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import { schemas, SchemaValidator } from '@0x/json-schemas';
import { Order, SignedOrder } from '@0x/types';
import { signTypedDataUtils } from '@0x/utils';
import * as _ from 'lodash';
import { assert } from './assert';
import { eip712Utils } from './eip712_utils';
const INVALID_TAKER_FORMAT = 'instance.takerAddress is not of a type(s) string';
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 Hex encoded string 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
* @param order An object that conforms to the Order or SignedOrder interface definitions.
* @return A Buffer containing the resulting orderHash from hashing the supplied order
*/
getOrderHashBuffer(order: SignedOrder | Order): Buffer {
const typedData = eip712Utils.createOrderTypedData(order);
const orderHashBuff = signTypedDataUtils.generateTypedDataHash(typedData);
return orderHashBuff;
},
};
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