Class: Zxcvbn::Matchers::Sequences

Inherits:
Object
  • Object
show all
Defined in:
lib/zxcvbn/matchers/sequences.rb

Constant Summary collapse

SEQUENCES = 
{
  'lower' => 'abcdefghijklmnopqrstuvwxyz',
  'upper' => 'ABCDEFGHIJKLMNOPQRSTUVWXYZ',
  'digits' => '01234567890'
}

Instance Method Summary collapse

Instance Method Details

#applicable_sequence(password, i) ⇒ Object

find the first matching sequence, and return with direction, if characters are one apart in the sequence



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# File 'lib/zxcvbn/matchers/sequences.rb', line 24

def applicable_sequence(password, i)
  SEQUENCES.each do |name, sequence|
    index1 = sequence.index(password[i])
    index2 = sequence.index(password[i+1])
    if index1 and index2
      seq_direction = index2 - index1
      if [-1, 1].include?(seq_direction)
        return [name, sequence, seq_direction]
      else
        return nil
      end
    end
  end
end

#matches(password) ⇒ Object 



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# File 'lib/zxcvbn/matchers/sequences.rb', line 39

def matches(password)
  result = []
  i = 0
  while i < password.length - 1
    seq_name, seq, seq_direction = applicable_sequence(password, i)

    if seq
      length = seq_match_length(password, i, seq_direction, seq)
      if length > 2
        result << Match.new(
          :pattern => 'sequence',
          :i => i,
          :j => i + length - 1,
          :token => password[i, length],
          :sequence_name => seq_name,
          :sequence_space => seq.length,
          :ascending => seq_direction == 1
        )
      end
      i += length - 1
    else
      i += 1
    end
  end
  result
end

#seq_match_length(password, from, direction, seq) ⇒ Object 



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# File 'lib/zxcvbn/matchers/sequences.rb', line 12

def seq_match_length(password, from, direction, seq)
  index_from = seq.index(password[from])
  j = 1
  while from + j < password.length &&
        password[from + j] == seq[index_from + direction * j]
    j+= 1
  end
  j
end