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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/>
*/
// tslint:disable:no-unused-expression
/**
* Module that is injected into (all!) pages to allow them
* to interact with the GNU Taler wallet via DOM Events.
*/
/**
* Imports.
*/
import * as wxApi from "./wxApi";
declare let cloneInto: any;
let logVerbose = false;
try {
logVerbose = !!localStorage.getItem("taler-log-verbose");
} catch (e) {
// can't read from local storage
}
if (document.documentElement.getAttribute("data-taler-nojs")) {
document.dispatchEvent(new Event("taler-probe-result"));
}
interface Handler {
type: string;
listener: (e: Event) => void | Promise<void>;
}
const handlers: Handler[] = [];
let sheet: CSSStyleSheet | null;
function initStyle(): void {
logVerbose && console.log("taking over styles");
const name = "taler-presence-stylesheet";
const content = "/* Taler stylesheet controlled by JS */";
let style = document.getElementById(name) as HTMLStyleElement | null;
if (!style) {
style = document.createElement("style");
// Needed by WebKit
style.appendChild(document.createTextNode(content));
style.id = name;
document.head.appendChild(style);
sheet = style.sheet as CSSStyleSheet;
} else {
// We've taken over the stylesheet now,
// make it clear by clearing all the rules in it
// and making it obvious in the DOM.
if (style.tagName.toLowerCase() === "style") {
style.innerText = content;
}
if (!style.sheet) {
throw Error(
"taler-presence-stylesheet should be a style sheet (<link> or <style>)",
);
}
sheet = style.sheet as CSSStyleSheet;
while (sheet.cssRules.length > 0) {
sheet.deleteRule(0);
}
}
}
function setStyles(installed: boolean): void {
if (!sheet || !sheet.cssRules) {
return;
}
while (sheet.cssRules.length > 0) {
sheet.deleteRule(0);
}
if (installed) {
sheet.insertRule(".taler-installed-hide { display: none; }", 0);
sheet.insertRule(".taler-probed-hide { display: none; }", 0);
} else {
sheet.insertRule(".taler-installed-show { display: none; }", 0);
}
}
function onceOnComplete(cb: () => void): void {
if (document.readyState === "complete") {
cb();
} else {
document.addEventListener("readystatechange", () => {
if (document.readyState === "complete") {
cb();
}
});
}
}
function init(): void {
onceOnComplete(() => {
if (document.documentElement.getAttribute("data-taler-nojs")) {
initStyle();
setStyles(true);
}
});
registerHandlers();
// Hack to know when the extension is unloaded
const port = chrome.runtime.connect();
port.onDisconnect.addListener(() => {
logVerbose && console.log("chrome runtime disconnected, removing handlers");
if (document.documentElement.getAttribute("data-taler-nojs")) {
setStyles(false);
}
for (const handler of handlers) {
document.removeEventListener(handler.type, handler.listener);
}
});
}
type HandlerFn = (detail: any, sendResponse: (msg: any) => void) => void;
function registerHandlers(): void {
/**
* Add a handler for a DOM event, which automatically
* handles adding sequence numbers to responses.
*/
function addHandler(type: string, handler: HandlerFn): void {
const handlerWrap = (e: Event): void => {
if (!(e instanceof Event)) {
console.log("unexpected event", e);
throw Error(`invariant violated`);
}
if (e.type !== type) {
console.log("unexpected event type", e);
throw Error(`invariant violated`);
}
let callId: number | undefined;
let detail;
if (
e instanceof CustomEvent &&
e.detail &&
e.detail.callId !== undefined
) {
callId = e.detail.callId;
detail = e.detail;
}
const responder = (msg?: any): void => {
const fullMsg = Object.assign({}, msg, { callId });
let opts = { detail: fullMsg };
if ("function" === typeof cloneInto) {
opts = cloneInto(opts, document.defaultView);
}
const evt = new CustomEvent(type + "-result", opts);
document.dispatchEvent(evt);
};
handler(detail, responder);
};
document.addEventListener(type, handlerWrap);
handlers.push({ type, listener: handlerWrap });
}
addHandler("taler-query-id", (msg: any, sendResponse: any) => {
// FIXME: maybe include this info in taler-probe?
sendResponse({ id: chrome.runtime.id });
});
addHandler("taler-probe", (msg: any, sendResponse: any) => {
sendResponse();
});
addHandler("taler-create-reserve", (msg: any) => {
const uri = new URL(
chrome.extension.getURL("/src/webex/pages/confirm-create-reserve.html"),
);
uri.searchParams.set("amount", JSON.stringify(msg.amount));
uri.searchParams.set("bank_url", document.location.href);
uri.searchParams.set(
"callback_url",
new URL(msg.callback_url, document.location.href).href,
);
uri.searchParams.set("suggested_exchange_url", msg.suggested_exchange_url);
uri.searchParams.set("wt_types", JSON.stringify(msg.wt_types));
window.location.href = uri.href;
});
addHandler("taler-add-auditor", (msg: any) => {
const uri = new URL(
chrome.extension.getURL("/src/webex/pages/add-auditor.html"),
);
uri.searchParams.set("req", JSON.stringify(msg));
window.location.href = uri.href;
});
addHandler("taler-confirm-reserve", async (msg: any, sendResponse: any) => {
const reservePub = msg.reserve_pub;
if (typeof reservePub !== "string") {
console.error(
"taler-confirm-reserve expects parameter reserve_pub of type 'string'",
);
return;
}
await wxApi.confirmReserve(msg.reserve_pub);
sendResponse();
});
}
logVerbose && console.log("loading Taler content script");
init();
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