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/**
 * Copyright Uniswap Foundation 2023
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 *
 * SPDX-License-Identifier: Apache-2.0
 */
 pragma solidity ^0.8.7;

 // solhint-disable-next-line no-global-import
 import "./Structs.sol";
 
 interface IWormhole {
     function parseAndVerifyVM(bytes calldata encodedVM)
         external
         view
         returns (Structs.VM memory vm, bool valid, string memory reason);
 }
 
 /**
  * @title Uniswap Wormhole Message Receiver
  * @dev This contract receives and executes Uniswap governance proposals that were sent from the UniswapWormholeMessageSender
  * contract on Ethereum via Wormhole.
  *
  * It enforces that proposals are executed in order, but it does not guarantee that all proposals are executed.
  * i.e. The message sequence number of proposals must be strictly monotonically increasing, but need not be consecutive
  * The maximum number of proposals that can be received is therefore UINT64_MAX.
  * For example, if there are proposals 1, 2 and 3, then the following are valid executions (not exhaustive):
  * - 1,2,3
  * - 1,3
  * But the following are impossible (not exhaustive):
  * - 1,3,2
  */
 contract UniswapWormholeMessageReceiver {
     string public constant NAME = "Uniswap Wormhole Message Receiver";
     bytes32 public constant EXPECTED_MESSAGE_PAYLOAD_VERSION = keccak256(
         abi.encode(
             "UniswapWormholeMessageSenderV1 (bytes32 receivedMessagePayloadVersion, address[] memory targets, uint256[] memory values, bytes[] memory datas, address messageReceiver, uint16 receiverChainId)"
         )
     );
 
     // Address of the UniswapWormholeMessageSender contract on ethereum in Wormhole format,
     // i.e. 12 zero bytes followed by a 20-byte Ethereum address.
     bytes32 public immutable messageSender;
 
     // A uint16 definining the destination chain of a VAA this contract will trust
     uint16 public immutable chainId;
 
     // A uint16 definining the source chain of a VAA this contract will trust
     uint16 public constant ETHEREUM_CHAIN_ID = 2;
 
     IWormhole private immutable wormhole;
 
     // the next message must have at least this sequence number
     uint64 public nextMinimumSequence = 0;
 
     /**
      * Message timeout in seconds: Time out needs to account for:
      * - Finality time on source chain
      * - Time for Wormhole validators to sign and make VAA available to relayers
      * - Time to relay VAA to the target chain
      * - Congestion on target chain leading to delayed inclusion of transaction in target chain
      *
      * Note that there is no way to alter this hard coded value. Including such a feature
      * would require some governance structure and some minumum and maximum values.
      */
     uint256 public constant MESSAGE_TIME_OUT_SECONDS = 2 days;
 
     /**
      * @param wormholeAddress Address of Wormhole core messaging contract on this chain.
      * @param _messageSender Address of the UniswapWormholeMessageSender contract on ethereum in Wormhole format,
      * i.e. 12 zero bytes followed by a 20-byte Ethereum address.
      */
     constructor(address wormholeAddress, bytes32 _messageSender, uint16 _chainId) {
         // sanity check constructor args
         require(wormholeAddress != address(0), "Invalid wormhole address");
         require(_messageSender != bytes32(0) && bytes12(_messageSender) == 0, "Invalid sender contract");
         require(_chainId != ETHEREUM_CHAIN_ID, "Invalid chainId Ethereum");
 
         wormhole = IWormhole(wormholeAddress);
         messageSender = _messageSender;
         chainId = _chainId;
     }
 
     /**
      * @param whMessage Wormhole message relayed from a source chain.
      */
     function receiveMessage(bytes calldata whMessage) external payable {
         (Structs.VM memory vm, bool valid, string memory reason) = wormhole.parseAndVerifyVM(whMessage);
 
         // validate
         require(valid, reason);
 
         // ensure the emitterAddress of this VAA is the Uniswap message sender
         require(messageSender == vm.emitterAddress, "Invalid Emitter Address!");
 
         // ensure the emitterChainId is Ethereum to prevent impersonation
         require(vm.emitterChainId == ETHEREUM_CHAIN_ID, "Invalid Emitter Chain");
 
         /**
          * Ensure that the sequence field in the VAA is strictly monotonically increasing. This also acts as
          * a replay protection mechanism to ensure that already executed messages don't execute again.
          *
          * WARNING: Be mindful that if the sender is ever adapted to support multiple consistency levels, the sequence number
          * enforcement in the receiver could result in delivery of a message with a higher sequence number first and thus
          * invalidate the lower sequence number message from being processable on the receiver. As long as CONSISTENCY_LEVEL
          * remains a constant this is a non-issue. If this changes, changes to the receiver may be required to address messages
          * of variable consistency.
          */
         require(vm.sequence >= nextMinimumSequence, "Invalid Sequence number");
         // increase nextMinimumSequence
         nextMinimumSequence = vm.sequence + 1;
 
         // check if the message is still valid as defined by the validity period
         // solhint-disable-next-line not-rely-on-time
         require(vm.timestamp + MESSAGE_TIME_OUT_SECONDS >= block.timestamp, "Message no longer valid");
 
         // verify destination
         (
             bytes32 receivedMessagePayloadVersion,
             address[] memory targets,
             uint256[] memory values,
             bytes[] memory calldatas,
             address messageReceiver,
             uint16 receiverChainId
         ) = abi.decode(vm.payload, (bytes32, address[], uint256[], bytes[], address, uint16));
         require(EXPECTED_MESSAGE_PAYLOAD_VERSION == receivedMessagePayloadVersion, "Wrong payload version");
         require(messageReceiver == address(this), "Message not for this dest");
         require(receiverChainId == chainId, "Message not for this chain");
 
         // cache target length and verify that each argument has the same length
         uint256 targetsLength = targets.length;
         require(targetsLength == calldatas.length && targetsLength == values.length, "Inconsistent argument lengths");
 
         // verify that the caller sent enough value to make each target call
         require(verifyTargetValues(values), "Incorrect value");
 
         // execute each message
         for (uint256 i = 0; i < targetsLength;) {
             (bool success,) = targets[i].call{value: values[i]}(calldatas[i]);
             require(success, "Sub-call failed");
 
             unchecked {
                 i += 1;
             }
         }
     }
 
     function verifyTargetValues(uint256[] memory values) internal view returns (bool) {
         uint256 valuesSum;
 
         uint256 valuesLength = values.length;
         for (uint256 i = 0; i < valuesLength;) {
             valuesSum += values[i];
 
             unchecked {
                 i += 1;
             }
         }
 
         return valuesSum == msg.value;
     }
 }

// contracts/Structs.sol
// SPDX-License-Identifier: Apache 2

pragma solidity ^0.8.9;

interface Structs {
    struct Provider {
        uint16 chainId;
        uint16 governanceChainId;
        bytes32 governanceContract;
    }

    struct GuardianSet {
        address[] keys;
        uint32 expirationTime;
    }

    struct Signature {
        bytes32 r;
        bytes32 s;
        uint8 v;
        uint8 guardianIndex;
    }

    struct VM {
        uint8 version;
        uint32 timestamp;
        uint32 nonce;
        uint16 emitterChainId;
        bytes32 emitterAddress;
        uint64 sequence;
        uint8 consistencyLevel;
        bytes payload;
        uint32 guardianSetIndex;
        Signature[] signatures;
        bytes32 hash;
    }
}

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

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[{"inputs":[{"internalType":"address","name":"wormholeAddress","type":"address"},{"internalType":"bytes32","name":"_messageSender","type":"bytes32"},{"internalType":"uint16","name":"_chainId","type":"uint16"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"ETHEREUM_CHAIN_ID","outputs":[{"internalType":"uint16","name":"","type":"uint16"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"EXPECTED_MESSAGE_PAYLOAD_VERSION","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"MESSAGE_TIME_OUT_SECONDS","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"NAME","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"chainId","outputs":[{"internalType":"uint16","name":"","type":"uint16"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"messageSender","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"nextMinimumSequence","outputs":[{"internalType":"uint64","name":"","type":"uint64"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes","name":"whMessage","type":"bytes"}],"name":"receiveMessage","outputs":[],"stateMutability":"payable","type":"function"}]

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000000000000000000000000c8e2b0cd52cf01b0ce87d389daa3d414d4ce29f3000000000000000000000000f5f4496219f31cdcba6130b5402873624585615a0000000000000000000000000000000000000000000000000000000000000010

-----Decoded View---------------
Arg [0] : wormholeAddress (address): 0xC8e2b0cD52Cf01b0Ce87d389Daa3d414d4cE29f3
Arg [1] : _messageSender (bytes32): 0x000000000000000000000000f5f4496219f31cdcba6130b5402873624585615a
Arg [2] : _chainId (uint16): 16

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 000000000000000000000000c8e2b0cd52cf01b0ce87d389daa3d414d4ce29f3
Arg [1] : 000000000000000000000000f5f4496219f31cdcba6130b5402873624585615a
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000010