Class: Nexpose::Node

Inherits:
Object
  • Object
show all
Defined in:
lib/nexpose/node.rb

Overview

This class represents each of the /NexposeReport/nodes/node elements in the Nexpose Full XML document.

It provides a convenient way to access the information scattered all over the XML in attributes and nested tags.

Instead of providing separate methods for each supported property we rely on Ruby’s #method_missing to do most of the work.

Instance Method Summary collapse

Constructor Details

#initialize(xml_node) ⇒ Node

Accepts an XML node from Nokogiri::XML.



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# File 'lib/nexpose/node.rb', line 12

def initialize(xml_node)
  @xml = xml_node
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method, *args) ⇒ Object

This method is invoked by Ruby when a method that is not defined in this instance is called.

In our case we inspect the @method@ parameter and try to find the attribute, simple descendent or collection that it maps to in the XML tree.



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# File 'lib/nexpose/node.rb', line 59

def method_missing(method, *args)
  # We could remove this check and return nil for any non-recognized tag.
  # The problem would be that it would make tricky to debug problems with
  # typos. For instance: <>.potr would return nil instead of raising an
  # exception
  unless supported_tags.include?(method)
    super
    return
  end

  # First we try the attributes. In Ruby we use snake_case, but in XML
  # hyphenated-case is used for some attributes
  translations_table = {
    device_id: 'device-id',
    hardware_address: 'hardware-address',
    risk_score: 'risk-score',
    site_name: 'site-name'
  }

  method_name = translations_table.fetch(method, method.to_s)
  return @xml.attributes[method_name].value if @xml.attributes.key?(method_name)

  # Then we try simple children tags: description, solution

  # Finally the enumerations: names
  if method_name == 'names'
    @xml.xpath('./names/name').collect(&:text)

  elsif ['fingerprints', 'software'].include?(method_name)

    xpath_selector = {
      'fingerprints' => './fingerprints/os',
      'software' => './software/fingerprint'
    }[method_name]

    xml_os = @xml.at_xpath(xpath_selector)
    return '' if xml_os.nil?

    xml_os.attributes['product'].value
  else
    # nothing found, the tag is valid but not present in this ReportItem
    return nil
  end
end

Instance Method Details

#endpoints ⇒ Object

Each of the endpoints associated with this node. Returns an array of Nexpose::Endpoint objects



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# File 'lib/nexpose/node.rb', line 42

def endpoints
  @xml.xpath('./endpoints/endpoint').collect { |xml_endpoint| Endpoint.new(xml_endpoint) }
end

#respond_to?(method, include_private = false) ⇒ Boolean

This allows external callers (and specs) to check for implemented properties

Returns:

  • (Boolean) 


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# File 'lib/nexpose/node.rb', line 48

def respond_to?(method, include_private = false)
  return true if supported_tags.include?(method.to_sym)
  super
end

#supported_tags ⇒ Object

List of supported tags. They can be attributes, simple descendans or collections (e.g. <references/>, <tags/>)



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# File 'lib/nexpose/node.rb', line 18

def supported_tags
  [
    # attributes
    :address, :device_id, :hardware_address, :risk_score, :site_name, :status,

    # simple tags

    # multiple tags
    :fingerprints, :names,

    # compounded tags
    :endpoints, :software, :tests
  ]
end

#tests(*args) ⇒ Object

Convert each ./test/test entry into a simple hash



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# File 'lib/nexpose/node.rb', line 34

def tests(*args)
  @xml.xpath('./tests/test').collect do |xml_test|
    Nexpose::Test.new(xml_test)
  end
end