Contract Source Code (Solidity Standard Json-Input format)

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

/// @title Interface for the Factory contract.
interface IndexInterface {
    /// @notice Get the master address from the Factory contract.
    /// @return The address of the master.
    function master() external view returns (address);
}

/// @title Contract for setting up default and specific function implementations.
contract Setup {
    /// @notice The default implementation address.
    address public defaultImplementation;

    mapping(bytes4 => address) internal sigImplementations;

    mapping(address => bytes4[]) internal implementationSigs;
}

/// @title Contract for managing and updating function implementations.
contract Implementations is Setup {
    /// @notice Event emitted when the default implementation is set.
    event LogSetDefaultImplementation(
        address indexed oldImplementation,
        address indexed newImplementation
    );

    /// @notice Event emitted when a new implementation is added.
    event LogAddImplementation(address indexed implementation, bytes4[] sigs);

    /// @notice Event emitted when an implementation is removed.
    event LogRemoveImplementation(
        address indexed implementation,
        bytes4[] sigs
    );

    /// @notice The Factory contract interface.
    IndexInterface public immutable peerToPlayFactory;

    /// @param _peerToPlayFactory The address of the Factory contract.
    constructor(address _peerToPlayFactory) {
        peerToPlayFactory = IndexInterface(_peerToPlayFactory);
    }

    /// @notice Modifier to check if the caller is the master address.
    modifier isMaster() {
        require(
            msg.sender == peerToPlayFactory.master(),
            "Implementations: not-master"
        );
        _;
    }

    /// @notice Set the default implementation address.
    /// @param _defaultImplementation The address of the new default implementation.
    function setDefaultImplementation(
        address _defaultImplementation
    ) external isMaster {
        require(
            _defaultImplementation != address(0),
            "Implementations: _defaultImplementation address not valid"
        );
        require(
            _defaultImplementation != defaultImplementation,
            "Implementations: _defaultImplementation cannot be same"
        );
        emit LogSetDefaultImplementation(
            defaultImplementation,
            _defaultImplementation
        );
        defaultImplementation = _defaultImplementation;
    }

    /// @notice Add a new implementation.
    /// @param _implementation The address of the new implementation.
    /// @param _sigs The function signatures that should use this implementation.
    function addImplementation(
        address _implementation,
        bytes4[] calldata _sigs
    ) external isMaster {
        require(
            _implementation != address(0),
            "Implementations: _implementation not valid."
        );
        require(
            implementationSigs[_implementation].length == 0,
            "Implementations: _implementation already added."
        );
        for (uint i = 0; i < _sigs.length; i++) {
            bytes4 _sig = _sigs[i];
            require(
                sigImplementations[_sig] == address(0),
                "Implementations: _sig already added"
            );
            sigImplementations[_sig] = _implementation;
        }
        implementationSigs[_implementation] = _sigs;
        emit LogAddImplementation(_implementation, _sigs);
    }

    /// @notice Remove an implementation.
    /// @param _implementation The address of the implementation to remove.
    function removeImplementation(address _implementation) external isMaster {
        require(
            _implementation != address(0),
            "Implementations: _implementation not valid."
        );
        require(
            implementationSigs[_implementation].length != 0,
            "Implementations: _implementation not found."
        );
        bytes4[] memory sigs = implementationSigs[_implementation];
        for (uint i = 0; i < sigs.length; i++) {
            bytes4 sig = sigs[i];
            delete sigImplementations[sig];
        }
        delete implementationSigs[_implementation];
        emit LogRemoveImplementation(_implementation, sigs);
    }
}

/// @title Contract for querying function implementations.
contract PeerToPlayImplementations is Implementations {
    /// @param _peerToPlayFactory The address of the Factory contract.
    constructor(
        address _peerToPlayFactory
    ) Implementations(_peerToPlayFactory) {}

    /// @notice Get the implementation address for a function signature.
    /// @param _sig The function signature to query.
    /// @return The address of the implementation.
    function getImplementation(bytes4 _sig) external view returns (address) {
        address _implementation = sigImplementations[_sig];
        return
            _implementation == address(0)
                ? defaultImplementation
                : _implementation;
    }

    /// @notice Get all function signatures for a given implementation address.
    /// @param _impl The implementation address to query.
    /// @return An array of function signatures.
    function getImplementationSigs(
        address _impl
    ) external view returns (bytes4[] memory) {
        return implementationSigs[_impl];
    }

    /// @notice Get the implementation address for a given function signature.
    /// @param _sig The function signature to query.
    /// @return The address of the implementation.
    function getSigImplementation(bytes4 _sig) external view returns (address) {
        return sigImplementations[_sig];
    }
}

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

[{"inputs":[{"internalType":"address","name":"_peerToPlayFactory","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"implementation","type":"address"},{"indexed":false,"internalType":"bytes4[]","name":"sigs","type":"bytes4[]"}],"name":"LogAddImplementation","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"implementation","type":"address"},{"indexed":false,"internalType":"bytes4[]","name":"sigs","type":"bytes4[]"}],"name":"LogRemoveImplementation","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"oldImplementation","type":"address"},{"indexed":true,"internalType":"address","name":"newImplementation","type":"address"}],"name":"LogSetDefaultImplementation","type":"event"},{"inputs":[{"internalType":"address","name":"_implementation","type":"address"},{"internalType":"bytes4[]","name":"_sigs","type":"bytes4[]"}],"name":"addImplementation","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"defaultImplementation","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes4","name":"_sig","type":"bytes4"}],"name":"getImplementation","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_impl","type":"address"}],"name":"getImplementationSigs","outputs":[{"internalType":"bytes4[]","name":"","type":"bytes4[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes4","name":"_sig","type":"bytes4"}],"name":"getSigImplementation","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"peerToPlayFactory","outputs":[{"internalType":"contract IndexInterface","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_implementation","type":"address"}],"name":"removeImplementation","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_defaultImplementation","type":"address"}],"name":"setDefaultImplementation","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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