Port isValidOrderHash and tests

1 files changed, 6 insertions, 0 deletions

diff --git a/src/ts/utils/assert.ts b/src/ts/utils/assert.ts
index a29ae922d..602361233 100644
--- a/src/ts/utils/assert.ts
+++ b/src/ts/utils/assert.ts
@@ -2,6 +2,8 @@ import * as _ from 'lodash';
 import * as BigNumber from 'bignumber.js';
 import Web3 = require('web3');
 
+const HEX_REGEX = /^0x([0-9A-F]{2})*$/i;
+
 export const assert = {
     isBigNumber(variableName: string, value: BigNumber.BigNumber) {
         const isBigNumber = _.isObject(value) && value.isBigNumber;
@@ -10,6 +12,10 @@ export const assert = {
     isString(variableName: string, value: string) {
         this.assert(_.isString(value), this.typeAssertionMessage(variableName, 'string', value));
     },
+    isHexString(variableName: string, value: string) {
+        this.assert(_.isString(value) && HEX_REGEX.test(value),
+            this.typeAssertionMessage(variableName, 'HexString', value));
+    },
     isETHAddressHex(variableName: string, value: ETHAddressHex) {
         const web3 = new Web3();
         this.assert(web3.isAddress(value), this.typeAssertionMessage(variableName, 'ETHAddressHex', value));