SimpleSAMLphp log parser

parse_saml_log.rb

require 'nokogiri'

class LogfileParser

  XPATH_QUERY = "Response[@ID][@Version='2.0']"
  SAML_XMLNS  = 'urn:oasis:names:tc:SAML:2.0:assertion'
  SAMLP_XMLNS = 'urn:oasis:names:tc:SAML:2.0:protocol'
  
  def initialize(path, email)
    raise ArgumentError unless File.exists?(path)

    @log = File.open(path, "r")
    @email = email
  end

  def read   
    buffer = false
    lines = []
    @log.each_line { |line|
      resp = line.split(/DEBUG \[[a-z0-9]*\]/)[1]
      buffer = true if (resp && resp[/<samlp:Response xmlns/])
      
      if (resp && resp[/<\/samlp:Response>/])
        lines.push(resp)
        xml = Nokogiri::XML(lines.join())
        xml.xpath(XPATH_QUERY, 'saml' => SAML_XMLNS, 'samlp' => SAMLP_XMLNS)
        begin
          xml.xpath('//saml:Attribute[@Name="TAL:user_id"]').each do |e| 
            puts e.xpath('./saml:AttributeValue').text()
          end
          xml.xpath('//saml:Attribute[@Name="GrouperGroups"]').each do |e| 
            puts e.xpath('./saml:AttributeValue').text()
          end
        rescue
        end
        buffer = false 
        lines = []
      end

      lines.push(resp) if buffer
    }
    @log.close
  end

end

p = LogfileParser.new(ARGV[0], ARGV[1])
p.read()