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Overview

ICallProxy defines the interface for accessing cross-chain execution context. Interface Location: contracts/interfaces/ICallProxy.sol

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View Functions

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submissionChainIdFrom

function submissionChainIdFrom() external view returns (uint256)
Returns the chain ID where the current cross-chain message originated.

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submissionNativeSender

function submissionNativeSender() external view returns (bytes memory)
Returns the original sender address on the source chain (encoded as bytes).

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Usage in Target Contracts

Accessing Context
contract CrossChainReceiver {
    ICallProxy public immutable callProxy;
    
    constructor(address _callProxy) {
        callProxy = ICallProxy(_callProxy);
    }
    
    function handleMessage(uint256 value) external {
        // Only accept calls through CallProxy
        require(msg.sender == address(callProxy), "Not from CallProxy");
        
        // Get cross-chain context
        uint256 sourceChain = callProxy.submissionChainIdFrom();
        bytes memory senderBytes = callProxy.submissionNativeSender();
        address sender = abi.decode(senderBytes, (address));
        
        // Verify authorized sender
        require(authorizedSenders[sourceChain][sender], "Unauthorized");
        
        // Execute logic
        processValue(value);
    }
}

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Security Pattern

Always verify that msg.sender is the CallProxy contract before trusting the context variables.
Security Check
modifier onlyCallProxy() {
    require(msg.sender == address(callProxy), "Only CallProxy");
    _;
}

function crossChainFunction() external onlyCallProxy {
    // Safe to use submissionChainIdFrom and submissionNativeSender
}

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