File: StRSRVotes.sol
166:     function delegateBySig(
167:         address delegatee,
168:         uint256 nonce,
169:         uint256 expiry,
170:         uint8 v,
171:         bytes32 r,
172:         bytes32 s
173:     ) public {
174:         require(block.timestamp <= expiry, "signature expired");
175:         address signer = ECDSAUpgradeable.recover(
176:             _hashTypedDataV4(keccak256(abi.encode(_DELEGATE_TYPEHASH, delegatee, nonce, expiry))),
177:             v,
178:             r,
179:             s
180:         );
181:         require(nonce == _useDelegationNonce(signer), "invalid nonce");
182:         _delegate(signer, delegatee);
183:     }
