A hard mod rewriting issue !

Hello !

I am a PHP intermediate programmer. But I don't know anything about htaccess.

Here is what I need :

###################

What you need to know :

1 - My members section is protected with http authentification. I use htaccess.

Here is what I need :

I have a flat file of banned usernames located in this directory :

/www/path/website/ban.dat

In my htaccess file, after the authentication, I need a conditional mod rewrite to look in the ban.dat file... If the username is in the ban.dat file, I need then the user to get redirected here : http://www.domain_name.com/ban.htm?{username}

#############################################

The nearest I got is this... But it doesn't work !



AddType application/x-httpd-php .html .htm
AddType text/html .html


Options FollowSymLinks
ErrorDocument 404 /index.htm

Order Deny,Allow
Deny from All

AuthUserFile /www/server/www.domain-name/cgi-bin/test/.htpasswd
AuthName MEMBERS
AuthType Basic

Options +Includes
AddHandler server-parsed .html

<Limit GET POST>
require valid-user
Satisfy Any
</Limit>


RewriteEngine on

RewriteCond %{IS_SUBREQ} ^false [NC]
RewriteCond %{HTTP:Authorization} ^basic [NC]
RewriteCond /www/path/website/ban.dat%{LA-U:REMOTE_USER} -f
RewriteRule (.*) http://www.domain_name.com/ban.htm?User=%{LA-U:REMOTE_USER}


I have been looking for 3 entire days now... from 8 AM to 10 PM !!!
I would really be great if you could come up with a direct solution and no hints... My goal is not to learn htaccess coding but to solve this problem !!
:p

Thanks !
Marco


P.S.: For some reasons, I need this to be in the htaccess file. I know I can code this in PHP but that is not what I need at this moment. :)