aboutsummaryrefslogtreecommitdiff
path: root/extension/background/wallet.js
blob: cc2154a8a75a6565c230161aedaf0f8efdc842f6 (plain)
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
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
/*
 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, If not, see <http://www.gnu.org/licenses/>
 */
/**
 * High-level wallet operations that should be indepentent from the underlying
 * browser extension interface.
 * @module Wallet
 * @author Florian Dold
 */
/// <reference path="../decl/urijs/URIjs.d.ts" />
"use strict";
var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
    var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
    if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
    else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
    return c > 3 && r && Object.defineProperty(target, key, r), r;
};
let AmountJson = class {
};
__decorate([
    Checkable.Number
], AmountJson.prototype, "value", void 0);
__decorate([
    Checkable.Number
], AmountJson.prototype, "fraction", void 0);
__decorate([
    Checkable.String
], AmountJson.prototype, "currency", void 0);
AmountJson = __decorate([
    Checkable.Class
], AmountJson);
let CoinPaySig = class {
};
__decorate([
    Checkable.String
], CoinPaySig.prototype, "coin_sig", void 0);
__decorate([
    Checkable.String
], CoinPaySig.prototype, "coin_pub", void 0);
__decorate([
    Checkable.String
], CoinPaySig.prototype, "ub_sig", void 0);
__decorate([
    Checkable.String
], CoinPaySig.prototype, "denom_pub", void 0);
__decorate([
    Checkable.Value(AmountJson)
], CoinPaySig.prototype, "f", void 0);
CoinPaySig = __decorate([
    Checkable.Class
], CoinPaySig);
/**
 * See http://api.taler.net/wallet.html#general
 */
function canonicalizeBaseUrl(url) {
    let x = new URI(url);
    if (!x.protocol()) {
        x.protocol("https");
    }
    x.path(x.path() + "/").normalizePath();
    x.fragment();
    x.query();
    return x.href();
}
function copy(o) {
    return JSON.parse(JSON.stringify(o));
}
function rankDenom(denom1, denom2) {
    // Slow ... we should find a better way than to convert it evert time.
    let v1 = new Amount(denom1.value);
    let v2 = new Amount(denom2.value);
    return (-1) * v1.cmp(v2);
}
class Wallet {
    constructor(db, http, badge) {
        this.db = db;
        this.http = http;
        this.badge = badge;
    }
    static signDeposit(offer, cds) {
        let ret = [];
        let amountSpent = Amount.getZero(cds[0].coin.currentAmount.currency);
        let amountRemaining = new Amount(offer.contract.amount);
        cds = copy(cds);
        for (let cd of cds) {
            let coinSpend;
            if (amountRemaining.value == 0 && amountRemaining.fraction == 0) {
                break;
            }
            if (amountRemaining.cmp(new Amount(cd.coin.currentAmount)) < 0) {
                coinSpend = new Amount(amountRemaining.toJson());
            }
            else {
                coinSpend = new Amount(cd.coin.currentAmount);
            }
            amountSpent.add(coinSpend);
            amountRemaining.sub(coinSpend);
            let newAmount = new Amount(cd.coin.currentAmount);
            newAmount.sub(coinSpend);
            cd.coin.currentAmount = newAmount.toJson();
            let args = {
                h_contract: HashCode.fromCrock(offer.H_contract),
                h_wire: HashCode.fromCrock(offer.contract.H_wire),
                amount_with_fee: coinSpend.toNbo(),
                coin_pub: EddsaPublicKey.fromCrock(cd.coin.coinPub),
                deposit_fee: new Amount(cd.denom.fee_deposit).toNbo(),
                merchant: EddsaPublicKey.fromCrock(offer.contract.merchant_pub),
                refund_deadline: AbsoluteTimeNbo.fromTalerString(offer.contract.refund_deadline),
                timestamp: AbsoluteTimeNbo.fromTalerString(offer.contract.timestamp),
                transaction_id: UInt64.fromNumber(offer.contract.transaction_id),
            };
            let d = new DepositRequestPS(args);
            let coinSig = eddsaSign(d.toPurpose(), EddsaPrivateKey.fromCrock(cd.coin.coinPriv))
                .toCrock();
            let s = {
                coin_sig: coinSig,
                coin_pub: cd.coin.coinPub,
                ub_sig: cd.coin.denomSig,
                denom_pub: cd.coin.denomPub,
                f: coinSpend.toJson(),
            };
            ret.push({ sig: s, updatedCoin: cd.coin });
        }
        return ret;
    }
    /**
     * Get mints and associated coins that are still spendable,
     * but only if the sum the coins' remaining value exceeds the payment amount.
     * @param paymentAmount
     * @param depositFeeLimit
     * @param allowedMints
     */
    getPossibleMintCoins(paymentAmount, depositFeeLimit, allowedMints) {
        let m = {};
        function storeMintCoin(mc) {
            let mint = mc[0];
            let coin = mc[1];
            let cd = {
                coin: coin,
                denom: mint.keys.denoms.find((e) => e.denom_pub === coin.denomPub)
            };
            if (!cd.denom) {
                throw Error("denom not found (database inconsistent)");
            }
            let x = m[mint.baseUrl];
            if (!x) {
                m[mint.baseUrl] = [cd];
            }
            else {
                x.push(cd);
            }
        }
        let ps = allowedMints.map((info) => {
            return Query(this.db)
                .iterIndex("mints", "pubKey", info.master_pub)
                .indexJoin("coins", "mintBaseUrl", (mint) => mint.baseUrl)
                .reduce(storeMintCoin);
        });
        return Promise.all(ps).then(() => {
            let ret = {};
            nextMint: for (let key in m) {
                let coins = m[key].map((x) => ({
                    a: new Amount(x.denom.fee_deposit),
                    c: x
                }));
                // Sort by ascending deposit fee
                coins.sort((o1, o2) => o1.a.cmp(o2.a));
                let maxFee = new Amount(depositFeeLimit);
                let minAmount = new Amount(paymentAmount);
                let accFee = new Amount(coins[0].c.denom.fee_deposit);
                let accAmount = Amount.getZero(coins[0].c.coin.currentAmount.currency);
                let usableCoins = [];
                nextCoin: for (let i = 0; i < coins.length; i++) {
                    let coinAmount = new Amount(coins[i].c.coin.currentAmount);
                    let coinFee = coins[i].a;
                    if (coinAmount.cmp(coinFee) <= 0) {
                        continue nextCoin;
                    }
                    accFee.add(coinFee);
                    accAmount.add(coinAmount);
                    if (accFee.cmp(maxFee) >= 0) {
                        console.log("too much fees");
                        continue nextMint;
                    }
                    usableCoins.push(coins[i].c);
                    if (accAmount.cmp(minAmount) >= 0) {
                        ret[key] = usableCoins;
                        continue nextMint;
                    }
                }
            }
            return ret;
        });
    }
    executePay(offer, payCoinInfo, merchantBaseUrl, chosenMint) {
        let payReq = {};
        payReq["H_wire"] = offer.contract.H_wire;
        payReq["H_contract"] = offer.H_contract;
        payReq["transaction_id"] = offer.contract.transaction_id;
        payReq["refund_deadline"] = offer.contract.refund_deadline;
        payReq["mint"] = URI(chosenMint).href();
        payReq["coins"] = payCoinInfo.map((x) => x.sig);
        payReq["timestamp"] = offer.contract.timestamp;
        let payUrl = URI(offer.pay_url).absoluteTo(merchantBaseUrl);
        let t = {
            contractHash: offer.H_contract,
            contract: offer.contract,
            payUrl: payUrl.href(),
            payReq: payReq
        };
        return Query(this.db)
            .put("transactions", t)
            .putAll("coins", payCoinInfo.map((pci) => pci.updatedCoin))
            .finish();
    }
    confirmPay(offer, merchantPageUrl) {
        return Promise.resolve().then(() => {
            return this.getPossibleMintCoins(offer.contract.amount, offer.contract.max_fee, offer.contract.mints);
        }).then((mcs) => {
            if (Object.keys(mcs).length == 0) {
                throw Error("Not enough coins.");
            }
            let mintUrl = Object.keys(mcs)[0];
            let ds = Wallet.signDeposit(offer, mcs[mintUrl]);
            return this.executePay(offer, ds, merchantPageUrl, mintUrl);
        });
    }
    doPayment(H_contract) {
        return Promise.resolve().then(() => {
            return Query(this.db)
                .get("transactions", H_contract)
                .then((t) => {
                if (!t) {
                    throw Error("contract not found");
                }
                let resp = {
                    payUrl: t.payUrl,
                    payReq: t.payReq
                };
                return resp;
            });
        });
    }
    confirmReserve(req) {
        let reservePriv = EddsaPrivateKey.create();
        let reservePub = reservePriv.getPublicKey();
        let form = new FormData();
        let now = (new Date()).toString();
        form.append(req.field_amount, req.amount_str);
        form.append(req.field_reserve_pub, reservePub.toCrock());
        form.append(req.field_mint, req.mint);
        // TODO: set bank-specified fields.
        let mintBaseUrl = canonicalizeBaseUrl(req.mint);
        return this.http.postForm(req.post_url, form)
            .then((hresp) => {
            let resp = {
                status: hresp.status,
                text: hresp.responseText,
                success: undefined,
                backlink: undefined
            };
            let reserveRecord = {
                reserve_pub: reservePub.toCrock(),
                reserve_priv: reservePriv.toCrock(),
                mint_base_url: mintBaseUrl,
                created: now,
                last_query: null,
                current_amount: null,
                // XXX: set to actual amount
                initial_amount: null
            };
            if (hresp.status != 200) {
                resp.success = false;
                return resp;
            }
            resp.success = true;
            // We can't show the page directly, so
            // we show some generic page from the wallet.
            resp.backlink = null;
            return Query(this.db)
                .put("reserves", reserveRecord)
                .finish()
                .then(() => {
                // Do this in the background
                this.updateMintFromUrl(reserveRecord.mint_base_url)
                    .then((mint) => this.updateReserve(reservePub, mint)
                    .then((reserve) => this.depleteReserve(reserve, mint)));
                return resp;
            });
        });
    }
    withdrawPrepare(denom, reserve) {
        let reservePriv = new EddsaPrivateKey();
        reservePriv.loadCrock(reserve.reserve_priv);
        let reservePub = new EddsaPublicKey();
        reservePub.loadCrock(reserve.reserve_pub);
        let denomPub = RsaPublicKey.fromCrock(denom.denom_pub);
        let coinPriv = EddsaPrivateKey.create();
        let coinPub = coinPriv.getPublicKey();
        let blindingFactor = RsaBlindingKey.create(1024);
        let pubHash = coinPub.hash();
        let ev = rsaBlind(pubHash, blindingFactor, denomPub);
        if (!denom.fee_withdraw) {
            throw Error("Field fee_withdraw missing");
        }
        let amountWithFee = new Amount(denom.value);
        amountWithFee.add(new Amount(denom.fee_withdraw));
        let withdrawFee = new Amount(denom.fee_withdraw);
        // Signature
        let withdrawRequest = new WithdrawRequestPS({
            reserve_pub: reservePub,
            amount_with_fee: amountWithFee.toNbo(),
            withdraw_fee: withdrawFee.toNbo(),
            h_denomination_pub: denomPub.encode().hash(),
            h_coin_envelope: ev.hash()
        });
        var sig = eddsaSign(withdrawRequest.toPurpose(), reservePriv);
        let preCoin = {
            reservePub: reservePub.toCrock(),
            blindingKey: blindingFactor.toCrock(),
            coinPub: coinPub.toCrock(),
            coinPriv: coinPriv.toCrock(),
            denomPub: denomPub.encode().toCrock(),
            mintBaseUrl: reserve.mint_base_url,
            withdrawSig: sig.toCrock(),
            coinEv: ev.toCrock(),
            coinValue: denom.value
        };
        return Query(this.db).put("precoins", preCoin).finish().then(() => preCoin);
    }
    withdrawExecute(pc) {
        return Query(this.db)
            .get("reserves", pc.reservePub)
            .then((r) => {
            let wd = {};
            wd.denom_pub = pc.denomPub;
            wd.reserve_pub = pc.reservePub;
            wd.reserve_sig = pc.withdrawSig;
            wd.coin_ev = pc.coinEv;
            let reqUrl = URI("reserve/withdraw").absoluteTo(r.mint_base_url);
            return this.http.postJson(reqUrl, wd);
        })
            .then(resp => {
            if (resp.status != 200) {
                throw new RequestException({
                    hint: "Withdrawal failed",
                    status: resp.status
                });
            }
            let r = JSON.parse(resp.responseText);
            let denomSig = rsaUnblind(RsaSignature.fromCrock(r.ev_sig), RsaBlindingKey.fromCrock(pc.blindingKey), RsaPublicKey.fromCrock(pc.denomPub));
            let coin = {
                coinPub: pc.coinPub,
                coinPriv: pc.coinPriv,
                denomPub: pc.denomPub,
                denomSig: denomSig.encode().toCrock(),
                currentAmount: pc.coinValue,
                mintBaseUrl: pc.mintBaseUrl,
            };
            return coin;
        });
    }
    updateBadge() {
        function countNonEmpty(c, n) {
            if (c.currentAmount.fraction != 0 || c.currentAmount.value != 0) {
                return n + 1;
            }
            return n;
        }
        function doBadge(n) {
            this.badge.setText(n.toString());
            this.badge.setColor("#0F0");
        }
        Query(this.db)
            .iter("coins")
            .reduce(countNonEmpty, 0)
            .then(doBadge);
    }
    storeCoin(coin) {
        Query(this.db)
            .delete("precoins", coin.coinPub)
            .add("coins", coin)
            .finish()
            .then(() => {
            this.updateBadge();
        });
    }
    withdraw(denom, reserve) {
        return this.withdrawPrepare(denom, reserve)
            .then((pc) => this.withdrawExecute(pc))
            .then((c) => this.storeCoin(c));
    }
    /**
     * Withdraw coins from a reserve until it is empty.
     */
    depleteReserve(reserve, mint) {
        let denoms = copy(mint.keys.denoms);
        let remaining = new Amount(reserve.current_amount);
        denoms.sort(rankDenom);
        let workList = [];
        for (let i = 0; i < 1000; i++) {
            let found = false;
            for (let d of denoms) {
                let cost = new Amount(d.value);
                cost.add(new Amount(d.fee_withdraw));
                if (remaining.cmp(cost) < 0) {
                    continue;
                }
                found = true;
                remaining.sub(cost);
                workList.push(d);
            }
            if (!found) {
                console.log("did not find coins for remaining ", remaining.toJson());
                break;
            }
        }
        // Do the request one by one.
        let next = () => {
            if (workList.length == 0) {
                return;
            }
            let d = workList.pop();
            this.withdraw(d, reserve)
                .then(() => next());
        };
        // Asynchronous recursion
        next();
    }
    updateReserve(reservePub, mint) {
        let reservePubStr = reservePub.toCrock();
        return Query(this.db)
            .get("reserves", reservePubStr)
            .then((reserve) => {
            let reqUrl = URI("reserve/status").absoluteTo(mint.baseUrl);
            reqUrl.query({ 'reserve_pub': reservePubStr });
            return this.http.get(reqUrl).then(resp => {
                if (resp.status != 200) {
                    throw Error();
                }
                let reserveInfo = JSON.parse(resp.responseText);
                if (!reserveInfo) {
                    throw Error();
                }
                reserve.current_amount = reserveInfo.balance;
                return Query(this.db)
                    .put("reserves", reserve)
                    .finish()
                    .then(() => reserve);
            });
        });
    }
    /**
     * Update or add mint DB entry by fetching the /keys information.
     * Optionally link the reserve entry to the new or existing
     * mint entry in then DB.
     */
    updateMintFromUrl(baseUrl) {
        let reqUrl = URI("keys").absoluteTo(baseUrl);
        return this.http.get(reqUrl).then((resp) => {
            if (resp.status != 200) {
                throw Error("/keys request failed");
            }
            let mintKeysJson = JSON.parse(resp.responseText);
            if (!mintKeysJson) {
                throw new RequestException({ url: reqUrl, hint: "keys invalid" });
            }
            let mint = {
                baseUrl: baseUrl,
                keys: mintKeysJson
            };
            return Query(this.db).put("mints", mint).finish().then(() => mint);
        });
    }
    getBalances() {
        function collectBalances(c, byCurrency) {
            let acc = byCurrency[c.currentAmount.currency];
            if (!acc) {
                acc = Amount.getZero(c.currentAmount.currency).toJson();
            }
            let am = new Amount(c.currentAmount);
            am.add(new Amount(acc));
            byCurrency[c.currentAmount.currency] = am.toJson();
            return byCurrency;
        }
        return Query(this.db)
            .iter("coins")
            .reduce(collectBalances, {});
    }
}