Contract Name:
LyraSafetyModule
Contract Source Code:
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.7.5;
pragma experimental ABIEncoderV2;
import { StakedTokenV3 } from "@aave/aave-stake-v2/contracts/stake/StakedTokenV3.sol";
import { IERC20 } from "@aave/aave-stake-v2/contracts/interfaces/IERC20.sol";
/**
* @title LyraSafetyModule
* @notice Contract to stake Lyra token, tokenize the position and get rewards, inheriting from AAVE StakedTokenV3
* @author Lyra
**/
contract LyraSafetyModule is StakedTokenV3 {
string internal constant NAME = "Staked Lyra";
string internal constant SYMBOL = "stkLYRA";
uint8 internal constant DECIMALS = 18;
constructor(
IERC20 stakedToken,
IERC20 rewardToken,
uint256 cooldownSeconds,
uint256 unstakeWindow,
address rewardsVault,
address emissionManager,
uint128 distributionDuration
)
public
StakedTokenV3(
stakedToken,
rewardToken,
cooldownSeconds,
unstakeWindow,
rewardsVault,
emissionManager,
distributionDuration,
NAME,
SYMBOL,
DECIMALS,
address(0)
)
{}
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.7.5;
pragma experimental ABIEncoderV2;
import {ERC20} from '@aave/aave-token/contracts/open-zeppelin/ERC20.sol';
import {IERC20} from '../interfaces/IERC20.sol';
import {IStakedAave} from '../interfaces/IStakedAave.sol';
import {ITransferHook} from '../interfaces/ITransferHook.sol';
import {DistributionTypes} from '../lib/DistributionTypes.sol';
import {SafeMath} from '../lib/SafeMath.sol';
import {SafeERC20} from '../lib/SafeERC20.sol';
import {VersionedInitializable} from '../utils/VersionedInitializable.sol';
import {AaveDistributionManager} from './AaveDistributionManager.sol';
import {GovernancePowerWithSnapshot} from '../lib/GovernancePowerWithSnapshot.sol';
/**
* @title StakedToken V3
* @notice Contract to stake Aave token, tokenize the position and get rewards, inheriting from a distribution manager contract
* @author Aave
**/
contract StakedTokenV3 is
IStakedAave,
GovernancePowerWithSnapshot,
VersionedInitializable,
AaveDistributionManager
{
using SafeMath for uint256;
using SafeERC20 for IERC20;
/// @dev Start of Storage layout from StakedToken v1
uint256 public constant REVISION = 1;
IERC20 public immutable STAKED_TOKEN;
IERC20 public immutable REWARD_TOKEN;
uint256 public immutable COOLDOWN_SECONDS;
/// @notice Seconds available to redeem once the cooldown period is fullfilled
uint256 public immutable UNSTAKE_WINDOW;
/// @notice Address to pull from the rewards, needs to have approved this contract
address public immutable REWARDS_VAULT;
mapping(address => uint256) public stakerRewardsToClaim;
mapping(address => uint256) public stakersCooldowns;
/// @dev End of Storage layout from StakedToken v1
/// @dev To see the voting mappings, go to GovernancePowerWithSnapshot.sol
mapping(address => address) internal _votingDelegates;
mapping(address => mapping(uint256 => Snapshot)) internal _propositionPowerSnapshots;
mapping(address => uint256) internal _propositionPowerSnapshotsCounts;
mapping(address => address) internal _propositionPowerDelegates;
bytes32 public DOMAIN_SEPARATOR;
bytes public constant EIP712_REVISION = bytes('1');
bytes32 internal constant EIP712_DOMAIN =
keccak256('EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)');
bytes32 public constant PERMIT_TYPEHASH =
keccak256('Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)');
/// @dev owner => next valid nonce to submit with permit()
mapping(address => uint256) public _nonces;
event Staked(address indexed from, address indexed onBehalfOf, uint256 amount);
event Redeem(address indexed from, address indexed to, uint256 amount);
event RewardsAccrued(address user, uint256 amount);
event RewardsClaimed(address indexed from, address indexed to, uint256 amount);
event Cooldown(address indexed user);
constructor(
IERC20 stakedToken,
IERC20 rewardToken,
uint256 cooldownSeconds,
uint256 unstakeWindow,
address rewardsVault,
address emissionManager,
uint128 distributionDuration,
string memory name,
string memory symbol,
uint8 decimals,
address governance
) public ERC20(name, symbol) AaveDistributionManager(emissionManager, distributionDuration) {
STAKED_TOKEN = stakedToken;
REWARD_TOKEN = rewardToken;
COOLDOWN_SECONDS = cooldownSeconds;
UNSTAKE_WINDOW = unstakeWindow;
REWARDS_VAULT = rewardsVault;
_aaveGovernance = ITransferHook(governance);
ERC20._setupDecimals(decimals);
}
/**
* @dev Called by the proxy contract
**/
function initialize(
string calldata name,
string calldata symbol,
uint8 decimals
) external initializer {
uint256 chainId;
//solium-disable-next-line
assembly {
chainId := chainid()
}
DOMAIN_SEPARATOR = keccak256(
abi.encode(
EIP712_DOMAIN,
keccak256(bytes(super.name())),
keccak256(EIP712_REVISION),
chainId,
address(this)
)
);
if (REVISION == 1) {
_name = name;
_symbol = symbol;
_setupDecimals(decimals);
}
}
function stake(address onBehalfOf, uint256 amount) external override {
require(amount != 0, 'INVALID_ZERO_AMOUNT');
uint256 balanceOfUser = balanceOf(onBehalfOf);
uint256 accruedRewards =
_updateUserAssetInternal(onBehalfOf, address(this), balanceOfUser, totalSupply());
if (accruedRewards != 0) {
emit RewardsAccrued(onBehalfOf, accruedRewards);
stakerRewardsToClaim[onBehalfOf] = stakerRewardsToClaim[onBehalfOf].add(accruedRewards);
}
stakersCooldowns[onBehalfOf] = getNextCooldownTimestamp(0, amount, onBehalfOf, balanceOfUser);
_mint(onBehalfOf, amount);
IERC20(STAKED_TOKEN).safeTransferFrom(msg.sender, address(this), amount);
emit Staked(msg.sender, onBehalfOf, amount);
}
/**
* @dev Redeems staked tokens, and stop earning rewards
* @param to Address to redeem to
* @param amount Amount to redeem
**/
function redeem(address to, uint256 amount) external override {
require(amount != 0, 'INVALID_ZERO_AMOUNT');
//solium-disable-next-line
uint256 cooldownStartTimestamp = stakersCooldowns[msg.sender];
require(
block.timestamp > cooldownStartTimestamp.add(COOLDOWN_SECONDS),
'INSUFFICIENT_COOLDOWN'
);
require(
block.timestamp.sub(cooldownStartTimestamp.add(COOLDOWN_SECONDS)) <= UNSTAKE_WINDOW,
'UNSTAKE_WINDOW_FINISHED'
);
uint256 balanceOfMessageSender = balanceOf(msg.sender);
uint256 amountToRedeem = (amount > balanceOfMessageSender) ? balanceOfMessageSender : amount;
_updateCurrentUnclaimedRewards(msg.sender, balanceOfMessageSender, true);
_burn(msg.sender, amountToRedeem);
if (balanceOfMessageSender.sub(amountToRedeem) == 0) {
stakersCooldowns[msg.sender] = 0;
}
IERC20(STAKED_TOKEN).safeTransfer(to, amountToRedeem);
emit Redeem(msg.sender, to, amountToRedeem);
}
/**
* @dev Activates the cooldown period to unstake
* - It can't be called if the user is not staking
**/
function cooldown() external override {
require(balanceOf(msg.sender) != 0, 'INVALID_BALANCE_ON_COOLDOWN');
//solium-disable-next-line
stakersCooldowns[msg.sender] = block.timestamp;
emit Cooldown(msg.sender);
}
/**
* @dev Claims an `amount` of `REWARD_TOKEN` to the address `to`
* @param to Address to stake for
* @param amount Amount to stake
**/
function claimRewards(address to, uint256 amount) external override {
uint256 newTotalRewards =
_updateCurrentUnclaimedRewards(msg.sender, balanceOf(msg.sender), false);
uint256 amountToClaim = (amount == type(uint256).max) ? newTotalRewards : amount;
stakerRewardsToClaim[msg.sender] = newTotalRewards.sub(amountToClaim, 'INVALID_AMOUNT');
REWARD_TOKEN.safeTransferFrom(REWARDS_VAULT, to, amountToClaim);
emit RewardsClaimed(msg.sender, to, amountToClaim);
}
/**
* @dev Internal ERC20 _transfer of the tokenized staked tokens
* @param from Address to transfer from
* @param to Address to transfer to
* @param amount Amount to transfer
**/
function _transfer(
address from,
address to,
uint256 amount
) internal override {
uint256 balanceOfFrom = balanceOf(from);
// Sender
_updateCurrentUnclaimedRewards(from, balanceOfFrom, true);
// Recipient
if (from != to) {
uint256 balanceOfTo = balanceOf(to);
_updateCurrentUnclaimedRewards(to, balanceOfTo, true);
uint256 previousSenderCooldown = stakersCooldowns[from];
stakersCooldowns[to] = getNextCooldownTimestamp(
previousSenderCooldown,
amount,
to,
balanceOfTo
);
// if cooldown was set and whole balance of sender was transferred - clear cooldown
if (balanceOfFrom == amount && previousSenderCooldown != 0) {
stakersCooldowns[from] = 0;
}
}
super._transfer(from, to, amount);
}
/**
* @dev Updates the user state related with his accrued rewards
* @param user Address of the user
* @param userBalance The current balance of the user
* @param updateStorage Boolean flag used to update or not the stakerRewardsToClaim of the user
* @return The unclaimed rewards that were added to the total accrued
**/
function _updateCurrentUnclaimedRewards(
address user,
uint256 userBalance,
bool updateStorage
) internal returns (uint256) {
uint256 accruedRewards =
_updateUserAssetInternal(user, address(this), userBalance, totalSupply());
uint256 unclaimedRewards = stakerRewardsToClaim[user].add(accruedRewards);
if (accruedRewards != 0) {
if (updateStorage) {
stakerRewardsToClaim[user] = unclaimedRewards;
}
emit RewardsAccrued(user, accruedRewards);
}
return unclaimedRewards;
}
/**
* @dev Calculates the how is gonna be a new cooldown timestamp depending on the sender/receiver situation
* - If the timestamp of the sender is "better" or the timestamp of the recipient is 0, we take the one of the recipient
* - Weighted average of from/to cooldown timestamps if:
* # The sender doesn't have the cooldown activated (timestamp 0).
* # The sender timestamp is expired
* # The sender has a "worse" timestamp
* - If the receiver's cooldown timestamp expired (too old), the next is 0
* @param fromCooldownTimestamp Cooldown timestamp of the sender
* @param amountToReceive Amount
* @param toAddress Address of the recipient
* @param toBalance Current balance of the receiver
* @return The new cooldown timestamp
**/
function getNextCooldownTimestamp(
uint256 fromCooldownTimestamp,
uint256 amountToReceive,
address toAddress,
uint256 toBalance
) public view returns (uint256) {
uint256 toCooldownTimestamp = stakersCooldowns[toAddress];
if (toCooldownTimestamp == 0) {
return 0;
}
uint256 minimalValidCooldownTimestamp =
block.timestamp.sub(COOLDOWN_SECONDS).sub(UNSTAKE_WINDOW);
if (minimalValidCooldownTimestamp > toCooldownTimestamp) {
toCooldownTimestamp = 0;
} else {
uint256 fromCooldownTimestamp =
(minimalValidCooldownTimestamp > fromCooldownTimestamp)
? block.timestamp
: fromCooldownTimestamp;
if (fromCooldownTimestamp < toCooldownTimestamp) {
return toCooldownTimestamp;
} else {
toCooldownTimestamp = (
amountToReceive.mul(fromCooldownTimestamp).add(toBalance.mul(toCooldownTimestamp))
)
.div(amountToReceive.add(toBalance));
}
}
return toCooldownTimestamp;
}
/**
* @dev Return the total rewards pending to claim by an staker
* @param staker The staker address
* @return The rewards
*/
function getTotalRewardsBalance(address staker) external view returns (uint256) {
DistributionTypes.UserStakeInput[] memory userStakeInputs =
new DistributionTypes.UserStakeInput[](1);
userStakeInputs[0] = DistributionTypes.UserStakeInput({
underlyingAsset: address(this),
stakedByUser: balanceOf(staker),
totalStaked: totalSupply()
});
return stakerRewardsToClaim[staker].add(_getUnclaimedRewards(staker, userStakeInputs));
}
/**
* @dev returns the revision of the implementation contract
* @return The revision
*/
function getRevision() internal pure override returns (uint256) {
return REVISION;
}
/**
* @dev implements the permit function as for https://github.com/ethereum/EIPs/blob/8a34d644aacf0f9f8f00815307fd7dd5da07655f/EIPS/eip-2612.md
* @param owner the owner of the funds
* @param spender the spender
* @param value the amount
* @param deadline the deadline timestamp, type(uint256).max for no deadline
* @param v signature param
* @param s signature param
* @param r signature param
*/
function permit(
address owner,
address spender,
uint256 value,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) external {
require(owner != address(0), 'INVALID_OWNER');
//solium-disable-next-line
require(block.timestamp <= deadline, 'INVALID_EXPIRATION');
uint256 currentValidNonce = _nonces[owner];
bytes32 digest =
keccak256(
abi.encodePacked(
'\x19\x01',
DOMAIN_SEPARATOR,
keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, currentValidNonce, deadline))
)
);
require(owner == ecrecover(digest, v, r, s), 'INVALID_SIGNATURE');
_nonces[owner] = currentValidNonce.add(1);
_approve(owner, spender, value);
}
/**
* @dev Writes a snapshot before any operation involving transfer of value: _transfer, _mint and _burn
* - On _transfer, it writes snapshots for both "from" and "to"
* - On _mint, only for _to
* - On _burn, only for _from
* @param from the from address
* @param to the to address
* @param amount the amount to transfer
*/
function _beforeTokenTransfer(
address from,
address to,
uint256 amount
) internal override {
address votingFromDelegatee = _votingDelegates[from];
address votingToDelegatee = _votingDelegates[to];
if (votingFromDelegatee == address(0)) {
votingFromDelegatee = from;
}
if (votingToDelegatee == address(0)) {
votingToDelegatee = to;
}
_moveDelegatesByType(
votingFromDelegatee,
votingToDelegatee,
amount,
DelegationType.VOTING_POWER
);
address propPowerFromDelegatee = _propositionPowerDelegates[from];
address propPowerToDelegatee = _propositionPowerDelegates[to];
if (propPowerFromDelegatee == address(0)) {
propPowerFromDelegatee = from;
}
if (propPowerToDelegatee == address(0)) {
propPowerToDelegatee = to;
}
_moveDelegatesByType(
propPowerFromDelegatee,
propPowerToDelegatee,
amount,
DelegationType.PROPOSITION_POWER
);
// caching the aave governance address to avoid multiple state loads
ITransferHook aaveGovernance = _aaveGovernance;
if (aaveGovernance != ITransferHook(0)) {
aaveGovernance.onTransfer(from, to, amount);
}
}
function _getDelegationDataByType(DelegationType delegationType)
internal
view
override
returns (
mapping(address => mapping(uint256 => Snapshot)) storage, //snapshots
mapping(address => uint256) storage, //snapshots count
mapping(address => address) storage //delegatees list
)
{
if (delegationType == DelegationType.VOTING_POWER) {
return (_votingSnapshots, _votingSnapshotsCounts, _votingDelegates);
} else {
return (
_propositionPowerSnapshots,
_propositionPowerSnapshotsCounts,
_propositionPowerDelegates
);
}
}
/**
* @dev Delegates power from signatory to `delegatee`
* @param delegatee The address to delegate votes to
* @param delegationType the type of delegation (VOTING_POWER, PROPOSITION_POWER)
* @param nonce The contract state required to match the signature
* @param expiry The time at which to expire the signature
* @param v The recovery byte of the signature
* @param r Half of the ECDSA signature pair
* @param s Half of the ECDSA signature pair
*/
function delegateByTypeBySig(
address delegatee,
DelegationType delegationType,
uint256 nonce,
uint256 expiry,
uint8 v,
bytes32 r,
bytes32 s
) public {
bytes32 structHash =
keccak256(
abi.encode(DELEGATE_BY_TYPE_TYPEHASH, delegatee, uint256(delegationType), nonce, expiry)
);
bytes32 digest = keccak256(abi.encodePacked('\x19\x01', DOMAIN_SEPARATOR, structHash));
address signatory = ecrecover(digest, v, r, s);
require(signatory != address(0), 'INVALID_SIGNATURE');
require(nonce == _nonces[signatory]++, 'INVALID_NONCE');
require(block.timestamp <= expiry, 'INVALID_EXPIRATION');
_delegateByType(signatory, delegatee, delegationType);
}
/**
* @dev Delegates power from signatory to `delegatee`
* @param delegatee The address to delegate votes to
* @param nonce The contract state required to match the signature
* @param expiry The time at which to expire the signature
* @param v The recovery byte of the signature
* @param r Half of the ECDSA signature pair
* @param s Half of the ECDSA signature pair
*/
function delegateBySig(
address delegatee,
uint256 nonce,
uint256 expiry,
uint8 v,
bytes32 r,
bytes32 s
) public {
bytes32 structHash = keccak256(abi.encode(DELEGATE_TYPEHASH, delegatee, nonce, expiry));
bytes32 digest = keccak256(abi.encodePacked('\x19\x01', DOMAIN_SEPARATOR, structHash));
address signatory = ecrecover(digest, v, r, s);
require(signatory != address(0), 'INVALID_SIGNATURE');
require(nonce == _nonces[signatory]++, 'INVALID_NONCE');
require(block.timestamp <= expiry, 'INVALID_EXPIRATION');
_delegateByType(signatory, delegatee, DelegationType.VOTING_POWER);
_delegateByType(signatory, delegatee, DelegationType.PROPOSITION_POWER);
}
}
// SPDX-License-Identifier: MIT
pragma solidity 0.7.5;
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
* From https://github.com/OpenZeppelin/openzeppelin-contracts
*/
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);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.5;
import "./Context.sol";
import "../interfaces/IERC20.sol";
import "./SafeMath.sol";
import "./Address.sol";
/**
* @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 internal _name;
string internal _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 { }
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.7.5;
interface IStakedAave {
function stake(address to, uint256 amount) external;
function redeem(address to, uint256 amount) external;
function cooldown() external;
function claimRewards(address to, uint256 amount) external;
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.7.5;
interface ITransferHook {
function onTransfer(
address from,
address to,
uint256 amount
) external;
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.7.5;
pragma experimental ABIEncoderV2;
library DistributionTypes {
struct AssetConfigInput {
uint128 emissionPerSecond;
uint256 totalStaked;
address underlyingAsset;
}
struct UserStakeInput {
address underlyingAsset;
uint256 stakedByUser;
uint256 totalStaked;
}
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.7.5;
/**
* @dev From https://github.com/OpenZeppelin/openzeppelin-contracts
* 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) {
// Solidity only automatically asserts when dividing by 0
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;
}
}
// SPDX-License-Identifier: MIT
pragma solidity 0.7.5;
import {IERC20} from '../interfaces/IERC20.sol';
import {SafeMath} from './SafeMath.sol';
import {Address} from './Address.sol';
/**
* @title SafeERC20
* @dev From https://github.com/OpenZeppelin/openzeppelin-contracts
* 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));
}
function safeApprove(
IERC20 token,
address spender,
uint256 value
) internal {
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 callOptionalReturn(IERC20 token, bytes memory data) private {
require(address(token).isContract(), 'SafeERC20: call to non-contract');
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = address(token).call(data);
require(success, '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');
}
}
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.7.5;
/**
* @title VersionedInitializable
*
* @dev Helper contract to support initializer functions. To use it, replace
* the constructor with a function that has the `initializer` modifier.
* WARNING: Unlike constructors, initializer functions must be manually
* invoked. This applies both to deploying an Initializable contract, as well
* as extending an Initializable contract via inheritance.
* WARNING: When used with inheritance, manual care must be taken to not invoke
* a parent initializer twice, or ensure that all initializers are idempotent,
* because this is not dealt with automatically as with constructors.
*
* @author Aave, inspired by the OpenZeppelin Initializable contract
*/
abstract contract VersionedInitializable {
/**
* @dev Indicates that the contract has been initialized.
*/
uint256 internal lastInitializedRevision = 0;
/**
* @dev Modifier to use in the initializer function of a contract.
*/
modifier initializer() {
uint256 revision = getRevision();
require(revision > lastInitializedRevision, 'Contract instance has already been initialized');
lastInitializedRevision = revision;
_;
}
/// @dev returns the revision number of the contract.
/// Needs to be defined in the inherited class as a constant.
function getRevision() internal pure virtual returns (uint256);
// Reserved storage space to allow for layout changes in the future.
uint256[50] private ______gap;
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.7.5;
pragma experimental ABIEncoderV2;
import {SafeMath} from '../lib/SafeMath.sol';
import {DistributionTypes} from '../lib/DistributionTypes.sol';
import {IAaveDistributionManager} from '../interfaces/IAaveDistributionManager.sol';
/**
* @title AaveDistributionManager
* @notice Accounting contract to manage multiple staking distributions
* @author Aave
**/
contract AaveDistributionManager is IAaveDistributionManager {
using SafeMath for uint256;
struct AssetData {
uint128 emissionPerSecond;
uint128 lastUpdateTimestamp;
uint256 index;
mapping(address => uint256) users;
}
uint256 public immutable DISTRIBUTION_END;
address public immutable EMISSION_MANAGER;
uint8 public constant PRECISION = 18;
mapping(address => AssetData) public assets;
event AssetConfigUpdated(address indexed asset, uint256 emission);
event AssetIndexUpdated(address indexed asset, uint256 index);
event UserIndexUpdated(address indexed user, address indexed asset, uint256 index);
constructor(address emissionManager, uint256 distributionDuration) public {
DISTRIBUTION_END = block.timestamp.add(distributionDuration);
EMISSION_MANAGER = emissionManager;
}
/**
* @dev Configures the distribution of rewards for a list of assets
* @param assetsConfigInput The list of configurations to apply
**/
function configureAssets(DistributionTypes.AssetConfigInput[] calldata assetsConfigInput)
external
override
{
require(msg.sender == EMISSION_MANAGER, 'ONLY_EMISSION_MANAGER');
for (uint256 i = 0; i < assetsConfigInput.length; i++) {
AssetData storage assetConfig = assets[assetsConfigInput[i].underlyingAsset];
_updateAssetStateInternal(
assetsConfigInput[i].underlyingAsset,
assetConfig,
assetsConfigInput[i].totalStaked
);
assetConfig.emissionPerSecond = assetsConfigInput[i].emissionPerSecond;
emit AssetConfigUpdated(
assetsConfigInput[i].underlyingAsset,
assetsConfigInput[i].emissionPerSecond
);
}
}
/**
* @dev Updates the state of one distribution, mainly rewards index and timestamp
* @param underlyingAsset The address used as key in the distribution, for example sAAVE or the aTokens addresses on Aave
* @param assetConfig Storage pointer to the distribution's config
* @param totalStaked Current total of staked assets for this distribution
* @return The new distribution index
**/
function _updateAssetStateInternal(
address underlyingAsset,
AssetData storage assetConfig,
uint256 totalStaked
) internal returns (uint256) {
uint256 oldIndex = assetConfig.index;
uint128 lastUpdateTimestamp = assetConfig.lastUpdateTimestamp;
if (block.timestamp == lastUpdateTimestamp) {
return oldIndex;
}
uint256 newIndex =
_getAssetIndex(oldIndex, assetConfig.emissionPerSecond, lastUpdateTimestamp, totalStaked);
if (newIndex != oldIndex) {
assetConfig.index = newIndex;
emit AssetIndexUpdated(underlyingAsset, newIndex);
}
assetConfig.lastUpdateTimestamp = uint128(block.timestamp);
return newIndex;
}
/**
* @dev Updates the state of an user in a distribution
* @param user The user's address
* @param asset The address of the reference asset of the distribution
* @param stakedByUser Amount of tokens staked by the user in the distribution at the moment
* @param totalStaked Total tokens staked in the distribution
* @return The accrued rewards for the user until the moment
**/
function _updateUserAssetInternal(
address user,
address asset,
uint256 stakedByUser,
uint256 totalStaked
) internal returns (uint256) {
AssetData storage assetData = assets[asset];
uint256 userIndex = assetData.users[user];
uint256 accruedRewards = 0;
uint256 newIndex = _updateAssetStateInternal(asset, assetData, totalStaked);
if (userIndex != newIndex) {
if (stakedByUser != 0) {
accruedRewards = _getRewards(stakedByUser, newIndex, userIndex);
}
assetData.users[user] = newIndex;
emit UserIndexUpdated(user, asset, newIndex);
}
return accruedRewards;
}
/**
* @dev Used by "frontend" stake contracts to update the data of an user when claiming rewards from there
* @param user The address of the user
* @param stakes List of structs of the user data related with his stake
* @return The accrued rewards for the user until the moment
**/
function _claimRewards(address user, DistributionTypes.UserStakeInput[] memory stakes)
internal
returns (uint256)
{
uint256 accruedRewards = 0;
for (uint256 i = 0; i < stakes.length; i++) {
accruedRewards = accruedRewards.add(
_updateUserAssetInternal(
user,
stakes[i].underlyingAsset,
stakes[i].stakedByUser,
stakes[i].totalStaked
)
);
}
return accruedRewards;
}
/**
* @dev Return the accrued rewards for an user over a list of distribution
* @param user The address of the user
* @param stakes List of structs of the user data related with his stake
* @return The accrued rewards for the user until the moment
**/
function _getUnclaimedRewards(address user, DistributionTypes.UserStakeInput[] memory stakes)
internal
view
returns (uint256)
{
uint256 accruedRewards = 0;
for (uint256 i = 0; i < stakes.length; i++) {
AssetData storage assetConfig = assets[stakes[i].underlyingAsset];
uint256 assetIndex =
_getAssetIndex(
assetConfig.index,
assetConfig.emissionPerSecond,
assetConfig.lastUpdateTimestamp,
stakes[i].totalStaked
);
accruedRewards = accruedRewards.add(
_getRewards(stakes[i].stakedByUser, assetIndex, assetConfig.users[user])
);
}
return accruedRewards;
}
/**
* @dev Internal function for the calculation of user's rewards on a distribution
* @param principalUserBalance Amount staked by the user on a distribution
* @param reserveIndex Current index of the distribution
* @param userIndex Index stored for the user, representation his staking moment
* @return The rewards
**/
function _getRewards(
uint256 principalUserBalance,
uint256 reserveIndex,
uint256 userIndex
) internal pure returns (uint256) {
return principalUserBalance.mul(reserveIndex.sub(userIndex)).div(10**uint256(PRECISION));
}
/**
* @dev Calculates the next value of an specific distribution index, with validations
* @param currentIndex Current index of the distribution
* @param emissionPerSecond Representing the total rewards distributed per second per asset unit, on the distribution
* @param lastUpdateTimestamp Last moment this distribution was updated
* @param totalBalance of tokens considered for the distribution
* @return The new index.
**/
function _getAssetIndex(
uint256 currentIndex,
uint256 emissionPerSecond,
uint128 lastUpdateTimestamp,
uint256 totalBalance
) internal view returns (uint256) {
if (
emissionPerSecond == 0 ||
totalBalance == 0 ||
lastUpdateTimestamp == block.timestamp ||
lastUpdateTimestamp >= DISTRIBUTION_END
) {
return currentIndex;
}
uint256 currentTimestamp =
block.timestamp > DISTRIBUTION_END ? DISTRIBUTION_END : block.timestamp;
uint256 timeDelta = currentTimestamp.sub(lastUpdateTimestamp);
return
emissionPerSecond.mul(timeDelta).mul(10**uint256(PRECISION)).div(totalBalance).add(
currentIndex
);
}
/**
* @dev Returns the data of an user on a distribution
* @param user Address of the user
* @param asset The address of the reference asset of the distribution
* @return The new index
**/
function getUserAssetData(address user, address asset) public view returns (uint256) {
return assets[asset].users[user];
}
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.7.5;
import {ERC20} from '../lib/ERC20.sol';
import {ITransferHook} from '../interfaces/ITransferHook.sol';
import {SafeMath} from '../lib/SafeMath.sol';
import {
GovernancePowerDelegationERC20
} from '@aave/aave-token/contracts/token/base/GovernancePowerDelegationERC20.sol';
/**
* @title ERC20WithSnapshot
* @notice ERC20 including snapshots of balances on transfer-related actions
* @author Aave
**/
abstract contract GovernancePowerWithSnapshot is GovernancePowerDelegationERC20 {
using SafeMath for uint256;
/**
* @dev The following storage layout points to the prior StakedToken.sol implementation:
* _snapshots => _votingSnapshots
* _snapshotsCounts => _votingSnapshotsCounts
* _aaveGovernance => _aaveGovernance
*/
mapping(address => mapping(uint256 => Snapshot)) public _votingSnapshots;
mapping(address => uint256) public _votingSnapshotsCounts;
/// @dev reference to the Aave governance contract to call (if initialized) on _beforeTokenTransfer
/// !!! IMPORTANT The Aave governance is considered a trustable contract, being its responsibility
/// to control all potential reentrancies by calling back the this contract
ITransferHook public _aaveGovernance;
function _setAaveGovernance(ITransferHook aaveGovernance) internal virtual {
_aaveGovernance = aaveGovernance;
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.5;
/*
* @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;
}
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.7.5;
/**
* @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);
}
pragma solidity ^0.7.5;
/**
* @dev Wrappers over Solidity's arithmetic operations with added overflow
* checks.
*
* Arithmetic operations in Solidity wrap on overflow. This can easily result
* in bugs, because programmers usually assume that an overflow raises an
* error, which is the standard behavior in high level programming languages.
* `SafeMath` restores this intuition by reverting the transaction when an
* operation overflows.
*
* Using this library instead of the unchecked operations eliminates an entire
* class of bugs, so it's recommended to use it always.
*/
library SafeMath {
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
* - Addition cannot overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
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) {
// Solidity only automatically asserts when dividing by 0
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;
}
}
pragma solidity ^0.7.5;
/**
* @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");
}
}
// SPDX-License-Identifier: MIT
pragma solidity 0.7.5;
/**
* @dev Collection of functions related to the address type
* From https://github.com/OpenZeppelin/openzeppelin-contracts
*/
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');
}
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.7.5;
pragma experimental ABIEncoderV2;
import {DistributionTypes} from '../lib/DistributionTypes.sol';
interface IAaveDistributionManager {
function configureAssets(DistributionTypes.AssetConfigInput[] calldata assetsConfigInput)
external;
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.7.5;
import {Context} from './Context.sol';
import {IERC20} from '../interfaces/IERC20.sol';
import {IERC20Detailed} from '../interfaces/IERC20Detailed.sol';
import {SafeMath} from './SafeMath.sol';
/**
* @title ERC20
* @notice Basic ERC20 implementation
* @author Aave
**/
contract ERC20 is Context, IERC20, IERC20Detailed {
using SafeMath for uint256;
mapping(address => uint256) private _balances;
mapping(address => mapping(address => uint256)) private _allowances;
uint256 private _totalSupply;
string private _name;
string private _symbol;
uint8 private _decimals;
constructor(
string memory name,
string memory symbol,
uint8 decimals
) public {
_name = name;
_symbol = symbol;
_decimals = decimals;
}
/**
* @return the name of the token
**/
function name() public view override returns (string memory) {
return _name;
}
/**
* @return the symbol of the token
**/
function symbol() public view override returns (string memory) {
return _symbol;
}
/**
* @return the decimals of the token
**/
function decimals() public view override returns (uint8) {
return _decimals;
}
/**
* @return the total supply of the token
**/
function totalSupply() public view override returns (uint256) {
return _totalSupply;
}
/**
* @return the balance of the token
**/
function balanceOf(address account) public view override returns (uint256) {
return _balances[account];
}
/**
* @dev executes a transfer of tokens from msg.sender to recipient
* @param recipient the recipient of the tokens
* @param amount the amount of tokens being transferred
* @return true if the transfer succeeds, false otherwise
**/
function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
_transfer(_msgSender(), recipient, amount);
return true;
}
/**
* @dev returns the allowance of spender on the tokens owned by owner
* @param owner the owner of the tokens
* @param spender the user allowed to spend the owner's tokens
* @return the amount of owner's tokens spender is allowed to spend
**/
function allowance(address owner, address spender)
public
view
virtual
override
returns (uint256)
{
return _allowances[owner][spender];
}
/**
* @dev allows spender to spend the tokens owned by msg.sender
* @param spender the user allowed to spend msg.sender tokens
* @return true
**/
function approve(address spender, uint256 amount) public virtual override returns (bool) {
_approve(_msgSender(), spender, amount);
return true;
}
/**
* @dev executes a transfer of token from sender to recipient, if msg.sender is allowed to do so
* @param sender the owner of the tokens
* @param recipient the recipient of the tokens
* @param amount the amount of tokens being transferred
* @return true if the transfer succeeds, false otherwise
**/
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 increases the allowance of spender to spend msg.sender tokens
* @param spender the user allowed to spend on behalf of msg.sender
* @param addedValue the amount being added to the allowance
* @return true
**/
function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
return true;
}
/**
* @dev decreases the allowance of spender to spend msg.sender tokens
* @param spender the user allowed to spend on behalf of msg.sender
* @param subtractedValue the amount being subtracted to the allowance
* @return true
**/
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;
}
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);
}
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);
}
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);
}
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);
}
function _setName(string memory newName) internal {
_name = newName;
}
function _setSymbol(string memory newSymbol) internal {
_symbol = newSymbol;
}
function _setDecimals(uint8 newDecimals) internal {
_decimals = newDecimals;
}
function _beforeTokenTransfer(
address from,
address to,
uint256 amount
) internal virtual {}
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.7.5;
import {SafeMath} from '../../open-zeppelin/SafeMath.sol';
import {ERC20} from '../../open-zeppelin/ERC20.sol';
import {
IGovernancePowerDelegationToken
} from '../../interfaces/IGovernancePowerDelegationToken.sol';
/**
* @notice implementation of the AAVE token contract
* @author Aave
*/
abstract contract GovernancePowerDelegationERC20 is ERC20, IGovernancePowerDelegationToken {
using SafeMath for uint256;
/// @notice The EIP-712 typehash for the delegation struct used by the contract
bytes32 public constant DELEGATE_BY_TYPE_TYPEHASH = keccak256(
'DelegateByType(address delegatee,uint256 type,uint256 nonce,uint256 expiry)'
);
bytes32 public constant DELEGATE_TYPEHASH = keccak256(
'Delegate(address delegatee,uint256 nonce,uint256 expiry)'
);
/// @dev snapshot of a value on a specific block, used for votes
struct Snapshot {
uint128 blockNumber;
uint128 value;
}
/**
* @dev delegates one specific power to a delegatee
* @param delegatee the user which delegated power has changed
* @param delegationType the type of delegation (VOTING_POWER, PROPOSITION_POWER)
**/
function delegateByType(address delegatee, DelegationType delegationType) external override {
_delegateByType(msg.sender, delegatee, delegationType);
}
/**
* @dev delegates all the powers to a specific user
* @param delegatee the user to which the power will be delegated
**/
function delegate(address delegatee) external override {
_delegateByType(msg.sender, delegatee, DelegationType.VOTING_POWER);
_delegateByType(msg.sender, delegatee, DelegationType.PROPOSITION_POWER);
}
/**
* @dev returns the delegatee of an user
* @param delegator the address of the delegator
**/
function getDelegateeByType(address delegator, DelegationType delegationType)
external
override
view
returns (address)
{
(, , mapping(address => address) storage delegates) = _getDelegationDataByType(delegationType);
return _getDelegatee(delegator, delegates);
}
/**
* @dev returns the current delegated power of a user. The current power is the
* power delegated at the time of the last snapshot
* @param user the user
**/
function getPowerCurrent(address user, DelegationType delegationType)
external
override
view
returns (uint256)
{
(
mapping(address => mapping(uint256 => Snapshot)) storage snapshots,
mapping(address => uint256) storage snapshotsCounts,
) = _getDelegationDataByType(delegationType);
return _searchByBlockNumber(snapshots, snapshotsCounts, user, block.number);
}
/**
* @dev returns the delegated power of a user at a certain block
* @param user the user
**/
function getPowerAtBlock(
address user,
uint256 blockNumber,
DelegationType delegationType
) external override view returns (uint256) {
(
mapping(address => mapping(uint256 => Snapshot)) storage snapshots,
mapping(address => uint256) storage snapshotsCounts,
) = _getDelegationDataByType(delegationType);
return _searchByBlockNumber(snapshots, snapshotsCounts, user, blockNumber);
}
/**
* @dev returns the total supply at a certain block number
* used by the voting strategy contracts to calculate the total votes needed for threshold/quorum
* In this initial implementation with no AAVE minting, simply returns the current supply
* A snapshots mapping will need to be added in case a mint function is added to the AAVE token in the future
**/
function totalSupplyAt(uint256 blockNumber) external override view returns (uint256) {
return super.totalSupply();
}
/**
* @dev delegates the specific power to a delegatee
* @param delegatee the user which delegated power has changed
* @param delegationType the type of delegation (VOTING_POWER, PROPOSITION_POWER)
**/
function _delegateByType(
address delegator,
address delegatee,
DelegationType delegationType
) internal {
require(delegatee != address(0), 'INVALID_DELEGATEE');
(, , mapping(address => address) storage delegates) = _getDelegationDataByType(delegationType);
uint256 delegatorBalance = balanceOf(delegator);
address previousDelegatee = _getDelegatee(delegator, delegates);
delegates[delegator] = delegatee;
_moveDelegatesByType(previousDelegatee, delegatee, delegatorBalance, delegationType);
emit DelegateChanged(delegator, delegatee, delegationType);
}
/**
* @dev moves delegated power from one user to another
* @param from the user from which delegated power is moved
* @param to the user that will receive the delegated power
* @param amount the amount of delegated power to be moved
* @param delegationType the type of delegation (VOTING_POWER, PROPOSITION_POWER)
**/
function _moveDelegatesByType(
address from,
address to,
uint256 amount,
DelegationType delegationType
) internal {
if (from == to) {
return;
}
(
mapping(address => mapping(uint256 => Snapshot)) storage snapshots,
mapping(address => uint256) storage snapshotsCounts,
) = _getDelegationDataByType(delegationType);
if (from != address(0)) {
uint256 previous = 0;
uint256 fromSnapshotsCount = snapshotsCounts[from];
if (fromSnapshotsCount != 0) {
previous = snapshots[from][fromSnapshotsCount - 1].value;
} else {
previous = balanceOf(from);
}
_writeSnapshot(
snapshots,
snapshotsCounts,
from,
uint128(previous),
uint128(previous.sub(amount))
);
emit DelegatedPowerChanged(from, previous.sub(amount), delegationType);
}
if (to != address(0)) {
uint256 previous = 0;
uint256 toSnapshotsCount = snapshotsCounts[to];
if (toSnapshotsCount != 0) {
previous = snapshots[to][toSnapshotsCount - 1].value;
} else {
previous = balanceOf(to);
}
_writeSnapshot(
snapshots,
snapshotsCounts,
to,
uint128(previous),
uint128(previous.add(amount))
);
emit DelegatedPowerChanged(to, previous.add(amount), delegationType);
}
}
/**
* @dev searches a snapshot by block number. Uses binary search.
* @param snapshots the snapshots mapping
* @param snapshotsCounts the number of snapshots
* @param user the user for which the snapshot is being searched
* @param blockNumber the block number being searched
**/
function _searchByBlockNumber(
mapping(address => mapping(uint256 => Snapshot)) storage snapshots,
mapping(address => uint256) storage snapshotsCounts,
address user,
uint256 blockNumber
) internal view returns (uint256) {
require(blockNumber <= block.number, 'INVALID_BLOCK_NUMBER');
uint256 snapshotsCount = snapshotsCounts[user];
if (snapshotsCount == 0) {
return balanceOf(user);
}
// First check most recent balance
if (snapshots[user][snapshotsCount - 1].blockNumber <= blockNumber) {
return snapshots[user][snapshotsCount - 1].value;
}
// Next check implicit zero balance
if (snapshots[user][0].blockNumber > blockNumber) {
return 0;
}
uint256 lower = 0;
uint256 upper = snapshotsCount - 1;
while (upper > lower) {
uint256 center = upper - (upper - lower) / 2; // ceil, avoiding overflow
Snapshot memory snapshot = snapshots[user][center];
if (snapshot.blockNumber == blockNumber) {
return snapshot.value;
} else if (snapshot.blockNumber < blockNumber) {
lower = center;
} else {
upper = center - 1;
}
}
return snapshots[user][lower].value;
}
/**
* @dev returns the delegation data (snapshot, snapshotsCount, list of delegates) by delegation type
* NOTE: Ideal implementation would have mapped this in a struct by delegation type. Unfortunately,
* the AAVE token and StakeToken already include a mapping for the snapshots, so we require contracts
* who inherit from this to provide access to the delegation data by overriding this method.
* @param delegationType the type of delegation
**/
function _getDelegationDataByType(DelegationType delegationType)
internal
virtual
view
returns (
mapping(address => mapping(uint256 => Snapshot)) storage, //snapshots
mapping(address => uint256) storage, //snapshots count
mapping(address => address) storage //delegatees list
);
/**
* @dev Writes a snapshot for an owner of tokens
* @param owner The owner of the tokens
* @param oldValue The value before the operation that is gonna be executed after the snapshot
* @param newValue The value after the operation
*/
function _writeSnapshot(
mapping(address => mapping(uint256 => Snapshot)) storage snapshots,
mapping(address => uint256) storage snapshotsCounts,
address owner,
uint128 oldValue,
uint128 newValue
) internal {
uint128 currentBlock = uint128(block.number);
uint256 ownerSnapshotsCount = snapshotsCounts[owner];
mapping(uint256 => Snapshot) storage snapshotsOwner = snapshots[owner];
// Doing multiple operations in the same block
if (
ownerSnapshotsCount != 0 &&
snapshotsOwner[ownerSnapshotsCount - 1].blockNumber == currentBlock
) {
snapshotsOwner[ownerSnapshotsCount - 1].value = newValue;
} else {
snapshotsOwner[ownerSnapshotsCount] = Snapshot(currentBlock, newValue);
snapshotsCounts[owner] = ownerSnapshotsCount + 1;
}
}
/**
* @dev returns the user delegatee. If a user never performed any delegation,
* his delegated address will be 0x0. In that case we simply return the user itself
* @param delegator the address of the user for which return the delegatee
* @param delegates the array of delegates for a particular type of delegation
**/
function _getDelegatee(address delegator, mapping(address => address) storage delegates)
internal
view
returns (address)
{
address previousDelegatee = delegates[delegator];
if (previousDelegatee == address(0)) {
return delegator;
}
return previousDelegatee;
}
}
// SPDX-License-Identifier: MIT
pragma solidity 0.7.5;
/**
* @dev From https://github.com/OpenZeppelin/openzeppelin-contracts
* 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;
}
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.7.5;
import {IERC20} from './IERC20.sol';
/**
* @dev Interface for ERC20 including metadata
**/
interface IERC20Detailed is IERC20 {
function name() external view returns (string memory);
function symbol() external view returns (string memory);
function decimals() external view returns (uint8);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.7.5;
interface IGovernancePowerDelegationToken {
enum DelegationType {VOTING_POWER, PROPOSITION_POWER}
/**
* @dev emitted when a user delegates to another
* @param delegator the delegator
* @param delegatee the delegatee
* @param delegationType the type of delegation (VOTING_POWER, PROPOSITION_POWER)
**/
event DelegateChanged(
address indexed delegator,
address indexed delegatee,
DelegationType delegationType
);
/**
* @dev emitted when an action changes the delegated power of a user
* @param user the user which delegated power has changed
* @param amount the amount of delegated power for the user
* @param delegationType the type of delegation (VOTING_POWER, PROPOSITION_POWER)
**/
event DelegatedPowerChanged(address indexed user, uint256 amount, DelegationType delegationType);
/**
* @dev delegates the specific power to a delegatee
* @param delegatee the user which delegated power has changed
* @param delegationType the type of delegation (VOTING_POWER, PROPOSITION_POWER)
**/
function delegateByType(address delegatee, DelegationType delegationType) external virtual;
/**
* @dev delegates all the powers to a specific user
* @param delegatee the user to which the power will be delegated
**/
function delegate(address delegatee) external virtual;
/**
* @dev returns the delegatee of an user
* @param delegator the address of the delegator
**/
function getDelegateeByType(address delegator, DelegationType delegationType)
external
virtual
view
returns (address);
/**
* @dev returns the current delegated power of a user. The current power is the
* power delegated at the time of the last snapshot
* @param user the user
**/
function getPowerCurrent(address user, DelegationType delegationType)
external
virtual
view
returns (uint256);
/**
* @dev returns the delegated power of a user at a certain block
* @param user the user
**/
function getPowerAtBlock(
address user,
uint256 blockNumber,
DelegationType delegationType
) external virtual view returns (uint256);
/**
* @dev returns the total supply at a certain block number
**/
function totalSupplyAt(uint256 blockNumber) external virtual view returns (uint256);
}