110 lines
4.0 KiB
TypeScript
110 lines
4.0 KiB
TypeScript
import {BigNumber} from 'bignumber.js';
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import promisify = require('es6-promisify');
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import ethUtil = require('ethereumjs-util');
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import * as _ from 'lodash';
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import Web3 = require('web3');
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import {crypto} from './crypto';
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import {OrderParams} from './types';
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// In order to benefit from type-safety, we re-assign the global web3 instance injected by Truffle
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// with type `any` to a variable of type `Web3`.
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const web3: Web3 = (global as any).web3;
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export class Order {
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public params: OrderParams;
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constructor(params: OrderParams) {
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this.params = params;
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}
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public isValidSignature() {
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const {v, r, s} = this.params;
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if (_.isUndefined(v) || _.isUndefined(r) || _.isUndefined(s)) {
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throw new Error('Cannot call isValidSignature on unsigned order');
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}
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const orderHash = this.getOrderHash();
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const msgHash = ethUtil.hashPersonalMessage(ethUtil.toBuffer(orderHash));
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try {
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const pubKey = ethUtil.ecrecover(msgHash, v, ethUtil.toBuffer(r), ethUtil.toBuffer(s));
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const recoveredAddress = ethUtil.bufferToHex(ethUtil.pubToAddress(pubKey));
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return recoveredAddress === this.params.maker;
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} catch (err) {
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return false;
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}
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}
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public async signAsync() {
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const orderHash = this.getOrderHash();
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const signature = await promisify(web3.eth.sign)(this.params.maker, orderHash);
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const {v, r, s} = ethUtil.fromRpcSig(signature);
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this.params = _.assign(this.params, {
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orderHashHex: orderHash,
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v,
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r: ethUtil.bufferToHex(r),
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s: ethUtil.bufferToHex(s),
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});
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}
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public createFill(shouldThrowOnInsufficientBalanceOrAllowance?: boolean, fillTakerTokenAmount?: BigNumber) {
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const fill = {
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orderAddresses: [
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this.params.maker,
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this.params.taker,
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this.params.makerToken,
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this.params.takerToken,
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this.params.feeRecipient,
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],
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orderValues: [
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this.params.makerTokenAmount,
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this.params.takerTokenAmount,
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this.params.makerFee,
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this.params.takerFee,
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this.params.expirationTimestampInSec,
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this.params.salt,
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],
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fillTakerTokenAmount: fillTakerTokenAmount || this.params.takerTokenAmount,
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shouldThrowOnInsufficientBalanceOrAllowance: !!shouldThrowOnInsufficientBalanceOrAllowance,
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v: this.params.v,
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r: this.params.r,
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s: this.params.s,
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};
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return fill;
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}
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public createCancel(cancelTakerTokenAmount?: BigNumber) {
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const cancel = {
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orderAddresses: [
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this.params.maker,
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this.params.taker,
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this.params.makerToken,
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this.params.takerToken,
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this.params.feeRecipient,
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],
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orderValues: [
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this.params.makerTokenAmount,
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this.params.takerTokenAmount,
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this.params.makerFee,
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this.params.takerFee,
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this.params.expirationTimestampInSec,
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this.params.salt,
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],
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cancelTakerTokenAmount: cancelTakerTokenAmount || this.params.takerTokenAmount,
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};
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return cancel;
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}
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private getOrderHash(): string {
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const orderHash = crypto.solSHA3([
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this.params.exchangeContractAddress,
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this.params.maker,
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this.params.taker,
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this.params.makerToken,
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this.params.takerToken,
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this.params.feeRecipient,
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this.params.makerTokenAmount,
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this.params.takerTokenAmount,
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this.params.makerFee,
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this.params.takerFee,
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this.params.expirationTimestampInSec,
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this.params.salt,
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]);
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const orderHashHex = ethUtil.bufferToHex(orderHash);
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return orderHashHex;
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}
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}
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