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import {ExchangeContractErrs, SignedOrder} from '../types';
import {TokenWrapper} from '../contract_wrappers/token_wrapper';
export class OrderValidationUtils {
private tokenWrapper: TokenWrapper;
constructor(tokenWrapper: TokenWrapper) {
this.tokenWrapper = tokenWrapper;
}
public async validateFillOrderBalancesAllowancesThrowIfInvalidAsync(
signedOrder: SignedOrder, fillTakerAmount: BigNumber.BigNumber, senderAddress: string, zrxTokenAddress: string,
): Promise<void> {
await this.validateFillOrderMakerBalancesAllowancesThrowIfInvalidAsync(
signedOrder, fillTakerAmount, zrxTokenAddress,
);
await this.validateFillOrderTakerBalancesAllowancesThrowIfInvalidAsync(
signedOrder, fillTakerAmount, senderAddress, zrxTokenAddress,
);
}
private async validateFillOrderMakerBalancesAllowancesThrowIfInvalidAsync(
signedOrder: SignedOrder, fillTakerAmount: BigNumber.BigNumber, zrxTokenAddress: string,
): Promise<void> {
const makerBalance = await this.tokenWrapper.getBalanceAsync(signedOrder.makerTokenAddress, signedOrder.maker);
const makerAllowance = await this.tokenWrapper.getProxyAllowanceAsync(
signedOrder.makerTokenAddress, signedOrder.maker);
const isMakerTokenZRX = signedOrder.makerTokenAddress === zrxTokenAddress;
// exchangeRate is the price of one maker token denominated in taker tokens
const exchangeRate = signedOrder.takerTokenAmount.div(signedOrder.makerTokenAmount);
const fillMakerAmount = fillTakerAmount.div(exchangeRate);
if (isMakerTokenZRX) {
const requiredMakerAmount = fillMakerAmount.plus(signedOrder.makerFee);
if (requiredMakerAmount.greaterThan(makerBalance)) {
throw new Error(ExchangeContractErrs.InsufficientMakerBalance);
}
if (requiredMakerAmount.greaterThan(makerAllowance)) {
throw new Error(ExchangeContractErrs.InsufficientMakerAllowance);
}
} else {
const makerZRXBalance = await this.tokenWrapper.getBalanceAsync(zrxTokenAddress, signedOrder.maker);
const makerZRXAllowance = await this.tokenWrapper.getProxyAllowanceAsync(
zrxTokenAddress, signedOrder.maker);
if (fillMakerAmount.greaterThan(makerBalance)) {
throw new Error(ExchangeContractErrs.InsufficientMakerBalance);
}
if (fillMakerAmount.greaterThan(makerAllowance)) {
throw new Error(ExchangeContractErrs.InsufficientMakerAllowance);
}
if (signedOrder.makerFee.greaterThan(makerZRXBalance)) {
throw new Error(ExchangeContractErrs.InsufficientMakerFeeBalance);
}
if (signedOrder.makerFee.greaterThan(makerZRXAllowance)) {
throw new Error(ExchangeContractErrs.InsufficientMakerFeeAllowance);
}
}
}
private async validateFillOrderTakerBalancesAllowancesThrowIfInvalidAsync(
signedOrder: SignedOrder, fillTakerAmount: BigNumber.BigNumber, senderAddress: string, zrxTokenAddress: string,
): Promise<void> {
const takerBalance = await this.tokenWrapper.getBalanceAsync(signedOrder.takerTokenAddress, senderAddress);
const takerAllowance = await this.tokenWrapper.getProxyAllowanceAsync(
signedOrder.takerTokenAddress, senderAddress);
const isTakerTokenZRX = signedOrder.takerTokenAddress === zrxTokenAddress;
if (isTakerTokenZRX) {
const requiredTakerAmount = fillTakerAmount.plus(signedOrder.takerFee);
if (requiredTakerAmount.greaterThan(takerBalance)) {
throw new Error(ExchangeContractErrs.InsufficientTakerBalance);
}
if (requiredTakerAmount.greaterThan(takerAllowance)) {
throw new Error(ExchangeContractErrs.InsufficientTakerAllowance);
}
} else {
const takerZRXBalance = await this.tokenWrapper.getBalanceAsync(zrxTokenAddress, senderAddress);
const takerZRXAllowance = await this.tokenWrapper.getProxyAllowanceAsync(zrxTokenAddress, senderAddress);
if (fillTakerAmount.greaterThan(takerBalance)) {
throw new Error(ExchangeContractErrs.InsufficientTakerBalance);
}
if (fillTakerAmount.greaterThan(takerAllowance)) {
throw new Error(ExchangeContractErrs.InsufficientTakerAllowance);
}
if (signedOrder.takerFee.greaterThan(takerZRXBalance)) {
throw new Error(ExchangeContractErrs.InsufficientTakerFeeBalance);
}
if (signedOrder.takerFee.greaterThan(takerZRXAllowance)) {
throw new Error(ExchangeContractErrs.InsufficientTakerFeeAllowance);
}
}
}
}
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