Blind Chat Messages

Anyone have good examples of creating a chat message that should only be visible to a connected GM, but might be created by any connected client?

What I've got:

    const messageData = {
      whisper: ChatMessage.getWhisperRecipients('gm'),
      blind: !game.user.isGM,
      user: game.user.data._id,
      type: CONST.CHAT_MESSAGE_TYPES.WHISPER,
      speaker: { alias: game.i18n.localize(`${this.MODULE_NAME}.MESSAGE_HEADER`) },
      content: html,
    }

however, the created chat message is visible plain as day to the creator

It looks to me like ChatMessage.isVisible makes a chat message visible to the creating user always (comments mine):

  get visible() {
    // if this has whisper recipients
    if ( this.data.whisper.length ) {
      // if its a roll, always yes (`isContentVisible` has more rules)
      if ( this.data.type === CONST.CHAT_MESSAGE_TYPES.ROLL ) return true;

      // if this chat message's user is the same as the logged in user --> true
      // or if the logged in user matches one of the recipients
      return (this.data.user === game.user.id) || (this.data.whisper.indexOf(game.user.id) !== -1);
    }
    return true;
  }

Trying to feed the api the GM's user id as speaker makes an error that the user lacks permission

Looks like this isn't strictly possible...

https://gitlab.com/foundrynet/foundryvtt/-/issues/4317

workaround time

You need to hook into renderChatMessage and do html.remove() for non-GMs or something.

Or possibly just hide them, in case Foundry gets huffy about the DOM element being missing.

If I put a flag to help distinguish which cards are mine, I can catch them in a renderChatMessage hook and nuke them yeah.

Hiding them is probably a better play

which would be easiest if I can set a class on the overall chat message instead of just its contents

cssClass on messageData?

noope

:has would solve me... https://caniuse.com/css-has

renderChatMessage happens before the chat message is actually visible, so as long as you aren't turning the hook async, you can modify it all you like before it gets shown.

Yeah I ended up adding a class to the html in the hook if the message has my flag.

It's annoying to me that I need to make code which runs on every message to affect only mine though.

I gave my thumbsup to the issue I linked.

@drl2 you might find this thread insightful