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import { promisify } from '@0xproject/utils';
import { BigNumber } from '@0xproject/utils';
import ethUtil = require('ethereumjs-util');
import * as _ from 'lodash';
import Web3 = require('web3');
import { crypto } from './crypto';
import { OrderParams } from './types';
// In order to benefit from type-safety, we re-assign the global web3 instance injected by Truffle
// with type `any` to a variable of type `Web3`.
const web3: Web3 = (global as any).web3;
export class Order {
public params: OrderParams;
constructor(params: OrderParams) {
this.params = params;
}
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 promisify<string>(web3.eth.sign)(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(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;
}
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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