jcc-ethereum-utils/lib/erc20.js

Toolkit of crossing chain from Ethereum to SWTC chain

"use strict";
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};
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
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        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
Object.defineProperty(exports, "__esModule", { value: true });
const bignumber_js_1 = require("bignumber.js");
const erc20ABI_1 = require("./abi/erc20ABI");
const ethereum_1 = require("./ethereum");
const smartContract_1 = require("./smartContract");
const validator_1 = require("./validator");
/**
 * toolkit of erc20
 *
 * @class ERC20
 */
class ERC20 extends smartContract_1.default {
    /**
     * Creates an instance of ERC20
     * @memberof ERC20
     */
    constructor() {
        super();
    }
    /**
     * init instance of erc20 contract
     *
     * @param {string} contractAddress contract address of erc20 token
     * @memberof ERC20
     */
    init(contractAddress, ethereum) {
        super.init(contractAddress, ethereum, erc20ABI_1.default);
    }
    /**
     * destroy instance of erc20 contract
     *
     * @memberof ERC20
     */
    destroy() {
        super.destroy();
    }
    /**
     * request decimals of erc20 token
     *
     * @returns {Promise<number>}
     * @memberof ERC20
     */
    decimals() {
        const _super = Object.create(null, {
            callABI: { get: () => super.callABI }
        });
        return __awaiter(this, void 0, void 0, function* () {
            const decimals = (yield _super.callABI.call(this, "decimals"));
            return parseInt(decimals, 10);
        });
    }
    /**
     * request balance of erc20 token
     *
     * @param {string} address ethereum address
     * @returns {Promise<string>} resolve "0" if request failed
     * @memberof ERC20
     */
    balanceOf(address) {
        const _super = Object.create(null, {
            callABI: { get: () => super.callABI }
        });
        return __awaiter(this, void 0, void 0, function* () {
            const bnBalance = (yield _super.callABI.call(this, "balanceOf", address));
            const decimals = yield this.decimals();
            const balance = new bignumber_js_1.default(bnBalance).dividedBy(Math.pow(10, decimals)).toString(10);
            return balance;
        });
    }
    /**
     * transfer token to erc20 contract address
     *
     * @param {string} secret ethereum secret of sender address
     * @param {string} to address of destination
     * @param {string} amount amount
     * @param {string} [nonce] nonce
     * @returns {Promise<string>} resolve hash if success
     * @memberof ERC20
     */
    transfer(secret, to, amount, nonce) {
        const _super = Object.create(null, {
            callABI: { get: () => super.callABI }
        });
        return __awaiter(this, void 0, void 0, function* () {
            const decimals = yield this.decimals();
            const sender = ethereum_1.default.getAddress(secret);
            const web3 = this.ethereum.getWeb3();
            const value = web3.utils.numberToHex(new bignumber_js_1.default(amount).multipliedBy(Math.pow(10, decimals)).toString(10));
            const gasPrice = yield this.ethereum.getGasPrice();
            const resolvedNonce = nonce !== undefined && new bignumber_js_1.default(nonce).isInteger() ? nonce : yield this.ethereum.getNonce(sender);
            const calldata = (yield _super.callABI.call(this, "transfer", to, value));
            const tx = this.ethereum.getTx(sender, this.contractAddress, resolvedNonce, 90000, gasPrice, "0", calldata);
            const sign = yield this.ethereum.signTransaction(tx, secret);
            const hash = yield this.ethereum.sendSignedTransaction(sign);
            return hash;
        });
    }
}
__decorate([
    validator_1.validate,
    __param(0, validator_1.isValidEthereumAddress)
], ERC20.prototype, "init", null);
__decorate([
    validator_1.validate,
    __param(0, validator_1.isValidEthereumSecret),
    __param(1, validator_1.isValidEthereumAddress),
    __param(2, validator_1.isValidAmount)
], ERC20.prototype, "transfer", null);
exports.default = ERC20;
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