summaryrefslogtreecommitdiff
path: root/src/headless/helpers.ts
blob: 67ba62df8f860d541a3a6668a327f7b1b1490cfc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
/*
 This file is part of GNU Taler
 (C) 2019 Taler Systems S.A.

 GNU 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.

 GNU 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
 GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
 */

/**
 * Helpers to create headless wallets.
 * @author Florian Dold <dold@taler.net>
 */

/**
 * Imports.
 */
import { Wallet } from "../wallet";
import { MemoryBackend, BridgeIDBFactory, shimIndexedDB } from "idb-bridge";
import { openTalerDatabase } from "../db";
import { HttpRequestLibrary } from "../util/http";
import { Bank } from "./bank";
import fs from "fs";
import { NodeThreadCryptoWorkerFactory } from "../crypto/workers/nodeThreadWorker";
import { WalletNotification, NotificationType } from "../types/notifications";
import { Database } from "../util/query";
import { NodeHttpLib } from "./NodeHttpLib";
import { Logger } from "../util/logging";
import { SynchronousCryptoWorkerFactory } from "../crypto/workers/synchronousWorker";
import { WithdrawalSourceType } from "../types/dbTypes";
import { Amounts } from "../util/amounts";

const logger = new Logger("helpers.ts");

export interface DefaultNodeWalletArgs {
  /**
   * Location of the wallet database.
   *
   * If not specified, the wallet starts out with an empty database and
   * the wallet database is stored only in memory.
   */
  persistentStoragePath?: string;

  /**
   * Handler for asynchronous notifications from the wallet.
   */
  notifyHandler?: (n: WalletNotification) => void;

  /**
   * If specified, use this as HTTP request library instead
   * of the default one.
   */
  httpLib?: HttpRequestLibrary;
}

/**
 * Get a wallet instance with default settings for node.
 */
export async function getDefaultNodeWallet(
  args: DefaultNodeWalletArgs = {},
): Promise<Wallet> {
  BridgeIDBFactory.enableTracing = false;
  const myBackend = new MemoryBackend();
  myBackend.enableTracing = false;

  const storagePath = args.persistentStoragePath;
  if (storagePath) {
    try {
      const dbContentStr: string = fs.readFileSync(storagePath, {
        encoding: "utf-8",
      });
      const dbContent = JSON.parse(dbContentStr);
      myBackend.importDump(dbContent);
    } catch (e) {
      console.error("could not read wallet file");
    }

    myBackend.afterCommitCallback = async () => {
      // Allow caller to stop persisting the wallet.
      if (args.persistentStoragePath === undefined) {
        return;
      }
      const dbContent = myBackend.exportDump();
      fs.writeFileSync(storagePath, JSON.stringify(dbContent, undefined, 2), {
        encoding: "utf-8",
      });
    };
  }

  BridgeIDBFactory.enableTracing = false;

  const myBridgeIdbFactory = new BridgeIDBFactory(myBackend);
  const myIdbFactory: IDBFactory = (myBridgeIdbFactory as any) as IDBFactory;

  let myHttpLib;
  if (args.httpLib) {
    myHttpLib = args.httpLib;
  } else {
    myHttpLib = new NodeHttpLib();
  }

  const myVersionChange = (): Promise<void> => {
    console.error("version change requested, should not happen");
    throw Error();
  };

  shimIndexedDB(myBridgeIdbFactory);

  const myDb = await openTalerDatabase(myIdbFactory, myVersionChange);

  let workerFactory;
  try {
    // Try if we have worker threads available, fails in older node versions.
    require("worker_threads");
    workerFactory = new NodeThreadCryptoWorkerFactory();
  } catch (e) {
    console.log(
      "worker threads not available, falling back to synchronous workers",
    );
    workerFactory = new SynchronousCryptoWorkerFactory();
  }

  const dbWrap = new Database(myDb);

  const w = new Wallet(dbWrap, myHttpLib, workerFactory);
  if (args.notifyHandler) {
    w.addNotificationListener(args.notifyHandler);
  }
  return w;
}

export async function withdrawTestBalance(
  myWallet: Wallet,
  amount = "TESTKUDOS:10",
  bankBaseUrl = "https://bank.test.taler.net/",
  exchangeBaseUrl = "https://exchange.test.taler.net/",
): Promise<void> {
  await myWallet.updateExchangeFromUrl(exchangeBaseUrl, true);
  const reserveResponse = await myWallet.acceptManualWithdrawal(exchangeBaseUrl, Amounts.parseOrThrow(amount));

  const reservePub = reserveResponse.reservePub;

  const bank = new Bank(bankBaseUrl);

  const bankUser = await bank.registerRandomUser();

  logger.trace(`Registered bank user ${JSON.stringify(bankUser)}`);

  const exchangePaytoUri = await myWallet.getExchangePaytoUri(exchangeBaseUrl, [
    "x-taler-bank",
  ]);

  const donePromise = new Promise((resolve, reject) => {
    myWallet.runRetryLoop().catch((x) => {
      reject(x);
    });
    myWallet.addNotificationListener((n) => {
      if (
        n.type === NotificationType.WithdrawGroupFinished &&
        n.withdrawalSource.type === WithdrawalSourceType.Reserve &&
        n.withdrawalSource.reservePub === reservePub
      ) {
        resolve();
      }
    });
  });

  await bank.createReserve(bankUser, amount, reservePub, exchangePaytoUri);
  await donePromise;
}