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|
/// <reference path="../decl/urijs/URIjs.d.ts" />
/// <reference path="../decl/chrome/chrome.d.ts" />
'use strict';
interface AmountJson {
value: number;
fraction: number;
currency: string;
}
/**
* 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()
}
interface ConfirmPayRequest {
merchantPageUrl: string;
offer: Offer;
}
interface MintCoins {
[mintUrl: string]: Db.CoinWithDenom[];
}
interface Offer {
contract: Contract;
sig: string;
H_contract: string;
pay_url: string;
exec_url: string;
}
interface Contract {
H_wire: string;
amount: AmountJson;
auditors: string[];
expiry: string,
locations: string[];
max_fee: AmountJson;
merchant: any;
merchant_pub: string;
mints: MintInfo[];
products: string[];
refund_deadline: string;
timestamp: string;
transaction_id: number;
}
interface CoinPaySig {
coin_sig: string;
coin_pub: string;
ub_sig: string;
denom_pub: string;
f: AmountJson;
}
type PayCoinInfo = Array<{ updatedCoin: Db.Coin, sig: CoinPaySig }>;
function signDeposit(db: IDBDatabase,
offer: Offer,
cds: Db.CoinWithDenom[]): PayCoinInfo {
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;
console.log("amount remaining:", amountRemaining.toJson());
if (amountRemaining.value == 0 && amountRemaining.fraction == 0) {
console.log("full amount spent");
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 d = new DepositRequestPS({
h_contract: HashCode.fromCrock(offer.H_contract),
h_wire: HashCode.fromCrock(offer.contract.H_wire),
amount_with_fee: new Amount(cd.coin.currentAmount).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 newAmount = new Amount(cd.coin.currentAmount);
newAmount.sub(coinSpend);
cd.coin.currentAmount = newAmount.toJson();
console.log("DepositRequestPS: ", d.toPurpose().hexdump());
let coinSig = eddsaSign(d.toPurpose(),
EddsaPrivateKey.fromCrock(cd.coin.coinPriv))
.toCrock();
let s: CoinPaySig = {
coin_sig: coinSig,
coin_pub: cd.coin.coinPub,
ub_sig: cd.coin.denomSig,
denom_pub: cd.coin.denomPub,
f: amountSpent.toJson(),
};
ret.push({sig: s, updatedCoin: cd.coin});
}
return ret;
}
interface MintInfo {
master_pub: string;
url: string;
}
/**
* Get mints and associated coins that are still spendable,
* but only if the sum the coins' remaining value exceeds the payment amount.
* @param db
* @param paymentAmount
* @param depositFeeLimit
* @param allowedMints
*/
function getPossibleMintCoins(db: IDBDatabase,
paymentAmount: AmountJson,
depositFeeLimit: AmountJson,
allowedMints: MintInfo[]): Promise<MintCoins> {
return new Promise((resolve, reject) => {
let m: MintCoins = {};
let found = false;
let tx = db.transaction(["mints", "coins"]);
// First pass: Get all coins from acceptable mints.
for (let info of allowedMints) {
let req_mints = tx.objectStore("mints")
.index("pubKey")
.get(info.master_pub);
req_mints.onsuccess = (e) => {
let mint: Db.Mint = req_mints.result;
if (!mint) {
throw Error("no matching mint in index");
}
let req_coins = tx.objectStore("coins")
.index("mintBaseUrl")
.openCursor(IDBKeyRange.only(mint.baseUrl));
req_coins.onsuccess = (e) => {
let cursor: IDBCursorWithValue = req_coins.result;
if (!cursor) {
return;
}
let value: Db.Coin = cursor.value;
let cd = {
coin: cursor.value,
denom: mint.keys.denoms.find((e) => e.denom_pub === value.denomPub)
};
if (!cd.denom) {
throw Error("denom not found");
}
let x = m[mint.baseUrl];
if (!x) {
m[mint.baseUrl] = [cd];
} else {
x.push(cd);
}
cursor.continue();
}
}
}
tx.oncomplete = (e) => {
let ret: MintCoins = {};
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 = new Amount(coins[0].c.coin.currentAmount);
for (let i = 0; i < coins.length; i++) {
if (accFee.cmp(maxFee) >= 0) {
continue nextMint;
}
if (accAmount.cmp(minAmount) >= 0) {
ret[key] = m[key];
continue nextMint;
}
accFee.add(coins[i].a);
accFee.add(new Amount(coins[i].c.coin.currentAmount));
}
}
resolve(ret);
};
tx.onerror = (e) => {
reject();
}
});
}
interface Transaction {
contractHash: string;
contract: any;
payUrl: string;
payReq: any;
}
function executePay(db,
offer: Offer,
payCoinInfo: PayCoinInfo,
merchantBaseUrl: string,
chosenMint: string) {
return new Promise((resolve, reject) => {
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: Transaction = {
contractHash: offer.H_contract,
contract: offer.contract,
payUrl: payUrl.href(),
payReq: payReq
};
let tx = db.transaction(['transactions'], 'readwrite');
tx.objectStore('transactions').put(t);
tx.oncomplete = (e) => {
resolve();
};
});
}
function confirmPay(db, detail: ConfirmPayRequest, sendResponse) {
console.log("confirmPay", JSON.stringify(detail));
let tx = db.transaction(['transactions'], 'readwrite');
let trans = {
contractHash: detail.offer.H_contract,
contract: detail.offer.contract,
sig: detail.offer
};
let offer: Offer = detail.offer;
getPossibleMintCoins(db,
offer.contract.amount,
offer.contract.max_fee,
offer.contract.mints)
.then((mcs) => {
if (Object.keys(mcs).length == 0) {
sendResponse({error: "Not enough coins."});
return;
}
let mintUrl = Object.keys(mcs)[0];
let ds = signDeposit(db, offer, mcs[mintUrl]);
return executePay(db, offer, ds, detail.merchantPageUrl, mintUrl);
})
.then(() => {
sendResponse({
success: true,
});
});
return true;
}
function doPayment(db, detail, sendResponse) {
let H_contract = detail.H_contract;
let req = db.transaction(['transactions']).objectStore("transactions").get(H_contract);
console.log("executing contract", H_contract);
req.onsuccess = (e) => {
if (!req.result) {
sendResponse({success: false, error: "contract not found"});
return;
}
sendResponse({success: true, payUrl: req.result.payUrl, payReq: req.result.payReq});
};
return true;
}
function confirmReserve(db, detail, sendResponse) {
let reservePriv = EddsaPrivateKey.create();
let reservePub = reservePriv.getPublicKey();
let form = new FormData();
let now = (new Date()).toString();
form.append(detail.field_amount, detail.amount_str);
form.append(detail.field_reserve_pub, reservePub.toCrock());
form.append(detail.field_mint, detail.mint);
// XXX: set bank-specified fields.
let myRequest = new XMLHttpRequest();
console.log("making request to " + detail.post_url);
myRequest.open('post', detail.post_url);
myRequest.send(form);
let mintBaseUrl = canonicalizeBaseUrl(detail.mint);
myRequest.addEventListener('readystatechange', (e) => {
if (myRequest.readyState == XMLHttpRequest.DONE) {
// TODO: extract as interface
let resp = {
status: myRequest.status,
text: myRequest.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
};
// XXX: insert into db.
switch (myRequest.status) {
case 200:
resp.success = true;
// We can't show the page directly, so
// we show some generic page from the wallet.
resp.backlink = chrome.extension.getURL("pages/reserve-success.html");
let tx = db.transaction(['reserves'], 'readwrite');
tx.objectStore('reserves').add(reserveRecord);
tx.addEventListener('complete', (e) => {
console.log('tx complete, pk was ' + reserveRecord.reserve_pub);
sendResponse(resp);
var mint;
updateMintFromUrl(db, reserveRecord.mint_base_url)
.then((m) => {
mint = m;
return updateReserve(db, reservePub, mint);
})
.then((reserve) => depleteReserve(db, reserve, mint));
});
break;
default:
resp.success = false;
sendResponse(resp);
}
}
});
// Allow async response
return true;
}
function copy(o) {
return JSON.parse(JSON.stringify(o));
}
function rankDenom(denom1: any, denom2: any) {
// 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);
}
interface Reserve {
mint_base_url: string
reserve_priv: string;
reserve_pub: string;
}
function withdrawPrepare(db: IDBDatabase,
denom: Db.Denomination,
reserve: Reserve): Promise<Db.PreCoin> {
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: HashCode = coinPub.hash();
let ev: ByteArray = 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()
});
console.log("about to sign");
var sig = eddsaSign(withdrawRequest.toPurpose(), reservePriv);
console.log("signed");
console.log("crypto done, doing request");
let preCoin: Db.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
};
console.log("storing precoin", JSON.stringify(preCoin));
let tx = db.transaction(['precoins'], 'readwrite');
tx.objectStore('precoins').add(preCoin);
return new Promise((resolve, reject) => {
tx.oncomplete = (e) => {
resolve(preCoin);
}
});
}
function dbGet(db, store: string, key: any): Promise<any> {
let tx = db.transaction([store]);
let req = tx.objectStore(store).get(key);
return new Promise((resolve, reject) => {
req.onsuccess = (e) => resolve(req.result);
});
}
function withdrawExecute(db, pc: Db.PreCoin): Promise<Db.Coin> {
return dbGet(db, 'reserves', pc.reservePub)
.then((r) => new Promise((resolve, reject) => {
console.log("loading precoin", JSON.stringify(pc));
let wd: any = {};
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);
let myRequest = new XMLHttpRequest();
console.log("making request to " + reqUrl.href());
myRequest.open('post', reqUrl.href());
myRequest.setRequestHeader("Content-Type",
"application/json;charset=UTF-8");
myRequest.send(JSON.stringify(wd));
myRequest.addEventListener('readystatechange', (e) => {
if (myRequest.readyState == XMLHttpRequest.DONE) {
if (myRequest.status != 200) {
console.log("Withdrawal failed, status ", myRequest.status);
reject();
return;
}
console.log("Withdrawal successful");
console.log(myRequest.responseText);
let resp = JSON.parse(myRequest.responseText);
let denomSig = rsaUnblind(RsaSignature.fromCrock(resp.ev_sig),
RsaBlindingKey.fromCrock(pc.blindingKey),
RsaPublicKey.fromCrock(pc.denomPub));
let coin: Db.Coin = {
coinPub: pc.coinPub,
coinPriv: pc.coinPriv,
denomPub: pc.denomPub,
denomSig: denomSig.encode().toCrock(),
currentAmount: pc.coinValue,
mintBaseUrl: pc.mintBaseUrl,
};
console.log("unblinded coin");
resolve(coin);
} else {
console.log("ready state change to", myRequest.status);
}
});
}));
}
function updateBadge(db) {
let tx = db.transaction(['coins'], 'readwrite');
let req = tx.objectStore('coins').openCursor();
let n = 0;
req.onsuccess = (e) => {
let cursor = req.result;
if (cursor) {
n++;
cursor.continue();
} else {
console.log("badge");
chrome.browserAction.setBadgeText({text: "" + n});
chrome.browserAction.setBadgeBackgroundColor({color: "#0F0"});
}
}
}
function storeCoin(db, coin: Db.Coin) {
let tx = db.transaction(['coins', 'precoins'], 'readwrite');
tx.objectStore('precoins').delete(coin.coinPub);
tx.objectStore('coins').add(coin);
return new Promise<void>((resolve, reject) => {
tx.oncomplete = (e) => {
resolve();
updateBadge(db);
}
});
}
function withdraw(db, denom, reserve): Promise<void> {
return withdrawPrepare(db, denom, reserve)
.then((pc) => withdrawExecute(db, pc))
.then((c) => storeCoin(db, c));
}
/**
* Withdraw coins from a reserve until it is empty.
*/
function depleteReserve(db, 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) {
break;
}
}
// Do the request one by one.
function next(): void {
if (workList.length == 0) {
return;
}
console.log("doing work");
let d = workList.pop();
withdraw(db, d, reserve)
.then(() => next());
}
next();
}
function updateReserve(db, reservePub: EddsaPublicKey, mint) {
let reserve;
return new Promise((resolve, reject) => {
let tx = db.transaction(['reserves']);
tx.objectStore('reserves').get(reservePub.toCrock()).onsuccess = (e) => {
let reserve = e.target.result;
let reqUrl = URI("reserve/status").absoluteTo(mint.baseUrl);
reqUrl.query({'reserve_pub': reservePub.toCrock()});
let myRequest = new XMLHttpRequest();
console.log("making request to " + reqUrl.href());
myRequest.open('get', reqUrl.href());
myRequest.send();
myRequest.addEventListener('readystatechange', (e) => {
if (myRequest.readyState == XMLHttpRequest.DONE) {
if (myRequest.status != 200) {
reject();
return;
}
let reserveInfo = JSON.parse(myRequest.responseText);
console.log("got response " + JSON.stringify(reserveInfo));
reserve.current_amount = reserveInfo.balance;
let tx = db.transaction(['reserves'], 'readwrite');
console.log("putting updated reserve " + JSON.stringify(reserve));
tx.objectStore('reserves').put(reserve);
tx.oncomplete = (e) => {
resolve(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.
*/
function updateMintFromUrl(db, baseUrl) {
console.log("base url is " + baseUrl);
let reqUrl = URI("keys").absoluteTo(baseUrl);
let myRequest = new XMLHttpRequest();
myRequest.open('get', reqUrl.href());
myRequest.send();
return new Promise((resolve, reject) => {
myRequest.addEventListener('readystatechange', (e) => {
console.log("state change to " + myRequest.readyState);
if (myRequest.readyState == XMLHttpRequest.DONE) {
if (myRequest.status == 200) {
console.log("got /keys");
let mintKeysJson = JSON.parse(myRequest.responseText);
if (!mintKeysJson) {
console.log("keys invalid");
reject();
} else {
let mint: Db.Mint = {
baseUrl: baseUrl,
keys: mintKeysJson
};
let tx = db.transaction(['mints', 'denoms'], 'readwrite');
tx.objectStore('mints').put(mint);
for (let d of mintKeysJson.denoms) {
// TODO: verify and complete
let di = {
denomPub: d.denom_pub,
value: d.value
};
tx.objectStore('denoms').put(di);
}
tx.oncomplete = (e) => {
resolve(mint);
};
}
} else {
console.log("/keys request failed with status " + myRequest.status);
// XXX: also write last error to DB to show in the UI
reject();
}
}
});
});
}
function dumpDb(db, detail, sendResponse) {
let dump = {
name: db.name,
version: db.version,
stores: {}
};
console.log("stores: " + JSON.stringify(db.objectStoreNames));
let tx = db.transaction(db.objectStoreNames);
tx.addEventListener('complete', (e) => {
sendResponse(dump);
});
for (let i = 0; i < db.objectStoreNames.length; i++) {
let name = db.objectStoreNames[i];
let storeDump = {};
dump.stores[name] = storeDump;
let store = tx.objectStore(name)
.openCursor()
.addEventListener('success', (e) => {
let cursor = e.target.result;
if (cursor) {
storeDump[cursor.key] = cursor.value;
cursor.continue();
}
});
}
return true;
}
// Just for debugging.
function reset(db, detail, sendResponse) {
let tx = db.transaction(db.objectStoreNames, 'readwrite');
for (let i = 0; i < db.objectStoreNames.length; i++) {
tx.objectStore(db.objectStoreNames[i]).clear();
}
indexedDB.deleteDatabase(DB_NAME);
chrome.browserAction.setBadgeText({text: ""});
console.log("reset done");
return false;
}
function balances(db, detail, sendResponse) {
let byCurrency = {};
let tx = db.transaction(['coins', 'denoms']);
let req = tx.objectStore('coins').openCursor();
req.onsuccess = (e) => {
let cursor = req.result;
if (cursor) {
tx.objectStore('denoms').get(cursor.value.denomPub).onsuccess = (e2) => {
let d = e2.target.result;
console.log("got denom", JSON.stringify(d));
let acc = byCurrency[d.value.currency];
if (!acc) {
acc = new Amount(d.value);
console.log("initial:", JSON.stringify(acc.toJson()));
byCurrency[d.value.currency] = acc.toJson();
} else {
let am = new Amount(acc);
am.add(new Amount(d.value));
byCurrency[d.value.currency] = am.toJson();
console.log("then:", JSON.stringify(am.toJson()));
}
};
cursor.continue();
} else {
sendResponse(byCurrency);
console.log("response", JSON.stringify(byCurrency));
}
};
return true;
}
chrome.browserAction.setBadgeText({text: ""});
openTalerDb().then((db) => {
console.log("db loaded");
updateBadge(db);
chrome.runtime.onMessage.addListener(
function(req, sender, onresponse) {
let dispatch = {
"confirm-reserve": confirmReserve,
"confirm-pay": confirmPay,
"dump-db": dumpDb,
"balances": balances,
"execute-payment": doPayment,
"reset": reset
};
if (req.type in dispatch) {
return dispatch[req.type](db, req.detail, onresponse);
}
console.error(format("Request type {1} unknown, req {0}",
JSON.stringify(req),
req.type));
return false;
});
});
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