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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 { SignedOrderParams } from './types';
export class SignedOrder {
public params: SignedOrderParams;
private _web3Wrapper: Web3Wrapper;
constructor(web3Wrapper: Web3Wrapper, params: SignedOrderParams) {
this.params = params;
this._web3Wrapper = web3Wrapper;
}
public isValidSignature() {
const { v, r, s } = this.params;
const orderHash = this.getOrderHashHex();
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 createFill(shouldThrowOnInsufficientBalanceOrAllowance?: boolean, fillTakerTokenAmount?: 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,
],
fillTakerTokenAmount: fillTakerTokenAmount || this.params.takerTokenAmount,
shouldThrowOnInsufficientBalanceOrAllowance: !!shouldThrowOnInsufficientBalanceOrAllowance,
v: this.params.v,
r: this.params.r,
s: this.params.s,
};
return fill;
}
public createCancel(cancelTakerTokenAmount?: 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,
],
cancelTakerTokenAmount: cancelTakerTokenAmount || this.params.takerTokenAmount,
};
return cancel;
}
public getOrderHashHex(): 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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