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126 changes: 126 additions & 0 deletions
126
contracts/asset-proxy/contracts/src/ERC20BridgeProxy.sol
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| /* | ||
| Copyright 2019 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 ^0.5.9; | ||
| pragma experimental ABIEncoderV2; | ||
|
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| import "@0x/contracts-utils/contracts/src/LibBytes.sol"; | ||
| import "@0x/contracts-utils/contracts/src/LibSafeMath.sol"; | ||
| import "@0x/contracts-utils/contracts/src/Authorizable.sol"; | ||
| import "@0x/contracts-erc20/contracts/src/interfaces/IERC20Token.sol"; | ||
| import "./interfaces/IAssetProxy.sol"; | ||
| import "./interfaces/IERC20Bridge.sol"; | ||
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| contract ERC20BridgeProxy is | ||
| IAssetProxy, | ||
| Authorizable | ||
| { | ||
| using LibBytes for bytes; | ||
| using LibSafeMath for uint256; | ||
|
|
||
| // @dev Id of this proxy. Also the result of a successful bridge call. | ||
| // bytes4(keccak256("ERC20Bridge(address,address,bytes)")) | ||
| bytes4 constant private PROXY_ID = 0xdc1600f3; | ||
|
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| /// @dev Calls a bridge contract to transfer `amount` of ERC20 from `from` | ||
| /// to `to`. Asserts that the balance of `to` has increased by `amount`. | ||
| /// @param assetData Abi-encoded data for this asset proxy encoded as: | ||
| /// abi.encodeWithSelector( | ||
| /// bytes4 PROXY_ID, | ||
| /// address tokenAddress, | ||
| /// address bridgeAddress, | ||
| /// bytes bridgeData | ||
| /// ) | ||
| /// @param from Address to transfer asset from. | ||
| /// @param to Address to transfer asset to. | ||
| /// @param amount Amount of asset to transfer. | ||
| function transferFrom( | ||
| bytes calldata assetData, | ||
| address from, | ||
| address to, | ||
| uint256 amount | ||
| ) | ||
| external | ||
| onlyAuthorized | ||
| { | ||
| // Extract asset data fields. | ||
| ( | ||
| address tokenAddress, | ||
| address bridgeAddress, | ||
| bytes memory bridgeData | ||
| ) = abi.decode( | ||
| assetData.sliceDestructive(4, assetData.length), | ||
| (address, address, bytes) | ||
| ); | ||
|
|
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| // Remember the balance of `to` before calling the bridge. | ||
| uint256 balanceBefore = balanceOf(tokenAddress, to); | ||
| // Call the bridge, who should transfer `amount` of `tokenAddress` to | ||
| // `to`. | ||
| bytes4 success = IERC20Bridge(bridgeAddress).withdrawTo( | ||
| tokenAddress, | ||
| from, | ||
| to, | ||
| amount, | ||
| bridgeData | ||
| ); | ||
| // Bridge must return the proxy ID to indicate success. | ||
| require(success == PROXY_ID, "BRIDGE_FAILED"); | ||
| // Ensure that the balance of `to` has increased by at least `amount`. | ||
| require( | ||
| balanceBefore.safeAdd(amount) <= balanceOf(tokenAddress, to), | ||
| "BRIDGE_UNDERPAY" | ||
| ); | ||
| } | ||
|
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| /// @dev Gets the proxy id associated with this asset proxy. | ||
| /// @return proxyId The proxy id. | ||
| function getProxyId() | ||
| external | ||
| pure | ||
| returns (bytes4 proxyId) | ||
| { | ||
| return PROXY_ID; | ||
| } | ||
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| /// @dev Retrieves the balance of `owner` for this asset. | ||
| /// @return balance The balance of the ERC20 token being transferred by this | ||
| /// asset proxy. | ||
| function balanceOf(bytes calldata assetData, address owner) | ||
| external | ||
| view | ||
| returns (uint256 balance) | ||
| { | ||
| (address tokenAddress) = abi.decode( | ||
| assetData.sliceDestructive(4, assetData.length), | ||
| (address) | ||
| ); | ||
| return balanceOf(tokenAddress, owner); | ||
| } | ||
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| /// @dev Retrieves the balance of `owner` given an ERC20 address. | ||
| /// @return balance The balance of the ERC20 token for `owner`. | ||
| function balanceOf(address tokenAddress, address owner) | ||
| private | ||
| view | ||
| returns (uint256 balance) | ||
| { | ||
| return IERC20Token(tokenAddress).balanceOf(owner); | ||
| } | ||
| } |
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