Class: Datadog::AppSec::Contrib::Rack::RequestMiddleware

Inherits:
Object
  • Object
show all
Defined in:
lib/datadog/appsec/contrib/rack/request_middleware.rb

Overview

Topmost Rack middleware for AppSec This should be inserted just below Datadog::Tracing::Contrib::Rack::TraceMiddleware

Instance Method Summary collapse

Constructor Details

#initialize(app, opt = {}) ⇒ RequestMiddleware

Returns a new instance of RequestMiddleware.



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# File 'lib/datadog/appsec/contrib/rack/request_middleware.rb', line 20

def initialize(app, opt = {})
  @app = app

  @oneshot_tags_sent = false
end

Instance Method Details

#call(env) ⇒ Object

rubocop:disable Metrics/AbcSize,Metrics/PerceivedComplexity,Metrics/CyclomaticComplexity,Metrics/MethodLength



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# File 'lib/datadog/appsec/contrib/rack/request_middleware.rb', line 27

def call(env)
  return @app.call(env) unless Datadog::AppSec.enabled?

  Datadog::Core::Remote.active_remote.barrier(:once) unless Datadog::Core::Remote.active_remote.nil?
  processor = Datadog::AppSec.processor

  processor = nil
  ready = false
  context = nil

  Datadog::AppSec.reconfigure_lock do
    processor = Datadog::AppSec.processor

    if !processor.nil? && processor.ready?
      context = processor.activate_context
      env['datadog.waf.context'] = context
      ready = true
    end
  end

  # TODO: handle exceptions, except for @app.call

  return @app.call(env) unless ready

  gateway_request = Gateway::Request.new(env)

  add_appsec_tags(processor, active_trace, active_span, env)

  request_return, request_response = catch(::Datadog::AppSec::Ext::INTERRUPT) do
    Instrumentation.gateway.push('rack.request', gateway_request) do
      @app.call(env)
    end
  end

  if request_response && request_response.any? { |action, _event| action == :block }
    request_return = AppSec::Response.negotiate(env).to_rack
  end

  gateway_response = Gateway::Response.new(
    request_return[2],
    request_return[0],
    request_return[1],
    active_context: context
  )

  _response_return, response_response = Instrumentation.gateway.push('rack.response', gateway_response)

  context.events.each do |e|
    e[:response] ||= gateway_response
    e[:request]  ||= gateway_request
  end

  AppSec::Event.record(*context.events)

  if response_response && response_response.any? { |action, _event| action == :block }
    request_return = AppSec::Response.negotiate(env).to_rack
  end

  request_return
ensure
  if context
    add_waf_runtime_tags(active_trace, context)
    processor.deactivate_context
  end
end