Validating Messages

Iris protocol does provide simple helpers to validate the message received. Listener.sol in @aurelianoa/iris-channels does have varoius helpers.

Event Index

Every message does have a eventIndex to help diferentiate messages within the same network. Just use the compareIndex helper.

import { Listener } from "@aurelianoa/iris-channels/contracts/listener/Listener.sol";

contract MyListener is Listener {
  
  /// Override the onReceivedMessage function
  function onReceivedMessage(address sender, string memory eventIndex, bytes memory data) internal override {
      /// define your logic based on the eventIndex received
      if(compareIndex(eventIndex, "myEventIndex")) {
          /// process the data if theres any
          /// your logic here
      }
    }
}

Validating the sender

Another important aspect is to validate the Sender of the message (Channel Address). Simply register your channel sender (channel address) in your listener using setChannel and then use the isChannelAvailable.

import { Listener } from "@aurelianoa/iris-channels/contracts/listener/Listener.sol";

contract MyListener is Listener {

  address private owner;

  constructor () {
      owner = msg.sender;
  }

  /// override middleware from Listener.sol with your preferred security strategy
  /// to access setChannel
  function middleware() internal virtual override returns (bool) {
      return msg.sender == owner;
  }
  
  /// Override the onReceivedMessage function
  /// @dev to use isChannelAvailable call setChannel first
  function onReceivedMessage(address sender, string memory eventIndex, bytes memory data) internal override {
      /// define your logic based on the eventIndex received
      if(isChannelAvailable(sender) && compareIndex(eventIndex, "myEventIndex")) {
          /// process the data if theres any
          /// your logic here
      }
    }
}