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9x 1x 8x 1x 7x 4x 4x 6x 6x 3x 4x 2x 5x 5x 5x 5x 7x 7x 7x 3x 2x 2x 1x 1x 5x 5x 4x 5x 17x 1x 16x 16x 16x 16x 20x 12x 12x 11x 11x 11x 8x 8x 1x 1x 14x 14x 14x 14x 14x 14x 14x 14x 14x 14x 14x 14x 14x 10x 10x 14x 6x 6x 14x 14x 14x 14x 14x 1x 9x 9x 2x 7x 7x 7x 7x 7x 7x 7x | /*
* This file is part of midnight-js.
* Copyright (C) 2025-2026 Midnight Foundation
* SPDX-License-Identifier: Apache-2.0
* Licensed under the Apache License, Version 2.0 (the "License");
* You may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import type { ContractAddress, SigningKey } from '@midnight-ntwrk/compact-runtime';
import {
ExportDecryptionError,
type ExportPrivateStatesOptions,
type ExportSigningKeysOptions,
ImportConflictError,
type ImportPrivateStatesOptions,
type ImportPrivateStatesResult,
type ImportSigningKeysOptions,
type ImportSigningKeysResult,
InvalidExportFormatError,
MAX_EXPORT_SIGNING_KEYS,
MAX_EXPORT_STATES,
type PrivateStateExport,
PrivateStateExportError,
type PrivateStateId,
type PrivateStateProvider,
type SigningKeyExport,
SigningKeyExportError
} from '@midnight-ntwrk/midnight-js-types';
import { type AbstractSublevel } from 'abstract-level';
import { Buffer } from 'buffer';
import { createHash, randomBytes } from 'crypto';
import { Level } from 'level';
import * as superjson from 'superjson';
import { decryptValue, getPasswordFromProvider, type PrivateStoragePasswordProvider, StorageEncryption } from './storage-encryption';
/**
* The default name of the indexedDB database for Midnight.
*/
export const MN_LDB_DEFAULT_DB_NAME = 'midnight-level-db';
/**
* The default name of the private state store.
*/
export const MN_LDB_DEFAULT_PRIS_STORE_NAME = 'private-states';
/**
* The default name of the signing key store.
*/
export const MN_LDB_DEFAULT_KEY_STORE_NAME = 'signing-keys';
/**
* Configuration properties for the LevelDB based private state provider.
*/
export interface LevelPrivateStateProviderConfig {
/**
* The name of the LevelDB database used to store all Midnight related data.
*/
readonly midnightDbName: string;
/**
* The name of the object store containing private states.
*/
readonly privateStateStoreName: string;
/**
* The name of the object store containing signing keys.
*/
readonly signingKeyStoreName: string;
/**
* Provider function that returns the password used for encrypting private state.
* The password must be at least 16 characters long.
*
* SECURITY: Use a strong, secret password. Never use public key material
* or other non-secret values as the password source.
*
* @example
* ```typescript
* {
* privateStoragePasswordProvider: async () => await getSecretPassword()
* }
* ```
*/
readonly privateStoragePasswordProvider: PrivateStoragePasswordProvider;
/**
* Account identifier used to scope storage. This ensures data isolation
* between different accounts/wallets using the same database.
*
* The accountId is hashed (SHA-256, first 32 chars) before being used
* in storage paths, so any unique identifier can be used (e.g., wallet address).
*
* @example
* ```typescript
* {
* accountId: walletAddress
* }
* ```
*/
readonly accountId: string;
}
/**
* The default configuration for the level database.
*/
export const DEFAULT_CONFIG = {
/**
* The name of the database.
*/
midnightDbName: MN_LDB_DEFAULT_DB_NAME,
/**
* The name of the "level" on which to store private state.
*/
privateStateStoreName: MN_LDB_DEFAULT_PRIS_STORE_NAME,
/**
* The name of the "level" on which to store signing keys.
*/
signingKeyStoreName: MN_LDB_DEFAULT_KEY_STORE_NAME
};
superjson.registerCustom<Buffer, string>(
{
isApplicable: (v): v is Buffer => v instanceof Buffer,
serialize: (v) => v.toString('hex'),
deserialize: (v) => Buffer.from(v, 'hex')
},
'buffer'
);
const ACCOUNT_ID_HASH_LENGTH = 32;
const hashAccountId = (accountId: string): string => {
return createHash('sha256').update(accountId).digest('hex').substring(0, ACCOUNT_ID_HASH_LENGTH);
};
const getScopedLevelName = (baseLevelName: string, accountId: string): string => {
const hashedAccountId = hashAccountId(accountId);
return `${baseLevelName}:${hashedAccountId}`;
};
const withSubLevel = async <K, V, A>(
dbName: string,
levelName: string,
thunk: (subLevel: AbstractSublevel<Level, string | Uint8Array | Buffer, K, V>) => Promise<A>
): Promise<A> => {
const level = new Level(dbName, {
createIfMissing: true
});
const subLevel = level.sublevel<K, V>(levelName, {
valueEncoding: 'utf-8'
});
try {
await level.open();
await subLevel.open();
return await thunk(subLevel);
} finally {
await subLevel.close();
await level.close();
}
};
const METADATA_KEY = '__midnight_encryption_metadata__';
const DEFAULT_MAX_ROTATION_ENTRIES = 10000;
const encryptionInitPromises = new Map<string, Promise<Buffer>>();
const passwordRotationLocks = new Map<string, Promise<void>>();
export interface PasswordRotationResult {
readonly entriesMigrated: number;
}
export interface PasswordRotationOptions {
readonly maxEntries?: number;
}
interface EncryptionCacheEntry {
readonly encryption: StorageEncryption;
readonly saltHex: string;
}
/**
* Module-level cache for StorageEncryption instances, keyed by `${dbName}:${levelName}`.
* This cache avoids repeated PBKDF2 key derivation (600,000 iterations) on each operation.
*
* Note: This cache has no size limit. For typical usage with a small number of
* database/level combinations, this is acceptable. If using dynamic db/level names,
* call `invalidateEncryptionCache()` to prevent unbounded growth.
*/
const encryptionCache = new Map<string, EncryptionCacheEntry>();
const getOrCreateSalt = async (dbName: string, levelName: string): Promise<Buffer> => {
const lockKey = `${dbName}:${levelName}`;
const existingPromise = encryptionInitPromises.get(lockKey);
Iif (existingPromise) {
return existingPromise;
}
const initPromise = withSubLevel<string, string, Buffer>(dbName, levelName, async (subLevel) => {
try {
const metadataJson = await subLevel.get(METADATA_KEY);
if (metadataJson) {
const metadata = JSON.parse(metadataJson);
return Buffer.from(metadata.salt, 'hex');
}
} catch (error: unknown) {
if (!(error && typeof error === 'object' && 'code' in error && error.code === 'LEVEL_NOT_FOUND')) {
throw error;
}
}
const salt = randomBytes(32);
const metadata = {
salt: salt.toString('hex'),
version: 1
};
await subLevel.put(METADATA_KEY, JSON.stringify(metadata));
return salt;
});
encryptionInitPromises.set(lockKey, initPromise);
try {
return await initPromise;
} finally {
encryptionInitPromises.delete(lockKey);
}
};
const getOrCreateEncryption = async (
dbName: string,
levelName: string,
passwordProvider: PrivateStoragePasswordProvider
): Promise<StorageEncryption> => {
const cacheKey = `${dbName}:${levelName}`;
const salt = await getOrCreateSalt(dbName, levelName);
const saltHex = salt.toString('hex');
const cached = encryptionCache.get(cacheKey);
if (cached && cached.saltHex === saltHex) {
const password = await getPasswordFromProvider(passwordProvider);
if (cached.encryption.verifyPassword(password)) {
return cached.encryption;
}
const encryption = new StorageEncryption(password, salt);
encryptionCache.set(cacheKey, { encryption, saltHex });
return encryption;
}
const password = await getPasswordFromProvider(passwordProvider);
const encryption = new StorageEncryption(password, salt);
encryptionCache.set(cacheKey, { encryption, saltHex });
return encryption;
};
const invalidateEncryptionCacheForDb = (dbName: string, privateStateStoreName: string, signingKeyStoreName: string): void => {
const privateStateKey = `${dbName}:${privateStateStoreName}`;
const signingKeyKey = `${dbName}:${signingKeyStoreName}`;
encryptionCache.delete(privateStateKey);
encryptionCache.delete(signingKeyKey);
};
const DEFAULT_LOCK_TIMEOUT_MS = 300000; // 5 minutes
const withPasswordRotationLock = async <T>(
lockKey: string,
operation: () => Promise<T>,
timeoutMs: number = DEFAULT_LOCK_TIMEOUT_MS
): Promise<T> => {
const startWait = Date.now();
while (passwordRotationLocks.has(lockKey)) {
Iif (Date.now() - startWait > timeoutMs) {
throw new Error(
`Timed out waiting for password rotation lock on "${lockKey}". ` +
`Another rotation may be stuck or taking longer than ${timeoutMs}ms.`
);
}
await passwordRotationLocks.get(lockKey);
}
let resolve!: () => void;
const lockPromise = new Promise<void>((r) => {
resolve = r;
});
passwordRotationLocks.set(lockKey, lockPromise);
try {
return await operation();
} finally {
passwordRotationLocks.delete(lockKey);
resolve();
}
};
const waitForRotationLock = async (
dbName: string,
levelName: string,
timeoutMs: number = DEFAULT_LOCK_TIMEOUT_MS
): Promise<void> => {
const lockKey = `${dbName}:${levelName}`;
const startWait = Date.now();
while (passwordRotationLocks.has(lockKey)) {
Iif (Date.now() - startWait > timeoutMs) {
throw new Error(
`Timed out waiting for password rotation to complete on "${lockKey}". ` +
`The rotation may be stuck or taking longer than ${timeoutMs}ms.`
);
}
await passwordRotationLocks.get(lockKey);
}
};
interface RotateStorePasswordParams {
readonly dbName: string;
readonly storeName: string;
readonly oldPasswordProvider: PrivateStoragePasswordProvider;
readonly newPasswordProvider: PrivateStoragePasswordProvider;
readonly maxEntries: number;
readonly shouldProceed?: (key: string) => boolean;
}
const isDecryptionError = (error: unknown): boolean => {
Iif (!(error instanceof Error)) return false;
const message = error.message.toLowerCase();
return (
message.includes('unsupported state') ||
message.includes('salt mismatch') ||
message.includes('invalid encrypted data') ||
message.includes('bad decrypt') ||
message.includes('unable to authenticate')
);
};
const rotateStorePassword = async (
params: RotateStorePasswordParams
): Promise<PasswordRotationResult> => {
const { dbName, storeName, oldPasswordProvider, newPasswordProvider, maxEntries, shouldProceed } = params;
const oldPassword = await getPasswordFromProvider(oldPasswordProvider);
const newPassword = await getPasswordFromProvider(newPasswordProvider);
const salt = await getOrCreateSalt(dbName, storeName);
const oldEncryption = new StorageEncryption(oldPassword, salt);
const newEncryption = new StorageEncryption(newPassword);
const newSalt = newEncryption.getSalt();
return withSubLevel<string, string, PasswordRotationResult>(
dbName,
storeName,
async (subLevel) => {
const entriesToMigrate: { key: string; decryptedValue: string }[] = [];
let hasMatchingData = false;
let firstEntryValidated = false;
for await (const [key, encryptedValue] of subLevel.iterator()) {
if (key === METADATA_KEY) continue;
if (entriesToMigrate.length >= maxEntries) {
throw new Error(
`Entry count exceeds maximum allowed (${maxEntries}). ` +
`Use the maxEntries option to increase the limit if needed.`
);
}
if (shouldProceed && shouldProceed(key)) {
hasMatchingData = true;
}
if (!firstEntryValidated) {
try {
decryptValue(encryptedValue, oldEncryption, oldPassword);
} catch (error: unknown) {
Eif (isDecryptionError(error)) {
throw new Error('Old password is incorrect: failed to decrypt existing data', { cause: error });
}
throw error;
}
firstEntryValidated = true;
}
try {
const decryptedValue = decryptValue(encryptedValue, oldEncryption, oldPassword);
entriesToMigrate.push({ key, decryptedValue });
} catch (error: unknown) {
const errorMessage = error instanceof Error ? error.message : 'Unknown error';
throw new Error(
`Failed to decrypt entry "${key}": ${errorMessage}. ` +
`Successfully processed ${entriesToMigrate.length} entries before failure.`,
{ cause: error }
);
}
}
if (entriesToMigrate.length === 0) {
return { entriesMigrated: 0 };
}
Iif (shouldProceed && !hasMatchingData) {
return { entriesMigrated: 0 };
}
const operations: { type: 'put'; key: string; value: string }[] = [];
for (const { key, decryptedValue } of entriesToMigrate) {
try {
const encryptedValue = newEncryption.encrypt(decryptedValue);
operations.push({ type: 'put', key, value: encryptedValue });
} catch (error: unknown) {
const errorMessage = error instanceof Error ? error.message : 'Unknown error';
throw new Error(
`Failed to re-encrypt entry "${key}": ${errorMessage}. ` +
`Original data is still encrypted with old password.`,
{ cause: error }
);
}
}
const metadata = {
salt: newSalt.toString('hex'),
version: 1
};
operations.push({ type: 'put', key: METADATA_KEY, value: JSON.stringify(metadata) });
try {
await subLevel.batch(operations);
} catch (error: unknown) {
const errorMessage = error instanceof Error ? error.message : 'Unknown error';
throw new Error(
`Failed to write re-encrypted data: ${errorMessage}. ` +
`Your data may be in an inconsistent state. ` +
`Keep both old and new passwords until you can verify data integrity.`,
{ cause: error }
);
}
return { entriesMigrated: entriesToMigrate.length };
}
);
};
const subLevelMaybeGet = async <K, V>(
dbName: string,
levelName: string,
key: K,
passwordProvider: PrivateStoragePasswordProvider
): Promise<V | null> => {
await waitForRotationLock(dbName, levelName);
const encryption = await getOrCreateEncryption(dbName, levelName, passwordProvider);
return withSubLevel<K, string, V | null>(dbName, levelName, async (subLevel) => {
try {
const encryptedValue = await subLevel.get(key);
if (encryptedValue === undefined) {
return null;
}
let decryptedValue: string;
if (StorageEncryption.isEncrypted(encryptedValue)) {
const version = StorageEncryption.getVersion(encryptedValue);
if (version === 1) {
const password = await getPasswordFromProvider(passwordProvider);
decryptedValue = encryption.decryptWithPassword(encryptedValue, password);
const reEncrypted = encryption.encrypt(decryptedValue);
await subLevel.put(key, reEncrypted);
} else {
decryptedValue = encryption.decrypt(encryptedValue);
}
} else E{
decryptedValue = encryptedValue;
const reEncrypted = encryption.encrypt(encryptedValue);
await subLevel.put(key, reEncrypted);
}
const value = superjson.parse<V>(decryptedValue);
Iif (value === undefined) {
return null;
}
return value;
} catch (error: unknown) {
Iif (error && typeof error === 'object' && 'code' in error && error.code === 'LEVEL_NOT_FOUND') {
return null;
}
throw error;
}
});
};
/**
* Iterate all key-value pairs in a sublevel, excluding metadata keys.
*/
const getAllEntries = async <K extends string, V>(
dbName: string,
levelName: string,
passwordProvider: PrivateStoragePasswordProvider
): Promise<Map<K, V>> => {
await waitForRotationLock(dbName, levelName);
const encryption = await getOrCreateEncryption(dbName, levelName, passwordProvider);
return withSubLevel<K, string, Map<K, V>>(dbName, levelName, async (subLevel) => {
const entries = new Map<K, V>();
let password: string | null = null;
for await (const [key, encryptedValue] of subLevel.iterator()) {
if (key === METADATA_KEY) {
continue;
}
let decryptedValue: string;
let needsReEncryption = false;
if (StorageEncryption.isEncrypted(encryptedValue)) {
const version = StorageEncryption.getVersion(encryptedValue);
Iif (version === 1) {
if (password === null) {
password = await getPasswordFromProvider(passwordProvider);
}
decryptedValue = encryption.decryptWithPassword(encryptedValue, password);
needsReEncryption = true;
} else {
decryptedValue = encryption.decrypt(encryptedValue);
}
} else E{
decryptedValue = encryptedValue;
needsReEncryption = true;
}
Iif (needsReEncryption) {
const reEncrypted = encryption.encrypt(decryptedValue);
await subLevel.put(key, reEncrypted);
}
const value = superjson.parse<V>(decryptedValue);
entries.set(key as K, value);
}
return entries;
});
};
/**
* Internal structure of the decrypted export payload.
* Includes metadata to ensure it's authenticated by the encryption.
*/
interface PrivateStatePayload<PSI extends PrivateStateId = PrivateStateId> {
readonly version: number;
readonly exportedAt: string;
readonly stateCount: number;
readonly states: Record<PSI, string>;
}
/**
* Internal structure of the decrypted signing key export payload.
* Includes metadata to ensure it's authenticated by the encryption.
*/
interface SigningKeyPayload {
readonly version: number;
readonly exportedAt: string;
readonly keyCount: number;
readonly keys: Record<ContractAddress, SigningKey>;
}
const CURRENT_EXPORT_VERSION = 1;
const SUPPORTED_EXPORT_VERSIONS = [1];
const EXPECTED_SALT_LENGTH = 64; // 32 bytes as hex
const MIN_PASSWORD_LENGTH = 16;
/**
* Validates a custom password meets minimum requirements.
*/
const validateExportPassword = (password: string): void => {
if (password.length < MIN_PASSWORD_LENGTH) {
throw new PrivateStateExportError(
`Password must be at least ${MIN_PASSWORD_LENGTH} characters`
);
}
};
/**
* Validates the salt format and length.
*/
const validateSalt = (salt: string): void => {
if (salt.length !== EXPECTED_SALT_LENGTH) {
throw new InvalidExportFormatError('Invalid salt length');
}
if (!/^[0-9a-fA-F]+$/.test(salt)) {
throw new InvalidExportFormatError('Invalid salt format');
}
};
/**
* Validates a custom signing key export password meets minimum requirements.
*/
const validateSigningKeyExportPassword = (password: string): void => {
if (password.length < MIN_PASSWORD_LENGTH) {
throw new SigningKeyExportError(
`Password must be at least ${MIN_PASSWORD_LENGTH} characters`
);
}
};
const BROWSER_WARNING_KEY = '__midnight_browser_warning_shown__';
const isBrowserEnvironment = (): boolean => {
const global = globalThis as Record<string, unknown>;
return typeof globalThis !== 'undefined' &&
'window' in globalThis &&
global.window !== undefined &&
'document' in globalThis &&
global.document !== undefined;
};
const getSessionStorage = (): Storage | undefined => {
Eif (typeof globalThis !== 'undefined' && 'sessionStorage' in globalThis) {
return (globalThis as Record<string, unknown>).sessionStorage as Storage | undefined;
}
return undefined;
};
/**
* Shows a warning about browser storage risks.
* Only shows once per session using sessionStorage.
*/
const showBrowserWarning = (): void => {
if (!isBrowserEnvironment()) {
return;
}
try {
const storage = getSessionStorage();
Eif (storage) {
if (storage.getItem(BROWSER_WARNING_KEY)) {
return;
}
storage.setItem(BROWSER_WARNING_KEY, 'true');
}
} catch (error: unknown) {
console.debug(
'MIDNIGHT: Could not access sessionStorage for warning deduplication:',
error instanceof Error ? error.message : 'Unknown error'
);
}
console.warn(
`⚠️ MIDNIGHT: Private state and signing keys are stored in browser storage.\n` +
`Clearing browser cache or storage will permanently destroy this data.\n` +
`For assets with real-world value, this may result in irreversible financial loss.\n` +
`Use exportPrivateStates() and exportSigningKeys() to create backups.`
);
};
/* eslint-disable @typescript-eslint/no-explicit-any */
/**
* Constructs an instance of {@link PrivateStateProvider} based on {@link Level} database.
*
* ⚠️ WARNING
*
* RISK: This provider lacks a recovery mechanism.
* Clearing browser cache or deleting local files permanently destroys the private state (contract state/keys).
* For assets with real-world value, this may result in irreversible financial loss.
* DO NOT use for production applications requiring data persistence.
*
* @param config Database configuration options.
*/
export const levelPrivateStateProvider = <PSI extends PrivateStateId, PS = any>(
config: Partial<LevelPrivateStateProviderConfig> & Pick<LevelPrivateStateProviderConfig, 'privateStoragePasswordProvider' | 'accountId'>
): PrivateStateProvider<PSI, PS> & {
invalidateEncryptionCache(): void;
changePassword(
oldPasswordProvider: PrivateStoragePasswordProvider,
newPasswordProvider: PrivateStoragePasswordProvider,
options?: PasswordRotationOptions
): Promise<PasswordRotationResult>;
changeSigningKeysPassword(
oldPasswordProvider: PrivateStoragePasswordProvider,
newPasswordProvider: PrivateStoragePasswordProvider,
options?: PasswordRotationOptions
): Promise<PasswordRotationResult>;
} => {
const fullConfig = { ...DEFAULT_CONFIG, ...config };
if (!config.privateStoragePasswordProvider) {
throw new Error(
'privateStoragePasswordProvider is required.\n' +
'Provide a function that returns a strong, secret password (minimum 16 characters).'
);
}
if (!config.accountId || config.accountId.trim().length === 0) {
throw new Error(
'accountId is required.\n' +
'Provide an account identifier (e.g., wallet address) to scope storage and prevent cross-account data access.'
);
}
const passwordProvider: PrivateStoragePasswordProvider = config.privateStoragePasswordProvider;
const scopedPrivateStateLevelName = getScopedLevelName(fullConfig.privateStateStoreName, config.accountId);
const scopedSigningKeyLevelName = getScopedLevelName(fullConfig.signingKeyStoreName, config.accountId);
showBrowserWarning();
let contractAddress: ContractAddress | null = null;
const getScopedKey = (privateStateId: PSI): string => {
if (contractAddress === null) {
throw new Error('Contract address not set. Call setContractAddress() before accessing private state.');
}
return `${contractAddress}:${privateStateId}`;
};
return {
setContractAddress(address: ContractAddress): void {
contractAddress = address;
},
async get(privateStateId: PSI): Promise<PS | null> {
const scopedKey = getScopedKey(privateStateId);
return subLevelMaybeGet<string, PS>(
fullConfig.midnightDbName,
scopedPrivateStateLevelName,
scopedKey,
passwordProvider
);
},
async remove(privateStateId: PSI): Promise<void> {
await waitForRotationLock(fullConfig.midnightDbName, scopedPrivateStateLevelName);
const scopedKey = getScopedKey(privateStateId);
return withSubLevel<string, string, void>(fullConfig.midnightDbName, scopedPrivateStateLevelName, (subLevel) =>
subLevel.del(scopedKey)
);
},
async set(privateStateId: PSI, state: PS): Promise<void> {
await waitForRotationLock(fullConfig.midnightDbName, scopedPrivateStateLevelName);
const scopedKey = getScopedKey(privateStateId);
const encryption = await getOrCreateEncryption(
fullConfig.midnightDbName,
scopedPrivateStateLevelName,
passwordProvider
);
const serialized = superjson.stringify(state);
const encrypted = encryption.encrypt(serialized);
return withSubLevel<string, string, void>(fullConfig.midnightDbName, scopedPrivateStateLevelName, (subLevel) =>
subLevel.put(scopedKey, encrypted)
);
},
async clear(): Promise<void> {
if (contractAddress === null) {
throw new Error('Contract address not set. Call setContractAddress() before accessing private state.');
}
return withSubLevel(fullConfig.midnightDbName, scopedPrivateStateLevelName, (subLevel) => subLevel.clear());
},
getSigningKey(address: ContractAddress): Promise<SigningKey | null> {
return subLevelMaybeGet<ContractAddress, SigningKey>(
fullConfig.midnightDbName,
scopedSigningKeyLevelName,
address,
passwordProvider
);
},
async removeSigningKey(address: ContractAddress): Promise<void> {
await waitForRotationLock(fullConfig.midnightDbName, scopedSigningKeyLevelName);
return withSubLevel<ContractAddress, string, void>(
fullConfig.midnightDbName,
scopedSigningKeyLevelName,
(subLevel) => subLevel.del(address)
);
},
async setSigningKey(address: ContractAddress, signingKey: SigningKey): Promise<void> {
await waitForRotationLock(fullConfig.midnightDbName, scopedSigningKeyLevelName);
const encryption = await getOrCreateEncryption(
fullConfig.midnightDbName,
scopedSigningKeyLevelName,
passwordProvider
);
const serialized = superjson.stringify(signingKey);
const encrypted = encryption.encrypt(serialized);
return withSubLevel<ContractAddress, string, void>(
fullConfig.midnightDbName,
scopedSigningKeyLevelName,
(subLevel) => subLevel.put(address, encrypted)
);
},
clearSigningKeys(): Promise<void> {
return withSubLevel(fullConfig.midnightDbName, scopedSigningKeyLevelName, (subLevel) => subLevel.clear());
},
async exportPrivateStates(options?: ExportPrivateStatesOptions): Promise<PrivateStateExport> {
Iif (contractAddress === null) {
throw new Error('Contract address not set. Call setContractAddress() before exporting private states.');
}
const maxStates = options?.maxStates ?? MAX_EXPORT_STATES;
// Validate custom password if provided
if (options?.password !== undefined) {
validateExportPassword(options.password);
}
// Determine export password - use provided password or storage password
const exportPassword = options?.password ?? await getPasswordFromProvider(passwordProvider);
// Get all private states (not signing keys)
const allStates = await getAllEntries<string, PS>(
fullConfig.midnightDbName,
scopedPrivateStateLevelName,
passwordProvider
);
// Filter and extract only states for the current contract address
const prefix = `${contractAddress}:`;
const states = new Map<PSI, PS>();
for (const [scopedKey, value] of allStates.entries()) {
Eif (scopedKey.startsWith(prefix)) {
const rawStateId = scopedKey.slice(prefix.length) as PSI;
states.set(rawStateId, value);
}
}
if (states.size === 0) {
throw new PrivateStateExportError('No private states to export');
}
if (states.size > maxStates) {
throw new PrivateStateExportError(
`Too many states to export (${states.size}). Maximum allowed: ${maxStates}`
);
}
// Serialize states using superjson (to preserve types like BigInt, Buffer, etc.)
// Include metadata in the encrypted payload to ensure it's authenticated
const payload: PrivateStatePayload<PSI> = {
version: CURRENT_EXPORT_VERSION,
exportedAt: new Date().toISOString(),
stateCount: states.size,
states: Object.fromEntries(
Array.from(states.entries()).map(([key, value]) => [key, superjson.stringify(value)])
) as Record<PSI, string>
};
// Create new encryption instance for export (different salt from storage)
const exportEncryption = new StorageEncryption(exportPassword);
const encryptedPayload = exportEncryption.encrypt(JSON.stringify(payload));
return {
format: 'midnight-private-state-export',
encryptedPayload,
salt: exportEncryption.getSalt().toString('hex')
};
},
async importPrivateStates(
exportData: PrivateStateExport,
options?: ImportPrivateStatesOptions
): Promise<ImportPrivateStatesResult> {
Iif (contractAddress === null) {
throw new Error('Contract address not set. Call setContractAddress() before importing private states.');
}
const conflictStrategy = options?.conflictStrategy ?? 'error';
const maxStates = options?.maxStates ?? MAX_EXPORT_STATES;
// Validate format identifier
if (exportData.format !== 'midnight-private-state-export') {
throw new InvalidExportFormatError('Unrecognized export format');
}
// Validate structure
if (!exportData.encryptedPayload || !exportData.salt) {
throw new InvalidExportFormatError('Missing required fields');
}
// Validate salt format
validateSalt(exportData.salt);
// Validate custom password if provided
if (options?.password !== undefined) {
validateExportPassword(options.password);
}
// Determine import password - use provided password or storage password
const importPassword = options?.password ?? await getPasswordFromProvider(passwordProvider);
// Decrypt the payload - use single generic error to prevent oracle attacks
let payload: PrivateStatePayload<PSI>;
try {
const salt = Buffer.from(exportData.salt, 'hex');
const importEncryption = new StorageEncryption(importPassword, salt);
const decryptedJson = importEncryption.decrypt(exportData.encryptedPayload);
payload = JSON.parse(decryptedJson);
} catch {
// Single generic error - don't reveal whether password was wrong or data was corrupted
throw new ExportDecryptionError();
}
// Validate payload structure (metadata is now inside encrypted payload)
if (
!payload.states ||
typeof payload.states !== 'object' ||
typeof payload.version !== 'number' ||
typeof payload.stateCount !== 'number'
) {
throw new ExportDecryptionError();
}
// Validate version from authenticated payload
if (!SUPPORTED_EXPORT_VERSIONS.includes(payload.version)) {
throw new InvalidExportFormatError(
`Export version ${payload.version} is not supported. Supported versions: ${SUPPORTED_EXPORT_VERSIONS.join(', ')}`
);
}
// stateIds are raw state IDs (not scoped with contract address)
const stateIds = Object.keys(payload.states) as PSI[];
// Validate state count matches and is within limits
if (stateIds.length !== payload.stateCount) {
throw new ExportDecryptionError();
}
if (stateIds.length > maxStates) {
throw new InvalidExportFormatError(
`Too many states in export (${stateIds.length}). Maximum allowed: ${maxStates}`
);
}
// Check for conflicts if strategy is 'error'
// Use this.get() which properly scopes the state IDs
if (conflictStrategy === 'error') {
let conflictCount = 0;
for (const stateId of stateIds) {
const existing = await this.get(stateId);
if (existing !== null) {
conflictCount++;
}
}
if (conflictCount > 0) {
throw new ImportConflictError(conflictCount);
}
}
// Import states
let imported = 0;
let skipped = 0;
let overwritten = 0;
for (const stateId of stateIds) {
const serializedState = payload.states[stateId];
const existingState = await this.get(stateId);
if (existingState !== null) {
if (conflictStrategy === 'skip') {
skipped++;
continue;
} else if (EconflictStrategy === 'overwrite') {
overwritten++;
}
}
// Deserialize and store the state
const state = superjson.parse<PS>(serializedState);
await this.set(stateId, state);
if (existingState === null) {
imported++;
}
}
return { imported, skipped, overwritten };
},
async exportSigningKeys(options?: ExportSigningKeysOptions): Promise<SigningKeyExport> {
const maxKeys = options?.maxKeys ?? MAX_EXPORT_SIGNING_KEYS;
if (options?.password !== undefined) {
validateSigningKeyExportPassword(options.password);
}
const exportPassword = options?.password ?? await getPasswordFromProvider(passwordProvider);
const allKeys = await getAllEntries<ContractAddress, SigningKey>(
fullConfig.midnightDbName,
scopedSigningKeyLevelName,
passwordProvider
);
if (allKeys.size === 0) {
throw new SigningKeyExportError('No signing keys to export');
}
if (allKeys.size > maxKeys) {
throw new SigningKeyExportError(
`Too many keys to export (${allKeys.size}). Maximum allowed: ${maxKeys}`
);
}
const payload: SigningKeyPayload = {
version: CURRENT_EXPORT_VERSION,
exportedAt: new Date().toISOString(),
keyCount: allKeys.size,
keys: Object.fromEntries(allKeys.entries()) as Record<ContractAddress, SigningKey>
};
const exportEncryption = new StorageEncryption(exportPassword);
const encryptedPayload = exportEncryption.encrypt(JSON.stringify(payload));
return {
format: 'midnight-signing-key-export',
encryptedPayload,
salt: exportEncryption.getSalt().toString('hex')
};
},
async importSigningKeys(
exportData: SigningKeyExport,
options?: ImportSigningKeysOptions
): Promise<ImportSigningKeysResult> {
const conflictStrategy = options?.conflictStrategy ?? 'error';
const maxKeys = options?.maxKeys ?? MAX_EXPORT_SIGNING_KEYS;
if (exportData.format !== 'midnight-signing-key-export') {
throw new InvalidExportFormatError('Unrecognized export format');
}
if (!exportData.encryptedPayload || !exportData.salt) {
throw new InvalidExportFormatError('Missing required fields');
}
validateSalt(exportData.salt);
if (options?.password !== undefined) {
validateSigningKeyExportPassword(options.password);
}
const importPassword = options?.password ?? await getPasswordFromProvider(passwordProvider);
let payload: SigningKeyPayload;
try {
const salt = Buffer.from(exportData.salt, 'hex');
const importEncryption = new StorageEncryption(importPassword, salt);
const decryptedJson = importEncryption.decrypt(exportData.encryptedPayload);
payload = JSON.parse(decryptedJson);
} catch {
throw new ExportDecryptionError();
}
if (
!payload.keys ||
typeof payload.keys !== 'object' ||
typeof payload.version !== 'number' ||
typeof payload.keyCount !== 'number'
) {
throw new ExportDecryptionError();
}
if (!SUPPORTED_EXPORT_VERSIONS.includes(payload.version)) {
throw new InvalidExportFormatError(
`Export version ${payload.version} is not supported. Supported versions: ${SUPPORTED_EXPORT_VERSIONS.join(', ')}`
);
}
const addresses = Object.keys(payload.keys) as ContractAddress[];
if (addresses.length !== payload.keyCount) {
throw new ExportDecryptionError();
}
if (addresses.length > maxKeys) {
throw new InvalidExportFormatError(
`Too many keys in export (${addresses.length}). Maximum allowed: ${maxKeys}`
);
}
if (conflictStrategy === 'error') {
let conflictCount = 0;
for (const address of addresses) {
const existing = await this.getSigningKey(address);
if (existing !== null) {
conflictCount++;
}
}
if (conflictCount > 0) {
throw new ImportConflictError(conflictCount, 'signing key');
}
}
let imported = 0;
let skipped = 0;
let overwritten = 0;
for (const address of addresses) {
const signingKey = payload.keys[address];
const existingKey = await this.getSigningKey(address);
if (existingKey !== null) {
if (conflictStrategy === 'skip') {
skipped++;
continue;
} else if (EconflictStrategy === 'overwrite') {
overwritten++;
}
}
await this.setSigningKey(address, signingKey);
if (existingKey === null) {
imported++;
}
}
return { imported, skipped, overwritten };
},
async changePassword(
oldPasswordProvider: PrivateStoragePasswordProvider,
newPasswordProvider: PrivateStoragePasswordProvider,
options?: PasswordRotationOptions
): Promise<PasswordRotationResult> {
if (contractAddress === null) {
throw new Error('Contract address not set. Call setContractAddress() before changing password.');
}
const lockKey = `${fullConfig.midnightDbName}:${scopedPrivateStateLevelName}`;
const prefix = `${contractAddress}:`;
return withPasswordRotationLock(lockKey, async () => {
const result = await rotateStorePassword({
dbName: fullConfig.midnightDbName,
storeName: scopedPrivateStateLevelName,
oldPasswordProvider,
newPasswordProvider,
maxEntries: options?.maxEntries ?? DEFAULT_MAX_ROTATION_ENTRIES,
shouldProceed: (key) => key.startsWith(prefix)
});
invalidateEncryptionCacheForDb(
fullConfig.midnightDbName,
scopedPrivateStateLevelName,
scopedSigningKeyLevelName
);
return result;
});
},
async changeSigningKeysPassword(
oldPasswordProvider: PrivateStoragePasswordProvider,
newPasswordProvider: PrivateStoragePasswordProvider,
options?: PasswordRotationOptions
): Promise<PasswordRotationResult> {
const lockKey = `${fullConfig.midnightDbName}:${scopedSigningKeyLevelName}`;
return withPasswordRotationLock(lockKey, async () => {
const result = await rotateStorePassword({
dbName: fullConfig.midnightDbName,
storeName: scopedSigningKeyLevelName,
oldPasswordProvider,
newPasswordProvider,
maxEntries: options?.maxEntries ?? DEFAULT_MAX_ROTATION_ENTRIES
});
invalidateEncryptionCacheForDb(
fullConfig.midnightDbName,
scopedPrivateStateLevelName,
scopedSigningKeyLevelName
);
return result;
});
},
invalidateEncryptionCache(): void {
invalidateEncryptionCacheForDb(
fullConfig.midnightDbName,
scopedPrivateStateLevelName,
scopedSigningKeyLevelName
);
}
};
};
export interface MigrationResult {
readonly privateStatesMigrated: number;
readonly signingKeysMigrated: number;
}
const migrateSublevel = async (
dbName: string,
oldLevelName: string,
newLevelName: string
): Promise<number> => {
const level = new Level(dbName, { createIfMissing: true });
try {
await level.open();
const oldSubLevel = level.sublevel<string, string>(oldLevelName, {
valueEncoding: 'utf-8'
});
const newSubLevel = level.sublevel<string, string>(newLevelName, {
valueEncoding: 'utf-8'
});
try {
await oldSubLevel.open();
} catch (error: unknown) {
const errorMessage = error instanceof Error ? error.message : 'Unknown error';
throw new Error(
`Failed to open source sublevel "${oldLevelName}": ${errorMessage}. ` +
`Ensure no other process is accessing the database.`,
{ cause: error }
);
}
try {
await newSubLevel.open();
} catch (error: unknown) {
const errorMessage = error instanceof Error ? error.message : 'Unknown error';
throw new Error(
`Failed to open target sublevel "${newLevelName}": ${errorMessage}. ` +
`Ensure no other process is accessing the database.`,
{ cause: error }
);
}
let count = 0;
const operations: { type: 'put'; key: string; value: string }[] = [];
try {
for await (const [key, value] of oldSubLevel.iterator()) {
operations.push({ type: 'put', key, value });
count++;
}
} catch (error: unknown) {
const errorMessage = error instanceof Error ? error.message : 'Unknown error';
throw new Error(
`Failed to read data from source sublevel "${oldLevelName}" after ${count} entries: ${errorMessage}. ` +
`Migration incomplete. Source data is unchanged.`,
{ cause: error }
);
}
if (operations.length > 0) {
try {
await newSubLevel.batch(operations);
} catch (error: unknown) {
const errorMessage = error instanceof Error ? error.message : 'Unknown error';
throw new Error(
`Failed to write ${operations.length} entries to target sublevel "${newLevelName}": ${errorMessage}. ` +
`Migration incomplete. Target sublevel may contain partial data. ` +
`Source data at "${oldLevelName}" is unchanged.`,
{ cause: error }
);
}
}
await newSubLevel.close();
await oldSubLevel.close();
return count;
} finally {
try {
await level.close();
} catch {
// Don't mask the original error - just ignore the close failure
}
}
};
/**
* Migrates existing unscoped private state and signing key data to account-scoped sublevels.
*
* This function copies data from the legacy unscoped locations to the new account-scoped
* locations. The original data is preserved (not deleted) to allow for safe rollback if needed.
* To remove old data after successful migration, manually clear the unscoped sublevels.
*
* Note: Running this function multiple times is safe but will re-copy all data, overwriting
* any changes made in the scoped location since the last migration.
*/
export const migrateToAccountScoped = async (
config: Partial<LevelPrivateStateProviderConfig> & Pick<LevelPrivateStateProviderConfig, 'accountId'>
): Promise<MigrationResult> => {
const fullConfig = { ...DEFAULT_CONFIG, ...config };
if (!config.accountId || config.accountId.trim().length === 0) {
throw new Error('accountId is required for migration');
}
const scopedPrivateStateLevelName = getScopedLevelName(
fullConfig.privateStateStoreName,
config.accountId
);
const scopedSigningKeyLevelName = getScopedLevelName(
fullConfig.signingKeyStoreName,
config.accountId
);
let privateStatesMigrated: number;
try {
privateStatesMigrated = await migrateSublevel(
fullConfig.midnightDbName,
fullConfig.privateStateStoreName,
scopedPrivateStateLevelName
);
} catch (error: unknown) {
const errorMessage = error instanceof Error ? error.message : 'Unknown error';
throw new Error(
`Migration failed during private states copy: ${errorMessage}. ` +
`No data has been migrated. Source data is unchanged.`,
{ cause: error }
);
}
let signingKeysMigrated: number;
try {
signingKeysMigrated = await migrateSublevel(
fullConfig.midnightDbName,
fullConfig.signingKeyStoreName,
scopedSigningKeyLevelName
);
} catch (error: unknown) {
const errorMessage = error instanceof Error ? error.message : 'Unknown error';
throw new Error(
`Migration failed during signing keys copy: ${errorMessage}. ` +
`WARNING: ${privateStatesMigrated} private states were already migrated to scoped location. ` +
`Signing keys remain at original location. Manual intervention may be required.`,
{ cause: error }
);
}
return { privateStatesMigrated, signingKeysMigrated };
};
|