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Diffstat (limited to 'packages/contracts/contracts/protocol/Exchange/MixinAssetProxyDispatcher.sol')
| -rw-r--r-- | packages/contracts/contracts/protocol/Exchange/MixinAssetProxyDispatcher.sol | 174 |
1 files changed, 0 insertions, 174 deletions
diff --git a/packages/contracts/contracts/protocol/Exchange/MixinAssetProxyDispatcher.sol b/packages/contracts/contracts/protocol/Exchange/MixinAssetProxyDispatcher.sol deleted file mode 100644 index 87b09b6b3..000000000 --- a/packages/contracts/contracts/protocol/Exchange/MixinAssetProxyDispatcher.sol +++ /dev/null @@ -1,174 +0,0 @@ -/* - - Copyright 2018 ZeroEx Intl. - - Licensed under the Apache License, Version 2.0 (the "License"); - you may not use this file except in compliance with the License. - You may obtain a copy of the License at - - http://www.apache.org/licenses/LICENSE-2.0 - - Unless required by applicable law or agreed to in writing, software - distributed under the License is distributed on an "AS IS" BASIS, - WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - See the License for the specific language governing permissions and - limitations under the License. - -*/ - -pragma solidity 0.4.24; - -import "../../utils/Ownable/Ownable.sol"; -import "./mixins/MAssetProxyDispatcher.sol"; -import "../AssetProxy/interfaces/IAssetProxy.sol"; - - -contract MixinAssetProxyDispatcher is - Ownable, - MAssetProxyDispatcher -{ - // Mapping from Asset Proxy Id's to their respective Asset Proxy - mapping (bytes4 => IAssetProxy) public assetProxies; - - /// @dev Registers an asset proxy to its asset proxy id. - /// Once an asset proxy is registered, it cannot be unregistered. - /// @param assetProxy Address of new asset proxy to register. - function registerAssetProxy(address assetProxy) - external - onlyOwner - { - IAssetProxy assetProxyContract = IAssetProxy(assetProxy); - - // Ensure that no asset proxy exists with current id. - bytes4 assetProxyId = assetProxyContract.getProxyId(); - address currentAssetProxy = assetProxies[assetProxyId]; - require( - currentAssetProxy == address(0), - "ASSET_PROXY_ALREADY_EXISTS" - ); - - // Add asset proxy and log registration. - assetProxies[assetProxyId] = assetProxyContract; - emit AssetProxyRegistered( - assetProxyId, - assetProxy - ); - } - - /// @dev Gets an asset proxy. - /// @param assetProxyId Id of the asset proxy. - /// @return The asset proxy registered to assetProxyId. Returns 0x0 if no proxy is registered. - function getAssetProxy(bytes4 assetProxyId) - external - view - returns (address) - { - return assetProxies[assetProxyId]; - } - - /// @dev Forwards arguments to assetProxy and calls `transferFrom`. Either succeeds or throws. - /// @param assetData Byte array encoded for the asset. - /// @param from Address to transfer token from. - /// @param to Address to transfer token to. - /// @param amount Amount of token to transfer. - function dispatchTransferFrom( - bytes memory assetData, - address from, - address to, - uint256 amount - ) - internal - { - // Do nothing if no amount should be transferred. - if (amount > 0 && from != to) { - // Ensure assetData length is valid - require( - assetData.length > 3, - "LENGTH_GREATER_THAN_3_REQUIRED" - ); - - // Lookup assetProxy. We do not use `LibBytes.readBytes4` for gas efficiency reasons. - bytes4 assetProxyId; - assembly { - assetProxyId := and(mload( - add(assetData, 32)), - 0xFFFFFFFF00000000000000000000000000000000000000000000000000000000 - ) - } - address assetProxy = assetProxies[assetProxyId]; - - // Ensure that assetProxy exists - require( - assetProxy != address(0), - "ASSET_PROXY_DOES_NOT_EXIST" - ); - - // We construct calldata for the `assetProxy.transferFrom` ABI. - // The layout of this calldata is in the table below. - // - // | Area | Offset | Length | Contents | - // | -------- |--------|---------|-------------------------------------------- | - // | Header | 0 | 4 | function selector | - // | Params | | 4 * 32 | function parameters: | - // | | 4 | | 1. offset to assetData (*) | - // | | 36 | | 2. from | - // | | 68 | | 3. to | - // | | 100 | | 4. amount | - // | Data | | | assetData: | - // | | 132 | 32 | assetData Length | - // | | 164 | ** | assetData Contents | - - assembly { - /////// Setup State /////// - // `cdStart` is the start of the calldata for `assetProxy.transferFrom` (equal to free memory ptr). - let cdStart := mload(64) - // `dataAreaLength` is the total number of words needed to store `assetData` - // As-per the ABI spec, this value is padded up to the nearest multiple of 32, - // and includes 32-bytes for length. - let dataAreaLength := and(add(mload(assetData), 63), 0xFFFFFFFFFFFE0) - // `cdEnd` is the end of the calldata for `assetProxy.transferFrom`. - let cdEnd := add(cdStart, add(132, dataAreaLength)) - - - /////// Setup Header Area /////// - // This area holds the 4-byte `transferFromSelector`. - // bytes4(keccak256("transferFrom(bytes,address,address,uint256)")) = 0xa85e59e4 - mstore(cdStart, 0xa85e59e400000000000000000000000000000000000000000000000000000000) - - /////// Setup Params Area /////// - // Each parameter is padded to 32-bytes. The entire Params Area is 128 bytes. - // Notes: - // 1. The offset to `assetData` is the length of the Params Area (128 bytes). - // 2. A 20-byte mask is applied to addresses to zero-out the unused bytes. - mstore(add(cdStart, 4), 128) - mstore(add(cdStart, 36), and(from, 0xffffffffffffffffffffffffffffffffffffffff)) - mstore(add(cdStart, 68), and(to, 0xffffffffffffffffffffffffffffffffffffffff)) - mstore(add(cdStart, 100), amount) - - /////// Setup Data Area /////// - // This area holds `assetData`. - let dataArea := add(cdStart, 132) - // solhint-disable-next-line no-empty-blocks - for {} lt(dataArea, cdEnd) {} { - mstore(dataArea, mload(assetData)) - dataArea := add(dataArea, 32) - assetData := add(assetData, 32) - } - - /////// Call `assetProxy.transferFrom` using the constructed calldata /////// - let success := call( - gas, // forward all gas - assetProxy, // call address of asset proxy - 0, // don't send any ETH - cdStart, // pointer to start of input - sub(cdEnd, cdStart), // length of input - cdStart, // write output over input - 512 // reserve 512 bytes for output - ) - if iszero(success) { - revert(cdStart, returndatasize()) - } - } - } - } -} |