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218 changes: 218 additions & 0 deletions
218
contracts/asset-proxy/contracts/src/bridges/UniswapBridge.sol
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| Original file line number | Diff line number | Diff line change |
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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; | ||
|
|
||
| import "@0x/contracts-erc20/contracts/src/interfaces/IERC20Token.sol"; | ||
| import "@0x/contracts-erc20/contracts/src/interfaces/IEtherToken.sol"; | ||
| import "@0x/contracts-exchange-libs/contracts/src/IWallet.sol"; | ||
| import "../interfaces/IUniswapExchangeFactory.sol"; | ||
| import "../interfaces/IUniswapExchange.sol"; | ||
| import "../interfaces/IERC20Bridge.sol"; | ||
|
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| // solhint-disable space-after-comma | ||
| // solhint-disable not-rely-on-time | ||
| contract UniswapBridge is | ||
| IERC20Bridge, | ||
| IWallet | ||
| { | ||
| /* Mainnet addresses */ | ||
| address constant private UNISWAP_EXCHANGE_FACTORY_ADDRESS = 0xc0a47dFe034B400B47bDaD5FecDa2621de6c4d95; | ||
| address constant private WETH_ADDRESS = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2; | ||
|
|
||
| // Struct to hold `withdrawTo()` local variables in memory and to avoid | ||
| // stack overflows. | ||
| struct WithdrawToState { | ||
| IUniswapExchange exchange; | ||
| uint256 fromTokenBalance; | ||
| IEtherToken weth; | ||
| } | ||
|
|
||
| // solhint-disable no-empty-blocks | ||
| /// @dev Payable fallback to receive ETH from uniswap. | ||
| function () | ||
| external | ||
| payable | ||
| {} | ||
|
|
||
| /// @dev Callback for `IERC20Bridge`. Tries to buy `amount` of | ||
| /// `toTokenAddress` tokens by selling the entirety of the `fromTokenAddress` | ||
| /// token encoded in the bridge data. | ||
| /// @param toTokenAddress The token to buy and transfer to `to`. | ||
| /// @param to The recipient of the bought tokens. | ||
| /// @param amount Minimum amount of `toTokenAddress` tokens to buy. | ||
| /// @param bridgeData The abi-encoded "from" token address. | ||
| /// @return success The magic bytes if successful. | ||
| function withdrawTo( | ||
| address toTokenAddress, | ||
| address /* from */, | ||
| address to, | ||
| uint256 amount, | ||
| bytes calldata bridgeData | ||
| ) | ||
| external | ||
| returns (bytes4 success) | ||
| { | ||
| // State memory object to avoid stack overflows. | ||
| WithdrawToState memory state; | ||
| // Decode the bridge data to get the `fromTokenAddress`. | ||
| (address fromTokenAddress) = abi.decode(bridgeData, (address)); | ||
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| // Just transfer the tokens if they're the same. | ||
| if (fromTokenAddress == toTokenAddress) { | ||
| IERC20Token(fromTokenAddress).transfer(to, amount); | ||
| return BRIDGE_SUCCESS; | ||
| } | ||
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| // Get the exchange for the token pair. | ||
| state.exchange = _getUniswapExchangeForTokenPair( | ||
| fromTokenAddress, | ||
| toTokenAddress | ||
| ); | ||
| // Get our balance of `fromTokenAddress` token. | ||
| state.fromTokenBalance = IERC20Token(fromTokenAddress).balanceOf(address(this)); | ||
| // Get the weth contract. | ||
| state.weth = getWethContract(); | ||
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| // Convert from WETH to a token. | ||
| if (fromTokenAddress == address(state.weth)) { | ||
| // Unwrap the WETH. | ||
| state.weth.withdraw(state.fromTokenBalance); | ||
| // Buy as much of `toTokenAddress` token with ETH as possible and | ||
| // transfer it to `to`. | ||
| state.exchange.ethToTokenTransferInput.value(state.fromTokenBalance)( | ||
| // Minimum buy amount. | ||
| amount, | ||
| // Expires after this block. | ||
| block.timestamp, | ||
| // Recipient is `to`. | ||
| to | ||
| ); | ||
|
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| // Convert from a token to WETH. | ||
| } else if (toTokenAddress == address(state.weth)) { | ||
| // Grant the exchange an allowance. | ||
| _grantExchangeAllowance(state.exchange, fromTokenAddress); | ||
| // Buy as much ETH with `fromTokenAddress` token as possible. | ||
| uint256 ethBought = state.exchange.tokenToEthSwapInput( | ||
| // Sell all tokens we hold. | ||
| state.fromTokenBalance, | ||
| // Minimum buy amount. | ||
| amount, | ||
| // Expires after this block. | ||
| block.timestamp | ||
| ); | ||
| // Wrap the ETH. | ||
| state.weth.deposit.value(ethBought)(); | ||
| // Transfer the WETH to `to`. | ||
| IEtherToken(toTokenAddress).transfer(to, ethBought); | ||
|
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| // Convert from one token to another. | ||
| } else { | ||
| // Grant the exchange an allowance. | ||
| _grantExchangeAllowance(state.exchange, fromTokenAddress); | ||
| // Buy as much `toTokenAddress` token with `fromTokenAddress` token | ||
| // and transfer it to `to`. | ||
| state.exchange.tokenToTokenTransferInput( | ||
| // Sell all tokens we hold. | ||
| state.fromTokenBalance, | ||
| // Minimum buy amount. | ||
| amount, | ||
| // No minimum intermediate ETH buy amount. | ||
| 0, | ||
| // Expires after this block. | ||
| block.timestamp, | ||
| // Recipient is `to`. | ||
| to, | ||
| // Convert to `toTokenAddress`. | ||
| toTokenAddress | ||
| ); | ||
| } | ||
| return BRIDGE_SUCCESS; | ||
| } | ||
|
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||
| /// @dev `SignatureType.Wallet` callback, so that this bridge can be the maker | ||
| /// and sign for itself in orders. Always succeeds. | ||
| /// @return magicValue Success bytes, always. | ||
| function isValidSignature( | ||
| bytes32, | ||
| bytes calldata | ||
| ) | ||
| external | ||
| view | ||
| returns (bytes4 magicValue) | ||
| { | ||
| return LEGACY_WALLET_MAGIC_VALUE; | ||
| } | ||
|
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| /// @dev Overridable way to get the weth contract. | ||
| /// @return token The WETH contract. | ||
| function getWethContract() | ||
| public | ||
| view | ||
| returns (IEtherToken token) | ||
| { | ||
| return IEtherToken(WETH_ADDRESS); | ||
| } | ||
|
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| /// @dev Overridable way to get the uniswap exchange factory contract. | ||
| /// @return factory The exchange factory contract. | ||
| function getUniswapExchangeFactoryContract() | ||
| public | ||
| view | ||
| returns (IUniswapExchangeFactory factory) | ||
| { | ||
| return IUniswapExchangeFactory(UNISWAP_EXCHANGE_FACTORY_ADDRESS); | ||
| } | ||
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| /// @dev Grants an unlimited allowance to the exchange for its token | ||
| /// on behalf of this contract. | ||
| /// @param exchange The Uniswap token exchange. | ||
| /// @param tokenAddress The token address for the exchange. | ||
| function _grantExchangeAllowance(IUniswapExchange exchange, address tokenAddress) | ||
| private | ||
| { | ||
| IERC20Token(tokenAddress).approve(address(exchange), uint256(-1)); | ||
| } | ||
|
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| /// @dev Retrieves the uniswap exchange for a given token pair. | ||
| /// In the case of a WETH-token exchange, this will be the non-WETH token. | ||
| /// In th ecase of a token-token exchange, this will be the first token. | ||
| /// @param fromTokenAddress The address of the token we are converting from. | ||
| /// @param toTokenAddress The address of the token we are converting to. | ||
| /// @return exchange The uniswap exchange. | ||
| function _getUniswapExchangeForTokenPair( | ||
| address fromTokenAddress, | ||
| address toTokenAddress | ||
| ) | ||
| private | ||
| view | ||
| returns (IUniswapExchange exchange) | ||
| { | ||
| address exchangeTokenAddress = fromTokenAddress; | ||
| // Whichever isn't WETH is the exchange token. | ||
| if (fromTokenAddress == address(getWethContract())) { | ||
| exchangeTokenAddress = toTokenAddress; | ||
| } | ||
| exchange = getUniswapExchangeFactoryContract().getExchange(exchangeTokenAddress); | ||
| require(address(exchange) != address(0), "NO_UNISWAP_EXCHANGE_FOR_TOKEN"); | ||
| return exchange; | ||
| } | ||
| } |
77 changes: 77 additions & 0 deletions
77
contracts/asset-proxy/contracts/src/interfaces/IUniswapExchange.sol
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,77 @@ | ||
| /* | ||
| 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. | ||
| */ | ||
|
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| pragma solidity ^0.5.9; | ||
|
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| interface IUniswapExchange { | ||
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| /// @dev Buys at least `minTokensBought` tokens with ETH and transfer them | ||
| /// to `recipient`. | ||
| /// @param minTokensBought The minimum number of tokens to buy. | ||
| /// @param deadline Time when this order expires. | ||
| /// @param recipient Who to transfer the tokens to. | ||
| /// @return tokensBought Amount of tokens bought. | ||
| function ethToTokenTransferInput( | ||
| uint256 minTokensBought, | ||
| uint256 deadline, | ||
| address recipient | ||
| ) | ||
| external | ||
| payable | ||
| returns (uint256 tokensBought); | ||
|
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| /// @dev Buys at least `minEthBought` ETH with tokens. | ||
| /// @param tokensSold Amount of tokens to sell. | ||
| /// @param minEthBought The minimum amount of ETH to buy. | ||
| /// @param deadline Time when this order expires. | ||
| /// @return ethBought Amount of tokens bought. | ||
| function tokenToEthSwapInput( | ||
| uint256 tokensSold, | ||
| uint256 minEthBought, | ||
| uint256 deadline | ||
| ) | ||
| external | ||
| returns (uint256 ethBought); | ||
|
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| /// @dev Buys at least `minTokensBought` tokens with the exchange token | ||
| /// and transfer them to `recipient`. | ||
| /// @param minTokensBought The minimum number of tokens to buy. | ||
| /// @param minEthBought The minimum amount of intermediate ETH to buy. | ||
| /// @param deadline Time when this order expires. | ||
| /// @param recipient Who to transfer the tokens to. | ||
| /// @param toTokenAddress The token being bought. | ||
| /// @return tokensBought Amount of tokens bought. | ||
| function tokenToTokenTransferInput( | ||
| uint256 tokensSold, | ||
| uint256 minTokensBought, | ||
| uint256 minEthBought, | ||
| uint256 deadline, | ||
| address recipient, | ||
| address toTokenAddress | ||
| ) | ||
| external | ||
| returns (uint256 tokensBought); | ||
|
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| /// @dev Retrieves the token that is associated with this exchange. | ||
| /// @return tokenAddress The token address. | ||
| function toTokenAddress() | ||
| external | ||
| view | ||
| returns (address tokenAddress); | ||
| } |
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