class Rails::Html::PermitScrubber

with nodes: nokogiri.org/rdoc/Nokogiri/XML/Node.html<br>See the documentation for Nokogiri::XML::Node to understand what’s possible
end
end
name == “style”
def scrub_attribute?(name)
end
node.text?
def skip_node?(node)
end
self.tags = %w(form script comment blockquote)
super
def initialize
class CommentScrubber < Html::PermitScrubber
If not, attributes are removed based on Loofahs HTML5::Scrub.scrub_attributes.
If set, attributes excluded will be removed.
attributes=
If not, elements are stripped based on Loofahs HTML5::Scrub.allowed_element?.
If set, elements excluded will be stripped.
tags=
Supplied tags and attributes should be Enumerables.
Unallowed elements will be stripped, i.e. element is removed but its subtree kept.
Text and CDATA nodes are skipped by default.
Likewise for scrub_attribute? and attributes respectively.
Instead Loofahs behavior will be used.
If you override allowed_node? and no tags are set, it will not be called.
If tags or attributes are not set, Loofah’s behavior will be used.
Subclasses don’t need to worry if tags or attributes are set or not.
- When an attribute should be scrubbed via scrub_attribute?.
- When a node is allowed via allowed_node?.
- When a node should be skipped via skip_node?.
Rails::Html::PermitScrubber can be subclassed to determine:
Rails::Html::PermitScrubber allows you to permit only your own tags and/or attributes.
=== Rails::Html::PermitScrubber

def allowed_node?(node) 

def allowed_node?(node)
  @tags.include?(node.name)
end

def attributes=(attributes) 

def attributes=(attributes)
  @attributes = validate!(attributes, :attributes)
end

def initialize 

def initialize
  @direction = :bottom_up
  @tags, @attributes = nil, nil
end

def keep_node?(node) 

def keep_node?(node)
  if @tags
    allowed_node?(node)
  else
    Loofah::HTML5::Scrub.allowed_element?(node.name)
  end
end

def scrub(node) 

def scrub(node)
  if node.cdata?
    text = node.document.create_text_node node.text
    node.replace text
    return CONTINUE
  end
  return CONTINUE if skip_node?(node)
  unless (node.comment? || node.element?) && keep_node?(node)
    return STOP if scrub_node(node) == STOP
  end
  scrub_attributes(node)
end

def scrub_attribute(node, attr_node) 

def scrub_attribute(node, attr_node)
  attr_name = if attr_node.namespace
                "#{attr_node.namespace.prefix}:#{attr_node.node_name}"
              else
                attr_node.node_name
              end
  if Loofah::HTML5::SafeList::ATTR_VAL_IS_URI.include?(attr_name)
    # this block lifted nearly verbatim from HTML5 sanitization
    val_unescaped = CGI.unescapeHTML(attr_node.value).gsub(Loofah::HTML5::Scrub::CONTROL_CHARACTERS,'').downcase
    if val_unescaped =~ /^[a-z0-9][-+.a-z0-9]*:/ && ! Loofah::HTML5::SafeList::ALLOWED_PROTOCOLS.include?(val_unescaped.split(Loofah::HTML5::SafeList::PROTOCOL_SEPARATOR)[0])
      attr_node.remove
    end
  end
  if Loofah::HTML5::SafeList::SVG_ATTR_VAL_ALLOWS_REF.include?(attr_name)
    attr_node.value = attr_node.value.gsub(/url\s*\(\s*[^#\s][^)]+?\)/m, ' ') if attr_node.value
  end
  if Loofah::HTML5::SafeList::SVG_ALLOW_LOCAL_HREF.include?(node.name) && attr_name == 'xlink:href' && attr_node.value =~ /^\s*[^#\s].*/m
    attr_node.remove
  end
  node.remove_attribute(attr_node.name) if attr_name == 'src' && attr_node.value !~ /[^[:space:]]/
  Loofah::HTML5::Scrub.force_correct_attribute_escaping! node
end

def scrub_attribute?(name) 

def scrub_attribute?(name)
  !@attributes.include?(name)
end

def scrub_attributes(node) 

def scrub_attributes(node)
  if @attributes
    node.attribute_nodes.each do |attr|
      attr.remove if scrub_attribute?(attr.name)
      scrub_attribute(node, attr)
    end
    scrub_css_attribute(node)
  else
    Loofah::HTML5::Scrub.scrub_attributes(node)
  end
end

def scrub_css_attribute(node) 

def scrub_css_attribute(node)
  if Loofah::HTML5::Scrub.respond_to?(:scrub_css_attribute)
    Loofah::HTML5::Scrub.scrub_css_attribute(node)
  else
    style = node.attributes['style']
    style.value = Loofah::HTML5::Scrub.scrub_css(style.value) if style
  end
end

def scrub_node(node) 

def scrub_node(node)
  node.before(node.children) # strip
  node.remove
end

def skip_node?(node) 

def skip_node?(node)
  node.text?
end

def tags=(tags) 

def tags=(tags)
  @tags = validate!(tags, :tags)
end

def validate!(var, name) 

def validate!(var, name)
  if var && !var.is_a?(Enumerable)
    raise ArgumentError, "You should pass :#{name} as an Enumerable"
  end
  var
end