Adds rack-attack to throttle requests and use memcached for it (#337)

Gemfile

@@ -22,6 +22,7 @@ gem 'omniauth', '1.9.2'
 gem 'omniauth-oauth2'
 gem 'omniauth-rails_csrf_protection'
 gem 'puma', '~> 5.0'
+gem 'rack-attack'
 gem 'rails', '~> 7.0.6'
 gem 'rsolr', '>= 1.0', '< 3'
 gem 'sassc-rails', '~> 2.1'

Gemfile.lock

@@ -377,6 +377,8 @@ GEM
       nio4r (~> 2.0)
     racc (1.8.0)
     rack (2.2.9)
+    rack-attack (6.7.0)
+      rack (>= 1.0, < 4)
     rack-test (2.1.0)
       rack (>= 1.3)
     rails (7.0.8.4)
@@ -597,6 +599,7 @@ DEPENDENCIES
   omniauth-oauth2
   omniauth-rails_csrf_protection
   puma (~> 5.0)
+  rack-attack
   rails (~> 7.0.6)
   rsolr (>= 1.0, < 3)
   rspec-rails

config/environments/production.rb

@@ -56,7 +56,7 @@
   config.log_tags = [ :request_id ]
 
   # Use a different cache store in production.
-  # config.cache_store = :mem_cache_store
+  config.cache_store = :mem_cache_store
 
   # Use a real queuing backend for Active Job (and separate queues per environment).
   # config.active_job.queue_adapter     = :resque

config/initializers/rack_attack.rb

@@ -0,0 +1,8 @@
+class Rack::Attack
+  # Throttle all requests by IP (60rpm)
+  #
+  # Key: "rack::attack:#{Time.now.to_i/:period}:req/ip:#{req.ip}"
+  throttle('req/ip', limit: 300, period: 5.minutes) do |req|
+    req.ip unless req.path.start_with?('/assets')
+  end
+end