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encodeAbiParameters,
parseAbiParameters,
encodePacked,
keccak256,
toHex,
} from 'viem';
import type {
Address,
Delegation,
Execution,
Hex,
UserOperation,
} from '../types.ts';
/**
* ERC-4337 EntryPoint v0.7 address (deployed at deterministic address).
*/
export const ENTRY_POINT_V07: Address =
'0x0000000071727de22e5e9d8baf0edac6f37da032';
/**
* Default gas limits for UserOperations.
* These are conservative defaults; use `estimateUserOpGas` for accurate values.
*/
const DEFAULT_GAS_LIMITS = {
callGasLimit: '0x50000' as Hex,
verificationGasLimit: '0x60000' as Hex,
preVerificationGas: '0x10000' as Hex,
} as const;
/**
* ABI tuple type for a single Delegation struct.
*/
const DELEGATION_TUPLE =
'(address delegate, address delegator, bytes32 authority, (address enforcer, bytes terms)[] caveats, uint256 salt, bytes signature)';
/**
* Encode a delegation chain into the permission context bytes
* expected by `DelegationManager.redeemDelegations`.
*
* @param delegations - The delegation chain (leaf to root order).
* @returns The ABI-encoded permission context.
*/
export function encodeDelegationChain(delegations: Delegation[]): Hex {
const tuples = delegations.map((del) => ({
delegate: del.delegate,
delegator: del.delegator,
authority: del.authority,
caveats: del.caveats.map((cav) => ({
enforcer: cav.enforcer,
terms: cav.terms,
})),
salt: BigInt(del.salt),
signature: del.signature ?? '0x',
}));
return encodeAbiParameters(parseAbiParameters(`${DELEGATION_TUPLE}[]`), [
tuples,
] as never);
}
/**
* Encode an Execution struct for use in callData.
*
* @param execution - The execution to encode.
* @returns The ABI-encoded execution.
*/
export function encodeExecution(execution: Execution): Hex {
return encodeAbiParameters(
parseAbiParameters('address target, uint256 value, bytes callData'),
[execution.target, BigInt(execution.value), execution.callData],
);
}
/**
* Function selector for `redeemDelegations(bytes[],uint256[],bytes[])`.
*/
const REDEEM_DELEGATIONS_SELECTOR = '0x38c86720' as Hex;
/**
* Build the callData for `DelegationManager.redeemDelegations`.
*
* @param options - Options.
* @param options.delegations - The delegation chain (leaf to root).
* @param options.execution - The execution to perform.
* @returns The encoded callData.
*/
export function buildRedeemCallData(options: {
delegations: Delegation[];
execution: Execution;
}): Hex {
const permissionContexts = [encodeDelegationChain(options.delegations)];
const modes = [0n]; // SingleDefault
const executions = [
encodeAbiParameters(
parseAbiParameters('(address target, uint256 value, bytes callData)[]'),
[
[
{
target: options.execution.target,
value: BigInt(options.execution.value),
callData: options.execution.callData,
},
],
] as never,
),
];
const args = encodeAbiParameters(
parseAbiParameters('bytes[], uint256[], bytes[]'),
[permissionContexts, modes, executions],
);
return (REDEEM_DELEGATIONS_SELECTOR + args.slice(2)) as Hex;
}
/**
* Build an unsigned UserOperation for delegation redemption.
*
* @param options - Options.
* @param options.sender - The smart account address.
* @param options.nonce - The account nonce.
* @param options.delegations - The delegation chain.
* @param options.execution - The execution to perform.
* @param options.maxFeePerGas - Max fee per gas.
* @param options.maxPriorityFeePerGas - Max priority fee per gas.
* @param options.gasLimits - Optional gas limit overrides.
* @param options.gasLimits.callGasLimit - Override for call gas limit.
* @param options.gasLimits.verificationGasLimit - Override for verification gas limit.
* @param options.gasLimits.preVerificationGas - Override for pre-verification gas.
* @param options.factory - Optional factory address for account deployment.
* @param options.factoryData - Optional factory data for account deployment.
* @returns An unsigned UserOperation.
*/
export function buildDelegationUserOp(options: {
sender: Address;
nonce: Hex;
delegations: Delegation[];
execution: Execution;
maxFeePerGas: Hex;
maxPriorityFeePerGas: Hex;
factory?: Address;
factoryData?: Hex;
gasLimits?: {
callGasLimit?: Hex;
verificationGasLimit?: Hex;
preVerificationGas?: Hex;
};
}): UserOperation {
const callData = buildRedeemCallData({
delegations: options.delegations,
execution: options.execution,
});
return {
sender: options.sender,
nonce: options.nonce,
...(options.factory ? { factory: options.factory } : {}),
...(options.factoryData ? { factoryData: options.factoryData } : {}),
callData,
callGasLimit:
options.gasLimits?.callGasLimit ?? DEFAULT_GAS_LIMITS.callGasLimit,
verificationGasLimit:
options.gasLimits?.verificationGasLimit ??
DEFAULT_GAS_LIMITS.verificationGasLimit,
preVerificationGas:
options.gasLimits?.preVerificationGas ??
DEFAULT_GAS_LIMITS.preVerificationGas,
maxFeePerGas: options.maxFeePerGas,
maxPriorityFeePerGas: options.maxPriorityFeePerGas,
signature: '0x' as Hex,
};
}
/**
* Compute the hash of a UserOperation for signing (ERC-4337 v0.7).
*
* @param userOp - The UserOperation.
* @param entryPoint - The EntryPoint address.
* @param chainId - The chain ID.
* @returns The hash to sign.
*/
export function computeUserOpHash(
userOp: UserOperation,
entryPoint: Address,
chainId: number,
): Hex {
// ERC-4337 v0.7 uses abi.encode for the inner hash (8 fields) and the
// outer hash. Sub-fields accountGasLimits and gasFees are packed via
// encodePacked(uint128, uint128) into bytes32.
// The inner fields match PackedUserOperation:
// abi.encode(sender, nonce, hashInitCode, hashCallData,
// accountGasLimits, preVerificationGas, gasFees,
// hashPaymasterAndData)
// where accountGasLimits = encodePacked(verificationGasLimit, callGasLimit)
// and gasFees = encodePacked(maxPriorityFeePerGas, maxFeePerGas).
const packed = keccak256(
encodeAbiParameters(
parseAbiParameters(
'address, uint256, bytes32, bytes32, bytes32, uint256, bytes32, bytes32',
),
[
userOp.sender,
BigInt(userOp.nonce),
keccak256(
userOp.factory && userOp.factoryData
? encodePacked(
['address', 'bytes'],
[userOp.factory, userOp.factoryData],
)
: '0x',
),
keccak256(userOp.callData),
encodePacked(
['uint128', 'uint128'],
[BigInt(userOp.verificationGasLimit), BigInt(userOp.callGasLimit)],
),
BigInt(userOp.preVerificationGas),
encodePacked(
['uint128', 'uint128'],
[BigInt(userOp.maxPriorityFeePerGas), BigInt(userOp.maxFeePerGas)],
),
keccak256(
userOp.paymaster
? encodePacked(
['address', 'uint128', 'uint128', 'bytes'],
[
userOp.paymaster,
BigInt(userOp.paymasterVerificationGasLimit ?? '0x0'),
BigInt(userOp.paymasterPostOpGasLimit ?? '0x0'),
userOp.paymasterData ?? '0x',
],
)
: '0x',
),
],
),
);
return keccak256(
encodeAbiParameters(parseAbiParameters('bytes32, address, uint256'), [
packed,
entryPoint,
BigInt(chainId),
]),
);
}
/**
* Convert a number to a hex string.
*
* @param value - The number to convert.
* @returns The hex string.
*/
export function numberToHex(value: number | bigint): Hex {
return toHex(value);
}
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