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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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@@ -10,6 +10,16 @@ import { BasePaymaster } from "../base/BasePaymaster.sol"; | |
| import { BiconomyTokenPaymasterErrors } from "../common/BiconomyTokenPaymasterErrors.sol"; | ||
| import { IBiconomyTokenPaymaster } from "../interfaces/IBiconomyTokenPaymaster.sol"; | ||
|
|
||
| /** | ||
| * @title BiconomyTokenPaymaster | ||
| * @author ShivaanshK<[email protected]> | ||
| * @author livingrockrises<[email protected]> | ||
| * @notice Token Paymaster for v0.7 Entry Point | ||
| * @dev A paymaster that allows user to pay gas fee in ERC20 tokens. The paymaster owner chooses which tokens to | ||
| * accept. The payment manager (usually the owner) first deposits native gas into the EntryPoint. Then, for each | ||
| * transaction, it takes the gas fee from the user's ERC20 token balance. The exchange rate between ETH and the token is | ||
| * calculated using 1 of three methods: external price source, off-chain oracle, or a TWAP oracle. | ||
| */ | ||
| contract BiconomyTokenPaymaster is | ||
| BasePaymaster, | ||
| ReentrancyGuard, | ||
|
|
@@ -19,12 +29,86 @@ contract BiconomyTokenPaymaster is | |
| using UserOperationLib for PackedUserOperation; | ||
| using SignatureCheckerLib for address; | ||
|
|
||
| address public verifyingSigner; | ||
| address public feeCollector; | ||
| uint16 public unaccountedGas; | ||
|
|
||
| // Limit for unaccounted gas cost | ||
| uint16 private constant UNACCOUNTED_GAS_LIMIT = 50_000; | ||
|
|
||
| constructor( | ||
| address _owner, | ||
| IEntryPoint _entryPoint | ||
| IEntryPoint _entryPoint, | ||
| address _verifyingSigner, | ||
| address _feeCollector, | ||
| uint16 _unaccountedGas | ||
| ) | ||
| BasePaymaster(_owner, _entryPoint) | ||
| { } | ||
| { | ||
| _checkConstructorArgs(_verifyingSigner, _feeCollector, _unaccountedGas); | ||
| assembly ("memory-safe") { | ||
| sstore(verifyingSigner.slot, _verifyingSigner) | ||
| } | ||
| verifyingSigner = _verifyingSigner; | ||
| feeCollector = _feeCollector; | ||
| unaccountedGas = _unaccountedGas; | ||
| } | ||
|
|
||
| /** | ||
| * @dev Set a new verifying signer address. | ||
| * Can only be called by the owner of the contract. | ||
| * @param _newVerifyingSigner The new address to be set as the verifying signer. | ||
| * @notice If _newVerifyingSigner is set to zero address, it will revert with an error. | ||
| * After setting the new signer address, it will emit an event VerifyingSignerChanged. | ||
| */ | ||
| function setSigner(address _newVerifyingSigner) external payable override onlyOwner { | ||
| if (_isContract(_newVerifyingSigner)) revert VerifyingSignerCanNotBeContract(); | ||
| if (_newVerifyingSigner == address(0)) { | ||
| revert VerifyingSignerCanNotBeZero(); | ||
| } | ||
| address oldSigner = verifyingSigner; | ||
| assembly ("memory-safe") { | ||
| sstore(verifyingSigner.slot, _newVerifyingSigner) | ||
| } | ||
| emit VerifyingSignerChanged(oldSigner, _newVerifyingSigner, msg.sender); | ||
| } | ||
|
|
||
| /** | ||
| * @dev Set a new fee collector address. | ||
| * Can only be called by the owner of the contract. | ||
| * @param _newFeeCollector The new address to be set as the fee collector. | ||
| * @notice If _newFeeCollector is set to zero address, it will revert with an error. | ||
| * After setting the new fee collector address, it will emit an event FeeCollectorChanged. | ||
| */ | ||
| function setFeeCollector(address _newFeeCollector) external payable override onlyOwner { | ||
| if (_isContract(_newFeeCollector)) revert FeeCollectorCanNotBeContract(); | ||
| if (_newFeeCollector == address(0)) revert FeeCollectorCanNotBeZero(); | ||
| address oldFeeCollector = feeCollector; | ||
| feeCollector = _newFeeCollector; | ||
| emit FeeCollectorChanged(oldFeeCollector, _newFeeCollector, msg.sender); | ||
| } | ||
|
|
||
| /** | ||
| * @dev Set a new unaccountedEPGasOverhead value. | ||
| * @param value The new value to be set as the unaccountedEPGasOverhead. | ||
| * @notice only to be called by the owner of the contract. | ||
| */ | ||
| function setUnaccountedGas(uint16 value) external payable override onlyOwner { | ||
| if (value > UNACCOUNTED_GAS_LIMIT) { | ||
| revert UnaccountedGasTooHigh(); | ||
| } | ||
| uint16 oldValue = unaccountedGas; | ||
| unaccountedGas = value; | ||
| emit UnaccountedGasChanged(oldValue, value); | ||
| } | ||
|
|
||
| /** | ||
| * Add a deposit in native currency for this paymaster, used for paying for transaction fees. | ||
| * This is ideally done by the entity who is managing the received ERC20 gas tokens. | ||
| */ | ||
| function deposit() public payable virtual override nonReentrant { | ||
| entryPoint.depositTo{ value: msg.value }(address(this)); | ||
| } | ||
|
|
||
| /** | ||
| * @dev Validate a user operation. | ||
|
|
@@ -64,4 +148,25 @@ contract BiconomyTokenPaymaster is | |
| { | ||
| // Implementation of post-operation logic | ||
| } | ||
|
|
||
| function _checkConstructorArgs( | ||
| address _verifyingSigner, | ||
| address _feeCollector, | ||
| uint16 _unaccountedGas | ||
| ) | ||
| internal | ||
| view | ||
| { | ||
| if (_verifyingSigner == address(0)) { | ||
| revert VerifyingSignerCanNotBeZero(); | ||
| } else if (_isContract(_verifyingSigner)) { | ||
| revert VerifyingSignerCanNotBeContract(); | ||
| } else if (_feeCollector == address(0)) { | ||
| revert FeeCollectorCanNotBeZero(); | ||
| } else if (_isContract(_feeCollector)) { | ||
| revert FeeCollectorCanNotBeContract(); | ||
| } else if (_unaccountedGas > UNACCOUNTED_GAS_LIMIT) { | ||
| revert UnaccountedGasTooHigh(); | ||
| } | ||
| } | ||
| } | ||
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