Class: Otto::Security::RateLimiting

Inherits:
Object
  • Object
show all
Defined in:
lib/otto/security/rate_limiter.rb

Overview

Rate limiting implementation using Rack::Attack

Direct Known Subclasses

MCP::RateLimiter

Class Method Summary collapse

Class Method Details

.configure_rack_attack!(config = {}) ⇒ Object 



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# File 'lib/otto/security/rate_limiter.rb', line 17

def self.configure_rack_attack!(config = {})
  return unless defined?(Rack::Attack)

  # Use provided cache store or default
  Rack::Attack.cache.store = config[:cache_store] if config[:cache_store]

  # Default rules
  default_requests_per_minute = config.fetch(:requests_per_minute, 100)

  # General request throttling
  Rack::Attack.throttle('requests', limit: default_requests_per_minute, period: 60) do |request|
    request.ip unless request.path.start_with?('/_') # Skip internal paths by default
  end

  # Apply custom rules if provided
  if config[:custom_rules]
    config[:custom_rules].each do |name, rule_config|
      limit = rule_config[:limit]
      period = rule_config[:period] || 60
      condition = rule_config[:condition]

      Rack::Attack.throttle(name.to_s, limit: limit, period: period) do |request|
        if condition
          request.ip if condition.call(request)
        else
          request.ip
        end
      end
    end
  end

  # Custom response for rate limited requests
  Rack::Attack.throttled_responder = lambda do |request|
    match_data = request.env['rack.attack.match_data']
    now = match_data[:epoch_time]

    headers = {
      'content-type' => 'application/json',
      'retry-after' => (match_data[:period] - (now % match_data[:period])).to_s,
    }

    # Content negotiation for rate limit response
    # Route's response_type takes precedence over Accept header
    route_def = request.env['otto.route_definition']
    wants_json = (route_def&.response_type == 'json') ||
                 request.env['HTTP_ACCEPT'].to_s.include?('application/json')

    if wants_json
      error_response = {
        error: 'Rate limit exceeded',
        message: 'Too many requests',
        retry_after: headers['retry-after'].to_i,
        limit: match_data[:limit],
        period: match_data[:period],
      }
      [429, headers, [JSON.generate(error_response)]]
    else
      body = "Rate limit exceeded. Retry after #{headers['retry-after']} seconds."
      headers['content-type'] = 'text/plain'
      [429, headers, [body]]
    end
  end

  # Log blocked requests if ActiveSupport is available
  return unless defined?(ActiveSupport::Notifications)

  ActiveSupport::Notifications.subscribe('rack.attack') do |_name, _start, _finish, _request_id, payload|
    req = payload[:request]
    Otto.logger.warn "[Otto] Rate limit #{payload[:match_type]} for #{req.ip}: #{payload[:matched]}"
  end
end