Class: PwGen

Inherits:
Object
  • Object
show all
Defined in:
lib/ppg/pwgen.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(length, phonemes = nil) ⇒ PwGen

Returns a new instance of PwGen.



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# File 'lib/ppg/pwgen.rb', line 13

def initialize(length, phonemes = nil)
  @password = Password.new(length)
  @phonemes = phonemes || Phonemes.new
  @mutators = {}

  #TODO: избавиться от константы
  @dipthong_length = 2
end

Instance Attribute Details

#password ⇒ Object (readonly)

Returns the value of attribute password.



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# File 'lib/ppg/pwgen.rb', line 10

def password
  @password
end

#phonemes=(value) ⇒ Object (writeonly)

Sets the attribute phonemes

Parameters:

  • value —

    the value to set the attribute phonemes to.



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# File 'lib/ppg/pwgen.rb', line 11

def phonemes=(value)
  @phonemes = value
end

Instance Method Details

#add_mutator(count, proc) ⇒ Object 



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# File 'lib/ppg/pwgen.rb', line 22

def add_mutator(count, proc)
  @mutated_chars ||= []
  @clean_chars_left ||= @password.PASSWORD_LENGTH

  return false if count == 0

  if @clean_chars_left == 0
    count = 0
    raise MutatorError, "nothing left to mutate, rejecting!"
  end

  unless proc.respond_to? :call
    raise MutatorError, "mutator's not callable, rejecting!"
  end

  if count > @clean_chars_left
    error_string = "can't mutate #{count} characters, decreasing to #{@clean_chars_left}!\n"
    count = @clean_chars_left
    raise MutatorError, error_string
  end

  @clean_chars_left -= count
  @mutators[proc] = count
  true

rescue MutatorError
  STDERR << $!.message
  retry

end

#fill_in_password_pattern! ⇒ Object 



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# File 'lib/ppg/pwgen.rb', line 60

def fill_in_password_pattern!
  @password.password_pattern.each do |pattern|
    if pattern.kind_of?(Symbol)
      elem = @phonemes[pattern][SecureRandom.random_number(@phonemes[pattern].length)]
    else pattern.kind_of?(Array)
      # most definitely is dipthong
      length = @phonemes[pattern[0]][pattern[1]].length
      elem = @phonemes[pattern[0]][pattern[1]][SecureRandom.random_number(length)]
    end
    @password.password << elem
  end
  self
end

#generate_password ⇒ Object 



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# File 'lib/ppg/pwgen.rb', line 53

def generate_password
  generate_password_pattern!
    .fill_in_password_pattern!
    .mutate!
  @password
end

#generate_password_pattern! ⇒ Object 



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# File 'lib/ppg/pwgen.rb', line 74

def generate_password_pattern!
  length_left = @password.PASSWORD_LENGTH
  next_pattern = previous_pattern = nil
  can_be_next_patterns = @phonemes.keys
  selector_block = Proc.new { |pattern|
    pattern if pattern != next_pattern || pattern == :dipthong 
  }
  while length_left > 0 do
    loop do
      next_pattern = generate_random_pattern(can_be_next_patterns)
      break unless requirements_not_met?(next_pattern,
        previous_pattern, length_left)        
    end

    can_be_next_patterns.select! &selector_block

    can_be_next_patterns << previous_pattern if previous_pattern != nil

    if next_pattern == :dipthong
      if @password.password_pattern.empty? #first element
        auxiliary_pattern = generate_random_pattern([:vowel, :consonant])
      else
        auxiliary_pattern = 
          case previous_pattern
          when :vowel then :consonant
          when :consonant then :vowel
          end
      end
      next_pattern = next_pattern, auxiliary_pattern
      can_be_next_patterns -= [auxiliary_pattern]
      length_left -= @dipthong_length
      previous_pattern = auxiliary_pattern

    else
      length_left -= 1
      previous_pattern = next_pattern

    end
    @password.password_pattern << next_pattern
  end
  self
end

#mutate! ⇒ Object 



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# File 'lib/ppg/pwgen.rb', line 117

def mutate!
  @mutators.each_pair do |mutator, count| 
    while count > 0
      loop do
        index = SecureRandom.random_number(@password.PASSWORD_LENGTH)
        next unless @password.password[index] =~ @phonemes.downcase_regexp
        @password.password[index] = (mutator.call @password.password[index])
        break
      end
      count -= 1
    end 
  end
end