610 lines
23 KiB
JavaScript
610 lines
23 KiB
JavaScript
/// <reference path="../decl/urijs/URIjs.d.ts" />
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/// <reference path="../decl/chrome/chrome.d.ts" />
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'use strict';
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/**
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* See http://api.taler.net/wallet.html#general
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*/
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function canonicalizeBaseUrl(url) {
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let x = new URI(url);
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if (!x.protocol()) {
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x.protocol("https");
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}
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x.path(x.path() + "/").normalizePath();
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x.fragment();
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x.query();
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return x.href();
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}
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function signDeposit(db, offer, cds) {
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let ret = [];
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let amountSpent = Amount.getZero(cds[0].coin.currentAmount.currency);
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let amountRemaining = new Amount(offer.contract.amount);
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cds = copy(cds);
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for (let cd of cds) {
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let coinSpend;
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console.log("amount remaining:", amountRemaining.toJson());
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if (amountRemaining.value == 0 && amountRemaining.fraction == 0) {
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console.log("full amount spent");
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break;
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}
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if (amountRemaining.cmp(new Amount(cd.coin.currentAmount)) < 0) {
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coinSpend = new Amount(amountRemaining.toJson());
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}
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else {
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coinSpend = new Amount(cd.coin.currentAmount);
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}
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amountSpent.add(coinSpend);
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amountRemaining.sub(coinSpend);
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let d = new DepositRequestPS({
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h_contract: HashCode.fromCrock(offer.H_contract),
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h_wire: HashCode.fromCrock(offer.contract.H_wire),
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amount_with_fee: new Amount(cd.coin.currentAmount).toNbo(),
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coin_pub: EddsaPublicKey.fromCrock(cd.coin.coinPub),
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deposit_fee: new Amount(cd.denom.fee_deposit).toNbo(),
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merchant: EddsaPublicKey.fromCrock(offer.contract.merchant_pub),
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refund_deadline: AbsoluteTimeNbo.fromTalerString(offer.contract.refund_deadline),
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timestamp: AbsoluteTimeNbo.fromTalerString(offer.contract.timestamp),
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transaction_id: UInt64.fromNumber(offer.contract.transaction_id),
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});
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let newAmount = new Amount(cd.coin.currentAmount);
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newAmount.sub(coinSpend);
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cd.coin.currentAmount = newAmount.toJson();
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let coinSig = eddsaSign(d.toPurpose(), EddsaPrivateKey.fromCrock(cd.coin.coinPriv))
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.toCrock();
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let s = {
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coin_sig: coinSig,
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coin_pub: cd.coin.coinPub,
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ub_sig: cd.coin.denomSig,
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denom_pub: cd.coin.denomPub,
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f: amountSpent.toJson(),
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};
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ret.push({ sig: s, updatedCoin: cd.coin });
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}
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return ret;
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}
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/**
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* Get mints and associated coins that are still spendable,
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* but only if the sum the coins' remaining value exceeds the payment amount.
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* @param db
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* @param paymentAmount
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* @param depositFeeLimit
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* @param allowedMints
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*/
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function getPossibleMintCoins(db, paymentAmount, depositFeeLimit, allowedMints) {
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return new Promise((resolve, reject) => {
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let m = {};
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let found = false;
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let tx = db.transaction(["mints", "coins"]);
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// First pass: Get all coins from acceptable mints.
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for (let info of allowedMints) {
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let req_mints = tx.objectStore("mints")
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.index("pubKey")
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.get(info.master_pub);
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req_mints.onsuccess = (e) => {
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let mint = req_mints.result;
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if (!mint) {
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throw Error("no matching mint in index");
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}
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let req_coins = tx.objectStore("coins")
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.index("mintBaseUrl")
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.openCursor(IDBKeyRange.only(mint.baseUrl));
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req_coins.onsuccess = (e) => {
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let cursor = req_coins.result;
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if (!cursor) {
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return;
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}
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let value = cursor.value;
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let cd = {
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coin: cursor.value,
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denom: mint.keys.denoms.find((e) => e.denom_pub === value.denomPub)
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};
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if (!cd.denom) {
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throw Error("denom not found");
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}
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let x = m[mint.baseUrl];
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if (!x) {
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m[mint.baseUrl] = [cd];
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}
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else {
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x.push(cd);
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}
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cursor.continue();
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};
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};
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}
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tx.oncomplete = (e) => {
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let ret = {};
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nextMint: for (let key in m) {
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let coins = m[key].map((x) => ({
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a: new Amount(x.denom.fee_deposit),
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c: x
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}));
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// Sort by ascending deposit fee
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coins.sort((o1, o2) => o1.a.cmp(o2.a));
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let maxFee = new Amount(depositFeeLimit);
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let minAmount = new Amount(paymentAmount);
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let accFee = new Amount(coins[0].c.denom.fee_deposit);
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let accAmount = new Amount(coins[0].c.coin.currentAmount);
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for (let i = 0; i < coins.length; i++) {
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if (accFee.cmp(maxFee) >= 0) {
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continue nextMint;
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}
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if (accAmount.cmp(minAmount) >= 0) {
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ret[key] = m[key];
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continue nextMint;
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}
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accFee.add(coins[i].a);
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accFee.add(new Amount(coins[i].c.coin.currentAmount));
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}
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}
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resolve(ret);
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};
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tx.onerror = (e) => {
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reject();
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};
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});
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}
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function executePay(db, offer, payCoinInfo, merchantBaseUrl, chosenMint) {
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return new Promise((resolve, reject) => {
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let reqData = {};
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reqData["H_wire"] = offer.contract.H_wire;
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reqData["H_contract"] = offer.H_contract;
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reqData["transaction_id"] = offer.contract.transaction_id;
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reqData["refund_deadline"] = offer.contract.refund_deadline;
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reqData["mint"] = URI(chosenMint).hostname();
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reqData["coins"] = payCoinInfo.map((x) => x.sig);
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reqData["timestamp"] = offer.contract.timestamp;
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let payUrl = URI(offer.contract.pay_url).absoluteTo(merchantBaseUrl);
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console.log("Merchant URL", payUrl.href());
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let req = new XMLHttpRequest();
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req.open('post', payUrl.href());
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req.setRequestHeader("Content-Type", "application/json;charset=UTF-8");
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req.send(JSON.stringify(reqData));
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req.addEventListener('readystatechange', (e) => {
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if (req.readyState == XMLHttpRequest.DONE) {
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if (req.status == 200) {
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console.log("Merchant response:", req.responseText);
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resolve();
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}
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else {
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throw Error("bad status " + req.status);
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}
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}
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});
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});
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}
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function confirmPay(db, detail, sendResponse) {
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console.log("confirmPay", JSON.stringify(detail));
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let tx = db.transaction(['transactions'], 'readwrite');
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let trans = {
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contractHash: detail.offer.H_contract,
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contract: detail.offer.contract,
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sig: detail.offer
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};
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let offer = detail.offer;
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getPossibleMintCoins(db, offer.contract.amount, offer.contract.max_fee, offer.contract.mints)
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.then((mcs) => {
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if (Object.keys(mcs).length == 0) {
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sendResponse({ error: "Not enough coins." });
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return;
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}
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let mintUrl = Object.keys(mcs)[0];
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let ds = signDeposit(db, offer, mcs[mintUrl]);
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return executePay(db, offer, ds, detail.merchantPageUrl, mintUrl);
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})
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.then(() => {
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sendResponse({ success: true });
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});
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return true;
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}
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function confirmReserve(db, detail, sendResponse) {
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let reservePriv = EddsaPrivateKey.create();
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let reservePub = reservePriv.getPublicKey();
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let form = new FormData();
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let now = (new Date()).toString();
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form.append(detail.field_amount, detail.amount_str);
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form.append(detail.field_reserve_pub, reservePub.toCrock());
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form.append(detail.field_mint, detail.mint);
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// XXX: set bank-specified fields.
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let myRequest = new XMLHttpRequest();
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console.log("making request to " + detail.post_url);
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myRequest.open('post', detail.post_url);
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myRequest.send(form);
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let mintBaseUrl = canonicalizeBaseUrl(detail.mint);
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myRequest.addEventListener('readystatechange', (e) => {
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if (myRequest.readyState == XMLHttpRequest.DONE) {
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// TODO: extract as interface
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let resp = {
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status: myRequest.status,
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text: myRequest.responseText,
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success: undefined,
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backlink: undefined
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};
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let reserveRecord = {
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reserve_pub: reservePub.toCrock(),
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reserve_priv: reservePriv.toCrock(),
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mint_base_url: mintBaseUrl,
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created: now,
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last_query: null,
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current_amount: null,
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// XXX: set to actual amount
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initial_amount: null
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};
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// XXX: insert into db.
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switch (myRequest.status) {
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case 200:
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resp.success = true;
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// We can't show the page directly, so
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// we show some generic page from the wallet.
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resp.backlink = chrome.extension.getURL("pages/reserve-success.html");
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let tx = db.transaction(['reserves'], 'readwrite');
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tx.objectStore('reserves').add(reserveRecord);
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tx.addEventListener('complete', (e) => {
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console.log('tx complete, pk was ' + reserveRecord.reserve_pub);
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sendResponse(resp);
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var mint;
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updateMintFromUrl(db, reserveRecord.mint_base_url)
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.then((m) => {
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mint = m;
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return updateReserve(db, reservePub, mint);
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})
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.then((reserve) => depleteReserve(db, reserve, mint));
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});
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break;
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default:
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resp.success = false;
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sendResponse(resp);
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}
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}
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});
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// Allow async response
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return true;
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}
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function copy(o) {
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return JSON.parse(JSON.stringify(o));
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}
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function rankDenom(denom1, denom2) {
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// Slow ... we should find a better way than to convert it evert time.
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let v1 = new Amount(denom1.value);
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let v2 = new Amount(denom2.value);
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return (-1) * v1.cmp(v2);
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}
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function withdrawPrepare(db, denom, reserve) {
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let reservePriv = new EddsaPrivateKey();
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reservePriv.loadCrock(reserve.reserve_priv);
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let reservePub = new EddsaPublicKey();
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reservePub.loadCrock(reserve.reserve_pub);
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let denomPub = RsaPublicKey.fromCrock(denom.denom_pub);
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let coinPriv = EddsaPrivateKey.create();
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let coinPub = coinPriv.getPublicKey();
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let blindingFactor = RsaBlindingKey.create(1024);
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let pubHash = coinPub.hash();
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let ev = rsaBlind(pubHash, blindingFactor, denomPub);
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if (!denom.fee_withdraw) {
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throw Error("Field fee_withdraw missing");
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}
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let amountWithFee = new Amount(denom.value);
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amountWithFee.add(new Amount(denom.fee_withdraw));
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let withdrawFee = new Amount(denom.fee_withdraw);
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// Signature
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let withdrawRequest = new WithdrawRequestPS({
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reserve_pub: reservePub,
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amount_with_fee: amountWithFee.toNbo(),
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withdraw_fee: withdrawFee.toNbo(),
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h_denomination_pub: denomPub.encode().hash(),
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h_coin_envelope: ev.hash()
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});
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console.log("about to sign");
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var sig = eddsaSign(withdrawRequest.toPurpose(), reservePriv);
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console.log("signed");
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console.log("crypto done, doing request");
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let preCoin = {
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reservePub: reservePub.toCrock(),
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blindingKey: blindingFactor.toCrock(),
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coinPub: coinPub.toCrock(),
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coinPriv: coinPriv.toCrock(),
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denomPub: denomPub.encode().toCrock(),
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mintBaseUrl: reserve.mint_base_url,
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withdrawSig: sig.toCrock(),
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coinEv: ev.toCrock(),
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coinValue: denom.value
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};
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console.log("storing precoin", JSON.stringify(preCoin));
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let tx = db.transaction(['precoins'], 'readwrite');
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tx.objectStore('precoins').add(preCoin);
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return new Promise((resolve, reject) => {
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tx.oncomplete = (e) => {
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resolve(preCoin);
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};
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});
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}
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function dbGet(db, store, key) {
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let tx = db.transaction([store]);
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let req = tx.objectStore(store).get(key);
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return new Promise((resolve, reject) => {
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req.onsuccess = (e) => resolve(req.result);
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});
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}
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function withdrawExecute(db, pc) {
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return dbGet(db, 'reserves', pc.reservePub)
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.then((r) => new Promise((resolve, reject) => {
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console.log("loading precoin", JSON.stringify(pc));
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let wd = {};
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wd.denom_pub = pc.denomPub;
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wd.reserve_pub = pc.reservePub;
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wd.reserve_sig = pc.withdrawSig;
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wd.coin_ev = pc.coinEv;
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let reqUrl = URI("reserve/withdraw").absoluteTo(r.mint_base_url);
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let myRequest = new XMLHttpRequest();
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console.log("making request to " + reqUrl.href());
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myRequest.open('post', reqUrl.href());
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myRequest.setRequestHeader("Content-Type", "application/json;charset=UTF-8");
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myRequest.send(JSON.stringify(wd));
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myRequest.addEventListener('readystatechange', (e) => {
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if (myRequest.readyState == XMLHttpRequest.DONE) {
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if (myRequest.status != 200) {
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console.log("Withdrawal failed, status ", myRequest.status);
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reject();
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return;
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}
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console.log("Withdrawal successful");
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console.log(myRequest.responseText);
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let resp = JSON.parse(myRequest.responseText);
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let denomSig = rsaUnblind(RsaSignature.fromCrock(resp.ev_sig), RsaBlindingKey.fromCrock(pc.blindingKey), RsaPublicKey.fromCrock(pc.denomPub));
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let coin = {
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coinPub: pc.coinPub,
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coinPriv: pc.coinPriv,
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denomPub: pc.denomPub,
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denomSig: denomSig.encode().toCrock(),
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currentAmount: pc.coinValue,
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mintBaseUrl: pc.mintBaseUrl,
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};
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console.log("unblinded coin");
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resolve(coin);
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}
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else {
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console.log("ready state change to", myRequest.status);
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}
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});
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}));
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}
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function updateBadge(db) {
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let tx = db.transaction(['coins'], 'readwrite');
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let req = tx.objectStore('coins').openCursor();
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let n = 0;
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req.onsuccess = (e) => {
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let cursor = req.result;
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if (cursor) {
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n++;
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cursor.continue();
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}
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else {
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console.log("badge");
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chrome.browserAction.setBadgeText({ text: "" + n });
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chrome.browserAction.setBadgeBackgroundColor({ color: "#0F0" });
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}
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};
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}
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function storeCoin(db, coin) {
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let tx = db.transaction(['coins', 'precoins'], 'readwrite');
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tx.objectStore('precoins').delete(coin.coinPub);
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tx.objectStore('coins').add(coin);
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return new Promise((resolve, reject) => {
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tx.oncomplete = (e) => {
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resolve();
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updateBadge(db);
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};
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});
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}
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function withdraw(db, denom, reserve) {
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return withdrawPrepare(db, denom, reserve)
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.then((pc) => withdrawExecute(db, pc))
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.then((c) => storeCoin(db, c));
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}
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/**
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* Withdraw coins from a reserve until it is empty.
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*/
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function depleteReserve(db, reserve, mint) {
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let denoms = copy(mint.keys.denoms);
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let remaining = new Amount(reserve.current_amount);
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denoms.sort(rankDenom);
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let workList = [];
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for (let i = 0; i < 1000; i++) {
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let found = false;
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for (let d of denoms) {
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let cost = new Amount(d.value);
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cost.add(new Amount(d.fee_withdraw));
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if (remaining.cmp(cost) < 0) {
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continue;
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}
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found = true;
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remaining.sub(cost);
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workList.push(d);
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}
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if (!found) {
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break;
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}
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}
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// Do the request one by one.
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function next() {
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if (workList.length == 0) {
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return;
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}
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console.log("doing work");
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let d = workList.pop();
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withdraw(db, d, reserve)
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.then(() => next());
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}
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next();
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}
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function updateReserve(db, reservePub, mint) {
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let reserve;
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return new Promise((resolve, reject) => {
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let tx = db.transaction(['reserves']);
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tx.objectStore('reserves').get(reservePub.toCrock()).onsuccess = (e) => {
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let reserve = e.target.result;
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let reqUrl = URI("reserve/status").absoluteTo(mint.baseUrl);
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reqUrl.query({ 'reserve_pub': reservePub.toCrock() });
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let myRequest = new XMLHttpRequest();
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console.log("making request to " + reqUrl.href());
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myRequest.open('get', reqUrl.href());
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myRequest.send();
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myRequest.addEventListener('readystatechange', (e) => {
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if (myRequest.readyState == XMLHttpRequest.DONE) {
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if (myRequest.status != 200) {
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reject();
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return;
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}
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let reserveInfo = JSON.parse(myRequest.responseText);
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console.log("got response " + JSON.stringify(reserveInfo));
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reserve.current_amount = reserveInfo.balance;
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let tx = db.transaction(['reserves'], 'readwrite');
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console.log("putting updated reserve " + JSON.stringify(reserve));
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tx.objectStore('reserves').put(reserve);
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tx.oncomplete = (e) => {
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resolve(reserve);
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};
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}
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});
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};
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});
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}
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/**
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* Update or add mint DB entry by fetching the /keys information.
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* Optionally link the reserve entry to the new or existing
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* mint entry in then DB.
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*/
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function updateMintFromUrl(db, baseUrl) {
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console.log("base url is " + baseUrl);
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let reqUrl = URI("keys").absoluteTo(baseUrl);
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|
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 = {
|
|
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");
|
|
chrome.runtime.onMessage.addListener(function (req, sender, onresponse) {
|
|
let dispatch = {
|
|
"confirm-reserve": confirmReserve,
|
|
"confirm-pay": confirmPay,
|
|
"dump-db": dumpDb,
|
|
"balances": balances,
|
|
"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;
|
|
});
|
|
});
|