[rin]

Hi Andrew, thanks for your reply.
Since most of the attachments are pictures and less than 200KB in filesize, I wouldn't mind broken transfers. If in the membership plan 10MB bandwidth are mentioned, I would secretly allow members a bandwidth consumption of around 15MB to avoid situations like that.
I would reduce usergroups to the basic ones and don't let members have multiple usergroups.
In my case those would simply be: Banned and Guests (no access anyway), Unsubscribed, Subscribed, Actives and the obvious i.e. Moderators and Administrators.

Because I am thinking about a subscription plan for my website. So I need to make it more valueable for members to pay a sum once in a while. I want to achieve that by giving users bandwith (or not).

I have further worked on it:

if($vbulletin->userinfo['usergroupid'] = 6) { $limitation = 1; }

$result = $db->query_read("SELECT current_bandwidth FROM " . TABLE_PREFIX . "user WHERE userid = $vbulletin->userinfo[userid]); // Get the current bandwidth usage
$current_quota = $result['current_bandwidth'] + $attachmentinfo['filesize'];  // Calculate the current quota being used including the file which the user wants to download now.

if($current_quota < $limitation)
{
 SHOW ATTACHMENT
}
else
{
 DON'T SHOW ATTACHMENT
}
$db_query_write("UPDATE " . TABLE_PREFIX . "user SET current_bandwidth = $current_quota WHERE userid = $vbulletin->userinfo['userid']");

I am going to try this out on my test-installation now. But I am sure it will be broken in one way or another.
So please, if by looking over the code you find anything which doesn't match up, I hope you can help me.
Cheers

--------------- Added [DATE]1250419067[/DATE] at [TIME]1250419067[/TIME] ---------------

As predicted, it doesn't work.
When opening attachments, it will not write the quota into the database.
I use the "attachment_start" hook.

--------------- Added [DATE]1250431666[/DATE] at [TIME]1250431666[/TIME] ---------------

Strange enough, even if I active the following plugin, all thumbnails and attachments are broken.

$db->query_write("
			UPDATE " . TABLE_PREFIX . "user SET
				current_bandwidth = 10
			WHERE userid = $vbulletin->userinfo[userid]
		");

I have used attachment_start and attachment_display as hooks.