76aa419320
- CCIP/trustless bridge contracts, GRU tokens, DEX/PMM tests, reserve vault. - Token-aggregation service routes, planner, chain config, relay env templates. - Config snapshots and multi-chain deployment markdown updates. - gitignore services/btc-intake/dist/ (tsc output); do not track dist. Run forge build && forge test before deploy (large solc graph). Made-with: Cursor
74 lines
2.8 KiB
Solidity
74 lines
2.8 KiB
Solidity
// SPDX-License-Identifier: MIT
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pragma solidity ^0.8.20;
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import {IERC3156FlashBorrower} from "@openzeppelin/contracts/interfaces/IERC3156FlashBorrower.sol";
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import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
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import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
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import {ICrossChainFlashBridge} from "./interfaces/ICrossChainFlashBridge.sol";
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/**
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* @title CrossChainFlashBorrower
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* @notice ERC-3156 borrower: flash `token` on **this** chain → bridge `bridgeAmount` out → repay `amount + fee` to the flash vault from **on-hand** balance.
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* @dev **Atomicity is single-chain only.** CCIP / bridge finality is asynchronous; destination delivery cannot complete inside this callback.
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* **Prefunding:** before `flashLoan`, this contract should hold at least `bridgeAmount + fee` of `token`
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* (or `amount + fee` if `bridgeAmount == amount`) so repayment succeeds after the bridge pulls `bridgeAmount`.
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* Encode `CrossChainFlashParams` in `data`.
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*/
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contract CrossChainFlashBorrower is IERC3156FlashBorrower {
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using SafeERC20 for IERC20;
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bytes32 private constant _RETURN_VALUE = keccak256("ERC3156FlashBorrower.onFlashLoan");
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address public immutable trustedLender;
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struct CrossChainFlashParams {
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address bridge;
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uint256 bridgeAmount;
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uint64 destinationChainSelector;
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address recipientOnDestination;
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bytes bridgeExtraData;
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uint256 nativeBridgeFee;
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}
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error UntrustedLender();
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error BadParams();
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error InsufficientToRepay();
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constructor(address trustedLender_) {
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trustedLender = trustedLender_;
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}
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function onFlashLoan(
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address,
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address token,
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uint256 amount,
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uint256 fee,
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bytes calldata data
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) external override returns (bytes32) {
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if (msg.sender != trustedLender) revert UntrustedLender();
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_run(abi.decode(data, (CrossChainFlashParams)), token, amount, fee);
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return _RETURN_VALUE;
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}
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function _run(CrossChainFlashParams memory p, address token, uint256 amount, uint256 fee) internal {
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if (p.bridge == address(0) || p.recipientOnDestination == address(0)) revert BadParams();
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if (p.bridgeAmount == 0 || p.bridgeAmount > amount) revert BadParams();
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IERC20 t = IERC20(token);
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t.forceApprove(p.bridge, p.bridgeAmount);
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ICrossChainFlashBridge(p.bridge).bridgeTokensFrom{value: p.nativeBridgeFee}(
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token,
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p.bridgeAmount,
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p.destinationChainSelector,
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p.recipientOnDestination,
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p.bridgeExtraData
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);
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uint256 need = amount + fee;
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if (t.balanceOf(address(this)) < need) revert InsufficientToRepay();
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t.safeTransfer(msg.sender, need);
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}
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receive() external payable {}
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}
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