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Similar Match Source Code This contract matches the deployed Bytecode of the Source Code for Contract 0x164c6F97...e413aF8A2 The constructor portion of the code might be different and could alter the actual behaviour of the contract
Contract Name:
LoanToken2
Compiler Version
v0.6.10+commit.00c0fcaf
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT pragma solidity 0.6.10; import {IERC20} from "IERC20.sol"; import {SafeMath} from "SafeMath.sol"; import {SafeERC20} from "SafeERC20.sol"; import {ERC20} from "UpgradeableERC20.sol"; import {ILoanToken2, ITrueFiPool2} from "ILoanToken2.sol"; import {LoanToken} from "LoanToken.sol"; /** * @title LoanToken V2 * @dev A token which represents share of a debt obligation * * Each LoanToken has: * - borrower address * - borrow amount * - loan term * - loan APY * * Loan progresses through the following states: * Awaiting: Waiting for funding to meet capital requirements * Funded: Capital requirements met, borrower can withdraw * Withdrawn: Borrower withdraws money, loan waiting to be repaid * Settled: Loan has been paid back in full with interest * Defaulted: Loan has not been paid back in full * Liquidated: Loan has Defaulted and stakers have been Liquidated * * - LoanTokens are non-transferable except for whitelisted addresses * - This version of LoanToken only supports a single funder */ contract LoanToken2 is ILoanToken2, ERC20 { using SafeMath for uint256; using SafeERC20 for ERC20; uint128 public constant LAST_MINUTE_PAYBACK_DURATION = 1 days; uint256 private constant APY_PRECISION = 10000; address public override borrower; address public liquidator; uint256 public override amount; uint256 public override term; // apy precision: 10000 = 100% uint256 public override apy; uint256 public override start; address public override lender; uint256 public override debt; uint256 public redeemed; // whitelist for transfers mapping(address => bool) public canTransfer; Status public override status; ERC20 public override token; ITrueFiPool2 public override pool; /** * @dev Emitted when the loan is funded * @param lender Address which funded the loan */ event Funded(address lender); /** * @dev Emitted when transfer whitelist is updated * @param account Account to whitelist for transfers * @param status New whitelist status */ event TransferAllowanceChanged(address account, bool status); /** * @dev Emitted when borrower withdraws funds * @param beneficiary Account which will receive funds */ event Withdrawn(address beneficiary); /** * @dev Emitted when loan has been fully repaid * @param returnedAmount Amount that was returned */ event Settled(uint256 returnedAmount); /** * @dev Emitted when term is over without full repayment * @param returnedAmount Amount that was returned before expiry */ event Defaulted(uint256 returnedAmount); /** * @dev Emitted when a LoanToken is redeemed for underlying tokens * @param receiver Receiver of tokens * @param burnedAmount Amount of LoanTokens burned * @param redeemedAmount Amount of token received */ event Redeemed(address receiver, uint256 burnedAmount, uint256 redeemedAmount); /** * @dev Emitted when a LoanToken is repaid by the borrower in underlying tokens * @param repayer Sender of tokens * @param repaidAmount Amount of token repaid */ event Repaid(address repayer, uint256 repaidAmount); /** * @dev Emitted when borrower reclaims remaining tokens * @param borrower Receiver of remaining tokens * @param reclaimedAmount Amount of tokens repaid */ event Reclaimed(address borrower, uint256 reclaimedAmount); /** * @dev Emitted when loan gets liquidated * @param status Final loan status */ event Liquidated(Status status); /** * @dev Create a Loan * @param _pool Pool to lend from * @param _borrower Borrower address * @param _lender Lender address * @param _liquidator Liquidator address * @param _amount Borrow amount of loaned tokens * @param _term Loan length * @param _apy Loan APY */ constructor( ITrueFiPool2 _pool, address _borrower, address _lender, address _liquidator, uint256 _amount, uint256 _term, uint256 _apy ) public { require(_lender != address(0), "LoanToken2: Lender is not set"); ERC20.__ERC20_initialize("TrueFi Loan Token", "LOAN"); pool = _pool; token = _pool.token(); borrower = _borrower; liquidator = _liquidator; amount = _amount; term = _term; apy = _apy; lender = _lender; debt = interest(amount); } /** * @dev Only borrower can withdraw & repay loan */ modifier onlyBorrower() { require(msg.sender == borrower, "LoanToken2: Caller is not the borrower"); _; } /** * @dev Only liquidator can liquidate */ modifier onlyLiquidator() { require(msg.sender == liquidator, "LoanToken2: Caller is not the liquidator"); _; } /** * @dev Only after loan has been closed: Settled, Defaulted, or Liquidated */ modifier onlyAfterClose() { require(status >= Status.Settled, "LoanToken2: Only after loan has been closed"); _; } /** * @dev Only when loan is Funded */ modifier onlyOngoing() { require(status == Status.Funded || status == Status.Withdrawn, "LoanToken2: Current status should be Funded or Withdrawn"); _; } /** * @dev Only when loan is Funded */ modifier onlyFunded() { require(status == Status.Funded, "LoanToken2: Current status should be Funded"); _; } /** * @dev Only when loan is Withdrawn */ modifier onlyAfterWithdraw() { require(status >= Status.Withdrawn, "LoanToken2: Only after loan has been withdrawn"); _; } /** * @dev Only when loan is Awaiting */ modifier onlyAwaiting() { require(status == Status.Awaiting, "LoanToken2: Current status should be Awaiting"); _; } /** * @dev Only when loan is Defaulted */ modifier onlyDefaulted() { require(status == Status.Defaulted, "LoanToken2: Current status should be Defaulted"); _; } /** * @dev Only whitelisted accounts or lender */ modifier onlyWhoCanTransfer(address sender) { require( sender == lender || canTransfer[sender], "LoanToken2: This can be performed only by lender or accounts allowed to transfer" ); _; } /** * @dev Only lender can perform certain actions */ modifier onlyLender() { require(msg.sender == lender, "LoanToken2: This can be performed only by lender"); _; } /** * @dev Get loan parameters * @return amount, term, apy */ function getParameters() external override view returns ( uint256, uint256, uint256 ) { return (amount, apy, term); } /** * @dev Get coupon value of this loan token in token * This assumes the loan will be paid back on time, with interest * @param _balance number of LoanTokens to get value for * @return coupon value of _balance LoanTokens in tokens */ function value(uint256 _balance) external override view returns (uint256) { if (_balance == 0) { return 0; } uint256 passed = block.timestamp.sub(start); if (passed > term || status == Status.Settled) { passed = term; } // assume year is 365 days uint256 interest = amount.mul(apy).mul(passed).div(365 days).div(APY_PRECISION); return amount.add(interest).mul(_balance).div(debt); } /** * @dev Fund a loan * Set status, start time, lender */ function fund() external override onlyAwaiting onlyLender { status = Status.Funded; start = block.timestamp; _mint(msg.sender, debt); token.safeTransferFrom(msg.sender, address(this), amount); emit Funded(msg.sender); } /** * @dev Whitelist accounts to transfer * @param account address to allow transfers for * @param _status true allows transfers, false disables transfers */ function allowTransfer(address account, bool _status) external override onlyLender { canTransfer[account] = _status; emit TransferAllowanceChanged(account, _status); } /** * @dev Borrower calls this function to withdraw funds * Sets the status of the loan to Withdrawn * @param _beneficiary address to send funds to */ function withdraw(address _beneficiary) external override onlyBorrower onlyFunded { status = Status.Withdrawn; token.safeTransfer(_beneficiary, amount); emit Withdrawn(_beneficiary); } /** * @dev Settle the loan after checking it has been repaid */ function settle() public override onlyOngoing { require(isRepaid(), "LoanToken2: loan must be repaid to settle"); status = Status.Settled; emit Settled(_balance()); } /** * @dev Default the loan if it has not been repaid by the end of term */ function enterDefault() external override onlyOngoing { require(!isRepaid(), "LoanToken2: cannot default a repaid loan"); require(start.add(term).add(LAST_MINUTE_PAYBACK_DURATION) <= block.timestamp, "LoanToken2: Loan cannot be defaulted yet"); status = Status.Defaulted; emit Defaulted(_balance()); } /** * @dev Liquidate the loan if it has defaulted */ function liquidate() external override onlyDefaulted onlyLiquidator { status = Status.Liquidated; emit Liquidated(status); } /** * @dev Redeem LoanToken balances for underlying token * Can only call this function after the loan is Closed * @param _amount amount to redeem */ function redeem(uint256 _amount) external override onlyAfterClose { uint256 amountToReturn = _amount.mul(_balance()).div(totalSupply()); redeemed = redeemed.add(amountToReturn); _burn(msg.sender, _amount); token.safeTransfer(msg.sender, amountToReturn); emit Redeemed(msg.sender, _amount, amountToReturn); } /** * @dev Function for borrower to repay the loan * Borrower can repay at any time * @param _sender account sending token to repay * @param _amount amount of token to repay */ function repay(address _sender, uint256 _amount) external override { _repay(_sender, _amount); } /** * @dev Function for borrower to repay all of the remaining loan balance * Borrower should use this to ensure full repayment * @param _sender account sending token to repay */ function repayInFull(address _sender) external override { _repay(_sender, debt.sub(_balance())); } /** * @dev Internal function for loan repayment * If _amount is sufficient, then this also settles the loan * @param _sender account sending token to repay * @param _amount amount of token to repay */ function _repay(address _sender, uint256 _amount) internal onlyAfterWithdraw { require(_amount <= debt.sub(_balance()), "LoanToken2: Cannot repay over the debt"); emit Repaid(_sender, _amount); token.safeTransferFrom(_sender, address(this), _amount); if (isRepaid()) { settle(); } } /** * @dev Function for borrower to reclaim stuck token * Can only call this function after the loan is Closed * and all of LoanToken holders have been burnt */ function reclaim() external override onlyAfterClose onlyBorrower { require(totalSupply() == 0, "LoanToken2: Cannot reclaim when LoanTokens are in circulation"); uint256 balanceRemaining = _balance(); require(balanceRemaining > 0, "LoanToken2: Cannot reclaim when balance 0"); token.safeTransfer(borrower, balanceRemaining); emit Reclaimed(borrower, balanceRemaining); } /** * @dev Check how much was already repaid * Funds stored on the contract's address plus funds already redeemed by lenders * @return Uint256 representing what value was already repaid */ function repaid() external override view onlyAfterWithdraw returns (uint256) { return _balance().add(redeemed); } /** * @dev Check whether an ongoing loan has been repaid in full * @return true if and only if this loan has been repaid */ function isRepaid() public override view onlyOngoing returns (bool) { return _balance() >= debt; } /** * @dev Public currency token balance function * @return token balance of this contract */ function balance() external override view returns (uint256) { return _balance(); } /** * @dev Get currency token balance for this contract * @return token balance of this contract */ function _balance() internal view returns (uint256) { return token.balanceOf(address(this)); } /** * @dev Calculate interest that will be paid by this loan for an amount (returned funds included) * amount + ((amount * apy * term) / 365 days / precision) * @param _amount amount * @return uint256 Amount of interest paid for _amount */ function interest(uint256 _amount) internal view returns (uint256) { return _amount.add(_amount.mul(apy).mul(term).div(365 days).div(APY_PRECISION)); } /** * @dev get profit for this loan * @return profit for this loan */ function profit() external override view returns (uint256) { return debt.sub(amount); } /** * @dev Override ERC20 _transfer so only whitelisted addresses can transfer * @param sender sender of the transaction * @param recipient recipient of the transaction * @param _amount amount to send */ function _transfer( address sender, address recipient, uint256 _amount ) internal override onlyWhoCanTransfer(sender) { return super._transfer(sender, recipient, _amount); } function version() external override pure returns (uint8) { return 5; } function decimals() public override view returns (uint8) { return token.decimals(); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; /** * @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); }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; /** * @dev Wrappers over Solidity's arithmetic operations with added overflow * checks. * * Arithmetic operations in Solidity wrap on overflow. This can easily result * in bugs, because programmers usually assume that an overflow raises an * error, which is the standard behavior in high level programming languages. * `SafeMath` restores this intuition by reverting the transaction when an * operation overflows. * * Using this library instead of the unchecked operations eliminates an entire * class of bugs, so it's recommended to use it always. */ library SafeMath { /** * @dev Returns the addition of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `+` operator. * * Requirements: * * - Addition cannot overflow. */ function add(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; require(c >= a, "SafeMath: addition overflow"); return c; } /** * @dev Returns the subtraction of two unsigned integers, reverting on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b) internal pure returns (uint256) { return sub(a, b, "SafeMath: subtraction overflow"); } /** * @dev Returns the subtraction of two unsigned integers, reverting with custom message on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b <= a, errorMessage); uint256 c = a - b; return c; } /** * @dev Returns the multiplication of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `*` operator. * * Requirements: * * - Multiplication cannot overflow. */ function mul(uint256 a, uint256 b) internal pure returns (uint256) { // Gas optimization: this is cheaper than requiring 'a' not being zero, but the // benefit is lost if 'b' is also tested. // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522 if (a == 0) { return 0; } uint256 c = a * b; require(c / a == b, "SafeMath: multiplication overflow"); return c; } /** * @dev Returns the integer division of two unsigned integers. Reverts on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function div(uint256 a, uint256 b) internal pure returns (uint256) { return div(a, b, "SafeMath: division by zero"); } /** * @dev Returns the integer division of two unsigned integers. Reverts with custom message on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b > 0, errorMessage); uint256 c = a / b; // assert(a == b * c + a % b); // There is no case in which this doesn't hold return c; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * Reverts when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b) internal pure returns (uint256) { return mod(a, b, "SafeMath: modulo by zero"); } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * Reverts with custom message when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b != 0, errorMessage); return a % b; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.2; /** * @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) { // This method relies in extcodesize, which returns 0 for contracts in // construction, since the code is only stored at the end of the // constructor execution. uint256 size; // solhint-disable-next-line no-inline-assembly assembly { size := extcodesize(account) } return size > 0; } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); // solhint-disable-next-line avoid-low-level-calls, avoid-call-value (bool success, ) = recipient.call{ value: amount }(""); require(success, "Address: unable to send value, recipient may have reverted"); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain`call` is an unsafe replacement for a function call: use this * function instead. * * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * * Requirements: * * - `target` must be a contract. * - calling `target` with `data` must not revert. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data) internal returns (bytes memory) { return functionCall(target, data, "Address: low-level call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with * `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) { return _functionCallWithValue(target, data, 0, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but also transferring `value` wei to `target`. * * Requirements: * * - the calling contract must have an ETH balance of at least `value`. * - the called Solidity function must be `payable`. * * _Available since v3.1._ */ function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) { return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); } /** * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but * with `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) { require(address(this).balance >= value, "Address: insufficient balance for call"); return _functionCallWithValue(target, data, value, errorMessage); } function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) { require(isContract(target), "Address: call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.call{ value: weiValue }(data); if (success) { return returndata; } else { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly // solhint-disable-next-line no-inline-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; import "IERC20.sol"; import "SafeMath.sol"; import "Address.sol"; /** * @title SafeERC20 * @dev Wrappers around ERC20 operations that throw on failure (when the token * contract returns false). Tokens that return no value (and instead revert or * throw on failure) are also supported, non-reverting calls are assumed to be * successful. * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract, * which allows you to call the safe operations as `token.safeTransfer(...)`, etc. */ library SafeERC20 { using SafeMath for uint256; using Address for address; function safeTransfer(IERC20 token, address to, uint256 value) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value)); } function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value)); } /** * @dev Deprecated. This function has issues similar to the ones found in * {IERC20-approve}, and its usage is discouraged. * * Whenever possible, use {safeIncreaseAllowance} and * {safeDecreaseAllowance} instead. */ function safeApprove(IERC20 token, address spender, uint256 value) internal { // safeApprove should only be called when setting an initial allowance, // or when resetting it to zero. To increase and decrease it, use // 'safeIncreaseAllowance' and 'safeDecreaseAllowance' // solhint-disable-next-line max-line-length require((value == 0) || (token.allowance(address(this), spender) == 0), "SafeERC20: approve from non-zero to non-zero allowance" ); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value)); } function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal { uint256 newAllowance = token.allowance(address(this), spender).add(value); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal { uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero"); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } /** * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement * on the return value: the return value is optional (but if data is returned, it must not be false). * @param token The token targeted by the call. * @param data The call data (encoded using abi.encode or one of its variants). */ function _callOptionalReturn(IERC20 token, bytes memory data) private { // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that // the target address contains contract code and also asserts for success in the low-level call. bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed"); if (returndata.length > 0) { // Return data is optional // solhint-disable-next-line max-line-length require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed"); } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; /* * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with 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; } }
// Copied from https://github.com/OpenZeppelin/openzeppelin-contracts-ethereum-package/blob/v3.0.0/contracts/Initializable.sol // Added public isInitialized() view of private initialized bool. // SPDX-License-Identifier: MIT pragma solidity 0.6.10; /** * @title Initializable * * @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. */ contract Initializable { /** * @dev Indicates that the contract has been initialized. */ bool private initialized; /** * @dev Indicates that the contract is in the process of being initialized. */ bool private initializing; /** * @dev Modifier to use in the initializer function of a contract. */ modifier initializer() { require(initializing || isConstructor() || !initialized, "Contract instance has already been initialized"); bool isTopLevelCall = !initializing; if (isTopLevelCall) { initializing = true; initialized = true; } _; if (isTopLevelCall) { initializing = false; } } /// @dev Returns true if and only if the function is running in the constructor function isConstructor() private view returns (bool) { // extcodesize checks the size of the code stored in an address, and // address returns the current address. Since the code is still not // deployed when running a constructor, any checks on its code size will // yield zero, making it an effective way to detect if a contract is // under construction or not. address self = address(this); uint256 cs; assembly { cs := extcodesize(self) } return cs == 0; } /** * @dev Return true if and only if the contract has been initialized * @return whether the contract has been initialized */ function isInitialized() public view returns (bool) { return initialized; } // Reserved storage space to allow for layout changes in the future. uint256[50] private ______gap; }
// SPDX-License-Identifier: MIT pragma solidity 0.6.10; import {Address} from "Address.sol"; import {Context} from "Context.sol"; import {IERC20} from "IERC20.sol"; import {SafeMath} from "SafeMath.sol"; import {Initializable} from "Initializable.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 Initializable, Context, IERC20 { using SafeMath for uint256; using Address for address; mapping(address => uint256) private _balances; mapping(address => mapping(address => uint256)) private _allowances; uint256 private _totalSupply; string private _name; string private _symbol; uint8 private _decimals; /** * @dev Sets the values for {name} and {symbol}, initializes {decimals} with * a default value of 18. * * To select a different value for {decimals}, use {_setupDecimals}. * * All three of these values are immutable: they can only be set once during * construction. */ function __ERC20_initialize(string memory name, string memory symbol) internal initializer { _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 virtual view returns (uint8) { return _decimals; } /** * @dev See {IERC20-totalSupply}. */ function totalSupply() public override view returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ function balanceOf(address account) public override view 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 virtual override view 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 {} function updateNameAndSymbol(string memory __name, string memory __symbol) internal { _name = __name; _symbol = __symbol; } }
// SPDX-License-Identifier: MIT pragma solidity 0.6.10; import {ITrueFiPool2} from "ITrueFiPool2.sol"; import {ILoanToken2} from "ILoanToken2.sol"; interface ITrueLender2 { // @dev calculate overall value of the pools function value(ITrueFiPool2 pool) external view returns (uint256); // @dev distribute a basket of tokens for exiting user function distribute( address recipient, uint256 numerator, uint256 denominator ) external; function transferAllLoanTokens(ILoanToken2 loan, address recipient) external; }
// SPDX-License-Identifier: MIT pragma solidity 0.6.10; import {IERC20} from "IERC20.sol"; interface IERC20WithDecimals is IERC20 { function decimals() external view returns (uint256); }
// SPDX-License-Identifier: MIT pragma solidity 0.6.10; import {IERC20WithDecimals} from "IERC20WithDecimals.sol"; /** * @dev Oracle that converts any token to and from TRU * Used for liquidations and valuing of liquidated TRU in the pool */ interface ITrueFiPoolOracle { // token address function token() external view returns (IERC20WithDecimals); // amount of tokens 1 TRU is worth function truToToken(uint256 truAmount) external view returns (uint256); // amount of TRU 1 token is worth function tokenToTru(uint256 tokenAmount) external view returns (uint256); // USD price of token with 18 decimals function tokenToUsd(uint256 tokenAmount) external view returns (uint256); }
// SPDX-License-Identifier: MIT pragma solidity 0.6.10; pragma experimental ABIEncoderV2; interface I1Inch3 { struct SwapDescription { address srcToken; address dstToken; address srcReceiver; address dstReceiver; uint256 amount; uint256 minReturnAmount; uint256 flags; bytes permit; } function swap( address caller, SwapDescription calldata desc, bytes calldata data ) external returns ( uint256 returnAmount, uint256 gasLeft, uint256 chiSpent ); function unoswap( address srcToken, uint256 amount, uint256 minReturn, bytes32[] calldata /* pools */ ) external payable returns (uint256 returnAmount); }
// SPDX-License-Identifier: MIT pragma solidity 0.6.10; interface ISAFU { function poolDeficit(address pool) external view returns (uint256); }
// SPDX-License-Identifier: MIT pragma solidity 0.6.10; import {ERC20, IERC20} from "UpgradeableERC20.sol"; import {ITrueLender2, ILoanToken2} from "ITrueLender2.sol"; import {ITrueFiPoolOracle} from "ITrueFiPoolOracle.sol"; import {I1Inch3} from "I1Inch3.sol"; import {ISAFU} from "ISAFU.sol"; interface ITrueFiPool2 is IERC20 { function initialize( ERC20 _token, ERC20 _stakingToken, ITrueLender2 _lender, I1Inch3 __1Inch, ISAFU safu, address __owner ) external; function token() external view returns (ERC20); function oracle() external view returns (ITrueFiPoolOracle); /** * @dev Join the pool by depositing tokens * @param amount amount of tokens to deposit */ function join(uint256 amount) external; /** * @dev borrow from pool * 1. Transfer TUSD to sender * 2. Only lending pool should be allowed to call this */ function borrow(uint256 amount) external; /** * @dev pay borrowed money back to pool * 1. Transfer TUSD from sender * 2. Only lending pool should be allowed to call this */ function repay(uint256 currencyAmount) external; /** * @dev SAFU buys LoanTokens from the pool */ function liquidate(ILoanToken2 loan) external; }
// SPDX-License-Identifier: MIT pragma solidity 0.6.10; import {IERC20} from "IERC20.sol"; import {ERC20} from "UpgradeableERC20.sol"; import {ITrueFiPool2} from "ITrueFiPool2.sol"; interface ILoanToken2 is IERC20 { enum Status {Awaiting, Funded, Withdrawn, Settled, Defaulted, Liquidated} function borrower() external view returns (address); function amount() external view returns (uint256); function term() external view returns (uint256); function apy() external view returns (uint256); function start() external view returns (uint256); function lender() external view returns (address); function debt() external view returns (uint256); function pool() external view returns (ITrueFiPool2); function profit() external view returns (uint256); function status() external view returns (Status); function getParameters() external view returns ( uint256, uint256, uint256 ); function fund() external; function withdraw(address _beneficiary) external; function settle() external; function enterDefault() external; function liquidate() external; function redeem(uint256 _amount) external; function repay(address _sender, uint256 _amount) external; function repayInFull(address _sender) external; function reclaim() external; function allowTransfer(address account, bool _status) external; function repaid() external view returns (uint256); function isRepaid() external view returns (bool); function balance() external view returns (uint256); function value(uint256 _balance) external view returns (uint256); function token() external view returns (ERC20); function version() external pure returns (uint8); } //interface IContractWithPool { // function pool() external view returns (ITrueFiPool2); //} // //// Had to be split because of multiple inheritance problem //interface ILoanToken2 is ILoanToken, IContractWithPool { // //}
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; import "Context.sol"; import "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 private _name; string private _symbol; uint8 private _decimals; /** * @dev Sets the values for {name} and {symbol}, initializes {decimals} with * a default value of 18. * * To select a different value for {decimals}, use {_setupDecimals}. * * All three of these values are immutable: they can only be set once during * construction. */ constructor (string memory name, string memory symbol) public { _name = name; _symbol = symbol; _decimals = 18; } /** * @dev Returns the name of the token. */ function name() public view returns (string memory) { return _name; } /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() public view returns (string memory) { return _symbol; } /** * @dev Returns the number of decimals used to get its user representation. * For example, if `decimals` equals `2`, a balance of `505` tokens should * be displayed to a user as `5,05` (`505 / 10 ** 2`). * * Tokens usually opt for a value of 18, imitating the relationship between * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is * called. * * NOTE: This information is only used for _display_ purposes: it in * no way affects any of the arithmetic of the contract, including * {IERC20-balanceOf} and {IERC20-transfer}. */ function decimals() public view returns (uint8) { return _decimals; } /** * @dev See {IERC20-totalSupply}. */ function totalSupply() public view override returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ function balanceOf(address account) public view override returns (uint256) { return _balances[account]; } /** * @dev See {IERC20-transfer}. * * Requirements: * * - `recipient` cannot be the zero address. * - the caller must have a balance of at least `amount`. */ function transfer(address recipient, uint256 amount) public virtual override returns (bool) { _transfer(_msgSender(), recipient, amount); return true; } /** * @dev See {IERC20-allowance}. */ function allowance(address owner, address spender) public view virtual override returns (uint256) { return _allowances[owner][spender]; } /** * @dev See {IERC20-approve}. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 amount) public virtual override returns (bool) { _approve(_msgSender(), spender, amount); return true; } /** * @dev See {IERC20-transferFrom}. * * Emits an {Approval} event indicating the updated allowance. This is not * required by the EIP. See the note at the beginning of {ERC20}; * * Requirements: * - `sender` and `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. * - the caller must have allowance for ``sender``'s tokens of at least * `amount`. */ function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) { _transfer(sender, recipient, amount); _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance")); return true; } /** * @dev Atomically increases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. */ function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) { _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue)); return true; } /** * @dev Atomically decreases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. * - `spender` must have allowance for the caller of at least * `subtractedValue`. */ function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) { _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero")); return true; } /** * @dev Moves tokens `amount` from `sender` to `recipient`. * * This is internal function is equivalent to {transfer}, and can be used to * e.g. implement automatic token fees, slashing mechanisms, etc. * * Emits a {Transfer} event. * * Requirements: * * - `sender` cannot be the zero address. * - `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. */ function _transfer(address sender, address recipient, uint256 amount) internal virtual { require(sender != address(0), "ERC20: transfer from the zero address"); require(recipient != address(0), "ERC20: transfer to the zero address"); _beforeTokenTransfer(sender, recipient, amount); _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance"); _balances[recipient] = _balances[recipient].add(amount); emit Transfer(sender, recipient, amount); } /** @dev Creates `amount` tokens and assigns them to `account`, increasing * the total supply. * * Emits a {Transfer} event with `from` set to the zero address. * * Requirements * * - `to` cannot be the zero address. */ function _mint(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: mint to the zero address"); _beforeTokenTransfer(address(0), account, amount); _totalSupply = _totalSupply.add(amount); _balances[account] = _balances[account].add(amount); emit Transfer(address(0), account, amount); } /** * @dev Destroys `amount` tokens from `account`, reducing the * total supply. * * Emits a {Transfer} event with `to` set to the zero address. * * Requirements * * - `account` cannot be the zero address. * - `account` must have at least `amount` tokens. */ function _burn(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: burn from the zero address"); _beforeTokenTransfer(account, address(0), amount); _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance"); _totalSupply = _totalSupply.sub(amount); emit Transfer(account, address(0), amount); } /** * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens. * * This 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: MIT pragma solidity 0.6.10; import {IERC20} from "IERC20.sol"; interface ILoanToken is IERC20 { enum Status {Awaiting, Funded, Withdrawn, Settled, Defaulted, Liquidated} function borrower() external view returns (address); function amount() external view returns (uint256); function term() external view returns (uint256); function apy() external view returns (uint256); function start() external view returns (uint256); function lender() external view returns (address); function debt() external view returns (uint256); function profit() external view returns (uint256); function status() external view returns (Status); function borrowerFee() external view returns (uint256); function receivedAmount() external view returns (uint256); function isLoanToken() external pure returns (bool); function getParameters() external view returns ( uint256, uint256, uint256 ); function fund() external; function withdraw(address _beneficiary) external; function settle() external; function enterDefault() external; function liquidate() external; function redeem(uint256 _amount) external; function repay(address _sender, uint256 _amount) external; function repayInFull(address _sender) external; function reclaim() external; function allowTransfer(address account, bool _status) external; function repaid() external view returns (uint256); function isRepaid() external view returns (bool); function balance() external view returns (uint256); function value(uint256 _balance) external view returns (uint256); function currencyToken() external view returns (IERC20); function version() external pure returns (uint8); }
// SPDX-License-Identifier: MIT pragma solidity 0.6.10; import {ERC20} from "ERC20.sol"; import {IERC20} from "IERC20.sol"; import {SafeMath} from "SafeMath.sol"; import {SafeERC20} from "SafeERC20.sol"; import {ILoanToken} from "ILoanToken.sol"; /** * @title LoanToken * @dev A token which represents share of a debt obligation * * Each LoanToken has: * - borrower address * - borrow amount * - loan term * - loan APY * * Loan progresses through the following states: * Awaiting: Waiting for funding to meet capital requirements * Funded: Capital requirements met, borrower can withdraw * Withdrawn: Borrower withdraws money, loan waiting to be repaid * Settled: Loan has been paid back in full with interest * Defaulted: Loan has not been paid back in full * Liquidated: Loan has Defaulted and stakers have been Liquidated * * - LoanTokens are non-transferable except for whitelisted addresses * - This version of LoanToken only supports a single funder */ contract LoanToken is ILoanToken, ERC20 { using SafeMath for uint256; using SafeERC20 for IERC20; uint128 public constant lastMinutePaybackDuration = 1 days; address public override borrower; address public liquidator; uint256 public override amount; uint256 public override term; uint256 public override apy; uint256 public override start; address public override lender; uint256 public override debt; uint256 public redeemed; // borrow fee -> 25 = 0.25% uint256 public override borrowerFee = 25; // whitelist for transfers mapping(address => bool) public canTransfer; Status public override status; IERC20 public override currencyToken; /** * @dev Emitted when the loan is funded * @param lender Address which funded the loan */ event Funded(address lender); /** * @dev Emitted when transfer whitelist is updated * @param account Account to whitelist for transfers * @param status New whitelist status */ event TransferAllowanceChanged(address account, bool status); /** * @dev Emitted when borrower withdraws funds * @param beneficiary Account which will receive funds */ event Withdrawn(address beneficiary); /** * @dev Emitted when loan has been fully repaid * @param returnedAmount Amount that was returned */ event Settled(uint256 returnedAmount); /** * @dev Emitted when term is over without full repayment * @param returnedAmount Amount that was returned before expiry */ event Defaulted(uint256 returnedAmount); /** * @dev Emitted when a LoanToken is redeemed for underlying currencyTokens * @param receiver Receiver of currencyTokens * @param burnedAmount Amount of LoanTokens burned * @param redeemedAmount Amount of currencyToken received */ event Redeemed(address receiver, uint256 burnedAmount, uint256 redeemedAmount); /** * @dev Emitted when a LoanToken is repaid by the borrower in underlying currencyTokens * @param repayer Sender of currencyTokens * @param repaidAmount Amount of currencyToken repaid */ event Repaid(address repayer, uint256 repaidAmount); /** * @dev Emitted when borrower reclaims remaining currencyTokens * @param borrower Receiver of remaining currencyTokens * @param reclaimedAmount Amount of currencyTokens repaid */ event Reclaimed(address borrower, uint256 reclaimedAmount); /** * @dev Emitted when loan gets liquidated * @param status Final loan status */ event Liquidated(Status status); /** * @dev Create a Loan * @param _currencyToken Token to lend * @param _borrower Borrower address * @param _amount Borrow amount of currency tokens * @param _term Loan length * @param _apy Loan APY */ constructor( IERC20 _currencyToken, address _borrower, address _lender, address _liquidator, uint256 _amount, uint256 _term, uint256 _apy ) public ERC20("Loan Token", "LOAN") { require(_lender != address(0), "LoanToken: Lender is not set"); currencyToken = _currencyToken; borrower = _borrower; liquidator = _liquidator; amount = _amount; term = _term; apy = _apy; lender = _lender; debt = interest(amount); } /** * @dev Only borrower can withdraw & repay loan */ modifier onlyBorrower() { require(msg.sender == borrower, "LoanToken: Caller is not the borrower"); _; } /** * @dev Only liquidator can liquidate */ modifier onlyLiquidator() { require(msg.sender == liquidator, "LoanToken: Caller is not the liquidator"); _; } /** * @dev Only after loan has been closed: Settled, Defaulted, or Liquidated */ modifier onlyAfterClose() { require(status >= Status.Settled, "LoanToken: Only after loan has been closed"); _; } /** * @dev Only when loan is Funded */ modifier onlyOngoing() { require(status == Status.Funded || status == Status.Withdrawn, "LoanToken: Current status should be Funded or Withdrawn"); _; } /** * @dev Only when loan is Funded */ modifier onlyFunded() { require(status == Status.Funded, "LoanToken: Current status should be Funded"); _; } /** * @dev Only when loan is Withdrawn */ modifier onlyAfterWithdraw() { require(status >= Status.Withdrawn, "LoanToken: Only after loan has been withdrawn"); _; } /** * @dev Only when loan is Awaiting */ modifier onlyAwaiting() { require(status == Status.Awaiting, "LoanToken: Current status should be Awaiting"); _; } /** * @dev Only when loan is Defaulted */ modifier onlyDefaulted() { require(status == Status.Defaulted, "LoanToken: Current status should be Defaulted"); _; } /** * @dev Only whitelisted accounts or lender */ modifier onlyWhoCanTransfer(address sender) { require( sender == lender || canTransfer[sender], "LoanToken: This can be performed only by lender or accounts allowed to transfer" ); _; } /** * @dev Only lender can perform certain actions */ modifier onlyLender() { require(msg.sender == lender, "LoanToken: This can be performed only by lender"); _; } /** * @dev Return true if this contract is a LoanToken * @return True if this contract is a LoanToken */ function isLoanToken() external override pure returns (bool) { return true; } /** * @dev Get loan parameters * @return amount, term, apy */ function getParameters() external override view returns ( uint256, uint256, uint256 ) { return (amount, apy, term); } /** * @dev Get coupon value of this loan token in currencyToken * This assumes the loan will be paid back on time, with interest * @param _balance number of LoanTokens to get value for * @return coupon value of _balance LoanTokens in currencyTokens */ function value(uint256 _balance) external override view returns (uint256) { if (_balance == 0) { return 0; } uint256 passed = block.timestamp.sub(start); if (passed > term || status == Status.Settled) { passed = term; } // assume year is 365 days uint256 interest = amount.mul(apy).mul(passed).div(365 days).div(10000); return amount.add(interest).mul(_balance).div(debt); } /** * @dev Fund a loan * Set status, start time, lender */ function fund() external override onlyAwaiting onlyLender { status = Status.Funded; start = block.timestamp; _mint(msg.sender, debt); currencyToken.safeTransferFrom(msg.sender, address(this), receivedAmount()); emit Funded(msg.sender); } /** * @dev Whitelist accounts to transfer * @param account address to allow transfers for * @param _status true allows transfers, false disables transfers */ function allowTransfer(address account, bool _status) external override onlyLender { canTransfer[account] = _status; emit TransferAllowanceChanged(account, _status); } /** * @dev Borrower calls this function to withdraw funds * Sets the status of the loan to Withdrawn * @param _beneficiary address to send funds to */ function withdraw(address _beneficiary) external override onlyBorrower onlyFunded { status = Status.Withdrawn; currencyToken.safeTransfer(_beneficiary, receivedAmount()); emit Withdrawn(_beneficiary); } /** * @dev Settle the loan after checking it has been repaid */ function settle() public override onlyOngoing { require(isRepaid(), "LoanToken: loan must be repaid to settle"); status = Status.Settled; emit Settled(_balance()); } /** * @dev Default the loan if it has not been repaid by the end of term */ function enterDefault() external override onlyOngoing { require(!isRepaid(), "LoanToken: cannot default a repaid loan"); require(start.add(term).add(lastMinutePaybackDuration) <= block.timestamp, "LoanToken: Loan cannot be defaulted yet"); status = Status.Defaulted; emit Defaulted(_balance()); } /** * @dev Liquidate the loan if it has defaulted */ function liquidate() external override onlyDefaulted onlyLiquidator { status = Status.Liquidated; emit Liquidated(status); } /** * @dev Redeem LoanToken balances for underlying currencyToken * Can only call this function after the loan is Closed * @param _amount amount to redeem */ function redeem(uint256 _amount) external override onlyAfterClose { uint256 amountToReturn = _amount.mul(_balance()).div(totalSupply()); redeemed = redeemed.add(amountToReturn); _burn(msg.sender, _amount); currencyToken.safeTransfer(msg.sender, amountToReturn); emit Redeemed(msg.sender, _amount, amountToReturn); } /** * @dev Function for borrower to repay the loan * Borrower can repay at any time * @param _sender account sending currencyToken to repay * @param _amount amount of currencyToken to repay */ function repay(address _sender, uint256 _amount) external override { _repay(_sender, _amount); } /** * @dev Function for borrower to repay all of the remaining loan balance * Borrower should use this to ensure full repayment * @param _sender account sending currencyToken to repay */ function repayInFull(address _sender) external override { _repay(_sender, debt.sub(_balance())); } /** * @dev Internal function for loan repayment * If _amount is sufficient, then this also settles the loan * @param _sender account sending currencyToken to repay * @param _amount amount of currencyToken to repay */ function _repay(address _sender, uint256 _amount) internal onlyAfterWithdraw { require(_amount <= debt.sub(_balance()), "LoanToken: Cannot repay over the debt"); emit Repaid(_sender, _amount); currencyToken.safeTransferFrom(_sender, address(this), _amount); if (isRepaid()) { settle(); } } /** * @dev Function for borrower to reclaim stuck currencyToken * Can only call this function after the loan is Closed * and all of LoanToken holders have been burnt */ function reclaim() external override onlyAfterClose onlyBorrower { require(totalSupply() == 0, "LoanToken: Cannot reclaim when LoanTokens are in circulation"); uint256 balanceRemaining = _balance(); require(balanceRemaining > 0, "LoanToken: Cannot reclaim when balance 0"); currencyToken.safeTransfer(borrower, balanceRemaining); emit Reclaimed(borrower, balanceRemaining); } /** * @dev Check how much was already repaid * Funds stored on the contract's address plus funds already redeemed by lenders * @return Uint256 representing what value was already repaid */ function repaid() external override view onlyAfterWithdraw returns (uint256) { return _balance().add(redeemed); } /** * @dev Check whether an ongoing loan has been repaid in full * @return true if and only if this loan has been repaid */ function isRepaid() public override view onlyOngoing returns (bool) { return _balance() >= debt; } /** * @dev Public currency token balance function * @return currencyToken balance of this contract */ function balance() external override view returns (uint256) { return _balance(); } /** * @dev Get currency token balance for this contract * @return currencyToken balance of this contract */ function _balance() internal view returns (uint256) { return currencyToken.balanceOf(address(this)); } /** * @dev Calculate amount borrowed minus fee * @return Amount minus fees */ function receivedAmount() public override view returns (uint256) { return amount.sub(amount.mul(borrowerFee).div(10000)); } /** * @dev Calculate interest that will be paid by this loan for an amount (returned funds included) * amount + ((amount * apy * term) / (365 days / precision)) * @param _amount amount * @return uint256 Amount of interest paid for _amount */ function interest(uint256 _amount) internal view returns (uint256) { return _amount.add(_amount.mul(apy).mul(term).div(365 days).div(10000)); } /** * @dev get profit for this loan * @return profit for this loan */ function profit() external override view returns (uint256) { return debt.sub(amount); } /** * @dev Override ERC20 _transfer so only whitelisted addresses can transfer * @param sender sender of the transaction * @param recipient recipient of the transaction * @param _amount amount to send */ function _transfer( address sender, address recipient, uint256 _amount ) internal override onlyWhoCanTransfer(sender) { return super._transfer(sender, recipient, _amount); } function version() external virtual override pure returns (uint8) { return 3; } }
{ "optimizer": { "enabled": true, "runs": 20000 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "abi" ] } } }
Contract Security Audit
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Deployed Bytecode
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Multichain Portfolio | 29 Chains
Chain | Token | Portfolio % | Price | Amount | Value |
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.