@owlprotocol/contracts-account-abstraction/lib/esm/VerifyingPaymaster.js

ERC4337 Account Abstraction support for deploying relevant smart contracts and interacting with UserOps.

import { decodeAbiParameters, encodeAbiParameters, keccak256, sliceHex } from "viem";
function getVerifyingPaymasterHash(params) {
  const { chainId, userOperation } = params;
  const abi = [
    { type: "address", name: "sender" },
    { type: "uint256", name: "nonce" },
    { type: "bytes32", name: "initCodeHash" },
    { type: "bytes32", name: "callDataHash" },
    { type: "bytes32", name: "accountGasLimits" },
    { type: "uint256", name: "paymasterAndData" },
    { type: "uint256", name: "preVerificationGas" },
    { type: "bytes32", name: "gasFees" },
    { type: "uint256", name: "chainId" },
    { type: "address", name: "paymaster" },
    { type: "uint48", name: "validUntil" },
    { type: "uint48", name: "validAfter" }
  ];
  const [validUntil, validAfter] = decodeAbiParameters(
    [
      { name: "validUntil", type: "uint48" },
      { name: "validAfter", type: "uint48" }
    ],
    sliceHex(userOperation.paymasterAndData, 52)
  );
  return keccak256(
    encodeAbiParameters(abi, [
      userOperation.sender,
      userOperation.nonce,
      keccak256(userOperation.initCode),
      keccak256(userOperation.callData),
      userOperation.accountGasLimits,
      sliceHex(userOperation.paymasterAndData, 20, 52),
      //paymaster gas
      userOperation.preVerificationGas,
      userOperation.gasFees,
      chainId,
      sliceHex(userOperation.paymasterAndData, 0, 20),
      // paymaster address
      validUntil,
      validAfter
    ])
  );
}
export {
  getVerifyingPaymasterHash
};