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/*
 This file is part of web3.js.

web3.js is free software: you can redistribute it and/or modify
 it under the terms of the GNU Lesser General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.

web3.js is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License
 along with web3.js.  If not, see <http://www.gnu.org/licenses/>.
 */
/**
 * @file accounts.js
 * @author Fabian Vogelsteller <fabian@ethereum.org>
 * @date 2017
 */
'use strict';
var core = require('web3-core');
var Method = require('web3-core-method');
var Account = require('eth-lib/lib/account');
var cryp = (typeof global === 'undefined') ? require('crypto-browserify') : require('crypto');
var scrypt = require('scrypt-js');
var uuid = require('uuid');
var utils = require('web3-utils');
var helpers = require('web3-core-helpers');
var { TransactionFactory } = require('@ethereumjs/tx');
var Common = require('@ethereumjs/common').default;
var HardForks = require('@ethereumjs/common').Hardfork;
var ethereumjsUtil = require('ethereumjs-util');
var isNot = function (value) {
    return (typeof value === 'undefined') || value === null;
};
var isExist = function (value) {
    return (typeof value !== 'undefined') && value !== null;
};
var Accounts = function Accounts() {
    var _this = this;
    // sets _requestmanager
    core.packageInit(this, arguments);
    // remove unecessary core functions
    delete this.BatchRequest;
    delete this.extend;
    var _ethereumCall = [
        new Method({
            name: 'getNetworkId',
            call: 'net_version',
            params: 0,
            outputFormatter: parseInt
        }),
        new Method({
            name: 'getChainId',
            call: 'eth_chainId',
            params: 0,
            outputFormatter: utils.hexToNumber
        }),
        new Method({
            name: 'getGasPrice',
            call: 'eth_gasPrice',
            params: 0
        }),
        new Method({
            name: 'getTransactionCount',
            call: 'eth_getTransactionCount',
            params: 2,
            inputFormatter: [function (address) {
                    if (utils.isAddress(address)) {
                        return address;
                    }
                    else {
                        throw new Error('Address ' + address + ' is not a valid address to get the "transactionCount".');
                    }
                }, function () {
                    return 'latest';
                }]
        }),
        new Method({
            name: 'getBlockByNumber',
            call: 'eth_getBlockByNumber',
            params: 2,
            inputFormatter: [function (blockNumber) {
                    return blockNumber ? utils.toHex(blockNumber) : 'latest';
                }, function () {
                    return false;
                }]
        }),
    ];
    // attach methods to this._ethereumCall
    this._ethereumCall = {};
    _ethereumCall.forEach((method) => {
        method.attachToObject(_this._ethereumCall);
        method.setRequestManager(_this._requestManager);
    });
    this.wallet = new Wallet(this);
};
Accounts.prototype._addAccountFunctions = function (account) {
    var _this = this;
    // add sign functions
    account.signTransaction = function signTransaction(tx, callback) {
        return _this.signTransaction(tx, account.privateKey, callback);
    };
    account.sign = function sign(data) {
        return _this.sign(data, account.privateKey);
    };
    account.encrypt = function encrypt(password, options) {
        return _this.encrypt(account.privateKey, password, options);
    };
    return account;
};
Accounts.prototype.create = function create(entropy) {
    return this._addAccountFunctions(Account.create(entropy || utils.randomHex(32)));
};
Accounts.prototype.privateKeyToAccount = function privateKeyToAccount(privateKey, ignoreLength) {
    if (!privateKey.startsWith('0x')) {
        privateKey = '0x' + privateKey;
    }
    // 64 hex characters + hex-prefix
    if (!ignoreLength && privateKey.length !== 66) {
        throw new Error("Private key must be 32 bytes long");
    }
    return this._addAccountFunctions(Account.fromPrivate(privateKey));
};
Accounts.prototype.signTransaction = function signTransaction(tx, privateKey, callback) {
    var _this = this, error = false, transactionOptions = {}, hasTxSigningOptions = !!(tx && ((tx.chain && tx.hardfork) || tx.common));
    callback = callback || function () { };
    if (!tx) {
        error = new Error('No transaction object given!');
        callback(error);
        return Promise.reject(error);
    }
    if (isExist(tx.common) && isNot(tx.common.customChain)) {
        error = new Error('If tx.common is provided it must have tx.common.customChain');
        callback(error);
        return Promise.reject(error);
    }
    if (isExist(tx.common) && isNot(tx.common.customChain.chainId)) {
        error = new Error('If tx.common is provided it must have tx.common.customChain and tx.common.customChain.chainId');
        callback(error);
        return Promise.reject(error);
    }
    if (isExist(tx.common) && isExist(tx.common.customChain.chainId) && isExist(tx.chainId) && tx.chainId !== tx.common.customChain.chainId) {
        error = new Error('Chain Id doesnt match in tx.chainId tx.common.customChain.chainId');
        callback(error);
        return Promise.reject(error);
    }
    function signed(tx) {
        const error = _validateTransactionForSigning(tx);
        if (error) {
            callback(error);
            return Promise.reject(error);
        }
        try {
            var transaction = helpers.formatters.inputCallFormatter(Object.assign({}, tx));
            transaction.data = transaction.data || '0x';
            transaction.value = transaction.value || '0x';
            transaction.gasLimit = transaction.gasLimit || transaction.gas;
            if (transaction.type === '0x1' && transaction.accessList === undefined)
                transaction.accessList = [];
            // Because tx has no @ethereumjs/tx signing options we use fetched vals.
            if (!hasTxSigningOptions) {
                transactionOptions.common = Common.forCustomChain('mainnet', {
                    name: 'custom-network',
                    networkId: transaction.networkId,
                    chainId: transaction.chainId
                }, transaction.hardfork || HardForks.London);
                delete transaction.networkId;
            }
            else {
                if (transaction.common) {
                    transactionOptions.common = Common.forCustomChain(transaction.common.baseChain || 'mainnet', {
                        name: transaction.common.customChain.name || 'custom-network',
                        networkId: transaction.common.customChain.networkId,
                        chainId: transaction.common.customChain.chainId
                    }, transaction.common.hardfork || HardForks.London);
                    delete transaction.common;
                }
                if (transaction.chain) {
                    transactionOptions.chain = transaction.chain;
                    delete transaction.chain;
                }
                if (transaction.hardfork) {
                    transactionOptions.hardfork = transaction.hardfork;
                    delete transaction.hardfork;
                }
            }
            if (privateKey.startsWith('0x')) {
                privateKey = privateKey.substring(2);
            }
            var ethTx = TransactionFactory.fromTxData(transaction, transactionOptions);
            var signedTx = ethTx.sign(Buffer.from(privateKey, 'hex'));
            var validationErrors = signedTx.validate(true);
            if (validationErrors.length > 0) {
                let errorString = 'Signer Error: ';
                for (const validationError of validationErrors) {
                    errorString += `${errorString} ${validationError}.`;
                }
                throw new Error(errorString);
            }
            var rlpEncoded = signedTx.serialize().toString('hex');
            var rawTransaction = '0x' + rlpEncoded;
            var transactionHash = utils.keccak256(rawTransaction);
            var result = {
                messageHash: '0x' + Buffer.from(signedTx.getMessageToSign(true)).toString('hex'),
                v: '0x' + signedTx.v.toString('hex'),
                r: '0x' + signedTx.r.toString('hex'),
                s: '0x' + signedTx.s.toString('hex'),
                rawTransaction: rawTransaction,
                transactionHash: transactionHash
            };
            callback(null, result);
            return result;
        }
        catch (e) {
            callback(e);
            return Promise.reject(e);
        }
    }
    tx.type = _handleTxType(tx);
    // Resolve immediately if nonce, chainId, price and signing options are provided
    if (tx.nonce !== undefined &&
        tx.chainId !== undefined &&
        (tx.gasPrice !== undefined ||
            (tx.maxFeePerGas !== undefined &&
                tx.maxPriorityFeePerGas !== undefined)) &&
        hasTxSigningOptions) {
        return Promise.resolve(signed(tx));
    }
    // Otherwise, get the missing info from the Ethereum Node
    return Promise.all([
        ((isNot(tx.common) || isNot(tx.common.customChain.chainId)) ? //tx.common.customChain.chainId is not optional inside tx.common if tx.common is provided
            (isNot(tx.chainId) ? _this._ethereumCall.getChainId() : tx.chainId)
            : undefined),
        isNot(tx.nonce) ? _this._ethereumCall.getTransactionCount(_this.privateKeyToAccount(privateKey).address) : tx.nonce,
        isNot(hasTxSigningOptions) ? _this._ethereumCall.getNetworkId() : 1,
        _handleTxPricing(_this, tx)
    ]).then(function (args) {
        const [txchainId, txnonce, txnetworkId, txgasInfo] = args;
        if ((isNot(txchainId) && isNot(tx.common) && isNot(tx.common.customChain.chainId)) || isNot(txnonce) || isNot(txnetworkId) || isNot(txgasInfo)) {
            throw new Error('One of the values "chainId", "networkId", "gasPrice", or "nonce" couldn\'t be fetched: ' + JSON.stringify(args));
        }
        return signed({
            ...tx,
            ...((isNot(tx.common) || isNot(tx.common.customChain.chainId)) ? { chainId: txchainId } : {}),
            nonce: txnonce,
            networkId: txnetworkId,
            ...txgasInfo // Will either be gasPrice or maxFeePerGas and maxPriorityFeePerGas
        });
    });
};
function _validateTransactionForSigning(tx) {
    if (tx.common && (tx.chain && tx.hardfork)) {
        return new Error('Please provide the @ethereumjs/common object or the chain and hardfork property but not all together.');
    }
    if ((tx.chain && !tx.hardfork) || (tx.hardfork && !tx.chain)) {
        return new Error('When specifying chain and hardfork, both values must be defined. ' +
            'Received "chain": ' + tx.chain + ', "hardfork": ' + tx.hardfork);
    }
    if ((!tx.gas && !tx.gasLimit) &&
        (!tx.maxPriorityFeePerGas && !tx.maxFeePerGas)) {
        return new Error('"gas" is missing');
    }
    if (tx.gas && tx.gasPrice) {
        if (tx.gas < 0 || tx.gasPrice < 0) {
            return new Error('Gas or gasPrice is lower than 0');
        }
    }
    else {
        if (tx.maxPriorityFeePerGas < 0 || tx.maxFeePerGas < 0) {
            return new Error('maxPriorityFeePerGas or maxFeePerGas is lower than 0');
        }
    }
    if (tx.nonce < 0 || tx.chainId < 0) {
        return new Error('Nonce or chainId is lower than 0');
    }
    return;
}
function _handleTxType(tx) {
    // Taken from https://github.com/ethers-io/ethers.js/blob/2a7ce0e72a1e0c9469e10392b0329e75e341cf18/packages/abstract-signer/src.ts/index.ts#L215
    const hasEip1559 = (tx.maxFeePerGas !== undefined || tx.maxPriorityFeePerGas !== undefined);
    let txType;
    if (tx.type !== undefined) {
        txType = utils.toHex(tx.type);
    }
    else if (tx.type === undefined && hasEip1559) {
        txType = '0x2';
    }
    if (tx.gasPrice !== undefined && (txType === '0x2' || hasEip1559))
        throw Error("eip-1559 transactions don't support gasPrice");
    if ((txType === '0x1' || txType === '0x0') && hasEip1559)
        throw Error("pre-eip-1559 transaction don't support maxFeePerGas/maxPriorityFeePerGas");
    if (hasEip1559 ||
        ((tx.common && tx.common.hardfork && tx.common.hardfork.toLowerCase() === HardForks.London) ||
            (tx.hardfork && tx.hardfork.toLowerCase() === HardForks.London))) {
        txType = '0x2';
    }
    else if (tx.accessList ||
        ((tx.common && tx.common.hardfork && tx.common.hardfork.toLowerCase() === HardForks.Berlin) ||
            (tx.hardfork && tx.hardfork.toLowerCase() === HardForks.Berlin))) {
        txType = '0x1';
    }
    return txType;
}
function _handleTxPricing(_this, tx) {
    return new Promise((resolve, reject) => {
        try {
            if ((tx.type === undefined || tx.type < '0x2')
                && tx.gasPrice !== undefined) {
                // Legacy transaction, return provided gasPrice
                resolve({ gasPrice: tx.gasPrice });
            }
            else if (tx.type === '0x2' && tx.maxFeePerGas && tx.maxPriorityFeePerGas) {
                // EIP-1559 transaction, return provided maxFeePerGas and maxPriorityFeePerGas
                resolve({ maxFeePerGas: tx.maxFeePerGas, maxPriorityFeePerGas: tx.maxPriorityFeePerGas });
            }
            else {
                Promise.all([
                    _this._ethereumCall.getBlockByNumber(),
                    _this._ethereumCall.getGasPrice()
                ]).then(responses => {
                    const [block, gasPrice] = responses;
                    if ((tx.type === '0x2') &&
                        block && block.baseFeePerGas) {
                        // The network supports EIP-1559
                        // Taken from https://github.com/ethers-io/ethers.js/blob/ba6854bdd5a912fe873d5da494cb5c62c190adde/packages/abstract-provider/src.ts/index.ts#L230
                        let maxPriorityFeePerGas, maxFeePerGas;
                        if (tx.gasPrice) {
                            // Using legacy gasPrice property on an eip-1559 network,
                            // so use gasPrice as both fee properties
                            maxPriorityFeePerGas = tx.gasPrice;
                            maxFeePerGas = tx.gasPrice;
                            delete tx.gasPrice;
                        }
                        else {
                            maxPriorityFeePerGas = tx.maxPriorityFeePerGas || '0x9502F900'; // 2.5 Gwei
                            maxFeePerGas = tx.maxFeePerGas ||
                                utils.toHex(utils.toBN(block.baseFeePerGas)
                                    .mul(utils.toBN(2))
                                    .add(utils.toBN(maxPriorityFeePerGas)));
                        }
                        resolve({ maxFeePerGas, maxPriorityFeePerGas });
                    }
                    else {
                        if (tx.maxPriorityFeePerGas || tx.maxFeePerGas)
                            throw Error("Network doesn't support eip-1559");
                        resolve({ gasPrice });
                    }
                }).catch((error) => {
                    reject(error);
                });
            }
        }
        catch (error) {
            reject(error);
        }
    });
}
/* jshint ignore:start */
Accounts.prototype.recoverTransaction = function recoverTransaction(rawTx, txOptions = {}) {
    // Rely on EthereumJs/tx to determine the type of transaction
    const data = Buffer.from(rawTx.slice(2), "hex");
    const tx = TransactionFactory.fromSerializedData(data);
    //update checksum
    return utils.toChecksumAddress(tx.getSenderAddress().toString("hex"));
};
/* jshint ignore:end */
Accounts.prototype.hashMessage = function hashMessage(data) {
    var messageHex = utils.isHexStrict(data) ? data : utils.utf8ToHex(data);
    var messageBytes = utils.hexToBytes(messageHex);
    var messageBuffer = Buffer.from(messageBytes);
    var preamble = '\x19Ethereum Signed Message:\n' + messageBytes.length;
    var preambleBuffer = Buffer.from(preamble);
    var ethMessage = Buffer.concat([preambleBuffer, messageBuffer]);
    return ethereumjsUtil.bufferToHex(ethereumjsUtil.keccak256(ethMessage));
};
Accounts.prototype.sign = function sign(data, privateKey) {
    if (!privateKey.startsWith('0x')) {
        privateKey = '0x' + privateKey;
    }
    // 64 hex characters + hex-prefix
    if (privateKey.length !== 66) {
        throw new Error("Private key must be 32 bytes long");
    }
    var hash = this.hashMessage(data);
    var signature = Account.sign(hash, privateKey);
    var vrs = Account.decodeSignature(signature);
    return {
        message: data,
        messageHash: hash,
        v: vrs[0],
        r: vrs[1],
        s: vrs[2],
        signature: signature
    };
};
Accounts.prototype.recover = function recover(message, signature, preFixed) {
    var args = [].slice.apply(arguments);
    if (!!message && typeof message === 'object') {
        return this.recover(message.messageHash, Account.encodeSignature([message.v, message.r, message.s]), true);
    }
    if (!preFixed) {
        message = this.hashMessage(message);
    }
    if (args.length >= 4) {
        preFixed = args.slice(-1)[0];
        preFixed = typeof preFixed === 'boolean' ? !!preFixed : false;
        return this.recover(message, Account.encodeSignature(args.slice(1, 4)), preFixed); // v, r, s
    }
    return Account.recover(message, signature);
};
// Taken from https://github.com/ethereumjs/ethereumjs-wallet
Accounts.prototype.decrypt = function (v3Keystore, password, nonStrict) {
    /* jshint maxcomplexity: 10 */
    if (!(typeof password === 'string')) {
        throw new Error('No password given.');
    }
    var json = (!!v3Keystore && typeof v3Keystore === 'object') ? v3Keystore : JSON.parse(nonStrict ? v3Keystore.toLowerCase() : v3Keystore);
    if (json.version !== 3) {
        throw new Error('Not a valid V3 wallet');
    }
    var derivedKey;
    var kdfparams;
    if (json.crypto.kdf === 'scrypt') {
        kdfparams = json.crypto.kdfparams;
        // FIXME: support progress reporting callback
        derivedKey = scrypt.syncScrypt(Buffer.from(password), Buffer.from(kdfparams.salt, 'hex'), kdfparams.n, kdfparams.r, kdfparams.p, kdfparams.dklen);
    }
    else if (json.crypto.kdf === 'pbkdf2') {
        kdfparams = json.crypto.kdfparams;
        if (kdfparams.prf !== 'hmac-sha256') {
            throw new Error('Unsupported parameters to PBKDF2');
        }
        derivedKey = cryp.pbkdf2Sync(Buffer.from(password), Buffer.from(kdfparams.salt, 'hex'), kdfparams.c, kdfparams.dklen, 'sha256');
    }
    else {
        throw new Error('Unsupported key derivation scheme');
    }
    var ciphertext = Buffer.from(json.crypto.ciphertext, 'hex');
    var mac = utils.sha3(Buffer.from([...derivedKey.slice(16, 32), ...ciphertext])).replace('0x', '');
    if (mac !== json.crypto.mac) {
        throw new Error('Key derivation failed - possibly wrong password');
    }
    var decipher = cryp.createDecipheriv(json.crypto.cipher, derivedKey.slice(0, 16), Buffer.from(json.crypto.cipherparams.iv, 'hex'));
    var seed = '0x' + Buffer.from([...decipher.update(ciphertext), ...decipher.final()]).toString('hex');
    return this.privateKeyToAccount(seed, true);
};
Accounts.prototype.encrypt = function (privateKey, password, options) {
    /* jshint maxcomplexity: 20 */
    var account = this.privateKeyToAccount(privateKey, true);
    options = options || {};
    var salt = options.salt || cryp.randomBytes(32);
    var iv = options.iv || cryp.randomBytes(16);
    var derivedKey;
    var kdf = options.kdf || 'scrypt';
    var kdfparams = {
        dklen: options.dklen || 32,
        salt: salt.toString('hex')
    };
    if (kdf === 'pbkdf2') {
        kdfparams.c = options.c || 262144;
        kdfparams.prf = 'hmac-sha256';
        derivedKey = cryp.pbkdf2Sync(Buffer.from(password), Buffer.from(kdfparams.salt, 'hex'), kdfparams.c, kdfparams.dklen, 'sha256');
    }
    else if (kdf === 'scrypt') {
        // FIXME: support progress reporting callback
        kdfparams.n = options.n || 8192; // 2048 4096 8192 16384
        kdfparams.r = options.r || 8;
        kdfparams.p = options.p || 1;
        derivedKey = scrypt.syncScrypt(Buffer.from(password), Buffer.from(kdfparams.salt, 'hex'), kdfparams.n, kdfparams.r, kdfparams.p, kdfparams.dklen);
    }
    else {
        throw new Error('Unsupported kdf');
    }
    var cipher = cryp.createCipheriv(options.cipher || 'aes-128-ctr', derivedKey.slice(0, 16), iv);
    if (!cipher) {
        throw new Error('Unsupported cipher');
    }
    var ciphertext = Buffer.from([
        ...cipher.update(Buffer.from(account.privateKey.replace('0x', ''), 'hex')),
        ...cipher.final()
    ]);
    var mac = utils.sha3(Buffer.from([...derivedKey.slice(16, 32), ...ciphertext])).replace('0x', '');
    return {
        version: 3,
        id: uuid.v4({ random: options.uuid || cryp.randomBytes(16) }),
        address: account.address.toLowerCase().replace('0x', ''),
        crypto: {
            ciphertext: ciphertext.toString('hex'),
            cipherparams: {
                iv: iv.toString('hex')
            },
            cipher: options.cipher || 'aes-128-ctr',
            kdf: kdf,
            kdfparams: kdfparams,
            mac: mac.toString('hex')
        }
    };
};
// Note: this is trying to follow closely the specs on
// http://web3js.readthedocs.io/en/1.0/web3-eth-accounts.html
function Wallet(accounts) {
    this._accounts = accounts;
    this.length = 0;
    this.defaultKeyName = 'web3js_wallet';
}
Wallet.prototype._findSafeIndex = function (pointer) {
    pointer = pointer || 0;
    if (this.hasOwnProperty(pointer)) {
        return this._findSafeIndex(pointer + 1);
    }
    else {
        return pointer;
    }
};
Wallet.prototype._currentIndexes = function () {
    var keys = Object.keys(this);
    var indexes = keys
        .map(function (key) {
        return parseInt(key);
    })
        .filter(function (n) {
        return (n < 9e20);
    });
    return indexes;
};
Wallet.prototype.create = function (numberOfAccounts, entropy) {
    for (var i = 0; i < numberOfAccounts; ++i) {
        this.add(this._accounts.create(entropy).privateKey);
    }
    return this;
};
Wallet.prototype.add = function (account) {
    if (typeof account === 'string') {
        account = this._accounts.privateKeyToAccount(account);
    }
    if (!this[account.address]) {
        account = this._accounts.privateKeyToAccount(account.privateKey);
        account.index = this._findSafeIndex();
        this[account.index] = account;
        this[account.address] = account;
        this[account.address.toLowerCase()] = account;
        this.length++;
        return account;
    }
    else {
        return this[account.address];
    }
};
Wallet.prototype.remove = function (addressOrIndex) {
    var account = this[addressOrIndex];
    if (account && account.address) {
        // address
        this[account.address].privateKey = null;
        delete this[account.address];
        // address lowercase
        if (this[account.address.toLowerCase()]) {
            this[account.address.toLowerCase()].privateKey = null;
            delete this[account.address.toLowerCase()];
        }
        // index
        this[account.index].privateKey = null;
        delete this[account.index];
        this.length--;
        return true;
    }
    else {
        return false;
    }
};
Wallet.prototype.clear = function () {
    var _this = this;
    var indexes = this._currentIndexes();
    indexes.forEach(function (index) {
        _this.remove(index);
    });
    return this;
};
Wallet.prototype.encrypt = function (password, options) {
    var _this = this;
    var indexes = this._currentIndexes();
    var accounts = indexes.map(function (index) {
        return _this[index].encrypt(password, options);
    });
    return accounts;
};
Wallet.prototype.decrypt = function (encryptedWallet, password) {
    var _this = this;
    encryptedWallet.forEach(function (keystore) {
        var account = _this._accounts.decrypt(keystore, password);
        if (account) {
            _this.add(account);
        }
        else {
            throw new Error('Couldn\'t decrypt accounts. Password wrong?');
        }
    });
    return this;
};
Wallet.prototype.save = function (password, keyName) {
    localStorage.setItem(keyName || this.defaultKeyName, JSON.stringify(this.encrypt(password)));
    return true;
};
Wallet.prototype.load = function (password, keyName) {
    var keystore = localStorage.getItem(keyName || this.defaultKeyName);
    if (keystore) {
        try {
            keystore = JSON.parse(keystore);
        }
        catch (e) {
        }
    }
    return this.decrypt(keystore || [], password);
};
if (!storageAvailable('localStorage')) {
    delete Wallet.prototype.save;
    delete Wallet.prototype.load;
}
/**
 * Checks whether a storage type is available or not
 * For more info on how this works, please refer to MDN documentation
 * https://developer.mozilla.org/en-US/docs/Web/API/Web_Storage_API/Using_the_Web_Storage_API#Feature-detecting_localStorage
 *
 * @method storageAvailable
 * @param {String} type the type of storage ('localStorage', 'sessionStorage')
 * @returns {Boolean} a boolean indicating whether the specified storage is available or not
 */
function storageAvailable(type) {
    var storage;
    try {
        storage = self[type];
        var x = '__storage_test__';
        storage.setItem(x, x);
        storage.removeItem(x);
        return true;
    }
    catch (e) {
        return e && (
        // everything except Firefox
        e.code === 22 ||
            // Firefox
            e.code === 1014 ||
            // test name field too, because code might not be present
            // everything except Firefox
            e.name === 'QuotaExceededError' ||
            // Firefox
            e.name === 'NS_ERROR_DOM_QUOTA_REACHED') &&
            // acknowledge QuotaExceededError only if there's something already stored
            (storage && storage.length !== 0);
    }
}
module.exports = Accounts;

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