class RuboCop::Cop::Rails::LinkToBlank

This cop checks for calls to `link_to` that contain a `target: '_blank'` but no `rel: 'noopener'`. This can be a security risk as the loaded page will have control over the previous page and could change its location for phishing purposes.

The option `rel: 'noreferrer'` also blocks this behavior and removes the http-referrer header.

@example

# bad
link_to 'Click here', url, target: '_blank'

# good
link_to 'Click here', url, target: '_blank', rel: 'noopener'

# good
link_to 'Click here', url, target: '_blank', rel: 'noreferrer'

Constants

MSG

Public Instance Methods

autocorrect(node) click to toggle source
# File lib/rubocop/cop/rails/link_to_blank.rb, line 51
def autocorrect(node)
  lambda do |corrector|
    send_node = node.parent.parent

    option_nodes = send_node.each_child_node(:hash)
    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
end
on_send(node) click to toggle source
# File lib/rubocop/cop/rails/link_to_blank.rb, line 38
def on_send(node)
  return unless node.method?(:link_to)

  option_nodes = node.each_child_node(:hash)

  option_nodes.map(&:children).each do |options|
    blank = options.find { |o| blank_target?(o) }
    if blank && options.none? { |o| includes_noopener?(o) }
      add_offense(blank)
    end
  end
end

Private Instance Methods

add_rel(send_node, offence_node, corrector) click to toggle source
# File lib/rubocop/cop/rails/link_to_blank.rb, line 80
def add_rel(send_node, offence_node, corrector)
  opening_quote = offence_node.children.last.source[0]
  closing_quote = opening_quote == ':' ? '' : opening_quote
  new_rel_exp = ", rel: #{opening_quote}noopener#{closing_quote}"
  range = send_node.arguments.last.source_range

  corrector.insert_after(range, new_rel_exp)
end
append_to_rel(rel_node, corrector) click to toggle source
# File lib/rubocop/cop/rails/link_to_blank.rb, line 71
def append_to_rel(rel_node, corrector)
  existing_rel = rel_node.children.last.value
  str_range = rel_node.children.last.loc.expression.adjust(
    begin_pos: 1,
    end_pos: -1
  )
  corrector.replace(str_range, "#{existing_rel} noopener")
end
contains_noopener?(value) click to toggle source
# File lib/rubocop/cop/rails/link_to_blank.rb, line 89
def contains_noopener?(value)
  return false unless value

  rel_array = value.to_s.split(' ')
  rel_array.include?('noopener') || rel_array.include?('noreferrer')
end