rate limiter

app/controllers/concerns/rate_limiter.rb

@@ -0,0 +1,45 @@
+module RateLimiter
+  extend ActiveSupport::Concern
+
+  included do
+    before_action :check_rate_limit, only: [:create]
+  end
+
+  private
+
+  def check_rate_limit
+    identifier = request.ip
+    cache_key = "rate_limit:#{controller_name}:#{identifier}"
+
+    # Get current attempt count
+    attempts = Rails.cache.read(cache_key) || 0
+
+    if attempts >= max_attempts
+      @rate_limited = true
+      render_rate_limit_error
+      return
+    end
+
+    # Increment attempt count with expiry
+    Rails.cache.write(cache_key, attempts + 1, expires_in: lockout_period)
+  end
+
+  def reset_rate_limit
+    identifier = request.ip
+    cache_key = "rate_limit:#{controller_name}:#{identifier}"
+    Rails.cache.delete(cache_key)
+  end
+
+  def render_rate_limit_error
+    flash.now[:alert] = "Too many failed attempts. Please try again in #{lockout_period / 60} minutes."
+    render action_name == "create" ? :new : action_name, status: :too_many_requests
+  end
+
+  def max_attempts
+    5
+  end
+
+  def lockout_period
+    15.minutes
+  end
+end