bank-client-js/lib/index.js

"use strict";
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 __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
const crypto = require("libp2p-crypto");
const util = require("util");
const storage_1 = require("./storage");
const TextEncoder = util.TextEncoder;
const util_1 = require("./util");
const webclient_node_1 = __importDefault(require("./webclient-node"));
class BankClient {
    constructor(urlBase, storage = new storage_1.Storage('bankClient'), webClient = new webclient_node_1.default()) {
        this.urlBase = urlBase;
        this.storage = storage;
        this.webClient = webClient;
    }
    getPub() {
        return new Promise((resolve, reject) => __awaiter(this, void 0, void 0, function* () {
            yield this.bootstrap();
            this.getPriv().id((idErr, pubHash) => {
                if (idErr) {
                    return reject(idErr);
                }
                resolve(pubHash);
            });
        }));
    }
    bootstrap() {
        if (this.bootstrapResult) {
            return Promise.resolve(this.bootstrapResult);
        }
        if (this.bootstrapPromise) {
            return this.bootstrapPromise;
        }
        return this.bootstrapPromise = new Promise((resolve, reject) => {
            this.storage.get('notaprivatekey').then(privateKeyFromStorage => {
                if (privateKeyFromStorage == null) {
                    console.log('no private key in storage. generating new');
                    crypto.keys.generateKeyPair('RSA', 2048, (generateErr, privateKey) => {
                        if (generateErr) {
                            return reject(generateErr);
                        }
                        privateKey.export('password', (exportErr, exportResult) => {
                            if (exportErr) {
                                return reject(exportErr);
                            }
                            this.storage.set('notaprivatekey', exportResult).then(err => {
                                // whatever
                            }).catch(reject);
                            this.privateKey = privateKey;
                            resolve(true);
                        });
                    });
                }
                else {
                    // console.log('importing privatekey');
                    crypto.keys.import(privateKeyFromStorage, 'password', (err, importedPrivateKey) => {
                        if (err) {
                            return reject(err);
                        }
                        this.privateKey = importedPrivateKey;
                        // console.log(this.getPublicKeyString());
                        // console.log(privateKeyFromStorage);
                        resolve(true);
                    });
                }
            }).catch(reject);
        });
    }
    getNonce() {
        return __awaiter(this, void 0, void 0, function* () {
            const nonce = yield this.webClient.request({
                method: 'GET',
                url: this.urlBase + '/bank/nonce'
            });
            return Number(nonce);
        });
    }
    getBalance() {
        return __awaiter(this, void 0, void 0, function* () {
            const nonce = yield this.getNonce();
            const retrieveRequest = yield this.makePlaintextPayload(JSON.stringify({
                _date: new Date().toISOString(),
                _nonce: nonce
            }));
            const topicURL = this.urlBase + '/bank/getbalance';
            const postResponse = yield this.webClient.requestJSON({
                body: retrieveRequest,
                method: 'POST',
                url: topicURL
            });
            return postResponse.balance;
        });
    }
    getPriv() {
        if (!this.privateKey) {
            throw new Error('missing private key');
        }
        return this.privateKey;
    }
    makePlaintextPayload(message) {
        const messageBytes = new TextEncoder().encode(message);
        return new Promise((resolve, reject) => __awaiter(this, void 0, void 0, function* () {
            yield this.bootstrap();
            this.privateKey.sign(messageBytes, (signErr, signatureBytes) => __awaiter(this, void 0, void 0, function* () {
                if (signErr) {
                    reject(signErr);
                    return;
                }
                const publicDERBytes = this.privateKey.public.bytes;
                this.privateKey.id((idErr, pubHash) => {
                    if (idErr) {
                        reject(idErr);
                        return;
                    }
                    const result = {
                        date: new Date().toISOString(),
                        msg: util_1.encodeHex(messageBytes),
                        pub: util_1.encodeHex(publicDERBytes),
                        pubHash,
                        sig: util_1.encodeHex(signatureBytes),
                    };
                    // console.log('result', result, signatureBytes);
                    resolve(result);
                });
            }));
        }));
    }
}
exports.BankClient = BankClient;
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