1067 lines
30 KiB
TypeScript
1067 lines
30 KiB
TypeScript
/*
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This file is part of TALER
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(C) 2015 GNUnet e.V.
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TALER is free software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation; either version 3, or (at your option) any later version.
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TALER is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
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*/
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/**
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* High-level wallet operations that should be indepentent from the underlying
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* browser extension interface.
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* @module Wallet
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* @author Florian Dold
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*/
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import {
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AmountJson,
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CreateReserveResponse,
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IExchangeInfo,
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Denomination,
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Notifier,
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WireInfo
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} from "./types";
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import {HttpResponse, RequestException} from "./http";
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import {Query} from "./query";
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import {Checkable} from "./checkable";
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import {canonicalizeBaseUrl} from "./helpers";
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import {ReserveCreationInfo, Amounts} from "./types";
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import {PreCoin} from "./types";
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import {Reserve} from "./types";
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import {CryptoApi} from "./cryptoApi";
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import {Coin} from "./types";
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import {PayCoinInfo} from "./types";
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import {CheckRepurchaseResult} from "./types";
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import {Contract} from "./types";
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import {ExchangeHandle} from "./types";
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"use strict";
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export interface CoinWithDenom {
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coin: Coin;
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denom: Denomination;
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}
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@Checkable.Class
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export class KeysJson {
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@Checkable.List(Checkable.Value(Denomination))
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denoms: Denomination[];
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@Checkable.String
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master_public_key: string;
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@Checkable.Any
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auditors: any[];
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@Checkable.String
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list_issue_date: string;
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@Checkable.Any
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signkeys: any;
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@Checkable.String
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eddsa_pub: string;
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@Checkable.String
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eddsa_sig: string;
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static checked: (obj: any) => KeysJson;
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}
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@Checkable.Class
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export class CreateReserveRequest {
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/**
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* The initial amount for the reserve.
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*/
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@Checkable.Value(AmountJson)
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amount: AmountJson;
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/**
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* Exchange URL where the bank should create the reserve.
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*/
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@Checkable.String
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exchange: string;
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static checked: (obj: any) => CreateReserveRequest;
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}
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@Checkable.Class
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export class ConfirmReserveRequest {
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/**
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* Public key of then reserve that should be marked
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* as confirmed.
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*/
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@Checkable.String
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reservePub: string;
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static checked: (obj: any) => ConfirmReserveRequest;
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}
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@Checkable.Class
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export class Offer {
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@Checkable.Value(Contract)
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contract: Contract;
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@Checkable.String
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merchant_sig: string;
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@Checkable.String
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H_contract: string;
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static checked: (obj: any) => Offer;
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}
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interface ExchangeCoins {
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[exchangeUrl: string]: CoinWithDenom[];
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}
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interface Transaction {
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contractHash: string;
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contract: Contract;
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payReq: any;
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merchantSig: string;
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}
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export interface Badge {
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setText(s: string): void;
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setColor(c: string): void;
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startBusy(): void;
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stopBusy(): void;
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}
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function deepEquals(x: any, y: any): boolean {
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if (x === y) {
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return true;
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}
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if (Array.isArray(x) && x.length !== y.length) {
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return false;
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}
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var p = Object.keys(x);
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return Object.keys(y).every((i) => p.indexOf(i) !== -1) &&
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p.every((i) => deepEquals(x[i], y[i]));
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}
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function flatMap<T, U>(xs: T[], f: (x: T) => U[]): U[] {
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return xs.reduce((acc: U[], next: T) => [...f(next), ...acc], []);
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}
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function getTalerStampSec(stamp: string): number|null {
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const m = stamp.match(/\/?Date\(([0-9]*)\)\/?/);
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if (!m) {
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return null;
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}
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return parseInt(m[1]);
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}
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function setTimeout(f: any, t: number) {
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return chrome.extension.getBackgroundPage().setTimeout(f, t);
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}
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function isWithdrawableDenom(d: Denomination) {
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const now_sec = (new Date).getTime() / 1000;
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const stamp_withdraw_sec = getTalerStampSec(d.stamp_expire_withdraw);
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// Withdraw if still possible to withdraw within a minute
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if (stamp_withdraw_sec + 60 > now_sec) {
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return true;
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}
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return false;
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}
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interface HttpRequestLibrary {
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req(method: string,
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url: string|uri.URI,
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options?: any): Promise<HttpResponse>;
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get(url: string|uri.URI): Promise<HttpResponse>;
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postJson(url: string|uri.URI, body: any): Promise<HttpResponse>;
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postForm(url: string|uri.URI, form: any): Promise<HttpResponse>;
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}
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function copy(o: any) {
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return JSON.parse(JSON.stringify(o));
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}
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/**
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* Result of updating exisiting information
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* about an exchange with a new '/keys' response.
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*/
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interface KeyUpdateInfo {
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updatedExchangeInfo: IExchangeInfo;
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addedDenominations: Denomination[];
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removedDenominations: Denomination[];
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}
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/**
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* Get a list of denominations (with repetitions possible)
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* whose total value is as close as possible to the available
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* amount, but never larger.
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*/
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function getWithdrawDenomList(amountAvailable: AmountJson,
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denoms: Denomination[]): Denomination[] {
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let remaining = Amounts.copy(amountAvailable);
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const ds: Denomination[] = [];
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denoms = denoms.filter(isWithdrawableDenom);
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denoms.sort((d1, d2) => Amounts.cmp(d2.value, d1.value));
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// This is an arbitrary number of coins
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// we can withdraw in one go. It's not clear if this limit
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// is useful ...
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for (let i = 0; i < 1000; i++) {
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let found = false;
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for (let d of denoms) {
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let cost = Amounts.add(d.value, d.fee_withdraw).amount;
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if (Amounts.cmp(remaining, cost) < 0) {
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continue;
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}
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found = true;
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remaining = Amounts.sub(remaining, cost).amount;
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ds.push(d);
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break;
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}
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if (!found) {
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break;
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}
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}
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return ds;
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}
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export class Wallet {
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private db: IDBDatabase;
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private http: HttpRequestLibrary;
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private badge: Badge;
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private notifier: Notifier;
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public cryptoApi: CryptoApi;
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/**
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* Set of identifiers for running operations.
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*/
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private runningOperations: Set<string> = new Set();
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constructor(db: IDBDatabase,
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http: HttpRequestLibrary,
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badge: Badge,
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notifier: Notifier) {
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this.db = db;
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this.http = http;
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this.badge = badge;
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this.notifier = notifier;
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this.cryptoApi = new CryptoApi();
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this.resumePendingFromDb();
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}
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private startOperation(operationId: string) {
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this.runningOperations.add(operationId);
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this.badge.startBusy();
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}
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private stopOperation(operationId: string) {
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this.runningOperations.delete(operationId);
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if (this.runningOperations.size == 0) {
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this.badge.stopBusy();
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}
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}
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updateExchanges(): void {
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console.log("updating exchanges");
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Query(this.db)
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.iter("exchanges")
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.reduce((exchange: IExchangeInfo) => {
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this.updateExchangeFromUrl(exchange.baseUrl)
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.catch((e) => {
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console.error("updating exchange failed", e);
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});
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});
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}
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/**
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* Resume various pending operations that are pending
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* by looking at the database.
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*/
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private resumePendingFromDb(): void {
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console.log("resuming pending operations from db");
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Query(this.db)
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.iter("reserves")
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.reduce((reserve: any) => {
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console.log("resuming reserve", reserve.reserve_pub);
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this.processReserve(reserve);
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});
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Query(this.db)
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.iter("precoins")
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.reduce((preCoin: any) => {
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console.log("resuming precoin");
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this.processPreCoin(preCoin);
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});
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}
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/**
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* Get exchanges and associated coins that are still spendable,
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* but only if the sum the coins' remaining value exceeds the payment amount.
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*/
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private async getPossibleExchangeCoins(paymentAmount: AmountJson,
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depositFeeLimit: AmountJson,
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allowedExchanges: ExchangeHandle[]): Promise<ExchangeCoins> {
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// Mapping from exchange base URL to list of coins together with their
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// denomination
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let m: ExchangeCoins = {};
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let x: number;
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function storeExchangeCoin(mc: any, url: string) {
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let exchange: IExchangeInfo = mc[0];
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console.log("got coin for exchange", url);
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let coin: Coin = mc[1];
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if (coin.suspended) {
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console.log("skipping suspended coin",
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coin.denomPub,
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"from exchange",
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exchange.baseUrl);
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return;
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}
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let denom = exchange.active_denoms.find((e) => e.denom_pub === coin.denomPub);
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if (!denom) {
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console.warn("denom not found (database inconsistent)");
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return;
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}
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if (denom.value.currency !== paymentAmount.currency) {
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console.warn("same pubkey for different currencies");
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return;
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}
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let cd = {coin, denom};
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let x = m[url];
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if (!x) {
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m[url] = [cd];
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} else {
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x.push(cd);
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}
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}
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// Make sure that we don't look up coins
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// for the same URL twice ...
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let handledExchanges = new Set();
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let ps = flatMap(allowedExchanges, (info: ExchangeHandle) => {
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if (handledExchanges.has(info.url)) {
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return [];
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}
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handledExchanges.add(info.url);
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console.log("Checking for merchant's exchange", JSON.stringify(info));
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return [
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Query(this.db)
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.iter("exchanges", {indexName: "pubKey", only: info.master_pub})
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.indexJoin("coins", "exchangeBaseUrl", (exchange) => exchange.baseUrl)
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.reduce((x) => storeExchangeCoin(x, info.url))
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];
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});
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await Promise.all(ps);
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let ret: ExchangeCoins = {};
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if (Object.keys(m).length == 0) {
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console.log("not suitable exchanges found");
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}
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console.dir(m);
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// We try to find the first exchange where we have
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// enough coins to cover the paymentAmount with fees
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// under depositFeeLimit
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nextExchange:
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for (let key in m) {
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let coins = m[key];
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// Sort by ascending deposit fee
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coins.sort((o1, o2) => Amounts.cmp(o1.denom.fee_deposit,
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o2.denom.fee_deposit));
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let maxFee = Amounts.copy(depositFeeLimit);
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let minAmount = Amounts.copy(paymentAmount);
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let accFee = Amounts.copy(coins[0].denom.fee_deposit);
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let accAmount = Amounts.getZero(coins[0].coin.currentAmount.currency);
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let usableCoins: CoinWithDenom[] = [];
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nextCoin:
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for (let i = 0; i < coins.length; i++) {
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let coinAmount = Amounts.copy(coins[i].coin.currentAmount);
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let coinFee = coins[i].denom.fee_deposit;
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if (Amounts.cmp(coinAmount, coinFee) <= 0) {
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continue nextCoin;
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}
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accFee = Amounts.add(accFee, coinFee).amount;
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accAmount = Amounts.add(accAmount, coinAmount).amount;
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if (Amounts.cmp(accFee, maxFee) >= 0) {
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// FIXME: if the fees are too high, we have
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// to cover them ourselves ....
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console.log("too much fees");
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continue nextExchange;
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}
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usableCoins.push(coins[i]);
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if (Amounts.cmp(accAmount, minAmount) >= 0) {
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ret[key] = usableCoins;
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continue nextExchange;
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}
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}
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}
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return ret;
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}
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/**
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* Record all information that is necessary to
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* pay for a contract in the wallet's database.
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*/
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private async recordConfirmPay(offer: Offer,
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payCoinInfo: PayCoinInfo,
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chosenExchange: string): Promise<void> {
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let payReq: any = {};
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payReq["amount"] = offer.contract.amount;
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payReq["coins"] = payCoinInfo.map((x) => x.sig);
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payReq["H_contract"] = offer.H_contract;
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payReq["max_fee"] = offer.contract.max_fee;
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payReq["merchant_sig"] = offer.merchant_sig;
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payReq["exchange"] = URI(chosenExchange).href();
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payReq["refund_deadline"] = offer.contract.refund_deadline;
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payReq["timestamp"] = offer.contract.timestamp;
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payReq["transaction_id"] = offer.contract.transaction_id;
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let t: Transaction = {
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contractHash: offer.H_contract,
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contract: offer.contract,
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payReq: payReq,
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merchantSig: offer.merchant_sig,
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};
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let historyEntry = {
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type: "pay",
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timestamp: (new Date).getTime(),
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detail: {
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merchantName: offer.contract.merchant.name,
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amount: offer.contract.amount,
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contractHash: offer.H_contract,
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fulfillmentUrl: offer.contract.fulfillment_url
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}
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};
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await Query(this.db)
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.put("transactions", t)
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.put("history", historyEntry)
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.putAll("coins", payCoinInfo.map((pci) => pci.updatedCoin))
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.finish();
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this.notifier.notify();
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}
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/**
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* Add a contract to the wallet and sign coins,
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* but do not send them yet.
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*/
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async confirmPay(offer: Offer): Promise<any> {
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console.log("executing confirmPay");
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let transaction = await Query(this.db)
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.get("transactions", offer.H_contract);
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if (transaction) {
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// Already payed ...
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return {};
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}
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let mcs = await this.getPossibleExchangeCoins(offer.contract.amount,
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offer.contract.max_fee,
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offer.contract.exchanges);
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if (Object.keys(mcs).length == 0) {
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console.log("not confirming payment, insufficient coins");
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return {
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error: "coins-insufficient",
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};
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}
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let exchangeUrl = Object.keys(mcs)[0];
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let ds = await this.cryptoApi.signDeposit(offer, mcs[exchangeUrl]);
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await this.recordConfirmPay(offer,
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ds,
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exchangeUrl);
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return {};
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}
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|
|
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/**
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* Add a contract to the wallet and sign coins,
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* but do not send them yet.
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*/
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async checkPay(offer: Offer): Promise<any> {
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// First check if we already payed for it.
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let transaction = await
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Query(this.db)
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.get("transactions", offer.H_contract);
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if (transaction) {
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return {isPayed: true};
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}
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// If not already payed, check if we could pay for it.
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let mcs = await this.getPossibleExchangeCoins(offer.contract.amount,
|
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offer.contract.max_fee,
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offer.contract.exchanges);
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if (Object.keys(mcs).length == 0) {
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console.log("not confirming payment, insufficient coins");
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return {
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error: "coins-insufficient",
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};
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}
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return {isPayed: false};
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}
|
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|
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|
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/**
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* Retrieve all necessary information for looking up the contract
|
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* with the given hash.
|
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*/
|
|
async executePayment(H_contract: string): Promise<any> {
|
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let t = await Query(this.db)
|
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.get("transactions", H_contract);
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if (!t) {
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return {
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success: false,
|
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contractFound: false,
|
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}
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}
|
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let resp = {
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success: true,
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payReq: t.payReq,
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contract: t.contract,
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};
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return resp;
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}
|
|
|
|
|
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/**
|
|
* First fetch information requred to withdraw from the reserve,
|
|
* then deplete the reserve, withdrawing coins until it is empty.
|
|
*/
|
|
private async processReserve(reserveRecord: any,
|
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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);
|
|
await this.depleteReserve(reserve, exchange);
|
|
let depleted = {
|
|
type: "depleted-reserve",
|
|
timestamp: (new Date).getTime(),
|
|
detail: {
|
|
reservePub: reserveRecord.reserve_pub,
|
|
}
|
|
};
|
|
await Query(this.db).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: any,
|
|
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 = {
|
|
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,
|
|
};
|
|
|
|
const historyEntry = {
|
|
type: "create-reserve",
|
|
timestamp: now,
|
|
detail: {
|
|
requestedAmount: req.amount,
|
|
reservePub: reserveRecord.reserve_pub,
|
|
}
|
|
};
|
|
|
|
await Query(this.db)
|
|
.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();
|
|
const historyEntry = {
|
|
type: "confirm-reserve",
|
|
timestamp: now,
|
|
detail: {
|
|
reservePub: req.reservePub,
|
|
}
|
|
};
|
|
let r = await Query(this.db)
|
|
.get("reserves", req.reservePub);
|
|
if (!r) {
|
|
console.error("Unable to confirm reserve, not found in DB");
|
|
return;
|
|
}
|
|
r.confirmed = true;
|
|
await Query(this.db)
|
|
.put("reserves", r)
|
|
.put("history", historyEntry)
|
|
.finish();
|
|
|
|
this.processReserve(r);
|
|
}
|
|
|
|
|
|
private async withdrawExecute(pc: PreCoin): Promise<Coin> {
|
|
let reserve = await Query(this.db)
|
|
.get("reserves", pc.reservePub);
|
|
|
|
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> {
|
|
console.log("storing coin", new Date());
|
|
let historyEntry = {
|
|
type: "withdraw",
|
|
timestamp: (new Date).getTime(),
|
|
detail: {
|
|
coinPub: coin.coinPub,
|
|
}
|
|
};
|
|
await Query(this.db)
|
|
.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: Reserve): Promise<void> {
|
|
console.log("creating pre coin at", new Date());
|
|
let preCoin = await this.cryptoApi
|
|
.createPreCoin(denom, reserve);
|
|
await Query(this.db)
|
|
.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<void> {
|
|
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);
|
|
}
|
|
|
|
|
|
/**
|
|
* 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<Reserve> {
|
|
let reserve = await Query(this.db)
|
|
.get("reserves", reservePub);
|
|
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(),
|
|
detail: {
|
|
reservePub,
|
|
oldAmount,
|
|
newAmount
|
|
}
|
|
};
|
|
await Query(this.db)
|
|
.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 Query(this.db)
|
|
.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 = Query(this.db);
|
|
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 Query(this.db).get("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 Query(this.db)
|
|
.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 Query(this.db)
|
|
.iter("coins")
|
|
.reduce(collectBalances, {});
|
|
|
|
return {balances: byCurrency};
|
|
}
|
|
|
|
|
|
/**
|
|
* 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
|
|
Query(this.db)
|
|
.iter("history", {indexName: "timestamp"})
|
|
.reduce(collect, []);
|
|
|
|
return {history};
|
|
}
|
|
|
|
/**
|
|
* 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 Query(this.db)
|
|
.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};
|
|
}
|
|
}
|
|
} |