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// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.4;

import "./interfaces/ITransactionManager.sol";
import "./lib/LibAsset.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";

contract Router is Ownable {
  address public immutable routerFactory;

  ITransactionManager public transactionManager;

  uint256 private chainId;

  address public recipient;

  address public routerSigner;

  struct SignedPrepareData {
    ITransactionManager.PrepareArgs args;
    address routerRelayerFeeAsset;
    uint256 routerRelayerFee;
    uint256 chainId; // For domain separation
  }

  struct SignedFulfillData {
    ITransactionManager.FulfillArgs args;
    address routerRelayerFeeAsset;
    uint256 routerRelayerFee;
    uint256 chainId; // For domain separation
  }

  struct SignedCancelData {
    ITransactionManager.CancelArgs args;
    address routerRelayerFeeAsset;
    uint256 routerRelayerFee;
    uint256 chainId; // For domain separation
  }

  struct SignedRemoveLiquidityData {
    uint256 amount;
    address assetId;
    address routerRelayerFeeAsset;
    uint256 routerRelayerFee;
    uint256 chainId; // For domain separation
  }

  event RelayerFeeAdded(address assetId, uint256 amount, address caller);
  event RelayerFeeRemoved(address assetId, uint256 amount, address caller);
  event RemoveLiquidity(
    uint256 amount, 
    address assetId,
    address routerRelayerFeeAsset,
    uint256 routerRelayerFee, 
    address caller
  );
  event Prepare(
    ITransactionManager.InvariantTransactionData invariantData,
    address routerRelayerFeeAsset,
    uint256 routerRelayerFee,
    address caller
  );
  event Fulfill(
    ITransactionManager.TransactionData txData,
    address routerRelayerFeeAsset,
    uint256 routerRelayerFee,
    address caller
  );
  event Cancel(
    ITransactionManager.TransactionData txData,
    address routerRelayerFeeAsset,
    uint256 routerRelayerFee,
    address caller
  );

  constructor(address _routerFactory) {
    routerFactory = _routerFactory;
  }

  // Prevents from calling methods other than routerFactory contract
  modifier onlyViaFactory() {
    require(msg.sender == routerFactory, "ONLY_VIA_FACTORY");
    _;
  }

  function init(
    address _transactionManager,
    uint256 _chainId,
    address _routerSigner,
    address _recipient,
    address _owner
  ) external onlyViaFactory {
    transactionManager = ITransactionManager(_transactionManager);
    chainId = _chainId;
    routerSigner = _routerSigner;
    recipient = _recipient;
    transferOwnership(_owner);
  }

  function setRecipient(address _recipient) external onlyOwner {
    recipient = _recipient;
  }

  function setSigner(address _routerSigner) external onlyOwner {
    routerSigner = _routerSigner;
  }

  function addRelayerFee(uint256 amount, address assetId) external payable {
    // Sanity check: nonzero amounts
    require(amount > 0, "#RC_ARF:002");

    // Transfer funds to contract
    // Validate correct amounts are transferred
    if (LibAsset.isNativeAsset(assetId)) {
      require(msg.value == amount, "#RC_ARF:005");
    } else {
      require(msg.value == 0, "#RC_ARF:006");
      LibAsset.transferFromERC20(assetId, msg.sender, address(this), amount);
    }

    // Emit event
    emit RelayerFeeAdded(assetId, amount, msg.sender);
  }

  function removeRelayerFee(uint256 amount, address assetId) external onlyOwner {
    // Sanity check: nonzero amounts
    require(amount > 0, "#RC_RRF:002");

    // Transfer funds from contract
    LibAsset.transferAsset(assetId, payable(recipient), amount);

    // Emit event
    emit RelayerFeeRemoved(assetId, amount, msg.sender);
  }

  function removeLiquidity(
    uint256 amount,
    address assetId,
    address routerRelayerFeeAsset,
    uint256 routerRelayerFee,
    bytes calldata signature
  ) external {
    if (msg.sender != routerSigner) {
      SignedRemoveLiquidityData memory payload = SignedRemoveLiquidityData({
        amount: amount,
        assetId: assetId,
        routerRelayerFeeAsset: routerRelayerFeeAsset,
        routerRelayerFee: routerRelayerFee,
        chainId: chainId
      });

      address recovered = recoverSignature(abi.encode(payload), signature);
      require(recovered == routerSigner, "#RC_RL:040");

      // Send the relayer the fee
      if (routerRelayerFee > 0) {
        LibAsset.transferAsset(routerRelayerFeeAsset, payable(msg.sender), routerRelayerFee);
      }
    }

    emit RemoveLiquidity(amount, assetId, routerRelayerFeeAsset, routerRelayerFee, msg.sender);
    return transactionManager.removeLiquidity(amount, assetId, payable(recipient));
  }

  function prepare(
    ITransactionManager.PrepareArgs calldata args,
    address routerRelayerFeeAsset,
    uint256 routerRelayerFee,
    bytes calldata signature
  ) external payable returns (ITransactionManager.TransactionData memory) {
    if (msg.sender != routerSigner) {
      SignedPrepareData memory payload = SignedPrepareData({
        args: args,
        routerRelayerFeeAsset: routerRelayerFeeAsset,
        routerRelayerFee: routerRelayerFee,
        chainId: chainId
      });

      address recovered = recoverSignature(abi.encode(payload), signature);
      require(recovered == routerSigner, "#RC_P:040");

      // Send the relayer the fee
      if (routerRelayerFee > 0) {
        LibAsset.transferAsset(routerRelayerFeeAsset, payable(msg.sender), routerRelayerFee);
      }
    }

    emit Prepare(args.invariantData, routerRelayerFeeAsset, routerRelayerFee, msg.sender);
    return transactionManager.prepare(args);
  }

  function fulfill(
    ITransactionManager.FulfillArgs calldata args,
    address routerRelayerFeeAsset,
    uint256 routerRelayerFee,
    bytes calldata signature
  ) external returns (ITransactionManager.TransactionData memory) {
    if (msg.sender != routerSigner) {
      SignedFulfillData memory payload = SignedFulfillData({
        args: args,
        routerRelayerFeeAsset: routerRelayerFeeAsset,
        routerRelayerFee: routerRelayerFee,
        chainId: chainId
      });

      address recovered = recoverSignature(abi.encode(payload), signature);
      require(recovered == routerSigner, "#RC_F:040");

      // Send the relayer the fee
      if (routerRelayerFee > 0) {
        LibAsset.transferAsset(routerRelayerFeeAsset, payable(msg.sender), routerRelayerFee);
      }
    }
    emit Fulfill(args.txData, routerRelayerFeeAsset, routerRelayerFee, msg.sender);
    return transactionManager.fulfill(args);
  }

  function cancel(
    ITransactionManager.CancelArgs calldata args,
    address routerRelayerFeeAsset,
    uint256 routerRelayerFee,
    bytes calldata signature
  ) external returns (ITransactionManager.TransactionData memory) {
    if (msg.sender != routerSigner) {
      SignedCancelData memory payload = SignedCancelData({
        args: args,
        routerRelayerFeeAsset: routerRelayerFeeAsset,
        routerRelayerFee: routerRelayerFee,
        chainId: chainId
      });

      address recovered = recoverSignature(abi.encode(payload), signature);
      require(recovered == routerSigner, "#RC_C:040");

      // Send the relayer the fee
      if (routerRelayerFee > 0) {
        LibAsset.transferAsset(routerRelayerFeeAsset, payable(msg.sender), routerRelayerFee);
      }
    }
    emit Cancel(args.txData, routerRelayerFeeAsset, routerRelayerFee, msg.sender);
    return transactionManager.cancel(args);
  }

  /**
   * @notice Holds the logic to recover the routerSigner from an encoded payload.
   *         Will hash and convert to an eth signed message.
   * @param encodedPayload The payload that was signed
   * @param signature The signature you are recovering the routerSigner from
   */
  function recoverSignature(bytes memory encodedPayload, bytes calldata signature) internal pure returns (address) {
    // Recover
    return ECDSA.recover(ECDSA.toEthSignedMessageHash(keccak256(encodedPayload)), signature);
  }

  receive() external payable {}
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.8.4;

interface ITransactionManager {
  // Structs

  // Holds all data that is constant between sending and
  // receiving chains. The hash of this is what gets signed
  // to ensure the signature can be used on both chains.
  struct InvariantTransactionData {
    address receivingChainTxManagerAddress;
    address user;
    address router;
    address initiator; // msg.sender of sending side
    address sendingAssetId;
    address receivingAssetId;
    address sendingChainFallback; // funds sent here on cancel
    address receivingAddress;
    address callTo;
    uint256 sendingChainId;
    uint256 receivingChainId;
    bytes32 callDataHash; // hashed to prevent free option
    bytes32 transactionId;
  }

  // Holds all data that varies between sending and receiving
  // chains. The hash of this is stored onchain to ensure the
  // information passed in is valid.
  struct VariantTransactionData {
    uint256 amount;
    uint256 expiry;
    uint256 preparedBlockNumber;
  }

  // All Transaction data, constant and variable
  struct TransactionData {
    address receivingChainTxManagerAddress;
    address user;
    address router;
    address initiator; // msg.sender of sending side
    address sendingAssetId;
    address receivingAssetId;
    address sendingChainFallback;
    address receivingAddress;
    address callTo;
    bytes32 callDataHash;
    bytes32 transactionId;
    uint256 sendingChainId;
    uint256 receivingChainId;
    uint256 amount;
    uint256 expiry;
    uint256 preparedBlockNumber; // Needed for removal of active blocks on fulfill/cancel
  }

  // The structure of the signed data for fulfill
  struct SignedFulfillData {
    bytes32 transactionId;
    uint256 relayerFee;
    string functionIdentifier; // "fulfill" or "cancel"
    uint256 receivingChainId; // For domain separation
    address receivingChainTxManagerAddress; // For domain separation
  }

  // The structure of the signed data for cancellation
  struct SignedCancelData {
    bytes32 transactionId;
    string functionIdentifier;
    uint256 receivingChainId;
    address receivingChainTxManagerAddress; // For domain separation
  }

  /**
    * Arguments for calling prepare()
    * @param invariantData The data for a crosschain transaction that will
    *                      not change between sending and receiving chains.
    *                      The hash of this data is used as the key to store 
    *                      the inforamtion that does change between chains 
    *                      (amount,expiry,preparedBlock) for verification
    * @param amount The amount of the transaction on this chain
    * @param expiry The block.timestamp when the transaction will no longer be
    *               fulfillable and is freely cancellable on this chain
    * @param encryptedCallData The calldata to be executed when the tx is
    *                          fulfilled. Used in the function to allow the user
    *                          to reconstruct the tx from events. Hash is stored
    *                          onchain to prevent shenanigans.
    * @param encodedBid The encoded bid that was accepted by the user for this
    *                   crosschain transfer. It is supplied as a param to the
    *                   function but is only used in event emission
    * @param bidSignature The signature of the bidder on the encoded bid for
    *                     this transaction. Only used within the function for
    *                     event emission. The validity of the bid and
    *                     bidSignature are enforced offchain
    * @param encodedMeta The meta for the function
    */
  struct PrepareArgs {
    InvariantTransactionData invariantData;
    uint256 amount;
    uint256 expiry;
    bytes encryptedCallData;
    bytes encodedBid;
    bytes bidSignature;
    bytes encodedMeta;
  }

  /**
    * @param txData All of the data (invariant and variant) for a crosschain
    *               transaction. The variant data provided is checked against
    *               what was stored when the `prepare` function was called.
    * @param relayerFee The fee that should go to the relayer when they are
    *                   calling the function on the receiving chain for the user
    * @param signature The users signature on the transaction id + fee that
    *                  can be used by the router to unlock the transaction on 
    *                  the sending chain
    * @param callData The calldata to be sent to and executed by the 
    *                 `FulfillHelper`
    * @param encodedMeta The meta for the function
    */
  struct FulfillArgs {
    TransactionData txData;
    uint256 relayerFee;
    bytes signature;
    bytes callData;
    bytes encodedMeta;
  }

  /**
    * Arguments for calling cancel()
    * @param txData All of the data (invariant and variant) for a crosschain
    *               transaction. The variant data provided is checked against
    *               what was stored when the `prepare` function was called.
    * @param signature The user's signature that allows a transaction to be
    *                  cancelled by a relayer
    * @param encodedMeta The meta for the function
    */
  struct CancelArgs {
    TransactionData txData;
    bytes signature;
    bytes encodedMeta;
  }

  // Adding/removing asset events
  event RouterAdded(address indexed addedRouter, address indexed caller);

  event RouterRemoved(address indexed removedRouter, address indexed caller);

  // Adding/removing router events
  event AssetAdded(address indexed addedAssetId, address indexed caller);

  event AssetRemoved(address indexed removedAssetId, address indexed caller);

  // Liquidity events
  event LiquidityAdded(address indexed router, address indexed assetId, uint256 amount, address caller);

  event LiquidityRemoved(address indexed router, address indexed assetId, uint256 amount, address recipient);

  // Transaction events
  event TransactionPrepared(
    address indexed user,
    address indexed router,
    bytes32 indexed transactionId,
    TransactionData txData,
    address caller,
    PrepareArgs args
  );

  event TransactionFulfilled(
    address indexed user,
    address indexed router,
    bytes32 indexed transactionId,
    FulfillArgs args,
    bool success,
    bool isContract,
    bytes returnData,
    address caller
  );

  event TransactionCancelled(
    address indexed user,
    address indexed router,
    bytes32 indexed transactionId,
    CancelArgs args,
    address caller
  );

  // Getters
  function getChainId() external view returns (uint256);

  function getStoredChainId() external view returns (uint256);

  // Owner only methods
  function addRouter(address router) external;

  function removeRouter(address router) external;

  function addAssetId(address assetId) external;

  function removeAssetId(address assetId) external;

  // Router only methods
  function addLiquidityFor(uint256 amount, address assetId, address router) external payable;

  function addLiquidity(uint256 amount, address assetId) external payable;

  function removeLiquidity(
    uint256 amount,
    address assetId,
    address payable recipient
  ) external;

  // Methods for crosschain transfers
  // called in the following order (in happy case)
  // 1. prepare by user on sending chain
  // 2. prepare by router on receiving chain
  // 3. fulfill by user on receiving chain
  // 4. fulfill by router on sending chain
  function prepare(
    PrepareArgs calldata args
  ) external payable returns (TransactionData memory);

  function fulfill(
    FulfillArgs calldata args
  ) external returns (TransactionData memory);

  function cancel(CancelArgs calldata args) external returns (TransactionData memory);
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.8.4;

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


/**
* @title LibAsset
* @author Connext <[email protected]>
* @notice This library contains helpers for dealing with onchain transfers
*         of assets, including accounting for the native asset `assetId`
*         conventions and any noncompliant ERC20 transfers
*/
library LibAsset {
  /** 
  * @dev All native assets use the empty address for their asset id
  *      by convention
  */
  address constant NATIVE_ASSETID = address(0);

  /** 
  * @notice Determines whether the given assetId is the native asset
  * @param assetId The asset identifier to evaluate
  * @return Boolean indicating if the asset is the native asset
  */
  function isNativeAsset(address assetId) internal pure returns (bool) {
    return assetId == NATIVE_ASSETID;
  }

  /** 
  * @notice Gets the balance of the inheriting contract for the given asset
  * @param assetId The asset identifier to get the balance of
  * @return Balance held by contracts using this library
  */
  function getOwnBalance(address assetId) internal view returns (uint256) {
    return
      isNativeAsset(assetId)
        ? address(this).balance
        : IERC20(assetId).balanceOf(address(this));
  }

  /** 
  * @notice Transfers ether from the inheriting contract to a given
  *         recipient
  * @param recipient Address to send ether to
  * @param amount Amount to send to given recipient
  */
  function transferNativeAsset(address payable recipient, uint256 amount)
      internal
  {
    Address.sendValue(recipient, amount);
  }

  /** 
  * @notice Transfers tokens from the inheriting contract to a given
  *         recipient
  * @param assetId Token address to transfer
  * @param recipient Address to send ether to
  * @param amount Amount to send to given recipient
  */
  function transferERC20(
      address assetId,
      address recipient,
      uint256 amount
  ) internal {
    SafeERC20.safeTransfer(IERC20(assetId), recipient, amount);
  }

  /** 
  * @notice Transfers tokens from a sender to a given recipient
  * @param assetId Token address to transfer
  * @param from Address of sender/owner
  * @param to Address of recipient/spender
  * @param amount Amount to transfer from owner to spender
  */
  function transferFromERC20(
    address assetId,
    address from,
    address to,
    uint256 amount
  ) internal {
    SafeERC20.safeTransferFrom(IERC20(assetId), from, to, amount);
  }

  /** 
  * @notice Increases the allowance of a token to a spender
  * @param assetId Token address of asset to increase allowance of
  * @param spender Account whos allowance is increased
  * @param amount Amount to increase allowance by
  */
  function increaseERC20Allowance(
    address assetId,
    address spender,
    uint256 amount
  ) internal {
    require(!isNativeAsset(assetId), "#IA:034");
    SafeERC20.safeIncreaseAllowance(IERC20(assetId), spender, amount);
  }

  /**
  * @notice Decreases the allowance of a token to a spender
  * @param assetId Token address of asset to decrease allowance of
  * @param spender Account whos allowance is decreased
  * @param amount Amount to decrease allowance by
  */
  function decreaseERC20Allowance(
    address assetId,
    address spender,
    uint256 amount
  ) internal {
    require(!isNativeAsset(assetId), "#DA:034");
    SafeERC20.safeDecreaseAllowance(IERC20(assetId), spender, amount);
  }

  /**
  * @notice Wrapper function to transfer a given asset (native or erc20) to
  *         some recipient. Should handle all non-compliant return value
  *         tokens as well by using the SafeERC20 contract by open zeppelin.
  * @param assetId Asset id for transfer (address(0) for native asset, 
  *                token address for erc20s)
  * @param recipient Address to send asset to
  * @param amount Amount to send to given recipient
  */
  function transferAsset(
      address assetId,
      address payable recipient,
      uint256 amount
  ) internal {
    isNativeAsset(assetId)
      ? transferNativeAsset(recipient, amount)
      : transferERC20(assetId, recipient, amount);
  }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _setOwner(_msgSender());
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _setOwner(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _setOwner(newOwner);
    }

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     *
     * Documentation for signature generation:
     * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
     * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        // Check the signature length
        // - case 65: r,s,v signature (standard)
        // - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._
        if (signature.length == 65) {
            bytes32 r;
            bytes32 s;
            uint8 v;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
            return recover(hash, v, r, s);
        } else if (signature.length == 64) {
            bytes32 r;
            bytes32 vs;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly {
                r := mload(add(signature, 0x20))
                vs := mload(add(signature, 0x40))
            }
            return recover(hash, r, vs);
        } else {
            revert("ECDSA: invalid signature length");
        }
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `r` and `vs` short-signature fields separately.
     *
     * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
     *
     * _Available since v4.2._
     */
    function recover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address) {
        bytes32 s;
        uint8 v;
        assembly {
            s := and(vs, 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff)
            v := add(shr(255, vs), 27)
        }
        return recover(hash, v, r, s);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `v`, `r` and `s` signature fields separately.
     */
    function recover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address) {
        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (281): 0 < s < secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        require(
            uint256(s) <= 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0,
            "ECDSA: invalid signature 's' value"
        );
        require(v == 27 || v == 28, "ECDSA: invalid signature 'v' value");

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        require(signer != address(0), "ECDSA: invalid signature");

        return signer;
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from a `hash`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {
        // 32 is the length in bytes of hash,
        // enforced by the type signature above
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
    }

    /**
     * @dev Returns an Ethereum Signed Typed Data, created from a
     * `domainSeparator` and a `structHash`. This produces hash corresponding
     * to the one signed with the
     * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]
     * JSON-RPC method as part of EIP-712.
     *
     * See {recover}.
     */
    function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
    }
}

// SPDX-License-Identifier: MIT

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

pragma solidity ^0.8.0;

/**
 * @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
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 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);
    }

    function _verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) private 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: MIT

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 `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, 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 `sender` to `recipient` 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 sender,
        address recipient,
        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

pragma solidity ^0.8.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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ITransactionManager.InvariantTransactionData","name":"invariantData","type":"tuple"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"expiry","type":"uint256"},{"internalType":"bytes","name":"encryptedCallData","type":"bytes"},{"internalType":"bytes","name":"encodedBid","type":"bytes"},{"internalType":"bytes","name":"bidSignature","type":"bytes"},{"internalType":"bytes","name":"encodedMeta","type":"bytes"}],"internalType":"struct ITransactionManager.PrepareArgs","name":"args","type":"tuple"},{"internalType":"address","name":"routerRelayerFeeAsset","type":"address"},{"internalType":"uint256","name":"routerRelayerFee","type":"uint256"},{"internalType":"bytes","name":"signature","type":"bytes"}],"name":"prepare","outputs":[{"components":[{"internalType":"address","name":"receivingChainTxManagerAddress","type":"address"},{"internalType":"address","name":"user","type":"address"},{"internalType":"address","name":"router","type":"address"},{"internalType":"address","name":"initiator","type":"address"},{"internalType":"address","name":"sendingAssetId","type":"address"},{"internalType":"address","name":"receivingAssetId","type":"address"},{"internalType":"address","name":"sendingChainFallback","type":"address"},{"internalType":"address","name":"receivingAddress","type":"address"},{"internalType":"address","name":"callTo","type":"address"},{"internalType":"bytes32","name":"callDataHash","type":"bytes32"},{"internalType":"bytes32","name":"transactionId","type":"bytes32"},{"internalType":"uint256","name":"sendingChainId","type":"uint256"},{"internalType":"uint256","name":"receivingChainId","type":"uint256"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"expiry","type":"uint256"},{"internalType":"uint256","name":"preparedBlockNumber","type":"uint256"}],"internalType":"struct ITransactionManager.TransactionData","name":"","type":"tuple"}],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"recipient","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"address","name":"assetId","type":"address"},{"internalType":"address","name":"routerRelayerFeeAsset","type":"address"},{"internalType":"uint256","name":"routerRelayerFee","type":"uint256"},{"internalType":"bytes","name":"signature","type":"bytes"}],"name":"removeLiquidity","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"address","name":"assetId","type":"address"}],"name":"removeRelayerFee","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"routerFactory","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"routerSigner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_recipient","type":"address"}],"name":"setRecipient","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_routerSigner","type":"address"}],"name":"setSigner","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"transactionManager","outputs":[{"internalType":"contract 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