/*
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
*/
/**
* Script that is injected into (all!) pages to allow them
* to interact with the GNU Taler wallet via DOM Events.
*
* @author Florian Dold
*/
"use strict";
declare var cloneInto: any;
// Make sure we don't pollute the namespace too much.
namespace TalerNotify {
const PROTOCOL_VERSION = 1;
let logVerbose: boolean = false;
try {
logVerbose = !!localStorage.getItem("taler-log-verbose");
} catch (e) {
// can't read from local storage
}
if (!taler) {
console.error("Taler wallet lib not included, HTTP 402 payments not" +
" supported");
}
if (document.documentElement.getAttribute("data-taler-nojs")) {
document.dispatchEvent(new Event("taler-probe-result"));
}
function subst(url: string, H_contract: string) {
url = url.replace("${H_contract}", H_contract);
url = url.replace("${$}", "$");
return url;
}
interface Handler {
type: string;
listener: (e: CustomEvent) => void|Promise;
}
const handlers: Handler[] = [];
function hashContract(contract: string): Promise {
let walletHashContractMsg = {
type: "hash-contract",
detail: {contract}
};
return new Promise((resolve, reject) => {
chrome.runtime.sendMessage(walletHashContractMsg, (resp: any) => {
if (!resp.hash) {
console.log("error", resp);
reject(Error("hashing failed"));
}
resolve(resp.hash);
});
});
}
function checkRepurchase(contract: string): Promise {
const walletMsg = {
type: "check-repurchase",
detail: {
contract: contract
},
};
return new Promise((resolve, reject) => {
chrome.runtime.sendMessage(walletMsg, (resp: any) => {
resolve(resp);
});
});
}
function putHistory(historyEntry: any): Promise {
const walletMsg = {
type: "put-history-entry",
detail: {
historyEntry,
},
};
return new Promise((resolve, reject) => {
chrome.runtime.sendMessage(walletMsg, (resp: any) => {
resolve();
});
});
}
function saveOffer(offer: any): Promise {
const walletMsg = {
type: "save-offer",
detail: {
offer: {
contract: offer.contract,
merchant_sig: offer.merchant_sig,
H_contract: offer.H_contract,
offer_time: new Date().getTime() / 1000
},
},
};
return new Promise((resolve, reject) => {
chrome.runtime.sendMessage(walletMsg, (resp: any) => {
resolve(resp);
});
});
}
function init() {
chrome.runtime.sendMessage({type: "get-tab-cookie"}, (resp) => {
if (chrome.runtime.lastError) {
logVerbose && console.log("extension not yet ready");
window.setTimeout(init, 200);
return;
}
registerHandlers();
// Hack to know when the extension is unloaded
let port = chrome.runtime.connect();
port.onDisconnect.addListener(() => {
logVerbose && console.log("chrome runtime disconnected, removing handlers");
for (let handler of handlers) {
document.removeEventListener(handler.type, handler.listener);
}
});
if (resp && resp.type === "fetch") {
logVerbose && console.log("it's fetch");
taler.internalOfferContractFrom(resp.contractUrl);
document.documentElement.style.visibility = "hidden";
} else if (resp && resp.type === "execute") {
logVerbose && console.log("it's execute");
document.documentElement.style.visibility = "hidden";
taler.internalExecutePayment(resp.contractHash,
resp.payUrl,
resp.offerUrl);
}
});
}
logVerbose && console.log("loading Taler content script");
init();
interface HandlerFn {
(detail: any, sendResponse: (msg: any) => void): void;
}
function registerHandlers() {
/**
* Add a handler for a DOM event, which automatically
* handles adding sequence numbers to responses.
*/
function addHandler(type: string, handler: HandlerFn) {
let handlerWrap = (e: CustomEvent) => {
if (e.type != type) {
throw Error(`invariant violated`);
}
let callId: number|undefined = undefined;
if (e.detail && e.detail.callId != undefined) {
callId = e.detail.callId;
}
let responder = (msg?: any) => {
let fullMsg = Object.assign({}, msg, {callId});
let opts = { detail: fullMsg };
if ("function" == typeof cloneInto) {
opts = cloneInto(opts, document.defaultView);
}
let evt = new CustomEvent(type + "-result", opts);
document.dispatchEvent(evt);
};
handler(e.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 taoer-probe?
sendResponse({id: chrome.runtime.id})
});
addHandler("taler-probe", (msg: any, sendResponse: any) => {
sendResponse();
});
addHandler("taler-create-reserve", (msg: any) => {
let params = {
amount: JSON.stringify(msg.amount),
callback_url: URI(msg.callback_url)
.absoluteTo(document.location.href),
bank_url: document.location.href,
wt_types: JSON.stringify(msg.wt_types),
suggested_exchange_url: msg.suggested_exchange_url,
};
let uri = URI(chrome.extension.getURL("/src/pages/confirm-create-reserve.html"));
let redirectUrl = uri.query(params).href();
window.location.href = redirectUrl;
});
addHandler("taler-confirm-reserve", (msg: any, sendResponse: any) => {
let walletMsg = {
type: "confirm-reserve",
detail: {
reservePub: msg.reserve_pub
}
};
chrome.runtime.sendMessage(walletMsg, (resp) => {
sendResponse();
});
});
addHandler("taler-confirm-contract", async(msg: any) => {
if (!msg.contract_wrapper) {
console.error("contract wrapper missing");
return;
}
const offer = msg.contract_wrapper;
if (!offer.contract) {
console.error("contract field missing");
return;
}
if (!offer.H_contract) {
console.error("H_contract field missing");
return;
}
let walletHashContractMsg = {
type: "hash-contract",
detail: {contract: offer.contract}
};
let contractHash = await hashContract(offer.contract);
if (contractHash != offer.H_contract) {
console.error("merchant-supplied contract hash is wrong");
return;
}
let resp = await checkRepurchase(offer.contract);
if (resp.error) {
console.error("wallet backend error", resp);
return;
}
if (resp.isRepurchase) {
logVerbose && console.log("doing repurchase");
console.assert(resp.existingFulfillmentUrl);
console.assert(resp.existingContractHash);
window.location.href = subst(resp.existingFulfillmentUrl,
resp.existingContractHash);
} else {
let merchantName = "(unknown)";
try {
merchantName = offer.contract.merchant.name;
} catch (e) {
// bad contract / name not included
}
let historyEntry = {
timestamp: (new Date).getTime(),
subjectId: `contract-${contractHash}`,
type: "offer-contract",
detail: {
contractHash,
merchantName,
}
};
await putHistory(historyEntry);
let offerId = await saveOffer(offer);
const uri = URI(chrome.extension.getURL(
"/src/pages/confirm-contract.html"));
const params = {
offerId: offerId.toString(),
};
const target = uri.query(params).href();
if (msg.replace_navigation === true) {
document.location.replace(target);
} else {
document.location.href = target;
}
}
});
addHandler("taler-payment-failed", (msg: any, sendResponse: any) => {
const walletMsg = {
type: "payment-failed",
detail: {
contractHash: msg.H_contract
},
};
chrome.runtime.sendMessage(walletMsg, (resp) => {
sendResponse();
})
});
addHandler("taler-payment-succeeded", (msg: any, sendResponse: any) => {
if (!msg.H_contract) {
console.error("H_contract missing in taler-payment-succeeded");
return;
}
logVerbose && console.log("got taler-payment-succeeded");
const walletMsg = {
type: "payment-succeeded",
detail: {
contractHash: msg.H_contract,
},
};
chrome.runtime.sendMessage(walletMsg, (resp) => {
sendResponse();
})
});
addHandler("taler-get-payment", (msg: any, sendResponse: any) => {
const walletMsg = {
type: "execute-payment",
detail: {
H_contract: msg.H_contract,
},
};
chrome.runtime.sendMessage(walletMsg, (resp) => {
if (resp.rateLimitExceeded) {
console.error("rate limit exceeded, check for redirect loops");
}
if (!resp.success) {
if (msg.offering_url) {
window.location.href = msg.offering_url;
} else {
console.error("execute-payment failed", resp);
}
return;
}
let contract = resp.contract;
if (!contract) {
throw Error("contract missing");
}
// We have the details for then payment, the merchant page
// is responsible to give it to the merchant.
sendResponse({
H_contract: msg.H_contract,
contract: resp.contract,
payment: resp.payReq,
});
});
});
}
}