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src/contracts/facilitators/gsm/dependencies/USTB/ISubscription.sol
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| // Simple minimal interface for subscriptions of USTB | ||
| pragma solidity ^0.8.10; | ||
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| interface ISubscription { | ||
| /** | ||
| * @notice Subscribes an amount of USTB in exchange for USDC | ||
| * @param amount The amount of USDC to subscribe | ||
| * @param stablecoin The address of the stablecoin to calculate with | ||
| */ | ||
| function subscribe(uint256 inAmount, address stablecoin) external; | ||
| } |
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| pragma solidity ^0.8.10; | ||
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| import {IERC20} from '@openzeppelin/contracts/token/ERC20/IERC20.sol'; | ||
| import {SafeERC20} from '@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol'; | ||
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| /** | ||
| * @title MockUSTBSubscription | ||
| */ | ||
| contract MockUSTBSubscription { | ||
| using SafeERC20 for IERC20; | ||
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| uint256 constant USDC_PRECISION = 1e6; | ||
| uint256 constant SUPERSTATE_TOKEN_PRECISION = 1e6; | ||
| uint256 constant CHAINLINK_FEED_PRECISION = 1e8; | ||
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| address public immutable asset; | ||
| address public immutable liquidity; | ||
| uint256 public USTBPrice; // 1_100_000_000 is 1 USTB = 11 USDC, including chainlink precision | ||
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| /** | ||
| * @param _asset Address of asset token, ie USTB | ||
| * @param _liquidity Address of liquidity token, ie USDC | ||
| */ | ||
| constructor(address _asset, address _liquidity, uint256 _price) { | ||
| asset = _asset; | ||
| liquidity = _liquidity; | ||
| setUSTBPrice(_price); | ||
| } | ||
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| function test_coverage_ignore() public virtual { | ||
| // Intentionally left blank. | ||
| // Excludes contract from coverage. | ||
| } | ||
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| /** | ||
| * @notice The ```subscribe``` function takes in stablecoins and mints SuperstateToken in the proper amount for the msg.sender depending on the current Net Asset Value per Share. | ||
| * @param inAmount The amount of the stablecoin in | ||
| * @param stablecoin The address of the stablecoin to calculate with | ||
| */ | ||
| function subscribe(uint256 inAmount, address stablecoin) external { | ||
| ( | ||
| uint256 superstateTokenOutAmount, | ||
| uint256 stablecoinInAmountAfterFee, | ||
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| ) = calculateSuperstateTokenOut({inAmount: inAmount, stablecoin: stablecoin}); | ||
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| IERC20(stablecoin).safeTransferFrom({from: msg.sender, to: address(this), value: inAmount}); | ||
| IERC20(asset).safeTransfer(msg.sender, superstateTokenOutAmount); | ||
| } | ||
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| /** | ||
| * @notice The ```calculateSuperstateTokenOut``` function calculates the total amount of Superstate tokens you'll receive for the inAmount of stablecoin. Treats all stablecoins as if they are always worth a dollar. | ||
| * @param inAmount The amount of the stablecoin in | ||
| * @param stablecoin The address of the stablecoin to calculate with | ||
| * @return superstateTokenOutAmount The amount of Superstate tokens received for inAmount of stablecoin | ||
| * @return stablecoinInAmountAfterFee The amount of the stablecoin in after any fees | ||
| * @return feeOnStablecoinInAmount The amount of the stablecoin taken in fees | ||
| */ | ||
| function calculateSuperstateTokenOut( | ||
| uint256 inAmount, | ||
| address stablecoin | ||
| ) | ||
| public | ||
| view | ||
| returns ( | ||
| uint256 superstateTokenOutAmount, | ||
| uint256 stablecoinInAmountAfterFee, | ||
| uint256 feeOnStablecoinInAmount | ||
| ) | ||
| { | ||
| StablecoinConfig memory config = supportedStablecoins[stablecoin]; | ||
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| feeOnStablecoinInAmount = 0; | ||
| stablecoinInAmountAfterFee = inAmount - feeOnStablecoinInAmount; | ||
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| usdPerSuperstateTokenChainlinkRaw = USTBPrice; // 9.5 USDC/SUPERSTATE_TOKEN | ||
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| uint256 stablecoinPrecision = 10 ** 6; | ||
| uint256 chainlinkFeedPrecision = 10 ** 8; | ||
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| // converts from a USD amount to a SUPERSTATE_TOKEN amount | ||
| superstateTokenOutAmount = | ||
| (stablecoinInAmountAfterFee * chainlinkFeedPrecision * SUPERSTATE_TOKEN_PRECISION) / | ||
| (usdPerSuperstateTokenChainlinkRaw * stablecoinPrecision); | ||
| } | ||
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| /** | ||
| * @notice Set the price of USTB, amount of USDC for 1 USTB. USTB/USDC both have 6 decimals. | ||
| * @param newPrice The new price of USTB | ||
| */ | ||
| function setUSTBPrice(uint256 newPrice) public { | ||
| USTBPrice = newPrice; | ||
| } | ||
| } |
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