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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;

import {IUpgradeableLockReleaseTokenPool, RateLimiter} from './dependencies/Ccip.sol';
import {IGhoCcipSteward} from './interfaces/IGhoCcipSteward.sol';
import {RiskCouncilControlled} from './RiskCouncilControlled.sol';

/**
 * @title GhoCcipSteward
 * @author Aave Labs
 * @notice Helper contract for managing parameters of the CCIP token pools
 * @dev Only the Risk Council is able to action contract's functions, based on specific conditions that have been agreed upon with the community.
 * @dev Requires roles RateLimitAdmin and BridgeLimitAdmin (if on Ethereum) on GhoTokenPool
 */
contract GhoCcipSteward is RiskCouncilControlled, IGhoCcipSteward {
  /// @inheritdoc IGhoCcipSteward
  uint256 public constant MINIMUM_DELAY = 1 days;

  /// @inheritdoc IGhoCcipSteward
  address public immutable GHO_TOKEN;

  /// @inheritdoc IGhoCcipSteward
  address public immutable GHO_TOKEN_POOL;

  /// @inheritdoc IGhoCcipSteward
  bool public immutable BRIDGE_LIMIT_ENABLED;

  CcipDebounce internal _ccipTimelocks;

  /**
   * @dev Only methods that are not timelocked can be called if marked by this modifier.
   */
  modifier notTimelocked(uint40 timelock) {
    require(block.timestamp - timelock > MINIMUM_DELAY, 'DEBOUNCE_NOT_RESPECTED');
    _;
  }

  /**
   * @dev Constructor
   * @param ghoToken The address of the GhoToken
   * @param ghoTokenPool The address of the Gho CCIP Token Pool
   * @param riskCouncil The address of the risk council
   * @param bridgeLimitEnabled Whether the bridge limit feature is supported in the GhoTokenPool
   */
  constructor(
    address ghoToken,
    address ghoTokenPool,
    address riskCouncil,
    bool bridgeLimitEnabled
  ) RiskCouncilControlled(riskCouncil) {
    require(ghoToken != address(0), 'INVALID_GHO_TOKEN');
    require(ghoTokenPool != address(0), 'INVALID_GHO_TOKEN_POOL');

    GHO_TOKEN = ghoToken;
    GHO_TOKEN_POOL = ghoTokenPool;
    BRIDGE_LIMIT_ENABLED = bridgeLimitEnabled;
  }

  /// @inheritdoc IGhoCcipSteward
  function updateBridgeLimit(
    uint256 newBridgeLimit
  ) external onlyRiskCouncil notTimelocked(_ccipTimelocks.bridgeLimitLastUpdate) {
    require(BRIDGE_LIMIT_ENABLED, 'BRIDGE_LIMIT_DISABLED');

    uint256 currentBridgeLimit = IUpgradeableLockReleaseTokenPool(GHO_TOKEN_POOL).getBridgeLimit();
    require(newBridgeLimit != currentBridgeLimit, 'NO_CHANGE_IN_BRIDGE_LIMIT');
    require(
      _isDifferenceLowerThanMax(currentBridgeLimit, newBridgeLimit, currentBridgeLimit),
      'INVALID_BRIDGE_LIMIT_UPDATE'
    );

    _ccipTimelocks.bridgeLimitLastUpdate = uint40(block.timestamp);

    IUpgradeableLockReleaseTokenPool(GHO_TOKEN_POOL).setBridgeLimit(newBridgeLimit);
  }

  /// @inheritdoc IGhoCcipSteward
  function updateRateLimit(
    uint64 remoteChainSelector,
    bool outboundEnabled,
    uint128 outboundCapacity,
    uint128 outboundRate,
    bool inboundEnabled,
    uint128 inboundCapacity,
    uint128 inboundRate
  ) external onlyRiskCouncil notTimelocked(_ccipTimelocks.rateLimitLastUpdate) {
    RateLimiter.TokenBucket memory outboundConfig = IUpgradeableLockReleaseTokenPool(GHO_TOKEN_POOL)
      .getCurrentOutboundRateLimiterState(remoteChainSelector);
    RateLimiter.TokenBucket memory inboundConfig = IUpgradeableLockReleaseTokenPool(GHO_TOKEN_POOL)
      .getCurrentInboundRateLimiterState(remoteChainSelector);

    require(
      outboundEnabled != outboundConfig.isEnabled ||
        outboundCapacity != outboundConfig.capacity ||
        outboundRate != outboundConfig.rate ||
        inboundEnabled != inboundConfig.isEnabled ||
        inboundCapacity != inboundConfig.capacity ||
        inboundRate != inboundConfig.rate,
      'NO_CHANGE_IN_RATE_LIMIT'
    );

    require(
      _isDifferenceLowerThanMax(outboundConfig.capacity, outboundCapacity, outboundConfig.capacity),
      'INVALID_RATE_LIMIT_UPDATE'
    );
    require(
      _isDifferenceLowerThanMax(outboundConfig.rate, outboundRate, outboundConfig.rate),
      'INVALID_RATE_LIMIT_UPDATE'
    );
    require(
      _isDifferenceLowerThanMax(inboundConfig.capacity, inboundCapacity, inboundConfig.capacity),
      'INVALID_RATE_LIMIT_UPDATE'
    );
    require(
      _isDifferenceLowerThanMax(inboundConfig.rate, inboundRate, inboundConfig.rate),
      'INVALID_RATE_LIMIT_UPDATE'
    );

    _ccipTimelocks.rateLimitLastUpdate = uint40(block.timestamp);

    IUpgradeableLockReleaseTokenPool(GHO_TOKEN_POOL).setChainRateLimiterConfig(
      remoteChainSelector,
      RateLimiter.Config({
        isEnabled: outboundEnabled,
        capacity: outboundCapacity,
        rate: outboundRate
      }),
      RateLimiter.Config({isEnabled: inboundEnabled, capacity: inboundCapacity, rate: inboundRate})
    );
  }

  /// @inheritdoc IGhoCcipSteward
  function getCcipTimelocks() external view override returns (CcipDebounce memory) {
    return _ccipTimelocks;
  }

  /// @inheritdoc IGhoCcipSteward
  function RISK_COUNCIL() external view override returns (address) {
    return _riskCouncil;
  }

  /**
   * @dev Ensures that the change difference is lower than max.
   * @param from current value
   * @param to new value
   * @param max maximum difference between from and to
   * @return bool true if difference between values lower than max, false otherwise
   */
  function _isDifferenceLowerThanMax(
    uint256 from,
    uint256 to,
    uint256 max
  ) internal pure returns (bool) {
    return from < to ? to - from <= max : from - to <= max;
  }
}

// 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);
  }
}

/// @notice Implements Token Bucket rate limiting.
/// @dev Reduced library from https://github.com/aave/ccip/blob/ccip-gho/contracts/src/v0.8/ccip/libraries/RateLimiter.sol
/// @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 InvalidRatelimitRate(Config rateLimiterConfig);
  error DisabledNonZeroRateLimit(Config config);
  error RateLimitMustBeDisabled();

  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 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 Validates the token bucket config
  function _validateTokenBucketConfig(Config memory config, bool mustBeDisabled) internal pure {
    if (config.isEnabled) {
      if (config.rate >= config.capacity || config.rate == 0) {
        revert InvalidRatelimitRate(config);
      }
      if (mustBeDisabled) {
        revert RateLimitMustBeDisabled();
      }
    } else {
      if (config.rate != 0 || config.capacity != 0) {
        revert DisabledNonZeroRateLimit(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;
  }
}

/// @dev Reduced interface of CCIP Router contract with needed functions only
/// @dev Adapted from https://github.com/aave/ccip/blob/ccip-gho/contracts/src/v0.8/ccip/interfaces/IRouter.sol
interface IRouter {
  error OnlyOffRamp();

  /// @notice Route the message to its intended receiver contract.
  /// @param message Client.Any2EVMMessage struct.
  /// @param gasForCallExactCheck of params for exec
  /// @param gasLimit set of params for exec
  /// @param receiver set of params for exec
  /// @dev if the receiver is a contracts that signals support for CCIP execution through EIP-165.
  /// the contract is called. If not, only tokens are transferred.
  /// @return success A boolean value indicating whether the ccip message was received without errors.
  /// @return retBytes A bytes array containing return data form CCIP receiver.
  /// @return gasUsed the gas used by the external customer call. Does not include any overhead.
  function routeMessage(
    Client.Any2EVMMessage calldata message,
    uint16 gasForCallExactCheck,
    uint256 gasLimit,
    address receiver
  ) external returns (bool success, bytes memory retBytes, uint256 gasUsed);

  /// @notice Returns the configured onramp for a specific destination chain.
  /// @param destChainSelector The destination chain Id to get the onRamp for.
  /// @return onRampAddress The address of the onRamp.
  function getOnRamp(uint64 destChainSelector) external view returns (address onRampAddress);

  /// @notice Return true if the given offRamp is a configured offRamp for the given source chain.
  /// @param sourceChainSelector The source chain selector to check.
  /// @param offRamp The address of the offRamp to check.
  function isOffRamp(
    uint64 sourceChainSelector,
    address offRamp
  ) external view returns (bool isOffRamp);
}

/// @dev Reduced interface of CCIP UpgradeableLockReleaseTokenPool contract with needed functions only
/// @dev Adapted from https://github.com/aave/ccip/blob/ccip-gho/contracts/src/v0.8/ccip/pools/GHO/UpgradeableLockReleaseTokenPool.sol
interface IUpgradeableLockReleaseTokenPool {
  function setBridgeLimit(uint256 newBridgeLimit) external;

  function setChainRateLimiterConfig(
    uint64 remoteChainSelector,
    RateLimiter.Config memory outboundConfig,
    RateLimiter.Config memory inboundConfig
  ) external;

  function setRateLimitAdmin(address rateLimitAdmin) external;

  function setBridgeLimitAdmin(address bridgeLimitAdmin) external;

  function getRateLimitAdmin() external view returns (address);

  function getBridgeLimitAdmin() external view returns (address);

  function getBridgeLimit() external view returns (uint256);

  function getCurrentOutboundRateLimiterState(
    uint64 remoteChainSelector
  ) external view returns (RateLimiter.TokenBucket memory);

  function getCurrentInboundRateLimiterState(
    uint64 remoteChainSelector
  ) external view returns (RateLimiter.TokenBucket memory);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;

/**
 * @title IGhoCcipSteward
 * @author Aave Labs
 * @notice Defines the basic interface of the GhoCcipSteward
 */
interface IGhoCcipSteward {
  /**
   * @notice Struct storing the last update by the steward of the bridge and rate limit param.
   */
  struct CcipDebounce {
    uint40 bridgeLimitLastUpdate;
    uint40 rateLimitLastUpdate;
  }

  /**
   * @notice Updates the CCIP bridge limit
   * @dev Only callable by Risk Council
   * @param newBridgeLimit The new desired bridge limit
   */
  function updateBridgeLimit(uint256 newBridgeLimit) external;

  /**
   * @notice Updates the CCIP rate limit config
   * @dev Only callable by Risk Council
   * @dev Rate limit update must be consistent with other pools' rate limit
   * @param remoteChainSelector The remote chain selector for which the rate limits apply.
   * @param outboundEnabled True if the outbound rate limiter is enabled.
   * @param outboundCapacity The outbound rate limiter capacity.
   * @param outboundRate The outbound rate limiter rate.
   * @param inboundEnabled True if the inbound rate limiter is enabled.
   * @param inboundCapacity The inbound rate limiter capacity.
   * @param inboundRate The inbound rate limiter rate.
   */
  function updateRateLimit(
    uint64 remoteChainSelector,
    bool outboundEnabled,
    uint128 outboundCapacity,
    uint128 outboundRate,
    bool inboundEnabled,
    uint128 inboundCapacity,
    uint128 inboundRate
  ) external;

  /**
   * @notice Returns timestamp of the last update of Ccip parameters.
   * @return The CcipDebounce struct describing the last update of Ccip parameters.
   */
  function getCcipTimelocks() external view returns (CcipDebounce memory);

  /**
   * @notice Returns the minimum delay that must be respected between parameters update.
   * @return The minimum delay between parameter updates (in seconds)
   */
  function MINIMUM_DELAY() external view returns (uint256);

  /**
   * @notice Returns the address of the Gho Token
   * @return The address of the GhoToken
   */
  function GHO_TOKEN() external view returns (address);

  /**
   * @notice Returns the address of the Gho CCIP Token Pool
   * @return The address of the Gho CCIP Token Pool
   */
  function GHO_TOKEN_POOL() external view returns (address);

  /**
   * @notice Returns whether the bridge limit feature is supported in the GhoTokenPool
   * @return True if bridge limit is enabled in the CCIP GhoTokenPool, false otherwise
   */
  function BRIDGE_LIMIT_ENABLED() external view returns (bool);

  /**
   * @notice Returns the address of the risk council
   * @return The address of the RiskCouncil
   */
  function RISK_COUNCIL() external view returns (address);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;

/**
 * @title RiskCouncilControlled
 * @author Aave Labs
 * @notice Helper contract for controlling access to Steward and other functions restricted to Risk Council
 */
abstract contract RiskCouncilControlled {
  address internal immutable _riskCouncil;

  /**
   * @dev Constructor
   * @param riskCouncil The address of the risk council
   */
  constructor(address riskCouncil) {
    require(riskCouncil != address(0), 'INVALID_RISK_COUNCIL');
    _riskCouncil = riskCouncil;
  }

  /**
   * @dev Only Risk Council can call functions marked by this modifier.
   */
  modifier onlyRiskCouncil() {
    require(_riskCouncil == msg.sender, 'INVALID_CALLER');
    _;
  }
}

{
  "remappings": [
    "@aave/core-v3/=lib/aave-v3-core/",
    "@aave/periphery-v3/=lib/aave-v3-periphery/",
    "@aave/=lib/aave-token/",
    "@openzeppelin/=lib/openzeppelin-contracts/",
    "aave-stk-v1-5/=lib/aave-stk-v1-5/",
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "eth-gas-reporter/=node_modules/eth-gas-reporter/",
    "forge-std/=lib/forge-std/src/",
    "hardhat-deploy/=node_modules/hardhat-deploy/",
    "hardhat/=node_modules/hardhat/",
    "aave-address-book/=lib/aave-address-book/src/",
    "aave-helpers/=lib/aave-stk-v1-5/lib/aave-helpers/",
    "aave-v3-core/=lib/aave-address-book/lib/aave-v3-core/",
    "aave-v3-periphery/=lib/aave-address-book/lib/aave-v3-periphery/",
    "erc4626-tests/=lib/aave-stk-v1-5/lib/openzeppelin-contracts/lib/erc4626-tests/",
    "openzeppelin-contracts/=lib/aave-stk-v1-5/lib/openzeppelin-contracts/",
    "solidity-utils/=lib/solidity-utils/src/",
    "aave-token/=lib/aave-token/contracts/",
    "safety-module/=lib/safety-module/contracts/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs"
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "london",
  "viaIR": false
}

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[{"inputs":[{"internalType":"address","name":"ghoToken","type":"address"},{"internalType":"address","name":"ghoTokenPool","type":"address"},{"internalType":"address","name":"riskCouncil","type":"address"},{"internalType":"bool","name":"bridgeLimitEnabled","type":"bool"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"BRIDGE_LIMIT_ENABLED","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"GHO_TOKEN","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"GHO_TOKEN_POOL","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"MINIMUM_DELAY","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"RISK_COUNCIL","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getCcipTimelocks","outputs":[{"components":[{"internalType":"uint40","name":"bridgeLimitLastUpdate","type":"uint40"},{"internalType":"uint40","name":"rateLimitLastUpdate","type":"uint40"}],"internalType":"struct IGhoCcipSteward.CcipDebounce","name":"","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"newBridgeLimit","type":"uint256"}],"name":"updateBridgeLimit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint64","name":"remoteChainSelector","type":"uint64"},{"internalType":"bool","name":"outboundEnabled","type":"bool"},{"internalType":"uint128","name":"outboundCapacity","type":"uint128"},{"internalType":"uint128","name":"outboundRate","type":"uint128"},{"internalType":"bool","name":"inboundEnabled","type":"bool"},{"internalType":"uint128","name":"inboundCapacity","type":"uint128"},{"internalType":"uint128","name":"inboundRate","type":"uint128"}],"name":"updateRateLimit","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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000000000000000000000000fc421ad3c883bf9e7c4f42de845c4e4405799e73000000000000000000000000de6539018b095353a40753dc54c91c68c9487d4e0000000000000000000000008513e6f37dbc52de87b166980fa3f50639694b600000000000000000000000000000000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : ghoToken (address): 0xfc421aD3C883Bf9E7C4f42dE845C4e4405799e73
Arg [1] : ghoTokenPool (address): 0xDe6539018B095353A40753Dc54C91C68c9487D4E
Arg [2] : riskCouncil (address): 0x8513e6F37dBc52De87b166980Fa3F50639694B60
Arg [3] : bridgeLimitEnabled (bool): False

-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 000000000000000000000000fc421ad3c883bf9e7c4f42de845c4e4405799e73
Arg [1] : 000000000000000000000000de6539018b095353a40753dc54c91c68c9487d4e
Arg [2] : 0000000000000000000000008513e6f37dbc52de87b166980fa3f50639694b60
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000000