55 lines
1.8 KiB
Solidity
55 lines
1.8 KiB
Solidity
// SPDX-License-Identifier: MIT
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pragma solidity ^0.8.24;
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import {AbstractSigner} from "./AbstractSigner.sol";
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import {SignatureChecker} from "../SignatureChecker.sol";
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/**
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* @dev Implementation of {AbstractSigner} using
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* https://eips.ethereum.org/EIPS/eip-7913[ERC-7913] signature verification.
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*
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* For {Account} usage, a {_setSigner} function is provided to set the ERC-7913 formatted {signer}.
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* Doing so is easier for a factory, who is likely to use initializable clones of this contract.
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*
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* The signer is a `bytes` object that concatenates a verifier address and a key: `verifier || key`.
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*
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* Example of usage:
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*
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* ```solidity
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* contract MyAccountERC7913 is Account, SignerERC7913, Initializable {
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* function initialize(bytes memory signer_) public initializer {
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* _setSigner(signer_);
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* }
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* }
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* ```
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*
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* IMPORTANT: Failing to call {_setSigner} either during construction (if used standalone)
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* or during initialization (if used as a clone) may leave the signer either front-runnable or unusable.
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*/
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abstract contract SignerERC7913 is AbstractSigner {
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bytes private _signer;
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/// @dev Return the ERC-7913 signer (i.e. `verifier || key`).
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function signer() public view virtual returns (bytes memory) {
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return _signer;
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}
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/// @dev Sets the signer (i.e. `verifier || key`) with an ERC-7913 formatted signer.
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function _setSigner(bytes memory signer_) internal {
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_signer = signer_;
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}
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/**
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* @dev Verifies a signature using {SignatureChecker-isValidSignatureNow-bytes-bytes32-bytes-}
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* with {signer}, `hash` and `signature`.
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*/
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function _rawSignatureValidation(
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bytes32 hash,
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bytes calldata signature
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) internal view virtual override returns (bool) {
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return SignatureChecker.isValidSignatureNow(signer(), hash, signature);
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}
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}
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