BlueWallet/class/app-storage.js
2023-03-26 19:43:25 +01:00

869 lines
28 KiB
JavaScript

import AsyncStorage from '@react-native-async-storage/async-storage';
import RNSecureKeyStore, { ACCESSIBLE } from 'react-native-secure-key-store';
import * as Keychain from 'react-native-keychain';
import {
HDLegacyBreadwalletWallet,
HDSegwitP2SHWallet,
HDLegacyP2PKHWallet,
WatchOnlyWallet,
LegacyWallet,
SegwitP2SHWallet,
SegwitBech32Wallet,
HDSegwitBech32Wallet,
LightningCustodianWallet,
HDLegacyElectrumSeedP2PKHWallet,
HDSegwitElectrumSeedP2WPKHWallet,
HDAezeedWallet,
MultisigHDWallet,
LightningLdkWallet,
SLIP39SegwitP2SHWallet,
SLIP39LegacyP2PKHWallet,
SLIP39SegwitBech32Wallet,
} from './';
import { randomBytes } from './rng';
import alert from '../components/Alert';
const encryption = require('../blue_modules/encryption');
const Realm = require('realm');
const createHash = require('create-hash');
let usedBucketNum = false;
let savingInProgress = 0; // its both a flag and a counter of attempts to write to disk
export class AppStorage {
static FLAG_ENCRYPTED = 'data_encrypted';
static LNDHUB = 'lndhub';
static ADVANCED_MODE_ENABLED = 'advancedmodeenabled';
static DO_NOT_TRACK = 'donottrack';
static HANDOFF_STORAGE_KEY = 'HandOff';
static keys2migrate = [AppStorage.HANDOFF_STORAGE_KEY, AppStorage.DO_NOT_TRACK, AppStorage.ADVANCED_MODE_ENABLED];
constructor() {
/** {Array.<AbstractWallet>} */
this.wallets = [];
this.tx_metadata = {};
this.cachedPassword = false;
}
async migrateKeys() {
if (!(typeof navigator !== 'undefined' && navigator.product === 'ReactNative')) return;
for (const key of this.constructor.keys2migrate) {
try {
const value = await RNSecureKeyStore.get(key);
if (value) {
await AsyncStorage.setItem(key, value);
await RNSecureKeyStore.remove(key);
}
} catch (_) {}
}
}
/**
* Wrapper for storage call. Secure store works only in RN environment. AsyncStorage is
* used for cli/tests
*
* @param key
* @param value
* @returns {Promise<any>|Promise<any> | Promise<void> | * | Promise | void}
*/
setItem = (key, value) => {
if (typeof navigator !== 'undefined' && navigator.product === 'ReactNative') {
return RNSecureKeyStore.set(key, value, { accessible: ACCESSIBLE.WHEN_UNLOCKED_THIS_DEVICE_ONLY });
} else {
return AsyncStorage.setItem(key, value);
}
};
/**
* Wrapper for storage call. Secure store works only in RN environment. AsyncStorage is
* used for cli/tests
*
* @param key
* @returns {Promise<any>|*}
*/
getItem = key => {
if (typeof navigator !== 'undefined' && navigator.product === 'ReactNative') {
return RNSecureKeyStore.get(key);
} else {
return AsyncStorage.getItem(key);
}
};
/**
* @throws Error
* @param key {string}
* @returns {Promise<*>|null}
*/
getItemWithFallbackToRealm = async key => {
let value;
try {
return await this.getItem(key);
} catch (error) {
console.warn('error reading', key, error.message);
console.warn('fallback to realm');
const realmKeyValue = await this.openRealmKeyValue();
const obj = realmKeyValue.objectForPrimaryKey('KeyValue', key); // search for a realm object with a primary key
value = obj?.value;
realmKeyValue.close();
if (value) {
console.warn('successfully recovered', value.length, 'bytes from realm for key', key);
return value;
}
return null;
}
};
storageIsEncrypted = async () => {
let data;
try {
data = await this.getItemWithFallbackToRealm(AppStorage.FLAG_ENCRYPTED);
} catch (error) {
console.warn('error reading `' + AppStorage.FLAG_ENCRYPTED + '` key:', error.message);
return false;
}
return !!data;
};
isPasswordInUse = async password => {
try {
let data = await this.getItem('data');
data = this.decryptData(data, password);
return !!data;
} catch (_e) {
return false;
}
};
/**
* Iterates through all values of `data` trying to
* decrypt each one, and returns first one successfully decrypted
*
* @param data {string} Serialized array
* @param password
* @returns {boolean|string} Either STRING of storage data (which is stringified JSON) or FALSE, which means failure
*/
decryptData(data, password) {
data = JSON.parse(data);
let decrypted;
let num = 0;
for (const value of data) {
decrypted = encryption.decrypt(value, password);
if (decrypted) {
usedBucketNum = num;
return decrypted;
}
num++;
}
return false;
}
decryptStorage = async password => {
if (password === this.cachedPassword) {
this.cachedPassword = undefined;
await this.saveToDisk();
this.wallets = [];
this.tx_metadata = [];
return this.loadFromDisk();
} else {
throw new Error('Incorrect password. Please, try again.');
}
};
encryptStorage = async password => {
// assuming the storage is not yet encrypted
await this.saveToDisk();
let data = await this.getItem('data');
// TODO: refactor ^^^ (should not save & load to fetch data)
const encrypted = encryption.encrypt(data, password);
data = [];
data.push(encrypted); // putting in array as we might have many buckets with storages
data = JSON.stringify(data);
this.cachedPassword = password;
await this.setItem('data', data);
await this.setItem(AppStorage.FLAG_ENCRYPTED, '1');
};
/**
* Cleans up all current application data (wallets, tx metadata etc)
* Encrypts the bucket and saves it storage
*
* @returns {Promise.<boolean>} Success or failure
*/
createFakeStorage = async fakePassword => {
usedBucketNum = false; // resetting currently used bucket so we wont overwrite it
this.wallets = [];
this.tx_metadata = {};
const data = {
wallets: [],
tx_metadata: {},
};
let buckets = await this.getItem('data');
buckets = JSON.parse(buckets);
buckets.push(encryption.encrypt(JSON.stringify(data), fakePassword));
this.cachedPassword = fakePassword;
const bucketsString = JSON.stringify(buckets);
await this.setItem('data', bucketsString);
return (await this.getItem('data')) === bucketsString;
};
hashIt = s => {
return createHash('sha256').update(s).digest().toString('hex');
};
/**
* Returns instace of the Realm database, which is encrypted either by cached user's password OR default password.
* Database file is deterministically derived from encryption key.
*
* @returns {Promise<Realm>}
*/
async getRealm() {
const password = this.hashIt(this.cachedPassword || 'fyegjitkyf[eqjnc.lf');
const buf = Buffer.from(this.hashIt(password) + this.hashIt(password), 'hex');
const encryptionKey = Int8Array.from(buf);
const path = this.hashIt(this.hashIt(password)) + '-wallettransactions.realm';
const schema = [
{
name: 'WalletTransactions',
properties: {
walletid: { type: 'string', indexed: true },
internal: 'bool?', // true - internal, false - external
index: 'int?',
tx: 'string', // stringified json
},
},
];
return Realm.open({
schema,
path,
encryptionKey,
});
}
/**
* Returns instace of the Realm database, which is encrypted by device unique id
* Database file is static.
*
* @returns {Promise<Realm>}
*/
async openRealmKeyValue() {
const service = 'realm_encryption_key';
let password;
const credentials = await Keychain.getGenericPassword({ service });
if (credentials) {
password = credentials.password;
} else {
const buf = await randomBytes(64);
password = buf.toString('hex');
await Keychain.setGenericPassword(service, password, { service });
}
const buf = Buffer.from(password, 'hex');
const encryptionKey = Int8Array.from(buf);
const path = 'keyvalue.realm';
const schema = [
{
name: 'KeyValue',
primaryKey: 'key',
properties: {
key: { type: 'string', indexed: true },
value: 'string', // stringified json, or whatever
},
},
];
return Realm.open({
schema,
path,
encryptionKey,
});
}
saveToRealmKeyValue(realmkeyValue, key, value) {
realmkeyValue.write(() => {
realmkeyValue.create(
'KeyValue',
{
key,
value,
},
Realm.UpdateMode.Modified,
);
});
}
/**
* Loads from storage all wallets and
* maps them to `this.wallets`
*
* @param password If present means storage must be decrypted before usage
* @returns {Promise.<boolean>}
*/
async loadFromDisk(password) {
let data = await this.getItemWithFallbackToRealm('data');
if (password) {
data = this.decryptData(data, password);
if (data) {
// password is good, cache it
this.cachedPassword = password;
}
}
if (data !== null) {
let realm;
try {
realm = await this.getRealm();
} catch (error) {
alert(error.message);
}
data = JSON.parse(data);
if (!data.wallets) return false;
const wallets = data.wallets;
for (const key of wallets) {
// deciding which type is wallet and instatiating correct object
const tempObj = JSON.parse(key);
let unserializedWallet;
switch (tempObj.type) {
case SegwitBech32Wallet.type:
unserializedWallet = SegwitBech32Wallet.fromJson(key);
break;
case SegwitP2SHWallet.type:
unserializedWallet = SegwitP2SHWallet.fromJson(key);
break;
case WatchOnlyWallet.type:
unserializedWallet = WatchOnlyWallet.fromJson(key);
unserializedWallet.init();
if (unserializedWallet.isHd() && !unserializedWallet.isXpubValid()) {
continue;
}
break;
case HDLegacyP2PKHWallet.type:
unserializedWallet = HDLegacyP2PKHWallet.fromJson(key);
break;
case HDSegwitP2SHWallet.type:
unserializedWallet = HDSegwitP2SHWallet.fromJson(key);
break;
case HDSegwitBech32Wallet.type:
unserializedWallet = HDSegwitBech32Wallet.fromJson(key);
break;
case HDLegacyBreadwalletWallet.type:
unserializedWallet = HDLegacyBreadwalletWallet.fromJson(key);
break;
case HDLegacyElectrumSeedP2PKHWallet.type:
unserializedWallet = HDLegacyElectrumSeedP2PKHWallet.fromJson(key);
break;
case HDSegwitElectrumSeedP2WPKHWallet.type:
unserializedWallet = HDSegwitElectrumSeedP2WPKHWallet.fromJson(key);
break;
case MultisigHDWallet.type:
unserializedWallet = MultisigHDWallet.fromJson(key);
break;
case HDAezeedWallet.type:
unserializedWallet = HDAezeedWallet.fromJson(key);
// migrate password to this.passphrase field
// remove this code somewhere in year 2022
if (unserializedWallet.secret.includes(':')) {
const [mnemonic, passphrase] = unserializedWallet.secret.split(':');
unserializedWallet.secret = mnemonic;
unserializedWallet.passphrase = passphrase;
}
break;
case LightningLdkWallet.type:
unserializedWallet = LightningLdkWallet.fromJson(key);
break;
case SLIP39SegwitP2SHWallet.type:
unserializedWallet = SLIP39SegwitP2SHWallet.fromJson(key);
break;
case SLIP39LegacyP2PKHWallet.type:
unserializedWallet = SLIP39LegacyP2PKHWallet.fromJson(key);
break;
case SLIP39SegwitBech32Wallet.type:
unserializedWallet = SLIP39SegwitBech32Wallet.fromJson(key);
break;
case LightningCustodianWallet.type: {
/** @type {LightningCustodianWallet} */
unserializedWallet = LightningCustodianWallet.fromJson(key);
let lndhub = false;
try {
lndhub = await AsyncStorage.getItem(AppStorage.LNDHUB);
} catch (Error) {
console.warn(Error);
}
if (unserializedWallet.baseURI) {
unserializedWallet.setBaseURI(unserializedWallet.baseURI); // not really necessary, just for the sake of readability
console.log('using saved uri for for ln wallet:', unserializedWallet.baseURI);
} else if (lndhub) {
console.log('using wallet-wide settings ', lndhub, 'for ln wallet');
unserializedWallet.setBaseURI(lndhub);
} else {
console.log('wallet does not have a baseURI. Continuing init...');
}
unserializedWallet.init();
break;
}
case LegacyWallet.type:
default:
unserializedWallet = LegacyWallet.fromJson(key);
break;
}
try {
if (realm) this.inflateWalletFromRealm(realm, unserializedWallet);
} catch (error) {
alert(error.message);
}
// done
const ID = unserializedWallet.getID();
if (!this.wallets.some(wallet => wallet.getID() === ID)) {
this.wallets.push(unserializedWallet);
this.tx_metadata = data.tx_metadata;
}
}
if (realm) realm.close();
return true;
} else {
return false; // failed loading data or loading/decryptin data
}
}
/**
* Lookup wallet in list by it's secret and
* remove it from `this.wallets`
*
* @param wallet {AbstractWallet}
*/
deleteWallet = wallet => {
const ID = wallet.getID();
const tempWallets = [];
if (wallet.type === LightningLdkWallet.type) {
/** @type {LightningLdkWallet} */
const ldkwallet = wallet;
ldkwallet.stop().then(ldkwallet.purgeLocalStorage).catch(alert);
}
for (const value of this.wallets) {
if (value.getID() === ID) {
// the one we should delete
// nop
} else {
// the one we must keep
tempWallets.push(value);
}
}
this.wallets = tempWallets;
};
inflateWalletFromRealm(realm, walletToInflate) {
const transactions = realm.objects('WalletTransactions');
const transactionsForWallet = transactions.filtered(`walletid = "${walletToInflate.getID()}"`);
for (const tx of transactionsForWallet) {
if (tx.internal === false) {
if (walletToInflate._hdWalletInstance) {
walletToInflate._hdWalletInstance._txs_by_external_index[tx.index] =
walletToInflate._hdWalletInstance._txs_by_external_index[tx.index] || [];
walletToInflate._hdWalletInstance._txs_by_external_index[tx.index].push(JSON.parse(tx.tx));
} else {
walletToInflate._txs_by_external_index[tx.index] = walletToInflate._txs_by_external_index[tx.index] || [];
walletToInflate._txs_by_external_index[tx.index].push(JSON.parse(tx.tx));
}
} else if (tx.internal === true) {
if (walletToInflate._hdWalletInstance) {
walletToInflate._hdWalletInstance._txs_by_internal_index[tx.index] =
walletToInflate._hdWalletInstance._txs_by_internal_index[tx.index] || [];
walletToInflate._hdWalletInstance._txs_by_internal_index[tx.index].push(JSON.parse(tx.tx));
} else {
walletToInflate._txs_by_internal_index[tx.index] = walletToInflate._txs_by_internal_index[tx.index] || [];
walletToInflate._txs_by_internal_index[tx.index].push(JSON.parse(tx.tx));
}
} else {
if (!Array.isArray(walletToInflate._txs_by_external_index)) walletToInflate._txs_by_external_index = [];
walletToInflate._txs_by_external_index = walletToInflate._txs_by_external_index || [];
walletToInflate._txs_by_external_index.push(JSON.parse(tx.tx));
}
}
}
offloadWalletToRealm(realm, wallet) {
const id = wallet.getID();
const walletToSave = wallet._hdWalletInstance ?? wallet;
if (Array.isArray(walletToSave._txs_by_external_index)) {
// if this var is an array that means its a single-address wallet class, and this var is a flat array
// with transactions
realm.write(() => {
// cleanup all existing transactions for the wallet first
const walletTransactionsToDelete = realm.objects('WalletTransactions').filtered(`walletid = '${id}'`);
realm.delete(walletTransactionsToDelete);
for (const tx of walletToSave._txs_by_external_index) {
realm.create(
'WalletTransactions',
{
walletid: id,
tx: JSON.stringify(tx),
},
Realm.UpdateMode.Modified,
);
}
});
return;
}
/// ########################################################################################################
if (walletToSave._txs_by_external_index) {
realm.write(() => {
// cleanup all existing transactions for the wallet first
const walletTransactionsToDelete = realm.objects('WalletTransactions').filtered(`walletid = '${id}'`);
realm.delete(walletTransactionsToDelete);
// insert new ones:
for (const index of Object.keys(walletToSave._txs_by_external_index)) {
const txs = walletToSave._txs_by_external_index[index];
for (const tx of txs) {
realm.create(
'WalletTransactions',
{
walletid: id,
internal: false,
index: parseInt(index),
tx: JSON.stringify(tx),
},
Realm.UpdateMode.Modified,
);
}
}
for (const index of Object.keys(walletToSave._txs_by_internal_index)) {
const txs = walletToSave._txs_by_internal_index[index];
for (const tx of txs) {
realm.create(
'WalletTransactions',
{
walletid: id,
internal: true,
index: parseInt(index),
tx: JSON.stringify(tx),
},
Realm.UpdateMode.Modified,
);
}
}
});
}
}
/**
* Serializes and saves to storage object data.
* If cached password is saved - finds the correct bucket
* to save to, encrypts and then saves.
*
* @returns {Promise} Result of storage save
*/
async saveToDisk() {
if (savingInProgress) {
console.warn('saveToDisk is in progress');
if (++savingInProgress > 10) alert('Critical error. Last actions were not saved'); // should never happen
await new Promise(resolve => setTimeout(resolve, 1000 * savingInProgress)); // sleep
return this.saveToDisk();
}
savingInProgress = 1;
try {
const walletsToSave = [];
let realm;
try {
realm = await this.getRealm();
} catch (error) {
alert(error.message);
}
for (const key of this.wallets) {
if (typeof key === 'boolean') continue;
key.prepareForSerialization();
delete key.current;
const keyCloned = Object.assign({}, key); // stripped-down version of a wallet to save to secure keystore
if (key._hdWalletInstance) keyCloned._hdWalletInstance = Object.assign({}, key._hdWalletInstance);
if (realm) this.offloadWalletToRealm(realm, key);
// stripping down:
if (key._txs_by_external_index) {
keyCloned._txs_by_external_index = {};
keyCloned._txs_by_internal_index = {};
}
if (key._hdWalletInstance) {
keyCloned._hdWalletInstance._txs_by_external_index = {};
keyCloned._hdWalletInstance._txs_by_internal_index = {};
}
if (keyCloned._bip47_instance) {
delete keyCloned._bip47_instance; // since it wont be restored into a proper class instance
}
walletsToSave.push(JSON.stringify({ ...keyCloned, type: keyCloned.type }));
}
if (realm) realm.close();
let data = {
wallets: walletsToSave,
tx_metadata: this.tx_metadata,
};
if (this.cachedPassword) {
// should find the correct bucket, encrypt and then save
let buckets = await this.getItemWithFallbackToRealm('data');
buckets = JSON.parse(buckets);
const newData = [];
let num = 0;
for (const bucket of buckets) {
let decrypted;
// if we had `usedBucketNum` during loadFromDisk(), no point to try to decode each bucket to find the one we
// need, we just to find bucket with the same index
if (usedBucketNum !== false) {
if (num === usedBucketNum) {
decrypted = true;
}
num++;
} else {
// we dont have `usedBucketNum` for whatever reason, so lets try to decrypt each bucket after bucket
// till we find the right one
decrypted = encryption.decrypt(bucket, this.cachedPassword);
}
if (!decrypted) {
// no luck decrypting, its not our bucket
newData.push(bucket);
} else {
// decrypted ok, this is our bucket
// we serialize our object's data, encrypt it, and add it to buckets
newData.push(encryption.encrypt(JSON.stringify(data), this.cachedPassword));
}
}
data = newData;
}
await this.setItem('data', JSON.stringify(data));
await this.setItem(AppStorage.FLAG_ENCRYPTED, this.cachedPassword ? '1' : '');
// now, backing up same data in realm:
const realmkeyValue = await this.openRealmKeyValue();
this.saveToRealmKeyValue(realmkeyValue, 'data', JSON.stringify(data));
this.saveToRealmKeyValue(realmkeyValue, AppStorage.FLAG_ENCRYPTED, this.cachedPassword ? '1' : '');
realmkeyValue.close();
} catch (error) {
console.error('save to disk exception:', error.message);
alert('save to disk exception: ' + error.message);
if (error.message.includes('Realm file decryption failed')) {
console.warn('purging realm key-value database file');
this.purgeRealmKeyValueFile();
}
} finally {
savingInProgress = 0;
}
}
/**
* For each wallet, fetches balance from remote endpoint.
* Use getter for a specific wallet to get actual balance.
* Returns void.
* If index is present then fetch only from this specific wallet
*
* @return {Promise.<void>}
*/
fetchWalletBalances = async index => {
console.log('fetchWalletBalances for wallet#', typeof index === 'undefined' ? '(all)' : index);
if (index || index === 0) {
let c = 0;
for (const wallet of this.wallets) {
if (c++ === index) {
await wallet.fetchBalance();
}
}
} else {
for (const wallet of this.wallets) {
console.log('fetching balance for', wallet.getLabel());
await wallet.fetchBalance();
}
}
};
/**
* Fetches from remote endpoint all transactions for each wallet.
* Returns void.
* To access transactions - get them from each respective wallet.
* If index is present then fetch only from this specific wallet.
*
* @param index {Integer} Index of the wallet in this.wallets array,
* blank to fetch from all wallets
* @return {Promise.<void>}
*/
fetchWalletTransactions = async index => {
console.log('fetchWalletTransactions for wallet#', typeof index === 'undefined' ? '(all)' : index);
if (index || index === 0) {
let c = 0;
for (const wallet of this.wallets) {
if (c++ === index) {
await wallet.fetchTransactions();
if (wallet.fetchPendingTransactions) {
await wallet.fetchPendingTransactions();
}
if (wallet.fetchUserInvoices) {
await wallet.fetchUserInvoices();
}
}
}
} else {
for (const wallet of this.wallets) {
await wallet.fetchTransactions();
if (wallet.fetchPendingTransactions) {
await wallet.fetchPendingTransactions();
}
if (wallet.fetchUserInvoices) {
await wallet.fetchUserInvoices();
}
}
}
};
fetchSenderPaymentCodes = async index => {
console.log('fetchSenderPaymentCodes for wallet#', typeof index === 'undefined' ? '(all)' : index);
if (index || index === 0) {
try {
if (!(this.wallets[index].allowBIP47() && this.wallets[index].isBIP47Enabled())) return;
await this.wallets[index].fetchBIP47SenderPaymentCodes();
} catch (error) {
console.error('Failed to fetch sender payment codes for wallet', index, error);
}
} else {
for (const wallet of this.wallets) {
try {
if (!(wallet.allowBIP47() && wallet.isBIP47Enabled())) continue;
await wallet.fetchBIP47SenderPaymentCodes();
} catch (error) {
console.error('Failed to fetch sender payment codes for wallet', wallet.label, error);
}
}
}
};
/**
*
* @returns {Array.<AbstractWallet>}
*/
getWallets = () => {
return this.wallets;
};
/**
* Getter for all transactions in all wallets.
* But if index is provided - only for wallet with corresponding index
*
* @param index {Integer|null} Wallet index in this.wallets. Empty (or null) for all wallets.
* @param limit {Integer} How many txs return, starting from the earliest. Default: all of them.
* @param includeWalletsWithHideTransactionsEnabled {Boolean} Wallets' _hideTransactionsInWalletsList property determines wether the user wants this wallet's txs hidden from the main list view.
* @return {Array}
*/
getTransactions = (index, limit = Infinity, includeWalletsWithHideTransactionsEnabled = false) => {
if (index || index === 0) {
let txs = [];
let c = 0;
for (const wallet of this.wallets) {
if (c++ === index) {
txs = txs.concat(wallet.getTransactions());
}
}
return txs;
}
let txs = [];
for (const wallet of this.wallets.filter(w => includeWalletsWithHideTransactionsEnabled || !w.getHideTransactionsInWalletsList())) {
const walletTransactions = wallet.getTransactions();
const walletID = wallet.getID();
for (const t of walletTransactions) {
t.walletPreferredBalanceUnit = wallet.getPreferredBalanceUnit();
t.walletID = walletID;
}
txs = txs.concat(walletTransactions);
}
for (const t of txs) {
t.sort_ts = +new Date(t.received);
}
return txs
.sort(function (a, b) {
return b.sort_ts - a.sort_ts;
})
.slice(0, limit);
};
/**
* Getter for a sum of all balances of all wallets
*
* @return {number}
*/
getBalance = () => {
let finalBalance = 0;
for (const wal of this.wallets) {
finalBalance += wal.getBalance();
}
return finalBalance;
};
isAdvancedModeEnabled = async () => {
try {
return !!(await AsyncStorage.getItem(AppStorage.ADVANCED_MODE_ENABLED));
} catch (_) {}
return false;
};
setIsAdvancedModeEnabled = async value => {
await AsyncStorage.setItem(AppStorage.ADVANCED_MODE_ENABLED, value ? '1' : '');
};
isHandoffEnabled = async () => {
try {
return !!(await AsyncStorage.getItem(AppStorage.HANDOFF_STORAGE_KEY));
} catch (_) {}
return false;
};
setIsHandoffEnabled = async value => {
await AsyncStorage.setItem(AppStorage.HANDOFF_STORAGE_KEY, value ? '1' : '');
};
isDoNotTrackEnabled = async () => {
try {
return !!(await AsyncStorage.getItem(AppStorage.DO_NOT_TRACK));
} catch (_) {}
return false;
};
setDoNotTrack = async value => {
await AsyncStorage.setItem(AppStorage.DO_NOT_TRACK, value ? '1' : '');
};
/**
* Simple async sleeper function
*
* @param ms {number} Milliseconds to sleep
* @returns {Promise<Promise<*> | Promise<*>>}
*/
sleep = ms => {
return new Promise(resolve => setTimeout(resolve, ms));
};
purgeRealmKeyValueFile() {
const path = 'keyvalue.realm';
return Realm.deleteFile({
path,
});
}
}