Cryptographically scramble IPs stored by Neocities

"There is a time when the operation of the machine becomes so odious,
makes you so sick at heart, that you can't take part; you can't even
passively take part, and you've got to put your bodies upon the gears
and upon the wheels, upon the levers, upon all the apparatus, and you've
got to make it stop. And you've got to indicate to the people who run
it, to the people who own it, that unless you're free, the machine will
be prevented from working at all."

Mario Savio
Sproul Hall Steps
University of California, Berkeley
December 3, 1964

app.rb

@@ -1216,8 +1216,7 @@ post '/admin/banip' do
     flash[:error] = 'IP is blank, cannot continue'
     redirect '/admin'
   end
-
-  sites = Site.filter(ip: site.ip, is_banned: false).all
+  sites = Site.filter(ip: Site.hash_ip(site.ip), is_banned: false).all
   sites.each {|s| s.ban!}
   flash[:error] = "#{sites.length} sites have been banned."
   redirect '/admin'
@@ -1495,7 +1494,7 @@ post '/site/:username/report' do |username|
     redirect request.referer if current_site.id == site.id
     report.reporting_site_id = current_site.id
   else
-    report.ip = request.ip
+    report.ip = Site.hash_ip request.ip
   end
 
   report.save
@@ -1533,8 +1532,8 @@ def dashboard_if_signed_in
 end
 
 def require_login_ajax
-  halt 'You are banned.' if Site.banned_ip?(request.ip)
   halt 'You are not logged in!' unless signed_in?
+  halt 'You are banned.' if current_site.is_banned? || parent_site.is_banned?
 end
 
 def csrf_safe?
@@ -1546,8 +1545,11 @@ def csrf_token
 end
 
 def require_login
-  require_unbanned_ip
   redirect '/' unless signed_in?
+  if current_site.is_banned || parent_site.is_banned
+    session[:id] = nil
+    redirect '/'
+  end
 end
 
 def signed_in?