Email id token encode/decode method

gistfile1.txt

  def self.get_guid record_id
    str = record_id.to_s(36)
    hash = (Digest::SHA1.hexdigest "SALTY#{record_id}HASH")[0..3].downcase
    "[#{hash}#{str}]"
  end

  def self.get_id_for_guid guid
    old_hash = guid[0..3]
    record_id = guid[4..-1].to_i(36)
    hash = (Digest::SHA1.hexdigest "SALTY#{record_id}HASH")[0..3].downcase
    if hash == old_hash
      record_id
    else
      nil
    end
  end