1 files changed, 246 insertions, 0 deletions
diff --git a/src/wallet-impl/tip.ts b/src/wallet-impl/tip.ts
new file mode 100644
index 000000000..b102d026f
--- /dev/null
+++ b/src/wallet-impl/tip.ts
@@ -0,0 +1,246 @@
+/*
+ This file is part of GNU Taler
+ (C) 2019 GNUnet e.V.
+
+ 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 { oneShotGet, oneShotPut, oneShotMutate, runWithWriteTransaction } from "../util/query";
+import { InternalWalletState } from "./state";
+import { parseTipUri } from "../util/taleruri";
+import { TipStatus, getTimestampNow } from "../walletTypes";
+import { TipPickupGetResponse, TipPlanchetDetail, TipResponse } from "../talerTypes";
+import * as Amounts from "../util/amounts";
+import { Stores, PlanchetRecord, WithdrawalSessionRecord } from "../dbTypes";
+import { getWithdrawDetailsForAmount, getVerifiedWithdrawDenomList, processWithdrawSession } from "./withdraw";
+import { getTalerStampSec } from "../util/helpers";
+import { updateExchangeFromUrl } from "./exchanges";
+import { getRandomBytes, encodeCrock } from "../crypto/talerCrypto";
+
+
+export async function getTipStatus(
+  ws: InternalWalletState,
+  talerTipUri: string): Promise<TipStatus> {
+  const res = parseTipUri(talerTipUri);
+  if (!res) {
+    throw Error("invalid taler://tip URI");
+  }
+
+  const tipStatusUrl = new URL("tip-pickup", res.merchantBaseUrl);
+  tipStatusUrl.searchParams.set("tip_id", res.merchantTipId);
+  console.log("checking tip status from", tipStatusUrl.href);
+  const merchantResp = await ws.http.get(tipStatusUrl.href);
+  console.log("resp:", merchantResp.responseJson);
+  const tipPickupStatus = TipPickupGetResponse.checked(
+    merchantResp.responseJson,
+  );
+
+  console.log("status", tipPickupStatus);
+
+  let amount = Amounts.parseOrThrow(tipPickupStatus.amount);
+
+  let tipRecord = await oneShotGet(ws.db, Stores.tips, [
+    res.merchantTipId,
+    res.merchantOrigin,
+  ]);
+
+  if (!tipRecord) {
+    const withdrawDetails = await getWithdrawDetailsForAmount(
+      ws,
+      tipPickupStatus.exchange_url,
+      amount,
+    );
+
+    const tipId = encodeCrock(getRandomBytes(32));
+
+    tipRecord = {
+      tipId,
+      accepted: false,
+      amount,
+      deadline: getTalerStampSec(tipPickupStatus.stamp_expire)!,
+      exchangeUrl: tipPickupStatus.exchange_url,
+      merchantBaseUrl: res.merchantBaseUrl,
+      nextUrl: undefined,
+      pickedUp: false,
+      planchets: undefined,
+      response: undefined,
+      timestamp: getTimestampNow(),
+      merchantTipId: res.merchantTipId,
+      totalFees: Amounts.add(
+        withdrawDetails.overhead,
+        withdrawDetails.withdrawFee,
+      ).amount,
+    };
+    await oneShotPut(ws.db, Stores.tips, tipRecord);
+  }
+
+  const tipStatus: TipStatus = {
+    accepted: !!tipRecord && tipRecord.accepted,
+    amount: Amounts.parseOrThrow(tipPickupStatus.amount),
+    amountLeft: Amounts.parseOrThrow(tipPickupStatus.amount_left),
+    exchangeUrl: tipPickupStatus.exchange_url,
+    nextUrl: tipPickupStatus.extra.next_url,
+    merchantOrigin: res.merchantOrigin,
+    merchantTipId: res.merchantTipId,
+    expirationTimestamp: getTalerStampSec(tipPickupStatus.stamp_expire)!,
+    timestamp: getTalerStampSec(tipPickupStatus.stamp_created)!,
+    totalFees: tipRecord.totalFees,
+    tipId: tipRecord.tipId,
+  };
+
+  return tipStatus;
+}
+
+export async function processTip(
+  ws: InternalWalletState,
+  tipId: string,
+) {
+  let tipRecord = await oneShotGet(ws.db, Stores.tips, tipId);
+  if (!tipRecord) {
+    return;
+  }
+
+  if (tipRecord.pickedUp) {
+    console.log("tip already picked up");
+    return;
+  }
+
+  if (!tipRecord.planchets) {
+    await updateExchangeFromUrl(ws, tipRecord.exchangeUrl);
+    const denomsForWithdraw = await getVerifiedWithdrawDenomList(
+      ws,
+      tipRecord.exchangeUrl,
+      tipRecord.amount,
+    );
+
+    const planchets = await Promise.all(
+      denomsForWithdraw.map(d => ws.cryptoApi.createTipPlanchet(d)),
+    );
+
+    await oneShotMutate(ws.db, Stores.tips, tipId, r => {
+      if (!r.planchets) {
+        r.planchets = planchets;
+      }
+      return r;
+    });
+  }
+
+  tipRecord = await oneShotGet(ws.db, Stores.tips, tipId);
+  if (!tipRecord) {
+    throw Error("tip not in database");
+  }
+
+  if (!tipRecord.planchets) {
+    throw Error("invariant violated");
+  }
+
+  console.log("got planchets for tip!");
+
+  // Planchets in the form that the merchant expects
+  const planchetsDetail: TipPlanchetDetail[] = tipRecord.planchets.map(p => ({
+    coin_ev: p.coinEv,
+    denom_pub_hash: p.denomPubHash,
+  }));
+
+  let merchantResp;
+
+  const tipStatusUrl = new URL("tip-pickup", tipRecord.merchantBaseUrl);
+
+  try {
+    const req = { planchets: planchetsDetail, tip_id: tipRecord.merchantTipId };
+    merchantResp = await ws.http.postJson(tipStatusUrl.href, req);
+    console.log("got merchant resp:", merchantResp);
+  } catch (e) {
+    console.log("tipping failed", e);
+    throw e;
+  }
+
+  const response = TipResponse.checked(merchantResp.responseJson);
+
+  if (response.reserve_sigs.length !== tipRecord.planchets.length) {
+    throw Error("number of tip responses does not match requested planchets");
+  }
+
+  const planchets: PlanchetRecord[] = [];
+
+  for (let i = 0; i < tipRecord.planchets.length; i++) {
+    const tipPlanchet = tipRecord.planchets[i];
+    const planchet: PlanchetRecord = {
+      blindingKey: tipPlanchet.blindingKey,
+      coinEv: tipPlanchet.coinEv,
+      coinPriv: tipPlanchet.coinPriv,
+      coinPub: tipPlanchet.coinPub,
+      coinValue: tipPlanchet.coinValue,
+      denomPub: tipPlanchet.denomPub,
+      denomPubHash: tipPlanchet.denomPubHash,
+      reservePub: response.reserve_pub,
+      withdrawSig: response.reserve_sigs[i].reserve_sig,
+      isFromTip: true,
+    };
+    planchets.push(planchet);
+  }
+
+  const withdrawalSessionId = encodeCrock(getRandomBytes(32));
+
+  const withdrawalSession: WithdrawalSessionRecord = {
+    denoms: planchets.map((x) => x.denomPub),
+    exchangeBaseUrl: tipRecord.exchangeUrl,
+    planchets: planchets,
+    source: {
+      type: "tip",
+      tipId: tipRecord.tipId,
+    },
+    startTimestamp: getTimestampNow(),
+    withdrawSessionId: withdrawalSessionId,
+    withdrawalAmount: Amounts.toString(tipRecord.amount),
+    withdrawn: planchets.map((x) => false),
+  };
+
+
+  await runWithWriteTransaction(ws.db, [Stores.tips, Stores.withdrawalSession], async (tx) => {
+    const tr = await tx.get(Stores.tips, tipId);
+    if (!tr) {
+      return;
+    }
+    if (tr.pickedUp) {
+      return;
+    }
+    tr.pickedUp = true;
+
+    await tx.put(Stores.tips, tr);
+    await tx.put(Stores.withdrawalSession, withdrawalSession);
+  });
+
+  await processWithdrawSession(ws, withdrawalSessionId);
+
+  ws.notifier.notify();
+  ws.badge.showNotification();
+  return;
+}
+
+export async function acceptTip(
+  ws: InternalWalletState,
+  tipId: string,
+): Promise<void> {
+  const tipRecord = await oneShotGet(ws.db, Stores.tips, tipId);
+  if (!tipRecord) {
+    console.log("tip not found");
+    return;
+  }
+
+  tipRecord.accepted = true;
+  await oneShotPut(ws.db, Stores.tips, tipRecord);
+
+  await processTip(ws, tipId);
+  return;
+}