceLength-1];
uint[] memory tokenIds = new uint[](redeemedTokenCount);
for (uint i = 0; i < redeemedTokenCount; i++) {
tokenIds[i] = tq[i];
}
return tokenIds;
}
/**
* @dev If an invalid tokenQueueIndex is given, an empty array will be returned.
* @dev It recommended to check the value of 'redeemedTokenCount' beforehand to prevent the passed j from going out of range.
* @param i, j The valid index values for i and j are determined by this conditional check: i < j && j <= redeemedTokenCount
* @return An [i, j) slice of already redeemed/unlocked token id, which is indexed from 0 in this contract.
*/
function getRedeemedTokenIdSlice(uint i, uint j) external view returns (uint[] memory) {
if (i < j && j <= redeemedTokenCount) {
uint[] memory tq = tokenQueues[sequenceLength-1];
uint[] memory tokenIds = new uint[](j-i);
for (uint k = 0; k < j-i; k++) {
tokenIds[k] = tq[i+k];
}
return tokenIds;
}
return new uint[](0);
}
/**
* ======================================================================================
*
* EXTERNAL FUNCTIONS FOR ORACLE
*
* ======================================================================================
*/
/**
* @dev This function sets the global delegate for upcoming deposit activities.
*/
function setGlobalDelegate(address delegate) external whenNotPaused onlyRole(ROLE_ORACLE) {
globalDelegate = delegate;
emit GlobalDelegateSet(delegate);
}
/**
* @dev This function updates the delegates of token IDs.
*/
function updateDelegates(uint[] calldata tokenIds, address delegate) external whenNotPaused onlyRole(ROLE_ORACLE) {
ISystemStaking(systemStaking).changeDelegates(tokenIds, delegate);
emit DelegatesUpdated(tokenIds, delegate);
}
/**
* @dev This function stakes any pending IOTXs and merges staked buckets when conditions are fulfilled.
* It synchronizes the most recently distributed reward before conducting the staking operation.
*/
function stake() external whenNotPaused onlyRole(ROLE_ORACLE) {
// Synchronize rewards
_updateReward();
// Proceed with the staking process.
_stakeAtTopLevel();
_stakeAndMergeAtSubLevel();
}
/**
* @dev This function distributes recently accrued rewards from delegates among users and the manager.
* It also automatically reinvests the users' share into totalPending for upcoming staking activities.
*/
function updateReward() external onlyRole(ROLE_ORACLE) {
_updateReward();
}
/**
* ======================================================================================
*
* EXTERNAL FUNCTIONS FOR USERS
*
* ======================================================================================
*/
/**
* @dev This function mints uniIOTXs for the user, stakes any pending IOTXs and
* merges staked buckets when conditions are fulfilled.
* @return minted The quantity of minted uniIOTXs
*/
function deposit(uint deadline) external payable nonReentrant whenNotPaused onlyValidTransaction(deadline) returns (uint minted) {
// Verify the transferred value
require(msg.value > 0, "USR002"); // Invalid deposit amount
accountedBalance += msg.value;
// Mint uniIOTX, keeping a consistent exchange ratio
_updateReward();
minted = _mint();
// Proceed with the staking process.
_stakeAtTopLevel();
_stakeAndMergeAtSubLevel();
}
/**
* @dev This function unlocks staked bucket(s) and subsequently calls the 'IOTXClear' contract to record the debt.
* @param iotxsToRedeem The number of IOTXs to redeem must be a multiple of the accepted amount of redeeming base.
* @return burned the quantity of burned uniIOTXs.
*/
function redeem(uint iotxsToRedeem, uint deadline) external nonReentrant onlyValidTransaction(deadline) returns(uint burned) {
burned = _redeem(iotxsToRedeem);
}
/**
* ======================================================================================
*
* EXTERNAL FUNCTIONS FOR FEE_MANAGER
*
* ======================================================================================
*/
/**
* @dev This function handles manager reward in this way:
* 1. Mint uniIOTXs to the given recipient based on the given IOTX amount;
* 2. Shift the corresponding amount of accountedManagerReward to totalPending.
*/
function withdrawManagerFee(uint amount, address recipient) external nonReentrant onlyRole(ROLE_FEE_MANAGER) {
// Update the reward to help maintain a consistent exchange ratio
_updateReward();
require(amount <= accountedManagerReward, "USR006"); // Insufficient accounted manager reward
uint toMint = _convertIotxToUniIOTX(amount);
IUniIOTX(uniIOTX).mint(recipient, toMint);
accountedManagerReward -= amount;
totalPending += amount;
emit ManagerFeeWithdrawed(amount, toMint, recipient);
}
/**
* ======================================================================================
*
* INTERNAL FUNCTIONS
*
* ======================================================================================
*/
/**
* @dev This function mints uniIOTXs for the user based on their sent value and the latest exchange ratio.
*/
function _mint() internal returns (uint minted) {
uint toMint = _convertIotxToUniIOTX(msg.value);
IUniIOTX(uniIOTX).mint(msg.sender, toMint);
minted = toMint;
totalPending += msg.value;
emit Minted(msg.sender, minted);
}
/**
* @dev This function stakes IOTXs at the highest level, utilizing the maximum staking amount,
* without incorporating any merging behaviors.
*/
function _stakeAtTopLevel() internal {
// Determine values of stake params
uint level = sequenceLength-1;
(uint amount, uint count) = _getStakeAmountAndCount(level);
if (count == 0) return;
// Perform stake
_doStake(level, amount, count);
}
/**
* @dev This function stakes IOTXs at lower levels, using smaller staking amounts.
* It may incorporate merging behaviors if conditions are met.
*/
function _stakeAndMergeAtSubLevel() internal {
uint nextLevel = sequenceLength-2;
while (totalPending >= startAmount) {
nextLevel = _tryStake(nextLevel);
}
}
/**
* @dev This function verifies if the pending IOTXs are adequate for staking at the specified level.
* If adequate , it triggers the '_doStake' function to execute the actual staking.
* Otherwise, it will return a lower try level.
*/
function _tryStake(uint tryLevel) internal returns (uint nextLevel) {
// Verify if there is an adequate total of pending IOTX and ascertain the values of stake parameters.
(uint amount, uint count) = _getStakeAmountAndCount(tryLevel);
if (count == 0) {
return tryLevel-1;
}
uint stakedCount = tokenQueues[tryLevel].length;
if ((count+stakedCount) >= commonRatio) {
count = commonRatio-stakedCount;
}
// Perform stake
_doStake(tryLevel, amount, count);
// Merge tokens if possible
if (count+stakedCount == commonRatio) _merge(tryLevel);
return tryLevel;
}
/**
* @dev This function carries out the actual staking activity.
*/
function _doStake(uint level, uint amount, uint count) internal {
// Calculate total amount
uint totalAmount = amount * count;
// Call system stake service
uint firstTokenId = ISystemStaking(systemStaking).stake{value:totalAmount}(amount, stakeDuration, globalDelegate, count);
// Record minted & staked tokens
uint[] storage tq = tokenQueues[level];
for (uint j = 0; j < count; j++) {
tq.push(firstTokenId+j);
}
// Update fund status
totalPending -= totalAmount;
totalStaked += totalAmount;
accountedBalance -= totalAmount;
emit Staked(firstTokenId, amount, globalDelegate, count);
}
/**
* @dev This function computes and return the available staking amount and count at the specified level,
* considering the current total pending amount.
*/
function _getStakeAmountAndCount(uint level) internal view returns(uint amount, uint count) {
amount = startAmount * (commonRatio**level);
count = totalPending / amount;
}
/**
* @dev This function combines lower-level tokens into upper-level ones.
*/
function _merge(uint fromLevel) internal {
uint steps;
for (uint i = fromLevel; i < sequenceLength-1; i++) {
// Check merge condition
uint[] storage tq = tokenQueues[i];
if (tq.length < commonRatio) break;
// Call system merge service
// All tokens will be merged into the first token in tokenIdsToMerge
// Reference: https://github.com/iotexproject/iip13-contracts/blob/main/src/SystemStaking.sol#L302
ISystemStaking(systemStaking).merge(tq, stakeDuration);
// Move the merged tokens to upper queue
uint[] storage tqUpper = tokenQueues[i+1];
tqUpper.push(tq[0]);
delete tokenQueues[i];
steps++;
}
uint toLevel = fromLevel + steps;
uint mergeAmount = startAmount * (commonRatio**toLevel);
emit Merged(fromLevel, toLevel, mergeAmount);
}
/**
* @dev This function unlocks staked buckets and triggers the 'IOTXClear' contract to record corresponding debts.
*/
function _redeem(uint iotxsToRedeem) internal returns(uint burned) {
// Check redeem condition
require(iotxsToRedeem >= redeemAmountBase && iotxsToRedeem % redeemAmountBase == 0, "USR003"); // Invalid redeem amount
// Update the reward to help maintain a consistent exchange ratio
_updateReward();
// Burn uniIOTXs
uint toBurn = _convertIotxToUniIOTX(iotxsToRedeem);
IUniIOTX(uniIOTX).burnFrom(msg.sender, toBurn);
burned = toBurn;
totalStaked -= iotxsToRedeem;
// Extract tokens to unlock
uint [] memory tq = tokenQueues[sequenceLength-1];
uint count = iotxsToRedeem / redeemAmountBase;
uint[] memory tokenIdsToUnlock = new uint[](count);
for (uint i = 0; i < count; i++) {
tokenIdsToUnlock[i] = tq[redeemedTokenCount];
redeemedTokenCount++;
}
// Call system unlock service
ISystemStaking(systemStaking).unlock(tokenIdsToUnlock);
// Transfer unlocked tokens to IOTXClear contract
for (uint i = 0; i < count; i++) {
ISystemStaking(systemStaking).safeTransferFrom(address(this), address(iotxClear), tokenIdsToUnlock[i]);
}
// Record corresponding amount of debt with IOTXClear contract
IIOTXClear(iotxClear).joinDebt(msg.sender, iotxsToRedeem);
emit Redeemed(msg.sender, burned, tokenIdsToUnlock);
}
/**
* @dev This function calculates uniIOTX amount based on IOTX amount for mint and burn operation after updating
* rewards, aiming to keep the exchange ratio invariant to avoid user arbitrage.
* Reference: https://github.com/RockX-SG/stake/blob/main/doc/uniETH_ETH2_0_Liquid_Staking_Explained.pdf
*/
function _convertIotxToUniIOTX(uint amountIOTX) internal view returns (uint uniIOTXAmount) {
uint totalSupply = IUniIOTX(uniIOTX).totalSupply();
uint currentReserveAmt = _accountedReserve();
uniIOTXAmount = DEFAULT_EXCHANGE_RATIO * amountIOTX;
if (currentReserveAmt > 0) { // avert division overflow
uniIOTXAmount = totalSupply * amountIOTX / currentReserveAmt;
}
}
/**
* @dev This function computes and returns the exchange ratio of uniIOTX to IOTX, multiplied by 1e18.
*/
function _exchangeRatio() internal view returns (uint ratio) {
uint uniIOTXAmount = IUniIOTX(uniIOTX).totalSupply();
if (uniIOTXAmount == 0) {
return DEFAULT_EXCHANGE_RATIO * MULTIPLIER;
}
ratio = _currentReserve() * MULTIPLIER / uniIOTXAmount;
}
/**
* @dev This function computes and provides the current reserved IOTXs.
*/
function _currentReserve() internal view returns(uint) {
(uint pendingUserReward, ) = _calcPendingReward();
return totalPending + totalStaked + pendingUserReward;
}
/**
* @dev This function computes and provides the accounted reserved IOTXs.
*/
function _accountedReserve() internal view returns(uint) {
return totalPending + totalStaked;
}
/**
* @dev This function distributes recently accrued rewards from delegates among users and the manager.
* It also automatically reinvests the users' share into totalPending for upcoming staking activities.
*/
function _updateReward() internal {
uint reward = _syncReward();
if ( reward > 0 ){
uint userReward = _splitReward(reward);
_compoundReward(userReward);
emit RewardUpdated(reward);
}
}
/**
* @dev This function synchronizes the contract balance, calculating the increase in balance as the returned reward.
*/
function _syncReward() internal returns (uint reward) {
uint thisBalance = address(this).balance;
uint diff = thisBalance - accountedBalance;
accountedBalance = thisBalance;
reward = diff;
}
/**
* @dev This function divides the specified reward amount between users and the manager.
*/
function _splitReward(uint reward) internal returns (uint userReward) {
uint fee = reward * managerFeeShares / 1000;
accountedManagerReward += fee;
userReward = reward - fee;
accountedUserReward += userReward;
}
/**
* @dev This function incorporates the specified reward amount into the 'totalPending' value.
*/
function _compoundReward(uint amount) internal {
totalPending += amount;
}
/**
* @dev This function calculates the pending reward that has not yet been synchronized and accounted for.
*/
function _calcPendingReward() internal view returns(uint pendingUserReward, uint pendingManagerReward) {
uint pendingReward = address(this).balance - accountedBalance;
if (pendingReward > 0) {
pendingManagerReward = pendingReward * managerFeeShares / 1000;
return (pendingReward - pendingManagerReward, pendingManagerReward);
}
return (0, 0);
}
}
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Contract Creation Code
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