From ffd2a62c3f7df94365980302fef3bc3376b48182 Mon Sep 17 00:00:00 2001
From: Florian Dold <florian.dold@gmail.com>
Date: Mon, 3 Aug 2020 13:00:48 +0530
Subject: modularize repo, use pnpm, improve typechecking

---
 packages/taler-wallet-core/src/headless/helpers.ts | 135 +++++++++++++++++++++
 1 file changed, 135 insertions(+)
 create mode 100644 packages/taler-wallet-core/src/headless/helpers.ts

(limited to 'packages/taler-wallet-core/src/headless/helpers.ts')

diff --git a/packages/taler-wallet-core/src/headless/helpers.ts b/packages/taler-wallet-core/src/headless/helpers.ts
new file mode 100644
index 000000000..953493299
--- /dev/null
+++ b/packages/taler-wallet-core/src/headless/helpers.ts
@@ -0,0 +1,135 @@
+/*
+ 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 fs from "fs";
+import { NodeThreadCryptoWorkerFactory } from "../crypto/workers/nodeThreadWorker";
+import { WalletNotification } from "../types/notifications";
+import { Database } from "../util/query";
+import { NodeHttpLib } from "./NodeHttpLib";
+import { Logger } from "../util/logging";
+import { SynchronousCryptoWorkerFactory } from "../crypto/workers/synchronousWorker";
+import type { IDBFactory } from "idb-bridge/lib/idbtypes";
+
+const logger = new Logger("headless/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) {
+      logger.warn("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;
+}
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