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

#matches(password) ⇒ Object 



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# File 'lib/zxcvbn/matchers/sequences.rb', line 10

def matches(password)
  result = []
  i = 0
  while i < password.length-1
    j = i + 1
    seq = nil # either lower, upper, or digits
    seq_name = nil
    seq_direction = nil # 1 for ascending seq abcd, -1 for dcba
    SEQUENCES.each do |seq_candidate_name, seq_candidate|
      seq = nil

      i_n, j_n = [password[i], password[j]].map do |chr|
        chr ? seq_candidate.index(chr) : nil
      end

      if i_n && j_n && i_n > -1 && j_n > -1
        direction = j_n - i_n
        if [1, -1].include?(direction)
          seq = seq_candidate
          seq_name = seq_candidate_name
          seq_direction = direction
        end
      end
      if seq
        loop do
          prev_char, cur_char = password[(j-1)], password[j]
          prev_n, cur_n = [prev_char, cur_char].map do |chr|
            chr ? seq_candidate.index(chr) : nil
          end
          if prev_n && cur_n && cur_n - prev_n == seq_direction
            j += 1
          else
            if j - i > 2 # don't consider length 1 or 2 chains.
              result << Match.new(
                :pattern => 'sequence',
                :i => i,
                :j => j-1,
                :token => password[i...j],
                :sequence_name => seq_name,
                :sequence_space => seq.length,
                :ascending => seq_direction == 1
              )
            end
            break
          end
        end
      end
    end
    i = j
  end
  result
end