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import { schemas, SchemaValidator } from '@0xproject/json-schemas';
import { Order, SignedOrder } from '@0xproject/types';
import * as _ from 'lodash';
import { assert } from './assert';
import { EIP712Utils } from './eip712_utils';
import { EIP712Schema, EIP712Types } from './types';
const INVALID_TAKER_FORMAT = 'instance.takerAddress is not of a type(s) string';
const EIP712_ORDER_SCHEMA: EIP712Schema = {
name: 'Order',
parameters: [
{ name: 'makerAddress', type: EIP712Types.Address },
{ name: 'takerAddress', type: EIP712Types.Address },
{ name: 'feeRecipientAddress', type: EIP712Types.Address },
{ name: 'senderAddress', type: EIP712Types.Address },
{ name: 'makerAssetAmount', type: EIP712Types.Uint256 },
{ name: 'takerAssetAmount', type: EIP712Types.Uint256 },
{ name: 'makerFee', type: EIP712Types.Uint256 },
{ name: 'takerFee', type: EIP712Types.Uint256 },
{ name: 'expirationTimeSeconds', type: EIP712Types.Uint256 },
{ name: 'salt', type: EIP712Types.Uint256 },
{ name: 'makerAssetData', type: EIP712Types.Bytes },
{ name: 'takerAssetData', type: EIP712Types.Bytes },
],
};
export const orderHashUtils = {
/**
* Checks if the supplied hex encoded order hash is valid.
* Note: Valid means it has the expected format, not that an order with the orderHash exists.
* Use this method when processing orderHashes submitted as user input.
* @param orderHash Hex encoded orderHash.
* @return Whether the supplied orderHash has the expected format.
*/
isValidOrderHash(orderHash: string): boolean {
// Since this method can be called to check if any arbitrary string conforms to an orderHash's
// format, we only assert that we were indeed passed a string.
assert.isString('orderHash', orderHash);
const schemaValidator = new SchemaValidator();
const isValid = schemaValidator.validate(orderHash, schemas.orderHashSchema).valid;
return isValid;
},
/**
* Computes the orderHash for a supplied order.
* @param order An object that conforms to the Order or SignedOrder interface definitions.
* @return The resulting orderHash from hashing the supplied order.
*/
getOrderHashHex(order: SignedOrder | Order): string {
try {
assert.doesConformToSchema('order', order, schemas.orderSchema, [schemas.hexSchema]);
} catch (error) {
if (_.includes(error.message, INVALID_TAKER_FORMAT)) {
const errMsg =
'Order taker must be of type string. If you want anyone to be able to fill an order - pass ZeroEx.NULL_ADDRESS';
throw new Error(errMsg);
}
throw error;
}
const orderHashBuff = orderHashUtils.getOrderHashBuffer(order);
const orderHashHex = `0x${orderHashBuff.toString('hex')}`;
return orderHashHex;
},
/**
* Computes the orderHash for a supplied order and returns it as a Buffer
* @param order An object that conforms to the Order or SignedOrder interface definitions.
* @return The resulting orderHash from hashing the supplied order as a Buffer
*/
getOrderHashBuffer(order: SignedOrder | Order): Buffer {
const orderParamsHashBuff = EIP712Utils.structHash(EIP712_ORDER_SCHEMA, order);
const orderHashBuff = EIP712Utils.createEIP712Message(orderParamsHashBuff, order.exchangeAddress);
return orderHashBuff;
},
_getOrderSchemaBuffer(): Buffer {
return EIP712Utils.compileSchema(EIP712_ORDER_SCHEMA);
},
};
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