Class: RightSupport::Data::Token

Inherits:
Object
  • Object
show all
Defined in:
lib/right_support/data/token.rb

Overview

unique token generator. short tokens that are friendler than raw UUIDs for logging purposes, etc.

Constant Summary collapse

TOKEN_LENGTH =

exact length of all generated tokens.

13

Class Method Summary collapse

Class Method Details

.generate ⇒ String

Generate new token

Returns:



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# File 'lib/right_support/data/token.rb', line 37

def self.generate
  # MD5 is 128bit = 25 chars in base 36, need to fit in less
  # The code below produces a 64 bit value evenly distributed.
  i = ::Digest::MD5.hexdigest(::RightSupport::Data::UUID.generate).to_i(16)
  t = ((i >> 64) ^ (i & 0xFFFFFFFFFFFFFFFF)).to_s(36)

  # left-pad with zeros to keep token length consistant.
  if t.length < TOKEN_LENGTH
    t = '0' * (TOKEN_LENGTH - t.length) + t
  end
  t
end