Module: ActionInterceptor::ActionController::ClassMethods

Defined in:
lib/action_interceptor/action_controller.rb

Instance Method Summary collapse

Instance Method Details

#acts_as_interceptor(opts = {}) ⇒ Object 



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# File 'lib/action_interceptor/action_controller.rb', line 97

def acts_as_interceptor(opts = {})
  self.interceptor_config = ActionInterceptor::DEFAULT_CONFIG.merge(opts)

  class_exec do

    attr_writer :intercepted_url

    # Ensure that we always store the intercepted url
    before_filter :intercepted_url

    helper_method :intercepted_url, :intercepted_url_hash

    protected

    def intercepted_url
      return @intercepted_url if @intercepted_url

      key = interceptor_config[:intercepted_url_key]
      encrypted_url = params[key]
      session_hash = session[:interceptor] \
        unless interceptor_config[:skip_session]
      session_hash ||= {}

      begin
        # URL params are the most reliable, as they preserve
        # state even if the user presses the back button
        # We need to sign them to prevent the Open Redirect vulnerability
        @intercepted_url = Encryptor.decrypt_and_verify(encrypted_url)

        # If we got this far, the encrypted url is valid
        # (i.e. we signed it), so reuse it
        @intercepted_url_hash = {key => encrypted_url}
      rescue ActiveSupport::MessageVerifier::InvalidSignature
        # If the param is not available, use our best guess
        # Session and referer are safe for redirects (for that user)
        # Also, can't call root_url here, so use '/' instead
        @intercepted_url = session_hash[key] || request.referer || '/'
      end

      # Prevent self-redirect
      @intercepted_url = '/' if current_page?(@intercepted_url)

      # Session is a signed plaintext in Rails 3
      # In Rails 4, it is encrypted by default
      session[:interceptor] = session_hash.merge(
        key => @intercepted_url
      ) unless interceptor_config[:skip_session]

      @intercepted_url
    end

    def intercepted_url_hash
      # Run intercepted_url to verify the params in case the
      # encrypted url is in there and can be reused
      unencrypted_url = intercepted_url
      return @intercepted_url_hash if @intercepted_url_hash

      url = Encryptor.encrypt_and_sign(unencrypted_url)
      key = interceptor_config[:intercepted_url_key]

      @intercepted_url_hash = {key => url}
    end

    def redirect_back(options = {})
      # Disable the return_to param
      without_interceptor do
        redirect_to intercepted_url, options
      end
    end

  end
end

#interceptor(*interceptor_names, &block) ⇒ Object 



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# File 'lib/action_interceptor/action_controller.rb', line 67

def interceptor(*interceptor_names, &block)
  options = interceptor_names.extract_options!
  filter_name = options.delete(:filter_name)
  fnames = interceptor_names.collect do |iname|
    fname = filter_name || iname
    interceptor_filters[iname] = fname

    define_method fname do
      blk = block || ActionInterceptor.interceptors[iname]
      raise UndefinedInterceptor, iname unless blk

      with_interceptor &blk
    end

    fname
  end

  before_filter *fnames, options
end

#skip_interceptor(*interceptor_names) ⇒ Object 



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# File 'lib/action_interceptor/action_controller.rb', line 87

def skip_interceptor(*interceptor_names)
  options = interceptor_names.extract_options!
  filter_name = options.delete(:filter_name)
  fnames = interceptor_names.collect do |iname|
    filter_name || interceptor_filters[iname] || iname
  end

  skip_before_filter *fnames, options
end