add weth/eth wrap/unwrap support for bancorv3

contracts/zero-ex/contracts/src/transformers/bridges/EthereumBridgeAdapter.sol

@@ -75,6 +75,7 @@ contract EthereumBridgeAdapter is
     constructor(IEtherTokenV06 weth)
         public
         MixinBancor(weth)
+        MixinBancorV3(weth)
         MixinCompound(weth)
         MixinCurve(weth)
         MixinLido(weth)

contracts/zero-ex/contracts/src/transformers/bridges/mixins/MixinBancorV3.sol

@@ -23,6 +23,8 @@ pragma experimental ABIEncoderV2;
 
 import "@0x/contracts-erc20/contracts/src/v06/LibERC20TokenV06.sol";
 import "@0x/contracts-erc20/contracts/src/v06/IERC20TokenV06.sol";
+import "@0x/contracts-erc20/contracts/src/v06/IEtherTokenV06.sol";
+
 
 /*
     BancorV3
@@ -42,25 +44,37 @@ interface IBancorV3 {
         uint256 minReturnAmount,
         uint256 deadline,
         address beneficiary
-    ) external returns (uint256 amount);
+    ) external payable returns (uint256 amount);
 }
 
 contract MixinBancorV3 {
 
     using LibERC20TokenV06 for IERC20TokenV06;
 
+    IERC20TokenV06 constant public BANCORV3_ETH_ADDRESS =
+        IERC20TokenV06(0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE);
+    IEtherTokenV06 private immutable WETH;
+
+    constructor(IEtherTokenV06 weth)
+        public
+    {
+        WETH = weth;
+    }
+
     function _tradeBancorV3(
         IERC20TokenV06 buyToken,
         uint256 sellAmount,
         bytes memory bridgeData
     )
-        public
+        internal
         returns (uint256 amountOut)
 
     {
         IBancorV3 router;
         IERC20TokenV06[] memory path;
         address[] memory _path;
+        uint256 payableAmount = 0;
+
         {
             (router, _path) = abi.decode(bridgeData, (IBancorV3, address[]));
             // To get around `abi.decode()` not supporting interface array types.
@@ -72,11 +86,26 @@ contract MixinBancorV3 {
             path[path.length - 1] == buyToken,
             "MixinBancorV3/LAST_ELEMENT_OF_PATH_MUST_MATCH_OUTPUT_TOKEN"
         );
+
+        //swap WETH->ETH as Bancor only deals in ETH
+        if(_path[0] == address(WETH)) {
+            //withdraw the sell amount of WETH for ETH
+            WETH.withdraw(sellAmount);
+            payableAmount = sellAmount;
+            // set _path[0] to the ETH address if WETH is our buy token
+            _path[0] = address(BANCORV3_ETH_ADDRESS);
+        } else {
             // Grant the BancorV3 router an allowance to sell the first token.
             path[0].approveIfBelow(address(router), sellAmount);
+        }
+
+        // if we are buying WETH we need to swap to ETH and deposit into WETH after the swap
+        if(_path[1] == address(WETH)){
+            _path[1] = address(BANCORV3_ETH_ADDRESS);
+        }
 
 
-        uint256 amountOut = router.tradeBySourceAmount(
+        uint256 amountOut = router.tradeBySourceAmount{value: payableAmount}(
             _path[0],
             _path[1],
              // Sell all tokens we hold.
@@ -89,6 +118,11 @@ contract MixinBancorV3 {
             address(this)
         );
 
+        // if we want to return WETH deposit the ETH amount we sold
+        if(buyToken == WETH){
+            WETH.deposit{value: amountOut}();
+        }
+
         return amountOut;
     }
 }

packages/asset-swapper/package.json

@@ -34,7 +34,8 @@
         "contracts:gen": "contracts-gen generate",
         "contracts:copy": "contracts-gen copy",
         "publish:private": "yarn build && gitpkg publish",
-        "sampler-size": "jq .compilerOutput.evm.deployedBytecode.object  -- test/generated-artifacts/ERC20BridgeSampler.json | echo $(( $(wc -c) / 2 - 1 ))"
+        "sampler-size": "jq .compilerOutput.evm.deployedBytecode.object  -- test/generated-artifacts/ERC20BridgeSampler.json | echo $(( $(wc -c) / 2 - 1 ))",
+        "list:deps": "yarn lerna list -l"
     },
     "config": {
         "publicInterfaceContracts": "ERC20BridgeSampler,BalanceChecker,FakeTaker",

packages/asset-swapper/src/utils/market_operation_utils/orders.ts

@@ -208,6 +208,8 @@ export function getErc20BridgeSourceToBridgeSource(source: ERC20BridgeSource): s
             return encodeBridgeSourceId(BridgeProtocol.Platypus, 'Platypus');
         case ERC20BridgeSource.MeshSwap:
             return encodeBridgeSourceId(BridgeProtocol.UniswapV2, 'MeshSwap');
+        case ERC20BridgeSource.BancorV3:
+            return encodeBridgeSourceId(BridgeProtocol.BancorV3, 'BancorV3');
         default:
             throw new Error(AggregationError.NoBridgeForSource);
     }
@@ -387,7 +389,7 @@ export function createBridgeDataForBridgeOrder(order: OptimizedMarketBridgeOrder
             break;
         case ERC20BridgeSource.BancorV3:
             const bancorV3FillData = (order as OptimizedMarketBridgeOrder<BancorFillData>).fillData;
-            bridgeData = encoder.encode([bancorV3FillData.networkAddress, bancorFillData.path, bancor]);
+            bridgeData = encoder.encode([bancorV3FillData.networkAddress, bancorV3FillData.path]);
             break;
         default:
             throw new Error(AggregationError.NoBridgeForSource);

packages/asset-swapper/src/utils/market_operation_utils/sampler_operations.ts

@@ -713,6 +713,7 @@ export class SamplerOperations {
 
     public getBancorV3SellQuotes(
         networkAddress: string,
+        networkInfoAddress: string,
         path: string[],
         takerFillAmounts: BigNumber[],
     ): SourceQuoteOperation<BancorFillData> {
@@ -721,13 +722,14 @@ export class SamplerOperations {
             fillData: { networkAddress, path},
             contract: this._samplerContract,
             function: this._samplerContract.sampleBuysFromBancorV3,
-            params: [networkAddress, path, takerFillAmounts],
+            params: [networkInfoAddress, path, takerFillAmounts],
         });
     }
 
     // Unimplemented
     public getBancorV3BuyQuotes(
         networkAddress: string,
+        networkInfoAddress: string,
         path: string[],
         makerFillAmounts: BigNumber[],
     ): SourceQuoteOperation<BancorFillData> {
@@ -736,7 +738,7 @@ export class SamplerOperations {
             fillData: { networkAddress, path},
             contract: this._samplerContract,
             function: this._samplerContract.sampleBuysFromBancorV3,
-            params: [networkAddress, path, makerFillAmounts],
+            params: [networkInfoAddress, path, makerFillAmounts],
         });
 
     }
@@ -1710,9 +1712,10 @@ export class SamplerOperations {
                     }
                     case ERC20BridgeSource.BancorV3: {
                         return this.getBancorV3SellQuotes(
+                            BANCORV3_NETWORK_BY_CHAIN_ID[this.chainId],
                             BANCORV3_NETWORK_INFO_BY_CHAIN_ID[this.chainId],
                             [takerToken, makerToken],
-                            takerFillAmounts
+                            takerFillAmounts,
                         );
                     }
                     default:
@@ -2044,10 +2047,11 @@ export class SamplerOperations {
                         );
                     }
                     case ERC20BridgeSource.BancorV3: {
-                        return this.getBancorV3SellQuotes(
+                        return this.getBancorV3BuyQuotes(
+                            BANCORV3_NETWORK_BY_CHAIN_ID[this.chainId],
                             BANCORV3_NETWORK_INFO_BY_CHAIN_ID[this.chainId],
                             [takerToken, makerToken],
-                            makerFillAmounts
+                            makerFillAmounts,
                         );
                     }
                     default: