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author | Fabio Berger <me@fabioberger.com> | 2018-07-02 17:12:01 +0800 |
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committer | Fabio Berger <me@fabioberger.com> | 2018-07-02 17:12:01 +0800 |
commit | de9f0732a09893f035ce8a7e8e01fa1141882a3a (patch) | |
tree | 63d1f0bbc6f9d65576e5d12b379378700eb88567 /packages/contracts/src/2.0.0/protocol/Exchange/MixinAssetProxyDispatcher.sol | |
parent | 20acdbf6c3ba6a62e87a9a496021cb6482c0c03a (diff) | |
parent | b9b00e10d39c3c84bc72892ef37f1313e904414d (diff) | |
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Merge branch 'v2-prototype' into fix/five_decimal_scenario
* v2-prototype: (75 commits)
Update relayer grid tiles to use Text
Fix build
Update file structure
Update 2.0.0 artifacts
Move ledgerhq module declarations to typescript-typings
Export LedgerEthereumClient type in subproviders
Update artifacts
Add logging and updated artifacts
Fix migrations
Run prettier
Add Kovan artifacts
Use ledger subprovider
Add Kovan migrations
Remove state variable from Link component in Portal
Make registerAssetProxy append only
Update staging api link
Change getTransactionReceipt to awaitTransactionMined
Move /docs route to the end
Remove extra call to scrollIntoView for wallet in onboarding
Update expectRevertReasonOrAlwaysFailingTransactionAsync to check status codes
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Diffstat (limited to 'packages/contracts/src/2.0.0/protocol/Exchange/MixinAssetProxyDispatcher.sol')
-rw-r--r-- | packages/contracts/src/2.0.0/protocol/Exchange/MixinAssetProxyDispatcher.sol | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/packages/contracts/src/2.0.0/protocol/Exchange/MixinAssetProxyDispatcher.sol b/packages/contracts/src/2.0.0/protocol/Exchange/MixinAssetProxyDispatcher.sol new file mode 100644 index 000000000..9e9d88ce7 --- /dev/null +++ b/packages/contracts/src/2.0.0/protocol/Exchange/MixinAssetProxyDispatcher.sol @@ -0,0 +1,175 @@ +/* + + 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 "../../utils/LibBytes/LibBytes.sol"; +import "./mixins/MAssetProxyDispatcher.sol"; +import "../AssetProxy/interfaces/IAssetProxy.sol"; + +contract MixinAssetProxyDispatcher is + Ownable, + MAssetProxyDispatcher +{ + using LibBytes for bytes; + + // 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) { + // Ensure assetData length is valid + require( + assetData.length > 3, + "LENGTH_GREATER_THAN_3_REQUIRED" + ); + + // Lookup assetProxy + 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) + 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()) + } + } + } + } +} |