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+/*
+ 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
+} from "./types";
+import {HttpResponse, RequestException} from "./http";
+import {Query} from "./query";
+import {Checkable} from "./checkable";
+import {canonicalizeBaseUrl} from "./helpers";
+import {ReserveCreationInfo, Amounts} from "./types";
+import {PreCoin} from "./types";
+import {Reserve} 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;
+}
+
+interface ReserveRecord {
+ reserve_pub: string;
+ reserve_priv: string,
+ exchange_base_url: string,
+ created: number,
+ last_query: number|null,
+ /**
+ * Current amount left in the reserve
+ */
+ current_amount: AmountJson|null,
+ /**
+ * Amount requested when the reserve was created.
+ * When a reserve is re-used (rare!) the current_amount can
+ * be higher than the requested_amount
+ */
+ requested_amount: AmountJson,
+ /**
+ * Amount we've already withdrawn from the reserve.
+ */
+ withdrawn_amount: AmountJson;
+ confirmed: boolean,
+}
+
+
+@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();
+
+ 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");
+
+ Query(this.db)
+ .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");
+
+ Query(this.db)
+ .iter("reserves")
+ .reduce((reserve: any) => {
+ console.log("resuming reserve", reserve.reserve_pub);
+ this.processReserve(reserve);
+ });
+
+ Query(this.db)
+ .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 [
+ Query(this.db)
+ .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 Query(this.db)
+ .put("transactions", t)
+ .put("history", historyEntry)
+ .putAll("coins", payCoinInfo.map((pci) => pci.updatedCoin))
+ .finish();
+
+ this.notifier.notify();
+ }
+
+
+ async putHistory(historyEntry: HistoryRecord): Promise<void> {
+ await Query(this.db).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 Query(this.db)
+ .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
+ Query(this.db)
+ .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 Query(this.db)
+ .get("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: {
+ reservePub: reserveRecord.reserve_pub,
+ requestedAmount: reserveRecord.requested_amount,
+ currentAmount: reserveRecord.current_amount,
+ }
+ };
+ 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 ${retryDelayMs} ms`);
+ setTimeout(() => this.processReserve(reserveRecord, nextDelay),
+ retryDelayMs);
+ } finally {
+ this.stopOperation(opId);
+ }
+ }
+
+
+ private async processPreCoin(preCoin: PreCoin,
+ retryDelayMs = 100): Promise<void> {
+ try {
+ const coin = await this.withdrawExecute(preCoin);
+ this.storeCoin(coin);
+ } catch (e) {
+ console.error("Failed to withdraw coin from precoin, retrying in",
+ retryDelayMs,
+ "ms", e);
+ // exponential backoff truncated at one minute
+ let nextRetryDelayMs = Math.min(retryDelayMs * 2, 1000 * 60);
+ setTimeout(() => this.processPreCoin(preCoin, nextRetryDelayMs),
+ retryDelayMs);
+ }
+ }
+
+
+ /**
+ * Create a reserve, but do not flag it as confirmed yet.
+ */
+ async createReserve(req: CreateReserveRequest): Promise<CreateReserveResponse> {
+ let keypair = await this.cryptoApi.createEddsaKeypair();
+ const now = (new Date).getTime();
+ const canonExchange = canonicalizeBaseUrl(req.exchange);
+
+ const reserveRecord: ReserveRecord = {
+ reserve_pub: keypair.pub,
+ reserve_priv: keypair.priv,
+ exchange_base_url: canonExchange,
+ created: now,
+ last_query: null,
+ current_amount: null,
+ requested_amount: req.amount,
+ confirmed: false,
+ withdrawn_amount: Amounts.getZero(req.amount.currency)
+ };
+
+ const historyEntry = {
+ type: "create-reserve",
+ timestamp: now,
+ subjectId: `reserve-progress-${reserveRecord.reserve_pub}`,
+ 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();
+ let reserve: ReserveRecord = await Query(this.db)
+ .get("reserves", req.reservePub);
+ const historyEntry = {
+ type: "confirm-reserve",
+ timestamp: now,
+ subjectId: `reserve-progress-${reserve.reserve_pub}`,
+ detail: {
+ reservePub: req.reservePub,
+ requestedAmount: reserve.requested_amount,
+ }
+ };
+ if (!reserve) {
+ console.error("Unable to confirm reserve, not found in DB");
+ return;
+ }
+ reserve.confirmed = true;
+ await Query(this.db)
+ .put("reserves", reserve)
+ .put("history", historyEntry)
+ .finish();
+
+ this.processReserve(reserve);
+ }
+
+
+ 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: HistoryRecord = {
+ type: "withdraw",
+ timestamp: (new Date).getTime(),
+ level: HistoryLevel.Expert,
+ 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<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<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(),
+ subjectId: `reserve-progress-${reserve.reserve_pub}`,
+ detail: {
+ reservePub,
+ requestedAmount: reserve.requested_amount,
+ 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};
+ }
+
+ 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 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};
+ }
+ }
+} \ No newline at end of file
generated by cgit v1.2.3 (git 2.39.1) at 2025-09-25 08:18:59 +0000