Check that assetProxy exists before attempting transfer

3 files changed, 48 insertions, 27 deletions

diff --git a/packages/contracts/src/contracts/current/protocol/AssetProxy/MixinERC721Transfer.sol b/packages/contracts/src/contracts/current/protocol/AssetProxy/MixinERC721Transfer.sol
index 9dc9e6525..6e3156e8a 100644
--- a/packages/contracts/src/contracts/current/protocol/AssetProxy/MixinERC721Transfer.sol
+++ b/packages/contracts/src/contracts/current/protocol/AssetProxy/MixinERC721Transfer.sol
@@ -53,7 +53,12 @@ contract MixinERC721Transfer is
             bytes memory receiverData
         ) = decodeERC721AssetData(assetData);
 
-        ERC721Token(token).safeTransferFrom(from, to, tokenId, receiverData);
+        ERC721Token(token).safeTransferFrom(
+            from,
+            to,
+            tokenId,
+            receiverData
+        );
     }
 
     /// @dev Decodes ERC721 Asset data.
diff --git a/packages/contracts/src/contracts/current/protocol/Exchange/MixinAssetProxyDispatcher.sol b/packages/contracts/src/contracts/current/protocol/Exchange/MixinAssetProxyDispatcher.sol
index 9e0246303..f85019012 100644
--- a/packages/contracts/src/contracts/current/protocol/Exchange/MixinAssetProxyDispatcher.sol
+++ b/packages/contracts/src/contracts/current/protocol/Exchange/MixinAssetProxyDispatcher.sol
@@ -47,7 +47,7 @@ contract MixinAssetProxyDispatcher is
         onlyOwner
     {
         // Ensure the existing asset proxy is not unintentionally overwritten
-        address currentAssetProxy = address(assetProxies[assetProxyId]);
+        address currentAssetProxy = assetProxies[assetProxyId];
         require(
             oldAssetProxy == currentAssetProxy,
             ASSET_PROXY_MISMATCH
@@ -66,7 +66,11 @@ contract MixinAssetProxyDispatcher is
 
         // Add asset proxy and log registration.
         assetProxies[assetProxyId] = assetProxy;
-        emit AssetProxySet(assetProxyId, newAssetProxy, oldAssetProxy);
+        emit AssetProxySet(
+            assetProxyId,
+            newAssetProxy,
+            oldAssetProxy
+        );
     }
 
     /// @dev Gets an asset proxy.
@@ -77,8 +81,7 @@ contract MixinAssetProxyDispatcher is
         view
         returns (address)
     {
-        address assetProxy = address(assetProxies[assetProxyId]);
-        return assetProxy;
+        return assetProxies[assetProxyId];
     }
 
     /// @dev Forwards arguments to assetProxy and calls `transferFrom`. Either succeeds or throws.
@@ -100,8 +103,18 @@ contract MixinAssetProxyDispatcher is
         if (amount > 0) {
             // Lookup assetProxy
             IAssetProxy assetProxy = assetProxies[assetProxyId];
+            // Ensure that assetProxy exists
+            require(
+                assetProxy != address(0),
+                ASSET_PROXY_DOES_NOT_EXIST
+            );
             // transferFrom will either succeed or throw.
-            assetProxy.transferFrom(assetData, from, to, amount);
+            assetProxy.transferFrom(
+                assetData,
+                from,
+                to,
+                amount
+            );
         }
     }
 }
diff --git a/packages/contracts/src/contracts/current/protocol/Exchange/libs/LibExchangeErrors.sol b/packages/contracts/src/contracts/current/protocol/Exchange/libs/LibExchangeErrors.sol
index aab428e74..a43f0f927 100644
--- a/packages/contracts/src/contracts/current/protocol/Exchange/libs/LibExchangeErrors.sol
+++ b/packages/contracts/src/contracts/current/protocol/Exchange/libs/LibExchangeErrors.sol
@@ -20,42 +20,45 @@ pragma solidity ^0.4.24;
 
 contract LibExchangeErrors {
     /// Order validation errors ///
-    string constant ORDER_UNFILLABLE = "ORDER_UNFILLABLE";                  // Order cannot be filled.
-    string constant INVALID_MAKER = "INVALID_MAKER";                        // Invalid makerAddress.
-    string constant INVALID_TAKER = "INVALID_TAKER";                        // Invalid takerAddress.
-    string constant INVALID_SENDER = "INVALID_SENDER";                      // Invalid `msg.sender`.
-    string constant INVALID_ORDER_SIGNATURE = "INVALID_ORDER_SIGNATURE";    // Signature validation failed. 
+    string constant ORDER_UNFILLABLE = "ORDER_UNFILLABLE";                              // Order cannot be filled.
+    string constant INVALID_MAKER = "INVALID_MAKER";                                    // Invalid makerAddress.
+    string constant INVALID_TAKER = "INVALID_TAKER";                                    // Invalid takerAddress.
+    string constant INVALID_SENDER = "INVALID_SENDER";                                  // Invalid `msg.sender`.
+    string constant INVALID_ORDER_SIGNATURE = "INVALID_ORDER_SIGNATURE";                // Signature validation failed. 
     
     /// fillOrder validation errors ///
-    string constant INVALID_TAKER_AMOUNT = "INVALID_TAKER_AMOUNT";          // takerAssetFillAmount cannot equal 0.
-    string constant ROUNDING_ERROR = "ROUNDING_ERROR";                      // Rounding error greater than 0.1% of takerAssetFillAmount. 
+    string constant INVALID_TAKER_AMOUNT = "INVALID_TAKER_AMOUNT";                      // takerAssetFillAmount cannot equal 0.
+    string constant ROUNDING_ERROR = "ROUNDING_ERROR";                                  // Rounding error greater than 0.1% of takerAssetFillAmount. 
     
     /// Signature validation errors ///
-    string constant INVALID_SIGNATURE = "INVALID_SIGNATURE";                // Signature validation failed. 
-    string constant SIGNATURE_ILLEGAL = "SIGNATURE_ILLEGAL";                // Signature type is illegal.
-    string constant SIGNATURE_UNSUPPORTED = "SIGNATURE_UNSUPPORTED";        // Signature type unsupported.
+    string constant INVALID_SIGNATURE = "INVALID_SIGNATURE";                            // Signature validation failed. 
+    string constant SIGNATURE_ILLEGAL = "SIGNATURE_ILLEGAL";                            // Signature type is illegal.
+    string constant SIGNATURE_UNSUPPORTED = "SIGNATURE_UNSUPPORTED";                    // Signature type unsupported.
     
     /// cancelOrdersUptTo errors ///
-    string constant INVALID_NEW_ORDER_EPOCH = "INVALID_NEW_ORDER_EPOCH";    // Specified salt must be greater than or equal to existing orderEpoch.
+    string constant INVALID_NEW_ORDER_EPOCH = "INVALID_NEW_ORDER_EPOCH";                // Specified salt must be greater than or equal to existing orderEpoch.
 
     /// fillOrKillOrder errors ///
-    string constant COMPLETE_FILL_FAILED = "COMPLETE_FILL_FAILED";          // Desired takerAssetFillAmount could not be completely filled. 
+    string constant COMPLETE_FILL_FAILED = "COMPLETE_FILL_FAILED";                      // Desired takerAssetFillAmount could not be completely filled. 
 
     /// matchOrders errors ///
-    string constant NEGATIVE_SPREAD_REQUIRED = "NEGATIVE_SPREAD_REQUIRED";  // Matched orders must have a negative spread.
+    string constant NEGATIVE_SPREAD_REQUIRED = "NEGATIVE_SPREAD_REQUIRED";              // Matched orders must have a negative spread.
 
     /// Transaction errors ///
-    string constant REENTRANCY_ILLEGAL = "REENTRANCY_ILLEGAL";              // Recursive reentrancy is not allowed. 
-    string constant INVALID_TX_HASH = "INVALID_TX_HASH";                    // Transaction has already been executed. 
-    string constant INVALID_TX_SIGNATURE = "INVALID_TX_SIGNATURE";          // Signature validation failed. 
-    string constant FAILED_EXECUTION = "FAILED_EXECUTION";                  // Transaction execution failed. 
+    string constant REENTRANCY_ILLEGAL = "REENTRANCY_ILLEGAL";                          // Recursive reentrancy is not allowed. 
+    string constant INVALID_TX_HASH = "INVALID_TX_HASH";                                // Transaction has already been executed. 
+    string constant INVALID_TX_SIGNATURE = "INVALID_TX_SIGNATURE";                      // Signature validation failed. 
+    string constant FAILED_EXECUTION = "FAILED_EXECUTION";                              // Transaction execution failed. 
     
     /// registerAssetProxy errors ///
-    string constant ASSET_PROXY_MISMATCH = "ASSET_PROXY_MISMATCH";          // oldAssetProxy proxy does not match currentAssetProxy. 
-    string constant ASSET_PROXY_ID_MISMATCH = "ASSET_PROXY_ID_MISMATCH";    // newAssetProxyId does not match given assetProxyId.
+    string constant ASSET_PROXY_MISMATCH = "ASSET_PROXY_MISMATCH";                      // oldAssetProxy proxy does not match currentAssetProxy. 
+    string constant ASSET_PROXY_ID_MISMATCH = "ASSET_PROXY_ID_MISMATCH";                // newAssetProxyId does not match given assetProxyId.
+
+    /// dispatchTransferFrom errors ///
+    string constant ASSET_PROXY_DOES_NOT_EXIST = "ASSET_PROXY_DOES_NOT_EXIST";          // No assetProxy registered at given id.
 
     /// Length validation errors ///
     string constant LENGTH_GREATER_THAN_0_REQUIRED = "LENGTH_GREATER_THAN_0_REQUIRED";  // Byte array must have a length greater than 0.
-    string constant LENGTH_0_REQUIRED = "LENGTH_0_REQUIRED";                // Byte array must have a length of 0.
-    string constant LENGTH_65_REQUIRED = "LENGTH_65_REQUIRED";              // Byte array must have a length of 65.
+    string constant LENGTH_0_REQUIRED = "LENGTH_0_REQUIRED";                            // Byte array must have a length of 0.
+    string constant LENGTH_65_REQUIRED = "LENGTH_65_REQUIRED";                          // Byte array must have a length of 65.
 }