loofah version 0.4.7 has been released!

* <http://github.com/flavorjones/loofah>
* <http://loofah.rubyforge.org>
* <http://rubyforge.org/projects/loofah>

Loofah is a general library for manipulating and transforming HTML/XML
documents and fragments. It's built on top of Nokogiri and libxml2, so
it's fast and has a nice API.

Loofah excels at HTML sanitization (XSS prevention). It includes some
nice HTML sanitizers, which are based on HTML5lib's whitelist, so it
most likely won't make your codes less secure. (These statements have
not been evaluated by Netexperts.)

== Changes

0.4.7 (2010-03-09)

Enhancements:

* New methods Loofah::HTML::Document#to_text and
  Loofah::HTML::DocumentFragment#to_text do the right thing with
  whitespace. Note that these methods are significantly slower than
  #text. GH #12
* Loofah::Elements::BLOCK_LEVEL contains a canonical list of HTML4
block-level4 elements.
* Loofah::HTML::Document#text and Loofah::HTML::DocumentFragment#text
  will return unescaped HTML entities by passing :encode_special_chars =>
false.

== Features

* Easily write custom scrubbers for HTML/XML leveraging the sweetness of
Nokogiri (and HTML5lib's whitelists).
* Common HTML sanitizing tasks are built-in:
  * _Strip_ unsafe tags, leaving behind only the inner text.
  * _Prune_ unsafe tags and their subtrees, removing all traces that they
ever existed.
  * _Escape_ unsafe tags and their subtrees, leaving behind lots of
<tt>&lt;</tt> and <tt>&gt;</tt> entities.
  * _Whitewash_ the markup, removing all attributes and namespaced nodes.
* Common HTML transformation tasks are built-in:
  * Add the _nofollow_ attribute to all hyperlinks.
* Format markup as plain text, with or without sensible whitespace handling
around block elements.
* Replace Rails's +strip_tags+ and +sanitize+ helper methods.
* Two ActiveRecord extensions:
  * Loofah::XssFoliate, an XssTerminate[
http://github.com/look/xss_terminate/tree/master] drop-in replacement, is an
*opt-out* sanitizer. By default all models and attributes are sanitized.
  * Loofah::ActiveRecordExtension is an *opt-in* sanitizer. You must
explicitly declare attributes to be sanitized.

== Compare and Contrast

Loofah is one of two known Ruby XSS/sanitization solutions that
guarantees well-formed and valid markup (the other is Sanitize, which
also uses Nokogiri).

Loofah works fine on XML, XHTML and HTML documents.

Also, it's pretty fast. Here is a benchmark comparing Loofah to other
commonly-used libraries (ActionView, Sanitize, HTML5lib and HTMLfilter):

* http://gist.github.com/170193

Lastly, Loofah is extensible. It's super-easy to write your own custom
scrubbers for whatever document manipulation you need. You don't like
the built-in scrubbers? Build your own, like a boss.