@xmr-core/xmr-mymonero-libs
Version:
A collection of utilities for building ontop of a MyMonero compatible API
120 lines • 5.54 kB
JavaScript
;
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
var __generator = (this && this.__generator) || function (thisArg, body) {
var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
function verb(n) { return function (v) { return step([n, v]); }; }
function step(op) {
if (f) throw new TypeError("Generator is already executing.");
while (_) try {
if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
if (y = 0, t) op = [op[0] & 2, t.value];
switch (op[0]) {
case 0: case 1: t = op; break;
case 4: _.label++; return { value: op[1], done: false };
case 5: _.label++; y = op[1]; op = [0]; continue;
case 7: op = _.ops.pop(); _.trys.pop(); continue;
default:
if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
if (t[2]) _.ops.pop();
_.trys.pop(); continue;
}
op = body.call(thisArg, _);
} catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
}
};
Object.defineProperty(exports, "__esModule", { value: true });
var xmr_crypto_utils_1 = require("@xmr-core/xmr-crypto-utils");
var derive_key_image_from_tx = xmr_crypto_utils_1.key_image.derive_key_image_from_tx;
var keyImagesByWalletId = {};
/**
* @description Performs a memoized computation of a key image
* @param {KeyImageCache} keyImageCache
* @param {string} txPubKey
* @param {number} outIndex
* @param {string} address
* @param {string} privViewKey
* @param {string} pubSpendKey
* @param {string} privSpendKey
* @returns
*/
function genKeyImageFromTx(keyImageCache, txPubKey, outIndex, address, privViewKey, pubSpendKey, privSpendKey, hwdev) {
return __awaiter(this, void 0, void 0, function () {
var cacheIndex, cachedKeyImage, key_image;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
cacheIndex = txPubKey + ":" + address + ":" + outIndex;
cachedKeyImage = keyImageCache[cacheIndex];
if (cachedKeyImage) {
return [2 /*return*/, cachedKeyImage];
}
return [4 /*yield*/, derive_key_image_from_tx(txPubKey, privViewKey, pubSpendKey, privSpendKey, outIndex, hwdev)];
case 1:
key_image = (_a.sent()).key_image;
// cache the computed key image
keyImageCache[cacheIndex] = key_image;
return [2 /*return*/, key_image];
}
});
});
}
exports.genKeyImageFromTx = genKeyImageFromTx;
/**
*
* @description Get a key image cache, that's mapped by address
* @export
* @param {string} address
*/
function getKeyImageCache(address) {
var cacheId = parseAddress(address);
var cache = keyImagesByWalletId[cacheId];
if (!cache) {
cache = {};
keyImagesByWalletId[cacheId] = cache;
}
return cache;
}
exports.getKeyImageCache = getKeyImageCache;
/**
* @description Clears a key image cache that's mapped by the users address
*
*
* IMPORTANT: Ensure you call this method when you want to clear your wallet from
* memory or delete it, or else you could leak key images and public addresses.
* @export
* @param {string} address
*/
function clearKeyImageCache(address) {
var cacheId = parseAddress(address);
delete keyImagesByWalletId[cacheId];
var cache = keyImagesByWalletId[cacheId];
if (cache) {
throw Error("Key image cache still exists after deletion");
}
}
exports.clearKeyImageCache = clearKeyImageCache;
/**
* @description Normalize an address before using it to access the key image cache map as a key
* @param {string} address
*/
function parseAddress(address) {
// NOTE: making the assumption that public_address is unique enough to identify a wallet for caching....
// FIXME: with subaddresses, is that still the case? would we need to split them up by subaddr anyway?
if (!address) {
throw Error("Address does not exist");
}
return address.toString();
}
//# sourceMappingURL=memoized-keyimage-generation.js.map