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import { BigNumber } from '@0xproject/utils';
import { Web3Wrapper } from '@0xproject/web3-wrapper';
import ethUtil = require('ethereumjs-util');
import * as _ from 'lodash';
import { crypto } from './crypto';
import { OrderParams } from './types';
export class Order {
public params: OrderParams;
private _web3Wrapper: Web3Wrapper;
constructor(web3Wrapper: Web3Wrapper, params: OrderParams) {
this.params = params;
this._web3Wrapper = web3Wrapper;
}
public isValidSignature() {
const { v, r, s } = this.params;
if (_.isUndefined(v) || _.isUndefined(r) || _.isUndefined(s)) {
throw new Error('Cannot call isValidSignature on unsigned order');
}
const orderHash = this._getOrderHash();
const msgHash = ethUtil.hashPersonalMessage(ethUtil.toBuffer(orderHash));
try {
const pubKey = ethUtil.ecrecover(msgHash, v, ethUtil.toBuffer(r), ethUtil.toBuffer(s));
const recoveredAddress = ethUtil.bufferToHex(ethUtil.pubToAddress(pubKey));
return recoveredAddress === this.params.maker;
} catch (err) {
return false;
}
}
public async signAsync() {
const orderHash = this._getOrderHash();
const signature = await this._web3Wrapper.signTransactionAsync(this.params.maker, orderHash);
const { v, r, s } = ethUtil.fromRpcSig(signature);
this.params = _.assign(this.params, {
orderHashHex: orderHash,
v,
r: ethUtil.bufferToHex(r),
s: ethUtil.bufferToHex(s),
});
}
public createFill(takerTokenFillAmount?: BigNumber) {
const fill = {
orderAddresses: [
this.params.maker,
this.params.taker,
this.params.makerToken,
this.params.takerToken,
this.params.feeRecipient,
],
orderValues: [
this.params.makerTokenAmount,
this.params.takerTokenAmount,
this.params.makerFee,
this.params.takerFee,
this.params.expirationTimestampInSec,
this.params.salt,
],
takerTokenFillAmount: takerTokenFillAmount || this.params.takerTokenAmount,
v: this.params.v,
r: this.params.r,
s: this.params.s,
};
return fill;
}
public createCancel(takerTokenCancelAmount?: BigNumber) {
const cancel = {
orderAddresses: [
this.params.maker,
this.params.taker,
this.params.makerToken,
this.params.takerToken,
this.params.feeRecipient,
],
orderValues: [
this.params.makerTokenAmount,
this.params.takerTokenAmount,
this.params.makerFee,
this.params.takerFee,
this.params.expirationTimestampInSec,
this.params.salt,
],
takerTokenCancelAmount: takerTokenCancelAmount || this.params.takerTokenAmount,
};
return cancel;
}
private _getOrderHash(): string {
const orderHash = crypto.solSHA3([
this.params.exchangeContractAddress,
this.params.maker,
this.params.taker,
this.params.makerToken,
this.params.takerToken,
this.params.feeRecipient,
this.params.makerTokenAmount,
this.params.takerTokenAmount,
this.params.makerFee,
this.params.takerFee,
this.params.expirationTimestampInSec,
this.params.salt,
]);
const orderHashHex = ethUtil.bufferToHex(orderHash);
return orderHashHex;
}
}
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