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import type { Logger } from '@metamask/logger';
import type { Baggage } from '@metamask/ocap-kernel';
import type { SignedAuthorization } from 'viem';
import { makeKeyring } from '../lib/keyring.ts';
import type {
EncryptedKeyringInit,
Keyring,
KeyringInitOptions,
StoredKeyringInit,
} from '../lib/keyring.ts';
import { encryptMnemonic, decryptMnemonic } from '../lib/mnemonic-crypto.ts';
import {
signAuthorization,
signHash,
signTransaction,
signMessage,
signTypedData,
} from '../lib/signing.ts';
import type {
Address,
Eip712TypedData,
Hex,
TransactionRequest,
} from '../types.ts';
/**
* Vat powers for the keyring vat.
*/
type VatPowers = {
logger?: Logger;
};
/**
* Build the root object for the keyring vat.
*
* The keyring vat isolates private keys. Keys never leave this vat.
* Other vats send unsigned payloads and receive signed bytes.
*
* @param _vatPowers - Special powers granted to this vat.
* @param _parameters - Initialization parameters.
* @param baggage - Root of vat's persistent state.
* @returns The root object for the keyring vat.
*/
export function buildRootObject(
_vatPowers: VatPowers,
_parameters: unknown,
baggage: Baggage,
): object {
let keyring: Keyring | undefined;
let locked = false;
/**
* Check if stored data is encrypted.
*
* @param data - The stored keyring init data.
* @returns True if the data is encrypted.
*/
function isEncrypted(data: StoredKeyringInit): data is EncryptedKeyringInit {
return 'encrypted' in data && data.encrypted;
}
/**
* Rebuild the keyring from plaintext init options and re-derive accounts.
*
* @param initOptions - The plaintext keyring init options.
*/
function rebuildKeyring(initOptions: KeyringInitOptions): void {
keyring = makeKeyring(initOptions);
if (baggage.has('accountCount')) {
const count = baggage.get('accountCount') as number;
for (let i = 1; i < count; i++) {
keyring.deriveAccount(i);
}
}
}
/**
* Throw if the keyring is locked.
*/
function assertUnlocked(): void {
if (locked) {
throw new Error('Keyring is locked');
}
}
// Restore keyring from baggage if previously initialized
if (baggage.has('keyringInit')) {
const stored = baggage.get('keyringInit') as StoredKeyringInit;
if (isEncrypted(stored)) {
// Encrypted — keyring stays undefined until unlock() is called
locked = true;
} else {
rebuildKeyring(stored);
}
}
return makeDefaultExo('walletKeyring', {
async bootstrap(): Promise<void> {
// No services needed for the keyring vat
},
async initialize(
options: KeyringInitOptions,
password?: string,
salt?: string,
pbkdf2Iterations?: number,
): Promise<void> {
if (keyring || locked) {
throw new Error('Keyring already initialized');
}
keyring = makeKeyring(options);
// Determine what to persist: encrypted if password provided for SRP
let stored: StoredKeyringInit;
if (password && options.type === 'srp') {
if (!salt) {
throw new Error(
'A random salt is required when encrypting the mnemonic',
);
}
stored = {
...encryptMnemonic({
mnemonic: options.mnemonic,
password,
salt,
pbkdf2Iterations,
}),
type: 'srp',
};
} else {
stored = options;
}
Iif (baggage.has('keyringInit')) {
baggage.set('keyringInit', stored);
} else {
baggage.init('keyringInit', stored);
}
},
async unlock(password: string, pbkdf2Iterations?: number): Promise<void> {
if (!locked) {
throw new Error('Keyring is not locked');
}
Iif (!baggage.has('keyringInit')) {
throw new Error('No keyring data in baggage');
}
const stored = baggage.get('keyringInit') as EncryptedKeyringInit;
const mnemonic = decryptMnemonic({
data: stored,
password,
pbkdf2Iterations,
});
rebuildKeyring({ type: 'srp', mnemonic });
locked = false;
},
async isLocked(): Promise<boolean> {
return locked;
},
async hasKeys(): Promise<boolean> {
return keyring?.hasKeys() ?? false;
},
async deriveAccount(index: number): Promise<Address> {
assertUnlocked();
if (!keyring) {
throw new Error('Keyring not initialized');
}
const address = keyring.deriveAccount(index);
// Persist the derived account count
const accounts = keyring.getAccounts();
if (baggage.has('accountCount')) {
baggage.set('accountCount', accounts.length);
} else {
baggage.init('accountCount', accounts.length);
}
return address;
},
async getAccounts(): Promise<Address[]> {
if (!keyring) {
return [];
}
return keyring.getAccounts();
},
async signTransaction(tx: TransactionRequest): Promise<Hex> {
assertUnlocked();
Iif (!keyring) {
throw new Error('Keyring not initialized');
}
const account = keyring.getAccount(tx.from);
if (!account) {
throw new Error(`No key for account ${tx.from}`);
}
return signTransaction({ account, tx });
},
async signTypedData(
typedData: Eip712TypedData,
from?: Address,
): Promise<Hex> {
assertUnlocked();
Iif (!keyring) {
throw new Error('Keyring not initialized');
}
const accounts = keyring.getAccounts();
const address = from ?? accounts[0];
Iif (!address) {
throw new Error('No accounts available');
}
const account = keyring.getAccount(address);
if (!account) {
throw new Error(`No key for account ${address}`);
}
return signTypedData({ account, typedData });
},
async signHash(hash: Hex, from?: Address): Promise<Hex> {
assertUnlocked();
if (!keyring) {
throw new Error('Keyring not initialized');
}
const accounts = keyring.getAccounts();
const address = from ?? accounts[0];
Iif (!address) {
throw new Error('No accounts available');
}
const account = keyring.getAccount(address);
Iif (!account) {
throw new Error(`No key for account ${address}`);
}
return signHash({ account, hash });
},
async signMessage(message: string, from?: Address): Promise<Hex> {
assertUnlocked();
Iif (!keyring) {
throw new Error('Keyring not initialized');
}
const accounts = keyring.getAccounts();
const address = from ?? accounts[0];
Iif (!address) {
throw new Error('No accounts available');
}
const account = keyring.getAccount(address);
Iif (!account) {
throw new Error(`No key for account ${address}`);
}
return signMessage({ account, message });
},
async signAuthorization(options: {
contractAddress: Address;
chainId: number;
nonce?: number;
from?: Address;
}): Promise<SignedAuthorization> {
assertUnlocked();
if (!keyring) {
throw new Error('Keyring not initialized');
}
const accounts = keyring.getAccounts();
const address = options.from ?? accounts[0];
Iif (!address) {
throw new Error('No accounts available');
}
const account = keyring.getAccount(address);
Iif (!account) {
throw new Error(`No key for account ${address}`);
}
return signAuthorization({
account,
contractAddress: options.contractAddress,
chainId: options.chainId,
nonce: options.nonce,
});
},
});
}
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