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array,
boolean,
create,
define,
enums,
literal,
number,
object,
optional,
record,
string,
union,
unknown,
} from '@metamask/superstruct';
import type { Infer } from '@metamask/superstruct';
// ---------------------------------------------------------------------------
// Hex string helpers
// ---------------------------------------------------------------------------
/**
* A 0x-prefixed hex string.
*/
export type Hex = `0x${string}`;
const HexStruct = define<Hex>('Hex', (value) => {
return typeof value === 'string' && /^0x[\da-f]*$/iu.test(value);
});
/**
* A 0x-prefixed Ethereum address (20 bytes).
*/
export type Address = Hex;
const AddressStruct = define<Address>('Address', (value) => {
return typeof value === 'string' && /^0x[\da-f]{40}$/iu.test(value);
});
// ---------------------------------------------------------------------------
// Chain configuration
// ---------------------------------------------------------------------------
export const ChainConfigStruct = object({
chainId: number(),
rpcUrl: string(),
name: optional(string()),
});
export type ChainConfig = Infer<typeof ChainConfigStruct>;
/**
* Create a validated ChainConfig.
*
* @param options - Chain configuration options.
* @param options.chainId - The numeric chain ID.
* @param options.rpcUrl - The JSON-RPC endpoint URL.
* @param options.name - Optional human-readable chain name.
* @returns A validated ChainConfig object.
*/
export function makeChainConfig(options: {
chainId: number;
rpcUrl: string;
name?: string;
}): ChainConfig {
return create(options, ChainConfigStruct);
}
// ---------------------------------------------------------------------------
// Caveat types (MetaMask Delegation Framework / Gator)
// ---------------------------------------------------------------------------
/**
* Supported caveat enforcer types.
* Each maps to a deployed enforcer contract on the delegation framework.
*/
export const CaveatTypeValues = [
'allowedTargets',
'allowedMethods',
'valueLte',
'nativeTokenTransferAmount',
'erc20TransferAmount',
'limitedCalls',
'timestamp',
] as const;
export type CaveatType = (typeof CaveatTypeValues)[number];
const CaveatTypeStruct = enums(CaveatTypeValues);
export const CaveatStruct = object({
enforcer: AddressStruct,
terms: HexStruct,
args: optional(HexStruct),
type: CaveatTypeStruct,
});
export type Caveat = Infer<typeof CaveatStruct>;
// ---------------------------------------------------------------------------
// Delegation
// ---------------------------------------------------------------------------
export const DelegationStatusValues = ['pending', 'signed', 'revoked'] as const;
export type DelegationStatus = (typeof DelegationStatusValues)[number];
export const DelegationStruct = object({
id: string(),
delegator: AddressStruct,
delegate: AddressStruct,
authority: HexStruct,
caveats: array(CaveatStruct),
salt: HexStruct,
signature: optional(HexStruct),
chainId: number(),
status: enums(DelegationStatusValues),
});
export type Delegation = Infer<typeof DelegationStruct>;
// ---------------------------------------------------------------------------
// Transaction types
// ---------------------------------------------------------------------------
export const TransactionRequestStruct = object({
from: AddressStruct,
to: AddressStruct,
value: optional(HexStruct),
data: optional(HexStruct),
nonce: optional(number()),
gasLimit: optional(HexStruct),
gasPrice: optional(HexStruct),
maxFeePerGas: optional(HexStruct),
maxPriorityFeePerGas: optional(HexStruct),
chainId: optional(number()),
});
export type TransactionRequest = Infer<typeof TransactionRequestStruct> & {
/**
* EIP-7702 signed authorization list. When present, the transaction is
* serialized as a type-4 (EIP-7702) transaction instead of EIP-1559.
* Not struct-validated; only flows internally.
*/
authorizationList?: readonly {
contractAddress: Address;
chainId: number;
nonce: number;
r?: Hex;
s?: Hex;
yParity?: number;
}[];
};
// ---------------------------------------------------------------------------
// Signing request (used for peer wallet communication)
// ---------------------------------------------------------------------------
export const SigningRequestStruct = union([
object({
type: literal('transaction'),
tx: TransactionRequestStruct,
}),
object({
type: literal('typedData'),
data: record(string(), unknown()),
}),
object({
type: literal('message'),
message: string(),
account: AddressStruct,
}),
]);
export type SigningRequest = Infer<typeof SigningRequestStruct>;
// ---------------------------------------------------------------------------
// Wallet capabilities introspection
// ---------------------------------------------------------------------------
export const DelegationInfoStruct = object({
id: string(),
delegator: AddressStruct,
delegate: AddressStruct,
caveats: array(
object({
type: CaveatTypeStruct,
humanReadable: string(),
}),
),
});
export type DelegationInfo = Infer<typeof DelegationInfoStruct>;
export const WalletCapabilitiesStruct = object({
hasLocalKeys: boolean(),
localAccounts: array(AddressStruct),
delegationCount: number(),
delegations: optional(array(DelegationInfoStruct)),
hasPeerWallet: boolean(),
hasExternalSigner: boolean(),
hasBundlerConfig: boolean(),
smartAccountAddress: optional(AddressStruct),
chainId: optional(number()),
signingMode: optional(string()),
autonomy: optional(string()),
peerAccountsCached: optional(boolean()),
cachedPeerAccounts: optional(array(AddressStruct)),
hasAwayWallet: optional(boolean()),
});
export type WalletCapabilities = Infer<typeof WalletCapabilitiesStruct>;
// ---------------------------------------------------------------------------
// Smart account configuration
// ---------------------------------------------------------------------------
export const SmartAccountConfigStruct = object({
implementation: union([literal('hybrid'), literal('stateless7702')]),
deploySalt: optional(HexStruct),
address: optional(AddressStruct),
factory: optional(AddressStruct),
factoryData: optional(HexStruct),
deployed: optional(boolean()),
});
export type SmartAccountConfig = Infer<typeof SmartAccountConfigStruct>;
// ---------------------------------------------------------------------------
// Action descriptor (for delegation matching)
// ---------------------------------------------------------------------------
export const ActionStruct = object({
to: AddressStruct,
value: optional(HexStruct),
data: optional(HexStruct),
});
export type Action = Infer<typeof ActionStruct>;
// ---------------------------------------------------------------------------
// Delegation creation options
// ---------------------------------------------------------------------------
export const CreateDelegationOptionsStruct = object({
delegate: AddressStruct,
caveats: array(CaveatStruct),
chainId: number(),
salt: optional(HexStruct),
});
export type CreateDelegationOptions = Infer<
typeof CreateDelegationOptionsStruct
>;
// ---------------------------------------------------------------------------
// EIP-712 typed data (generic representation)
// ---------------------------------------------------------------------------
export const Eip712DomainStruct = object({
name: optional(string()),
version: optional(string()),
chainId: optional(number()),
verifyingContract: optional(AddressStruct),
salt: optional(HexStruct),
});
export type Eip712Domain = Infer<typeof Eip712DomainStruct>;
export const Eip712TypedDataStruct = object({
domain: Eip712DomainStruct,
types: record(string(), array(object({ name: string(), type: string() }))),
primaryType: string(),
message: record(string(), unknown()),
});
export type Eip712TypedData = Infer<typeof Eip712TypedDataStruct>;
// ---------------------------------------------------------------------------
// ERC-4337 UserOperation (off-chain representation, v0.7)
// ---------------------------------------------------------------------------
export const UserOperationStruct = object({
sender: AddressStruct,
nonce: HexStruct,
factory: optional(AddressStruct),
factoryData: optional(HexStruct),
callData: HexStruct,
callGasLimit: HexStruct,
verificationGasLimit: HexStruct,
preVerificationGas: HexStruct,
maxFeePerGas: HexStruct,
maxPriorityFeePerGas: HexStruct,
paymaster: optional(AddressStruct),
paymasterVerificationGasLimit: optional(HexStruct),
paymasterPostOpGasLimit: optional(HexStruct),
paymasterData: optional(HexStruct),
signature: HexStruct,
});
export type UserOperation = Infer<typeof UserOperationStruct>;
// ---------------------------------------------------------------------------
// Execution descriptor (for delegation redemption)
// ---------------------------------------------------------------------------
export const ExecutionStruct = object({
target: AddressStruct,
value: HexStruct,
callData: HexStruct,
});
export type Execution = Infer<typeof ExecutionStruct>;
// ---------------------------------------------------------------------------
// Delegation match result (for delegation matching diagnostics)
// ---------------------------------------------------------------------------
export type DelegationMatchResult = {
matches: boolean;
failedCaveat?: CaveatType;
reason?: string;
};
// ---------------------------------------------------------------------------
// Swap types (MetaSwap API)
// ---------------------------------------------------------------------------
export const SwapQuoteStruct = object({
trade: object({
to: string(),
from: string(),
data: string(),
value: string(),
gas: string(),
}),
approvalNeeded: union([
object({ to: string(), data: string(), value: string() }),
literal(null),
]),
sourceAmount: string(),
destinationAmount: string(),
aggregator: string(),
fee: number(),
gasEstimate: string(),
priceSlippage: number(),
quoteRefreshSeconds: number(),
});
export type SwapQuote = Infer<typeof SwapQuoteStruct>;
export type SwapResult = {
approvalTxHash?: Hex | undefined;
swapTxHash: Hex;
sourceAmount: string;
destinationAmount: string;
aggregator: string;
batched?: boolean | undefined;
};
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