36 lines
1.0 KiB
Solidity
36 lines
1.0 KiB
Solidity
// SPDX-License-Identifier: MIT
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pragma solidity 0.8.10;
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import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";
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import "@openzeppelin/contracts/access/Ownable.sol";
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contract HasSignature is Ownable {
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mapping(bytes => bool) private _usedSignatures;
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function checkSigner(
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address signer,
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bytes32 hash,
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bytes memory signature
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) public pure {
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require(signer != address(0), "[BE] invalid signer");
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require(signature.length == 65, "[BE] invalid signature length");
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bytes32 ethSignedMessageHash = ECDSA.toEthSignedMessageHash(hash);
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address recovered = ECDSA.recover(ethSignedMessageHash, signature);
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require(recovered == signer, "[BE] invalid signature");
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}
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modifier signatureValid(bytes calldata signature) {
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require(
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!_usedSignatures[signature],
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"[BE] signature used. please send another transaction with new signature"
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);
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_;
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}
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function _useSignature(bytes calldata signature) internal {
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if (!_usedSignatures[signature]) {
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_usedSignatures[signature] = true;
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}
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}
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}
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