Class: Qualys::Asset::Evidence

Inherits:
Object
  • Object
show all
Defined in:
lib/qualys/asset/evidence.rb

Overview

This class represents each of the ASSET_DATA_REPORT/GLOSSARY/VULN_INFO_LIST/ VULN_INFO elements in the Qualys Asset 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) ⇒ Evidence

Accepts an XML node from Nokogiri::XML.



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# File 'lib/qualys/asset/evidence.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/qualys/asset/evidence.rb', line 41

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

  process_field_value(method.to_s)
end

Instance Method Details

#process_field_value(method) ⇒ Object 



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# File 'lib/qualys/asset/evidence.rb', line 54

def process_field_value(method)
  tag = @xml.at_xpath("./#{method.upcase}")

  if tag && !tag.text.blank?
    if tags_with_html_content.include?(method)
      Qualys.cleanup_html(tag.text)
    else
      tag.text
    end
  else
    'n/a'
  end
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/qualys/asset/evidence.rb', line 30

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/qualys/asset/evidence.rb', line 18

def supported_tags
  [
    # simple tags
    :first_round, :last_round, :result, :ssl, :times_found,
    :type, :vuln_status,

    :cvss_base, :cvss3_final
  ]
end