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/*
This file is part of GNU Taler
(C) 2019 Taler Systems S.A.
GNU 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.
GNU 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
GNU Taler; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
import { InternalWalletState } from "./state";
import { parseTipUri } from "../util/taleruri";
import { PrepareTipResult, TalerErrorDetails } from "../types/walletTypes";
import {
TipPlanchetDetail,
codecForTipPickupGetResponse,
codecForTipResponse,
} from "../types/talerTypes";
import * as Amounts from "../util/amounts";
import {
Stores,
TipPlanchet,
CoinRecord,
CoinSourceType,
CoinStatus,
} from "../types/dbTypes";
import {
getExchangeWithdrawalInfo,
selectWithdrawalDenoms,
denomSelectionInfoToState,
} from "./withdraw";
import { updateExchangeFromUrl } from "./exchanges";
import { getRandomBytes, encodeCrock } from "../crypto/talerCrypto";
import { guardOperationException, makeErrorDetails } from "./errors";
import { NotificationType } from "../types/notifications";
import { getTimestampNow } from "../util/time";
import {
getHttpResponseErrorDetails,
readSuccessResponseJsonOrThrow,
} from "../util/http";
import { URL } from "../util/url";
import { Logger } from "../util/logging";
import { checkDbInvariant } from "../util/invariants";
import { TalerErrorCode } from "../TalerErrorCode";
import { initRetryInfo, updateRetryInfoTimeout } from "../util/retries";
import { j2s } from "../util/helpers";
const logger = new Logger("operations/tip.ts");
export async function prepareTip(
ws: InternalWalletState,
talerTipUri: string,
): Promise<PrepareTipResult> {
const res = parseTipUri(talerTipUri);
if (!res) {
throw Error("invalid taler://tip URI");
}
let tipRecord = await ws.db.getIndexed(
Stores.tips.byMerchantTipIdAndBaseUrl,
[res.merchantTipId, res.merchantBaseUrl],
);
if (!tipRecord) {
const tipStatusUrl = new URL(
`tips/${res.merchantTipId}`,
res.merchantBaseUrl,
);
logger.trace("checking tip status from", tipStatusUrl.href);
const merchantResp = await ws.http.get(tipStatusUrl.href);
const tipPickupStatus = await readSuccessResponseJsonOrThrow(
merchantResp,
codecForTipPickupGetResponse(),
);
logger.trace(`status ${j2s(tipPickupStatus)}`);
const amount = Amounts.parseOrThrow(tipPickupStatus.tip_amount);
logger.trace("new tip, creating tip record");
await updateExchangeFromUrl(ws, tipPickupStatus.exchange_url);
const withdrawDetails = await getExchangeWithdrawalInfo(
ws,
tipPickupStatus.exchange_url,
amount,
);
const walletTipId = encodeCrock(getRandomBytes(32));
const selectedDenoms = await selectWithdrawalDenoms(
ws,
tipPickupStatus.exchange_url,
amount,
);
tipRecord = {
walletTipId: walletTipId,
acceptedTimestamp: undefined,
tipAmountRaw: amount,
tipExpiration: tipPickupStatus.expiration,
exchangeBaseUrl: tipPickupStatus.exchange_url,
merchantBaseUrl: res.merchantBaseUrl,
planchets: undefined,
createdTimestamp: getTimestampNow(),
merchantTipId: res.merchantTipId,
tipAmountEffective: Amounts.sub(
amount,
Amounts.add(withdrawDetails.overhead, withdrawDetails.withdrawFee)
.amount,
).amount,
retryInfo: initRetryInfo(),
lastError: undefined,
denomsSel: denomSelectionInfoToState(selectedDenoms),
pickedUpTimestamp: undefined,
};
await ws.db.put(Stores.tips, tipRecord);
}
const tipStatus: PrepareTipResult = {
accepted: !!tipRecord && !!tipRecord.acceptedTimestamp,
tipAmountRaw: Amounts.stringify(tipRecord.tipAmountRaw),
exchangeBaseUrl: tipRecord.exchangeBaseUrl,
merchantBaseUrl: tipRecord.merchantBaseUrl,
expirationTimestamp: tipRecord.tipExpiration,
tipAmountEffective: Amounts.stringify(tipRecord.tipAmountEffective),
walletTipId: tipRecord.walletTipId,
};
return tipStatus;
}
async function incrementTipRetry(
ws: InternalWalletState,
walletTipId: string,
err: TalerErrorDetails | undefined,
): Promise<void> {
await ws.db.runWithWriteTransaction([Stores.tips], async (tx) => {
const t = await tx.get(Stores.tips, walletTipId);
if (!t) {
return;
}
if (!t.retryInfo) {
return;
}
t.retryInfo.retryCounter++;
updateRetryInfoTimeout(t.retryInfo);
t.lastError = err;
await tx.put(Stores.tips, t);
});
if (err) {
ws.notify({ type: NotificationType.TipOperationError, error: err });
}
}
export async function processTip(
ws: InternalWalletState,
tipId: string,
forceNow = false,
): Promise<void> {
const onOpErr = (e: TalerErrorDetails): Promise<void> =>
incrementTipRetry(ws, tipId, e);
await guardOperationException(
() => processTipImpl(ws, tipId, forceNow),
onOpErr,
);
}
async function resetTipRetry(
ws: InternalWalletState,
tipId: string,
): Promise<void> {
await ws.db.mutate(Stores.tips, tipId, (x) => {
if (x.retryInfo.active) {
x.retryInfo = initRetryInfo();
}
return x;
});
}
async function processTipImpl(
ws: InternalWalletState,
walletTipId: string,
forceNow: boolean,
): Promise<void> {
if (forceNow) {
await resetTipRetry(ws, walletTipId);
}
let tipRecord = await ws.db.get(Stores.tips, walletTipId);
if (!tipRecord) {
return;
}
if (tipRecord.pickedUpTimestamp) {
logger.warn("tip already picked up");
return;
}
const denomsForWithdraw = tipRecord.denomsSel;
if (!tipRecord.planchets) {
const planchets: TipPlanchet[] = [];
for (const sd of denomsForWithdraw.selectedDenoms) {
const denom = await ws.db.get(Stores.denominations, [
tipRecord.exchangeBaseUrl,
sd.denomPubHash,
]);
if (!denom) {
throw Error("denom does not exist anymore");
}
for (let i = 0; i < sd.count; i++) {
const r = await ws.cryptoApi.createTipPlanchet(denom);
planchets.push(r);
}
}
await ws.db.mutate(Stores.tips, walletTipId, (r) => {
if (!r.planchets) {
r.planchets = planchets;
}
return r;
});
}
tipRecord = await ws.db.get(Stores.tips, walletTipId);
checkDbInvariant(!!tipRecord, "tip record should be in database");
checkDbInvariant(!!tipRecord.planchets, "tip record should have planchets");
// Planchets in the form that the merchant expects
const planchetsDetail: TipPlanchetDetail[] = tipRecord.planchets.map((p) => ({
coin_ev: p.coinEv,
denom_pub_hash: p.denomPubHash,
}));
const tipStatusUrl = new URL(
`tips/${tipRecord.merchantTipId}/pickup`,
tipRecord.merchantBaseUrl,
);
const req = { planchets: planchetsDetail };
const merchantResp = await ws.http.postJson(tipStatusUrl.href, req);
// Hide transient errors.
if (
tipRecord.retryInfo.retryCounter < 5 &&
merchantResp.status >= 500 &&
merchantResp.status <= 599
) {
const err = makeErrorDetails(
TalerErrorCode.WALLET_UNEXPECTED_REQUEST_ERROR,
"tip pickup failed (transient)",
getHttpResponseErrorDetails(merchantResp),
);
await incrementTipRetry(ws, tipRecord.walletTipId, err);
// FIXME: Maybe we want to signal to the caller that the transient error happened?
return;
}
const response = await readSuccessResponseJsonOrThrow(
merchantResp,
codecForTipResponse(),
);
if (response.blind_sigs.length !== tipRecord.planchets.length) {
throw Error("number of tip responses does not match requested planchets");
}
const newCoinRecords: CoinRecord[] = [];
for (let i = 0; i < response.blind_sigs.length; i++) {
const blindedSig = response.blind_sigs[i].blind_sig;
const planchet = tipRecord.planchets[i];
const denomSig = await ws.cryptoApi.rsaUnblind(
blindedSig,
planchet.blindingKey,
planchet.denomPub,
);
const isValid = await ws.cryptoApi.rsaVerify(
planchet.coinPub,
denomSig,
planchet.denomPub,
);
if (!isValid) {
await ws.db.runWithWriteTransaction([Stores.tips], async (tx) => {
const tipRecord = await tx.get(Stores.tips, walletTipId);
if (!tipRecord) {
return;
}
tipRecord.lastError = makeErrorDetails(
TalerErrorCode.WALLET_TIPPING_COIN_SIGNATURE_INVALID,
"invalid signature from the exchange (via merchant tip) after unblinding",
{},
);
await tx.put(Stores.tips, tipRecord);
});
return;
}
newCoinRecords.push({
blindingKey: planchet.blindingKey,
coinPriv: planchet.coinPriv,
coinPub: planchet.coinPub,
coinSource: {
type: CoinSourceType.Tip,
coinIndex: i,
walletTipId: walletTipId,
},
currentAmount: planchet.coinValue,
denomPub: planchet.denomPub,
denomPubHash: planchet.denomPubHash,
denomSig: denomSig,
exchangeBaseUrl: tipRecord.exchangeBaseUrl,
status: CoinStatus.Fresh,
suspended: false,
});
}
await ws.db.runWithWriteTransaction(
[Stores.coins, Stores.tips, Stores.withdrawalGroups],
async (tx) => {
const tr = await tx.get(Stores.tips, walletTipId);
if (!tr) {
return;
}
if (tr.pickedUpTimestamp) {
return;
}
tr.pickedUpTimestamp = getTimestampNow();
tr.lastError = undefined;
tr.retryInfo = initRetryInfo(false);
await tx.put(Stores.tips, tr);
for (const cr of newCoinRecords) {
await tx.put(Stores.coins, cr);
}
},
);
}
export async function acceptTip(
ws: InternalWalletState,
tipId: string,
): Promise<void> {
const tipRecord = await ws.db.get(Stores.tips, tipId);
if (!tipRecord) {
logger.error("tip not found");
return;
}
tipRecord.acceptedTimestamp = getTimestampNow();
await ws.db.put(Stores.tips, tipRecord);
await processTip(ws, tipId);
return;
}
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