From b75fe10c790a60c875914a2a79ae8c4761b78bb9 Mon Sep 17 00:00:00 2001
From: Brandon Millman <brandon.millman@gmail.com>
Date: Wed, 17 Oct 2018 00:49:48 -0700
Subject: feat(contract-wrappers): export ForwarderWrapperError and
 ContractWrapperError.SignatureRequestDenied

---
 packages/contract-wrappers/src/utils/constants.ts  |  1 +
 packages/contract-wrappers/src/utils/decorators.ts | 14 +++++++++++++-
 2 files changed, 14 insertions(+), 1 deletion(-)

(limited to 'packages/contract-wrappers/src/utils')

diff --git a/packages/contract-wrappers/src/utils/constants.ts b/packages/contract-wrappers/src/utils/constants.ts
index 9ff61f62a..b89438592 100644
--- a/packages/contract-wrappers/src/utils/constants.ts
+++ b/packages/contract-wrappers/src/utils/constants.ts
@@ -14,4 +14,5 @@ export const constants = {
     ZERO_AMOUNT: new BigNumber(0),
     ONE_AMOUNT: new BigNumber(1),
     ETHER_TOKEN_DECIMALS: 18,
+    METAMASK_DENIED_SIGNATURE_PATTERN: 'MetaMask Tx Signature: User denied transaction signature',
 };
diff --git a/packages/contract-wrappers/src/utils/decorators.ts b/packages/contract-wrappers/src/utils/decorators.ts
index e17246015..932b11785 100644
--- a/packages/contract-wrappers/src/utils/decorators.ts
+++ b/packages/contract-wrappers/src/utils/decorators.ts
@@ -29,6 +29,14 @@ const schemaErrorTransformer = (error: Error) => {
     return error;
 };
 
+const signatureRequestErrorTransformer = (error: Error) => {
+    if (_.includes(error.message, constants.METAMASK_DENIED_SIGNATURE_PATTERN)) {
+        const errMsg = ContractWrappersError.SignatureRequestDenied;
+        return new Error(errMsg);
+    }
+    return error;
+};
+
 /**
  * Source: https://stackoverflow.com/a/29837695/3546986
  */
@@ -87,7 +95,11 @@ const syncErrorHandlerFactory = (errorTransformer: ErrorTransformer) => {
 };
 
 // _.flow(f, g) = f ∘ g
-const zeroExErrorTransformer = _.flow(schemaErrorTransformer, contractCallErrorTransformer);
+const zeroExErrorTransformer = _.flow(
+    schemaErrorTransformer,
+    contractCallErrorTransformer,
+    signatureRequestErrorTransformer,
+);
 
 export const decorators = {
     asyncZeroExErrorHandler: asyncErrorHandlerFactory(zeroExErrorTransformer),
-- 
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