require 'digest/sha1'
#
# A wrapper for generating SHA1 hash value
# Simply done by concatenating all values using the colon symbol for delimiter.
# This algorithm is mostly used by payment gateways.
#
# Usage:
#
#   SHA1Generator.digest('foo', 'bar', 'fizz', 'buzz')
#   => "e723e86a6000fc8462142eb4821672de107535c1"           # 40 chars
#   
#   hash_value = SHA1Generator.new('foo', 'bar', 'fizz', 'buzz')

#   hash_value.digestible_attributes
#   => "foo:bar:fizz:buzz"
#
#   hash_value.digest
#   => "e723e86a6000fc8462142eb4821672de107535c1"           # 40 chars
#
class SHA1Generator

  def self.digest(*attributes)
    new(*attributes).digest
  end

  def initialize(*attributes)
    @attrs = attributes
  end
  
  def digestible_attributes
    @attrs * ":"
  end

  def digest
    Digest::SHA1.hexdigest(digestible_attributes)
  end

end