Add batchTransferFrom to asset proxies

packages/contracts/src/contracts/current/protocol/AssetProxy/IAssetProxy.sol

@@ -17,6 +17,7 @@
 */
 
 pragma solidity ^0.4.21;
+pragma experimental ABIEncoderV2;
 
 import "../../utils/Authorizable/IAuthorizable.sol";
 
@@ -24,9 +25,9 @@ contract IAssetProxy is IAuthorizable {
 
     /// @dev Transfers assets. Either succeeds or throws.
     /// @param assetMetadata Byte array encoded for the respective asset proxy.
-    /// @param from Address to transfer token from.
+    /// @param from Address to transfer asset from.
-    /// @param to Address to transfer token to.
+    /// @param to Address to transfer asset to.
-    /// @param amount Amount of token to transfer.
+    /// @param amount Amount of asset to transfer.
     function transferFrom(
         bytes assetMetadata,
         address from,
@@ -34,6 +35,18 @@ contract IAssetProxy is IAuthorizable {
         uint256 amount)
         external;
     
+    /// @dev Makes multiple transfers of assets. Either succeeds or throws.
+    /// @param assetMetadata Array of byte arrays encoded for the respective asset proxy.
+    /// @param from Array of addresses to transfer assets from.
+    /// @param to Array of addresses to transfer assets to.
+    /// @param amounts Array of amounts of assets to transfer.
+    function batchTransferFrom(
+        bytes[] memory assetMetadata,
+        address[] memory from,
+        address[] memory to,
+        uint256[] memory amounts)
+        public;
+
     /// @dev Gets the proxy id associated with the proxy address.
     /// @return Proxy id.
     function getProxyId()
@@ -41,3 +54,4 @@ contract IAssetProxy is IAuthorizable {
         view
         returns (uint8);
 }
+

packages/contracts/src/contracts/current/protocol/AssetProxy/proxies/ERC20Proxy.sol

@@ -17,6 +17,7 @@
 */
 
 pragma solidity ^0.4.21;
+pragma experimental ABIEncoderV2;
 
 import "../IAssetProxy.sol";
 import "../../../utils/LibBytes/LibBytes.sol";
@@ -33,9 +34,9 @@ contract ERC20Proxy is
 
     /// @dev Transfers ERC20 tokens. Either succeeds or throws.
     /// @param assetMetadata ERC20-encoded byte array.
-    /// @param from Address to transfer token from.
+    /// @param from Address to transfer asset from.
-    /// @param to Address to transfer token to.
+    /// @param to Address to transfer asset to.
-    /// @param amount Amount of token to transfer.
+    /// @param amount Amount of asset to transfer.
     function transferFrom(
         bytes assetMetadata,
         address from,
@@ -43,6 +44,49 @@ contract ERC20Proxy is
         uint256 amount)
         external
         onlyAuthorized
+    {
+        transferFromInternal(
+            assetMetadata,
+            from,
+            to,
+            amount
+        );
+    }
+
+    /// @dev Makes multiple transfers of assets. Either succeeds or throws.
+    /// @param assetMetadata Array of byte arrays encoded for the respective asset proxy.
+    /// @param from Array of addresses to transfer assets from.
+    /// @param to Array of addresses to transfer assets to.
+    /// @param amounts Array of amounts of assets to transfer.
+    function batchTransferFrom(
+        bytes[] memory assetMetadata,
+        address[] memory from,
+        address[] memory to,
+        uint256[] memory amounts)
+        public
+        onlyAuthorized
+    {
+        for (uint256 i = 0; i < assetMetadata.length; i++) {
+            transferFromInternal(
+                assetMetadata[i],
+                from[i],
+                to[i],
+                amounts[i]
+            );
+        }
+    }
+
+    /// @dev Internal version of `transferFrom`.
+    /// @param assetMetadata ERC20-encoded byte array.
+    /// @param from Address to transfer asset from.
+    /// @param to Address to transfer asset to.
+    /// @param amount Amount of asset to transfer.
+    function transferFromInternal(
+        bytes memory assetMetadata,
+        address from,
+        address to,
+        uint256 amount)
+        internal
     {
         // Data must be intended for this proxy.
         require(uint8(assetMetadata[0]) == PROXY_ID);

packages/contracts/src/contracts/current/protocol/AssetProxy/proxies/ERC721Proxy.sol

@@ -17,6 +17,7 @@
 */
 
 pragma solidity ^0.4.21;
+pragma experimental ABIEncoderV2;
 
 import "../IAssetProxy.sol";
 import "../../../utils/LibBytes/LibBytes.sol";
@@ -33,9 +34,9 @@ contract ERC721Proxy is
 
     /// @dev Transfers ERC721 tokens. Either succeeds or throws.
     /// @param assetMetadata ERC721-encoded byte array
-    /// @param from Address to transfer token from.
+    /// @param from Address to transfer asset from.
-    /// @param to Address to transfer token to.
+    /// @param to Address to transfer asset to.
-    /// @param amount Amount of token to transfer.
+    /// @param amount Amount of asset to transfer.
     function transferFrom(
         bytes assetMetadata,
         address from,
@@ -43,6 +44,49 @@ contract ERC721Proxy is
         uint256 amount)
         external
         onlyAuthorized
+    {
+        transferFromInternal(
+            assetMetadata,
+            from,
+            to,
+            amount
+        );
+    }
+
+    /// @dev Makes multiple transfers of assets. Either succeeds or throws.
+    /// @param assetMetadata Array of byte arrays encoded for the respective asset proxy.
+    /// @param from Array of addresses to transfer assets from.
+    /// @param to Array of addresses to transfer assets to.
+    /// @param amounts Array of amounts of assets to transfer.
+    function batchTransferFrom(
+        bytes[] memory assetMetadata,
+        address[] memory from,
+        address[] memory to,
+        uint256[] memory amounts)
+        public
+        onlyAuthorized
+    {
+        for (uint256 i = 0; i < assetMetadata.length; i++) {
+            transferFromInternal(
+                assetMetadata[i],
+                from[i],
+                to[i],
+                amounts[i]
+            );
+        }
+    }
+
+    /// @dev Internal version of `transferFrom`.
+    /// @param assetMetadata ERC20-encoded byte array.
+    /// @param from Address to transfer asset from.
+    /// @param to Address to transfer asset to.
+    /// @param amount Amount of asset to transfer.
+    function transferFromInternal(
+        bytes memory assetMetadata,
+        address from,
+        address to,
+        uint256 amount)
+        internal
     {
         // Data must be intended for this proxy.
         require(uint8(assetMetadata[0]) == PROXY_ID);