ETH Price: $3,926.43 (+4.13%)
Gas: 7 Gwei

Contract

0x3E94e8d4316a1eBfb2245E45E6F0B8724094CE1A
 

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0x61014060147044502022-05-03 11:43:31754 days ago1651578211IN
 Create: Polygon_Adapter
0 ETH0.0481261256.47187605

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Contract Source Code Verified (Exact Match)

Contract Name:
Polygon_Adapter

Compiler Version
v0.8.13+commit.abaa5c0e

Optimization Enabled:
Yes with 1000000 runs

Other Settings:
default evmVersion, GNU GPLv3 license
File 1 of 6 : Polygon_Adapter.sol
// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity ^0.8.0;

import "../interfaces/AdapterInterface.sol";
import "../interfaces/WETH9.sol";

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

interface IRootChainManager {
    function depositEtherFor(address user) external payable;

    function depositFor(
        address user,
        address rootToken,
        bytes calldata depositData
    ) external;
}

interface IFxStateSender {
    function sendMessageToChild(address _receiver, bytes calldata _data) external;
}

interface DepositManager {
    function depositERC20ForUser(
        address token,
        address user,
        uint256 amount
    ) external;
}

/**
 * @notice Sends cross chain messages Polygon L2 network.
 * @dev Public functions calling external contracts do not guard against reentrancy because they are expected to be
 * called via delegatecall, which will execute this contract's logic within the context of the originating contract.
 * For example, the HubPool will delegatecall these functions, therefore its only necessary that the HubPool's methods
 * that call this contract's logic guard against reentrancy.
 */

// solhint-disable-next-line contract-name-camelcase
contract Polygon_Adapter is AdapterInterface {
    using SafeERC20 for IERC20;
    IRootChainManager public immutable rootChainManager;
    IFxStateSender public immutable fxStateSender;
    DepositManager public immutable depositManager;
    address public immutable erc20Predicate;
    address public immutable l1Matic;
    WETH9 public immutable l1Weth;

    /**
     * @notice Constructs new Adapter.
     * @param _rootChainManager RootChainManager Polygon system contract to deposit tokens over the PoS bridge.
     * @param _fxStateSender FxStateSender Polygon system contract to send arbitrary messages to L2.
     * @param _depositManager DepositManager Polygon system contract to deposit tokens over the Plasma bridge (Matic).
     * @param _erc20Predicate ERC20Predicate Polygon system contract to approve when depositing to the PoS bridge.
     * @param _l1Matic matic address on l1.
     * @param _l1Weth WETH address on L1.
     */
    constructor(
        IRootChainManager _rootChainManager,
        IFxStateSender _fxStateSender,
        DepositManager _depositManager,
        address _erc20Predicate,
        address _l1Matic,
        WETH9 _l1Weth
    ) {
        rootChainManager = _rootChainManager;
        fxStateSender = _fxStateSender;
        depositManager = _depositManager;
        erc20Predicate = _erc20Predicate;
        l1Matic = _l1Matic;
        l1Weth = _l1Weth;
    }

    /**
     * @notice Send cross-chain message to target on Polygon.
     * @param target Contract on Polygon that will receive message.
     * @param message Data to send to target.
     */

    function relayMessage(address target, bytes calldata message) external payable override {
        fxStateSender.sendMessageToChild(target, message);
        emit MessageRelayed(target, message);
    }

    /**
     * @notice Bridge tokens to Polygon.
     * @param l1Token L1 token to deposit.
     * @param l2Token L2 token to receive.
     * @param amount Amount of L1 tokens to deposit and L2 tokens to receive.
     * @param to Bridge recipient.
     */
    function relayTokens(
        address l1Token,
        address l2Token,
        uint256 amount,
        address to
    ) external payable override {
        // If the l1Token is weth then unwrap it to ETH then send the ETH to the standard bridge.
        if (l1Token == address(l1Weth)) {
            l1Weth.withdraw(amount);
            rootChainManager.depositEtherFor{ value: amount }(to);
        } else if (l1Token == l1Matic) {
            IERC20(l1Token).safeIncreaseAllowance(address(depositManager), amount);
            depositManager.depositERC20ForUser(l1Token, to, amount);
        } else {
            IERC20(l1Token).safeIncreaseAllowance(erc20Predicate, amount);
            rootChainManager.depositFor(to, l1Token, abi.encode(amount));
        }
        emit TokensRelayed(l1Token, l2Token, amount, to);
    }
}

File 2 of 6 : IERC20.sol
// 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);
}

File 3 of 6 : SafeERC20.sol
// 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");
        }
    }
}

File 4 of 6 : Address.sol
// 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);
            }
        }
    }
}

File 6 of 6 : AdapterInterface.sol
// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity ^0.8.0;

/**
 * @notice Sends cross chain messages and tokens to contracts on a specific L2 network.
 */

interface AdapterInterface {
    event MessageRelayed(address target, bytes message);

    event TokensRelayed(address l1Token, address l2Token, uint256 amount, address to);

    function relayMessage(address target, bytes calldata message) external payable;

    function relayTokens(
        address l1Token,
        address l2Token,
        uint256 amount,
        address to
    ) external payable;
}

File 7 of 6 : WETH9.sol
// 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;
}

Settings
{
  "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

Contract ABI

[{"inputs":[{"internalType":"contract IRootChainManager","name":"_rootChainManager","type":"address"},{"internalType":"contract IFxStateSender","name":"_fxStateSender","type":"address"},{"internalType":"contract DepositManager","name":"_depositManager","type":"address"},{"internalType":"address","name":"_erc20Predicate","type":"address"},{"internalType":"address","name":"_l1Matic","type":"address"},{"internalType":"contract WETH9","name":"_l1Weth","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"target","type":"address"},{"indexed":false,"internalType":"bytes","name":"message","type":"bytes"}],"name":"MessageRelayed","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"l1Token","type":"address"},{"indexed":false,"internalType":"address","name":"l2Token","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"address","name":"to","type":"address"}],"name":"TokensRelayed","type":"event"},{"inputs":[],"name":"depositManager","outputs":[{"internalType":"contract DepositManager","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"erc20Predicate","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"fxStateSender","outputs":[{"internalType":"contract IFxStateSender","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"l1Matic","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"l1Weth","outputs":[{"internalType":"contract WETH9","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"target","type":"address"},{"internalType":"bytes","name":"message","type":"bytes"}],"name":"relayMessage","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"l1Token","type":"address"},{"internalType":"address","name":"l2Token","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"address","name":"to","type":"address"}],"name":"relayTokens","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"rootChainManager","outputs":[{"internalType":"contract IRootChainManager","name":"","type":"address"}],"stateMutability":"view","type":"function"}]

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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)

000000000000000000000000a0c68c638235ee32657e8f720a23cec1bfc77c77000000000000000000000000fe5e5d361b2ad62c541bab87c45a0b9b018389a2000000000000000000000000401f6c983ea34274ec46f84d70b31c151321188b00000000000000000000000040ec5b33f54e0e8a33a975908c5ba1c14e5bbbdf0000000000000000000000007d1afa7b718fb893db30a3abc0cfc608aacfebb0000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2

-----Decoded View---------------
Arg [0] : _rootChainManager (address): 0xA0c68C638235ee32657e8f720a23ceC1bFc77C77
Arg [1] : _fxStateSender (address): 0xfe5e5D361b2ad62c541bAb87C45a0B9B018389a2
Arg [2] : _depositManager (address): 0x401F6c983eA34274ec46f84D70b31C151321188b
Arg [3] : _erc20Predicate (address): 0x40ec5B33f54e0E8A33A975908C5BA1c14e5BbbDf
Arg [4] : _l1Matic (address): 0x7D1AfA7B718fb893dB30A3aBc0Cfc608AaCfeBB0
Arg [5] : _l1Weth (address): 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2

-----Encoded View---------------
6 Constructor Arguments found :
Arg [0] : 000000000000000000000000a0c68c638235ee32657e8f720a23cec1bfc77c77
Arg [1] : 000000000000000000000000fe5e5d361b2ad62c541bab87c45a0b9b018389a2
Arg [2] : 000000000000000000000000401f6c983ea34274ec46f84d70b31c151321188b
Arg [3] : 00000000000000000000000040ec5b33f54e0e8a33a975908c5ba1c14e5bbbdf
Arg [4] : 0000000000000000000000007d1afa7b718fb893db30a3abc0cfc608aacfebb0
Arg [5] : 000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2


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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.