class RuboCop::Cop::Rails::LinkToBlank

link_to ‘Click here’, url, target: ‘_blank’, rel: ‘noreferrer’
# good
link_to ‘Click here’, url, target: ‘_blank’, rel: ‘noopener’
# good
link_to ‘Click here’, url, target: ‘_blank’
# bad
@example
and removes the http-referrer header.
The option ‘rel: ’noreferrer’‘ also blocks this behavior
and could change its location for phishing purposes.
risk as the loaded page will have control over the previous page
`target: ’_blank’‘ but no `rel: ’noopener’‘. This can be a security
Checks for calls to `link_to`, `link_to_if`, and `link_to_unless` methods that contain a

def add_rel(send_node, offense_node, corrector) 

def add_rel(send_node, offense_node, corrector)
  opening_quote = offense_node.children.last.source[0]
  closing_quote = opening_quote == ':' ? '' : opening_quote
  new_rel_exp = ", rel: #{opening_quote}noopener#{closing_quote}"
  range = if (last_argument = send_node.last_argument).hash_type?
            last_argument.pairs.last.source_range
          else
            last_argument.source_range
          end
  corrector.insert_after(range, new_rel_exp)
end

def append_to_rel(rel_node, corrector) 

def append_to_rel(rel_node, corrector)
  existing_rel = rel_node.children.last.value
  str_range = rel_node.children.last.source_range.adjust(begin_pos: 1, end_pos: -1)
  corrector.replace(str_range, "#{existing_rel} noopener")
end

def autocorrect(corrector, send_node, node, option_nodes) 

def autocorrect(corrector, send_node, node, option_nodes)
  rel_node = nil
  option_nodes.map(&:children).each do |options|
    rel_node ||= options.find { |o| rel_node?(o) }
  end
  if rel_node
    append_to_rel(rel_node, corrector)
  else
    add_rel(send_node, node, corrector)
  end
end

def contains_noopener?(value) 

def contains_noopener?(value)
  return false unless value
  rel_array = value.to_s.split
  rel_array.include?('noopener') || rel_array.include?('noreferrer')
end

def on_send(node) 

def on_send(node)
  option_nodes = node.each_child_node(:hash)
  option_nodes.map(&:children).each do |options|
    blank = options.find { |o| blank_target?(o) }
    next unless blank && options.none? { |o| includes_noopener?(o) }
    add_offense(blank) do |corrector|
      autocorrect(corrector, node, blank, option_nodes)
    end
  end
end