From ffd2a62c3f7df94365980302fef3bc3376b48182 Mon Sep 17 00:00:00 2001 From: Florian Dold Date: Mon, 3 Aug 2020 13:00:48 +0530 Subject: modularize repo, use pnpm, improve typechecking --- packages/taler-wallet-android/src/index.ts | 285 +++++++++++++++++++++++++++++ 1 file changed, 285 insertions(+) create mode 100644 packages/taler-wallet-android/src/index.ts (limited to 'packages/taler-wallet-android/src/index.ts') diff --git a/packages/taler-wallet-android/src/index.ts b/packages/taler-wallet-android/src/index.ts new file mode 100644 index 000000000..d0001e991 --- /dev/null +++ b/packages/taler-wallet-android/src/index.ts @@ -0,0 +1,285 @@ +/* + This file is part of GNU Taler + (C) 2019 GNUnet e.V. + + 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 + */ + +/** + * Imports. + */ +import { + Wallet, + getDefaultNodeWallet, + DefaultNodeWalletArgs, + versions, + httpLib, + nodeThreadWorker, + promiseUtil, + NodeHttpLib, + walletCoreApi, + walletNotifications, + TalerErrorCode, + makeErrorDetails, +} from "taler-wallet-core"; + +import fs from "fs"; + +export const handleWorkerError = nodeThreadWorker.handleWorkerError; +export const handleWorkerMessage = nodeThreadWorker.handleWorkerMessage; + +export class AndroidHttpLib implements httpLib.HttpRequestLibrary { + useNfcTunnel = false; + + private nodeHttpLib: httpLib.HttpRequestLibrary = new NodeHttpLib(); + + private requestId = 1; + + private requestMap: { + [id: number]: promiseUtil.OpenedPromise; + } = {}; + + constructor(private sendMessage: (m: string) => void) {} + + get( + url: string, + opt?: httpLib.HttpRequestOptions, + ): Promise { + if (this.useNfcTunnel) { + const myId = this.requestId++; + const p = promiseUtil.openPromise(); + this.requestMap[myId] = p; + const request = { + method: "get", + url, + }; + this.sendMessage( + JSON.stringify({ + type: "tunnelHttp", + request, + id: myId, + }), + ); + return p.promise; + } else { + return this.nodeHttpLib.get(url, opt); + } + } + + postJson( + url: string, + body: any, + opt?: httpLib.HttpRequestOptions, + ): Promise { + if (this.useNfcTunnel) { + const myId = this.requestId++; + const p = promiseUtil.openPromise(); + this.requestMap[myId] = p; + const request = { + method: "postJson", + url, + body, + }; + this.sendMessage( + JSON.stringify({ type: "tunnelHttp", request, id: myId }), + ); + return p.promise; + } else { + return this.nodeHttpLib.postJson(url, body, opt); + } + } + + handleTunnelResponse(msg: any): void { + const myId = msg.id; + const p = this.requestMap[myId]; + if (!p) { + console.error( + `no matching request for tunneled HTTP response, id=${myId}`, + ); + } + const headers = new httpLib.Headers(); + if (msg.status != 0) { + const resp: httpLib.HttpResponse = { + // FIXME: pass through this URL + requestUrl: "", + headers, + status: msg.status, + json: async () => JSON.parse(msg.responseText), + text: async () => msg.responseText, + }; + p.resolve(resp); + } else { + p.reject(new Error(`unexpected HTTP status code ${msg.status}`)); + } + delete this.requestMap[myId]; + } +} + +function sendAkonoMessage(ev: walletCoreApi.CoreApiEnvelope): void { + // @ts-ignore + const sendMessage = globalThis.__akono_sendMessage; + if (typeof sendMessage !== "function") { + const errMsg = + "FATAL: cannot install android wallet listener: akono functions missing"; + console.error(errMsg); + throw new Error(errMsg); + } + const m = JSON.stringify(ev); + // @ts-ignore + sendMessage(m); +} + +class AndroidWalletMessageHandler { + walletArgs: DefaultNodeWalletArgs | undefined; + maybeWallet: Wallet | undefined; + wp = promiseUtil.openPromise(); + httpLib = new NodeHttpLib(); + + /** + * Handle a request from the Android wallet. + */ + async handleMessage( + operation: string, + id: string, + args: any, + ): Promise { + const wrapResponse = ( + result: unknown, + ): walletCoreApi.CoreApiResponseSuccess => { + return { + type: "response", + id, + operation, + result, + }; + }; + switch (operation) { + case "init": { + this.walletArgs = { + notifyHandler: async ( + notification: walletNotifications.WalletNotification, + ) => { + sendAkonoMessage({ type: "notification", payload: notification }); + }, + persistentStoragePath: args.persistentStoragePath, + httpLib: this.httpLib, + }; + const w = await getDefaultNodeWallet(this.walletArgs); + this.maybeWallet = w; + w.runRetryLoop().catch((e) => { + console.error("Error during wallet retry loop", e); + }); + this.wp.resolve(w); + return wrapResponse({ + supported_protocol_versions: { + exchange: versions.WALLET_EXCHANGE_PROTOCOL_VERSION, + merchant: versions.WALLET_MERCHANT_PROTOCOL_VERSION, + }, + }); + } + case "getHistory": { + return wrapResponse({ history: [] }); + } + case "startTunnel": { + // this.httpLib.useNfcTunnel = true; + throw Error("not implemented"); + } + case "stopTunnel": { + // this.httpLib.useNfcTunnel = false; + throw Error("not implemented"); + } + case "tunnelResponse": { + // httpLib.handleTunnelResponse(msg.args); + throw Error("not implemented"); + } + case "reset": { + const oldArgs = this.walletArgs; + this.walletArgs = { ...oldArgs }; + if (oldArgs && oldArgs.persistentStoragePath) { + try { + fs.unlinkSync(oldArgs.persistentStoragePath); + } catch (e) { + console.error("Error while deleting the wallet db:", e); + } + // Prevent further storage! + this.walletArgs.persistentStoragePath = undefined; + } + const wallet = await this.wp.promise; + wallet.stop(); + this.wp = promiseUtil.openPromise(); + this.maybeWallet = undefined; + const w = await getDefaultNodeWallet(this.walletArgs); + this.maybeWallet = w; + w.runRetryLoop().catch((e) => { + console.error("Error during wallet retry loop", e); + }); + this.wp.resolve(w); + return wrapResponse({}); + } + default: { + const wallet = await this.wp.promise; + return await walletCoreApi.handleCoreApiRequest( + wallet, + operation, + id, + args, + ); + } + } + } +} + +export function installAndroidWalletListener(): void { + const handler = new AndroidWalletMessageHandler(); + const onMessage = async (msgStr: any): Promise => { + if (typeof msgStr !== "string") { + console.error("expected string as message"); + return; + } + const msg = JSON.parse(msgStr); + const operation = msg.operation; + if (typeof operation !== "string") { + console.error( + "message to android wallet helper must contain operation of type string", + ); + return; + } + const id = msg.id; + console.log(`android listener: got request for ${operation} (${id})`); + + try { + const respMsg = await handler.handleMessage(operation, id, msg.args); + console.log( + `android listener: sending success response for ${operation} (${id})`, + ); + sendAkonoMessage(respMsg); + } catch (e) { + const respMsg: walletCoreApi.CoreApiResponse = { + type: "error", + id, + operation, + error: makeErrorDetails( + TalerErrorCode.WALLET_UNEXPECTED_EXCEPTION, + "unexpected exception", + {}, + ), + }; + sendAkonoMessage(respMsg); + return; + } + }; + + // @ts-ignore + globalThis.__akono_onMessage = onMessage; + + console.log("android wallet listener installed"); +} -- cgit v1.2.3