Module: HEITT::Scanner

Defined in:
lib/heitt/scanner.rb

Class Method Summary collapse

Class Method Details

.get_modes(entry) ⇒ Object 



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# File 'lib/heitt/scanner.rb', line 60

def self.get_modes(entry)
  entry[:modes] || entry[:algorithms] || entry[:hashes] || 
  entry[:candidates] || entry[:types] || entry[:hashtypes]
end

.get_regex(entry) ⇒ Object 



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# File 'lib/heitt/scanner.rb', line 56

def self.get_regex(entry)
  entry[:extract_regex] || entry[:regex] || entry[:pattern] || entry[:regexp]
end

.scan(input, database: HEITT::DATABASE, profiles: HEITT::PROFILES, min_entropy: 3.5) ⇒ Object 



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# File 'lib/heitt/scanner.rb', line 10

def self.scan(input, database: HEITT::DATABASE, profiles: HEITT::PROFILES, min_entropy: 3.5)
  text = File.exist?(File.expand_path(input)) ? File.read(File.expand_path(input)) : input
  context_scores = HEITT::Analyzer.analyze(text, profiles: profiles)#database: database)
  found = {}
  #seen = {}
 

  database.each do |entry|
    regex = get_regex(entry)
    modes = get_modes(entry)
    next unless regex && modes && !modes.empty?
    pattern = regex.is_a?(Regexp) ? regex : Regexp.new(regex)
    scanner = StringScanner.new(text)      
    
    while scanner.scan_until(pattern)
      matched = scanner.matched 
      next unless matched.length < 8 || HEITT::Analyzer.high_entropy?(matched, min_entropy)
      offset = scanner.pos - matched.length
      HEITT::Logger.debug("Extracting prefix..")
      delim_prefix = HEITT::Analyzer.extract_prefix(text, offset)
      HEITT::Logger.debug("Extracted prefix: #{delim_prefix.length <= 1 ? "NULL" : delim_prefix}")

      candidates = HEITT::Analyzer.score_candidates(modes, delim_prefix, context_scores)
      #score = candidates.first[:score]

      found[matched] ||= {hash: matched, candidates: []}
      found[matched][:candidates].concat(candidates)
      end
    end

      found.each_value do |result|
       result[:candidates] = result[:candidates]
        .group_by {|c| c[:name]}
        .map {|name, dupes| dupes.max_by {|c| c[:score]}}
        .sort_by {|c| -c[:score]}

        # Re-assign confidence based on final merged scores
        scores_hash = result[:candidates].map {|c| [c[:name], c[:score]]}.to_h
        confidences = Analyzer.assign_confidence(scores_hash)
        result[:candidates] = result[:candidates].map {|c| c.merge(confidence: confidences[c[:name]])}
  end
  found.values
end