1225 lines
34 KiB
TypeScript
1225 lines
34 KiB
TypeScript
/*
|
|
This file is part of TALER
|
|
(C) 2015 GNUnet e.V.
|
|
|
|
TALER is free software; you can redistribute it and/or modify it under the
|
|
terms of the GNU General Public License as published by the Free Software
|
|
Foundation; either version 3, or (at your option) any later version.
|
|
|
|
TALER 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 General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License along with
|
|
TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
|
|
*/
|
|
|
|
/**
|
|
* High-level wallet operations that should be indepentent from the underlying
|
|
* browser extension interface.
|
|
* @module Wallet
|
|
* @author Florian Dold
|
|
*/
|
|
|
|
import {
|
|
AmountJson,
|
|
CreateReserveResponse,
|
|
IExchangeInfo,
|
|
Denomination,
|
|
Notifier,
|
|
WireInfo, RefreshSession, ReserveRecord
|
|
} from "./types";
|
|
import {HttpResponse, RequestException} from "./http";
|
|
import {QueryRoot} from "./query";
|
|
import {Checkable} from "./checkable";
|
|
import {canonicalizeBaseUrl} from "./helpers";
|
|
import {ReserveCreationInfo, Amounts} from "./types";
|
|
import {PreCoin} from "./types";
|
|
import {CryptoApi} from "./cryptoApi";
|
|
import {Coin} from "./types";
|
|
import {PayCoinInfo} from "./types";
|
|
import {CheckRepurchaseResult} from "./types";
|
|
import {Contract} from "./types";
|
|
import {ExchangeHandle} from "./types";
|
|
|
|
"use strict";
|
|
|
|
export interface CoinWithDenom {
|
|
coin: Coin;
|
|
denom: Denomination;
|
|
}
|
|
|
|
|
|
@Checkable.Class
|
|
export class KeysJson {
|
|
@Checkable.List(Checkable.Value(Denomination))
|
|
denoms: Denomination[];
|
|
|
|
@Checkable.String
|
|
master_public_key: string;
|
|
|
|
@Checkable.Any
|
|
auditors: any[];
|
|
|
|
@Checkable.String
|
|
list_issue_date: string;
|
|
|
|
@Checkable.Any
|
|
signkeys: any;
|
|
|
|
@Checkable.String
|
|
eddsa_pub: string;
|
|
|
|
@Checkable.String
|
|
eddsa_sig: string;
|
|
|
|
static checked: (obj: any) => KeysJson;
|
|
}
|
|
|
|
|
|
@Checkable.Class
|
|
export class CreateReserveRequest {
|
|
/**
|
|
* The initial amount for the reserve.
|
|
*/
|
|
@Checkable.Value(AmountJson)
|
|
amount: AmountJson;
|
|
|
|
/**
|
|
* Exchange URL where the bank should create the reserve.
|
|
*/
|
|
@Checkable.String
|
|
exchange: string;
|
|
|
|
static checked: (obj: any) => CreateReserveRequest;
|
|
}
|
|
|
|
|
|
@Checkable.Class
|
|
export class ConfirmReserveRequest {
|
|
/**
|
|
* Public key of then reserve that should be marked
|
|
* as confirmed.
|
|
*/
|
|
@Checkable.String
|
|
reservePub: string;
|
|
|
|
static checked: (obj: any) => ConfirmReserveRequest;
|
|
}
|
|
|
|
|
|
@Checkable.Class
|
|
export class Offer {
|
|
@Checkable.Value(Contract)
|
|
contract: Contract;
|
|
|
|
@Checkable.String
|
|
merchant_sig: string;
|
|
|
|
@Checkable.String
|
|
H_contract: string;
|
|
|
|
static checked: (obj: any) => Offer;
|
|
}
|
|
|
|
export interface HistoryRecord {
|
|
type: string;
|
|
timestamp: number;
|
|
subjectId?: string;
|
|
detail: any;
|
|
level: HistoryLevel;
|
|
}
|
|
|
|
|
|
interface ExchangeCoins {
|
|
[exchangeUrl: string]: CoinWithDenom[];
|
|
}
|
|
|
|
|
|
interface Transaction {
|
|
contractHash: string;
|
|
contract: Contract;
|
|
payReq: any;
|
|
merchantSig: string;
|
|
}
|
|
|
|
export enum HistoryLevel {
|
|
Trace = 1,
|
|
Developer = 2,
|
|
Expert = 3,
|
|
User = 4,
|
|
}
|
|
|
|
|
|
export interface Badge {
|
|
setText(s: string): void;
|
|
setColor(c: string): void;
|
|
startBusy(): void;
|
|
stopBusy(): void;
|
|
}
|
|
|
|
export function canonicalJson(obj: any): string {
|
|
// Check for cycles, etc.
|
|
JSON.stringify(obj);
|
|
if (typeof obj == "string" || typeof obj == "number" || obj === null) {
|
|
return JSON.stringify(obj)
|
|
}
|
|
if (Array.isArray(obj)) {
|
|
let objs: string[] = obj.map((e) => canonicalJson(e));
|
|
return `[${objs.join(',')}]`;
|
|
}
|
|
let keys: string[] = [];
|
|
for (let key in obj) {
|
|
keys.push(key);
|
|
}
|
|
keys.sort();
|
|
let s = "{";
|
|
for (let i = 0; i < keys.length; i++) {
|
|
let key = keys[i];
|
|
s += JSON.stringify(key) + ":" + canonicalJson(obj[key]);
|
|
if (i != keys.length - 1) {
|
|
s += ",";
|
|
}
|
|
}
|
|
return s + "}";
|
|
}
|
|
|
|
|
|
function deepEquals(x: any, y: any): boolean {
|
|
if (x === y) {
|
|
return true;
|
|
}
|
|
|
|
if (Array.isArray(x) && x.length !== y.length) {
|
|
return false;
|
|
}
|
|
|
|
var p = Object.keys(x);
|
|
return Object.keys(y).every((i) => p.indexOf(i) !== -1) &&
|
|
p.every((i) => deepEquals(x[i], y[i]));
|
|
}
|
|
|
|
|
|
function flatMap<T, U>(xs: T[], f: (x: T) => U[]): U[] {
|
|
return xs.reduce((acc: U[], next: T) => [...f(next), ...acc], []);
|
|
}
|
|
|
|
|
|
function getTalerStampSec(stamp: string): number | null {
|
|
const m = stamp.match(/\/?Date\(([0-9]*)\)\/?/);
|
|
if (!m) {
|
|
return null;
|
|
}
|
|
return parseInt(m[1]);
|
|
}
|
|
|
|
|
|
function setTimeout(f: any, t: number) {
|
|
return chrome.extension.getBackgroundPage().setTimeout(f, t);
|
|
}
|
|
|
|
|
|
function isWithdrawableDenom(d: Denomination) {
|
|
const now_sec = (new Date).getTime() / 1000;
|
|
const stamp_withdraw_sec = getTalerStampSec(d.stamp_expire_withdraw);
|
|
// Withdraw if still possible to withdraw within a minute
|
|
if (stamp_withdraw_sec + 60 > now_sec) {
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
|
|
interface HttpRequestLibrary {
|
|
req(method: string,
|
|
url: string | uri.URI,
|
|
options?: any): Promise<HttpResponse>;
|
|
|
|
get(url: string | uri.URI): Promise<HttpResponse>;
|
|
|
|
postJson(url: string | uri.URI, body: any): Promise<HttpResponse>;
|
|
|
|
postForm(url: string | uri.URI, form: any): Promise<HttpResponse>;
|
|
}
|
|
|
|
|
|
function copy(o: any) {
|
|
return JSON.parse(JSON.stringify(o));
|
|
}
|
|
|
|
/**
|
|
* Result of updating exisiting information
|
|
* about an exchange with a new '/keys' response.
|
|
*/
|
|
interface KeyUpdateInfo {
|
|
updatedExchangeInfo: IExchangeInfo;
|
|
addedDenominations: Denomination[];
|
|
removedDenominations: Denomination[];
|
|
}
|
|
|
|
|
|
/**
|
|
* Get a list of denominations (with repetitions possible)
|
|
* whose total value is as close as possible to the available
|
|
* amount, but never larger.
|
|
*/
|
|
function getWithdrawDenomList(amountAvailable: AmountJson,
|
|
denoms: Denomination[]): Denomination[] {
|
|
let remaining = Amounts.copy(amountAvailable);
|
|
const ds: Denomination[] = [];
|
|
|
|
denoms = denoms.filter(isWithdrawableDenom);
|
|
denoms.sort((d1, d2) => Amounts.cmp(d2.value, d1.value));
|
|
|
|
// This is an arbitrary number of coins
|
|
// we can withdraw in one go. It's not clear if this limit
|
|
// is useful ...
|
|
for (let i = 0; i < 1000; i++) {
|
|
let found = false;
|
|
for (let d of denoms) {
|
|
let cost = Amounts.add(d.value, d.fee_withdraw).amount;
|
|
if (Amounts.cmp(remaining, cost) < 0) {
|
|
continue;
|
|
}
|
|
found = true;
|
|
remaining = Amounts.sub(remaining, cost).amount;
|
|
ds.push(d);
|
|
break;
|
|
}
|
|
if (!found) {
|
|
break;
|
|
}
|
|
}
|
|
return ds;
|
|
}
|
|
|
|
|
|
export class Wallet {
|
|
private db: IDBDatabase;
|
|
private http: HttpRequestLibrary;
|
|
private badge: Badge;
|
|
private notifier: Notifier;
|
|
public cryptoApi: CryptoApi;
|
|
|
|
/**
|
|
* Set of identifiers for running operations.
|
|
*/
|
|
private runningOperations: Set<string> = new Set();
|
|
|
|
q(): QueryRoot {
|
|
return new QueryRoot(this.db);
|
|
}
|
|
|
|
constructor(db: IDBDatabase,
|
|
http: HttpRequestLibrary,
|
|
badge: Badge,
|
|
notifier: Notifier) {
|
|
this.db = db;
|
|
this.http = http;
|
|
this.badge = badge;
|
|
this.notifier = notifier;
|
|
this.cryptoApi = new CryptoApi();
|
|
|
|
this.resumePendingFromDb();
|
|
}
|
|
|
|
|
|
private startOperation(operationId: string) {
|
|
this.runningOperations.add(operationId);
|
|
this.badge.startBusy();
|
|
}
|
|
|
|
private stopOperation(operationId: string) {
|
|
this.runningOperations.delete(operationId);
|
|
if (this.runningOperations.size == 0) {
|
|
this.badge.stopBusy();
|
|
}
|
|
}
|
|
|
|
updateExchanges(): void {
|
|
console.log("updating exchanges");
|
|
|
|
this.q()
|
|
.iter("exchanges")
|
|
.reduce((exchange: IExchangeInfo) => {
|
|
this.updateExchangeFromUrl(exchange.baseUrl)
|
|
.catch((e) => {
|
|
console.error("updating exchange failed", e);
|
|
});
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Resume various pending operations that are pending
|
|
* by looking at the database.
|
|
*/
|
|
private resumePendingFromDb(): void {
|
|
console.log("resuming pending operations from db");
|
|
|
|
this.q()
|
|
.iter("reserves")
|
|
.reduce((reserve: any) => {
|
|
console.log("resuming reserve", reserve.reserve_pub);
|
|
this.processReserve(reserve);
|
|
});
|
|
|
|
this.q()
|
|
.iter("precoins")
|
|
.reduce((preCoin: any) => {
|
|
console.log("resuming precoin");
|
|
this.processPreCoin(preCoin);
|
|
});
|
|
}
|
|
|
|
|
|
/**
|
|
* Get exchanges and associated coins that are still spendable,
|
|
* but only if the sum the coins' remaining value exceeds the payment amount.
|
|
*/
|
|
private async getPossibleExchangeCoins(paymentAmount: AmountJson,
|
|
depositFeeLimit: AmountJson,
|
|
allowedExchanges: ExchangeHandle[]): Promise<ExchangeCoins> {
|
|
// Mapping from exchange base URL to list of coins together with their
|
|
// denomination
|
|
let m: ExchangeCoins = {};
|
|
|
|
let x: number;
|
|
|
|
function storeExchangeCoin(mc: any, url: string) {
|
|
let exchange: IExchangeInfo = mc[0];
|
|
console.log("got coin for exchange", url);
|
|
let coin: Coin = mc[1];
|
|
if (coin.suspended) {
|
|
console.log("skipping suspended coin",
|
|
coin.denomPub,
|
|
"from exchange",
|
|
exchange.baseUrl);
|
|
return;
|
|
}
|
|
let denom = exchange.active_denoms.find((e) => e.denom_pub === coin.denomPub);
|
|
if (!denom) {
|
|
console.warn("denom not found (database inconsistent)");
|
|
return;
|
|
}
|
|
if (denom.value.currency !== paymentAmount.currency) {
|
|
console.warn("same pubkey for different currencies");
|
|
return;
|
|
}
|
|
let cd = {coin, denom};
|
|
let x = m[url];
|
|
if (!x) {
|
|
m[url] = [cd];
|
|
} else {
|
|
x.push(cd);
|
|
}
|
|
}
|
|
|
|
// Make sure that we don't look up coins
|
|
// for the same URL twice ...
|
|
let handledExchanges = new Set();
|
|
|
|
let ps = flatMap(allowedExchanges, (info: ExchangeHandle) => {
|
|
if (handledExchanges.has(info.url)) {
|
|
return [];
|
|
}
|
|
handledExchanges.add(info.url);
|
|
console.log("Checking for merchant's exchange", JSON.stringify(info));
|
|
return [
|
|
this.q()
|
|
.iter("exchanges", {indexName: "pubKey", only: info.master_pub})
|
|
.indexJoin("coins",
|
|
"exchangeBaseUrl",
|
|
(exchange) => exchange.baseUrl)
|
|
.reduce((x) => storeExchangeCoin(x, info.url))
|
|
];
|
|
});
|
|
|
|
await Promise.all(ps);
|
|
|
|
let ret: ExchangeCoins = {};
|
|
|
|
if (Object.keys(m).length == 0) {
|
|
console.log("not suitable exchanges found");
|
|
}
|
|
|
|
console.dir(m);
|
|
|
|
// We try to find the first exchange where we have
|
|
// enough coins to cover the paymentAmount with fees
|
|
// under depositFeeLimit
|
|
|
|
nextExchange:
|
|
for (let key in m) {
|
|
let coins = m[key];
|
|
// Sort by ascending deposit fee
|
|
coins.sort((o1, o2) => Amounts.cmp(o1.denom.fee_deposit,
|
|
o2.denom.fee_deposit));
|
|
let maxFee = Amounts.copy(depositFeeLimit);
|
|
let minAmount = Amounts.copy(paymentAmount);
|
|
let accFee = Amounts.copy(coins[0].denom.fee_deposit);
|
|
let accAmount = Amounts.getZero(coins[0].coin.currentAmount.currency);
|
|
let usableCoins: CoinWithDenom[] = [];
|
|
nextCoin:
|
|
for (let i = 0; i < coins.length; i++) {
|
|
let coinAmount = Amounts.copy(coins[i].coin.currentAmount);
|
|
let coinFee = coins[i].denom.fee_deposit;
|
|
if (Amounts.cmp(coinAmount, coinFee) <= 0) {
|
|
continue nextCoin;
|
|
}
|
|
accFee = Amounts.add(accFee, coinFee).amount;
|
|
accAmount = Amounts.add(accAmount, coinAmount).amount;
|
|
if (Amounts.cmp(accFee, maxFee) >= 0) {
|
|
// FIXME: if the fees are too high, we have
|
|
// to cover them ourselves ....
|
|
console.log("too much fees");
|
|
continue nextExchange;
|
|
}
|
|
usableCoins.push(coins[i]);
|
|
if (Amounts.cmp(accAmount, minAmount) >= 0) {
|
|
ret[key] = usableCoins;
|
|
continue nextExchange;
|
|
}
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
|
|
/**
|
|
* Record all information that is necessary to
|
|
* pay for a contract in the wallet's database.
|
|
*/
|
|
private async recordConfirmPay(offer: Offer,
|
|
payCoinInfo: PayCoinInfo,
|
|
chosenExchange: string): Promise<void> {
|
|
let payReq: any = {};
|
|
payReq["amount"] = offer.contract.amount;
|
|
payReq["coins"] = payCoinInfo.map((x) => x.sig);
|
|
payReq["H_contract"] = offer.H_contract;
|
|
payReq["max_fee"] = offer.contract.max_fee;
|
|
payReq["merchant_sig"] = offer.merchant_sig;
|
|
payReq["exchange"] = URI(chosenExchange).href();
|
|
payReq["refund_deadline"] = offer.contract.refund_deadline;
|
|
payReq["timestamp"] = offer.contract.timestamp;
|
|
payReq["transaction_id"] = offer.contract.transaction_id;
|
|
let t: Transaction = {
|
|
contractHash: offer.H_contract,
|
|
contract: offer.contract,
|
|
payReq: payReq,
|
|
merchantSig: offer.merchant_sig,
|
|
};
|
|
|
|
let historyEntry = {
|
|
type: "pay",
|
|
timestamp: (new Date).getTime(),
|
|
subjectId: `contract-${offer.H_contract}`,
|
|
detail: {
|
|
merchantName: offer.contract.merchant.name,
|
|
amount: offer.contract.amount,
|
|
contractHash: offer.H_contract,
|
|
fulfillmentUrl: offer.contract.fulfillment_url,
|
|
}
|
|
};
|
|
|
|
await this.q()
|
|
.put("transactions", t)
|
|
.put("history", historyEntry)
|
|
.putAll("coins", payCoinInfo.map((pci) => pci.updatedCoin))
|
|
.finish();
|
|
|
|
this.notifier.notify();
|
|
}
|
|
|
|
|
|
async putHistory(historyEntry: HistoryRecord): Promise<void> {
|
|
await this.q().put("history", historyEntry).finish();
|
|
this.notifier.notify();
|
|
}
|
|
|
|
|
|
/**
|
|
* Add a contract to the wallet and sign coins,
|
|
* but do not send them yet.
|
|
*/
|
|
async confirmPay(offer: Offer): Promise<any> {
|
|
console.log("executing confirmPay");
|
|
|
|
let transaction = await this.q().get("transactions", offer.H_contract);
|
|
|
|
if (transaction) {
|
|
// Already payed ...
|
|
return {};
|
|
}
|
|
|
|
let mcs = await this.getPossibleExchangeCoins(offer.contract.amount,
|
|
offer.contract.max_fee,
|
|
offer.contract.exchanges);
|
|
|
|
if (Object.keys(mcs).length == 0) {
|
|
console.log("not confirming payment, insufficient coins");
|
|
return {
|
|
error: "coins-insufficient",
|
|
};
|
|
}
|
|
let exchangeUrl = Object.keys(mcs)[0];
|
|
|
|
let ds = await this.cryptoApi.signDeposit(offer, mcs[exchangeUrl]);
|
|
await this.recordConfirmPay(offer,
|
|
ds,
|
|
exchangeUrl);
|
|
return {};
|
|
}
|
|
|
|
|
|
/**
|
|
* Add a contract to the wallet and sign coins,
|
|
* but do not send them yet.
|
|
*/
|
|
async checkPay(offer: Offer): Promise<any> {
|
|
// First check if we already payed for it.
|
|
let transaction = await this.q().get("transactions", offer.H_contract);
|
|
if (transaction) {
|
|
return {isPayed: true};
|
|
}
|
|
|
|
// If not already payed, check if we could pay for it.
|
|
let mcs = await this.getPossibleExchangeCoins(offer.contract.amount,
|
|
offer.contract.max_fee,
|
|
offer.contract.exchanges);
|
|
|
|
if (Object.keys(mcs).length == 0) {
|
|
console.log("not confirming payment, insufficient coins");
|
|
return {
|
|
error: "coins-insufficient",
|
|
};
|
|
}
|
|
return {isPayed: false};
|
|
}
|
|
|
|
|
|
/**
|
|
* Retrieve all necessary information for looking up the contract
|
|
* with the given hash.
|
|
*/
|
|
async executePayment(H_contract: string): Promise<any> {
|
|
let t = await this.q().get<Transaction>("transactions", H_contract);
|
|
if (!t) {
|
|
return {
|
|
success: false,
|
|
contractFound: false,
|
|
}
|
|
}
|
|
let resp = {
|
|
success: true,
|
|
payReq: t.payReq,
|
|
contract: t.contract,
|
|
};
|
|
return resp;
|
|
}
|
|
|
|
|
|
/**
|
|
* First fetch information requred to withdraw from the reserve,
|
|
* then deplete the reserve, withdrawing coins until it is empty.
|
|
*/
|
|
private async processReserve(reserveRecord: ReserveRecord,
|
|
retryDelayMs: number = 250): Promise<void> {
|
|
const opId = "reserve-" + reserveRecord.reserve_pub;
|
|
this.startOperation(opId);
|
|
|
|
try {
|
|
let exchange = await this.updateExchangeFromUrl(reserveRecord.exchange_base_url);
|
|
let reserve = await this.updateReserve(reserveRecord.reserve_pub,
|
|
exchange);
|
|
let n = await this.depleteReserve(reserve, exchange);
|
|
|
|
if (n != 0) {
|
|
let depleted = {
|
|
type: "depleted-reserve",
|
|
subjectId: `reserve-progress-${reserveRecord.reserve_pub}`,
|
|
timestamp: (new Date).getTime(),
|
|
detail: {
|
|
exchangeBaseUrl: reserveRecord.exchange_base_url,
|
|
reservePub: reserveRecord.reserve_pub,
|
|
requestedAmount: reserveRecord.requested_amount,
|
|
currentAmount: reserveRecord.current_amount,
|
|
}
|
|
};
|
|
await this.q().put("history", depleted).finish();
|
|
}
|
|
} catch (e) {
|
|
// random, exponential backoff truncated at 3 minutes
|
|
let nextDelay = Math.min(2 * retryDelayMs + retryDelayMs * Math.random(),
|
|
3000 * 60);
|
|
console.warn(`Failed to deplete reserve, trying again in ${retryDelayMs} ms`);
|
|
setTimeout(() => this.processReserve(reserveRecord, nextDelay),
|
|
retryDelayMs);
|
|
} finally {
|
|
this.stopOperation(opId);
|
|
}
|
|
}
|
|
|
|
|
|
private async processPreCoin(preCoin: PreCoin,
|
|
retryDelayMs = 100): Promise<void> {
|
|
try {
|
|
const coin = await this.withdrawExecute(preCoin);
|
|
this.storeCoin(coin);
|
|
} catch (e) {
|
|
console.error("Failed to withdraw coin from precoin, retrying in",
|
|
retryDelayMs,
|
|
"ms", e);
|
|
// exponential backoff truncated at one minute
|
|
let nextRetryDelayMs = Math.min(retryDelayMs * 2, 1000 * 60);
|
|
setTimeout(() => this.processPreCoin(preCoin, nextRetryDelayMs),
|
|
retryDelayMs);
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Create a reserve, but do not flag it as confirmed yet.
|
|
*/
|
|
async createReserve(req: CreateReserveRequest): Promise<CreateReserveResponse> {
|
|
let keypair = await this.cryptoApi.createEddsaKeypair();
|
|
const now = (new Date).getTime();
|
|
const canonExchange = canonicalizeBaseUrl(req.exchange);
|
|
|
|
const reserveRecord: ReserveRecord = {
|
|
reserve_pub: keypair.pub,
|
|
reserve_priv: keypair.priv,
|
|
exchange_base_url: canonExchange,
|
|
created: now,
|
|
last_query: null,
|
|
current_amount: null,
|
|
requested_amount: req.amount,
|
|
confirmed: false,
|
|
withdrawn_amount: Amounts.getZero(req.amount.currency)
|
|
};
|
|
|
|
const historyEntry = {
|
|
type: "create-reserve",
|
|
level: HistoryLevel.Expert,
|
|
timestamp: now,
|
|
subjectId: `reserve-progress-${reserveRecord.reserve_pub}`,
|
|
detail: {
|
|
requestedAmount: req.amount,
|
|
reservePub: reserveRecord.reserve_pub,
|
|
}
|
|
};
|
|
|
|
await this.q()
|
|
.put("reserves", reserveRecord)
|
|
.put("history", historyEntry)
|
|
.finish();
|
|
|
|
let r: CreateReserveResponse = {
|
|
exchange: canonExchange,
|
|
reservePub: keypair.pub,
|
|
};
|
|
return r;
|
|
}
|
|
|
|
|
|
/**
|
|
* Mark an existing reserve as confirmed. The wallet will start trying
|
|
* to withdraw from that reserve. This may not immediately succeed,
|
|
* since the exchange might not know about the reserve yet, even though the
|
|
* bank confirmed its creation.
|
|
*
|
|
* A confirmed reserve should be shown to the user in the UI, while
|
|
* an unconfirmed reserve should be hidden.
|
|
*/
|
|
async confirmReserve(req: ConfirmReserveRequest): Promise<void> {
|
|
const now = (new Date).getTime();
|
|
let reserve: ReserveRecord|undefined = await (
|
|
this.q().get<ReserveRecord>("reserves",
|
|
req.reservePub));
|
|
if (!reserve) {
|
|
console.error("Unable to confirm reserve, not found in DB");
|
|
return;
|
|
}
|
|
const historyEntry = {
|
|
type: "confirm-reserve",
|
|
timestamp: now,
|
|
subjectId: `reserve-progress-${reserve.reserve_pub}`,
|
|
detail: {
|
|
exchangeBaseUrl: reserve.exchange_base_url,
|
|
reservePub: req.reservePub,
|
|
requestedAmount: reserve.requested_amount,
|
|
}
|
|
};
|
|
reserve.confirmed = true;
|
|
await this.q()
|
|
.put("reserves", reserve)
|
|
.put("history", historyEntry)
|
|
.finish();
|
|
|
|
this.processReserve(reserve);
|
|
}
|
|
|
|
|
|
private async withdrawExecute(pc: PreCoin): Promise<Coin> {
|
|
let reserve = await this.q().get<ReserveRecord>("reserves", pc.reservePub);
|
|
|
|
if (!reserve) {
|
|
throw Error("db inconsistent");
|
|
}
|
|
|
|
let wd: any = {};
|
|
wd.denom_pub = pc.denomPub;
|
|
wd.reserve_pub = pc.reservePub;
|
|
wd.reserve_sig = pc.withdrawSig;
|
|
wd.coin_ev = pc.coinEv;
|
|
let reqUrl = URI("reserve/withdraw").absoluteTo(reserve.exchange_base_url);
|
|
let resp = await this.http.postJson(reqUrl, wd);
|
|
|
|
|
|
if (resp.status != 200) {
|
|
throw new RequestException({
|
|
hint: "Withdrawal failed",
|
|
status: resp.status
|
|
});
|
|
}
|
|
let r = JSON.parse(resp.responseText);
|
|
let denomSig = await this.cryptoApi.rsaUnblind(r.ev_sig,
|
|
pc.blindingKey,
|
|
pc.denomPub);
|
|
let coin: Coin = {
|
|
coinPub: pc.coinPub,
|
|
coinPriv: pc.coinPriv,
|
|
denomPub: pc.denomPub,
|
|
denomSig: denomSig,
|
|
currentAmount: pc.coinValue,
|
|
exchangeBaseUrl: pc.exchangeBaseUrl,
|
|
};
|
|
return coin;
|
|
}
|
|
|
|
async storeCoin(coin: Coin): Promise<void> {
|
|
let historyEntry: HistoryRecord = {
|
|
type: "withdraw",
|
|
timestamp: (new Date).getTime(),
|
|
level: HistoryLevel.Expert,
|
|
detail: {
|
|
coinPub: coin.coinPub,
|
|
}
|
|
};
|
|
await this.q()
|
|
.delete("precoins", coin.coinPub)
|
|
.add("coins", coin)
|
|
.add("history", historyEntry)
|
|
.finish();
|
|
this.notifier.notify();
|
|
}
|
|
|
|
|
|
/**
|
|
* Withdraw one coin of the given denomination from the given reserve.
|
|
*/
|
|
private async withdraw(denom: Denomination,
|
|
reserve: ReserveRecord): Promise<void> {
|
|
console.log("creating pre coin at", new Date());
|
|
let preCoin = await this.cryptoApi
|
|
.createPreCoin(denom, reserve);
|
|
await this.q()
|
|
.put("precoins", preCoin)
|
|
.finish();
|
|
await this.processPreCoin(preCoin);
|
|
}
|
|
|
|
|
|
/**
|
|
* Withdraw coins from a reserve until it is empty.
|
|
*/
|
|
private async depleteReserve(reserve: any,
|
|
exchange: IExchangeInfo): Promise<number> {
|
|
let denomsAvailable: Denomination[] = copy(exchange.active_denoms);
|
|
let denomsForWithdraw = getWithdrawDenomList(reserve.current_amount,
|
|
denomsAvailable);
|
|
|
|
let ps = denomsForWithdraw.map((denom) => this.withdraw(denom, reserve));
|
|
await Promise.all(ps);
|
|
return ps.length;
|
|
}
|
|
|
|
|
|
/**
|
|
* Update the information about a reserve that is stored in the wallet
|
|
* by quering the reserve's exchange.
|
|
*/
|
|
private async updateReserve(reservePub: string,
|
|
exchange: IExchangeInfo): Promise<ReserveRecord> {
|
|
let reserve = await this.q()
|
|
.get<ReserveRecord>("reserves", reservePub);
|
|
if (!reserve) {
|
|
throw Error("reserve not in db");
|
|
}
|
|
let reqUrl = URI("reserve/status").absoluteTo(exchange.baseUrl);
|
|
reqUrl.query({'reserve_pub': reservePub});
|
|
let resp = await this.http.get(reqUrl);
|
|
if (resp.status != 200) {
|
|
throw Error();
|
|
}
|
|
let reserveInfo = JSON.parse(resp.responseText);
|
|
if (!reserveInfo) {
|
|
throw Error();
|
|
}
|
|
let oldAmount = reserve.current_amount;
|
|
let newAmount = reserveInfo.balance;
|
|
reserve.current_amount = reserveInfo.balance;
|
|
let historyEntry = {
|
|
type: "reserve-update",
|
|
timestamp: (new Date).getTime(),
|
|
subjectId: `reserve-progress-${reserve.reserve_pub}`,
|
|
detail: {
|
|
reservePub,
|
|
requestedAmount: reserve.requested_amount,
|
|
oldAmount,
|
|
newAmount
|
|
}
|
|
};
|
|
await this.q()
|
|
.put("reserves", reserve)
|
|
.finish();
|
|
return reserve;
|
|
}
|
|
|
|
|
|
/**
|
|
* Get the wire information for the exchange with the given base URL.
|
|
*/
|
|
async getWireInfo(exchangeBaseUrl: string): Promise<WireInfo> {
|
|
exchangeBaseUrl = canonicalizeBaseUrl(exchangeBaseUrl);
|
|
let reqUrl = URI("wire").absoluteTo(exchangeBaseUrl);
|
|
let resp = await this.http.get(reqUrl);
|
|
|
|
if (resp.status != 200) {
|
|
throw Error("/wire request failed");
|
|
}
|
|
|
|
let wiJson = JSON.parse(resp.responseText);
|
|
if (!wiJson) {
|
|
throw Error("/wire response malformed")
|
|
}
|
|
return wiJson;
|
|
}
|
|
|
|
async getReserveCreationInfo(baseUrl: string,
|
|
amount: AmountJson): Promise<ReserveCreationInfo> {
|
|
let exchangeInfo = await this.updateExchangeFromUrl(baseUrl);
|
|
|
|
let selectedDenoms = getWithdrawDenomList(amount,
|
|
exchangeInfo.active_denoms);
|
|
let acc = Amounts.getZero(amount.currency);
|
|
for (let d of selectedDenoms) {
|
|
acc = Amounts.add(acc, d.fee_withdraw).amount;
|
|
}
|
|
let actualCoinCost = selectedDenoms
|
|
.map((d: Denomination) => Amounts.add(d.value,
|
|
d.fee_withdraw).amount)
|
|
.reduce((a, b) => Amounts.add(a, b).amount);
|
|
|
|
let wireInfo = await this.getWireInfo(baseUrl);
|
|
|
|
let ret: ReserveCreationInfo = {
|
|
exchangeInfo,
|
|
selectedDenoms,
|
|
wireInfo,
|
|
withdrawFee: acc,
|
|
overhead: Amounts.sub(amount, actualCoinCost).amount,
|
|
};
|
|
return ret;
|
|
}
|
|
|
|
|
|
/**
|
|
* Update or add exchange DB entry by fetching the /keys information.
|
|
* Optionally link the reserve entry to the new or existing
|
|
* exchange entry in then DB.
|
|
*/
|
|
async updateExchangeFromUrl(baseUrl: string): Promise<IExchangeInfo> {
|
|
baseUrl = canonicalizeBaseUrl(baseUrl);
|
|
let reqUrl = URI("keys").absoluteTo(baseUrl);
|
|
let resp = await this.http.get(reqUrl);
|
|
if (resp.status != 200) {
|
|
throw Error("/keys request failed");
|
|
}
|
|
let exchangeKeysJson = KeysJson.checked(JSON.parse(resp.responseText));
|
|
return this.updateExchangeFromJson(baseUrl, exchangeKeysJson);
|
|
}
|
|
|
|
private async suspendCoins(exchangeInfo: IExchangeInfo): Promise<void> {
|
|
let suspendedCoins = await (
|
|
this.q()
|
|
.iter("coins",
|
|
{indexName: "exchangeBaseUrl", only: exchangeInfo.baseUrl})
|
|
.reduce((coin: Coin, suspendedCoins: Coin[]) => {
|
|
if (!exchangeInfo.active_denoms.find((c) => c.denom_pub == coin.denomPub)) {
|
|
return Array.prototype.concat(suspendedCoins, [coin]);
|
|
}
|
|
return Array.prototype.concat(suspendedCoins);
|
|
}, []));
|
|
|
|
let q = this.q();
|
|
suspendedCoins.map((c) => {
|
|
console.log("suspending coin", c);
|
|
c.suspended = true;
|
|
q.put("coins", c);
|
|
});
|
|
await q.finish();
|
|
}
|
|
|
|
|
|
private async updateExchangeFromJson(baseUrl: string,
|
|
exchangeKeysJson: KeysJson): Promise<IExchangeInfo> {
|
|
const updateTimeSec = getTalerStampSec(exchangeKeysJson.list_issue_date);
|
|
if (updateTimeSec === null) {
|
|
throw Error("invalid update time");
|
|
}
|
|
|
|
let r = await this.q().get<IExchangeInfo>("exchanges", baseUrl);
|
|
|
|
let exchangeInfo: IExchangeInfo;
|
|
|
|
if (!r) {
|
|
exchangeInfo = {
|
|
baseUrl,
|
|
all_denoms: [],
|
|
active_denoms: [],
|
|
last_update_time: updateTimeSec,
|
|
masterPublicKey: exchangeKeysJson.master_public_key,
|
|
};
|
|
console.log("making fresh exchange");
|
|
} else {
|
|
if (updateTimeSec < r.last_update_time) {
|
|
console.log("outdated /keys, not updating");
|
|
return r
|
|
}
|
|
exchangeInfo = r;
|
|
console.log("updating old exchange");
|
|
}
|
|
|
|
let updatedExchangeInfo = await this.updateExchangeInfo(exchangeInfo,
|
|
exchangeKeysJson);
|
|
await this.suspendCoins(updatedExchangeInfo);
|
|
|
|
await this.q()
|
|
.put("exchanges", updatedExchangeInfo)
|
|
.finish();
|
|
|
|
return updatedExchangeInfo;
|
|
}
|
|
|
|
|
|
private async updateExchangeInfo(exchangeInfo: IExchangeInfo,
|
|
newKeys: KeysJson): Promise<IExchangeInfo> {
|
|
if (exchangeInfo.masterPublicKey != newKeys.master_public_key) {
|
|
throw Error("public keys do not match");
|
|
}
|
|
|
|
exchangeInfo.active_denoms = [];
|
|
|
|
let denomsToCheck = newKeys.denoms.filter((newDenom) => {
|
|
// did we find the new denom in the list of all (old) denoms?
|
|
let found = false;
|
|
for (let oldDenom of exchangeInfo.all_denoms) {
|
|
if (oldDenom.denom_pub === newDenom.denom_pub) {
|
|
let a: any = Object.assign({}, oldDenom);
|
|
let b: any = Object.assign({}, newDenom);
|
|
// pub hash is only there for convenience in the wallet
|
|
delete a["pub_hash"];
|
|
delete b["pub_hash"];
|
|
if (!deepEquals(a, b)) {
|
|
console.error("denomination parameters were modified, old/new:");
|
|
console.dir(a);
|
|
console.dir(b);
|
|
// FIXME: report to auditors
|
|
}
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (found) {
|
|
exchangeInfo.active_denoms.push(newDenom);
|
|
// No need to check signatures
|
|
return false;
|
|
}
|
|
return true;
|
|
});
|
|
|
|
let ps = denomsToCheck.map(async(denom) => {
|
|
let valid = await this.cryptoApi
|
|
.isValidDenom(denom,
|
|
exchangeInfo.masterPublicKey);
|
|
if (!valid) {
|
|
console.error("invalid denomination",
|
|
denom,
|
|
"with key",
|
|
exchangeInfo.masterPublicKey);
|
|
// FIXME: report to auditors
|
|
}
|
|
exchangeInfo.active_denoms.push(denom);
|
|
exchangeInfo.all_denoms.push(denom);
|
|
});
|
|
|
|
await Promise.all(ps);
|
|
|
|
return exchangeInfo;
|
|
}
|
|
|
|
|
|
/**
|
|
* Retrieve a mapping from currency name to the amount
|
|
* that is currenctly available for spending in the wallet.
|
|
*/
|
|
async getBalances(): Promise<any> {
|
|
function collectBalances(c: Coin, byCurrency: any) {
|
|
if (c.suspended) {
|
|
return byCurrency;
|
|
}
|
|
let acc: AmountJson = byCurrency[c.currentAmount.currency];
|
|
if (!acc) {
|
|
acc = Amounts.getZero(c.currentAmount.currency);
|
|
}
|
|
byCurrency[c.currentAmount.currency] = Amounts.add(c.currentAmount,
|
|
acc).amount;
|
|
return byCurrency;
|
|
}
|
|
|
|
let byCurrency = await (
|
|
this.q()
|
|
.iter("coins")
|
|
.reduce(collectBalances, {}));
|
|
|
|
return {balances: byCurrency};
|
|
}
|
|
|
|
|
|
async refresh(oldCoinPub: string): Promise<void> {
|
|
// FIXME: this is not running in a transaction.
|
|
|
|
let coin = await this.q().get<Coin>("coins", oldCoinPub);
|
|
|
|
if (!coin) {
|
|
console.error("coin not found");
|
|
return;
|
|
}
|
|
|
|
let exchange = await this.q().get<IExchangeInfo>("exchanges",
|
|
coin.exchangeBaseUrl);
|
|
if (!exchange) {
|
|
throw Error("db inconsistent");
|
|
}
|
|
|
|
let oldDenom = exchange.all_denoms.find((d) => d.denom_pub == coin!.denomPub);
|
|
|
|
if (!oldDenom) {
|
|
throw Error("db inconsistent");
|
|
}
|
|
|
|
let availableDenoms: Denomination[] = exchange.active_denoms;
|
|
|
|
let newCoinDenoms = getWithdrawDenomList(coin.currentAmount,
|
|
availableDenoms);
|
|
|
|
console.log("refreshing into", newCoinDenoms);
|
|
|
|
|
|
let refreshSession: RefreshSession = await (
|
|
this.cryptoApi.createWithdrawSession(3,
|
|
coin,
|
|
newCoinDenoms,
|
|
coin.currentAmount,
|
|
oldDenom.fee_refresh));
|
|
|
|
let reqUrl = URI("reserve/withdraw").absoluteTo(exchange!.baseUrl);
|
|
let resp = await this.http.postJson(reqUrl, {});
|
|
|
|
console.log("melt response:", resp.responseText);
|
|
|
|
// FIXME: implement rest
|
|
}
|
|
|
|
|
|
/**
|
|
* Retrive the full event history for this wallet.
|
|
*/
|
|
async getHistory(): Promise<any> {
|
|
function collect(x: any, acc: any) {
|
|
acc.push(x);
|
|
return acc;
|
|
}
|
|
|
|
let history = await (
|
|
this.q()
|
|
.iter("history", {indexName: "timestamp"})
|
|
.reduce(collect, []));
|
|
|
|
return {history};
|
|
}
|
|
|
|
async getExchanges(): Promise<IExchangeInfo[]> {
|
|
return this.q()
|
|
.iter<IExchangeInfo>("exchanges")
|
|
.flatMap((e) => [e])
|
|
.toArray();
|
|
}
|
|
|
|
async getReserves(exchangeBaseUrl: string): Promise<ReserveRecord[]> {
|
|
return this.q()
|
|
.iter<ReserveRecord>("reserves")
|
|
.filter((r: ReserveRecord) => r.exchange_base_url === exchangeBaseUrl)
|
|
.toArray();
|
|
}
|
|
|
|
async getCoins(exchangeBaseUrl: string): Promise<Coin[]> {
|
|
return this.q()
|
|
.iter<Coin>("coins")
|
|
.filter((c: Coin) => c.exchangeBaseUrl === exchangeBaseUrl)
|
|
.toArray();
|
|
}
|
|
|
|
async getPreCoins(exchangeBaseUrl: string): Promise<PreCoin[]> {
|
|
return this.q()
|
|
.iter<PreCoin>("precoins")
|
|
.filter((c: PreCoin) => c.exchangeBaseUrl === exchangeBaseUrl)
|
|
.toArray();
|
|
}
|
|
|
|
|
|
async hashContract(contract: any): Promise<string> {
|
|
return this.cryptoApi.hashString(canonicalJson(contract));
|
|
}
|
|
|
|
/**
|
|
* Check if there's an equivalent contract we've already purchased.
|
|
*/
|
|
async checkRepurchase(contract: Contract): Promise<CheckRepurchaseResult> {
|
|
if (!contract.repurchase_correlation_id) {
|
|
console.log("no repurchase: no correlation id");
|
|
return {isRepurchase: false};
|
|
}
|
|
let result: Transaction = await (
|
|
this.q()
|
|
.getIndexed("transactions",
|
|
"repurchase",
|
|
[
|
|
contract.merchant_pub,
|
|
contract.repurchase_correlation_id
|
|
]));
|
|
|
|
if (result) {
|
|
console.assert(result.contract.repurchase_correlation_id == contract.repurchase_correlation_id);
|
|
return {
|
|
isRepurchase: true,
|
|
existingContractHash: result.contractHash,
|
|
existingFulfillmentUrl: result.contract.fulfillment_url,
|
|
};
|
|
} else {
|
|
return {isRepurchase: false};
|
|
}
|
|
}
|
|
}
|