This sanitize helper
will html encode all tags and strip all attributes that aren‘t
specifically allowed. It also strips href/src tags with invalid protocols,
like javascript: especially. It does its best to counter any tricks that
hackers may use, like throwing in unicode/ascii/hex values to get past the
javascript: filters. Check out the extensive test suite.
<%= sanitize @article.body %>
You can add or remove tags/attributes if you want to customize it a bit.
See ActionView::Base for full docs on the
available options. You can add tags/attributes for single uses of sanitize by passing either the
:attributes or :tags options:
Normal Use
<%= sanitize @article.body %>
Custom Use (only the mentioned tags and attributes are allowed, nothing
else)
<%= sanitize @article.body, :tags => %w(table tr td), :attributes => %w(id class style)
Add table tags to the default allowed tags
Rails::Initializer.run do |config|
config.action_view.sanitized_allowed_tags = 'table', 'tr', 'td'
end
Remove tags to the default allowed tags
Rails::Initializer.run do |config|
config.after_initialize do
ActionView::Base.sanitized_allowed_tags.delete 'div'
end
end
Change allowed default attributes
Rails::Initializer.run do |config|
config.action_view.sanitized_allowed_attributes = 'id', 'class', 'style'
end
Please note that sanitizing user-provided text does not guarantee that the
resulting markup is valid (conforming to a document type) or even
well-formed. The output may still contain e.g. unescaped
’<’, ’>’, ’&’ characters and
confuse browsers.