Warning! Contract bytecode has been changed and doesn't match the verified one. Therefore, interaction with this smart contract may be risky.
- Contract name:
- L2ERC20Gateway
- Optimization enabled
- true
- Compiler version
- v0.6.11+commit.5ef660b1
- Optimization runs
- 100
- Verified at
- 2023-08-24T12:54:51.254000Z
contracts/tokenbridge/arbitrum/gateway/L2ERC20Gateway.sol
// SPDX-License-Identifier: Apache-2.0
/*
* Copyright 2020, Offchain Labs, Inc.
*
* 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 ^0.6.11;
import "@openzeppelin/contracts/proxy/UpgradeableBeacon.sol";
import "@openzeppelin/contracts/utils/Create2.sol";
import "./L2ArbitrumGateway.sol";
import "../StandardArbERC20.sol";
import "../../libraries/ClonableBeaconProxy.sol";
contract L2ERC20Gateway is L2ArbitrumGateway {
address public beaconProxyFactory;
function initialize(
address _l1Counterpart,
address _router,
address _beaconProxyFactory
) public {
L2ArbitrumGateway._initialize(_l1Counterpart, _router);
require(_beaconProxyFactory != address(0), "INVALID_BEACON");
beaconProxyFactory = _beaconProxyFactory;
}
/**
* @notice Calculate the address used when bridging an ERC20 token
* @dev the L1 and L2 address oracles may not always be in sync.
* For example, a custom token may have been registered but not deploy or the contract self destructed.
* @param l1ERC20 address of L1 token
* @return L2 address of a bridged ERC20 token
*/
function calculateL2TokenAddress(address l1ERC20)
public
view
virtual
override
returns (address)
{
// this method is marked virtual to be overriden in subclasses used in testing
return
BeaconProxyFactory(beaconProxyFactory).calculateExpectedAddress(
address(this),
getUserSalt(l1ERC20)
);
}
function cloneableProxyHash() public view returns (bytes32) {
return BeaconProxyFactory(beaconProxyFactory).cloneableProxyHash();
}
function getUserSalt(address l1ERC20) public pure returns (bytes32) {
return keccak256(abi.encode(l1ERC20));
}
/**
* @notice internal utility function used to deploy ERC20 tokens with the beacon proxy pattern.
* @dev the transparent proxy implementation by OpenZeppelin can't be used if we want to be able to
* upgrade the token logic.
* @param l1ERC20 L1 address of ERC20
* @param expectedL2Address L2 address of ERC20
* @param deployData encoded symbol/name/decimal data for initial deploy
*/
function handleNoContract(
address l1ERC20,
address expectedL2Address,
address _from,
address, /* _to */
uint256 _amount,
bytes memory deployData
) internal override returns (bool shouldHalt) {
bytes32 userSalt = getUserSalt(l1ERC20);
address createdContract = BeaconProxyFactory(beaconProxyFactory).createProxy(userSalt);
StandardArbERC20(createdContract).bridgeInit(l1ERC20, deployData);
if (createdContract == expectedL2Address) {
return false;
} else {
// trigger withdrawal then halt
// this codepath should only be hit if the system is setup incorrectly
// this withdrawal is for error recovery, not composing with L2 dapps, so we ignore the return value
triggerWithdrawal(l1ERC20, address(this), _from, _amount, "");
return true;
}
}
}
@openzeppelin/contracts-upgradeable/utils/CountersUpgradeable.sol
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
import "../math/SafeMathUpgradeable.sol";
/**
* @title Counters
* @author Matt Condon (@shrugs)
* @dev Provides counters that can only be incremented or decremented by one. This can be used e.g. to track the number
* of elements in a mapping, issuing ERC721 ids, or counting request ids.
*
* Include with `using Counters for Counters.Counter;`
* Since it is not possible to overflow a 256 bit integer with increments of one, `increment` can skip the {SafeMath}
* overflow check, thereby saving gas. This does assume however correct usage, in that the underlying `_value` is never
* directly accessed.
*/
library CountersUpgradeable {
using SafeMathUpgradeable for uint256;
struct Counter {
// This variable should never be directly accessed by users of the library: interactions must be restricted to
// the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
// this feature: see https://github.com/ethereum/solidity/issues/4637
uint256 _value; // default: 0
}
function current(Counter storage counter) internal view returns (uint256) {
return counter._value;
}
function increment(Counter storage counter) internal {
// The {SafeMath} overflow check can be skipped here, see the comment at the top
counter._value += 1;
}
function decrement(Counter storage counter) internal {
counter._value = counter._value.sub(1);
}
}
Contract ABI
[{"type":"event","name":"DepositFinalized","inputs":[{"type":"address","name":"l1Token","internalType":"address","indexed":true},{"type":"address","name":"_from","internalType":"address","indexed":true},{"type":"address","name":"_to","internalType":"address","indexed":true},{"type":"uint256","name":"_amount","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"TxToL1","inputs":[{"type":"address","name":"_from","internalType":"address","indexed":true},{"type":"address","name":"_to","internalType":"address","indexed":true},{"type":"uint256","name":"_id","internalType":"uint256","indexed":true},{"type":"bytes","name":"_data","internalType":"bytes","indexed":false}],"anonymous":false},{"type":"event","name":"WithdrawalInitiated","inputs":[{"type":"address","name":"l1Token","internalType":"address","indexed":false},{"type":"address","name":"_from","internalType":"address","indexed":true},{"type":"address","name":"_to","internalType":"address","indexed":true},{"type":"uint256","name":"_l2ToL1Id","internalType":"uint256","indexed":true},{"type":"uint256","name":"_exitNum","internalType":"uint256","indexed":false},{"type":"uint256","name":"_amount","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"beaconProxyFactory","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"calculateL2TokenAddress","inputs":[{"type":"address","name":"l1ERC20","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"bytes32","name":"","internalType":"bytes32"}],"name":"cloneableProxyHash","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"counterpartGateway","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"exitNum","inputs":[]},{"type":"function","stateMutability":"payable","outputs":[],"name":"finalizeInboundTransfer","inputs":[{"type":"address","name":"_token","internalType":"address"},{"type":"address","name":"_from","internalType":"address"},{"type":"address","name":"_to","internalType":"address"},{"type":"uint256","name":"_amount","internalType":"uint256"},{"type":"bytes","name":"_data","internalType":"bytes"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"bytes","name":"outboundCalldata","internalType":"bytes"}],"name":"getOutboundCalldata","inputs":[{"type":"address","name":"_token","internalType":"address"},{"type":"address","name":"_from","internalType":"address"},{"type":"address","name":"_to","internalType":"address"},{"type":"uint256","name":"_amount","internalType":"uint256"},{"type":"bytes","name":"_data","internalType":"bytes"}]},{"type":"function","stateMutability":"pure","outputs":[{"type":"bytes32","name":"","internalType":"bytes32"}],"name":"getUserSalt","inputs":[{"type":"address","name":"l1ERC20","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"initialize","inputs":[{"type":"address","name":"_l1Counterpart","internalType":"address"},{"type":"address","name":"_router","internalType":"address"},{"type":"address","name":"_beaconProxyFactory","internalType":"address"}]},{"type":"function","stateMutability":"payable","outputs":[{"type":"bytes","name":"","internalType":"bytes"}],"name":"outboundTransfer","inputs":[{"type":"address","name":"_l1Token","internalType":"address"},{"type":"address","name":"_to","internalType":"address"},{"type":"uint256","name":"_amount","internalType":"uint256"},{"type":"bytes","name":"_data","internalType":"bytes"}]},{"type":"function","stateMutability":"payable","outputs":[{"type":"bytes","name":"res","internalType":"bytes"}],"name":"outboundTransfer","inputs":[{"type":"address","name":"_l1Token","internalType":"address"},{"type":"address","name":"_to","internalType":"address"},{"type":"uint256","name":"_amount","internalType":"uint256"},{"type":"uint256","name":"","internalType":"uint256"},{"type":"uint256","name":"","internalType":"uint256"},{"type":"bytes","name":"_data","internalType":"bytes"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"postUpgradeInit","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"router","inputs":[]}]
Contract Creation Code
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