Module: ActionView::Helpers::SanitizeHelper

Sanitizes HTML input, stripping all but known-safe tags and attributes.

It also strips href/src attributes with unsafe protocols like javascript:, while also protecting against attempts to use Unicode, ASCII, and hex character references to work around these protocol filters. All special characters will be escaped.

The default sanitizer is Rails::Html::SafeListSanitizer. See Rails HTML Sanitizers for more information.

Custom sanitization rules can also be provided.

Please note that sanitizing user-provided text does not guarantee that the resulting markup is valid or even well-formed.

Options

• :tags - An array of allowed tags.

• :attributes - An array of allowed attributes.

• :scrubber - A {Rails::Html scrubber} or Loofah::Scrubber object that defines custom sanitization rules. A custom scrubber takes precedence over custom tags and attributes.

Examples

Normal use:

<%= sanitize @comment.body %>

Providing custom lists of permitted tags and attributes:

<%= sanitize @comment.body, tags: %w(strong em a), attributes: %w(href) %>

Providing a custom Rails::Html scrubber:

class CommentScrubber < Rails::Html::PermitScrubber
  def initialize
    super
    self.tags = %w( form script comment blockquote )
    self.attributes = %w( style )
  end

  def skip_node?(node)
    node.text?
  end
end

<%= sanitize @comment.body, scrubber: CommentScrubber.new %>

See {Rails HTML Sanitizer} for documentation about Rails::Html scrubbers.

Providing a custom Loofah::Scrubber:

scrubber = Loofah::Scrubber.new do |node|
  node.remove if node.name == 'script'
end

<%= sanitize @comment.body, scrubber: scrubber %>

See Loofah’s documentation for more information about defining custom Loofah::Scrubber objects.

To set the default allowed tags or attributes across your application:

# In config/application.rb
config.action_view.sanitized_allowed_tags = ['strong', 'em', 'a']
config.action_view.sanitized_allowed_attributes = ['href', 'title']