1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
|
/*
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/>
*/
/**
* 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<void>;
}
const handlers: Handler[] = [];
function hashContract(contract: string): Promise<string> {
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<any> {
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<void> {
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<number> {
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,
});
});
});
}
}
|