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import { schemas, SchemaValidator } from '@0xproject/json-schemas';
import { Order, SignedOrder } from '@0xproject/types';
import { BigNumber } from '@0xproject/utils';
import * as ethUtil from 'ethereumjs-util';
import * as _ from 'lodash';
import { assert } from './assert';
import { crypto } from './crypto';
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 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 = this.getOrderHashBuff(order);
const orderHashHex = `0x${orderHashBuff.toString('hex')}`;
return orderHashHex;
},
/**
* Computes the orderHash for a supplied order and returns it as a Buffer
* @param order An object that conforms to the Order or SignedOrder interface definitions.
* @return The resulting orderHash from hashing the supplied order as a Buffer
*/
getOrderHashBuff(order: SignedOrder | Order): Buffer {
const makerAssetDataHash = crypto.solSHA3([ethUtil.toBuffer(order.makerAssetData)]);
const takerAssetDataHash = crypto.solSHA3([ethUtil.toBuffer(order.takerAssetData)]);
const orderParamsHashBuff = crypto.solSHA3([
order.makerAddress,
order.takerAddress,
order.feeRecipientAddress,
order.senderAddress,
order.makerAssetAmount,
order.takerAssetAmount,
order.makerFee,
order.takerFee,
order.expirationTimeSeconds,
order.salt,
makerAssetDataHash,
takerAssetDataHash,
]);
const orderParamsHashHex = `0x${orderParamsHashBuff.toString('hex')}`;
const orderSchemaHashHex = this._getOrderSchemaHex();
const domainSeparatorHashHex = this._getDomainSeparatorHashHex(order.exchangeAddress);
const domainSeparatorSchemaHex = this._getDomainSeparatorSchemaHex();
const orderHashBuff = crypto.solSHA3([
new BigNumber(domainSeparatorSchemaHex),
new BigNumber(domainSeparatorHashHex),
new BigNumber(orderSchemaHashHex),
new BigNumber(orderParamsHashHex),
]);
return orderHashBuff;
},
_getOrderSchemaHex(): string {
const orderSchemaHashBuff = crypto.solSHA3([
'Order(',
'address makerAddress,',
'address takerAddress,',
'address feeRecipientAddress,',
'address senderAddress,',
'uint256 makerAssetAmount,',
'uint256 takerAssetAmount,',
'uint256 makerFee,',
'uint256 takerFee,',
'uint256 expirationTimeSeconds,',
'uint256 salt,',
'bytes makerAssetData,',
'bytes takerAssetData,',
')',
]);
const schemaHashHex = `0x${orderSchemaHashBuff.toString('hex')}`;
return schemaHashHex;
},
_getDomainSeparatorSchemaHex(): string {
const domainSeparatorSchemaHashBuff = crypto.solSHA3(['DomainSeparator(address contract)']);
const schemaHashHex = `0x${domainSeparatorSchemaHashBuff.toString('hex')}`;
return schemaHashHex;
},
_getDomainSeparatorHashHex(exchangeAddress: string): string {
const domainSeparatorHashBuff = crypto.solSHA3([exchangeAddress]);
const domainSeparatorHashHex = `0x${domainSeparatorHashBuff.toString('hex')}`;
return domainSeparatorHashHex;
},
};
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