3 files changed, 76 insertions, 18 deletions

diff --git a/packages/0x.js/CHANGELOG.md b/packages/0x.js/CHANGELOG.md
index c18915417..63c82ac94 100644
--- a/packages/0x.js/CHANGELOG.md
+++ b/packages/0x.js/CHANGELOG.md
@@ -4,6 +4,8 @@ Edit the package's CHANGELOG.json file only.
 -->
 
 CHANGELOG
+## v0.36.0 - TBD
+    * Add `zeroEx.exchange.getOrderStateAsync` to allow obtaining current OrderState for a signedOrder
 
 ## v0.35.0 - _April 2, 2018_
 
diff --git a/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts b/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts
index 378ae8111..fb1877f4a 100644
--- a/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts
@@ -13,35 +13,38 @@ import { Web3Wrapper } from '@0xproject/web3-wrapper';
 import * as _ from 'lodash';
 
 import { artifacts } from '../artifacts';
+import { BalanceAndProxyAllowanceLazyStore } from '../stores/balance_proxy_allowance_lazy_store';
+import { OrderFilledCancelledLazyStore } from '../stores/order_filled_cancelled_lazy_store';
 import {
-    BlockRange,
-    EventCallback,
-    ExchangeContractErrCodes,
-    ExchangeContractErrs,
-    IndexedFilterValues,
-    MethodOpts,
-    OrderAddresses,
-    OrderCancellationRequest,
-    OrderFillRequest,
-    OrderTransactionOpts,
-    OrderValues,
-    ValidateOrderFillableOpts,
+BlockRange,
+EventCallback,
+ExchangeContractErrCodes,
+ExchangeContractErrs,
+IndexedFilterValues,
+MethodOpts,
+OrderAddresses,
+OrderCancellationRequest,
+OrderFillRequest,
+OrderState,
+OrderTransactionOpts,
+OrderValues,
+ValidateOrderFillableOpts,
 } from '../types';
 import { assert } from '../utils/assert';
 import { decorators } from '../utils/decorators';
 import { ExchangeTransferSimulator } from '../utils/exchange_transfer_simulator';
+import { OrderStateUtils } from '../utils/order_state_utils';
 import { OrderValidationUtils } from '../utils/order_validation_utils';
 import { utils } from '../utils/utils';
 
 import { ContractWrapper } from './contract_wrapper';
 import {
-    ExchangeContract,
-    ExchangeContractEventArgs,
-    ExchangeEvents,
-    LogErrorContractEventArgs,
+ExchangeContract,
+ExchangeContractEventArgs,
+ExchangeEvents,
+LogErrorContractEventArgs,
 } from './generated/exchange';
 import { TokenWrapper } from './token_wrapper';
-
 const SHOULD_VALIDATE_BY_DEFAULT = true;
 
 interface ExchangeContractErrCodesToMsgs {
@@ -874,6 +877,22 @@ export class ExchangeWrapper extends ContractWrapper {
         }
     }
     /**
+     * Gets the latest OrderState of a signedOrder
+     * @param   signedOrder   The signedOrder
+     */
+    public async getOrderStateAsync(signedOrder: SignedOrder): Promise<OrderState> {
+        const balanceAndProxyAllowanceLazyStore = new BalanceAndProxyAllowanceLazyStore(
+            this._tokenWrapper,
+            BlockParamLiteral.Latest,
+        );
+        const orderFilledCancelledLazyStore = new OrderFilledCancelledLazyStore(this);
+        const orderStateUtils = new OrderStateUtils(
+            balanceAndProxyAllowanceLazyStore,
+            orderFilledCancelledLazyStore,
+        );
+        return orderStateUtils.getOrderStateAsync(signedOrder);
+    }
+    /**
      * Returns the ZRX token address used by the exchange contract.
      * @return Address of ZRX token
      */
diff --git a/packages/0x.js/test/exchange_wrapper_test.ts b/packages/0x.js/test/exchange_wrapper_test.ts
index cfc390bae..b6eaa2591 100644
--- a/packages/0x.js/test/exchange_wrapper_test.ts
+++ b/packages/0x.js/test/exchange_wrapper_test.ts
@@ -14,7 +14,7 @@ import {
     LogCancelContractEventArgs,
     LogFillContractEventArgs,
     OrderCancellationRequest,
-    OrderFillRequest,
+    OrderFillRequest, OrderState, OrderStateInvalid,
     SignedOrder,
     Token,
     ZeroEx,
@@ -1156,4 +1156,41 @@ describe('ExchangeWrapper', () => {
             expect(args.maker).to.be.equal(differentMakerAddress);
         });
     });
+    describe('#getOrderState', () => {
+        let maker: string;
+        let taker: string;
+        let makerToken: Token;
+        let takerToken: Token;
+        let signedOrder: SignedOrder;
+        let orderState: OrderState;
+        const fillableAmount = ZeroEx.toBaseUnitAmount(new BigNumber(5), constants.ZRX_DECIMALS);
+        before(async () => {
+            [, maker, taker] = userAddresses;
+            tokens = await zeroEx.tokenRegistry.getTokensAsync();
+            [makerToken, takerToken] = tokenUtils.getDummyTokens();
+        });
+        it('should report orderStateValid when order is fillable', async () => {
+            signedOrder = await fillScenarios.createFillableSignedOrderAsync(
+                makerToken.address,
+                takerToken.address,
+                maker,
+                taker,
+                fillableAmount,
+            );
+            orderState = await zeroEx.exchange.getOrderStateAsync(signedOrder);
+            expect(orderState.isValid).to.be.true();
+        });
+        it('should report orderStateInvalid when maker allowance set to 0', async () => {
+            signedOrder = await fillScenarios.createFillableSignedOrderAsync(
+                makerToken.address,
+                takerToken.address,
+                maker,
+                taker,
+                fillableAmount,
+            );
+            await zeroEx.token.setProxyAllowanceAsync(makerToken.address, maker, new BigNumber(0));
+            orderState = await zeroEx.exchange.getOrderStateAsync(signedOrder);
+            expect(orderState.isValid).to.be.false();
+        });
+    });
 }); // tslint:disable:max-file-line-count