Class: StrongPassword::EntropyCalculator::EntropyResolver

Inherits:
Object
  • Object
show all
Defined in:
lib/strong_password/entropy_calculator.rb

Constant Summary collapse

BASE_VALUE = 
1
REPEAT_WEAKENING_FACTOR = 
0.75

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ EntropyResolver

Returns a new instance of EntropyResolver.



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# File 'lib/strong_password/entropy_calculator.rb', line 60

def initialize
  @char_multiplier = {}
end

Instance Attribute Details

#char_multiplier ⇒ Object (readonly)

Returns the value of attribute char_multiplier.



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# File 'lib/strong_password/entropy_calculator.rb', line 58

def char_multiplier
  @char_multiplier
end

Instance Method Details

#entropy_for(char) ⇒ Object

Returns the current entropy value for a character and weakens the entropy for future calls for the same character.



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# File 'lib/strong_password/entropy_calculator.rb', line 66

def entropy_for(char)
  ordinal_value = char.ord
  char_multiplier[ordinal_value] ||= BASE_VALUE
  char_value = char_multiplier[ordinal_value]
  # Weaken the value of this character for future occurrances
  char_multiplier[ordinal_value] = char_multiplier[ordinal_value] * REPEAT_WEAKENING_FACTOR
  return char_value
end