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// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity ^0.8;

/// @title CoW Protocol Hooks Trampoline
/// @dev A trampoline contract for calling user-specified hooks. It ensures that
/// user-specified calls are not executed from a privileged context, and that
/// reverts do not prevent settlements from executing.
/// @author CoW Developers
contract HooksTrampoline {
    /// @dev A user-specified hook.
    struct Hook {
        address target;
        bytes callData;
        uint256 gasLimit;
    }

    /// @dev Error indicating that the trampoline was not called from the CoW
    /// Protocol settlement contract.
    error NotASettlement();

    /// @dev The address of the CoW Protocol settlement contract.
    address public immutable settlement;

    /// @param settlement_ The address of the CoW protocol settlement contract.
    constructor(address settlement_) {
        settlement = settlement_;
    }

    /// @dev Modifier that ensures that the `msg.sender` is the CoW Protocol
    /// settlement contract. Methods with this modifier are guaranteed to only
    /// be called as part of a CoW Protocol settlement.
    modifier onlySettlement() {
        if (msg.sender != settlement) {
            revert NotASettlement();
        }
        _;
    }

    /// @dev Executes the specified hooks. This function will revert if not
    /// called by the CoW Protocol settlement contract. This allows hooks to be
    /// semi-permissioned, ensuring that they are only executed as part of a CoW
    /// Protocol settlement. Additionally, hooks are called with a gas limit,
    /// and are allowed to revert. This is done in order to prevent badly
    /// configured user-specified hooks from consuming more gas than expected
    /// (for example, if a hook were to revert with an `INVALID` opcode) or
    /// causing an otherwise valid settlement to revert, effectively
    /// DoS-ing other orders.
    ///
    /// @param hooks The hooks to execute.
    function execute(Hook[] calldata hooks) external onlySettlement {
        // Array bounds and overflow checks are not needed here, as `i` will
        // never overflow and `hooks[i]` will never be out of bounds as `i` is
        // smaller than `hooks.length`.
        unchecked {
            Hook calldata hook;
            for (uint256 i; i < hooks.length; ++i) {
                hook = hooks[i];

                (bool success,) = hook.target.call{gas: hook.gasLimit}(hook.callData);

                // In order to prevent custom hooks from DoS-ing settlements, we
                // explicitly allow them to revert.
                success;
            }
        }
    }
}

{
  "remappings": [
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "forge-std/=lib/forge-std/src/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 1000000
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "shanghai",
  "libraries": {}
}

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[{"inputs":[{"internalType":"address","name":"settlement_","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"NotASettlement","type":"error"},{"inputs":[{"components":[{"internalType":"address","name":"target","type":"address"},{"internalType":"bytes","name":"callData","type":"bytes"},{"internalType":"uint256","name":"gasLimit","type":"uint256"}],"internalType":"struct HooksTrampoline.Hook[]","name":"hooks","type":"tuple[]"}],"name":"execute","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"settlement","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"}]

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0x608060405234801561000f575f80fd5b5060043610610034575f3560e01c80635116063014610038578063760f2a0b14610088575b5f80fd5b61005f7f0000000000000000000000009008d19f58aabd9ed0d60971565aa8510560ab4181565b60405173ffffffffffffffffffffffffffffffffffffffff909116815260200160405180910390f35b61009b6100963660046101d6565b61009d565b005b3373ffffffffffffffffffffffffffffffffffffffff7f0000000000000000000000009008d19f58aabd9ed0d60971565aa8510560ab41161461010c576040517f0cd41ec000000000000000000000000000000000000000000000000000000000815260040160405180910390fd5b365f5b828110156101d05783838281811061012957610129610245565b905060200281019061013b9190610272565b91505f61014b60208401846102ae565b73ffffffffffffffffffffffffffffffffffffffff16604084013561017360208601866102e8565b604051610181929190610350565b5f604051808303815f8787f1925050503d805f81146101bb576040519150601f19603f3d011682016040523d82523d5f602084013e6101c0565b606091505b505090505080600101905061010f565b50505050565b5f80602083850312156101e7575f80fd5b823567ffffffffffffffff808211156101fe575f80fd5b818501915085601f830112610211575f80fd5b81358181111561021f575f80fd5b8660208260051b8501011115610233575f80fd5b60209290920196919550909350505050565b7f4e487b71000000000000000000000000000000000000000000000000000000005f52603260045260245ffd5b5f82357fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffa18336030181126102a4575f80fd5b9190910192915050565b5f602082840312156102be575f80fd5b813573ffffffffffffffffffffffffffffffffffffffff811681146102e1575f80fd5b9392505050565b5f8083357fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe184360301811261031b575f80fd5b83018035915067ffffffffffffffff821115610335575f80fd5b602001915036819003821315610349575f80fd5b9250929050565b818382375f910190815291905056fea264697066735822122048824f9c095935f2330d7ea74847fe7fb85f0c3252be801ec53d992478da430864736f6c63430008140033

0000000000000000000000009008d19f58aabd9ed0d60971565aa8510560ab41

-----Decoded View---------------
Arg [0] : settlement_ (address): 0x9008D19f58AAbD9eD0D60971565AA8510560ab41

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 0000000000000000000000009008d19f58aabd9ed0d60971565aa8510560ab41