/**
 *Submitted for verification at Sepolia.Arbiscan.io on 2025-02-20
*/

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.27;

interface IERC7786Receiver {
    /**
     * @dev Endpoint for receiving cross-chain message.
     * @param sourceChain {CAIP2} chain identifier
     * @param sender {CAIP10} account address (does not include the chain identifier)
     *
     * This function may be called directly by the gateway.
     */
    function executeMessage(
        string calldata sourceChain, // CAIP-2 chain identifier
        string calldata sender, // CAIP-10 account address (does not include the chain identifier)
        bytes calldata payload,
        bytes[] calldata attributes
    ) external payable returns (bytes4);
}

/**
 * @dev Base implementation of an ERC-7786 compliant cross-chain message receiver.
 *
 * This abstract contract exposes the `executeMessage` function that is used for communication with (one or multiple)
 * destination gateways. This contract leaves two functions unimplemented:
 *
 * {_isKnownGateway}, an internal getter used to verify whether an address is recognised by the contract as a valid
 * ERC-7786 destination gateway. One or multiple gateway can be supported. Note that any malicious address for which
 * this function returns true would be able to impersonate any account on any other chain sending any message.
 *
 * {_processMessage}, the internal function that will be called with any message that has been validated.
 */

 abstract contract ERC7786Receiver is IERC7786Receiver {
    error ERC7786ReceiverInvalidGateway(address gateway);
    error ERC7786ReceivePassiveModeValue();

    /// @inheritdoc IERC7786Receiver
    function executeMessage(
        string calldata source,
        string calldata sender,
        bytes calldata payload,
        bytes[] calldata attributes
    ) public payable virtual returns (bytes4) {
        require(_isKnownGateway(msg.sender), ERC7786ReceiverInvalidGateway(msg.sender));
        _processMessage(msg.sender, source, sender, payload, attributes);
        return IERC7786Receiver.executeMessage.selector;
    }

    /// @dev Virtual getter that returns whether an address is a valid ERC-7786 gateway.
    function _isKnownGateway(address instance) internal view virtual returns (bool);

    /// @dev Virtual function that should contain the logic to execute when a cross-chain message is received.
    function _processMessage(
        address gateway,
        string calldata sourceChain,
        string calldata sender,
        bytes calldata payload,
        bytes[] calldata attributes
    ) internal virtual;
}


contract ERC7786ReceiverMock is ERC7786Receiver {
    address private immutable _gateway;

    event MessageReceived(address gateway, string source, string sender, bytes payload, bytes[] attributes);

    constructor(address gateway_) {
        _gateway = gateway_;
    }

    function _isKnownGateway(address instance) internal view virtual override returns (bool) {
        return instance == _gateway;
    }

    function _processMessage(
        address gateway,
        string calldata source,
        string calldata sender,
        bytes calldata payload,
        bytes[] calldata attributes
    ) internal virtual override {
        emit MessageReceived(gateway, source, sender, payload, attributes);
    }
}

[{"inputs":[{"internalType":"address","name":"gateway_","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"ERC7786ReceivePassiveModeValue","type":"error"},{"inputs":[{"internalType":"address","name":"gateway","type":"address"}],"name":"ERC7786ReceiverInvalidGateway","type":"error"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"gateway","type":"address"},{"indexed":false,"internalType":"string","name":"source","type":"string"},{"indexed":false,"internalType":"string","name":"sender","type":"string"},{"indexed":false,"internalType":"bytes","name":"payload","type":"bytes"},{"indexed":false,"internalType":"bytes[]","name":"attributes","type":"bytes[]"}],"name":"MessageReceived","type":"event"},{"inputs":[{"internalType":"string","name":"source","type":"string"},{"internalType":"string","name":"sender","type":"string"},{"internalType":"bytes","name":"payload","type":"bytes"},{"internalType":"bytes[]","name":"attributes","type":"bytes[]"}],"name":"executeMessage","outputs":[{"internalType":"bytes4","name":"","type":"bytes4"}],"stateMutability":"payable","type":"function"}]

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