Module: Passw

Defined in:
lib/passw.rb

Class Method Summary collapse

Class Method Details

.generate(length, options = {}) ⇒ Object

Generate a password with the sepecified options Params:

length

the length of the password

options

a hash defining the attributes for the password



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# File 'lib/passw.rb', line 6

def self.generate(length, options = {})
  defaults = {
    lowercase:  true, # Allow lower case characters
    uppercase:  true, # Allow uppercase characters
    symbols:    true, # Allow symbols
    numbers:    true, # Allow numbers 
    duplicates: true  # Allow characters to be duplicated (less secure if true)
  }
  
  defaults.merge!(options)
  
  buffer = []
  
  buffer += lowercase if defaults[:lowercase]
  buffer += uppercase if defaults[:uppercase]
  buffer += symbols   if defaults[:symbols]
  buffer += numbers   if defaults[:numbers]
  
  base = []
  
  buffer_length = buffer.length

  (0...length.to_i).each do |i|
    if defaults[:duplicates]
      base << buffer[srand % buffer_length]
    else
      loop do
        candidate = buffer[srand % buffer_length]
        
        if !base.include? candidate
          base << candidate
          break
        end
        
        # Ensure that this loop does not run forever if duplicates are disallowed
        # In this case, we're limited to the collective size of buffered characters
        
        break if base.length == buffer_length - 1
      end
    end
  end
  
  base.shuffle.join
end