$0.17 | YAM (YAM) Token Tracker | Etherscan
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/** *Submitted for verification at Etherscan.io on 2020-08-11 */ pragma solidity 0.5.17; 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; } } contract YAMTokenStorage { using SafeMath for uint256; /** * @dev Guard variable for re-entrancy checks. Not currently used */ bool internal _notEntered; /** * @notice EIP-20 token name for this token */ string public name; /** * @notice EIP-20 token symbol for this token */ string public symbol; /** * @notice EIP-20 token decimals for this token */ uint8 public decimals; /** * @notice Governor for this contract */ address public gov; /** * @notice Pending governance for this contract */ address public pendingGov; /** * @notice Approved rebaser for this contract */ address public rebaser; /** * @notice Reserve address of YAM protocol */ address public incentivizer; /** * @notice Total supply of YAMs */ uint256 public totalSupply; /** * @notice Internal decimals used to handle scaling factor */ uint256 public constant internalDecimals = 10**24; /** * @notice Used for percentage maths */ uint256 public constant BASE = 10**18; /** * @notice Scaling factor that adjusts everyone's balances */ uint256 public yamsScalingFactor; mapping (address => uint256) internal _yamBalances; mapping (address => mapping (address => uint256)) internal _allowedFragments; uint256 public initSupply; } contract YAMGovernanceStorage { /// @notice A record of each accounts delegate mapping (address => address) internal _delegates; /// @notice A checkpoint for marking number of votes from a given block struct Checkpoint { uint32 fromBlock; uint256 votes; } /// @notice A record of votes checkpoints for each account, by index mapping (address => mapping (uint32 => Checkpoint)) public checkpoints; /// @notice The number of checkpoints for each account mapping (address => uint32) public numCheckpoints; /// @notice The EIP-712 typehash for the contract's domain bytes32 public constant DOMAIN_TYPEHASH = keccak256("EIP712Domain(string name,uint256 chainId,address verifyingContract)"); /// @notice The EIP-712 typehash for the delegation struct used by the contract bytes32 public constant DELEGATION_TYPEHASH = keccak256("Delegation(address delegatee,uint256 nonce,uint256 expiry)"); /// @notice A record of states for signing / validating signatures mapping (address => uint) public nonces; } contract YAMTokenInterface is YAMTokenStorage, YAMGovernanceStorage { /// @notice An event thats emitted when an account changes its delegate event DelegateChanged(address indexed delegator, address indexed fromDelegate, address indexed toDelegate); /// @notice An event thats emitted when a delegate account's vote balance changes event DelegateVotesChanged(address indexed delegate, uint previousBalance, uint newBalance); /** * @notice Event emitted when tokens are rebased */ event Rebase(uint256 epoch, uint256 prevYamsScalingFactor, uint256 newYamsScalingFactor); /*** Gov Events ***/ /** * @notice Event emitted when pendingGov is changed */ event NewPendingGov(address oldPendingGov, address newPendingGov); /** * @notice Event emitted when gov is changed */ event NewGov(address oldGov, address newGov); /** * @notice Sets the rebaser contract */ event NewRebaser(address oldRebaser, address newRebaser); /** * @notice Sets the incentivizer contract */ event NewIncentivizer(address oldIncentivizer, address newIncentivizer); /* - ERC20 Events - */ /** * @notice EIP20 Transfer event */ event Transfer(address indexed from, address indexed to, uint amount); /** * @notice EIP20 Approval event */ event Approval(address indexed owner, address indexed spender, uint amount); /* - Extra Events - */ /** * @notice Tokens minted event */ event Mint(address to, uint256 amount); // Public functions function transfer(address to, uint256 value) external returns(bool); function transferFrom(address from, address to, uint256 value) external returns(bool); function balanceOf(address who) external view returns(uint256); function balanceOfUnderlying(address who) external view returns(uint256); function allowance(address owner_, address spender) external view returns(uint256); function approve(address spender, uint256 value) external returns (bool); function increaseAllowance(address spender, uint256 addedValue) external returns (bool); function decreaseAllowance(address spender, uint256 subtractedValue) external returns (bool); function maxScalingFactor() external view returns (uint256); /* - Governance Functions - */ function getPriorVotes(address account, uint blockNumber) external view returns (uint256); function delegateBySig(address delegatee, uint nonce, uint expiry, uint8 v, bytes32 r, bytes32 s) external; function delegate(address delegatee) external; function delegates(address delegator) external view returns (address); function getCurrentVotes(address account) external view returns (uint256); /* - Permissioned/Governance functions - */ function mint(address to, uint256 amount) external returns (bool); function rebase(uint256 epoch, uint256 indexDelta, bool positive) external returns (uint256); function _setRebaser(address rebaser_) external; function _setIncentivizer(address incentivizer_) external; function _setPendingGov(address pendingGov_) external; function _acceptGov() external; } contract YAMDelegationStorage { /** * @notice Implementation address for this contract */ address public implementation; } contract YAMDelegatorInterface is YAMDelegationStorage { /** * @notice Emitted when implementation is changed */ event NewImplementation(address oldImplementation, address newImplementation); /** * @notice Called by the gov to update the implementation of the delegator * @param implementation_ The address of the new implementation for delegation * @param allowResign Flag to indicate whether to call _resignImplementation on the old implementation * @param becomeImplementationData The encoded bytes data to be passed to _becomeImplementation */ function _setImplementation(address implementation_, bool allowResign, bytes memory becomeImplementationData) public; } contract YAMDelegator is YAMTokenInterface, YAMDelegatorInterface { /** * @notice Construct a new YAM * @param name_ ERC-20 name of this token * @param symbol_ ERC-20 symbol of this token * @param decimals_ ERC-20 decimal precision of this token * @param initSupply_ Initial token amount * @param implementation_ The address of the implementation the contract delegates to * @param becomeImplementationData The encoded args for becomeImplementation */ constructor( string memory name_, string memory symbol_, uint8 decimals_, uint256 initSupply_, address implementation_, bytes memory becomeImplementationData ) public { // Creator of the contract is gov during initialization gov = msg.sender; // First delegate gets to initialize the delegator (i.e. storage contract) delegateTo( implementation_, abi.encodeWithSignature( "initialize(string,string,uint8,address,uint256)", name_, symbol_, decimals_, msg.sender, initSupply_ ) ); // New implementations always get set via the settor (post-initialize) _setImplementation(implementation_, false, becomeImplementationData); } /** * @notice Called by the gov to update the implementation of the delegator * @param implementation_ The address of the new implementation for delegation * @param allowResign Flag to indicate whether to call _resignImplementation on the old implementation * @param becomeImplementationData The encoded bytes data to be passed to _becomeImplementation */ function _setImplementation(address implementation_, bool allowResign, bytes memory becomeImplementationData) public { require(msg.sender == gov, "YAMDelegator::_setImplementation: Caller must be gov"); if (allowResign) { delegateToImplementation(abi.encodeWithSignature("_resignImplementation()")); } address oldImplementation = implementation; implementation = implementation_; delegateToImplementation(abi.encodeWithSignature("_becomeImplementation(bytes)", becomeImplementationData)); emit NewImplementation(oldImplementation, implementation); } /** * @notice Sender supplies assets into the market and receives cTokens in exchange * @dev Accrues interest whether or not the operation succeeds, unless reverted * @param mintAmount The amount of the underlying asset to supply * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function mint(address to, uint256 mintAmount) external returns (bool) { to; mintAmount; // Shh delegateAndReturn(); } /** * @notice Transfer `amount` tokens from `msg.sender` to `dst` * @param dst The address of the destination account * @param amount The number of tokens to transfer * @return Whether or not the transfer succeeded */ function transfer(address dst, uint256 amount) external returns (bool) { dst; amount; // Shh delegateAndReturn(); } /** * @notice Transfer `amount` tokens from `src` to `dst` * @param src The address of the source account * @param dst The address of the destination account * @param amount The number of tokens to transfer * @return Whether or not the transfer succeeded */ function transferFrom( address src, address dst, uint256 amount ) external returns (bool) { src; dst; amount; // Shh delegateAndReturn(); } /** * @notice Approve `spender` to transfer up to `amount` from `src` * @dev This will overwrite the approval amount for `spender` * and is subject to issues noted [here](https://eips.ethereum.org/EIPS/eip-20#approve) * @param spender The address of the account which may transfer tokens * @param amount The number of tokens that are approved (-1 means infinite) * @return Whether or not the approval succeeded */ function approve( address spender, uint256 amount ) external returns (bool) { spender; amount; // Shh delegateAndReturn(); } /** * @dev Increase the amount of tokens that an owner has allowed to a spender. * This method should be used instead of approve() to avoid the double approval vulnerability * described above. * @param spender The address which will spend the funds. * @param addedValue The amount of tokens to increase the allowance by. */ function increaseAllowance( address spender, uint256 addedValue ) external returns (bool) { spender; addedValue; // Shh delegateAndReturn(); } function maxScalingFactor() external view returns (uint256) { delegateToViewAndReturn(); } function rebase( uint256 epoch, uint256 indexDelta, bool positive ) external returns (uint256) { epoch; indexDelta; positive; delegateAndReturn(); } /** * @dev Decrease the amount of tokens that an owner has allowed to a spender. * * @param spender The address which will spend the funds. * @param subtractedValue The amount of tokens to decrease the allowance by. */ function decreaseAllowance( address spender, uint256 subtractedValue ) external returns (bool) { spender; subtractedValue; // Shh delegateAndReturn(); } /** * @notice Get the current allowance from `owner` for `spender` * @param owner The address of the account which owns the tokens to be spent * @param spender The address of the account which may transfer tokens * @return The number of tokens allowed to be spent (-1 means infinite) */ function allowance( address owner, address spender ) external view returns (uint256) { owner; spender; // Shh delegateToViewAndReturn(); } /** * @notice Get the current allowance from `owner` for `spender` * @param delegator The address of the account which has designated a delegate * @return Address of delegatee */ function delegates( address delegator ) external view returns (address) { delegator; // Shh delegateToViewAndReturn(); } /** * @notice Get the token balance of the `owner` * @param owner The address of the account to query * @return The number of tokens owned by `owner` */ function balanceOf(address owner) external view returns (uint256) { owner; // Shh delegateToViewAndReturn(); } /** * @notice Currently unused. For future compatability * @param owner The address of the account to query * @return The number of underlying tokens owned by `owner` */ function balanceOfUnderlying(address owner) external view returns (uint256) { owner; // Shh delegateToViewAndReturn(); } /*** Gov Functions ***/ /** * @notice Begins transfer of gov rights. The newPendingGov must call `_acceptGov` to finalize the transfer. * @dev Gov function to begin change of gov. The newPendingGov must call `_acceptGov` to finalize the transfer. * @param newPendingGov New pending gov. */ function _setPendingGov(address newPendingGov) external { newPendingGov; // Shh delegateAndReturn(); } function _setRebaser(address rebaser_) external { rebaser_; // Shh delegateAndReturn(); } function _setIncentivizer(address incentivizer_) external { incentivizer_; // Shh delegateAndReturn(); } /** * @notice Accepts transfer of gov rights. msg.sender must be pendingGov * @dev Gov function for pending gov to accept role and update gov * @return uint 0=success, otherwise a failure (see ErrorReporter.sol for details) */ function _acceptGov() external { delegateAndReturn(); } function getPriorVotes(address account, uint blockNumber) external view returns (uint256) { account; blockNumber; delegateToViewAndReturn(); } function delegateBySig( address delegatee, uint nonce, uint expiry, uint8 v, bytes32 r, bytes32 s ) external { delegatee; nonce; expiry; v; r; s; delegateAndReturn(); } function delegate(address delegatee) external { delegatee; delegateAndReturn(); } function getCurrentVotes(address account) external view returns (uint256) { account; delegateToViewAndReturn(); } /** * @notice Internal method to delegate execution to another contract * @dev It returns to the external caller whatever the implementation returns or forwards reverts * @param callee The contract to delegatecall * @param data The raw data to delegatecall * @return The returned bytes from the delegatecall */ function delegateTo(address callee, bytes memory data) internal returns (bytes memory) { (bool success, bytes memory returnData) = callee.delegatecall(data); assembly { if eq(success, 0) { revert(add(returnData, 0x20), returndatasize) } } return returnData; } /** * @notice Delegates execution to the implementation contract * @dev It returns to the external caller whatever the implementation returns or forwards reverts * @param data The raw data to delegatecall * @return The returned bytes from the delegatecall */ function delegateToImplementation(bytes memory data) public returns (bytes memory) { return delegateTo(implementation, data); } /** * @notice Delegates execution to an implementation contract * @dev It returns to the external caller whatever the implementation returns or forwards reverts * There are an additional 2 prefix uints from the wrapper returndata, which we ignore since we make an extra hop. * @param data The raw data to delegatecall * @return The returned bytes from the delegatecall */ function delegateToViewImplementation(bytes memory data) public view returns (bytes memory) { (bool success, bytes memory returnData) = address(this).staticcall(abi.encodeWithSignature("delegateToImplementation(bytes)", data)); assembly { if eq(success, 0) { revert(add(returnData, 0x20), returndatasize) } } return abi.decode(returnData, (bytes)); } function delegateToViewAndReturn() private view returns (bytes memory) { (bool success, ) = address(this).staticcall(abi.encodeWithSignature("delegateToImplementation(bytes)", msg.data)); assembly { let free_mem_ptr := mload(0x40) returndatacopy(free_mem_ptr, 0, returndatasize) switch success case 0 { revert(free_mem_ptr, returndatasize) } default { return(add(free_mem_ptr, 0x40), returndatasize) } } } function delegateAndReturn() private returns (bytes memory) { (bool success, ) = implementation.delegatecall(msg.data); assembly { let free_mem_ptr := mload(0x40) returndatacopy(free_mem_ptr, 0, returndatasize) switch success case 0 { revert(free_mem_ptr, returndatasize) } default { return(free_mem_ptr, returndatasize) } } } /** * @notice Delegates execution to an implementation contract * @dev It returns to the external caller whatever the implementation returns or forwards reverts */ function () external payable { require(msg.value == 0,"YAMDelegator:fallback: cannot send value to fallback"); // delegate all other functions to current implementation delegateAndReturn(); } }
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