feat: allow passing async ability function in channel options

[lukashass]

I'm trying to update the ability for channels by passing a function to channels.makeOptions:

const caslOptions = channels.makeOptions(app, {
  ability: (a, conn) => defineAbilitiesFor(conn.user, a),
});

Since defineAbilitiesFor is async (for querying data needed to create the ability, similar to #31), I added:

• await before calling options.ability
• call to getAbility when options.restrictFields === true

If there is a better way to update stale abilities for channels, any pointers in the right direction would be much appreciated.

[lukashass]

@fratzinger Have you seen this? 😉

[fratzinger]

Thanks for the nudge and sorry for the delay!

If I get it right, making ability async is really not a good idea for channels cause it makes them pretty slow, I can assume.

You can override connection.ability at anytime.

For example, I do this:

  app.on("logout", (payload: any, { connection }) => {
    if (connection) {
      delete connection.ability;
      // you can also do something like:
      // connection.ability = await defineAbility(...);
      app.channel("anonymous").join(connection);
    }
  });

Does that help in any way?