Class: Nexpose::Endpoint

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

Overview

This class represents each of the /NexposeReport/nodes/node/endpoints/endpoint 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) ⇒ Endpoint

Accepts an XML node from Nokogiri::XML.



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# File 'lib/nexpose/endpoint.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/endpoint.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
  # CamelCase is used for some attributes
  translations_table = {}

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

  return nil
end

Instance Method Details

#label ⇒ Object

Save some time with a meta attribute, e.g. 80/tcp (open)



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

def label
  "#{self.port}/#{self.protocol} (#{self.status})"
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/endpoint.rb', line 48

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

#services ⇒ Object

Each of the services associated with this endpoint. Returns an array of Nexpose::Service objects



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# File 'lib/nexpose/endpoint.rb', line 40

def services
  @xml.xpath('./services/service').map do |xml_service|
    Service.new(xml_service, endpoint: { port: port, protocol: protocol })
  end
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/endpoint.rb', line 18

def supported_tags
  [
    # meta
    :label,

    # attributes
    :protocol, :port, :status,

    # simple tags

    # multiple tags
    :services
  ]
end