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All notable changes to this project will be documented in this file. | ||
See [Conventional Commits](https://conventionalcommits.org) for commit guidelines. | ||
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# [0.4.0](https://github.com/synapsecns/sanguine/compare/[email protected]@0.4.0) (2024-09-20) | ||
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### Features | ||
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* **contracts-rfq:** relay/prove/claim with different address [SLT-130] ([#3138](https://github.com/synapsecns/sanguine/issues/3138)) ([23f6c4c](https://github.com/synapsecns/sanguine/commit/23f6c4c652743c5ca7a184ad730ce19af3600a9c)) | ||
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# [0.3.0](https://github.com/synapsecns/sanguine/compare/[email protected]@0.3.0) (2024-09-10) | ||
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// SPDX-License-Identifier: MIT | ||
pragma solidity 0.8.24; | ||
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import {SafeERC20, IERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol"; | ||
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import "./libs/Errors.sol"; | ||
import {UniversalTokenLib} from "./libs/UniversalToken.sol"; | ||
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import {Admin} from "./Admin.sol"; | ||
import {IFastBridge} from "./interfaces/IFastBridge.sol"; | ||
import {IFastBridgeV2} from "./interfaces/IFastBridgeV2.sol"; | ||
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contract FastBridgeV2 is Admin, IFastBridgeV2 { | ||
using SafeERC20 for IERC20; | ||
using UniversalTokenLib for address; | ||
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/// @notice Dispute period for relayed transactions | ||
uint256 public constant DISPUTE_PERIOD = 30 minutes; | ||
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/// @notice Delay for a transaction after which it could be permisionlessly refunded | ||
uint256 public constant REFUND_DELAY = 7 days; | ||
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/// @notice Minimum deadline period to relay a requested bridge transaction | ||
uint256 public constant MIN_DEADLINE_PERIOD = 30 minutes; | ||
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enum BridgeStatus { | ||
NULL, // doesn't exist yet | ||
REQUESTED, | ||
RELAYER_PROVED, | ||
RELAYER_CLAIMED, | ||
REFUNDED | ||
} | ||
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/// @notice Status of the bridge tx on origin chain | ||
mapping(bytes32 => BridgeStatus) public bridgeStatuses; | ||
/// @notice Proof of relayed bridge tx on origin chain | ||
mapping(bytes32 => BridgeProof) public bridgeProofs; | ||
/// @notice Whether bridge has been relayed on destination chain | ||
mapping(bytes32 => bool) public bridgeRelays; | ||
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/// @dev to prevent replays | ||
uint256 public nonce; | ||
// @dev the block the contract was deployed at | ||
uint256 public immutable deployBlock; | ||
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constructor(address _owner) Admin(_owner) { | ||
deployBlock = block.number; | ||
} | ||
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/// @notice Pulls a requested token from the user to the requested recipient. | ||
/// @dev Be careful of re-entrancy issues when msg.value > 0 and recipient != address(this) | ||
function _pullToken(address recipient, address token, uint256 amount) internal returns (uint256 amountPulled) { | ||
if (token != UniversalTokenLib.ETH_ADDRESS) { | ||
token.assertIsContract(); | ||
// Record token balance before transfer | ||
amountPulled = IERC20(token).balanceOf(recipient); | ||
// Token needs to be pulled only if msg.value is zero | ||
// This way user can specify WETH as the origin asset | ||
IERC20(token).safeTransferFrom(msg.sender, recipient, amount); | ||
// Use the difference between the recorded balance and the current balance as the amountPulled | ||
amountPulled = IERC20(token).balanceOf(recipient) - amountPulled; | ||
} else { | ||
// Otherwise, we need to check that ETH amount matches msg.value | ||
if (amount != msg.value) revert MsgValueIncorrect(); | ||
// Transfer value to recipient if not this address | ||
if (recipient != address(this)) token.universalTransfer(recipient, amount); | ||
// We will forward msg.value in the external call later, if recipient is not this contract | ||
amountPulled = msg.value; | ||
} | ||
} | ||
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/// @inheritdoc IFastBridge | ||
function getBridgeTransaction(bytes memory request) public pure returns (BridgeTransaction memory) { | ||
return abi.decode(request, (BridgeTransaction)); | ||
} | ||
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/// @inheritdoc IFastBridge | ||
function bridge(BridgeParams memory params) external payable { | ||
// check bridge params | ||
if (params.dstChainId == block.chainid) revert ChainIncorrect(); | ||
if (params.originAmount == 0 || params.destAmount == 0) revert AmountIncorrect(); | ||
if (params.originToken == address(0) || params.destToken == address(0)) revert ZeroAddress(); | ||
if (params.deadline < block.timestamp + MIN_DEADLINE_PERIOD) revert DeadlineTooShort(); | ||
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// transfer tokens to bridge contract | ||
// @dev use returned originAmount in request in case of transfer fees | ||
uint256 originAmount = _pullToken(address(this), params.originToken, params.originAmount); | ||
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// track amount of origin token owed to protocol | ||
uint256 originFeeAmount; | ||
if (protocolFeeRate > 0) originFeeAmount = (originAmount * protocolFeeRate) / FEE_BPS; | ||
originAmount -= originFeeAmount; // remove from amount used in request as not relevant for relayers | ||
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// set status to requested | ||
bytes memory request = abi.encode( | ||
BridgeTransaction({ | ||
originChainId: uint32(block.chainid), | ||
destChainId: params.dstChainId, | ||
originSender: params.sender, | ||
destRecipient: params.to, | ||
originToken: params.originToken, | ||
destToken: params.destToken, | ||
originAmount: originAmount, | ||
destAmount: params.destAmount, | ||
originFeeAmount: originFeeAmount, | ||
sendChainGas: params.sendChainGas, | ||
deadline: params.deadline, | ||
nonce: nonce++ // increment nonce on every bridge | ||
}) | ||
); | ||
bytes32 transactionId = keccak256(request); | ||
bridgeStatuses[transactionId] = BridgeStatus.REQUESTED; | ||
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emit BridgeRequested( | ||
transactionId, | ||
params.sender, | ||
request, | ||
params.dstChainId, | ||
params.originToken, | ||
params.destToken, | ||
originAmount, | ||
params.destAmount, | ||
params.sendChainGas | ||
); | ||
} | ||
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/// @inheritdoc IFastBridge | ||
function relay(bytes memory request) external payable { | ||
relay(request, msg.sender); | ||
} | ||
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/// @inheritdoc IFastBridgeV2 | ||
function relay(bytes memory request, address relayer) public payable { | ||
bytes32 transactionId = keccak256(request); | ||
BridgeTransaction memory transaction = getBridgeTransaction(request); | ||
if (transaction.destChainId != uint32(block.chainid)) revert ChainIncorrect(); | ||
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// check haven't exceeded deadline for relay to happen | ||
if (block.timestamp > transaction.deadline) revert DeadlineExceeded(); | ||
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// mark bridge transaction as relayed | ||
if (bridgeRelays[transactionId]) revert TransactionRelayed(); | ||
bridgeRelays[transactionId] = true; | ||
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// transfer tokens to recipient on destination chain and gas rebate if requested | ||
address to = transaction.destRecipient; | ||
address token = transaction.destToken; | ||
uint256 amount = transaction.destAmount; | ||
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uint256 rebate = chainGasAmount; | ||
if (!transaction.sendChainGas) { | ||
// forward erc20 | ||
rebate = 0; | ||
_pullToken(to, token, amount); | ||
} else if (token == UniversalTokenLib.ETH_ADDRESS) { | ||
// lump in gas rebate into amount in native gas token | ||
_pullToken(to, token, amount + rebate); | ||
} else { | ||
// forward erc20 then forward gas rebate in native gas token | ||
_pullToken(to, token, amount); | ||
_pullToken(to, UniversalTokenLib.ETH_ADDRESS, rebate); | ||
} | ||
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emit BridgeRelayed( | ||
transactionId, | ||
relayer, | ||
to, | ||
transaction.originChainId, | ||
transaction.originToken, | ||
transaction.destToken, | ||
transaction.originAmount, | ||
transaction.destAmount, | ||
rebate | ||
); | ||
} | ||
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/// @inheritdoc IFastBridge | ||
function prove(bytes memory request, bytes32 destTxHash) external { | ||
prove(request, destTxHash, msg.sender); | ||
} | ||
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/// @inheritdoc IFastBridgeV2 | ||
function prove(bytes memory request, bytes32 destTxHash, address relayer) public onlyRole(RELAYER_ROLE) { | ||
bytes32 transactionId = keccak256(request); | ||
// update bridge tx status given proof provided | ||
if (bridgeStatuses[transactionId] != BridgeStatus.REQUESTED) revert StatusIncorrect(); | ||
bridgeStatuses[transactionId] = BridgeStatus.RELAYER_PROVED; | ||
bridgeProofs[transactionId] = BridgeProof({timestamp: uint96(block.timestamp), relayer: relayer}); // overflow ok | ||
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emit BridgeProofProvided(transactionId, relayer, destTxHash); | ||
} | ||
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/// @notice Calculates time since proof submitted | ||
/// @dev proof.timestamp stores casted uint96(block.timestamp) block timestamps for gas optimization | ||
/// _timeSince(proof) can accomodate rollover case when block.timestamp > type(uint96).max but | ||
/// proof.timestamp < type(uint96).max via unchecked statement | ||
/// @param proof The bridge proof | ||
/// @return delta Time delta since proof submitted | ||
function _timeSince(BridgeProof memory proof) internal view returns (uint256 delta) { | ||
unchecked { | ||
delta = uint96(block.timestamp) - proof.timestamp; | ||
} | ||
} | ||
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/// @inheritdoc IFastBridge | ||
function canClaim(bytes32 transactionId, address relayer) external view returns (bool) { | ||
if (bridgeStatuses[transactionId] != BridgeStatus.RELAYER_PROVED) revert StatusIncorrect(); | ||
BridgeProof memory proof = bridgeProofs[transactionId]; | ||
if (proof.relayer != relayer) revert SenderIncorrect(); | ||
return _timeSince(proof) > DISPUTE_PERIOD; | ||
} | ||
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/// @inheritdoc IFastBridgeV2 | ||
function claim(bytes memory request) external { | ||
claim(request, address(0)); | ||
} | ||
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/// @inheritdoc IFastBridge | ||
function claim(bytes memory request, address to) public { | ||
bytes32 transactionId = keccak256(request); | ||
BridgeTransaction memory transaction = getBridgeTransaction(request); | ||
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// update bridge tx status if able to claim origin collateral | ||
if (bridgeStatuses[transactionId] != BridgeStatus.RELAYER_PROVED) revert StatusIncorrect(); | ||
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BridgeProof memory proof = bridgeProofs[transactionId]; | ||
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// if "to" is zero addr, permissionlessly send funds to proven relayer | ||
if (to == address(0)) { | ||
to = proof.relayer; | ||
} else if (proof.relayer != msg.sender) { | ||
revert SenderIncorrect(); | ||
} | ||
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if (_timeSince(proof) <= DISPUTE_PERIOD) revert DisputePeriodNotPassed(); | ||
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bridgeStatuses[transactionId] = BridgeStatus.RELAYER_CLAIMED; | ||
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// update protocol fees if origin fee amount exists | ||
if (transaction.originFeeAmount > 0) protocolFees[transaction.originToken] += transaction.originFeeAmount; | ||
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// transfer origin collateral less fee to specified address | ||
address token = transaction.originToken; | ||
uint256 amount = transaction.originAmount; | ||
token.universalTransfer(to, amount); | ||
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emit BridgeDepositClaimed(transactionId, proof.relayer, to, token, amount); | ||
} | ||
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/// @inheritdoc IFastBridge | ||
function dispute(bytes32 transactionId) external onlyRole(GUARD_ROLE) { | ||
if (bridgeStatuses[transactionId] != BridgeStatus.RELAYER_PROVED) revert StatusIncorrect(); | ||
if (_timeSince(bridgeProofs[transactionId]) > DISPUTE_PERIOD) revert DisputePeriodPassed(); | ||
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// @dev relayer gets slashed effectively if dest relay has gone thru | ||
bridgeStatuses[transactionId] = BridgeStatus.REQUESTED; | ||
delete bridgeProofs[transactionId]; | ||
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emit BridgeProofDisputed(transactionId, msg.sender); | ||
} | ||
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/// @inheritdoc IFastBridge | ||
function refund(bytes memory request) external { | ||
bytes32 transactionId = keccak256(request); | ||
BridgeTransaction memory transaction = getBridgeTransaction(request); | ||
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if (hasRole(REFUNDER_ROLE, msg.sender)) { | ||
// Refunder can refund if deadline has passed | ||
if (block.timestamp <= transaction.deadline) revert DeadlineNotExceeded(); | ||
} else { | ||
// Permissionless refund is allowed after REFUND_DELAY | ||
if (block.timestamp <= transaction.deadline + REFUND_DELAY) revert DeadlineNotExceeded(); | ||
} | ||
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// set status to refunded if still in requested state | ||
if (bridgeStatuses[transactionId] != BridgeStatus.REQUESTED) revert StatusIncorrect(); | ||
bridgeStatuses[transactionId] = BridgeStatus.REFUNDED; | ||
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// transfer origin collateral back to original sender | ||
address to = transaction.originSender; | ||
address token = transaction.originToken; | ||
uint256 amount = transaction.originAmount + transaction.originFeeAmount; | ||
token.universalTransfer(to, amount); | ||
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emit BridgeDepositRefunded(transactionId, to, token, amount); | ||
} | ||
} |
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