6 files changed, 44 insertions, 3 deletions
diff --git a/packages/0x.js/package.json b/packages/0x.js/package.json
index 9c7adbbcd..58cd439fd 100644
--- a/packages/0x.js/package.json
+++ b/packages/0x.js/package.json
@@ -24,7 +24,7 @@
         "test:coverage": "nyc npm run test --all && yarn coverage:report:lcov",
         "coverage:report:lcov": "nyc report --reporter=text-lcov > coverage/lcov.info",
         "clean": "shx rm -rf _bundles lib test_temp src/generated_contract_wrappers generated_docs",
-        "build:umd:prod": "NODE_ENV=production webpack",
+        "build:umd:prod": "NODE_ENV=production node --max_old_space_size=8192 ../../node_modules/.bin/webpack --mode production",
         "build:commonjs": "tsc -b",
         "docs:json": "typedoc --excludePrivate --excludeExternals --target ES5 --tsconfig typedoc-tsconfig.json --json $JSON_FILE_PATH $PROJECT_FILES"
     },
diff --git a/packages/contract-wrappers/test/exchange_wrapper_test.ts b/packages/contract-wrappers/test/exchange_wrapper_test.ts
index a1d60dc6e..acd30495b 100644
--- a/packages/contract-wrappers/test/exchange_wrapper_test.ts
+++ b/packages/contract-wrappers/test/exchange_wrapper_test.ts
@@ -1,6 +1,6 @@
 import { BlockchainLifecycle, callbackErrorReporter } from '@0x/dev-utils';
 import { FillScenarios } from '@0x/fill-scenarios';
-import { assetDataUtils, orderHashUtils } from '@0x/order-utils';
+import { assetDataUtils, orderHashUtils, signatureUtils } from '@0x/order-utils';
 import { DoneCallback, RevertReason, SignedOrder } from '@0x/types';
 import { BigNumber } from '@0x/utils';
 import * as chai from 'chai';
@@ -368,6 +368,23 @@ describe('ExchangeWrapper', () => {
             await web3Wrapper.awaitTransactionSuccessAsync(txHash, constants.AWAIT_TRANSACTION_MINED_MS);
             isPreSigned = await contractWrappers.exchange.isPreSignedAsync(hash, signerAddress);
             expect(isPreSigned).to.be.true();
+
+            const preSignedSignature = '0x06';
+            const isValidSignature = await contractWrappers.exchange.isValidSignatureAsync(
+                hash,
+                signerAddress,
+                preSignedSignature,
+            );
+            expect(isValidSignature).to.be.true();
+
+            // Test our TS implementation of signature validation
+            const isValidSignatureInTs = await signatureUtils.isValidSignatureAsync(
+                provider,
+                hash,
+                preSignedSignature,
+                signerAddress,
+            );
+            expect(isValidSignatureInTs).to.be.true();
         });
     });
     describe('#getVersionAsync', () => {
diff --git a/packages/order-utils/CHANGELOG.json b/packages/order-utils/CHANGELOG.json
index 8a104c8ef..8fa0b358c 100644
--- a/packages/order-utils/CHANGELOG.json
+++ b/packages/order-utils/CHANGELOG.json
@@ -5,6 +5,10 @@
             {
                 "note": "Upgrade the bignumber.js to v8.0.2",
                 "pr": 1517
+            },
+            {
+                "note": "Fix preSigned isSignatureValidAsync check",
+                "pr": 1580
             }
         ],
         "timestamp": 1549373905
diff --git a/packages/order-utils/package.json b/packages/order-utils/package.json
index b4b33d6e6..3f14cea5f 100644
--- a/packages/order-utils/package.json
+++ b/packages/order-utils/package.json
@@ -57,6 +57,7 @@
         "@0x/assert": "^2.0.0",
         "@0x/base-contract": "^4.0.0",
         "@0x/contract-artifacts": "^1.3.0",
+        "@0x/contract-addresses": "^2.2.0",
         "@0x/json-schemas": "^3.0.0",
         "@0x/types": "^2.0.0",
         "@0x/typescript-typings": "^4.0.0",
diff --git a/packages/order-utils/src/signature_utils.ts b/packages/order-utils/src/signature_utils.ts
index 131144d48..efcc146bf 100644
--- a/packages/order-utils/src/signature_utils.ts
+++ b/packages/order-utils/src/signature_utils.ts
@@ -1,4 +1,5 @@
 import { ExchangeContract, IValidatorContract, IWalletContract } from '@0x/abi-gen-wrappers';
+import { getContractAddressesForNetworkOrThrow } from '@0x/contract-addresses';
 import * as artifacts from '@0x/contract-artifacts';
 import { schemas } from '@0x/json-schemas';
 import { ECSignature, Order, SignatureType, SignedOrder, ValidatorSignature } from '@0x/types';
@@ -92,7 +93,14 @@ export const signatureUtils = {
         assert.isWeb3Provider('provider', provider);
         assert.isHexString('data', data);
         assert.isETHAddressHex('signerAddress', signerAddress);
-        const exchangeContract = new ExchangeContract(artifacts.Exchange.compilerOutput.abi, signerAddress, provider);
+        const web3Wrapper = new Web3Wrapper(provider);
+        const networkId = await web3Wrapper.getNetworkIdAsync();
+        const addresses = getContractAddressesForNetworkOrThrow(networkId);
+        const exchangeContract = new ExchangeContract(
+            artifacts.Exchange.compilerOutput.abi,
+            addresses.exchange,
+            provider,
+        );
         const isValid = await exchangeContract.preSigned.callAsync(data, signerAddress);
         return isValid;
     },
diff --git a/packages/order-utils/test/signature_utils_test.ts b/packages/order-utils/test/signature_utils_test.ts
index 937382056..44aa729b3 100644
--- a/packages/order-utils/test/signature_utils_test.ts
+++ b/packages/order-utils/test/signature_utils_test.ts
@@ -99,6 +99,17 @@ describe('Signature utils', () => {
             );
             expect(isValidSignatureLocal).to.be.true();
         });
+
+        it('should return false if entry not found in `preSigned` mapping', async () => {
+            const preSignedSignature = '0x06';
+            const isValidPreSignature = await signatureUtils.isValidSignatureAsync(
+                provider,
+                dataHex,
+                preSignedSignature,
+                address,
+            );
+            expect(isValidPreSignature).to.be.false();
+        });
     });
     describe('#isValidECSignature', () => {
         const signature = {