class TagSanitizer
  DISALLOWED_STRINGS = %w[? < > = /].freeze

  def sanitize_tag(tag)
    tag = tag.dup
    DISALLOWED_STRINGS.each do |s|
      tag.gsub!(s, "")
    end
    tag.truncate(TagSanitizer.tag_max_length)
  end

  def sanitize_tag_list(tag_list)
    tag_list.map { |tag| sanitize_tag(tag) }
  end

  def self.tag_max_length
    160
  end
end