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/*
This file is part of TALER
(C) 2016 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/>
*/
/**
* Messaging for the WebExtensions wallet. Should contain
* parts that are specific for WebExtensions, but as little business
* logic as possible.
*/
/**
* Imports.
*/
import {
classifyTalerUri,
CoreApiResponse,
CoreApiResponseSuccess,
NotificationType,
TalerErrorCode,
TalerUriType,
WalletDiagnostics,
} from "@gnu-taler/taler-util";
import {
DbAccess,
deleteTalerDatabase,
makeErrorDetails,
OpenedPromise,
openPromise,
openTalerDatabase,
Wallet,
WalletStoresV1,
} from "@gnu-taler/taler-wallet-core";
import { BrowserCryptoWorkerFactory } from "./browserCryptoWorkerFactory";
import { BrowserHttpLib } from "./browserHttpLib";
import { getPermissionsApi, isFirefox } from "./compat";
import { getReadRequestPermissions } from "./permissions";
import { SynchronousCryptoWorkerFactory } from "./serviceWorkerCryptoWorkerFactory.js";
import { ServiceWorkerHttpLib } from "./serviceWorkerHttpLib";
/**
* Currently active wallet instance. Might be unloaded and
* re-instantiated when the database is reset.
*
* FIXME: Maybe move the wallet resetting into the Wallet class?
*/
let currentWallet: Wallet | undefined;
let currentDatabase: DbAccess<typeof WalletStoresV1> | undefined;
/**
* Last version of an outdated DB, if applicable.
*/
let outdatedDbVersion: number | undefined;
const walletInit: OpenedPromise<void> = openPromise<void>();
const notificationPorts: chrome.runtime.Port[] = [];
async function getDiagnostics(): Promise<WalletDiagnostics> {
const manifestData = chrome.runtime.getManifest();
const errors: string[] = [];
let firefoxIdbProblem = false;
let dbOutdated = false;
try {
await walletInit.promise;
} catch (e) {
errors.push("Error during wallet initialization: " + e);
if (
currentDatabase === undefined &&
outdatedDbVersion === undefined &&
isFirefox()
) {
firefoxIdbProblem = true;
}
}
if (!currentWallet) {
errors.push("Could not create wallet backend.");
}
if (!currentDatabase) {
errors.push("Could not open database");
}
if (outdatedDbVersion !== undefined) {
errors.push(`Outdated DB version: ${outdatedDbVersion}`);
dbOutdated = true;
}
const diagnostics: WalletDiagnostics = {
walletManifestDisplayVersion: manifestData.version_name || "(undefined)",
walletManifestVersion: manifestData.version,
errors,
firefoxIdbProblem,
dbOutdated,
};
return diagnostics;
}
async function dispatch(
req: any,
sender: any,
sendResponse: any,
): Promise<void> {
let r: CoreApiResponse;
const wrapResponse = (result: unknown): CoreApiResponseSuccess => {
return {
type: "response",
id: req.id,
operation: req.operation,
result,
};
};
switch (req.operation) {
case "wxGetDiagnostics": {
r = wrapResponse(await getDiagnostics());
break;
}
case "reset-db": {
await deleteTalerDatabase(indexedDB as any);
r = wrapResponse(await reinitWallet());
break;
}
case "wxGetExtendedPermissions": {
const res = await new Promise((resolve, reject) => {
getPermissionsApi().contains(
getReadRequestPermissions(),
(result: boolean) => {
resolve(result);
},
);
});
r = wrapResponse({ newValue: res });
break;
}
case "wxSetExtendedPermissions": {
const newVal = req.payload.value;
console.log("new extended permissions value", newVal);
if (newVal) {
setupHeaderListener();
r = wrapResponse({ newValue: true });
} else {
await new Promise<void>((resolve, reject) => {
getPermissionsApi().remove(getReadRequestPermissions(), (rem) => {
console.log("permissions removed:", rem);
resolve();
});
});
r = wrapResponse({ newVal: false });
}
break;
}
default: {
const w = currentWallet;
if (!w) {
r = {
type: "error",
id: req.id,
operation: req.operation,
error: makeErrorDetails(
TalerErrorCode.WALLET_CORE_NOT_AVAILABLE,
"wallet core not available",
{},
),
};
break;
}
r = await w.handleCoreApiRequest(req.operation, req.id, req.payload);
break;
}
}
try {
sendResponse(r);
} catch (e) {
// might fail if tab disconnected
}
}
function getTab(tabId: number): Promise<chrome.tabs.Tab> {
return new Promise((resolve, reject) => {
chrome.tabs.get(tabId, (tab: chrome.tabs.Tab) => resolve(tab));
});
}
function setBadgeText(options: chrome.action.BadgeTextDetails): void {
// not supported by all browsers ...
if (chrome && chrome.action && chrome.action.setBadgeText) {
chrome.action.setBadgeText(options);
} else {
console.warn("can't set badge text, not supported", options);
}
}
function waitMs(timeoutMs: number): Promise<void> {
return new Promise((resolve, reject) => {
const bgPage = chrome.extension.getBackgroundPage();
if (!bgPage) {
reject("fatal: no background page");
return;
}
bgPage.setTimeout(() => resolve(), timeoutMs);
});
}
function makeSyncWalletRedirect(
url: string,
tabId: number,
oldUrl: string,
params?: { [name: string]: string | undefined },
): Record<string, unknown> {
const innerUrl = new URL(chrome.runtime.getURL(url));
if (params) {
const hParams = Object.keys(params)
.map((k) => `${k}=${params[k]}`)
.join("&");
innerUrl.hash = innerUrl.hash + "?" + hParams;
}
// Some platforms don't support the sync redirect (yet), so fall back to
// async redirect after a timeout.
const doit = async (): Promise<void> => {
await waitMs(150);
const tab = await getTab(tabId);
if (tab.url === oldUrl) {
console.log("redirecting to", innerUrl.href);
chrome.tabs.update(tabId, { url: innerUrl.href, loadReplace: true } as any);
}
};
doit();
return { redirectUrl: innerUrl.href };
}
export type MessageFromBackend = {
type: NotificationType;
};
async function reinitWallet(): Promise<void> {
if (currentWallet) {
currentWallet.stop();
currentWallet = undefined;
}
currentDatabase = undefined;
setBadgeText({ text: "" });
try {
currentDatabase = await openTalerDatabase(indexedDB as any, reinitWallet);
} catch (e) {
console.error("could not open database", e);
walletInit.reject(e);
return;
}
let httpLib;
let cryptoWorker;
if (chrome.runtime.getManifest().manifest_version === 3) {
httpLib = new ServiceWorkerHttpLib();
cryptoWorker = new SynchronousCryptoWorkerFactory();
} else {
httpLib = new BrowserHttpLib();
cryptoWorker = new BrowserCryptoWorkerFactory();
}
console.log("setting wallet");
const wallet = await Wallet.create(currentDatabase, httpLib, cryptoWorker);
try {
await wallet.handleCoreApiRequest("initWallet", "native-init", {});
} catch (e) {
console.error("could not initialize wallet", e);
walletInit.reject(e);
return;
}
wallet.addNotificationListener((x) => {
for (const notif of notificationPorts) {
const message: MessageFromBackend = { type: x.type };
try {
notif.postMessage(message);
} catch (e) {
console.error(e);
}
}
});
wallet.runTaskLoop().catch((e) => {
console.log("error during wallet task loop", e);
});
// Useful for debugging in the background page.
if (typeof window !== "undefined") {
(window as any).talerWallet = wallet;
}
currentWallet = wallet;
walletInit.resolve();
}
try {
// This needs to be outside of main, as Firefox won't fire the event if
// the listener isn't created synchronously on loading the backend.
chrome.runtime.onInstalled.addListener((details) => {
console.log("onInstalled with reason", details.reason);
if (details.reason === "install") {
const url = chrome.runtime.getURL("/static/wallet.html#/welcome");
chrome.tabs.create({ active: true, url });
}
});
} catch (e) {
console.error(e);
}
function headerListener(
details: chrome.webRequest.WebResponseHeadersDetails,
): chrome.webRequest.BlockingResponse | undefined {
if (chrome.runtime.lastError) {
console.error(chrome.runtime.lastError);
return;
}
const wallet = currentWallet;
if (!wallet) {
console.warn("wallet not available while handling header");
return;
}
if (
details.statusCode === 402 ||
details.statusCode === 202 ||
details.statusCode === 200
) {
for (const header of details.responseHeaders || []) {
if (header.name.toLowerCase() === "taler") {
const talerUri = header.value || "";
const uriType = classifyTalerUri(talerUri);
switch (uriType) {
case TalerUriType.TalerWithdraw:
return makeSyncWalletRedirect(
"/static/wallet.html#/cta/withdraw",
details.tabId,
details.url,
{
talerWithdrawUri: talerUri,
},
);
case TalerUriType.TalerPay:
return makeSyncWalletRedirect(
"/static/wallet.html#/cta/pay",
details.tabId,
details.url,
{
talerPayUri: talerUri,
},
);
case TalerUriType.TalerTip:
return makeSyncWalletRedirect(
"/static/wallet.html#/cta/tip",
details.tabId,
details.url,
{
talerTipUri: talerUri,
},
);
case TalerUriType.TalerRefund:
return makeSyncWalletRedirect(
"/static/wallet.html#/cta/refund",
details.tabId,
details.url,
{
talerRefundUri: talerUri,
},
);
case TalerUriType.TalerNotifyReserve:
Promise.resolve().then(() => {
const w = currentWallet;
if (!w) {
return;
}
// FIXME: Is this still useful?
// handleNotifyReserve(w);
});
break;
default:
console.warn(
"Response with HTTP 402 has Taler header, but header value is not a taler:// URI.",
);
break;
}
}
}
}
return;
}
function setupHeaderListener(): void {
// if (chrome.runtime.getManifest().manifest_version === 3) {
// console.error("cannot block request on manfest v3")
// return
// }
console.log("setting up header listener");
// Handlers for catching HTTP requests
getPermissionsApi().contains(
getReadRequestPermissions(),
(result: boolean) => {
if (
"webRequest" in chrome &&
"onHeadersReceived" in chrome.webRequest &&
chrome.webRequest.onHeadersReceived.hasListener(headerListener)
) {
chrome.webRequest.onHeadersReceived.removeListener(headerListener);
}
if (result) {
console.log("actually adding listener");
chrome.webRequest.onHeadersReceived.addListener(
headerListener,
{ urls: ["<all_urls>"] },
["responseHeaders"],
);
}
if ("webRequest" in chrome) {
chrome.webRequest.handlerBehaviorChanged(() => {
if (chrome.runtime.lastError) {
console.error(chrome.runtime.lastError);
}
});
}
},
);
}
/**
* Main function to run for the WebExtension backend.
*
* Sets up all event handlers and other machinery.
*/
export async function wxMain(): Promise<void> {
// Explicitly unload the extension page as soon as an update is available,
// so the update gets installed as soon as possible.
chrome.runtime.onUpdateAvailable.addListener((details) => {
console.log("update available:", details);
chrome.runtime.reload();
});
const afterWalletIsInitialized = reinitWallet();
// Handlers for messages coming directly from the content
// script on the page
chrome.runtime.onMessage.addListener((req, sender, sendResponse) => {
afterWalletIsInitialized.then(() => {
dispatch(req, sender, sendResponse);
});
return true;
});
chrome.runtime.onConnect.addListener((port) => {
notificationPorts.push(port);
port.onDisconnect.addListener((discoPort) => {
const idx = notificationPorts.indexOf(discoPort);
if (idx >= 0) {
notificationPorts.splice(idx, 1);
}
});
});
try {
if (chrome.runtime.getManifest().manifest_version === 2) {
setupHeaderListener();
}
} catch (e) {
console.log(e);
}
// On platforms that support it, also listen to external
// modification of permissions.
getPermissionsApi().addPermissionsListener((perm) => {
if (chrome.runtime.lastError) {
console.error(chrome.runtime.lastError);
return;
}
setupHeaderListener();
});
}
|