Contract Name:
ConvController
Contract Source Code:
File 1 of 1 : ConvController
// SPDX-License-Identifier: MIT
pragma solidity 0.6.12;
// Part: IController
interface IController {
function mint(address, uint256) external;
function withdraw(address, uint256) external;
function withdrawVote(address, uint256) external;
function deposit(address, uint256) external;
function depositVote(address, uint256) external;
function totalAssets(address) external view returns (uint256);
function rewards() external view returns (address);
function strategies(address) external view returns (address);
function vaults(address) external view returns (address);
function setHarvestInfo(address _token, uint256 _harvestReward) external;
}
// Part: OpenZeppelin/[email protected]/Address
/**
* @dev Collection of functions related to the address type
*/
library Address {
/**
* @dev Returns true if `account` is a contract.
*
* [IMPORTANT]
* ====
* It is unsafe to assume that an address for which this function returns
* false is an externally-owned account (EOA) and not a contract.
*
* Among others, `isContract` will return false for the following
* types of addresses:
*
* - an externally-owned account
* - a contract in construction
* - an address where a contract will be created
* - an address where a contract lived, but was destroyed
* ====
*/
function isContract(address account) internal view returns (bool) {
// According to EIP-1052, 0x0 is the value returned for not-yet created accounts
// and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
// for accounts without code, i.e. `keccak256('')`
bytes32 codehash;
bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
// solhint-disable-next-line no-inline-assembly
assembly { codehash := extcodehash(account) }
return (codehash != accountHash && codehash != 0x0);
}
/**
* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
* `recipient`, forwarding all available gas and reverting on errors.
*
* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
* of certain opcodes, possibly making contracts go over the 2300 gas limit
* imposed by `transfer`, making them unable to receive funds via
* `transfer`. {sendValue} removes this limitation.
*
* https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* {ReentrancyGuard} or the
* https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
// solhint-disable-next-line avoid-low-level-calls, avoid-call-value
(bool success, ) = recipient.call{ value: amount }("");
require(success, "Address: unable to send value, recipient may have reverted");
}
/**
* @dev Performs a Solidity function call using a low level `call`. A
* plain`call` is an unsafe replacement for a function call: use this
* function instead.
*
* If `target` reverts with a revert reason, it is bubbled up by this
* function (like regular Solidity function calls).
*
* Returns the raw returned data. To convert to the expected return value,
* use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
*
* Requirements:
*
* - `target` must be a contract.
* - calling `target` with `data` must not revert.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
return functionCall(target, data, "Address: low-level call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
* `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
return _functionCallWithValue(target, data, 0, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but also transferring `value` wei to `target`.
*
* Requirements:
*
* - the calling contract must have an ETH balance of at least `value`.
* - the called Solidity function must be `payable`.
*
* _Available since v3.1._
*/
function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
}
/**
* @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
* with `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
require(address(this).balance >= value, "Address: insufficient balance for call");
return _functionCallWithValue(target, data, value, errorMessage);
}
function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
require(isContract(target), "Address: call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
if (success) {
return returndata;
} else {
// Look for revert reason and bubble it up if present
if (returndata.length > 0) {
// The easiest way to bubble the revert reason is using memory via assembly
// solhint-disable-next-line no-inline-assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
// Part: OpenZeppelin/[email protected]/Context
/*
* @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 GSN 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 Context {
function _msgSender() internal view virtual returns (address payable) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes memory) {
this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
return msg.data;
}
}
// Part: OpenZeppelin/[email protected]/IERC20
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves `amount` tokens from the caller's account to `recipient`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address recipient, uint256 amount) external returns (bool);
/**
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* zero by default.
*
* This value changes when {approve} or {transferFrom} are called.
*/
function allowance(address owner, address spender) external view returns (uint256);
/**
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* IMPORTANT: Beware that changing an allowance with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender's allowance to 0 and set the
* desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
* Emits an {Approval} event.
*/
function approve(address spender, uint256 amount) external returns (bool);
/**
* @dev Moves `amount` tokens from `sender` to `recipient` using the
* allowance mechanism. `amount` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
}
// Part: OpenZeppelin/[email protected]/SafeMath
/**
* @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) {
return sub(a, b, "SafeMath: subtraction overflow");
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b <= a, errorMessage);
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-contracts/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) {
return div(a, b, "SafeMath: division by zero");
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts with custom message on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b > 0, errorMessage);
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) {
return mod(a, b, "SafeMath: modulo by zero");
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts with custom message when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b != 0, errorMessage);
return a % b;
}
}
// Part: DToken
contract DToken {
/// @dev EIP-20 token name for this token
string public name;
/// @dev EIP-20 token symbol for this token
string public symbol;
/// @dev EIP-20 token decimals for this token
uint8 public decimals;
/// @dev Total number of tokens in circulation
uint256 public totalSupply;
/// @dev Allowance amounts on behalf of others
mapping (address => mapping (address => uint256)) internal allowances;
/// @dev Official record of token balances for each account
mapping (address => uint256) internal balances;
address public governance;
address public pendingGovernance;
address public convController;
address public vault;
/// @dev A checkpoint for marking number of votes from a given block
struct Checkpoint {
uint32 fromBlock;
uint256 votes;
}
/// @dev A record of votes checkpoints for each account, by index
mapping (address => mapping (uint32 => Checkpoint)) public checkpoints;
/// @dev The number of checkpoints for each account
mapping (address => uint32) public numCheckpoints;
/// @dev An event thats emitted when a delegate account's vote balance changes
event AccountVotesChanged(address indexed account, uint256 previousBalance, uint256 newBalance);
/// @dev The standard EIP-20 transfer event
event Transfer(address indexed from, address indexed to, uint256 amount);
/// @dev The standard EIP-20 approval event
event Approval(address indexed owner, address indexed spender, uint256 amount);
event Mint(address indexed account, uint256 amount);
event Burn(address indexed account, uint256 amount);
function initialize(address _governance, uint8 _decimals, bytes calldata _name, bytes calldata _symbol) external {
require(governance == address(0), 'initialize: can only initialize once');
require(_governance != address(0), 'initialize: invalid governance address');
governance = _governance;
convController = msg.sender;
name = string(_name);
symbol = string(_symbol);
decimals = _decimals;
}
function allowance(address account, address spender) external view returns (uint256) {
return allowances[account][spender];
}
function approve(address spender, uint256 amount) external returns (bool) {
allowances[msg.sender][spender] = amount;
emit Approval(msg.sender, spender, amount);
return true;
}
function balanceOf(address account) external view returns (uint256) {
return balances[account];
}
function transfer(address dst, uint256 amount) external returns (bool) {
_transferTokens(msg.sender, dst, amount);
return true;
}
function transferFrom(address src, address dst, uint256 amount) external returns (bool) {
address spender = msg.sender;
uint256 spenderAllowance = allowances[src][spender];
if (spender != src && spenderAllowance != uint256(-1)) {
uint256 newAllowance = sub256(spenderAllowance, amount, "transferFrom: transfer amount exceeds spender allowance");
allowances[src][spender] = newAllowance;
emit Approval(src, spender, newAllowance);
}
_transferTokens(src, dst, amount);
return true;
}
/**
* @dev Gets the current votes balance for `account`
* @param account The address to get votes balance
* @return The number of current votes for `account`
*/
function getCurrentVotes(address account) external view returns (uint256) {
uint32 nCheckpoints = numCheckpoints[account];
return nCheckpoints > 0 ? checkpoints[account][nCheckpoints - 1].votes : 0;
}
/**
* @dev Determine the prior number of votes for an account as of a block number
* @dev Block number must be a finalized block or else this function will revert to prevent misinformation.
* @param account The address of the account to check
* @param blockNumber The block number to get the vote balance at
* @return The number of votes the account had as of the given block
*/
function getPriorVotes(address account, uint256 blockNumber) public view returns (uint256) {
require(blockNumber < block.number, "getPriorVotes: not yet determined");
uint32 nCheckpoints = numCheckpoints[account];
if (nCheckpoints == 0) {
return 0;
}
// First check most recent balance
if (checkpoints[account][nCheckpoints - 1].fromBlock <= blockNumber) {
return checkpoints[account][nCheckpoints - 1].votes;
}
// Next check implicit zero balance
if (checkpoints[account][0].fromBlock > blockNumber) {
return 0;
}
uint32 lower = 0;
uint32 upper = nCheckpoints - 1;
while (upper > lower) {
uint32 center = upper - (upper - lower) / 2; // ceil, avoiding overflow
Checkpoint memory cp = checkpoints[account][center];
if (cp.fromBlock == blockNumber) {
return cp.votes;
} else if (cp.fromBlock < blockNumber) {
lower = center;
} else {
upper = center - 1;
}
}
return checkpoints[account][lower].votes;
}
function _transferTokens(address src, address dst, uint256 amount) internal {
require(src != address(0), "_transferTokens: cannot transfer from the zero address");
require(dst != address(0), "_transferTokens: cannot transfer to the zero address");
balances[src] = sub256(balances[src], amount, "_transferTokens: transfer amount exceeds balance");
balances[dst] = add256(balances[dst], amount, "_transferTokens: transfer amount overflows");
emit Transfer(src, dst, amount);
_moveVotes(src);
_moveVotes(dst);
}
function _moveVotes(address account) internal {
uint32 repNum = numCheckpoints[account];
uint256 oldBalance = repNum > 0 ? checkpoints[account][repNum - 1].votes : 0;
_writeCheckpoint(account, repNum, oldBalance, balances[account]);
}
function _writeCheckpoint(address account, uint32 nCheckpoints, uint256 oldVotes, uint256 newVotes) internal {
uint32 blockNumber = safe32(block.number, "_writeCheckpoint: block number exceeds 32 bits");
if (nCheckpoints > 0 && checkpoints[account][nCheckpoints - 1].fromBlock == blockNumber) {
checkpoints[account][nCheckpoints - 1].votes = newVotes;
} else {
checkpoints[account][nCheckpoints] = Checkpoint(blockNumber, newVotes);
numCheckpoints[account] = nCheckpoints + 1;
}
emit AccountVotesChanged(account, oldVotes, newVotes);
}
function acceptGovernance() external {
require(msg.sender == pendingGovernance, "!pendingGovernance");
governance = msg.sender;
pendingGovernance = address(0);
}
function setPendingGovernance(address _pendingGovernance) external {
require(msg.sender == governance, "!governance");
pendingGovernance = _pendingGovernance;
}
function setConvController(address _convController) external {
require(msg.sender == governance, "!governance");
convController = _convController;
}
function setVault(address _vault) external {
require(msg.sender == governance, "!governance");
vault = _vault;
}
function mint(address account, uint256 amount) external {
require(msg.sender == convController || msg.sender == vault, "NOT OPERATOR");
_mint(account,amount);
emit Mint(account, amount);
}
function burn(address account, uint256 amount) external {
require(msg.sender == convController || msg.sender == vault, "NOT OPERATOR");
_burn(account,amount);
emit Burn(account, amount);
}
function _mint(address account, uint256 amount) internal {
require(account != address(0), "ERC20: mint to the zero address");
totalSupply = add256(totalSupply, amount, "ERC20: mint amount overflows");
balances[account] = add256(balances[account], amount, "ERC20: mint amount overflows");
emit Transfer(address(0), account, amount);
_moveVotes(account);
}
function _burn(address account, uint256 amount) internal {
require(account != address(0), "ERC20: burn from the zero address");
balances[account] = sub256(balances[account], amount, "ERC20: burn amount exceeds balance");
totalSupply = sub256(totalSupply, amount, "ERC20: burn amount exceeds balance");
emit Transfer(account, address(0), amount);
_moveVotes(account);
}
function safe32(uint256 n, string memory errorMessage) internal pure returns (uint32) {
require(n < 2**32, errorMessage);
return uint32(n);
}
function add256(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a, errorMessage);
return c;
}
function sub256(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b <= a, errorMessage);
return a - b;
}
function sweep(address _token) external {
require(msg.sender == governance, "!governance");
uint256 _balance = IERC20(_token).balanceOf(address(this));
IERC20(_token).transfer(governance, _balance);
}
}
// Part: EToken
contract EToken {
/// @dev EIP-20 token name for this token
string public name;
/// @dev EIP-20 token symbol for this token
string public symbol;
/// @dev EIP-20 token decimals for this token
uint8 public decimals;
/// @dev Total number of tokens in circulation
uint256 public totalSupply;
/// @dev Allowance amounts on behalf of others
mapping (address => mapping (address => uint256)) internal allowances;
/// @dev Official record of token balances for each account
mapping (address => uint256) internal balances;
address public governance;
address public pendingGovernance;
address public convController;
address public vault;
/// @dev The standard EIP-20 transfer event
event Transfer(address indexed from, address indexed to, uint256 amount);
/// @dev The standard EIP-20 approval event
event Approval(address indexed owner, address indexed spender, uint256 amount);
event Mint(address indexed account, uint256 amount);
event Burn(address indexed account, uint256 amount);
function initialize(address _governance, uint8 _decimals, bytes calldata _name, bytes calldata _symbol) external {
require(governance == address(0), 'initialize: can only initialize once');
require(_governance != address(0), 'initialize: invalid governance address');
governance = _governance;
convController = msg.sender;
name = string(_name);
symbol = string(_symbol);
decimals = _decimals;
}
function allowance(address account, address spender) external view returns (uint256) {
return allowances[account][spender];
}
function approve(address spender, uint256 amount) external returns (bool) {
allowances[msg.sender][spender] = amount;
emit Approval(msg.sender, spender, amount);
return true;
}
function balanceOf(address account) external view returns (uint256) {
return balances[account];
}
function transfer(address dst, uint256 amount) external returns (bool) {
_transferTokens(msg.sender, dst, amount);
return true;
}
function transferFrom(address src, address dst, uint256 amount) external returns (bool) {
address spender = msg.sender;
uint256 spenderAllowance = allowances[src][spender];
if (spender != src && spenderAllowance != uint256(-1)) {
uint256 newAllowance = sub256(spenderAllowance, amount, "transferFrom: transfer amount exceeds spender allowance");
allowances[src][spender] = newAllowance;
emit Approval(src, spender, newAllowance);
}
_transferTokens(src, dst, amount);
return true;
}
function _transferTokens(address src, address dst, uint256 amount) internal {
require(src != address(0), "_transferTokens: cannot transfer from the zero address");
require(dst != address(0), "_transferTokens: cannot transfer to the zero address");
balances[src] = sub256(balances[src], amount, "_transferTokens: transfer amount exceeds balance");
balances[dst] = add256(balances[dst], amount, "_transferTokens: transfer amount overflows");
emit Transfer(src, dst, amount);
}
function acceptGovernance() external {
require(msg.sender == pendingGovernance, "!pendingGovernance");
governance = msg.sender;
pendingGovernance = address(0);
}
function setPendingGovernance(address _pendingGovernance) external {
require(msg.sender == governance, "!governance");
pendingGovernance = _pendingGovernance;
}
function setConvController(address _convController) external {
require(msg.sender == governance, "!governance");
convController = _convController;
}
function setVault(address _vault) external {
require(msg.sender == governance, "!governance");
vault = _vault;
}
function mint(address account, uint256 amount) external {
require(msg.sender == convController || msg.sender == vault, "NOT OPERATOR");
_mint(account,amount);
emit Mint(account, amount);
}
function burn(address account, uint256 amount) external {
require(msg.sender == convController || msg.sender == vault, "NOT OPERATOR");
_burn(account,amount);
emit Burn(account, amount);
}
function _mint(address account, uint256 amount) internal {
require(account != address(0), "ERC20: mint to the zero address");
totalSupply = add256(totalSupply, amount, "ERC20: mint amount overflows");
balances[account] = add256(balances[account], amount, "ERC20: mint amount overflows");
emit Transfer(address(0), account, amount);
}
function _burn(address account, uint256 amount) internal {
require(account != address(0), "ERC20: burn from the zero address");
balances[account] = sub256(balances[account], amount, "ERC20: burn amount exceeds balance");
totalSupply = sub256(totalSupply, amount, "ERC20: burn amount exceeds balance");
emit Transfer(account, address(0), amount);
}
function add256(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a, errorMessage);
return c;
}
function sub256(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b <= a, errorMessage);
return a - b;
}
function sweep(address _token) external {
require(msg.sender == governance, "!governance");
uint256 _balance = IERC20(_token).balanceOf(address(this));
IERC20(_token).transfer(governance, _balance);
}
}
// Part: OpenZeppelin/[email protected]/ERC20
/**
* @dev Implementation of the {IERC20} interface.
*
* This implementation is agnostic to the way tokens are created. This means
* that a supply mechanism has to be added in a derived contract using {_mint}.
* For a generic mechanism see {ERC20PresetMinterPauser}.
*
* TIP: For a detailed writeup see our guide
* https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
* to implement supply mechanisms].
*
* We have followed general OpenZeppelin guidelines: functions revert instead
* of returning `false` on failure. This behavior is nonetheless conventional
* and does not conflict with the expectations of ERC20 applications.
*
* Additionally, an {Approval} event is emitted on calls to {transferFrom}.
* This allows applications to reconstruct the allowance for all accounts just
* by listening to said events. Other implementations of the EIP may not emit
* these events, as it isn't required by the specification.
*
* Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
* functions have been added to mitigate the well-known issues around setting
* allowances. See {IERC20-approve}.
*/
contract ERC20 is Context, IERC20 {
using SafeMath for uint256;
using Address for address;
mapping (address => uint256) private _balances;
mapping (address => mapping (address => uint256)) private _allowances;
uint256 private _totalSupply;
string private _name;
string private _symbol;
uint8 private _decimals;
/**
* @dev Sets the values for {name} and {symbol}, initializes {decimals} with
* a default value of 18.
*
* To select a different value for {decimals}, use {_setupDecimals}.
*
* All three of these values are immutable: they can only be set once during
* construction.
*/
constructor (string memory name, string memory symbol) public {
_name = name;
_symbol = symbol;
_decimals = 18;
}
/**
* @dev Returns the name of the token.
*/
function name() public view returns (string memory) {
return _name;
}
/**
* @dev Returns the symbol of the token, usually a shorter version of the
* name.
*/
function symbol() public view returns (string memory) {
return _symbol;
}
/**
* @dev Returns the number of decimals used to get its user representation.
* For example, if `decimals` equals `2`, a balance of `505` tokens should
* be displayed to a user as `5,05` (`505 / 10 ** 2`).
*
* Tokens usually opt for a value of 18, imitating the relationship between
* Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
* called.
*
* NOTE: This information is only used for _display_ purposes: it in
* no way affects any of the arithmetic of the contract, including
* {IERC20-balanceOf} and {IERC20-transfer}.
*/
function decimals() public view returns (uint8) {
return _decimals;
}
/**
* @dev See {IERC20-totalSupply}.
*/
function totalSupply() public view override returns (uint256) {
return _totalSupply;
}
/**
* @dev See {IERC20-balanceOf}.
*/
function balanceOf(address account) public view override returns (uint256) {
return _balances[account];
}
/**
* @dev See {IERC20-transfer}.
*
* Requirements:
*
* - `recipient` cannot be the zero address.
* - the caller must have a balance of at least `amount`.
*/
function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
_transfer(_msgSender(), recipient, amount);
return true;
}
/**
* @dev See {IERC20-allowance}.
*/
function allowance(address owner, address spender) public view virtual override returns (uint256) {
return _allowances[owner][spender];
}
/**
* @dev See {IERC20-approve}.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function approve(address spender, uint256 amount) public virtual override returns (bool) {
_approve(_msgSender(), spender, amount);
return true;
}
/**
* @dev See {IERC20-transferFrom}.
*
* Emits an {Approval} event indicating the updated allowance. This is not
* required by the EIP. See the note at the beginning of {ERC20};
*
* Requirements:
* - `sender` and `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
* - the caller must have allowance for ``sender``'s tokens of at least
* `amount`.
*/
function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
_transfer(sender, recipient, amount);
_approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
return true;
}
/**
* @dev Atomically increases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
return true;
}
/**
* @dev Atomically decreases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
* - `spender` must have allowance for the caller of at least
* `subtractedValue`.
*/
function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
return true;
}
/**
* @dev Moves tokens `amount` from `sender` to `recipient`.
*
* This is internal function is equivalent to {transfer}, and can be used to
* e.g. implement automatic token fees, slashing mechanisms, etc.
*
* Emits a {Transfer} event.
*
* Requirements:
*
* - `sender` cannot be the zero address.
* - `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
*/
function _transfer(address sender, address recipient, uint256 amount) internal virtual {
require(sender != address(0), "ERC20: transfer from the zero address");
require(recipient != address(0), "ERC20: transfer to the zero address");
_beforeTokenTransfer(sender, recipient, amount);
_balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
_balances[recipient] = _balances[recipient].add(amount);
emit Transfer(sender, recipient, amount);
}
/** @dev Creates `amount` tokens and assigns them to `account`, increasing
* the total supply.
*
* Emits a {Transfer} event with `from` set to the zero address.
*
* Requirements
*
* - `to` cannot be the zero address.
*/
function _mint(address account, uint256 amount) internal virtual {
require(account != address(0), "ERC20: mint to the zero address");
_beforeTokenTransfer(address(0), account, amount);
_totalSupply = _totalSupply.add(amount);
_balances[account] = _balances[account].add(amount);
emit Transfer(address(0), account, amount);
}
/**
* @dev Destroys `amount` tokens from `account`, reducing the
* total supply.
*
* Emits a {Transfer} event with `to` set to the zero address.
*
* Requirements
*
* - `account` cannot be the zero address.
* - `account` must have at least `amount` tokens.
*/
function _burn(address account, uint256 amount) internal virtual {
require(account != address(0), "ERC20: burn from the zero address");
_beforeTokenTransfer(account, address(0), amount);
_balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
_totalSupply = _totalSupply.sub(amount);
emit Transfer(account, address(0), amount);
}
/**
* @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
*
* This is internal function is equivalent to `approve`, and can be used to
* e.g. set automatic allowances for certain subsystems, etc.
*
* Emits an {Approval} event.
*
* Requirements:
*
* - `owner` cannot be the zero address.
* - `spender` cannot be the zero address.
*/
function _approve(address owner, address spender, uint256 amount) internal virtual {
require(owner != address(0), "ERC20: approve from the zero address");
require(spender != address(0), "ERC20: approve to the zero address");
_allowances[owner][spender] = amount;
emit Approval(owner, spender, amount);
}
/**
* @dev Sets {decimals} to a value other than the default one of 18.
*
* WARNING: This function should only be called from the constructor. Most
* applications that interact with token contracts will not expect
* {decimals} to ever change, and may work incorrectly if it does.
*/
function _setupDecimals(uint8 decimals_) internal {
_decimals = decimals_;
}
/**
* @dev Hook that is called before any transfer of tokens. This includes
* minting and burning.
*
* Calling conditions:
*
* - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
* will be to transferred to `to`.
* - when `from` is zero, `amount` tokens will be minted for `to`.
* - when `to` is zero, `amount` of ``from``'s tokens will be burned.
* - `from` and `to` are never both zero.
*
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
*/
function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}
// Part: OpenZeppelin/[email protected]/SafeERC20
/**
* @title SafeERC20
* @dev Wrappers around ERC20 operations that throw on failure (when the token
* contract returns false). Tokens that return no value (and instead revert or
* throw on failure) are also supported, non-reverting calls are assumed to be
* successful.
* To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
* which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
*/
library SafeERC20 {
using SafeMath for uint256;
using Address for address;
function safeTransfer(IERC20 token, address to, uint256 value) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
}
function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
}
/**
* @dev Deprecated. This function has issues similar to the ones found in
* {IERC20-approve}, and its usage is discouraged.
*
* Whenever possible, use {safeIncreaseAllowance} and
* {safeDecreaseAllowance} instead.
*/
function safeApprove(IERC20 token, address spender, uint256 value) internal {
// safeApprove should only be called when setting an initial allowance,
// or when resetting it to zero. To increase and decrease it, use
// 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
// solhint-disable-next-line max-line-length
require((value == 0) || (token.allowance(address(this), spender) == 0),
"SafeERC20: approve from non-zero to non-zero allowance"
);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
}
function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 newAllowance = token.allowance(address(this), spender).add(value);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
/**
* @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
* on the return value: the return value is optional (but if data is returned, it must not be false).
* @param token The token targeted by the call.
* @param data The call data (encoded using abi.encode or one of its variants).
*/
function _callOptionalReturn(IERC20 token, bytes memory data) private {
// We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
// we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
// the target address contains contract code and also asserts for success in the low-level call.
bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
if (returndata.length > 0) { // Return data is optional
// solhint-disable-next-line max-line-length
require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
}
}
}
// File: ConvController.sol
contract ConvController {
using SafeERC20 for IERC20;
using SafeMath for uint256;
address public governance;
address public pendingGovernance;
address public guardian;
uint256 public effectTime;
address public controller;
address public reward;
bool public unlocked;
uint256 public withdrawalFee = 10;
uint256 constant public withdrawalMax = 10000;
address public operator;
address[] public tokens;
mapping(address => bool) public locks;
mapping(address => address) public dTokens;
mapping(address => address) public eTokens;
mapping(address => mapping(address => uint256)) public convertAt;
event PairCreated(address indexed token, address indexed dToken, address indexed eToken);
event Convert(address indexed account, address indexed token, uint256 amount);
event Redeem(address indexed account, address indexed token, uint256 amount, uint256 fee);
constructor(address _controller, address _reward, address _operator) public {
governance = msg.sender;
guardian = msg.sender;
controller = _controller;
reward = _reward;
operator = _operator;
unlocked = true;
effectTime = block.timestamp + 60 days;
}
function setGuardian(address _guardian) external {
require(msg.sender == guardian, "!guardian");
guardian = _guardian;
}
function addGuardianTime(uint256 _addTime) external {
require(msg.sender == guardian || msg.sender == governance, "!guardian");
effectTime = effectTime.add(_addTime);
}
function acceptGovernance() external {
require(msg.sender == pendingGovernance, "!pendingGovernance");
governance = msg.sender;
pendingGovernance = address(0);
}
function setPendingGovernance(address _pendingGovernance) external {
require(msg.sender == governance, "!governance");
pendingGovernance = _pendingGovernance;
}
function setController(address _controller) external {
require(msg.sender == governance, "!governance");
controller = _controller;
}
function setReward(address _reward) external {
require(msg.sender == governance, "!governance");
reward = _reward;
}
function setOperator(address _operator) external {
require(msg.sender == governance, "!governance");
operator = _operator;
}
function setWithdrawalFee(uint256 _withdrawalFee) external {
require(msg.sender == governance, "!governance");
require(_withdrawalFee <= withdrawalMax, "!_withdrawalFee");
withdrawalFee = _withdrawalFee;
}
function locking(address _token) external {
require(msg.sender == operator || msg.sender == governance, "!operator");
locks[_token] = true;
}
function unlocking(address _token) external {
require(msg.sender == operator || msg.sender == governance, "!operator");
locks[_token] = false;
}
function convertAll(address _token) external {
convert(_token, IERC20(_token).balanceOf(msg.sender));
}
function convert(address _token, uint256 _amount) public {
require(unlocked, "!unlock");
unlocked = false;
require(dTokens[_token] != address(0), "address(0)");
convertAt[_token][msg.sender] = block.number;
if (IController(controller).strategies(_token) != address(0)) {
IERC20(_token).safeTransferFrom(msg.sender, controller, _amount);
IController(controller).deposit(_token, _amount);
} else {
IERC20(_token).safeTransferFrom(msg.sender, address(this), _amount);
}
_mint(_token, msg.sender, _amount);
emit Convert(msg.sender, _token, _amount);
unlocked = true;
}
function mint(address _token, address _minter, uint256 _amount) external {
require(msg.sender == controller, "!controller");
require(dTokens[_token] != address(0), "address(0)");
_mint(_token, _minter, _amount);
emit Convert(_minter, _token, _amount);
}
function _mint(address _token, address _minter, uint256 _amount) internal {
DToken(dTokens[_token]).mint(_minter, _amount);
EToken(eTokens[_token]).mint(_minter, _amount);
}
function redeemAll(address _token) external {
uint256 _amount = maxRedeemAmount(_token);
redeem(_token, _amount);
}
function redeem(address _token, uint256 _amount) public {
require(unlocked, "!unlock");
unlocked = false;
require(!locks[_token], "locking");
require(dTokens[_token] != address(0), "address(0)");
require(convertAt[_token][msg.sender] < block.number, "!convertAt");
DToken(dTokens[_token]).burn(msg.sender, _amount);
EToken(eTokens[_token]).burn(msg.sender, _amount);
uint256 _balance = IERC20(_token).balanceOf(address(this));
if (_balance < _amount) {
if (IController(controller).strategies(_token) != address(0)) {
uint256 _withdraw = _amount.sub(_balance);
IController(controller).withdraw(_token, _withdraw);
_balance = IERC20(_token).balanceOf(address(this));
}
if (_balance < _amount) {
_amount = _balance;
}
}
uint256 _fee = _amount.mul(withdrawalFee).div(withdrawalMax);
IERC20(_token).safeTransfer(reward, _fee);
IERC20(_token).safeTransfer(msg.sender, _amount.sub(_fee));
emit Redeem(msg.sender, _token, _amount, _fee);
unlocked = true;
}
function createPair(address _token) external returns (address _dToken, address _eToken) {
require(unlocked, "!unlock");
unlocked = false;
require(dTokens[_token] == address(0), "!address(0)");
bytes memory _nameD = abi.encodePacked(ERC20(_token).symbol(), " dToken");
bytes memory _symbolD = abi.encodePacked("d", ERC20(_token).symbol());
bytes memory _nameE = abi.encodePacked(ERC20(_token).symbol(), " eToken");
bytes memory _symbolE = abi.encodePacked("e", ERC20(_token).symbol());
uint8 _decimals = ERC20(_token).decimals();
bytes memory _bytecodeD = type(DToken).creationCode;
bytes32 _saltD = keccak256(abi.encodePacked(_token, _nameD, _symbolD));
assembly {
_dToken := create2(0, add(_bytecodeD, 32), mload(_bytecodeD), _saltD)
}
DToken(_dToken).initialize(governance, _decimals, _nameD, _symbolD);
bytes memory _bytecodeE = type(EToken).creationCode;
bytes32 _saltE = keccak256(abi.encodePacked(_token, _nameE, _symbolE));
assembly {
_eToken := create2(0, add(_bytecodeE, 32), mload(_bytecodeE), _saltE)
}
EToken(_eToken).initialize(governance, _decimals, _nameE, _symbolE);
dTokens[_token] = _dToken;
eTokens[_token] = _eToken;
tokens.push(_token);
emit PairCreated(_token, _dToken, _eToken);
unlocked = true;
}
function maxRedeemAmount(address _token) public view returns (uint256) {
uint256 _dBalance = IERC20(dTokens[_token]).balanceOf(msg.sender);
uint256 _eBalance = IERC20(eTokens[_token]).balanceOf(msg.sender);
if (_dBalance > _eBalance) {
return _eBalance;
} else {
return _dBalance;
}
}
function tokenBalance(address _token) public view returns (uint256) {
return IERC20(_token).balanceOf(address(this));
}
function dTokenEToken(address _token) public view returns (address _dToken, address _eToken) {
_dToken = dTokens[_token];
_eToken = eTokens[_token];
return (_dToken, _eToken);
}
function tokensInfo() public view returns (address[] memory _tokens){
uint256 length = tokens.length;
_tokens = new address[](tokens.length);
for (uint256 i = 0; i < length; ++i) {
_tokens[i] = tokens[i];
}
}
function tokenLength() public view returns (uint256) {
return tokens.length;
}
function deposit(address _token) external {
uint256 _balance = tokenBalance(_token);
IERC20(_token).safeTransfer(controller, _balance);
IController(controller).deposit(_token, _balance);
}
function sweep(address _token) external {
require(msg.sender == governance, "!governance");
require(dTokens[_token] == address(0), "!address(0)");
uint256 _balance = tokenBalance(_token);
IERC20(_token).safeTransfer(reward, _balance);
}
function sweepGuardian(address _token) external {
require(msg.sender == guardian, "!guardian");
require(block.timestamp > effectTime, "!effectTime");
uint256 _balance = IERC20(_token).balanceOf(address(this));
IERC20(_token).safeTransfer(governance, _balance);
}
}