@owlprotocol/contracts-account-abstraction/lib/esm/actions/paymaster/getPaymasterData.js

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

import { concatHex } from "viem";
import { getAction, encodeAbiParameters } from "viem/utils";
import { getChainId } from "viem/actions";
import { toPackedUserOperation } from "../../models/PackedUserOperation.js";
import { dummySignature, encodeUserOp } from "../../models/UserOperation.js";
import { getSupportedEntryPoints } from "../bundler/getSupportedEntryPoints.js";
import { getVerifyingPaymasterHash } from "../../VerifyingPaymaster.js";
async function getPaymasterData(client, parameters) {
  const { entryPointAddress, ...userOperation } = parameters;
  const { paymaster } = client;
  const chainId = client.chain?.id ?? await getAction(client, getChainId, "getChainId")({});
  const supportedEntryPoints = await getAction(
    client,
    getSupportedEntryPoints,
    "getSupportedEntryPoints"
  )({});
  if (!supportedEntryPoints.includes(entryPointAddress)) {
    throw new Error(`Unsupported entrypoint ${entryPointAddress}, expected one of ${supportedEntryPoints}`);
  }
  const validUntil = Date.now() + 3600;
  const validAfter = 0;
  const paymasterDataUnsigned = encodeAbiParameters(
    [
      { name: "validUntil", type: "uint48" },
      { name: "validAfter", type: "uint48" }
    ],
    [validUntil, validAfter]
  );
  const userOpPaymasterPacked = toPackedUserOperation(
    encodeUserOp({
      ...userOperation,
      preVerificationGas: userOperation.preVerificationGas ?? 0n,
      verificationGasLimit: userOperation.verificationGasLimit ?? 0n,
      callGasLimit: userOperation.callGasLimit ?? 0n,
      maxFeePerGas: userOperation.maxFeePerGas ?? 0n,
      maxPriorityFeePerGas: userOperation.maxPriorityFeePerGas ?? 0n,
      signature: dummySignature,
      paymaster,
      paymasterData: concatHex([paymasterDataUnsigned, dummySignature])
    })
  );
  const userOpPaymasterHash = getVerifyingPaymasterHash({ chainId, userOperation: userOpPaymasterPacked });
  const paymasterSignature = await client.account.signMessage({
    message: {
      raw: userOpPaymasterHash
    }
  });
  const paymasterDataSigned = concatHex([paymasterDataUnsigned, paymasterSignature]);
  return {
    paymaster,
    paymasterData: paymasterDataSigned,
    paymasterVerificationGasLimit: 100000n,
    paymasterPostOpGasLimit: 100000n
  };
}
export {
  getPaymasterData
};