Added cream bridge contract
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Alex Kroeger
parent
66e2d93e9c
commit
00f55be83e
103
contracts/asset-proxy/contracts/src/bridges/CreamBridge.sol
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103
contracts/asset-proxy/contracts/src/bridges/CreamBridge.sol
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/*
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Copyright 2020 ZeroEx Intl.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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pragma solidity ^0.5.9;
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pragma experimental ABIEncoderV2;
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import "@0x/contracts-erc20/contracts/src/interfaces/IERC20Token.sol";
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import "@0x/contracts-erc20/contracts/src/LibERC20Token.sol";
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import "@0x/contracts-exchange-libs/contracts/src/IWallet.sol";
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import "@0x/contracts-utils/contracts/src/DeploymentConstants.sol";
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import "../interfaces/IERC20Bridge.sol";
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import "../interfaces/IBalancerPool.sol";
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contract CreamBridge is
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IERC20Bridge,
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IWallet,
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DeploymentConstants
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{
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/// @dev Callback for `IERC20Bridge`. Tries to buy `amount` of
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/// `toTokenAddress` tokens by selling the entirety of the `fromTokenAddress`
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/// token encoded in the bridge data, then transfers the bought
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/// tokens to `to`.
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/// @param toTokenAddress The token to buy and transfer to `to`.
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/// @param from The maker (this contract).
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/// @param to The recipient of the bought tokens.
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/// @param amount Minimum amount of `toTokenAddress` tokens to buy.
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/// @param bridgeData The abi-encoded addresses of the "from" token and Balancer pool.
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/// @return success The magic bytes if successful.
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function bridgeTransferFrom(
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address toTokenAddress,
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address from,
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address to,
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uint256 amount,
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bytes calldata bridgeData
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)
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external
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returns (bytes4 success)
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{
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// Decode the bridge data.
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(address fromTokenAddress, address poolAddress) = abi.decode(
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bridgeData,
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(address, address)
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);
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require(toTokenAddress != fromTokenAddress, "CreamBridge/INVALID_PAIR");
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uint256 fromTokenBalance = IERC20Token(fromTokenAddress).balanceOf(address(this));
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// Grant an allowance to the exchange to spend `fromTokenAddress` token.
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LibERC20Token.approveIfBelow(fromTokenAddress, poolAddress, fromTokenBalance);
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// Sell all of this contract's `fromTokenAddress` token balance.
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(uint256 boughtAmount,) = IBalancerPool(poolAddress).swapExactAmountIn(
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fromTokenAddress, // tokenIn
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fromTokenBalance, // tokenAmountIn
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toTokenAddress, // tokenOut
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amount, // minAmountOut
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uint256(-1) // maxPrice
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);
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// Transfer the converted `toToken`s to `to`.
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LibERC20Token.transfer(toTokenAddress, to, boughtAmount);
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emit ERC20BridgeTransfer(
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fromTokenAddress,
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toTokenAddress,
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fromTokenBalance,
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boughtAmount,
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from,
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to
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);
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return BRIDGE_SUCCESS;
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}
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/// @dev `SignatureType.Wallet` callback, so that this bridge can be the maker
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/// and sign for itself in orders. Always succeeds.
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/// @return magicValue Magic success bytes, always.
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function isValidSignature(
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bytes32,
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bytes calldata
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)
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external
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view
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returns (bytes4 magicValue)
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{
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return LEGACY_WALLET_MAGIC_VALUE;
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}
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}
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@ -38,7 +38,7 @@
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"docs:json": "typedoc --excludePrivate --excludeExternals --excludeProtected --ignoreCompilerErrors --target ES5 --tsconfig typedoc-tsconfig.json --json $JSON_FILE_PATH $PROJECT_FILES"
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},
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"config": {
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"abis": "./test/generated-artifacts/@(BalancerBridge|BancorBridge|ChaiBridge|CurveBridge|DexForwarderBridge|DydxBridge|ERC1155Proxy|ERC20BridgeProxy|ERC20Proxy|ERC721Proxy|Eth2DaiBridge|IAssetData|IAssetProxy|IAssetProxyDispatcher|IAuthorizable|IBalancerPool|IBancorNetwork|IChai|ICurve|IDydx|IDydxBridge|IERC20Bridge|IEth2Dai|IGasToken|IKyberNetworkProxy|IMStable|IMooniswap|IUniswapExchange|IUniswapExchangeFactory|IUniswapV2Router01|KyberBridge|MStableBridge|MixinAssetProxyDispatcher|MixinAuthorizable|MixinGasToken|MooniswapBridge|MultiAssetProxy|Ownable|StaticCallProxy|SushiSwapBridge|TestBancorBridge|TestChaiBridge|TestDexForwarderBridge|TestDydxBridge|TestERC20Bridge|TestEth2DaiBridge|TestKyberBridge|TestStaticCallTarget|TestUniswapBridge|TestUniswapV2Bridge|UniswapBridge|UniswapV2Bridge).json",
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"abis": "./test/generated-artifacts/@(BalancerBridge|BancorBridge|ChaiBridge|CreamBridge|CurveBridge|DexForwarderBridge|DydxBridge|ERC1155Proxy|ERC20BridgeProxy|ERC20Proxy|ERC721Proxy|Eth2DaiBridge|IAssetData|IAssetProxy|IAssetProxyDispatcher|IAuthorizable|IBalancerPool|IBancorNetwork|IChai|ICurve|IDydx|IDydxBridge|IERC20Bridge|IEth2Dai|IGasToken|IKyberNetworkProxy|IMStable|IMooniswap|IUniswapExchange|IUniswapExchangeFactory|IUniswapV2Router01|KyberBridge|MStableBridge|MixinAssetProxyDispatcher|MixinAuthorizable|MixinGasToken|MooniswapBridge|MultiAssetProxy|Ownable|StaticCallProxy|SushiSwapBridge|TestBancorBridge|TestChaiBridge|TestDexForwarderBridge|TestDydxBridge|TestERC20Bridge|TestEth2DaiBridge|TestKyberBridge|TestStaticCallTarget|TestUniswapBridge|TestUniswapV2Bridge|UniswapBridge|UniswapV2Bridge).json",
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"abis:comment": "This list is auto-generated by contracts-gen. Don't edit manually."
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},
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"repository": {
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@ -8,6 +8,7 @@ import { ContractArtifact } from 'ethereum-types';
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import * as BalancerBridge from '../generated-artifacts/BalancerBridge.json';
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import * as BancorBridge from '../generated-artifacts/BancorBridge.json';
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import * as ChaiBridge from '../generated-artifacts/ChaiBridge.json';
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import * as CreamBridge from '../generated-artifacts/CreamBridge.json';
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import * as CurveBridge from '../generated-artifacts/CurveBridge.json';
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import * as DexForwarderBridge from '../generated-artifacts/DexForwarderBridge.json';
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import * as DydxBridge from '../generated-artifacts/DydxBridge.json';
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@ -70,6 +71,7 @@ export const artifacts = {
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BalancerBridge: BalancerBridge as ContractArtifact,
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BancorBridge: BancorBridge as ContractArtifact,
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ChaiBridge: ChaiBridge as ContractArtifact,
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CreamBridge: CreamBridge as ContractArtifact,
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CurveBridge: CurveBridge as ContractArtifact,
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DexForwarderBridge: DexForwarderBridge as ContractArtifact,
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DydxBridge: DydxBridge as ContractArtifact,
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@ -6,6 +6,7 @@
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export * from '../generated-wrappers/balancer_bridge';
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export * from '../generated-wrappers/bancor_bridge';
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export * from '../generated-wrappers/chai_bridge';
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export * from '../generated-wrappers/cream_bridge';
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export * from '../generated-wrappers/curve_bridge';
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export * from '../generated-wrappers/dex_forwarder_bridge';
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export * from '../generated-wrappers/dydx_bridge';
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@ -8,6 +8,7 @@ import { ContractArtifact } from 'ethereum-types';
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import * as BalancerBridge from '../test/generated-artifacts/BalancerBridge.json';
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import * as BancorBridge from '../test/generated-artifacts/BancorBridge.json';
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import * as ChaiBridge from '../test/generated-artifacts/ChaiBridge.json';
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import * as CreamBridge from '../test/generated-artifacts/CreamBridge.json';
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import * as CurveBridge from '../test/generated-artifacts/CurveBridge.json';
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import * as DexForwarderBridge from '../test/generated-artifacts/DexForwarderBridge.json';
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import * as DydxBridge from '../test/generated-artifacts/DydxBridge.json';
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@ -70,6 +71,7 @@ export const artifacts = {
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BalancerBridge: BalancerBridge as ContractArtifact,
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BancorBridge: BancorBridge as ContractArtifact,
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ChaiBridge: ChaiBridge as ContractArtifact,
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CreamBridge: CreamBridge as ContractArtifact,
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CurveBridge: CurveBridge as ContractArtifact,
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DexForwarderBridge: DexForwarderBridge as ContractArtifact,
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DydxBridge: DydxBridge as ContractArtifact,
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@ -6,6 +6,7 @@
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export * from '../test/generated-wrappers/balancer_bridge';
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export * from '../test/generated-wrappers/bancor_bridge';
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export * from '../test/generated-wrappers/chai_bridge';
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export * from '../test/generated-wrappers/cream_bridge';
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export * from '../test/generated-wrappers/curve_bridge';
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export * from '../test/generated-wrappers/dex_forwarder_bridge';
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export * from '../test/generated-wrappers/dydx_bridge';
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@ -6,6 +6,7 @@
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"generated-artifacts/BalancerBridge.json",
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"generated-artifacts/BancorBridge.json",
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"generated-artifacts/ChaiBridge.json",
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"generated-artifacts/CreamBridge.json",
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"generated-artifacts/CurveBridge.json",
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"generated-artifacts/DexForwarderBridge.json",
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"generated-artifacts/DydxBridge.json",
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@ -58,6 +59,7 @@
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"test/generated-artifacts/BalancerBridge.json",
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"test/generated-artifacts/BancorBridge.json",
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"test/generated-artifacts/ChaiBridge.json",
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"test/generated-artifacts/CreamBridge.json",
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"test/generated-artifacts/CurveBridge.json",
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"test/generated-artifacts/DexForwarderBridge.json",
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"test/generated-artifacts/DydxBridge.json",
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