123456789_123456789_123456789_123456789_123456789_

Module: ActionView::Helpers::SanitizeHelper

Relationships & Source Files
Extension / Inclusion / Inheritance Descendants
Included In:
ActionDispatch::DebugView, ::ActionView::Base, ::ActionView::Helpers, FormHelper, FormOptionsHelper, FormTagHelper, ActionView::Helpers::Tags::Base, ActionView::Helpers::Tags::CheckBox, ActionView::Helpers::Tags::CollectionCheckBoxes, ActionView::Helpers::Tags::CollectionRadioButtons, ActionView::Helpers::Tags::CollectionSelect, ActionView::Helpers::Tags::ColorField, ActionView::Helpers::Tags::DateField, ActionView::Helpers::Tags::DateSelect, ActionView::Helpers::Tags::DatetimeField, ActionView::Helpers::Tags::DatetimeLocalField, ActionView::Helpers::Tags::DatetimeSelect, ActionView::Helpers::Tags::EmailField, ActionView::Helpers::Tags::FileField, ActionView::Helpers::Tags::GroupedCollectionSelect, ActionView::Helpers::Tags::HiddenField, ActionView::Helpers::Tags::Label, ActionView::Helpers::Tags::MonthField, ActionView::Helpers::Tags::NumberField, ActionView::Helpers::Tags::PasswordField, ActionView::Helpers::Tags::RadioButton, ActionView::Helpers::Tags::RangeField, ActionView::Helpers::Tags::SearchField, ActionView::Helpers::Tags::Select, ActionView::Helpers::Tags::TelField, ActionView::Helpers::Tags::TextArea, ActionView::Helpers::Tags::TextField, ActionView::Helpers::Tags::TimeField, ActionView::Helpers::Tags::TimeSelect, ActionView::Helpers::Tags::TimeZoneSelect, ActionView::Helpers::Tags::UrlField, ActionView::Helpers::Tags::WeekField, ActionView::Helpers::Tags::WeekdaySelect, TextHelper, ::ActionView::TestCase, ::ActionView::TestCase::Behavior
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
Defined in: actionview/lib/action_view/helpers/sanitize_helper.rb

Overview

Action View Sanitize Helpers

The SanitizeHelper module provides a set of methods for scrubbing text of undesired HTML elements. These helper methods extend Action View making them callable within your template files.

Class Attribute Summary

Class Method Summary

::ActiveSupport::Concern - Extended

class_methods

Define class methods from given block.

included

Evaluate given block in context of base class, so that you can write class macros here.

prepended

Evaluate given block in context of base class, so that you can write class macros here.

Instance Attribute Summary

Instance Method Summary

Class Attribute Details

.sanitizer_vendor (rw) Also known as: #sanitizer_vendor

[ GitHub ]

  
# File 'actionview/lib/action_view/helpers/sanitize_helper.rb', line 12

mattr_accessor :sanitizer_vendor, default: Rails::HTML4::Sanitizer

Instance Attribute Details

#sanitizer_vendor (rw)

[ GitHub ]

  
# File 'actionview/lib/action_view/helpers/sanitize_helper.rb', line 12

mattr_accessor :sanitizer_vendor, default: Rails::HTML4::Sanitizer

Instance Method Details

#sanitize(html, options = {})

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.

The default sanitizer is Rails::HTML5::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.

Global Configuration

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']

The default, starting in Rails 7.1, is to use an HTML5 parser for sanitization (if it is available, see NOTE below). If you wish to revert back to the previous HTML4 behavior, you can do so by setting the following in your application configuration:

# In config/application.rb
config.action_view.sanitizer_vendor = Rails::HTML4::Sanitizer

Or, if you’re upgrading from a previous version of Rails and wish to opt into the HTML5 behavior:

# In config/application.rb
config.action_view.sanitizer_vendor = Rails::HTML5::Sanitizer

NOTE: Rails::HTML5::Sanitizer is not supported on JRuby, so on JRuby platforms Rails will fall back to using Rails::HTML4::Sanitizer.

[ GitHub ]

  
# File 'actionview/lib/action_view/helpers/sanitize_helper.rb', line 111

def sanitize(html, options = {})
  self.class.safe_list_sanitizer.sanitize(html, options)&.html_safe
end

#sanitize_css(style)

Sanitizes a block of CSS code. Used by #sanitize when it comes across a style attribute.

[ GitHub ]

  
# File 'actionview/lib/action_view/helpers/sanitize_helper.rb', line 116

def sanitize_css(style)
  self.class.safe_list_sanitizer.sanitize_css(style)
end

#strip_tags(html)

Strips all HTML tags from html, including comments and special characters.

strip_tags("Strip <i>these</i> tags!")
# => Strip these tags!

strip_tags("<b>Bold</b> no more!  <a href='more.html'>See more here</a>...")
# => Bold no more!  See more here...

strip_tags("<div id='top-bar'>Welcome to my website!</div>")
# => Welcome to my website!

strip_tags("> A quote from Smith & Wesson")
# => &gt; A quote from Smith &amp; Wesson
[ GitHub ]

  
# File 'actionview/lib/action_view/helpers/sanitize_helper.rb', line 133

def strip_tags(html)
  self.class.full_sanitizer.sanitize(html)&.html_safe
end