App\Libraries\OsuAuthorize::checkChatChannelRead PHP Method

    public function checkChatChannelRead($user, $channel)
    {
        $prefix = 'chat.channel.read.';
        switch (strtolower($channel->type)) {
            case 'public':
                return 'ok';
            case 'private':
                $commonGroupIds = array_intersect($user->groupIds(), $channel->allowed_groups);
                if (count($commonGroupIds) > 0) {
                    return 'ok';
                }
                break;
            case 'spectator':
            case 'multiplayer':
            case 'temporary':
                // this and the comparisons below are needed until bancho is updated to use the new channel types
                if (starts_with($channel->name, '#spect_')) {
                    return 'ok';
                }
                if (starts_with($channel->name, '#mp_')) {
                    $matchId = intval(str_replace('#mp_', '', $channel->name));
                    if (in_array($user->user_id, MultiplayerMatch::findOrFail($matchId)->currentPlayers(), true)) {
                        return 'ok';
                    }
                }
                break;
        }
        return $prefix . 'no_access';
    }