Class: Qualys::Element

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

Overview

This class represents each of the /SCAN/IP//CAT/ elements in the Qualys 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.

Constant Summary collapse

SSL_CIPHER_VULN_IDS = 
%w[38140 38141 42366 86729].freeze

Instance Method Summary collapse

Constructor Details

#initialize(xml_node) ⇒ Element

Accepts an XML node from Nokogiri::XML.



37
38
39
 
# File 'lib/qualys/element.rb', line 37

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.



73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
 
# File 'lib/qualys/element.rb', line 73

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 = {
  #   :nexpose_id => 'id',
  #   :pci_severity => 'pciSeverity',
  #   :cvss_score => 'cvssScore',
  #   :cvss_vector =>'cvssVector'
  # }
  #
  # method_name = translations_table.fetch(method, method.to_s)
  method_name = method.to_s
  return @xml.attributes[method_name].value if @xml.attributes.key?(method_name)

  tag = @xml.at_xpath("./#{method_name.upcase}")
  if method_name == 'qualys_collection'
    @xml.name
  elsif tag && !tag.text.blank?
    vuln_id = @xml.attributes['number'].to_s
    cleanup_tag(method, vuln_id, tag.text)
  else
    # nothing found, the tag is valid but not present in this ReportItem
    return nil
  end
end

Instance Method Details

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

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

Returns:

  • (Boolean) 


62
63
64
65
 
# File 'lib/qualys/element.rb', line 62

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/>)



43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
 
# File 'lib/qualys/element.rb', line 43

def supported_tags
  [
    # attributes
    :number, :severity, :cveid,

    # simple tags
    :title, :last_update, :cvss_base, :cvss_temporal, :pci_flag, :diagnosis,
    :consequence, :solution, :compliance, :result,

    # multiple tags
    :vendor_reference_list, :cve_id_list, :bugtraq_id_list,

    # category
    :qualys_collection
  ]
end