initial whitelist lifted from html5.

Author: flavorjones

.gitignore

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+*~

lib/dryopteris.rb

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+
+require 'rubygems'
+gem 'nokogiri', '>=1.05'
+require 'nokogiri'
+
+require File.join(File.dirname(__FILE__), 'whitelist')
+
+module Dryopteris
+
+  def self.sanitize(string_or_io)
+    doc = Nokogiri(string_or_io)
+  end
+
+end

lib/whitelist.rb

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+#
+#  HTML whitelist lifted from HTML5 sanitizer code
+#    http://code.google.com/p/html5lib/
+#
+
+module Dryopteris
+  # <html5_license>
+  #
+  #   Copyright (c) 2006-2008 The Authors
+  #
+  #   Contributors:
+  #   James Graham - [email protected]
+  #   Anne van Kesteren - [email protected]
+  #   Lachlan Hunt - [email protected]
+  #   Matt McDonald - [email protected]
+  #   Sam Ruby - [email protected]
+  #   Ian Hickson (Google) - [email protected]
+  #   Thomas Broyer - [email protected]
+  #   Jacques Distler - [email protected]
+  #   Henri Sivonen - [email protected]
+  #   The Mozilla Foundation (contributions from Henri Sivonen since 2008)
+  #
+  #   Permission is hereby granted, free of charge, to any person
+  #   obtaining a copy of this software and associated documentation
+  #   files (the "Software"), to deal in the Software without
+  #   restriction, including without limitation the rights to use, copy,
+  #   modify, merge, publish, distribute, sublicense, and/or sell copies
+  #   of the Software, and to permit persons to whom the Software is
+  #   furnished to do so, subject to the following conditions:
+  #
+  #   The above copyright notice and this permission notice shall be
+  #   included in all copies or substantial portions of the Software.
+  #
+  #   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+  #   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+  #   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+  #   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+  #   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+  #   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+  #   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+  #   DEALINGS IN THE SOFTWARE.
+  #
+  # </html5_license>
+
+  ACCEPTABLE_ELEMENTS = %w[a abbr acronym address area b big blockquote br
+      button caption center cite code col colgroup dd del dfn dir div dl dt
+      em fieldset font form h1 h2 h3 h4 h5 h6 hr i img input ins kbd label
+      legend li map menu ol optgroup option p pre q s samp select small span
+      strike strong sub sup table tbody td textarea tfoot th thead tr tt u
+      ul var]
+
+  MATHML_ELEMENTS = %w[maction math merror mfrac mi mmultiscripts mn mo
+      mover mpadded mphantom mprescripts mroot mrow mspace msqrt mstyle msub
+      msubsup msup mtable mtd mtext mtr munder munderover none]
+
+  SVG_ELEMENTS = %w[a animate animateColor animateMotion animateTransform
+      circle defs desc ellipse font-face font-face-name font-face-src g
+      glyph hkern image linearGradient line marker metadata missing-glyph
+      mpath path polygon polyline radialGradient rect set stop svg switch
+      text title tspan use]
+
+  ACCEPTABLE_ATTRIBUTES = %w[abbr accept accept-charset accesskey action
+      align alt axis border cellpadding cellspacing char charoff charset
+      checked cite class clear cols colspan color compact coords datetime
+      dir disabled enctype for frame headers height href hreflang hspace id
+      ismap label lang longdesc maxlength media method multiple name nohref
+      noshade nowrap prompt readonly rel rev rows rowspan rules scope
+      selected shape size span src start style summary tabindex target title
+      type usemap valign value vspace width xml:lang]
+
+  MATHML_ATTRIBUTES = %w[actiontype align columnalign columnalign
+      columnalign columnlines columnspacing columnspan depth display
+      displaystyle equalcolumns equalrows fence fontstyle fontweight frame
+      height linethickness lspace mathbackground mathcolor mathvariant
+      mathvariant maxsize minsize other rowalign rowalign rowalign rowlines
+      rowspacing rowspan rspace scriptlevel selection separator stretchy
+      width width xlink:href xlink:show xlink:type xmlns xmlns:xlink]
+
+  SVG_ATTRIBUTES = %w[accent-height accumulate additive alphabetic
+       arabic-form ascent attributeName attributeType baseProfile bbox begin
+       by calcMode cap-height class color color-rendering content cx cy d dx
+       dy descent display dur end fill fill-rule font-family font-size
+       font-stretch font-style font-variant font-weight from fx fy g1 g2
+       glyph-name gradientUnits hanging height horiz-adv-x horiz-origin-x id
+       ideographic k keyPoints keySplines keyTimes lang marker-end
+       marker-mid marker-start markerHeight markerUnits markerWidth
+       mathematical max min name offset opacity orient origin
+       overline-position overline-thickness panose-1 path pathLength points
+       preserveAspectRatio r refX refY repeatCount repeatDur
+       requiredExtensions requiredFeatures restart rotate rx ry slope stemh
+       stemv stop-color stop-opacity strikethrough-position
+       strikethrough-thickness stroke stroke-dasharray stroke-dashoffset
+       stroke-linecap stroke-linejoin stroke-miterlimit stroke-opacity
+       stroke-width systemLanguage target text-anchor to transform type u1
+       u2 underline-position underline-thickness unicode unicode-range
+       units-per-em values version viewBox visibility width widths x
+       x-height x1 x2 xlink:actuate xlink:arcrole xlink:href xlink:role
+       xlink:show xlink:title xlink:type xml:base xml:lang xml:space xmlns
+       xmlns:xlink y y1 y2 zoomAndPan]
+
+  ATTR_VAL_IS_URI = %w[href src cite action longdesc xlink:href xml:base]
+
+  ACCEPTABLE_CSS_PROPERTIES = %w[azimuth background-color
+      border-bottom-color border-collapse border-color border-left-color
+      border-right-color border-top-color clear color cursor direction
+      display elevation float font font-family font-size font-style
+      font-variant font-weight height letter-spacing line-height overflow
+      pause pause-after pause-before pitch pitch-range richness speak
+      speak-header speak-numeral speak-punctuation speech-rate stress
+      text-align text-decoration text-indent unicode-bidi vertical-align
+      voice-family volume white-space width]
+
+  ACCEPTABLE_CSS_KEYWORDS = %w[auto aqua black block blue bold both bottom
+      brown center collapse dashed dotted fuchsia gray green !important
+      italic left lime maroon medium none navy normal nowrap olive pointer
+      purple red right solid silver teal top transparent underline white
+      yellow]
+
+  ACCEPTABLE_SVG_PROPERTIES = %w[fill fill-opacity fill-rule stroke
+      stroke-width stroke-linecap stroke-linejoin stroke-opacity]
+
+  ACCEPTABLE_PROTOCOLS = %w[ed2k ftp http https irc mailto news gopher nntp
+      telnet webcal xmpp callto feed urn aim rsync tag ssh sftp rtsp afs]
+
+  # subclasses may define their own versions of these constants
+  ALLOWED_ELEMENTS = ACCEPTABLE_ELEMENTS + MATHML_ELEMENTS + SVG_ELEMENTS
+  ALLOWED_ATTRIBUTES = ACCEPTABLE_ATTRIBUTES + MATHML_ATTRIBUTES + SVG_ATTRIBUTES
+  ALLOWED_CSS_PROPERTIES = ACCEPTABLE_CSS_PROPERTIES
+  ALLOWED_CSS_KEYWORDS = ACCEPTABLE_CSS_KEYWORDS
+  ALLOWED_SVG_PROPERTIES = ACCEPTABLE_SVG_PROPERTIES
+  ALLOWED_PROTOCOLS = ACCEPTABLE_PROTOCOLS
+
+end