nginx vulnerability scanner

I recently changed servers from Apache to Nginx… How do I write this information (.htaccess) a simple redirect against web scanner on file nginx.conf:

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} ^w3af.sourceforge.net [NC,OR]
RewriteCond %{HTTP_USER_AGENT} dirbuster [NC,OR]
RewriteCond %{HTTP_USER_AGENT} nikto [NC,OR]
RewriteCond %{HTTP_USER_AGENT} wpscan [NC,OR]
RewriteCond %{HTTP_USER_AGENT} SF [OR]
RewriteCond %{HTTP_USER_AGENT} sqlmap [NC,OR]
RewriteCond %{HTTP_USER_AGENT} fimap [NC,OR]
RewriteCond %{HTTP_USER_AGENT} nessus [NC,OR]
RewriteCond %{HTTP_USER_AGENT} whatweb [NC,OR]
RewriteCond %{HTTP_USER_AGENT} Openvas [NC,OR]
RewriteCond %{HTTP_USER_AGENT} jbrofuzz [NC,OR]
RewriteCond %{HTTP_USER_AGENT} libwhisker [NC,OR]
RewriteCond %{HTTP_USER_AGENT} webshag [NC,OR]
RewriteCond %{HTTP:Acunetix-Product} ^WVS
RewriteRule ^.* http://127.0.0.1/ [R=301,L]
</IfModule>

Thank you!