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Contract Name:
PolygonTokenBridger
Compiler Version
v0.8.13+commit.abaa5c0e
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: AGPL-3.0-only pragma solidity ^0.8.0; import "./Lockable.sol"; import "./interfaces/WETH9.sol"; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol"; // Polygon Registry contract that stores their addresses. interface PolygonRegistry { function erc20Predicate() external returns (address); } // Polygon ERC20Predicate contract that handles Plasma exits (only used for Matic). interface PolygonERC20Predicate { function startExitWithBurntTokens(bytes calldata data) external; } // ERC20s (on polygon) compatible with polygon's bridge have a withdraw method. interface PolygonIERC20 is IERC20 { function withdraw(uint256 amount) external; } interface MaticToken { function withdraw(uint256 amount) external payable; } /** * @notice Contract deployed on Ethereum and Polygon to facilitate token transfers from Polygon to the HubPool and back. * @dev Because Polygon only allows withdrawals from a particular address to go to that same address on mainnet, we need to * have some sort of contract that can guarantee identical addresses on Polygon and Ethereum. This contract is intended * to be completely immutable, so it's guaranteed that the contract on each side is configured identically as long as * it is created via create2. create2 is an alternative creation method that uses a different address determination * mechanism from normal create. * Normal create: address = hash(deployer_address, deployer_nonce) * create2: address = hash(0xFF, sender, salt, bytecode) * This ultimately allows create2 to generate deterministic addresses that don't depend on the transaction count of the * sender. */ contract PolygonTokenBridger is Lockable { using SafeERC20 for PolygonIERC20; using SafeERC20 for IERC20; // Gas token for Polygon. MaticToken public constant maticToken = MaticToken(0x0000000000000000000000000000000000001010); // Should be set to HubPool on Ethereum, or unused on Polygon. address public immutable destination; // Registry that stores L1 polygon addresses. PolygonRegistry public immutable l1PolygonRegistry; // WETH contract on Ethereum. WETH9 public immutable l1Weth; // Wrapped Matic on Polygon address public immutable l2WrappedMatic; // Chain id for the L1 that this contract is deployed on or communicates with. // For example: if this contract were meant to facilitate transfers from polygon to mainnet, this value would be // the mainnet chainId 1. uint256 public immutable l1ChainId; // Chain id for the L2 that this contract is deployed on or communicates with. // For example: if this contract were meant to facilitate transfers from polygon to mainnet, this value would be // the polygon chainId 137. uint256 public immutable l2ChainId; modifier onlyChainId(uint256 chainId) { _requireChainId(chainId); _; } /** * @notice Constructs Token Bridger contract. * @param _destination Where to send tokens to for this network. * @param _l1PolygonRegistry L1 registry that stores updated addresses of polygon contracts. This should always be * set to the L1 registry regardless if whether it's deployed on L2 or L1. * @param _l1Weth L1 WETH address. * @param _l2WrappedMatic L2 address of wrapped matic token. * @param _l1ChainId the chain id for the L1 in this environment. * @param _l2ChainId the chain id for the L2 in this environment. */ constructor( address _destination, PolygonRegistry _l1PolygonRegistry, WETH9 _l1Weth, address _l2WrappedMatic, uint256 _l1ChainId, uint256 _l2ChainId ) { destination = _destination; l1PolygonRegistry = _l1PolygonRegistry; l1Weth = _l1Weth; l2WrappedMatic = _l2WrappedMatic; l1ChainId = _l1ChainId; l2ChainId = _l2ChainId; } /** * @notice Called by Polygon SpokePool to send tokens over bridge to contract with the same address as this. * @notice The caller of this function must approve this contract to spend amount of token. * @param token Token to bridge. * @param amount Amount to bridge. */ function send(PolygonIERC20 token, uint256 amount) public nonReentrant onlyChainId(l2ChainId) { token.safeTransferFrom(msg.sender, address(this), amount); // In the wMatic case, this unwraps. For other ERC20s, this is the burn/send action. token.withdraw(token.balanceOf(address(this))); // This takes the token that was withdrawn and calls withdraw on the "native" ERC20. if (address(token) == l2WrappedMatic) maticToken.withdraw{ value: address(this).balance }(address(this).balance); } /** * @notice Called by someone to send tokens to the destination, which should be set to the HubPool. * @param token Token to send to destination. */ function retrieve(IERC20 token) public nonReentrant onlyChainId(l1ChainId) { if (address(token) == address(l1Weth)) { // For WETH, there is a pre-deposit step to ensure any ETH that has been sent to the contract is captured. l1Weth.deposit{ value: address(this).balance }(); } token.safeTransfer(destination, token.balanceOf(address(this))); } /** * @notice Called to initiate an l1 exit (withdrawal) of matic tokens that have been sent over the plasma bridge. * @param data the proof data to trigger the exit. Can be generated using the maticjs-plasma package. */ function callExit(bytes memory data) public nonReentrant onlyChainId(l1ChainId) { PolygonERC20Predicate erc20Predicate = PolygonERC20Predicate(l1PolygonRegistry.erc20Predicate()); erc20Predicate.startExitWithBurntTokens(data); } receive() external payable { // This method is empty to avoid any gas expendatures that might cause transfers to fail. // Note: the fact that there is _no_ code in this function means that matic can be erroneously transferred in // to the contract on the polygon side. These tokens would be locked indefinitely since the receive function // cannot be called on the polygon side. While this does have some downsides, the lack of any functionality // in this function means that it has no chance of running out of gas on transfers, which is a much more // important benefit. This just makes the matic token risk similar to that of ERC20s that are erroneously // sent to the contract. } function _requireChainId(uint256 chainId) internal view { require(block.chainid == chainId, "Cannot run method on this chain"); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/IERC20.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by `account`. */ function balanceOf(address account) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `to`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address to, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: Beware that changing an allowance with this method brings the risk * that someone may use both the old and the new allowance by unfortunate * transaction ordering. One possible solution to mitigate this race * condition is to first reduce the spender's allowance to 0 and set the * desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `from` to `to` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom( address from, address to, uint256 amount ) external returns (bool); /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol) pragma solidity ^0.8.0; import "../IERC20.sol"; import "../../../utils/Address.sol"; /** * @title SafeERC20 * @dev Wrappers around ERC20 operations that throw on failure (when the token * contract returns false). Tokens that return no value (and instead revert or * throw on failure) are also supported, non-reverting calls are assumed to be * successful. * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract, * which allows you to call the safe operations as `token.safeTransfer(...)`, etc. */ library SafeERC20 { using Address for address; function safeTransfer( IERC20 token, address to, uint256 value ) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value)); } function safeTransferFrom( IERC20 token, address from, address to, uint256 value ) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value)); } /** * @dev Deprecated. This function has issues similar to the ones found in * {IERC20-approve}, and its usage is discouraged. * * Whenever possible, use {safeIncreaseAllowance} and * {safeDecreaseAllowance} instead. */ function safeApprove( IERC20 token, address spender, uint256 value ) internal { // safeApprove should only be called when setting an initial allowance, // or when resetting it to zero. To increase and decrease it, use // 'safeIncreaseAllowance' and 'safeDecreaseAllowance' require( (value == 0) || (token.allowance(address(this), spender) == 0), "SafeERC20: approve from non-zero to non-zero allowance" ); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value)); } function safeIncreaseAllowance( IERC20 token, address spender, uint256 value ) internal { uint256 newAllowance = token.allowance(address(this), spender) + value; _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } function safeDecreaseAllowance( IERC20 token, address spender, uint256 value ) internal { unchecked { uint256 oldAllowance = token.allowance(address(this), spender); require(oldAllowance >= value, "SafeERC20: decreased allowance below zero"); uint256 newAllowance = oldAllowance - value; _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } } /** * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement * on the return value: the return value is optional (but if data is returned, it must not be false). * @param token The token targeted by the call. * @param data The call data (encoded using abi.encode or one of its variants). */ function _callOptionalReturn(IERC20 token, bytes memory data) private { // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that // the target address contains contract code and also asserts for success in the low-level call. bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed"); if (returndata.length > 0) { // Return data is optional require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed"); } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol) pragma solidity ^0.8.1; /** * @dev Collection of functions related to the address type */ library Address { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * ==== * * [IMPORTANT] * ==== * You shouldn't rely on `isContract` to protect against flash loan attacks! * * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract * constructor. * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize/address.code.length, which returns 0 // for contracts in construction, since the code is only stored at the end // of the constructor execution. return account.code.length > 0; } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); (bool success, ) = recipient.call{value: amount}(""); require(success, "Address: unable to send value, recipient may have reverted"); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain `call` is an unsafe replacement for a function call: use this * function instead. * * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * * Requirements: * * - `target` must be a contract. * - calling `target` with `data` must not revert. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data) internal returns (bytes memory) { return functionCall(target, data, "Address: low-level call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with * `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but also transferring `value` wei to `target`. * * Requirements: * * - the calling contract must have an ETH balance of at least `value`. * - the called Solidity function must be `payable`. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value ) internal returns (bytes memory) { return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); } /** * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but * with `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value, string memory errorMessage ) internal returns (bytes memory) { require(address(this).balance >= value, "Address: insufficient balance for call"); require(isContract(target), "Address: call to non-contract"); (bool success, bytes memory returndata) = target.call{value: value}(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) { return functionStaticCall(target, data, "Address: low-level static call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall( address target, bytes memory data, string memory errorMessage ) internal view returns (bytes memory) { require(isContract(target), "Address: static call to non-contract"); (bool success, bytes memory returndata) = target.staticcall(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) { return functionDelegateCall(target, data, "Address: low-level delegate call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { require(isContract(target), "Address: delegate call to non-contract"); (bool success, bytes memory returndata) = target.delegatecall(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the * revert reason using the provided one. * * _Available since v4.3._ */ function verifyCallResult( bool success, bytes memory returndata, string memory errorMessage ) internal pure returns (bytes memory) { if (success) { return returndata; } else { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
// SPDX-License-Identifier: AGPL-3.0-only pragma solidity ^0.8.0; /** * @title A contract that provides modifiers to prevent reentrancy to state-changing and view-only methods. This contract * is inspired by https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/ReentrancyGuard.sol * and https://github.com/balancer-labs/balancer-core/blob/master/contracts/BPool.sol. * @dev The reason why we use this local contract instead of importing from uma/contracts is because of the addition * of the internal method `functionCallStackOriginatesFromOutsideThisContract` which doesn't exist in the one exported * by uma/contracts. */ contract Lockable { bool internal _notEntered; constructor() { // Storing an initial non-zero value makes deployment a bit more expensive, but in exchange the refund on every // call to nonReentrant will be lower in amount. Since refunds are capped to a percentage of the total // transaction's gas, it is best to keep them low in cases like this one, to increase the likelihood of the full // refund coming into effect. _notEntered = true; } /** * @dev Prevents a contract from calling itself, directly or indirectly. * Calling a nonReentrant function from another nonReentrant function is not supported. It is possible to * prevent this from happening by making the nonReentrant function external, and making it call a private * function that does the actual state modification. */ modifier nonReentrant() { _preEntranceCheck(); _preEntranceSet(); _; _postEntranceReset(); } /** * @dev Designed to prevent a view-only method from being re-entered during a call to a nonReentrant() state-changing method. */ modifier nonReentrantView() { _preEntranceCheck(); _; } /** * @dev Returns true if the contract is currently in a non-entered state, meaning that the origination of the call * came from outside the contract. This is relevant with fallback/receive methods to see if the call came from ETH * being dropped onto the contract externally or due to ETH dropped on the the contract from within a method in this * contract, such as unwrapping WETH to ETH within the contract. */ function functionCallStackOriginatesFromOutsideThisContract() internal view returns (bool) { return _notEntered; } // Internal methods are used to avoid copying the require statement's bytecode to every nonReentrant() method. // On entry into a function, _preEntranceCheck() should always be called to check if the function is being // re-entered. Then, if the function modifies state, it should call _postEntranceSet(), perform its logic, and // then call _postEntranceReset(). // View-only methods can simply call _preEntranceCheck() to make sure that it is not being re-entered. function _preEntranceCheck() internal view { // On the first call to nonReentrant, _notEntered will be true require(_notEntered, "ReentrancyGuard: reentrant call"); } function _preEntranceSet() internal { // Any calls to nonReentrant after this point will fail _notEntered = false; } function _postEntranceReset() internal { // By storing the original value once again, a refund is triggered (see // https://eips.ethereum.org/EIPS/eip-2200) _notEntered = true; } }
// SPDX-License-Identifier: GPL-3.0-only pragma solidity ^0.8.0; interface WETH9 { function withdraw(uint256 wad) external; function deposit() external payable; function balanceOf(address guy) external view returns (uint256 wad); function transfer(address guy, uint256 wad) external; }
{ "evmVersion": "london", "libraries": {}, "metadata": { "bytecodeHash": "ipfs", "useLiteralContent": true }, "optimizer": { "enabled": true, "runs": 1000000 }, "remappings": [], "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } } }
Contract Security Audit
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[{"inputs":[{"internalType":"address","name":"_destination","type":"address"},{"internalType":"contract PolygonRegistry","name":"_l1PolygonRegistry","type":"address"},{"internalType":"contract WETH9","name":"_l1Weth","type":"address"},{"internalType":"address","name":"_l2WrappedMatic","type":"address"},{"internalType":"uint256","name":"_l1ChainId","type":"uint256"},{"internalType":"uint256","name":"_l2ChainId","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[{"internalType":"bytes","name":"data","type":"bytes"}],"name":"callExit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"destination","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"l1ChainId","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"l1PolygonRegistry","outputs":[{"internalType":"contract PolygonRegistry","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"l1Weth","outputs":[{"internalType":"contract WETH9","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"l2ChainId","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"l2WrappedMatic","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"maticToken","outputs":[{"internalType":"contract MaticToken","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract IERC20","name":"token","type":"address"}],"name":"retrieve","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract PolygonIERC20","name":"token","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"send","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]
Contract Creation Code
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Deployed Bytecode
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
000000000000000000000000c186fa914353c44b2e33ebe05f21846f1048beda00000000000000000000000033a02e6cc863d393d6bf231b697b82f6e499ca71000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc20000000000000000000000000d500b1d8e8ef31e21c99d1db9a6444d3adf127000000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000089
-----Decoded View---------------
Arg [0] : _destination (address): 0xc186fA914353c44b2E33eBE05f21846F1048bEda
Arg [1] : _l1PolygonRegistry (address): 0x33a02E6cC863D393d6Bf231B697b82F6e499cA71
Arg [2] : _l1Weth (address): 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2
Arg [3] : _l2WrappedMatic (address): 0x0d500B1d8E8eF31E21C99d1Db9A6444d3ADf1270
Arg [4] : _l1ChainId (uint256): 1
Arg [5] : _l2ChainId (uint256): 137
-----Encoded View---------------
6 Constructor Arguments found :
Arg [0] : 000000000000000000000000c186fa914353c44b2e33ebe05f21846f1048beda
Arg [1] : 00000000000000000000000033a02e6cc863d393d6bf231b697b82f6e499ca71
Arg [2] : 000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2
Arg [3] : 0000000000000000000000000d500b1d8e8ef31e21c99d1db9a6444d3adf1270
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000001
Arg [5] : 0000000000000000000000000000000000000000000000000000000000000089
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Multichain Portfolio | 26 Chains
Chain | Token | Portfolio % | Price | Amount | Value |
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.