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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 { OrderStruct, SignatureType, SignedOrder } from './types';
export const signedOrderUtils = {
createFill: (signedOrder: SignedOrder, takerTokenFillAmount?: BigNumber) => {
const fill = {
order: signedOrderUtils.getOrderStruct(signedOrder),
takerTokenFillAmount: takerTokenFillAmount || signedOrder.takerTokenAmount,
signature: signedOrder.signature,
};
return fill;
},
createCancel(signedOrder: SignedOrder, takerTokenCancelAmount?: BigNumber) {
const cancel = {
order: signedOrderUtils.getOrderStruct(signedOrder),
takerTokenCancelAmount: takerTokenCancelAmount || signedOrder.takerTokenAmount,
};
return cancel;
},
getOrderStruct(signedOrder: SignedOrder): OrderStruct {
const orderStruct = {
makerAddress: signedOrder.makerAddress,
takerAddress: signedOrder.takerAddress,
makerTokenAddress: signedOrder.makerTokenAddress,
takerTokenAddress: signedOrder.takerTokenAddress,
feeRecipientAddress: signedOrder.feeRecipientAddress,
makerTokenAmount: signedOrder.makerTokenAmount,
takerTokenAmount: signedOrder.takerTokenAmount,
makerFeeAmount: signedOrder.makerFeeAmount,
takerFeeAmount: signedOrder.takerFeeAmount,
expirationTimeSeconds: signedOrder.expirationTimeSeconds,
salt: signedOrder.salt,
};
return orderStruct;
},
getOrderHashHex(signedOrder: SignedOrder): string {
const orderSchemaHashBuff = crypto.solSHA3([
'address exchangeAddress',
'address makerAddress',
'address takerAddress',
'address makerTokenAddress',
'address takerTokenAddress',
'address feeRecipientAddress',
'uint256 makerTokenAmount',
'uint256 takerTokenAmount',
'uint256 makerFeeAmount',
'uint256 takerFeeAmount',
'uint256 expirationTimestampSeconds',
'uint256 salt',
]);
const orderSchemaHashHex = `0x${orderSchemaHashBuff.toString('hex')}`;
const orderHashBuff = crypto.solSHA3([
signedOrder.exchangeAddress,
signedOrder.makerAddress,
signedOrder.takerAddress,
signedOrder.makerTokenAddress,
signedOrder.takerTokenAddress,
signedOrder.feeRecipientAddress,
signedOrder.makerTokenAmount,
signedOrder.takerTokenAmount,
signedOrder.makerFeeAmount,
signedOrder.takerFeeAmount,
signedOrder.expirationTimeSeconds,
signedOrder.salt,
]);
const orderHashHex = `0x${orderHashBuff.toString('hex')}`;
const prefixedOrderHashBuff = crypto.solSHA3([new BigNumber(orderSchemaHashHex), new BigNumber(orderHashHex)]);
const prefixedOrderHashHex = `0x${prefixedOrderHashBuff.toString('hex')}`;
return prefixedOrderHashHex;
},
getSignatureType(signature: string): SignatureType {
const signatureBuff = new Buffer(signature);
const signatureType = signatureBuff[0];
if (!_.has(SignatureType, signatureType)) {
throw new Error(`${signatureType} is not a valid signature type`);
}
return signatureType;
},
};
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