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// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.8.19;

import {ITypeAndVersion} from "../../shared/interfaces/ITypeAndVersion.sol";
import {IPool} from "../interfaces/pools/IPool.sol";
import {IARM} from "../interfaces/IARM.sol";
import {IPriceRegistry} from "../interfaces/IPriceRegistry.sol";
import {IEVM2AnyOnRamp} from "../interfaces/IEVM2AnyOnRamp.sol";
import {IEVM2AnyOnRampClient} from "../interfaces/IEVM2AnyOnRampClient.sol";
import {ILinkAvailable} from "../interfaces/automation/ILinkAvailable.sol";

import {AggregateRateLimiter} from "../AggregateRateLimiter.sol";
import {Client} from "../libraries/Client.sol";
import {Internal} from "../libraries/Internal.sol";
import {RateLimiter} from "../libraries/RateLimiter.sol";
import {USDPriceWith18Decimals} from "../libraries/USDPriceWith18Decimals.sol";
import {EnumerableMapAddresses} from "../../shared/enumerable/EnumerableMapAddresses.sol";

import {SafeERC20} from "../../vendor/openzeppelin-solidity/v4.8.0/contracts/token/ERC20/utils/SafeERC20.sol";
import {IERC20} from "../../vendor/openzeppelin-solidity/v4.8.0/contracts/token/ERC20/IERC20.sol";
import {EnumerableMap} from "../../vendor/openzeppelin-solidity/v4.8.0/contracts/utils/structs/EnumerableMap.sol";

/// @notice The onRamp is a contract that handles lane-specific fee logic, NOP payments and
/// bridgeable token support.
/// @dev The EVM2EVMOnRamp, CommitStore and EVM2EVMOffRamp form an xchain upgradeable unit. Any change to one of them
/// results an onchain upgrade of all 3.
contract EVM2EVMOnRamp is IEVM2AnyOnRamp, ILinkAvailable, AggregateRateLimiter, ITypeAndVersion {
  using SafeERC20 for IERC20;
  using EnumerableMap for EnumerableMap.AddressToUintMap;
  using EnumerableMapAddresses for EnumerableMapAddresses.AddressToAddressMap;
  using USDPriceWith18Decimals for uint224;

  error InvalidExtraArgsTag();
  error OnlyCallableByOwnerOrAdmin();
  error OnlyCallableByOwnerOrAdminOrNop();
  error InvalidWithdrawParams();
  error NoFeesToPay();
  error NoNopsToPay();
  error InsufficientBalance();
  error TooManyNops();
  error MaxFeeBalanceReached();
  error MessageTooLarge(uint256 maxSize, uint256 actualSize);
  error MessageGasLimitTooHigh();
  error UnsupportedNumberOfTokens();
  error UnsupportedToken(IERC20 token);
  error MustBeCalledByRouter();
  error RouterMustSetOriginalSender();
  error InvalidTokenPoolConfig();
  error PoolAlreadyAdded();
  error PoolDoesNotExist(address token);
  error TokenPoolMismatch();
  error InvalidConfig();
  error InvalidAddress(bytes encodedAddress);
  error BadARMSignal();
  error LinkBalanceNotSettled();
  error InvalidNopAddress(address nop);
  error NotAFeeToken(address token);
  error CannotSendZeroTokens();
  error SourceTokenDataTooLarge(address token);
  error InvalidChainSelector(uint64 chainSelector);

  event ConfigSet(StaticConfig staticConfig, DynamicConfig dynamicConfig);
  event NopPaid(address indexed nop, uint256 amount);
  event FeeConfigSet(FeeTokenConfigArgs[] feeConfig);
  event TokenTransferFeeConfigSet(TokenTransferFeeConfigArgs[] transferFeeConfig);
  /// RMN depends on this event, if changing, please notify the RMN maintainers.
  event CCIPSendRequested(Internal.EVM2EVMMessage message);
  event NopsSet(uint256 nopWeightsTotal, NopAndWeight[] nopsAndWeights);
  event PoolAdded(address token, address pool);
  event PoolRemoved(address token, address pool);

  /// @dev Struct that contains the static configuration
  /// RMN depends on this struct, if changing, please notify the RMN maintainers.
  struct StaticConfig {
    address linkToken; // ────────╮ Link token address
    uint64 chainSelector; // ─────╯ Source chainSelector
    uint64 destChainSelector; // ─╮ Destination chainSelector
    uint64 defaultTxGasLimit; //  │ Default gas limit for a tx
    uint96 maxNopFeesJuels; // ───╯ Max nop fee balance onramp can have
    address prevOnRamp; //          Address of previous-version OnRamp
    address armProxy; //            Address of ARM proxy
  }

  /// @dev Struct to contains the dynamic configuration
  struct DynamicConfig {
    address router; // ──────────────────────────╮ Router address
    uint16 maxNumberOfTokensPerMsg; //           │ Maximum number of distinct ERC20 token transferred per message
    uint32 destGasOverhead; //                   │ Gas charged on top of the gasLimit to cover destination chain costs
    uint16 destGasPerPayloadByte; //             │ Destination chain gas charged for passing each byte of `data` payload to receiver
    uint32 destDataAvailabilityOverheadGas; // ──╯ Extra data availability gas charged on top of the message, e.g. for OCR
    uint16 destGasPerDataAvailabilityByte; // ───╮ Amount of gas to charge per byte of message data that needs availability
    uint16 destDataAvailabilityMultiplierBps; // │ Multiplier for data availability gas, multiples of bps, or 0.0001
    address priceRegistry; //                    │ Price registry address
    uint32 maxDataBytes; //                      │ Maximum payload data size in bytes
    uint32 maxPerMsgGasLimit; // ────────────────╯ Maximum gas limit for messages targeting EVMs
  }

  /// @dev Struct to hold the execution fee configuration for a fee token
  struct FeeTokenConfig {
    uint32 networkFeeUSDCents; // ─────────╮ Flat network fee to charge for messages,  multiples of 0.01 USD
    uint64 gasMultiplierWeiPerEth; //      │ Multiplier for gas costs, 1e18 based so 11e17 = 10% extra cost.
    uint64 premiumMultiplierWeiPerEth; //  │ Multiplier for fee-token-specific premiums
    bool enabled; // ──────────────────────╯ Whether this fee token is enabled
  }

  /// @dev Struct to hold the fee configuration for a fee token, same as the FeeTokenConfig but with
  /// token included so that an array of these can be passed in to setFeeTokenConfig to set the mapping
  struct FeeTokenConfigArgs {
    address token; // ─────────────────────╮ Token address
    uint32 networkFeeUSDCents; //          │ Flat network fee to charge for messages,  multiples of 0.01 USD
    uint64 gasMultiplierWeiPerEth; // ─────╯ Multiplier for gas costs, 1e18 based so 11e17 = 10% extra cost
    uint64 premiumMultiplierWeiPerEth; // ─╮ Multiplier for fee-token-specific premiums, 1e18 based
    bool enabled; // ──────────────────────╯ Whether this fee token is enabled
  }

  /// @dev Struct to hold the transfer fee configuration for token transfers
  struct TokenTransferFeeConfig {
    uint32 minFeeUSDCents; // ────╮ Minimum fee to charge per token transfer, multiples of 0.01 USD
    uint32 maxFeeUSDCents; //     │ Maximum fee to charge per token transfer, multiples of 0.01 USD
    uint16 deciBps; //            │ Basis points charged on token transfers, multiples of 0.1bps, or 1e-5
    uint32 destGasOverhead; //    │ Gas charged to execute the token transfer on the destination chain
    uint32 destBytesOverhead; // ─╯ Extra data availability bytes on top of fixed transfer data, including sourceTokenData and offchainData
  }

  /// @dev Same as TokenTransferFeeConfig
  /// token included so that an array of these can be passed in to setTokenTransferFeeConfig
  struct TokenTransferFeeConfigArgs {
    address token; // ────────────╮ Token address
    uint32 minFeeUSDCents; //     │ Minimum fee to charge per token transfer, multiples of 0.01 USD
    uint32 maxFeeUSDCents; //     │ Maximum fee to charge per token transfer, multiples of 0.01 USD
    uint16 deciBps; // ───────────╯ Basis points charged on token transfers, multiples of 0.1bps, or 1e-5
    uint32 destGasOverhead; // ───╮ Gas charged to execute the token transfer on the destination chain
    uint32 destBytesOverhead; // ─╯ Extra data availability bytes on top of fixed transfer data, including sourceTokenData and offchainData
  }

  /// @dev Nop address and weight, used to set the nops and their weights
  struct NopAndWeight {
    address nop; // ────╮ Address of the node operator
    uint16 weight; // ──╯ Weight for nop rewards
  }

  // STATIC CONFIG
  // solhint-disable-next-line chainlink-solidity/all-caps-constant-storage-variables
  string public constant override typeAndVersion = "EVM2EVMOnRamp 1.2.0";
  /// @dev metadataHash is a lane-specific prefix for a message hash preimage which ensures global uniqueness
  /// Ensures that 2 identical messages sent to 2 different lanes will have a distinct hash.
  /// Must match the metadataHash used in computing leaf hashes offchain for the root committed in
  /// the commitStore and i_metadataHash in the offRamp.
  bytes32 internal immutable i_metadataHash;
  /// @dev Default gas limit for a transactions that did not specify
  /// a gas limit in the extraArgs.
  uint64 internal immutable i_defaultTxGasLimit;
  /// @dev Maximum nop fee that can accumulate in this onramp
  uint96 internal immutable i_maxNopFeesJuels;
  /// @dev The link token address - known to pay nops for their work
  address internal immutable i_linkToken;
  /// @dev The chain ID of the source chain that this contract is deployed to
  uint64 internal immutable i_chainSelector;
  /// @dev The chain ID of the destination chain
  uint64 internal immutable i_destChainSelector;
  /// @dev The address of previous-version OnRamp for this lane
  /// Used to be able to provide sequencing continuity during a zero downtime upgrade.
  address internal immutable i_prevOnRamp;
  /// @dev The address of the arm proxy
  address internal immutable i_armProxy;
  /// @dev the maximum number of nops that can be configured at the same time.
  /// Used to bound gas for loops over nops.
  uint256 private constant MAX_NUMBER_OF_NOPS = 64;

  // DYNAMIC CONFIG
  /// @dev The config for the onRamp
  DynamicConfig internal s_dynamicConfig;
  /// @dev (address nop => uint256 weight)
  EnumerableMap.AddressToUintMap internal s_nops;
  /// @dev source token => token pool
  EnumerableMapAddresses.AddressToAddressMap private s_poolsBySourceToken;

  /// @dev The execution fee token config that can be set by the owner or fee admin
  mapping(address token => FeeTokenConfig feeTokenConfig) internal s_feeTokenConfig;
  /// @dev The token transfer fee config that can be set by the owner or fee admin
  mapping(address token => TokenTransferFeeConfig tranferFeeConfig) internal s_tokenTransferFeeConfig;

  // STATE
  /// @dev The current nonce per sender.
  /// The offramp has a corresponding s_senderNonce mapping to ensure messages
  /// are executed in the same order they are sent.
  mapping(address sender => uint64 nonce) internal s_senderNonce;
  /// @dev The amount of LINK available to pay NOPS
  uint96 internal s_nopFeesJuels;
  /// @dev The combined weight of all NOPs weights
  uint32 internal s_nopWeightsTotal;
  /// @dev The last used sequence number. This is zero in the case where no
  /// messages has been sent yet. 0 is not a valid sequence number for any
  /// real transaction.
  uint64 internal s_sequenceNumber;

  constructor(
    StaticConfig memory staticConfig,
    DynamicConfig memory dynamicConfig,
    Internal.PoolUpdate[] memory tokensAndPools,
    RateLimiter.Config memory rateLimiterConfig,
    FeeTokenConfigArgs[] memory feeTokenConfigs,
    TokenTransferFeeConfigArgs[] memory tokenTransferFeeConfigArgs,
    NopAndWeight[] memory nopsAndWeights
  ) AggregateRateLimiter(rateLimiterConfig) {
    if (
      staticConfig.linkToken == address(0) ||
      staticConfig.chainSelector == 0 ||
      staticConfig.destChainSelector == 0 ||
      staticConfig.defaultTxGasLimit == 0 ||
      staticConfig.armProxy == address(0)
    ) revert InvalidConfig();

    i_metadataHash = keccak256(
      abi.encode(
        Internal.EVM_2_EVM_MESSAGE_HASH,
        staticConfig.chainSelector,
        staticConfig.destChainSelector,
        address(this)
      )
    );
    i_linkToken = staticConfig.linkToken;
    i_chainSelector = staticConfig.chainSelector;
    i_destChainSelector = staticConfig.destChainSelector;
    i_defaultTxGasLimit = staticConfig.defaultTxGasLimit;
    i_maxNopFeesJuels = staticConfig.maxNopFeesJuels;
    i_prevOnRamp = staticConfig.prevOnRamp;
    i_armProxy = staticConfig.armProxy;

    _setDynamicConfig(dynamicConfig);
    _setFeeTokenConfig(feeTokenConfigs);
    _setTokenTransferFeeConfig(tokenTransferFeeConfigArgs);
    _setNops(nopsAndWeights);

    // Set new tokens and pools
    _applyPoolUpdates(new Internal.PoolUpdate[](0), tokensAndPools);
  }

  // ================================================================
  // │                          Messaging                           │
  // ================================================================

  /// @inheritdoc IEVM2AnyOnRamp
  function getExpectedNextSequenceNumber() external view returns (uint64) {
    return s_sequenceNumber + 1;
  }

  /// @inheritdoc IEVM2AnyOnRamp
  function getSenderNonce(address sender) external view returns (uint64) {
    uint256 senderNonce = s_senderNonce[sender];

    if (senderNonce == 0 && i_prevOnRamp != address(0)) {
      // If OnRamp was upgraded, check if sender has a nonce from the previous OnRamp.
      return IEVM2AnyOnRamp(i_prevOnRamp).getSenderNonce(sender);
    }
    return uint64(senderNonce);
  }

  /// @inheritdoc IEVM2AnyOnRampClient
  function forwardFromRouter(
    uint64 destChainSelector,
    Client.EVM2AnyMessage calldata message,
    uint256 feeTokenAmount,
    address originalSender
  ) external whenHealthy returns (bytes32) {
    // Validate message sender is set and allowed. Not validated in `getFee` since it is not user-driven.
    if (originalSender == address(0)) revert RouterMustSetOriginalSender();
    // Router address may be zero intentionally to pause.
    if (msg.sender != s_dynamicConfig.router) revert MustBeCalledByRouter();
    if (destChainSelector != i_destChainSelector) revert InvalidChainSelector(destChainSelector);

    // EVM destination addresses should be abi encoded and therefore always 32 bytes long
    // Not duplicately validated in `getFee`. Invalid address is uncommon, gas cost outweighs UX gain.
    if (message.receiver.length != 32) revert InvalidAddress(message.receiver);
    uint256 decodedReceiver = abi.decode(message.receiver, (uint256));
    // We want to disallow sending to address(0) and to precompiles, which exist on address(1) through address(9).
    if (decodedReceiver > type(uint160).max || decodedReceiver < 10) revert InvalidAddress(message.receiver);

    uint256 gasLimit = _fromBytes(message.extraArgs).gasLimit;
    // Validate the message with various checks
    uint256 numberOfTokens = message.tokenAmounts.length;
    _validateMessage(message.data.length, gasLimit, numberOfTokens);

    // Only check token value if there are tokens
    if (numberOfTokens > 0) {
      for (uint256 i = 0; i < numberOfTokens; ++i) {
        if (message.tokenAmounts[i].amount == 0) revert CannotSendZeroTokens();
      }
      // Rate limit on aggregated token value
      _rateLimitValue(message.tokenAmounts, IPriceRegistry(s_dynamicConfig.priceRegistry));
    }

    // Convert feeToken to link if not already in link
    if (message.feeToken == i_linkToken) {
      // Since there is only 1b link this is safe
      s_nopFeesJuels += uint96(feeTokenAmount);
    } else {
      // the cast from uint256 to uint96 is considered safe, uint96 can store more than max supply of link token
      s_nopFeesJuels += uint96(
        IPriceRegistry(s_dynamicConfig.priceRegistry).convertTokenAmount(message.feeToken, feeTokenAmount, i_linkToken)
      );
    }
    if (s_nopFeesJuels > i_maxNopFeesJuels) revert MaxFeeBalanceReached();

    if (s_senderNonce[originalSender] == 0 && i_prevOnRamp != address(0)) {
      // If this is first time send for a sender in new OnRamp, check if they have a nonce
      // from the previous OnRamp and start from there instead of zero.
      s_senderNonce[originalSender] = IEVM2AnyOnRamp(i_prevOnRamp).getSenderNonce(originalSender);
    }

    // We need the next available sequence number so we increment before we use the value
    Internal.EVM2EVMMessage memory newMessage = Internal.EVM2EVMMessage({
      sourceChainSelector: i_chainSelector,
      sender: originalSender,
      receiver: address(uint160(decodedReceiver)),
      sequenceNumber: ++s_sequenceNumber,
      gasLimit: gasLimit,
      strict: false,
      nonce: ++s_senderNonce[originalSender],
      feeToken: message.feeToken,
      feeTokenAmount: feeTokenAmount,
      data: message.data,
      tokenAmounts: message.tokenAmounts,
      sourceTokenData: new bytes[](numberOfTokens), // will be filled in later
      messageId: ""
    });

    // Lock the tokens as last step. TokenPools may not always be trusted.
    // There should be no state changes after external call to TokenPools.
    for (uint256 i = 0; i < numberOfTokens; ++i) {
      Client.EVMTokenAmount memory tokenAndAmount = message.tokenAmounts[i];
      bytes memory tokenData = getPoolBySourceToken(destChainSelector, IERC20(tokenAndAmount.token)).lockOrBurn(
        originalSender,
        message.receiver,
        tokenAndAmount.amount,
        i_destChainSelector,
        bytes("") // any future extraArgs component would be added here
      );

      // Since the DON has to pay for the tokenData to be included on the destination chain, we cap the length of the tokenData.
      // This prevents gas bomb attacks on the NOPs. We use destBytesOverhead as a proxy to cap the number of bytes we accept.
      // As destBytesOverhead accounts for tokenData + offchainData, this caps the worst case abuse to the number of bytes reserved for offchainData.
      // It therefore fully mitigates gas bombs for most tokens, as most tokens don't use offchainData.
      if (tokenData.length > s_tokenTransferFeeConfig[tokenAndAmount.token].destBytesOverhead)
        revert SourceTokenDataTooLarge(tokenAndAmount.token);

      newMessage.sourceTokenData[i] = tokenData;
    }

    // Hash only after the sourceTokenData has been set
    newMessage.messageId = Internal._hash(newMessage, i_metadataHash);

    // Emit message request
    // Note this must happen after pools, some tokens (eg USDC) emit events that we
    // expect to directly precede this event.
    emit CCIPSendRequested(newMessage);
    return newMessage.messageId;
  }

  /// @dev Convert the extra args bytes into a struct
  /// @param extraArgs The extra args bytes
  /// @return The extra args struct
  function _fromBytes(bytes calldata extraArgs) internal view returns (Client.EVMExtraArgsV1 memory) {
    if (extraArgs.length == 0) {
      return Client.EVMExtraArgsV1({gasLimit: i_defaultTxGasLimit});
    }
    if (bytes4(extraArgs) != Client.EVM_EXTRA_ARGS_V1_TAG) revert InvalidExtraArgsTag();
    // EVMExtraArgsV1 originally included a second boolean (strict) field which we have deprecated entirely.
    // Clients may still send that version but it will be ignored.
    return abi.decode(extraArgs[4:], (Client.EVMExtraArgsV1));
  }

  /// @notice Validate the forwarded message with various checks.
  /// @dev This function can be called multiple times during a CCIPSend,
  /// only common user-driven mistakes are validated here to minimize duplicate validation cost.
  /// @param dataLength The length of the data field of the message.
  /// @param gasLimit The gasLimit set in message for destination execution.
  /// @param numberOfTokens The number of tokens to be sent.
  function _validateMessage(uint256 dataLength, uint256 gasLimit, uint256 numberOfTokens) internal view {
    // Check that payload is formed correctly
    uint256 maxDataBytes = uint256(s_dynamicConfig.maxDataBytes);
    if (dataLength > maxDataBytes) revert MessageTooLarge(maxDataBytes, dataLength);
    if (gasLimit > uint256(s_dynamicConfig.maxPerMsgGasLimit)) revert MessageGasLimitTooHigh();
    if (numberOfTokens > uint256(s_dynamicConfig.maxNumberOfTokensPerMsg)) revert UnsupportedNumberOfTokens();
  }

  // ================================================================
  // │                           Config                             │
  // ================================================================

  /// @notice Returns the static onRamp config.
  /// @dev RMN depends on this function, if changing, please notify the RMN maintainers.
  /// @return the configuration.
  function getStaticConfig() external view returns (StaticConfig memory) {
    return
      StaticConfig({
        linkToken: i_linkToken,
        chainSelector: i_chainSelector,
        destChainSelector: i_destChainSelector,
        defaultTxGasLimit: i_defaultTxGasLimit,
        maxNopFeesJuels: i_maxNopFeesJuels,
        prevOnRamp: i_prevOnRamp,
        armProxy: i_armProxy
      });
  }

  /// @notice Returns the dynamic onRamp config.
  /// @return dynamicConfig the configuration.
  function getDynamicConfig() external view returns (DynamicConfig memory dynamicConfig) {
    return s_dynamicConfig;
  }

  /// @notice Sets the dynamic configuration.
  /// @param dynamicConfig The configuration.
  function setDynamicConfig(DynamicConfig memory dynamicConfig) external onlyOwner {
    _setDynamicConfig(dynamicConfig);
  }

  /// @notice Internal version of setDynamicConfig to allow for reuse in the constructor.
  function _setDynamicConfig(DynamicConfig memory dynamicConfig) internal {
    // We permit router to be set to zero as a way to pause the contract.
    if (dynamicConfig.priceRegistry == address(0)) revert InvalidConfig();

    s_dynamicConfig = dynamicConfig;

    emit ConfigSet(
      StaticConfig({
        linkToken: i_linkToken,
        chainSelector: i_chainSelector,
        destChainSelector: i_destChainSelector,
        defaultTxGasLimit: i_defaultTxGasLimit,
        maxNopFeesJuels: i_maxNopFeesJuels,
        prevOnRamp: i_prevOnRamp,
        armProxy: i_armProxy
      }),
      dynamicConfig
    );
  }

  // ================================================================
  // │                      Tokens and pools                        │
  // ================================================================

  /// @inheritdoc IEVM2AnyOnRampClient
  function getSupportedTokens(uint64 /*destChainSelector*/) external view returns (address[] memory) {
    address[] memory sourceTokens = new address[](s_poolsBySourceToken.length());
    for (uint256 i = 0; i < sourceTokens.length; ++i) {
      (sourceTokens[i], ) = s_poolsBySourceToken.at(i);
    }
    return sourceTokens;
  }

  /// @inheritdoc IEVM2AnyOnRampClient
  function getPoolBySourceToken(uint64 /*destChainSelector*/, IERC20 sourceToken) public view returns (IPool) {
    if (!s_poolsBySourceToken.contains(address(sourceToken))) revert UnsupportedToken(sourceToken);
    return IPool(s_poolsBySourceToken.get(address(sourceToken)));
  }

  /// @inheritdoc IEVM2AnyOnRamp
  /// @dev This method can only be called by the owner of the contract.
  function applyPoolUpdates(
    Internal.PoolUpdate[] memory removes,
    Internal.PoolUpdate[] memory adds
  ) external onlyOwner {
    _applyPoolUpdates(removes, adds);
  }

  function _applyPoolUpdates(Internal.PoolUpdate[] memory removes, Internal.PoolUpdate[] memory adds) internal {
    for (uint256 i = 0; i < removes.length; ++i) {
      address token = removes[i].token;
      address pool = removes[i].pool;

      if (!s_poolsBySourceToken.contains(token)) revert PoolDoesNotExist(token);
      if (s_poolsBySourceToken.get(token) != pool) revert TokenPoolMismatch();

      if (s_poolsBySourceToken.remove(token)) {
        emit PoolRemoved(token, pool);
      }
    }

    for (uint256 i = 0; i < adds.length; ++i) {
      address token = adds[i].token;
      address pool = adds[i].pool;

      if (token == address(0) || pool == address(0)) revert InvalidTokenPoolConfig();
      if (token != address(IPool(pool).getToken())) revert TokenPoolMismatch();

      if (s_poolsBySourceToken.set(token, pool)) {
        emit PoolAdded(token, pool);
      } else {
        revert PoolAlreadyAdded();
      }
    }
  }

  // ================================================================
  // │                             Fees                             │
  // ================================================================

  /// @inheritdoc IEVM2AnyOnRampClient
  /// @dev getFee MUST revert if the feeToken is not listed in the fee token config, as the router assumes it does.
  /// @param destChainSelector The destination chain selector.
  /// @param message The message to get quote for.
  /// @return feeTokenAmount The amount of fee token needed for the fee, in smallest denomination of the fee token.
  function getFee(
    uint64 destChainSelector,
    Client.EVM2AnyMessage calldata message
  ) external view returns (uint256 feeTokenAmount) {
    if (destChainSelector != i_destChainSelector) revert InvalidChainSelector(destChainSelector);

    uint256 gasLimit = _fromBytes(message.extraArgs).gasLimit;
    // Validate the message with various checks
    _validateMessage(message.data.length, gasLimit, message.tokenAmounts.length);

    FeeTokenConfig memory feeTokenConfig = s_feeTokenConfig[message.feeToken];
    if (!feeTokenConfig.enabled) revert NotAFeeToken(message.feeToken);

    (uint224 feeTokenPrice, uint224 packedGasPrice) = IPriceRegistry(s_dynamicConfig.priceRegistry)
      .getTokenAndGasPrices(message.feeToken, destChainSelector);
    uint112 executionGasPrice = uint112(packedGasPrice);

    // Calculate premiumFee in USD with 18 decimals precision first.
    // If message-only and no token transfers, a flat network fee is charged.
    // If there are token transfers, premiumFee is calculated from token transfer fee.
    // If there are both token transfers and message, premiumFee is only calculated from token transfer fee.
    uint256 premiumFee = 0;
    uint32 tokenTransferGas = 0;
    uint32 tokenTransferBytesOverhead = 0;
    if (message.tokenAmounts.length > 0) {
      (premiumFee, tokenTransferGas, tokenTransferBytesOverhead) = _getTokenTransferCost(
        message.feeToken,
        feeTokenPrice,
        message.tokenAmounts
      );
    } else {
      // Convert USD cents with 2 decimals to 18 decimals.
      premiumFee = uint256(feeTokenConfig.networkFeeUSDCents) * 1e16;
    }

    // Apply a feeToken-specific multiplier with 18 decimals, raising the premiumFee to 36 decimals
    premiumFee = premiumFee * feeTokenConfig.premiumMultiplierWeiPerEth;

    // Calculate execution gas fee on destination chain in USD with 36 decimals.
    // We add the message gas limit, the overhead gas, the gas of passing message data to receiver, and token transfer gas together.
    // We then multiply this gas total with the gas multiplier and gas price, converting it into USD with 36 decimals.
    uint256 executionCost = executionGasPrice *
      ((gasLimit +
        s_dynamicConfig.destGasOverhead +
        (message.data.length * s_dynamicConfig.destGasPerPayloadByte) +
        tokenTransferGas) * feeTokenConfig.gasMultiplierWeiPerEth);

    // Calculate data availability cost in USD with 36 decimals. Data availability cost exists on rollups that need to post
    // transaction calldata onto another storage layer, e.g. Eth mainnet, incurring additional storage gas costs.
    uint256 dataAvailabilityCost = 0;
    // Only calculate data availability cost if data availability multiplier is non-zero.
    // The multiplier should be set to 0 if destination chain does not charge data availability cost.
    if (s_dynamicConfig.destDataAvailabilityMultiplierBps > 0) {
      // Parse the data availability gas price stored in the higher-order 112 bits of the encoded gas price.
      uint112 dataAvailabilityGasPrice = uint112(packedGasPrice >> Internal.GAS_PRICE_BITS);

      dataAvailabilityCost = _getDataAvailabilityCost(
        dataAvailabilityGasPrice,
        message.data.length,
        message.tokenAmounts.length,
        tokenTransferBytesOverhead
      );
    }

    // Calculate number of fee tokens to charge.
    // Total USD fee is in 36 decimals, feeTokenPrice is in 18 decimals USD for 1e18 smallest token denominations.
    // Result of the division is the number of smallest token denominations.
    return (premiumFee + executionCost + dataAvailabilityCost) / feeTokenPrice;
  }

  /// @notice Returns the estimated data availability cost of the message.
  /// @dev To save on gas, we use a single destGasPerDataAvailabilityByte value for both zero and non-zero bytes.
  /// @param dataAvailabilityGasPrice USD per data availability gas in 18 decimals.
  /// @param messageDataLength length of the data field in the message.
  /// @param numberOfTokens number of distinct token transfers in the message.
  /// @param tokenTransferBytesOverhead additional token transfer data passed to destination, e.g. USDC attestation.
  /// @return dataAvailabilityCostUSD36Decimal total data availability cost in USD with 36 decimals.
  function _getDataAvailabilityCost(
    uint112 dataAvailabilityGasPrice,
    uint256 messageDataLength,
    uint256 numberOfTokens,
    uint32 tokenTransferBytesOverhead
  ) internal view returns (uint256 dataAvailabilityCostUSD36Decimal) {
    // dataAvailabilityLengthBytes sums up byte lengths of fixed message fields and dynamic message fields.
    // Fixed message fields do account for the offset and length slot of the dynamic fields.
    uint256 dataAvailabilityLengthBytes = Internal.MESSAGE_FIXED_BYTES +
      messageDataLength +
      (numberOfTokens * Internal.MESSAGE_FIXED_BYTES_PER_TOKEN) +
      tokenTransferBytesOverhead;

    // destDataAvailabilityOverheadGas is a separate config value for flexibility to be updated independently of message cost.
    // Its value is determined by CCIP lane implementation, e.g. the overhead data posted for OCR.
    uint256 dataAvailabilityGas = (dataAvailabilityLengthBytes * s_dynamicConfig.destGasPerDataAvailabilityByte) +
      s_dynamicConfig.destDataAvailabilityOverheadGas;

    // dataAvailabilityGasPrice is in 18 decimals, destDataAvailabilityMultiplierBps is in 4 decimals
    // We pad 14 decimals to bring the result to 36 decimals, in line with token bps and execution fee.
    return
      ((dataAvailabilityGas * dataAvailabilityGasPrice) * s_dynamicConfig.destDataAvailabilityMultiplierBps) * 1e14;
  }

  /// @notice Returns the token transfer cost parameters.
  /// A basis point fee is calculated from the USD value of each token transfer.
  /// For each individual transfer, this fee is between [minFeeUSD, maxFeeUSD].
  /// Total transfer fee is the sum of each individual token transfer fee.
  /// @dev Assumes that tokenAmounts are validated to be listed tokens elsewhere.
  /// @dev Splitting one token transfer into multiple transfers is discouraged,
  /// as it will result in a transferFee equal or greater than the same amount aggregated/de-duped.
  /// @param feeToken address of the feeToken.
  /// @param feeTokenPrice price of feeToken in USD with 18 decimals.
  /// @param tokenAmounts token transfers in the message.
  /// @return tokenTransferFeeUSDWei total token transfer bps fee in USD with 18 decimals.
  /// @return tokenTransferGas total execution gas of the token transfers.
  /// @return tokenTransferBytesOverhead additional token transfer data passed to destination, e.g. USDC attestation.
  function _getTokenTransferCost(
    address feeToken,
    uint224 feeTokenPrice,
    Client.EVMTokenAmount[] calldata tokenAmounts
  ) internal view returns (uint256 tokenTransferFeeUSDWei, uint32 tokenTransferGas, uint32 tokenTransferBytesOverhead) {
    uint256 numberOfTokens = tokenAmounts.length;

    for (uint256 i = 0; i < numberOfTokens; ++i) {
      Client.EVMTokenAmount memory tokenAmount = tokenAmounts[i];
      TokenTransferFeeConfig memory transferFeeConfig = s_tokenTransferFeeConfig[tokenAmount.token];

      // Validate if the token is supported, do not calculate fee for unsupported tokens.
      if (!s_poolsBySourceToken.contains(tokenAmount.token)) revert UnsupportedToken(IERC20(tokenAmount.token));

      uint256 bpsFeeUSDWei = 0;
      // Only calculate bps fee if ratio is greater than 0. Ratio of 0 means no bps fee for a token.
      // Useful for when the PriceRegistry cannot return a valid price for the token.
      if (transferFeeConfig.deciBps > 0) {
        uint224 tokenPrice = 0;
        if (tokenAmount.token != feeToken) {
          tokenPrice = IPriceRegistry(s_dynamicConfig.priceRegistry).getValidatedTokenPrice(tokenAmount.token);
        } else {
          tokenPrice = feeTokenPrice;
        }

        // Calculate token transfer value, then apply fee ratio
        // ratio represents multiples of 0.1bps, or 1e-5
        bpsFeeUSDWei = (tokenPrice._calcUSDValueFromTokenAmount(tokenAmount.amount) * transferFeeConfig.deciBps) / 1e5;
      }

      tokenTransferGas += transferFeeConfig.destGasOverhead;
      tokenTransferBytesOverhead += transferFeeConfig.destBytesOverhead;

      // Bps fees should be kept within range of [minFeeUSD, maxFeeUSD].
      // Convert USD values with 2 decimals to 18 decimals.
      uint256 minFeeUSDWei = uint256(transferFeeConfig.minFeeUSDCents) * 1e16;
      if (bpsFeeUSDWei < minFeeUSDWei) {
        tokenTransferFeeUSDWei += minFeeUSDWei;
        continue;
      }

      uint256 maxFeeUSDWei = uint256(transferFeeConfig.maxFeeUSDCents) * 1e16;
      if (bpsFeeUSDWei > maxFeeUSDWei) {
        tokenTransferFeeUSDWei += maxFeeUSDWei;
        continue;
      }

      tokenTransferFeeUSDWei += bpsFeeUSDWei;
    }

    return (tokenTransferFeeUSDWei, tokenTransferGas, tokenTransferBytesOverhead);
  }

  /// @notice Gets the fee configuration for a token
  /// @param token The token to get the fee configuration for
  /// @return feeTokenConfig FeeTokenConfig struct
  function getFeeTokenConfig(address token) external view returns (FeeTokenConfig memory feeTokenConfig) {
    return s_feeTokenConfig[token];
  }

  /// @notice Sets the fee configuration for a token
  /// @param feeTokenConfigArgs Array of FeeTokenConfigArgs structs.
  function setFeeTokenConfig(FeeTokenConfigArgs[] memory feeTokenConfigArgs) external onlyOwnerOrAdmin {
    _setFeeTokenConfig(feeTokenConfigArgs);
  }

  /// @dev Set the fee config
  /// @param feeTokenConfigArgs The fee token configs.
  function _setFeeTokenConfig(FeeTokenConfigArgs[] memory feeTokenConfigArgs) internal {
    for (uint256 i = 0; i < feeTokenConfigArgs.length; ++i) {
      FeeTokenConfigArgs memory configArg = feeTokenConfigArgs[i];

      s_feeTokenConfig[configArg.token] = FeeTokenConfig({
        networkFeeUSDCents: configArg.networkFeeUSDCents,
        gasMultiplierWeiPerEth: configArg.gasMultiplierWeiPerEth,
        premiumMultiplierWeiPerEth: configArg.premiumMultiplierWeiPerEth,
        enabled: configArg.enabled
      });
    }
    emit FeeConfigSet(feeTokenConfigArgs);
  }

  /// @notice Gets the transfer fee config for a given token.
  function getTokenTransferFeeConfig(
    address token
  ) external view returns (TokenTransferFeeConfig memory tokenTransferFeeConfig) {
    return s_tokenTransferFeeConfig[token];
  }

  /// @notice Sets the transfer fee config.
  /// @dev only callable by the owner or admin.
  function setTokenTransferFeeConfig(
    TokenTransferFeeConfigArgs[] memory tokenTransferFeeConfigArgs
  ) external onlyOwnerOrAdmin {
    _setTokenTransferFeeConfig(tokenTransferFeeConfigArgs);
  }

  /// @notice internal helper to set the token transfer fee config.
  function _setTokenTransferFeeConfig(TokenTransferFeeConfigArgs[] memory tokenTransferFeeConfigArgs) internal {
    for (uint256 i = 0; i < tokenTransferFeeConfigArgs.length; ++i) {
      TokenTransferFeeConfigArgs memory configArg = tokenTransferFeeConfigArgs[i];

      s_tokenTransferFeeConfig[configArg.token] = TokenTransferFeeConfig({
        minFeeUSDCents: configArg.minFeeUSDCents,
        maxFeeUSDCents: configArg.maxFeeUSDCents,
        deciBps: configArg.deciBps,
        destGasOverhead: configArg.destGasOverhead,
        destBytesOverhead: configArg.destBytesOverhead
      });
    }
    emit TokenTransferFeeConfigSet(tokenTransferFeeConfigArgs);
  }

  // ================================================================
  // │                         NOP payments                         │
  // ================================================================

  /// @notice Get the total amount of fees to be paid to the Nops (in LINK)
  /// @return totalNopFees
  function getNopFeesJuels() external view returns (uint96) {
    return s_nopFeesJuels;
  }

  /// @notice Gets the Nops and their weights
  /// @return nopsAndWeights Array of NopAndWeight structs
  /// @return weightsTotal The sum weight of all Nops
  function getNops() external view returns (NopAndWeight[] memory nopsAndWeights, uint256 weightsTotal) {
    uint256 length = s_nops.length();
    nopsAndWeights = new NopAndWeight[](length);
    for (uint256 i = 0; i < length; ++i) {
      (address nopAddress, uint256 nopWeight) = s_nops.at(i);
      nopsAndWeights[i] = NopAndWeight({nop: nopAddress, weight: uint16(nopWeight)});
    }
    weightsTotal = s_nopWeightsTotal;
    return (nopsAndWeights, weightsTotal);
  }

  /// @notice Sets the Nops and their weights
  /// @param nopsAndWeights Array of NopAndWeight structs
  function setNops(NopAndWeight[] calldata nopsAndWeights) external onlyOwnerOrAdmin {
    _setNops(nopsAndWeights);
  }

  /// @param nopsAndWeights New set of nops and weights
  /// @dev Clears existing nops, sets new nops and weights
  /// @dev We permit fees to accrue before nops are configured, in which case
  /// they will go to the first set of configured nops.
  function _setNops(NopAndWeight[] memory nopsAndWeights) internal {
    uint256 numberOfNops = nopsAndWeights.length;
    if (numberOfNops > MAX_NUMBER_OF_NOPS) revert TooManyNops();

    // Make sure all nops have been paid before removing nops
    // We only have to pay when there are nops and there is enough
    // outstanding NOP balance to trigger a payment.
    if (s_nopWeightsTotal > 0 && s_nopFeesJuels >= s_nopWeightsTotal) {
      payNops();
    }

    // Remove all previous nops, move from end to start to avoid shifting
    for (uint256 i = s_nops.length(); i > 0; --i) {
      (address nop, ) = s_nops.at(i - 1);
      s_nops.remove(nop);
    }

    // Add new
    uint32 nopWeightsTotal = 0;
    // nopWeightsTotal is bounded by the MAX_NUMBER_OF_NOPS and the weight of
    // a single nop being of type uint16. This ensures nopWeightsTotal will
    // always fit into the uint32 type.
    for (uint256 i = 0; i < numberOfNops; ++i) {
      // Make sure the LINK token is not a nop because the link token doesn't allow
      // self transfers. If set as nop, payNops would always revert. Since setNops
      // calls payNops, we can never remove the LINK token as a nop.
      address nop = nopsAndWeights[i].nop;
      uint16 weight = nopsAndWeights[i].weight;
      if (nop == i_linkToken || nop == address(0)) revert InvalidNopAddress(nop);
      s_nops.set(nop, weight);
      nopWeightsTotal += weight;
    }
    s_nopWeightsTotal = nopWeightsTotal;
    emit NopsSet(nopWeightsTotal, nopsAndWeights);
  }

  /// @notice Pays the Node Ops their outstanding balances.
  /// @dev some balance can remain after payments are done. This is at most the sum
  /// of the weight of all nops. Since nop weights are uint16s and we can have at
  /// most MAX_NUMBER_OF_NOPS NOPs, the highest possible value is 2**22 or 0.04 gjuels.
  function payNops() public onlyOwnerOrAdminOrNop {
    uint256 weightsTotal = s_nopWeightsTotal;
    if (weightsTotal == 0) revert NoNopsToPay();

    uint96 totalFeesToPay = s_nopFeesJuels;
    if (totalFeesToPay < weightsTotal) revert NoFeesToPay();
    if (_linkLeftAfterNopFees() < 0) revert InsufficientBalance();

    uint96 fundsLeft = totalFeesToPay;
    uint256 numberOfNops = s_nops.length();
    for (uint256 i = 0; i < numberOfNops; ++i) {
      (address nop, uint256 weight) = s_nops.at(i);
      // amount can never be higher than totalFeesToPay so the cast to uint96 is safe
      uint96 amount = uint96((totalFeesToPay * weight) / weightsTotal);
      fundsLeft -= amount;
      IERC20(i_linkToken).safeTransfer(nop, amount);
      emit NopPaid(nop, amount);
    }
    // Some funds can remain, since this is an incredibly small
    // amount we consider this OK.
    s_nopFeesJuels = fundsLeft;
  }

  /// @notice Allows the owner to withdraw any ERC20 token that is not the fee token
  /// @param feeToken The token to withdraw
  /// @param to The address to send the tokens to
  function withdrawNonLinkFees(address feeToken, address to) external onlyOwnerOrAdmin {
    if (feeToken == i_linkToken || to == address(0)) revert InvalidWithdrawParams();

    // We require the link balance to be settled before allowing withdrawal
    // of non-link fees.
    if (_linkLeftAfterNopFees() < 0) revert LinkBalanceNotSettled();

    IERC20(feeToken).safeTransfer(to, IERC20(feeToken).balanceOf(address(this)));
  }

  // ================================================================
  // │                        Link monitoring                       │
  // ================================================================

  /// @notice Calculate remaining LINK balance after paying nops
  /// @return balance if nops were to be paid
  function _linkLeftAfterNopFees() private view returns (int256) {
    // Since LINK caps at uint96, casting to int256 is safe
    return int256(IERC20(i_linkToken).balanceOf(address(this))) - int256(uint256(s_nopFeesJuels));
  }

  /// @notice Allow keeper to monitor funds available for paying nops
  function linkAvailableForPayment() external view returns (int256) {
    return _linkLeftAfterNopFees();
  }

  // ================================================================
  // │                        Access and ARM                        │
  // ================================================================

  /// @dev Require that the sender is the owner or the fee admin or a nop
  modifier onlyOwnerOrAdminOrNop() {
    if (msg.sender != owner() && msg.sender != s_admin && !s_nops.contains(msg.sender))
      revert OnlyCallableByOwnerOrAdminOrNop();
    _;
  }

  /// @dev Require that the sender is the owner or the fee admin
  modifier onlyOwnerOrAdmin() {
    if (msg.sender != owner() && msg.sender != s_admin) revert OnlyCallableByOwnerOrAdmin();
    _;
  }

  /// @notice Ensure that the ARM has not emitted a bad signal, and that the latest heartbeat is not stale.
  modifier whenHealthy() {
    if (IARM(i_armProxy).isCursed()) revert BadARMSignal();
    _;
  }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface ITypeAndVersion {
  function typeAndVersion() external pure returns (string memory);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import {IERC20} from "../../../vendor/openzeppelin-solidity/v4.8.0/contracts/token/ERC20/IERC20.sol";

// Shared public interface for multiple pool types.
// Each pool type handles a different child token model (lock/unlock, mint/burn.)
interface IPool {
  /// @notice Lock tokens into the pool or burn the tokens.
  /// @param originalSender Original sender of the tokens.
  /// @param receiver Receiver of the tokens on destination chain.
  /// @param amount Amount to lock or burn.
  /// @param destChainSelector Destination chain Id.
  /// @param extraArgs Additional data passed in by sender for lockOrBurn processing
  /// in custom pools on source chain.
  /// @return retData Optional field that contains bytes. Unused for now but already
  /// implemented to allow future upgrades while preserving the interface.
  function lockOrBurn(
    address originalSender,
    bytes calldata receiver,
    uint256 amount,
    uint64 destChainSelector,
    bytes calldata extraArgs
  ) external returns (bytes memory);

  /// @notice Releases or mints tokens to the receiver address.
  /// @param originalSender Original sender of the tokens.
  /// @param receiver Receiver of the tokens.
  /// @param amount Amount to release or mint.
  /// @param sourceChainSelector Source chain Id.
  /// @param extraData Additional data supplied offchain for releaseOrMint processing in
  /// custom pools on dest chain. This could be an attestation that was retrieved through a
  /// third party API.
  /// @dev offchainData can come from any untrusted source.
  function releaseOrMint(
    bytes memory originalSender,
    address receiver,
    uint256 amount,
    uint64 sourceChainSelector,
    bytes memory extraData
  ) external;

  /// @notice Gets the IERC20 token that this pool can lock or burn.
  /// @return token The IERC20 token representation.
  function getToken() external view returns (IERC20 token);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

/// @notice This interface contains the only ARM-related functions that might be used on-chain by other CCIP contracts.
interface IARM {
  /// @notice A Merkle root tagged with the address of the commit store contract it is destined for.
  struct TaggedRoot {
    address commitStore;
    bytes32 root;
  }

  /// @notice Callers MUST NOT cache the return value as a blessed tagged root could become unblessed.
  function isBlessed(TaggedRoot calldata taggedRoot) external view returns (bool);

  /// @notice When the ARM is "cursed", CCIP pauses until the curse is lifted.
  function isCursed() external view returns (bool);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import {Internal} from "../libraries/Internal.sol";

interface IPriceRegistry {
  /// @notice Update the price for given tokens and gas prices for given chains.
  /// @param priceUpdates The price updates to apply.
  function updatePrices(Internal.PriceUpdates memory priceUpdates) external;

  /// @notice Get the `tokenPrice` for a given token.
  /// @param token The token to get the price for.
  /// @return tokenPrice The tokenPrice for the given token.
  function getTokenPrice(address token) external view returns (Internal.TimestampedPackedUint224 memory);

  /// @notice Get the `tokenPrice` for a given token, checks if the price is valid.
  /// @param token The token to get the price for.
  /// @return tokenPrice The tokenPrice for the given token if it exists and is valid.
  function getValidatedTokenPrice(address token) external view returns (uint224);

  /// @notice Get the `tokenPrice` for an array of tokens.
  /// @param tokens The tokens to get prices for.
  /// @return tokenPrices The tokenPrices for the given tokens.
  function getTokenPrices(address[] calldata tokens) external view returns (Internal.TimestampedPackedUint224[] memory);

  /// @notice Get an encoded `gasPrice` for a given destination chain ID.
  /// The 224-bit result encodes necessary gas price components.
  /// On L1 chains like Ethereum or Avax, the only component is the gas price.
  /// On Optimistic Rollups, there are two components - the L2 gas price, and L1 base fee for data availability.
  /// On future chains, there could be more or differing price components.
  /// PriceRegistry does not contain chain-specific logic to parse destination chain price components.
  /// @param destChainSelector The destination chain to get the price for.
  /// @return gasPrice The encoded gasPrice for the given destination chain ID.
  function getDestinationChainGasPrice(
    uint64 destChainSelector
  ) external view returns (Internal.TimestampedPackedUint224 memory);

  /// @notice Gets the fee token price and the gas price, both denominated in dollars.
  /// @param token The source token to get the price for.
  /// @param destChainSelector The destination chain to get the gas price for.
  /// @return tokenPrice The price of the feeToken in 1e18 dollars per base unit.
  /// @return gasPrice The price of gas in 1e18 dollars per base unit.
  function getTokenAndGasPrices(
    address token,
    uint64 destChainSelector
  ) external view returns (uint224 tokenPrice, uint224 gasPrice);

  /// @notice Convert a given token amount to target token amount.
  /// @param fromToken The given token address.
  /// @param fromTokenAmount The given token amount.
  /// @param toToken The target token address.
  /// @return toTokenAmount The target token amount.
  function convertTokenAmount(
    address fromToken,
    uint256 fromTokenAmount,
    address toToken
  ) external view returns (uint256 toTokenAmount);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import {IEVM2AnyOnRampClient} from "./IEVM2AnyOnRampClient.sol";

import {Internal} from "../libraries/Internal.sol";

interface IEVM2AnyOnRamp is IEVM2AnyOnRampClient {
  /// @notice Gets the next sequence number to be used in the onRamp
  /// @return the next sequence number to be used
  function getExpectedNextSequenceNumber() external view returns (uint64);

  /// @notice Get the next nonce for a given sender
  /// @param sender The sender to get the nonce for
  /// @return nonce The next nonce for the sender
  function getSenderNonce(address sender) external view returns (uint64 nonce);

  /// @notice Adds and removed token pools.
  /// @param removes The tokens and pools to be removed
  /// @param adds The tokens and pools to be added.
  function applyPoolUpdates(Internal.PoolUpdate[] memory removes, Internal.PoolUpdate[] memory adds) external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import {IPool} from "./pools/IPool.sol";

import {Client} from "../libraries/Client.sol";

import {IERC20} from "../../vendor/openzeppelin-solidity/v4.8.0/contracts/token/ERC20/IERC20.sol";

interface IEVM2AnyOnRampClient {
  /// @notice Get the fee for a given ccip message
  /// @param destChainSelector The destination chain selector
  /// @param message The message to calculate the cost for
  /// @return fee The calculated fee
  function getFee(uint64 destChainSelector, Client.EVM2AnyMessage calldata message) external view returns (uint256 fee);

  /// @notice Get the pool for a specific token
  /// @param destChainSelector The destination chain selector
  /// @param sourceToken The source chain token to get the pool for
  /// @return pool Token pool
  function getPoolBySourceToken(uint64 destChainSelector, IERC20 sourceToken) external view returns (IPool);

  /// @notice Gets a list of all supported source chain tokens.
  /// @param destChainSelector The destination chain selector
  /// @return tokens The addresses of all tokens that this onRamp supports the given destination chain
  function getSupportedTokens(uint64 destChainSelector) external view returns (address[] memory tokens);

  /// @notice Send a message to the remote chain
  /// @dev only callable by the Router
  /// @dev approve() must have already been called on the token using the this ramp address as the spender.
  /// @dev if the contract is paused, this function will revert.
  /// @param destChainSelector The destination chain selector
  /// @param message Message struct to send
  /// @param feeTokenAmount Amount of fee tokens for payment
  /// @param originalSender The original initiator of the CCIP request
  function forwardFromRouter(
    uint64 destChainSelector,
    Client.EVM2AnyMessage memory message,
    uint256 feeTokenAmount,
    address originalSender
  ) external returns (bytes32);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

/// @notice Implement this contract so that a keeper-compatible contract can monitor
/// and fund the implementation contract with LINK if it falls below a defined threshold.
interface ILinkAvailable {
  function linkAvailableForPayment() external view returns (int256 availableBalance);
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.8.19;

import {IPriceRegistry} from "./interfaces/IPriceRegistry.sol";

import {OwnerIsCreator} from "./../shared/access/OwnerIsCreator.sol";
import {Client} from "./libraries/Client.sol";
import {RateLimiter} from "./libraries/RateLimiter.sol";
import {USDPriceWith18Decimals} from "./libraries/USDPriceWith18Decimals.sol";

/// @notice The aggregate rate limiter is a wrapper of the token bucket rate limiter
/// which permits rate limiting based on the aggregate value of a group of
/// token transfers, using a price registry to convert to a numeraire asset (e.g. USD).
contract AggregateRateLimiter is OwnerIsCreator {
  using RateLimiter for RateLimiter.TokenBucket;
  using USDPriceWith18Decimals for uint224;

  error PriceNotFoundForToken(address token);

  event AdminSet(address newAdmin);

  // The address of the token limit admin that has the same permissions as the owner.
  address internal s_admin;

  // The token bucket object that contains the bucket state.
  RateLimiter.TokenBucket private s_rateLimiter;

  /// @param config The RateLimiter.Config containing the capacity and refill rate
  /// of the bucket, plus the admin address.
  constructor(RateLimiter.Config memory config) {
    s_rateLimiter = RateLimiter.TokenBucket({
      rate: config.rate,
      capacity: config.capacity,
      tokens: config.capacity,
      lastUpdated: uint32(block.timestamp),
      isEnabled: config.isEnabled
    });
  }

  /// @notice Consumes value from the rate limiter bucket based on the
  /// token value given. First, calculate the prices
  function _rateLimitValue(Client.EVMTokenAmount[] memory tokenAmounts, IPriceRegistry priceRegistry) internal {
    uint256 numberOfTokens = tokenAmounts.length;

    uint256 value = 0;
    for (uint256 i = 0; i < numberOfTokens; ++i) {
      // not fetching validated price, as price staleness is not important for value-based rate limiting
      // we only need to verify price is not 0
      uint224 pricePerToken = priceRegistry.getTokenPrice(tokenAmounts[i].token).value;
      if (pricePerToken == 0) revert PriceNotFoundForToken(tokenAmounts[i].token);
      value += pricePerToken._calcUSDValueFromTokenAmount(tokenAmounts[i].amount);
    }

    s_rateLimiter._consume(value, address(0));
  }

  /// @notice Gets the token bucket with its values for the block it was requested at.
  /// @return The token bucket.
  function currentRateLimiterState() external view returns (RateLimiter.TokenBucket memory) {
    return s_rateLimiter._currentTokenBucketState();
  }

  /// @notice Sets the rate limited config.
  /// @param config The new rate limiter config.
  /// @dev should only be callable by the owner or token limit admin.
  function setRateLimiterConfig(RateLimiter.Config memory config) external onlyAdminOrOwner {
    s_rateLimiter._setTokenBucketConfig(config);
  }

  // ================================================================
  // │                           Access                             │
  // ================================================================

  /// @notice Gets the token limit admin address.
  /// @return the token limit admin address.
  function getTokenLimitAdmin() external view returns (address) {
    return s_admin;
  }

  /// @notice Sets the token limit admin address.
  /// @param newAdmin the address of the new admin.
  /// @dev setting this to address(0) indicates there is no active admin.
  function setAdmin(address newAdmin) external onlyAdminOrOwner {
    s_admin = newAdmin;
    emit AdminSet(newAdmin);
  }

  /// @notice a modifier that allows the owner or the s_tokenLimitAdmin call the functions
  /// it is applied to.
  modifier onlyAdminOrOwner() {
    if (msg.sender != owner() && msg.sender != s_admin) revert RateLimiter.OnlyCallableByAdminOrOwner();
    _;
  }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

// End consumer library.
library Client {
  /// @dev RMN depends on this struct, if changing, please notify the RMN maintainers.
  struct EVMTokenAmount {
    address token; // token address on the local chain.
    uint256 amount; // Amount of tokens.
  }

  struct Any2EVMMessage {
    bytes32 messageId; // MessageId corresponding to ccipSend on source.
    uint64 sourceChainSelector; // Source chain selector.
    bytes sender; // abi.decode(sender) if coming from an EVM chain.
    bytes data; // payload sent in original message.
    EVMTokenAmount[] destTokenAmounts; // Tokens and their amounts in their destination chain representation.
  }

  // If extraArgs is empty bytes, the default is 200k gas limit.
  struct EVM2AnyMessage {
    bytes receiver; // abi.encode(receiver address) for dest EVM chains
    bytes data; // Data payload
    EVMTokenAmount[] tokenAmounts; // Token transfers
    address feeToken; // Address of feeToken. address(0) means you will send msg.value.
    bytes extraArgs; // Populate this with _argsToBytes(EVMExtraArgsV1)
  }

  // bytes4(keccak256("CCIP EVMExtraArgsV1"));
  bytes4 public constant EVM_EXTRA_ARGS_V1_TAG = 0x97a657c9;
  struct EVMExtraArgsV1 {
    uint256 gasLimit;
  }

  function _argsToBytes(EVMExtraArgsV1 memory extraArgs) internal pure returns (bytes memory bts) {
    return abi.encodeWithSelector(EVM_EXTRA_ARGS_V1_TAG, extraArgs);
  }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import {Client} from "./Client.sol";
import {MerkleMultiProof} from "../libraries/MerkleMultiProof.sol";

// Library for CCIP internal definitions common to multiple contracts.
library Internal {
  /// @dev The minimum amount of gas to perform the call with exact gas.
  /// We include this in the offramp so that we can redeploy to adjust it
  /// should a hardfork change the gas costs of relevant opcodes in callWithExactGas.
  uint16 internal constant GAS_FOR_CALL_EXACT_CHECK = 5_000;
  // @dev We limit return data to a selector plus 4 words. This is to avoid
  // malicious contracts from returning large amounts of data and causing
  // repeated out-of-gas scenarios.
  uint16 internal constant MAX_RET_BYTES = 4 + 4 * 32;

  /// @notice A collection of token price and gas price updates.
  /// @dev RMN depends on this struct, if changing, please notify the RMN maintainers.
  struct PriceUpdates {
    TokenPriceUpdate[] tokenPriceUpdates;
    GasPriceUpdate[] gasPriceUpdates;
  }

  /// @notice Token price in USD.
  /// @dev RMN depends on this struct, if changing, please notify the RMN maintainers.
  struct TokenPriceUpdate {
    address sourceToken; // Source token
    uint224 usdPerToken; // 1e18 USD per smallest unit of token
  }

  /// @notice Gas price for a given chain in USD, its value may contain tightly packed fields.
  /// @dev RMN depends on this struct, if changing, please notify the RMN maintainers.
  struct GasPriceUpdate {
    uint64 destChainSelector; // Destination chain selector
    uint224 usdPerUnitGas; // 1e18 USD per smallest unit (e.g. wei) of destination chain gas
  }

  /// @notice A timestamped uint224 value that can contain several tightly packed fields.
  struct TimestampedPackedUint224 {
    uint224 value; // ───────╮ Value in uint224, packed.
    uint32 timestamp; // ────╯ Timestamp of the most recent price update.
  }

  /// @dev Gas price is stored in 112-bit unsigned int. uint224 can pack 2 prices.
  /// When packing L1 and L2 gas prices, L1 gas price is left-shifted to the higher-order bits.
  /// Using uint8 type, which cannot be higher than other bit shift operands, to avoid shift operand type warning.
  uint8 public constant GAS_PRICE_BITS = 112;

  struct PoolUpdate {
    address token; // The IERC20 token address
    address pool; // The token pool address
  }

  /// @notice Report that is submitted by the execution DON at the execution phase.
  /// @dev RMN depends on this struct, if changing, please notify the RMN maintainers.
  struct ExecutionReport {
    EVM2EVMMessage[] messages;
    // Contains a bytes array for each message, each inner bytes array contains bytes per transferred token
    bytes[][] offchainTokenData;
    bytes32[] proofs;
    uint256 proofFlagBits;
  }

  /// @notice The cross chain message that gets committed to EVM chains.
  /// @dev RMN depends on this struct, if changing, please notify the RMN maintainers.
  struct EVM2EVMMessage {
    uint64 sourceChainSelector; // ─────────╮ the chain selector of the source chain, note: not chainId
    address sender; // ─────────────────────╯ sender address on the source chain
    address receiver; // ───────────────────╮ receiver address on the destination chain
    uint64 sequenceNumber; // ──────────────╯ sequence number, not unique across lanes
    uint256 gasLimit; //                      user supplied maximum gas amount available for dest chain execution
    bool strict; // ────────────────────────╮ DEPRECATED
    uint64 nonce; //                        │ nonce for this lane for this sender, not unique across senders/lanes
    address feeToken; // ───────────────────╯ fee token
    uint256 feeTokenAmount; //                fee token amount
    bytes data; //                            arbitrary data payload supplied by the message sender
    Client.EVMTokenAmount[] tokenAmounts; //  array of tokens and amounts to transfer
    bytes[] sourceTokenData; //               array of token pool return values, one per token
    bytes32 messageId; //                     a hash of the message data
  }

  /// @dev EVM2EVMMessage struct has 13 fields, including 3 variable arrays.
  /// Each variable array takes 1 more slot to store its length.
  /// When abi encoded, excluding array contents,
  /// EVM2EVMMessage takes up a fixed number of 16 lots, 32 bytes each.
  /// For structs that contain arrays, 1 more slot is added to the front, reaching a total of 17.
  uint256 public constant MESSAGE_FIXED_BYTES = 32 * 17;

  /// @dev Each token transfer adds 1 EVMTokenAmount and 1 bytes.
  /// When abiEncoded, each EVMTokenAmount takes 2 slots, each bytes takes 2 slots, excl bytes contents
  uint256 public constant MESSAGE_FIXED_BYTES_PER_TOKEN = 32 * 4;

  function _toAny2EVMMessage(
    EVM2EVMMessage memory original,
    Client.EVMTokenAmount[] memory destTokenAmounts
  ) internal pure returns (Client.Any2EVMMessage memory message) {
    message = Client.Any2EVMMessage({
      messageId: original.messageId,
      sourceChainSelector: original.sourceChainSelector,
      sender: abi.encode(original.sender),
      data: original.data,
      destTokenAmounts: destTokenAmounts
    });
  }

  bytes32 internal constant EVM_2_EVM_MESSAGE_HASH = keccak256("EVM2EVMMessageHashV2");

  function _hash(EVM2EVMMessage memory original, bytes32 metadataHash) internal pure returns (bytes32) {
    // Fixed-size message fields are included in nested hash to reduce stack pressure.
    // This hashing scheme is also used by RMN. If changing it, please notify the RMN maintainers.
    return
      keccak256(
        abi.encode(
          MerkleMultiProof.LEAF_DOMAIN_SEPARATOR,
          metadataHash,
          keccak256(
            abi.encode(
              original.sender,
              original.receiver,
              original.sequenceNumber,
              original.gasLimit,
              original.strict,
              original.nonce,
              original.feeToken,
              original.feeTokenAmount
            )
          ),
          keccak256(original.data),
          keccak256(abi.encode(original.tokenAmounts)),
          keccak256(abi.encode(original.sourceTokenData))
        )
      );
  }

  /// @notice Enum listing the possible message execution states within
  /// the offRamp contract.
  /// UNTOUCHED never executed
  /// IN_PROGRESS currently being executed, used a replay protection
  /// SUCCESS successfully executed. End state
  /// FAILURE unsuccessfully executed, manual execution is now enabled.
  /// @dev RMN depends on this enum, if changing, please notify the RMN maintainers.
  enum MessageExecutionState {
    UNTOUCHED,
    IN_PROGRESS,
    SUCCESS,
    FAILURE
  }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.0;

/// @notice Implements Token Bucket rate limiting.
/// @dev uint128 is safe for rate limiter state.
/// For USD value rate limiting, it can adequately store USD value in 18 decimals.
/// For ERC20 token amount rate limiting, all tokens that will be listed will have at most
/// a supply of uint128.max tokens, and it will therefore not overflow the bucket.
/// In exceptional scenarios where tokens consumed may be larger than uint128,
/// e.g. compromised issuer, an enabled RateLimiter will check and revert.
library RateLimiter {
  error BucketOverfilled();
  error OnlyCallableByAdminOrOwner();
  error TokenMaxCapacityExceeded(uint256 capacity, uint256 requested, address tokenAddress);
  error TokenRateLimitReached(uint256 minWaitInSeconds, uint256 available, address tokenAddress);
  error AggregateValueMaxCapacityExceeded(uint256 capacity, uint256 requested);
  error AggregateValueRateLimitReached(uint256 minWaitInSeconds, uint256 available);

  event TokensConsumed(uint256 tokens);
  event ConfigChanged(Config config);

  struct TokenBucket {
    uint128 tokens; // ──────╮ Current number of tokens that are in the bucket.
    uint32 lastUpdated; //   │ Timestamp in seconds of the last token refill, good for 100+ years.
    bool isEnabled; // ──────╯ Indication whether the rate limiting is enabled or not
    uint128 capacity; // ────╮ Maximum number of tokens that can be in the bucket.
    uint128 rate; // ────────╯ Number of tokens per second that the bucket is refilled.
  }

  struct Config {
    bool isEnabled; // Indication whether the rate limiting should be enabled
    uint128 capacity; // ────╮ Specifies the capacity of the rate limiter
    uint128 rate; //  ───────╯ Specifies the rate of the rate limiter
  }

  /// @notice _consume removes the given tokens from the pool, lowering the
  /// rate tokens allowed to be consumed for subsequent calls.
  /// @param requestTokens The total tokens to be consumed from the bucket.
  /// @param tokenAddress The token to consume capacity for, use 0x0 to indicate aggregate value capacity.
  /// @dev Reverts when requestTokens exceeds bucket capacity or available tokens in the bucket
  /// @dev emits removal of requestTokens if requestTokens is > 0
  function _consume(TokenBucket storage s_bucket, uint256 requestTokens, address tokenAddress) internal {
    // If there is no value to remove or rate limiting is turned off, skip this step to reduce gas usage
    if (!s_bucket.isEnabled || requestTokens == 0) {
      return;
    }

    uint256 tokens = s_bucket.tokens;
    uint256 capacity = s_bucket.capacity;
    uint256 timeDiff = block.timestamp - s_bucket.lastUpdated;

    if (timeDiff != 0) {
      if (tokens > capacity) revert BucketOverfilled();

      // Refill tokens when arriving at a new block time
      tokens = _calculateRefill(capacity, tokens, timeDiff, s_bucket.rate);

      s_bucket.lastUpdated = uint32(block.timestamp);
    }

    if (capacity < requestTokens) {
      // Token address 0 indicates consuming aggregate value rate limit capacity.
      if (tokenAddress == address(0)) revert AggregateValueMaxCapacityExceeded(capacity, requestTokens);
      revert TokenMaxCapacityExceeded(capacity, requestTokens, tokenAddress);
    }
    if (tokens < requestTokens) {
      uint256 rate = s_bucket.rate;
      // Wait required until the bucket is refilled enough to accept this value, round up to next higher second
      // Consume is not guaranteed to succeed after wait time passes if there is competing traffic.
      // This acts as a lower bound of wait time.
      uint256 minWaitInSeconds = ((requestTokens - tokens) + (rate - 1)) / rate;

      if (tokenAddress == address(0)) revert AggregateValueRateLimitReached(minWaitInSeconds, tokens);
      revert TokenRateLimitReached(minWaitInSeconds, tokens, tokenAddress);
    }
    tokens -= requestTokens;

    // Downcast is safe here, as tokens is not larger than capacity
    s_bucket.tokens = uint128(tokens);
    emit TokensConsumed(requestTokens);
  }

  /// @notice Gets the token bucket with its values for the block it was requested at.
  /// @return The token bucket.
  function _currentTokenBucketState(TokenBucket memory bucket) internal view returns (TokenBucket memory) {
    // We update the bucket to reflect the status at the exact time of the
    // call. This means we might need to refill a part of the bucket based
    // on the time that has passed since the last update.
    bucket.tokens = uint128(
      _calculateRefill(bucket.capacity, bucket.tokens, block.timestamp - bucket.lastUpdated, bucket.rate)
    );
    bucket.lastUpdated = uint32(block.timestamp);
    return bucket;
  }

  /// @notice Sets the rate limited config.
  /// @param s_bucket The token bucket
  /// @param config The new config
  function _setTokenBucketConfig(TokenBucket storage s_bucket, Config memory config) internal {
    // First update the bucket to make sure the proper rate is used for all the time
    // up until the config change.
    uint256 timeDiff = block.timestamp - s_bucket.lastUpdated;
    if (timeDiff != 0) {
      s_bucket.tokens = uint128(_calculateRefill(s_bucket.capacity, s_bucket.tokens, timeDiff, s_bucket.rate));

      s_bucket.lastUpdated = uint32(block.timestamp);
    }

    s_bucket.tokens = uint128(_min(config.capacity, s_bucket.tokens));
    s_bucket.isEnabled = config.isEnabled;
    s_bucket.capacity = config.capacity;
    s_bucket.rate = config.rate;

    emit ConfigChanged(config);
  }

  /// @notice Calculate refilled tokens
  /// @param capacity bucket capacity
  /// @param tokens current bucket tokens
  /// @param timeDiff block time difference since last refill
  /// @param rate bucket refill rate
  /// @return the value of tokens after refill
  function _calculateRefill(
    uint256 capacity,
    uint256 tokens,
    uint256 timeDiff,
    uint256 rate
  ) private pure returns (uint256) {
    return _min(capacity, tokens + timeDiff * rate);
  }

  /// @notice Return the smallest of two integers
  /// @param a first int
  /// @param b second int
  /// @return smallest
  function _min(uint256 a, uint256 b) internal pure returns (uint256) {
    return a < b ? a : b;
  }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.0;

library USDPriceWith18Decimals {
  /// @notice Takes a price in USD, with 18 decimals per 1e18 token amount,
  /// and amount of the smallest token denomination,
  /// calculates the value in USD with 18 decimals.
  /// @param tokenPrice The USD price of the token.
  /// @param tokenAmount Amount of the smallest token denomination.
  /// @return USD value with 18 decimals.
  /// @dev this function assumes that no more than 1e59 US dollar worth of token is passed in.
  /// If more is sent, this function will overflow and revert.
  /// Since there isn't even close to 1e59 dollars, this is ok for all legit tokens.
  function _calcUSDValueFromTokenAmount(uint224 tokenPrice, uint256 tokenAmount) internal pure returns (uint256) {
    /// LINK Example:
    /// tokenPrice:         8e18 -> $8/LINK, as 1e18 token amount is 1 LINK, worth 8 USD, or 8e18 with 18 decimals
    /// tokenAmount:        2e18 -> 2 LINK
    /// result:             8e18 * 2e18 / 1e18 -> 16e18 with 18 decimals = $16

    /// USDC Example:
    /// tokenPrice:         1e30 -> $1/USDC, as 1e18 token amount is 1e12 USDC, worth 1e12 USD, or 1e30 with 18 decimals
    /// tokenAmount:        5e6  -> 5 USDC
    /// result:             1e30 * 5e6 / 1e18 -> 5e18 with 18 decimals = $5
    return (tokenPrice * tokenAmount) / 1e18;
  }

  /// @notice Takes a price in USD, with 18 decimals per 1e18 token amount,
  /// and USD value with 18 decimals,
  /// calculates amount of the smallest token denomination.
  /// @param tokenPrice The USD price of the token.
  /// @param usdValue USD value with 18 decimals.
  /// @return Amount of the smallest token denomination.
  function _calcTokenAmountFromUSDValue(uint224 tokenPrice, uint256 usdValue) internal pure returns (uint256) {
    /// LINK Example:
    /// tokenPrice:          8e18 -> $8/LINK, as 1e18 token amount is 1 LINK, worth 8 USD, or 8e18 with 18 decimals
    /// usdValue:           16e18 -> $16
    /// result:             16e18 * 1e18 / 8e18 -> 2e18 = 2 LINK

    /// USDC Example:
    /// tokenPrice:         1e30 -> $1/USDC, as 1e18 token amount is 1e12 USDC, worth 1e12 USD, or 1e30 with 18 decimals
    /// usdValue:           5e18 -> $5
    /// result:             5e18 * 1e18 / 1e30 -> 5e6 = 5 USDC
    return (usdValue * 1e18) / tokenPrice;
  }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import {EnumerableMap} from "../../vendor/openzeppelin-solidity/v4.8.0/contracts/utils/structs/EnumerableMap.sol";

library EnumerableMapAddresses {
  using EnumerableMap for EnumerableMap.UintToAddressMap;

  struct AddressToAddressMap {
    EnumerableMap.UintToAddressMap _inner;
  }

  // solhint-disable-next-line chainlink-solidity/prefix-internal-functions-with-underscore
  function set(AddressToAddressMap storage map, address key, address value) internal returns (bool) {
    return map._inner.set(uint256(uint160(key)), value);
  }

  // solhint-disable-next-line chainlink-solidity/prefix-internal-functions-with-underscore
  function remove(AddressToAddressMap storage map, address key) internal returns (bool) {
    return map._inner.remove(uint256(uint160(key)));
  }

  // solhint-disable-next-line chainlink-solidity/prefix-internal-functions-with-underscore
  function contains(AddressToAddressMap storage map, address key) internal view returns (bool) {
    return map._inner.contains(uint256(uint160(key)));
  }

  // solhint-disable-next-line chainlink-solidity/prefix-internal-functions-with-underscore
  function length(AddressToAddressMap storage map) internal view returns (uint256) {
    return map._inner.length();
  }

  // solhint-disable-next-line chainlink-solidity/prefix-internal-functions-with-underscore
  function at(AddressToAddressMap storage map, uint256 index) internal view returns (address, address) {
    (uint256 key, address value) = map._inner.at(index);
    return (address(uint160(key)), value);
  }

  // solhint-disable-next-line chainlink-solidity/prefix-internal-functions-with-underscore
  function tryGet(AddressToAddressMap storage map, address key) internal view returns (bool, address) {
    return map._inner.tryGet(uint256(uint160(key)));
  }

  // solhint-disable-next-line chainlink-solidity/prefix-internal-functions-with-underscore
  function get(AddressToAddressMap storage map, address key) internal view returns (address) {
    return map._inner.get(uint256(uint160(key)));
  }

  // solhint-disable-next-line chainlink-solidity/prefix-internal-functions-with-underscore
  function get(
    AddressToAddressMap storage map,
    address key,
    string memory errorMessage
  ) internal view returns (address) {
    return map._inner.get(uint256(uint160(key)), errorMessage);
  }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/draft-IERC20Permit.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));
    }
  }

  function safePermit(
    IERC20Permit token,
    address owner,
    address spender,
    uint256 value,
    uint256 deadline,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) internal {
    uint256 nonceBefore = token.nonces(owner);
    token.permit(owner, spender, value, deadline, v, r, s);
    uint256 nonceAfter = token.nonces(owner);
    require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
  }

  /**
   * @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 v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
  /**
   * @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);

  /**
   * @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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/structs/EnumerableMap.sol)
// This file was procedurally generated from scripts/generate/templates/EnumerableMap.js.

pragma solidity ^0.8.0;

import "./EnumerableSet.sol";

/**
 * @dev Library for managing an enumerable variant of Solidity's
 * https://solidity.readthedocs.io/en/latest/types.html#mapping-types[`mapping`]
 * type.
 *
 * Maps have the following properties:
 *
 * - Entries are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Entries are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableMap for EnumerableMap.UintToAddressMap;
 *
 *     // Declare a set state variable
 *     EnumerableMap.UintToAddressMap private myMap;
 * }
 * ```
 *
 * The following map types are supported:
 *
 * - `uint256 -> address` (`UintToAddressMap`) since v3.0.0
 * - `address -> uint256` (`AddressToUintMap`) since v4.6.0
 * - `bytes32 -> bytes32` (`Bytes32ToBytes32Map`) since v4.6.0
 * - `uint256 -> uint256` (`UintToUintMap`) since v4.7.0
 * - `bytes32 -> uint256` (`Bytes32ToUintMap`) since v4.7.0
 *
 * [WARNING]
 * ====
 * Trying to delete such a structure from storage will likely result in data corruption, rendering the structure
 * unusable.
 * See https://github.com/ethereum/solidity/pull/11843[ethereum/solidity#11843] for more info.
 *
 * In order to clean an EnumerableMap, you can either remove all elements one by one or create a fresh instance using an
 * array of EnumerableMap.
 * ====
 */
library EnumerableMap {
  using EnumerableSet for EnumerableSet.Bytes32Set;

  // To implement this library for multiple types with as little code
  // repetition as possible, we write it in terms of a generic Map type with
  // bytes32 keys and values.
  // The Map implementation uses private functions, and user-facing
  // implementations (such as Uint256ToAddressMap) are just wrappers around
  // the underlying Map.
  // This means that we can only create new EnumerableMaps for types that fit
  // in bytes32.

  struct Bytes32ToBytes32Map {
    // Storage of keys
    EnumerableSet.Bytes32Set _keys;
    mapping(bytes32 => bytes32) _values;
  }

  /**
   * @dev Adds a key-value pair to a map, or updates the value for an existing
   * key. O(1).
   *
   * Returns true if the key was added to the map, that is if it was not
   * already present.
   */
  function set(
    Bytes32ToBytes32Map storage map,
    bytes32 key,
    bytes32 value
  ) internal returns (bool) {
    map._values[key] = value;
    return map._keys.add(key);
  }

  /**
   * @dev Removes a key-value pair from a map. O(1).
   *
   * Returns true if the key was removed from the map, that is if it was present.
   */
  function remove(Bytes32ToBytes32Map storage map, bytes32 key) internal returns (bool) {
    delete map._values[key];
    return map._keys.remove(key);
  }

  /**
   * @dev Returns true if the key is in the map. O(1).
   */
  function contains(Bytes32ToBytes32Map storage map, bytes32 key) internal view returns (bool) {
    return map._keys.contains(key);
  }

  /**
   * @dev Returns the number of key-value pairs in the map. O(1).
   */
  function length(Bytes32ToBytes32Map storage map) internal view returns (uint256) {
    return map._keys.length();
  }

  /**
   * @dev Returns the key-value pair stored at position `index` in the map. O(1).
   *
   * Note that there are no guarantees on the ordering of entries inside the
   * array, and it may change when more entries are added or removed.
   *
   * Requirements:
   *
   * - `index` must be strictly less than {length}.
   */
  function at(Bytes32ToBytes32Map storage map, uint256 index) internal view returns (bytes32, bytes32) {
    bytes32 key = map._keys.at(index);
    return (key, map._values[key]);
  }

  /**
   * @dev Tries to returns the value associated with `key`. O(1).
   * Does not revert if `key` is not in the map.
   */
  function tryGet(Bytes32ToBytes32Map storage map, bytes32 key) internal view returns (bool, bytes32) {
    bytes32 value = map._values[key];
    if (value == bytes32(0)) {
      return (contains(map, key), bytes32(0));
    } else {
      return (true, value);
    }
  }

  /**
   * @dev Returns the value associated with `key`. O(1).
   *
   * Requirements:
   *
   * - `key` must be in the map.
   */
  function get(Bytes32ToBytes32Map storage map, bytes32 key) internal view returns (bytes32) {
    bytes32 value = map._values[key];
    require(value != 0 || contains(map, key), "EnumerableMap: nonexistent key");
    return value;
  }

  /**
   * @dev Same as {get}, with a custom error message when `key` is not in the map.
   *
   * CAUTION: This function is deprecated because it requires allocating memory for the error
   * message unnecessarily. For custom revert reasons use {tryGet}.
   */
  function get(
    Bytes32ToBytes32Map storage map,
    bytes32 key,
    string memory errorMessage
  ) internal view returns (bytes32) {
    bytes32 value = map._values[key];
    require(value != 0 || contains(map, key), errorMessage);
    return value;
  }

  // UintToUintMap

  struct UintToUintMap {
    Bytes32ToBytes32Map _inner;
  }

  /**
   * @dev Adds a key-value pair to a map, or updates the value for an existing
   * key. O(1).
   *
   * Returns true if the key was added to the map, that is if it was not
   * already present.
   */
  function set(
    UintToUintMap storage map,
    uint256 key,
    uint256 value
  ) internal returns (bool) {
    return set(map._inner, bytes32(key), bytes32(value));
  }

  /**
   * @dev Removes a value from a set. O(1).
   *
   * Returns true if the key was removed from the map, that is if it was present.
   */
  function remove(UintToUintMap storage map, uint256 key) internal returns (bool) {
    return remove(map._inner, bytes32(key));
  }

  /**
   * @dev Returns true if the key is in the map. O(1).
   */
  function contains(UintToUintMap storage map, uint256 key) internal view returns (bool) {
    return contains(map._inner, bytes32(key));
  }

  /**
   * @dev Returns the number of elements in the map. O(1).
   */
  function length(UintToUintMap storage map) internal view returns (uint256) {
    return length(map._inner);
  }

  /**
   * @dev Returns the element stored at position `index` in the set. O(1).
   * Note that there are no guarantees on the ordering of values inside the
   * array, and it may change when more values are added or removed.
   *
   * Requirements:
   *
   * - `index` must be strictly less than {length}.
   */
  function at(UintToUintMap storage map, uint256 index) internal view returns (uint256, uint256) {
    (bytes32 key, bytes32 value) = at(map._inner, index);
    return (uint256(key), uint256(value));
  }

  /**
   * @dev Tries to returns the value associated with `key`. O(1).
   * Does not revert if `key` is not in the map.
   */
  function tryGet(UintToUintMap storage map, uint256 key) internal view returns (bool, uint256) {
    (bool success, bytes32 value) = tryGet(map._inner, bytes32(key));
    return (success, uint256(value));
  }

  /**
   * @dev Returns the value associated with `key`. O(1).
   *
   * Requirements:
   *
   * - `key` must be in the map.
   */
  function get(UintToUintMap storage map, uint256 key) internal view returns (uint256) {
    return uint256(get(map._inner, bytes32(key)));
  }

  /**
   * @dev Same as {get}, with a custom error message when `key` is not in the map.
   *
   * CAUTION: This function is deprecated because it requires allocating memory for the error
   * message unnecessarily. For custom revert reasons use {tryGet}.
   */
  function get(
    UintToUintMap storage map,
    uint256 key,
    string memory errorMessage
  ) internal view returns (uint256) {
    return uint256(get(map._inner, bytes32(key), errorMessage));
  }

  // UintToAddressMap

  struct UintToAddressMap {
    Bytes32ToBytes32Map _inner;
  }

  /**
   * @dev Adds a key-value pair to a map, or updates the value for an existing
   * key. O(1).
   *
   * Returns true if the key was added to the map, that is if it was not
   * already present.
   */
  function set(
    UintToAddressMap storage map,
    uint256 key,
    address value
  ) internal returns (bool) {
    return set(map._inner, bytes32(key), bytes32(uint256(uint160(value))));
  }

  /**
   * @dev Removes a value from a set. O(1).
   *
   * Returns true if the key was removed from the map, that is if it was present.
   */
  function remove(UintToAddressMap storage map, uint256 key) internal returns (bool) {
    return remove(map._inner, bytes32(key));
  }

  /**
   * @dev Returns true if the key is in the map. O(1).
   */
  function contains(UintToAddressMap storage map, uint256 key) internal view returns (bool) {
    return contains(map._inner, bytes32(key));
  }

  /**
   * @dev Returns the number of elements in the map. O(1).
   */
  function length(UintToAddressMap storage map) internal view returns (uint256) {
    return length(map._inner);
  }

  /**
   * @dev Returns the element stored at position `index` in the set. O(1).
   * Note that there are no guarantees on the ordering of values inside the
   * array, and it may change when more values are added or removed.
   *
   * Requirements:
   *
   * - `index` must be strictly less than {length}.
   */
  function at(UintToAddressMap storage map, uint256 index) internal view returns (uint256, address) {
    (bytes32 key, bytes32 value) = at(map._inner, index);
    return (uint256(key), address(uint160(uint256(value))));
  }

  /**
   * @dev Tries to returns the value associated with `key`. O(1).
   * Does not revert if `key` is not in the map.
   */
  function tryGet(UintToAddressMap storage map, uint256 key) internal view returns (bool, address) {
    (bool success, bytes32 value) = tryGet(map._inner, bytes32(key));
    return (success, address(uint160(uint256(value))));
  }

  /**
   * @dev Returns the value associated with `key`. O(1).
   *
   * Requirements:
   *
   * - `key` must be in the map.
   */
  function get(UintToAddressMap storage map, uint256 key) internal view returns (address) {
    return address(uint160(uint256(get(map._inner, bytes32(key)))));
  }

  /**
   * @dev Same as {get}, with a custom error message when `key` is not in the map.
   *
   * CAUTION: This function is deprecated because it requires allocating memory for the error
   * message unnecessarily. For custom revert reasons use {tryGet}.
   */
  function get(
    UintToAddressMap storage map,
    uint256 key,
    string memory errorMessage
  ) internal view returns (address) {
    return address(uint160(uint256(get(map._inner, bytes32(key), errorMessage))));
  }

  // AddressToUintMap

  struct AddressToUintMap {
    Bytes32ToBytes32Map _inner;
  }

  /**
   * @dev Adds a key-value pair to a map, or updates the value for an existing
   * key. O(1).
   *
   * Returns true if the key was added to the map, that is if it was not
   * already present.
   */
  function set(
    AddressToUintMap storage map,
    address key,
    uint256 value
  ) internal returns (bool) {
    return set(map._inner, bytes32(uint256(uint160(key))), bytes32(value));
  }

  /**
   * @dev Removes a value from a set. O(1).
   *
   * Returns true if the key was removed from the map, that is if it was present.
   */
  function remove(AddressToUintMap storage map, address key) internal returns (bool) {
    return remove(map._inner, bytes32(uint256(uint160(key))));
  }

  /**
   * @dev Returns true if the key is in the map. O(1).
   */
  function contains(AddressToUintMap storage map, address key) internal view returns (bool) {
    return contains(map._inner, bytes32(uint256(uint160(key))));
  }

  /**
   * @dev Returns the number of elements in the map. O(1).
   */
  function length(AddressToUintMap storage map) internal view returns (uint256) {
    return length(map._inner);
  }

  /**
   * @dev Returns the element stored at position `index` in the set. O(1).
   * Note that there are no guarantees on the ordering of values inside the
   * array, and it may change when more values are added or removed.
   *
   * Requirements:
   *
   * - `index` must be strictly less than {length}.
   */
  function at(AddressToUintMap storage map, uint256 index) internal view returns (address, uint256) {
    (bytes32 key, bytes32 value) = at(map._inner, index);
    return (address(uint160(uint256(key))), uint256(value));
  }

  /**
   * @dev Tries to returns the value associated with `key`. O(1).
   * Does not revert if `key` is not in the map.
   */
  function tryGet(AddressToUintMap storage map, address key) internal view returns (bool, uint256) {
    (bool success, bytes32 value) = tryGet(map._inner, bytes32(uint256(uint160(key))));
    return (success, uint256(value));
  }

  /**
   * @dev Returns the value associated with `key`. O(1).
   *
   * Requirements:
   *
   * - `key` must be in the map.
   */
  function get(AddressToUintMap storage map, address key) internal view returns (uint256) {
    return uint256(get(map._inner, bytes32(uint256(uint160(key)))));
  }

  /**
   * @dev Same as {get}, with a custom error message when `key` is not in the map.
   *
   * CAUTION: This function is deprecated because it requires allocating memory for the error
   * message unnecessarily. For custom revert reasons use {tryGet}.
   */
  function get(
    AddressToUintMap storage map,
    address key,
    string memory errorMessage
  ) internal view returns (uint256) {
    return uint256(get(map._inner, bytes32(uint256(uint160(key))), errorMessage));
  }

  // Bytes32ToUintMap

  struct Bytes32ToUintMap {
    Bytes32ToBytes32Map _inner;
  }

  /**
   * @dev Adds a key-value pair to a map, or updates the value for an existing
   * key. O(1).
   *
   * Returns true if the key was added to the map, that is if it was not
   * already present.
   */
  function set(
    Bytes32ToUintMap storage map,
    bytes32 key,
    uint256 value
  ) internal returns (bool) {
    return set(map._inner, key, bytes32(value));
  }

  /**
   * @dev Removes a value from a set. O(1).
   *
   * Returns true if the key was removed from the map, that is if it was present.
   */
  function remove(Bytes32ToUintMap storage map, bytes32 key) internal returns (bool) {
    return remove(map._inner, key);
  }

  /**
   * @dev Returns true if the key is in the map. O(1).
   */
  function contains(Bytes32ToUintMap storage map, bytes32 key) internal view returns (bool) {
    return contains(map._inner, key);
  }

  /**
   * @dev Returns the number of elements in the map. O(1).
   */
  function length(Bytes32ToUintMap storage map) internal view returns (uint256) {
    return length(map._inner);
  }

  /**
   * @dev Returns the element stored at position `index` in the set. O(1).
   * Note that there are no guarantees on the ordering of values inside the
   * array, and it may change when more values are added or removed.
   *
   * Requirements:
   *
   * - `index` must be strictly less than {length}.
   */
  function at(Bytes32ToUintMap storage map, uint256 index) internal view returns (bytes32, uint256) {
    (bytes32 key, bytes32 value) = at(map._inner, index);
    return (key, uint256(value));
  }

  /**
   * @dev Tries to returns the value associated with `key`. O(1).
   * Does not revert if `key` is not in the map.
   */
  function tryGet(Bytes32ToUintMap storage map, bytes32 key) internal view returns (bool, uint256) {
    (bool success, bytes32 value) = tryGet(map._inner, key);
    return (success, uint256(value));
  }

  /**
   * @dev Returns the value associated with `key`. O(1).
   *
   * Requirements:
   *
   * - `key` must be in the map.
   */
  function get(Bytes32ToUintMap storage map, bytes32 key) internal view returns (uint256) {
    return uint256(get(map._inner, key));
  }

  /**
   * @dev Same as {get}, with a custom error message when `key` is not in the map.
   *
   * CAUTION: This function is deprecated because it requires allocating memory for the error
   * message unnecessarily. For custom revert reasons use {tryGet}.
   */
  function get(
    Bytes32ToUintMap storage map,
    bytes32 key,
    string memory errorMessage
  ) internal view returns (uint256) {
    return uint256(get(map._inner, key, errorMessage));
  }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import {ConfirmedOwner} from "./ConfirmedOwner.sol";

/// @title The OwnerIsCreator contract
/// @notice A contract with helpers for basic contract ownership.
contract OwnerIsCreator is ConfirmedOwner {
  constructor() ConfirmedOwner(msg.sender) {}
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.0;

library MerkleMultiProof {
  /// @notice Leaf domain separator, should be used as the first 32 bytes of a leaf's preimage.
  bytes32 internal constant LEAF_DOMAIN_SEPARATOR = 0x0000000000000000000000000000000000000000000000000000000000000000;
  /// @notice Internal domain separator, should be used as the first 32 bytes of an internal node's preiimage.
  bytes32 internal constant INTERNAL_DOMAIN_SEPARATOR =
    0x0000000000000000000000000000000000000000000000000000000000000001;

  uint256 internal constant MAX_NUM_HASHES = 256;

  error InvalidProof();
  error LeavesCannotBeEmpty();

  /// @notice Computes the root based on provided pre-hashed leaf nodes in
  /// leaves, internal nodes in proofs, and using proofFlagBits' i-th bit to
  /// determine if an element of proofs or one of the previously computed leafs
  /// or internal nodes will be used for the i-th hash.
  /// @param leaves Should be pre-hashed and the first 32 bytes of a leaf's
  /// preimage should match LEAF_DOMAIN_SEPARATOR.
  /// @param proofs The hashes to be used instead of a leaf hash when the proofFlagBits
  ///  indicates a proof should be used.
  /// @param proofFlagBits A single uint256 of which each bit indicates whether a leaf or
  ///  a proof needs to be used in a hash operation.
  /// @dev the maximum number of hash operations it set to 256. Any input that would require
  ///  more than 256 hashes to get to a root will revert.
  /// @dev For given input `leaves` = [a,b,c] `proofs` = [D] and `proofFlagBits` = 5
  ///     totalHashes = 3 + 1 - 1 = 3
  ///  ** round 1 **
  ///    proofFlagBits = (5 >> 0) & 1 = true
  ///    hashes[0] = hashPair(a, b)
  ///    (leafPos, hashPos, proofPos) = (2, 0, 0);
  ///
  ///  ** round 2 **
  ///    proofFlagBits = (5 >> 1) & 1 = false
  ///    hashes[1] = hashPair(D, c)
  ///    (leafPos, hashPos, proofPos) = (3, 0, 1);
  ///
  ///  ** round 3 **
  ///    proofFlagBits = (5 >> 2) & 1 = true
  ///    hashes[2] = hashPair(hashes[0], hashes[1])
  ///    (leafPos, hashPos, proofPos) = (3, 2, 1);
  ///
  ///    i = 3 and no longer < totalHashes. The algorithm is done
  ///    return hashes[totalHashes - 1] = hashes[2]; the last hash we computed.
  // We mark this function as internal to force it to be inlined in contracts
  // that use it, but semantically it is public.
  // solhint-disable-next-line chainlink-solidity/prefix-internal-functions-with-underscore
  function merkleRoot(
    bytes32[] memory leaves,
    bytes32[] memory proofs,
    uint256 proofFlagBits
  ) internal pure returns (bytes32) {
    unchecked {
      uint256 leavesLen = leaves.length;
      uint256 proofsLen = proofs.length;
      if (leavesLen == 0) revert LeavesCannotBeEmpty();
      if (!(leavesLen <= MAX_NUM_HASHES + 1 && proofsLen <= MAX_NUM_HASHES + 1)) revert InvalidProof();
      uint256 totalHashes = leavesLen + proofsLen - 1;
      if (!(totalHashes <= MAX_NUM_HASHES)) revert InvalidProof();
      if (totalHashes == 0) {
        return leaves[0];
      }
      bytes32[] memory hashes = new bytes32[](totalHashes);
      (uint256 leafPos, uint256 hashPos, uint256 proofPos) = (0, 0, 0);

      for (uint256 i = 0; i < totalHashes; ++i) {
        // Checks if the bit flag signals the use of a supplied proof or a leaf/previous hash.
        bytes32 a;
        if (proofFlagBits & (1 << i) == (1 << i)) {
          // Use a leaf or a previously computed hash.
          if (leafPos < leavesLen) {
            a = leaves[leafPos++];
          } else {
            a = hashes[hashPos++];
          }
        } else {
          // Use a supplied proof.
          a = proofs[proofPos++];
        }

        // The second part of the hashed pair is never a proof as hashing two proofs would result in a
        // hash that can already be computed offchain.
        bytes32 b;
        if (leafPos < leavesLen) {
          b = leaves[leafPos++];
        } else {
          b = hashes[hashPos++];
        }

        if (!(hashPos <= i)) revert InvalidProof();

        hashes[i] = _hashPair(a, b);
      }
      if (!(hashPos == totalHashes - 1 && leafPos == leavesLen && proofPos == proofsLen)) revert InvalidProof();
      // Return the last hash.
      return hashes[totalHashes - 1];
    }
  }

  /// @notice Hashes two bytes32 objects in their given order, prepended by the
  /// INTERNAL_DOMAIN_SEPARATOR.
  function _hashInternalNode(bytes32 left, bytes32 right) private pure returns (bytes32 hash) {
    return keccak256(abi.encode(INTERNAL_DOMAIN_SEPARATOR, left, right));
  }

  /// @notice Hashes two bytes32 objects. The order is taken into account,
  /// using the lower value first.
  function _hashPair(bytes32 a, bytes32 b) private pure returns (bytes32) {
    return a < b ? _hashInternalNode(a, b) : _hashInternalNode(b, a);
  }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
  /**
   * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
   * given ``owner``'s signed approval.
   *
   * IMPORTANT: The same issues {IERC20-approve} has related to transaction
   * ordering also apply here.
   *
   * Emits an {Approval} event.
   *
   * Requirements:
   *
   * - `spender` cannot be the zero address.
   * - `deadline` must be a timestamp in the future.
   * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
   * over the EIP712-formatted function arguments.
   * - the signature must use ``owner``'s current nonce (see {nonces}).
   *
   * For more information on the signature format, see the
   * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
   * section].
   */
  function permit(
    address owner,
    address spender,
    uint256 value,
    uint256 deadline,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) external;

  /**
   * @dev Returns the current nonce for `owner`. This value must be
   * included whenever a signature is generated for {permit}.
   *
   * Every successful call to {permit} increases ``owner``'s nonce by one. This
   * prevents a signature from being used multiple times.
   */
  function nonces(address owner) external view returns (uint256);

  /**
   * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
   */
  // solhint-disable-next-line func-name-mixedcase
  function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (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 functionCallWithValue(target, data, 0, "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");
    (bool success, bytes memory returndata) = target.call{value: value}(data);
    return verifyCallResultFromTarget(target, 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) {
    (bool success, bytes memory returndata) = target.staticcall(data);
    return verifyCallResultFromTarget(target, 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) {
    (bool success, bytes memory returndata) = target.delegatecall(data);
    return verifyCallResultFromTarget(target, success, returndata, errorMessage);
  }

  /**
   * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
   * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
   *
   * _Available since v4.8._
   */
  function verifyCallResultFromTarget(
    address target,
    bool success,
    bytes memory returndata,
    string memory errorMessage
  ) internal view returns (bytes memory) {
    if (success) {
      if (returndata.length == 0) {
        // only check isContract if the call was successful and the return data is empty
        // otherwise we already know that it was a contract
        require(isContract(target), "Address: call to non-contract");
      }
      return returndata;
    } else {
      _revert(returndata, errorMessage);
    }
  }

  /**
   * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
   * revert reason or 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 {
      _revert(returndata, errorMessage);
    }
  }

  function _revert(bytes memory returndata, string memory errorMessage) private pure {
    // 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
      /// @solidity memory-safe-assembly
      assembly {
        let returndata_size := mload(returndata)
        revert(add(32, returndata), returndata_size)
      }
    } else {
      revert(errorMessage);
    }
  }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/structs/EnumerableSet.sol)
// This file was procedurally generated from scripts/generate/templates/EnumerableSet.js.

pragma solidity ^0.8.0;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 *
 * [WARNING]
 * ====
 * Trying to delete such a structure from storage will likely result in data corruption, rendering the structure
 * unusable.
 * See https://github.com/ethereum/solidity/pull/11843[ethereum/solidity#11843] for more info.
 *
 * In order to clean an EnumerableSet, you can either remove all elements one by one or create a fresh instance using an
 * array of EnumerableSet.
 * ====
 */
library EnumerableSet {
  // To implement this library for multiple types with as little code
  // repetition as possible, we write it in terms of a generic Set type with
  // bytes32 values.
  // The Set implementation uses private functions, and user-facing
  // implementations (such as AddressSet) are just wrappers around the
  // underlying Set.
  // This means that we can only create new EnumerableSets for types that fit
  // in bytes32.

  struct Set {
    // Storage of set values
    bytes32[] _values;
    // Position of the value in the `values` array, plus 1 because index 0
    // means a value is not in the set.
    mapping(bytes32 => uint256) _indexes;
  }

  /**
   * @dev Add a value to a set. O(1).
   *
   * Returns true if the value was added to the set, that is if it was not
   * already present.
   */
  function _add(Set storage set, bytes32 value) private returns (bool) {
    if (!_contains(set, value)) {
      set._values.push(value);
      // The value is stored at length-1, but we add 1 to all indexes
      // and use 0 as a sentinel value
      set._indexes[value] = set._values.length;
      return true;
    } else {
      return false;
    }
  }

  /**
   * @dev Removes a value from a set. O(1).
   *
   * Returns true if the value was removed from the set, that is if it was
   * present.
   */
  function _remove(Set storage set, bytes32 value) private returns (bool) {
    // We read and store the value's index to prevent multiple reads from the same storage slot
    uint256 valueIndex = set._indexes[value];

    if (valueIndex != 0) {
      // Equivalent to contains(set, value)
      // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
      // the array, and then remove the last element (sometimes called as 'swap and pop').
      // This modifies the order of the array, as noted in {at}.

      uint256 toDeleteIndex = valueIndex - 1;
      uint256 lastIndex = set._values.length - 1;

      if (lastIndex != toDeleteIndex) {
        bytes32 lastValue = set._values[lastIndex];

        // Move the last value to the index where the value to delete is
        set._values[toDeleteIndex] = lastValue;
        // Update the index for the moved value
        set._indexes[lastValue] = valueIndex; // Replace lastValue's index to valueIndex
      }

      // Delete the slot where the moved value was stored
      set._values.pop();

      // Delete the index for the deleted slot
      delete set._indexes[value];

      return true;
    } else {
      return false;
    }
  }

  /**
   * @dev Returns true if the value is in the set. O(1).
   */
  function _contains(Set storage set, bytes32 value) private view returns (bool) {
    return set._indexes[value] != 0;
  }

  /**
   * @dev Returns the number of values on the set. O(1).
   */
  function _length(Set storage set) private view returns (uint256) {
    return set._values.length;
  }

  /**
   * @dev Returns the value stored at position `index` in the set. O(1).
   *
   * Note that there are no guarantees on the ordering of values inside the
   * array, and it may change when more values are added or removed.
   *
   * Requirements:
   *
   * - `index` must be strictly less than {length}.
   */
  function _at(Set storage set, uint256 index) private view returns (bytes32) {
    return set._values[index];
  }

  /**
   * @dev Return the entire set in an array
   *
   * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
   * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
   * this function has an unbounded cost, and using it as part of a state-changing function may render the function
   * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
   */
  function _values(Set storage set) private view returns (bytes32[] memory) {
    return set._values;
  }

  // Bytes32Set

  struct Bytes32Set {
    Set _inner;
  }

  /**
   * @dev Add a value to a set. O(1).
   *
   * Returns true if the value was added to the set, that is if it was not
   * already present.
   */
  function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
    return _add(set._inner, value);
  }

  /**
   * @dev Removes a value from a set. O(1).
   *
   * Returns true if the value was removed from the set, that is if it was
   * present.
   */
  function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
    return _remove(set._inner, value);
  }

  /**
   * @dev Returns true if the value is in the set. O(1).
   */
  function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
    return _contains(set._inner, value);
  }

  /**
   * @dev Returns the number of values in the set. O(1).
   */
  function length(Bytes32Set storage set) internal view returns (uint256) {
    return _length(set._inner);
  }

  /**
   * @dev Returns the value stored at position `index` in the set. O(1).
   *
   * Note that there are no guarantees on the ordering of values inside the
   * array, and it may change when more values are added or removed.
   *
   * Requirements:
   *
   * - `index` must be strictly less than {length}.
   */
  function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
    return _at(set._inner, index);
  }

  /**
   * @dev Return the entire set in an array
   *
   * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
   * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
   * this function has an unbounded cost, and using it as part of a state-changing function may render the function
   * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
   */
  function values(Bytes32Set storage set) internal view returns (bytes32[] memory) {
    bytes32[] memory store = _values(set._inner);
    bytes32[] memory result;

    /// @solidity memory-safe-assembly
    assembly {
      result := store
    }

    return result;
  }

  // AddressSet

  struct AddressSet {
    Set _inner;
  }

  /**
   * @dev Add a value to a set. O(1).
   *
   * Returns true if the value was added to the set, that is if it was not
   * already present.
   */
  function add(AddressSet storage set, address value) internal returns (bool) {
    return _add(set._inner, bytes32(uint256(uint160(value))));
  }

  /**
   * @dev Removes a value from a set. O(1).
   *
   * Returns true if the value was removed from the set, that is if it was
   * present.
   */
  function remove(AddressSet storage set, address value) internal returns (bool) {
    return _remove(set._inner, bytes32(uint256(uint160(value))));
  }

  /**
   * @dev Returns true if the value is in the set. O(1).
   */
  function contains(AddressSet storage set, address value) internal view returns (bool) {
    return _contains(set._inner, bytes32(uint256(uint160(value))));
  }

  /**
   * @dev Returns the number of values in the set. O(1).
   */
  function length(AddressSet storage set) internal view returns (uint256) {
    return _length(set._inner);
  }

  /**
   * @dev Returns the value stored at position `index` in the set. O(1).
   *
   * Note that there are no guarantees on the ordering of values inside the
   * array, and it may change when more values are added or removed.
   *
   * Requirements:
   *
   * - `index` must be strictly less than {length}.
   */
  function at(AddressSet storage set, uint256 index) internal view returns (address) {
    return address(uint160(uint256(_at(set._inner, index))));
  }

  /**
   * @dev Return the entire set in an array
   *
   * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
   * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
   * this function has an unbounded cost, and using it as part of a state-changing function may render the function
   * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
   */
  function values(AddressSet storage set) internal view returns (address[] memory) {
    bytes32[] memory store = _values(set._inner);
    address[] memory result;

    /// @solidity memory-safe-assembly
    assembly {
      result := store
    }

    return result;
  }

  // UintSet

  struct UintSet {
    Set _inner;
  }

  /**
   * @dev Add a value to a set. O(1).
   *
   * Returns true if the value was added to the set, that is if it was not
   * already present.
   */
  function add(UintSet storage set, uint256 value) internal returns (bool) {
    return _add(set._inner, bytes32(value));
  }

  /**
   * @dev Removes a value from a set. O(1).
   *
   * Returns true if the value was removed from the set, that is if it was
   * present.
   */
  function remove(UintSet storage set, uint256 value) internal returns (bool) {
    return _remove(set._inner, bytes32(value));
  }

  /**
   * @dev Returns true if the value is in the set. O(1).
   */
  function contains(UintSet storage set, uint256 value) internal view returns (bool) {
    return _contains(set._inner, bytes32(value));
  }

  /**
   * @dev Returns the number of values in the set. O(1).
   */
  function length(UintSet storage set) internal view returns (uint256) {
    return _length(set._inner);
  }

  /**
   * @dev Returns the value stored at position `index` in the set. O(1).
   *
   * Note that there are no guarantees on the ordering of values inside the
   * array, and it may change when more values are added or removed.
   *
   * Requirements:
   *
   * - `index` must be strictly less than {length}.
   */
  function at(UintSet storage set, uint256 index) internal view returns (uint256) {
    return uint256(_at(set._inner, index));
  }

  /**
   * @dev Return the entire set in an array
   *
   * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
   * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
   * this function has an unbounded cost, and using it as part of a state-changing function may render the function
   * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
   */
  function values(UintSet storage set) internal view returns (uint256[] memory) {
    bytes32[] memory store = _values(set._inner);
    uint256[] memory result;

    /// @solidity memory-safe-assembly
    assembly {
      result := store
    }

    return result;
  }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import {ConfirmedOwnerWithProposal} from "./ConfirmedOwnerWithProposal.sol";

/**
 * @title The ConfirmedOwner contract
 * @notice A contract with helpers for basic contract ownership.
 */
contract ConfirmedOwner is ConfirmedOwnerWithProposal {
  constructor(address newOwner) ConfirmedOwnerWithProposal(newOwner, address(0)) {}
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import {IOwnable} from "../interfaces/IOwnable.sol";

/**
 * @title The ConfirmedOwner contract
 * @notice A contract with helpers for basic contract ownership.
 */
contract ConfirmedOwnerWithProposal is IOwnable {
  address private s_owner;
  address private s_pendingOwner;

  event OwnershipTransferRequested(address indexed from, address indexed to);
  event OwnershipTransferred(address indexed from, address indexed to);

  constructor(address newOwner, address pendingOwner) {
    // solhint-disable-next-line custom-errors
    require(newOwner != address(0), "Cannot set owner to zero");

    s_owner = newOwner;
    if (pendingOwner != address(0)) {
      _transferOwnership(pendingOwner);
    }
  }

  /**
   * @notice Allows an owner to begin transferring ownership to a new address,
   * pending.
   */
  function transferOwnership(address to) public override onlyOwner {
    _transferOwnership(to);
  }

  /**
   * @notice Allows an ownership transfer to be completed by the recipient.
   */
  function acceptOwnership() external override {
    // solhint-disable-next-line custom-errors
    require(msg.sender == s_pendingOwner, "Must be proposed owner");

    address oldOwner = s_owner;
    s_owner = msg.sender;
    s_pendingOwner = address(0);

    emit OwnershipTransferred(oldOwner, msg.sender);
  }

  /**
   * @notice Get the current owner
   */
  function owner() public view override returns (address) {
    return s_owner;
  }

  /**
   * @notice validate, transfer ownership, and emit relevant events
   */
  function _transferOwnership(address to) private {
    // solhint-disable-next-line custom-errors
    require(to != msg.sender, "Cannot transfer to self");

    s_pendingOwner = to;

    emit OwnershipTransferRequested(s_owner, to);
  }

  /**
   * @notice validate access
   */
  function _validateOwnership() internal view {
    // solhint-disable-next-line custom-errors
    require(msg.sender == s_owner, "Only callable by owner");
  }

  /**
   * @notice Reverts if called by anyone other than the contract owner.
   */
  modifier onlyOwner() {
    _validateOwnership();
    _;
  }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IOwnable {
  function owner() external returns (address);

  function transferOwnership(address recipient) external;

  function acceptOwnership() external;
}

{
  "remappings": [
    "ds-test/=foundry-lib/forge-std/lib/ds-test/src/",
    "forge-std/=foundry-lib/forge-std/src/",
    "@openzeppelin/=node_modules/@openzeppelin/",
    "hardhat/=node_modules/hardhat/",
    "@eth-optimism/=node_modules/@eth-optimism/",
    "@ensdomains/=node_modules/@ensdomains/",
    "eth-gas-reporter/=node_modules/eth-gas-reporter/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 10000
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "none",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "paris",
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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EVM2EVMOnRamp.TokenTransferFeeConfigArgs[]","name":"tokenTransferFeeConfigArgs","type":"tuple[]"}],"name":"setTokenTransferFeeConfig","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"typeAndVersion","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"feeToken","type":"address"},{"internalType":"address","name":"to","type":"address"}],"name":"withdrawNonLinkFees","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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