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   9 <head>
  10 <title>HTML Purifier - Filter your HTML the standards-compliant way!</title>
  11 <xi:include href="common-meta.xml" xpointer="xpointer(/*/node())" />
  12 <link rel="stylesheet" href="index.css" type="text/css" />
  13 <meta name="description"
  14       content="HTML filter that guards against XSS and ensures standards-compliant output." />
  15 <meta name="keywords"
  16       content="HTMLPurifier, HTML Purifier, HTML, filter, filtering, standards, compliant, w3c, XSS, PHP, security, library, open source, LGPL, whitelist" />
  17 <link rel="alternate" type="application/rss+xml"
  18       title="News - HTML Purifier" href="news.rss"
  19       rss:for="news-container"
  20       rss:description="Recent news and updates on HTML Purifier" />
  21 </head>
  22 <body>
  23
  24 <img src="logo.png" id="logo" alt="HTML Purifier" />
  25 <h1 id="header"><span class="html">HTML</span>
  26 <span class="purifier">Purifier</span></h1>
  27
  28 <div id="navigation">
  29     <h2>Navigation</h2>
  30     <ol>
  31         <li><a href="#News">News</a></li>
  32         <li><a href="#Plugins">Plugins</a></li>
  33         <li><a href="#Demo">Demo</a></li>
  34         <li><strong><a href="#Download">Download</a></strong></li>
  35         <li><a href="#Resources">Resources</a></li>
  36         <li><a href="phorum/">Forum</a></li>
  37         <li><a href="#Contact">Contact</a></li>
  38     </ol>
  39 </div>
  40
  41 <div id="content">
  42
  43 <a href="#Download"><img src="download.png" class="download-button" alt="Download HTML Purifier" /></a>
  44
  45 <p><strong>HTML Purifier</strong> is a standards-compliant
  46 <abbr>HTML</abbr> filter library written in
  47 <abbr>PHP</abbr>. HTML Purifier will not only remove all malicious
  48 code (better known as <abbr>XSS</abbr>) with a thoroughly audited,
  49 secure <em>yet</em> permissive <strong><a
  50 href="http://hp.jpsband.org/live/smoketests/printDefinition.php">whitelist</a></strong>,
  51 it will also make sure your documents are
  52 <strong>standards compliant</strong>, something only achievable with a
  53 comprehensive knowledge of <abbr>W3C</abbr>'s specifications.
  54 Tired of using BBCode due to the current landscape of deficient or
  55 insecure <abbr>HTML</abbr> filters? Have a
  56 <strong><acronym>WYSIWYG</acronym></strong> editor but never been able to use it? Looking
  57 for high-quality, standards-compliant, open-source components for that
  58 application you're building? HTML Purifier is for you!</p>
  59
  60 <blockquote class="fancy">
  61 <div class="quote">
  62     I'd just like to say we use HTML Purifier in <a href="http://www.iris.ac/">IRIS</a> for
  63     filtering emails against XSS attacks and we've been more than impressed.
  64 </div>
  65 <div class="origin">&mdash; Chris Corbyn, <em>Senior IRIS Developer</em></div>
  66 </blockquote>
  67
  68 <h2 id="Background">Background</h2>
  69
  70 <p>There are a number of open-source <abbr>HTML</abbr> filtering solutions out
  71 there on the web already
  72 (i.e. <acronym>PEAR</acronym>'s
  73 <a href="http://pear.php.net/package/HTML_Safe">HTML_Safe</a>,
  74 <a href="http://sourceforge.net/projects/kses">kses</a>
  75 and
  76 <a href="http://simon.incutio.com/archive/2003/02/23/safeHtmlChecker">
  77 SafeHtmlChecker.class.php</a>).  What sets HTML Purifier apart from them?
  78 Aren't all of these choices <q>secure</q>?</p>
  79
  80 <p>When it comes to <abbr>HTML</abbr>, <strong>attention to
  81 detail</strong> is key. Does the library demonstrate an in-depth
  82 knowledge of the <abbr>DTD</abbr> that defines
  83 <abbr>HTML</abbr>? Does it perform its filtering off a robust
  84 whitelist rather than a usually out-dated blacklist? Does it go through
  85 the care to check every single attribute in the document for validity?
  86 Does it actually understand tag markup, or pay lip-service with a series
  87 of deficient regexes and str_replace's?</p>
  88
  89 <p>Somewhere along the way, all of HTML Purifier's predecessors fall
  90 flat. HTML_Safe dooms itself to attacks of the future by using a
  91 blacklist. Configurable filters like kses and PHP Input Filter still
  92 cannot validate the contents inside attributes. With all these gaps in
  93 coverage, none of the usual libraries come close to achieving
  94 <strong>standards-compliance</strong>. There is a user-unfriendly,
  95 draconic <abbr>XML</abbr>-based filter called Safe HTML Checker,
  96 but even it forgets that <code>&lt;a&gt;</code> tags cannot be nested
  97 within each other!</p>
  98
  99 <p><strong>Know thy enemy.</strong> Wily hackers have a huge arsenal of
 100 <abbr>XSS</abbr> hidden within the depths of the
 101 <abbr>HTML</abbr> specification. HTML Purifier takes its
 102 effectiveness from the fact that it will decompose the whole document
 103 into tokens, and rigorously process the tokens by removing
 104 non-whitelisted elements, transforming bad practice tags like font into
 105 span, properly checking the nesting of tags and their children and
 106 validating all attributes according to their <abbr>RFC</abbr>s.
 107 HTML Purifier's comprehensive algorithms are complemented by a
 108 <strong>breadth of knowledge</strong>, ensuring that richly formatted
 109 documents pass through unstripped.</p>
 110
 111 <p><a href="comparison.html"><img src="compare.png" class="compare-button" alt="Compare HTML Purifier with other filters" /></a></p>
 112
 113 <p>To my knowledge, there is nothing else in the wild that offers
 114 protection from <abbr>XSS</abbr>, standards-compliance, and the
 115 corrective processing of poorly formed <abbr>HTML</abbr>
 116 simultaneously. Don't take my word for it though:
 117 do your research. Investigate the other libraries, and decide for
 118 yourself who you would prefer to be the <strong>gatekeeper</strong> to
 119 your system.</p>
 120
 121 <p>To find out more, you can read the
 122 <a href="comparison.html"><strong>Comparison</strong></a>
 123 for a play-by-play analysis of the major filter libraries currently
 124 out there.</p>
 125
 126 <blockquote class="fancy">
 127 <div class="quote">
 128     [Y]ou save my day by allowing me not to write another damned HTML parser.
 129 </div>
 130 <div class="origin">
 131     &mdash; Joseph Halter, <em>Technical Director at Akira Web</em>
 132 </div>
 133 </blockquote>
 134
 135
 136 <h2 id="News">News</h2>
 137
 138 <div id="news-container" class="news">
 139
 140 <div class="item" id="news-pear-channel">
 141     <h3 class="title"><acronym>PEAR</acronym> channel available</h3>
 142     <div class="date">Sat, 24 March 2007 20:27:42 EDT</div>
 143
 144     <div class="body">
 145     <p>At the prompting of Lars Olesen, HTML Purifier now
 146     has its very own <acronym>PEAR</acronym> channel. This means that
 147     installing HTML Purifier is as simple as:</p>
 148     <pre class="command">pear channel-discover hp.jpsband.org
 149 pear install hp/HTMLPurifier</pre>
 150     </div>
 151 </div>
 152
 153 <div class="item" id="news-1.5.0-released">
 154     <h3 class="title">HTML Purifier 1.5.0 released</h3>
 155     <div class="date">Fri, 23 March 2007 22:42:12 EDT</div>
 156
 157     <div class="body">
 158     <p>The 1.5.0 major bugfix
 159     release is available today. There have been some major internal
 160     refactoring efforts, but these changes are invisible to you.</p>
 161
 162     <p>Entrepid souls wanting to test out the new
 163     <code>HTMLModuleManager</code> class can check out the
 164     <code>HTMLModule</code>s. Also, I will personally assist anyone
 165     who has modified <code>HTMLDefinition.php</code>. <strong>If you
 166     have patched any files, please consult the Support forums before
 167     upgrading.</strong></p>
 168
 169     <p>And now, the goodies:</p>
 170
 171     <ul>
 172         <li><strong><abbr>XHTML</abbr> 1.1-style modularization of
 173         <code>HTMLDefinition</code>.</strong> Instead of one monster,
 174         huge <code>HTMLDefinition</code> class, the file has been
 175         partitioned into modular bits organized into categories
 176         like <q>Hypertext</q>, <q>Lists</q> and <q>Tables</q>. The
 177         design of these modules makes it possible to arbitrarily
 178         add your own elements without ever having to patch a core
 179         file. However, the interface is unintuitive, not
 180         documented, and definitely going to change. Keep your eyes
 181         on this one.</li>
 182         <li>Rudimentary internationalization system implemented. It's
 183         not used yet, but will become the foundation of a projected
 184         error reporting feature HTML Purifier will be getting soon.</li>
 185         <li><code>x</code> subtag now allowed in language codes.</li>
 186         <li>Buggy chameleon support for <code>ins</code> and <code>del</code>
 187         fixed.</li>
 188         <li>Element by element AllowedAttribute declaration now possible
 189         for global attributes. Instead of <code>*.class</code>, you can write
 190         <code>span.class</code> (the old syntax still works, and enables
 191         the attribute for all elements).</li>
 192         <li>Fatal error when <abbr>PHP</abbr>4 <acronym>DOM</acronym>
 193         <abbr>XML</abbr> extension was loaded now fixed.</li>
 194         <li>Youtube filter regexp now multiline.</li>
 195     </ul>
 196     <p>...as well as an assortment of some code refactoring (all
 197     bugfixes are covered above). See <a
 198     href="http://hp.jpsband.org/svnroot/htmlpurifier/tags/1.5.0/NEWS">News</a>
 199     for a complete changelog.</p>
 200     </div>
 201 </div>
 202
 203
 204 <div class="item" id="news-rss-feed">
 205     <h3 class="title"><abbr>RSS</abbr> feed!</h3>
 206     <div class="date">Sat, 17 March 2007 5:42:12 EDT</div>
 207
 208     <div class="body">
 209     <p>We have a shiny new <abbr>RSS</abbr> feed
 210     at <a href="news.rss">news.rss</a>, which is hooked up to this
 211     news feed. Subscribe for release notifications as well as random
 212     news about HTML Purifier.</p>
 213     </div>
 214 </div>
 215
 216 <div class="item" id="news-status-on-api">
 217     <h3 class="title">Status on 1.5 and the Advanced <abbr>API</abbr></h3>
 218     <div class="date">Wed, 14 March 2007 5:31:46 EDT</div>
 219
 220     <div class="body">
 221     <p>Quick update on the status of version 1.5. The flagship
 222     new feature of this release is to be an advanced system for selecting
 223     and creating elements and attributes. You can view the <a
 224     href="http://hp.jpsband.org/live/docs/dev-advanced-api.html">projected
 225     advanced <abbr>API</abbr> here</a>.</p>
 226
 227     <p>If you actually took the time out to scan the document, you may notice
 228     that its incomplete. This is a very big problem. I am slowly grinding
 229     away at the details, but any suggestions and comments would be
 230     greatly appreciated. You can post anything you want to see in the
 231     <a href="http://hp.jpsband.org/phorum/list.php?2">general forums</a>.</p>
 232     </div>
 233 </div>
 234
 235 <div class="item" id="news-utf8-tutorial">
 236     <h3 class="title"><abbr>UTF-8</abbr> Tutorial</h3>
 237     <div class="date">Sat, 27 Jan 2007 13:30:56 EST</div>
 238
 239     <div class="body">
 240     <p>Here's a tutorial on <a
 241     href="http://hp.jpsband.org/live/docs/enduser-utf8.html">HTML Purifier
 242     and <abbr>UTF-8</abbr> character encoding issues</a>. It discusses
 243     how to figure out your character encoding, why you should
 244     <abbr>UTF-8</abbr>, and how to migrate (should you choose to do
 245     so). </p>
 246     </div>
 247 </div>
 248
 249 </div> <!-- end news-container -->
 250
 251 <h2 id="Plugins">Plugins</h2>
 252
 253 <p>HTML Purifier is a great library to integrate with existing
 254 <abbr>CMS</abbr>es and other applications or <acronym>WYSIWYG</acronym> editors.  Currently, we have plugins
 255 for:</p>
 256
 257 <ul>
 258     <li><a href="http://bart.motd.be/projects/html-purifier-drupal-module">Drupal HTML Purifier Module</a> (beta) by Bart Jansens</li>
 259     <li><a href="http://hp.jpsband.org/svnroot/htmlpurifier/trunk/plugins/modx.txt">MODx Content Management System</a></li>
 260 </ul>
 261
 262 <blockquote class="fancy">
 263 <div class="quote">
 264     This plugin is on top of my favorite list[.] I am going to heavily
 265     depend on it since my clients insist on having <acronym>WYSIWYG</acronym> and I insist on
 266     having pages that validate and are semantically sound.
 267 </div>
 268 <div class="origin">
 269     &mdash; David Molliere, <em>MODx Marketing &amp; Design Team</em>
 270 </div>
 271 </blockquote>
 272
 273 <p>Plugins for other major applications gladly accepted!</p>
 274
 275
 276 <h2 id="Demo">Demo</h2>
 277
 278 <p>Enter your <abbr>HTML</abbr> and see how it will be filtered!</p>
 279 <form id="filter" action="http://hp.jpsband.org/live/docs/examples/demo.php?post" method="post">
 280     <fieldset>
 281     <legend>HTML Purifier Input</legend>
 282     <textarea name="html" cols="50" rows="10" id="html"></textarea>
 283     <div><abbr>XHTML</abbr> 1.0 Strict output? <input type="checkbox" value="1" name="strict" /></div>
 284     <div>
 285         <input type="submit" value="Submit" name="submit" class="button" />
 286     </div>
 287     </fieldset>
 288 </form>
 289
 290 <p>...or try these sample inputs:</p>
 291
 292 <ul>
 293     <li><a href="http://hp.jpsband.org/live/docs/examples/demo.php?get&amp;html=%3Cimg+src%3D%22javascript%3Aevil%28%29%3B%22+onload%3D%22evil%28%29%3B%22+%2F%3E">Malicious code removed</a></li>
 294     <li><a href="http://hp.jpsband.org/live/docs/examples/demo.php?html=%3Cb%3EBold&amp;submit=Submit">Missing end tags fixed</a></li>
 295     <li><a href="http://hp.jpsband.org/live/docs/examples/demo.php?html=%3Cb%3EInline+%3Cdel%3Econtext+%3Cdiv%3ENo+block+allowed%3C%2Fdiv%3E%3C%2Fdel%3E%3C%2Fb%3E&amp;submit=Submit">Illegal nesting fixed</a></li>
 296     <li><a href="http://hp.jpsband.org/live/docs/examples/demo.php?html=%3Ccenter%3ECentered%3C%2Fcenter%3E&amp;strict=1&amp;submit=Submit">Deprecated tags converted</a></li>
 297     <li><a href="http://hp.jpsband.org/live/docs/examples/demo.php?html=%3Cspan+style%3D%22color%3A%23COW%3Bfloat%3Aaround%3Btext-decoration%3Ablink%3B%22%3EText%3C%2Fspan%3E&amp;submit=Submit"><abbr>CSS</abbr> validated</a></li>
 298     <li><a href="http://hp.jpsband.org/live/docs/examples/demo.php?html=%3Ctable%3E%0D%0A++%3Ccaption%3E%0D%0A++++Cool+table%0D%0A++%3C%2Fcaption%3E%0D%0A++%3Ctfoot%3E%0D%0A++++%3Ctr%3E%0D%0A++++++%3Cth%3EI+can+do+so+much%21%3C%2Fth%3E%0D%0A++++%3C%2Ftr%3E%0D%0A++%3C%2Ftfoot%3E%0D%0A++%3Ctr%3E%0D%0A++++%3Ctd+style%3D%22font-size%3A16pt%3B%0D%0A++++++color%3A%23F00%3Bfont-family%3Asans-serif%3B%0D%0A++++++text-align%3Acenter%3B%22%3EWow%3C%2Ftd%3E%0D%0A++%3C%2Ftr%3E%0D%0A%3C%2Ftable%3E&amp;submit=Submit">Rich formatting preserved</a></li>
 299 </ul>
 300
 301 <h2 id="Download">Download</h2>
 302
 303 <p>The current version is
 304 <strong>1.5.0</strong>.  Pick your distribution:</p>
 305
 306 <ul>
 307 <li><a class="download" href="releases/htmlpurifier-1.5.0.tar.gz">HTML Purifier 1.5.0 (.tar.gz)</a> [<a href="releases/htmlpurifier-1.5.0.tar.gz.sig">sig</a>]</li>
 308 <li><a class="download" href="releases/htmlpurifier-1.5.0.zip">HTML Purifier 1.5.0 (.zip)</a> [<a href="releases/htmlpurifier-1.5.0.zip.sig">sig</a>]</li>
 309 <li><a class="download" href="releases/htmlpurifier-1.5.0-strict.tar.gz">HTML Purifier 1.5.0 PHP5-strict (.tar.gz)</a> [<a href="releases/htmlpurifier-1.5.0-strict.tar.gz.sig">sig</a>]</li>
 310 <li><a class="download" href="releases/htmlpurifier-1.5.0-strict.zip">HTML Purifier 1.5.0 PHP5-strict (.zip)</a> [<a href="releases/htmlpurifier-1.5.0-strict.zip.sig">sig</a>]</li>
 311 </ul>
 312
 313 <p>The <abbr>PHP</abbr>5-strict version is exactly the same
 314 as the regular version with a few tweaks
 315 to prevent it from complaining with
 316 <a href="http://php.net/manual/en/ref.errorfunc.php#e-strict">E_STRICT</a>
 317 warnings.This library is open-source, licensed under the
 318 <a href="http://www.gnu.org/licenses/lgpl.html"><abbr>LGPL</abbr> v2.1+</a>.</p>
 319
 320 <p>HTML Purifier is also available as a <acronym>PEAR</acronym> package.
 321 You can install it by executing:</p>
 322
 323 <pre class="command">pear channel-discover hp.jpsband.org
 324 pear install hp/HTMLPurifier</pre>
 325
 326 <p>You can also grab the latest developmental code from our Subversion
 327 repository.  Simply execute this command:</p>
 328
 329 <pre class="command">svn co http://hp.jpsband.org/svnroot/htmlpurifier/trunk ./</pre>
 330
 331 <p>...or <a href="http://hp.jpsband.org/svnroot/htmlpurifier/trunk/">browse
 332 anonymously</a> at that address. Previous releases can be obtained by browsing
 333 the <a href="releases/">release directory</a>
 334 or checking code out of the
 335 <a href="http://hp.jpsband.org/svnroot/htmlpurifier/tags/">tags/
 336 directory</a>.</p>
 337
 338 <p><acronym>SHA-1</acronym> checksums:</p>
 339
 340 <pre>
 341 ec0c9cd1f24840a93cc3785e109dad925d8acd8c htmlpurifier-1.5.0-strict.tar.gz
 342 c3f48848a33345cfdb01ec61db7dc5e28e4fbef8 htmlpurifier-1.5.0-strict.zip
 343 d48dc62acfb26605428e49b4275e8f689cf04439 htmlpurifier-1.5.0.tar.gz
 344 e687a1ff0008d0303e9ec964704accdc59ed96ef htmlpurifier-1.5.0.zip
 345 </pre>
 346
 347 <p>There are also <tt>.sig</tt> files which you can use to cryptographically verify
 348 that the release is from me, Edward Z. Yang.  You can find
 349 my <a href="http://www.thewritingpot.com/gpgpubkey.asc">public key
 350 here (0x869C48DA)</a>.  My key's fingerprint is:
 351 <tt>3FA8 E9A9 7385 B691 A6FC  B3CB A933 BE7D 869C 48DA</tt>.</p>
 352
 353 <p>Verify with these commands:</p>
 354
 355 <pre class="command">gpg --verify <strong>$filename</strong>.sig</pre>
 356
 357 <p>You can be notified of new releases by a low-traffic announce list. Subscribe
 358 here:</p>
 359
 360 <form method="post" action="http://scripts.dreamhost.com/add_list.cgi">
 361    <input type="hidden" name="list" value="htmlpurifier@jpsband.org" />
 362    <input type="hidden" name="domain" value="jpsband.org" />
 363    <input type="hidden" name="emailit" value="1" />
 364    <div>Name: <input name="name" /> E-mail: <input name="email" /></div>
 365    <div><input type="submit" name="submit" value="Suscribe to Announcement List" />
 366    <input type="submit" name="unsub" value="Unsubscribe" /></div>
 367 </form>
 368
 369 <h2 id="Resources">Resources</h2>
 370 <ul>
 371     <li><strong><a href="http://hp.jpsband.org/live/docs/">End-User
 372         Documentation</a></strong> &mdash; In-depth documents on how to get
 373         the most out of HTML Purifier.</li>
 374     <li><a href="mantis/">Mantis Bugtracker</a> &mdash; Found a bug? Report
 375         it here!</li>
 376     <li><a href="phorum/">Support Forum</a> &mdash; Talk about all things
 377         HTML Purifier.</li>
 378     <li><a href="http://hp.jpsband.org/live/smoketests/printDefinition.php">Print
 379         Definition</a> &mdash; If you want to actually see what HTML Purifier's
 380         filtering rules are, look no further than to this page. You can even
 381         experiment with the configuration to see how things respond to different
 382         directives.</li>
 383     <li><a href="http://hp.jpsband.org/live/smoketests/xssAttacks.php"><abbr>XSS</abbr>
 384         Attacks Smoketest</a> &mdash; Tests how well HTML Purifier fares
 385         against RSnake's famous cheatsheet of <abbr>XSS</abbr> attacks.</li>
 386     <li><a href="http://hp.jpsband.org/live/TODO">Roadmap</a>
 387         &mdash; Subject to lots of delays, but it's a glimpse of the future</li>
 388     <li><a href="http://hp.jpsband.org/live/art/">Artwork</a>
 389         &mdash; Extra media goodies.</li>
 390     <li><a href="http://hp.jpsband.org/live/configdoc/plain.html">Configuration
 391         documentation</a> &mdash; See the <code>INSTALL</code> document on how to
 392         configure your HTML Purifier installation.</li>
 393     <li><a href="http://hp.jpsband.org/doxygen/html/">Doxygen-generated
 394         Documentation</a> &mdash; No class left undocumented!  Cross-referenced
 395         code!  A must-read for any prospective HTML Purifier hacker.
 396         (close by, <a href="http://hp.jpsband.org/phpdoc/">PHPDoc-generated
 397         Documentation.</a>)</li>
 398 </ul>
 399
 400 <h2 id="Propaganda">Spread the Word!</h2>
 401
 402 <p>Help spread awareness about HTML Purifier by:</p>
 403
 404 <ul>
 405 <li><a
 406 href="http://del.icio.us/post?v=4&amp;noui&amp;url=http://hp.jpsband.org/&amp;title=HTML%20Purifier%20-%20Filter%20your%20HTML%20the%20standards-compliant%20way!"
 407 id="delicious">Bookmarking this website</a> on your <strong>del.icio.us</strong> account, and/or</li>
 408 <li>
 409     <div>Including this little <strong>label</strong> on your website:
 410     <a href="http://hp.jpsband.org/"><img
 411     src="http://hp.jpsband.org/live/art/powered.png"
 412     alt="Powered by HTML Purifier" border="0" /></a>, with this code:
 413     </div>
 414     <pre>&lt;a href=&quot;http://hp.jpsband.org/&quot;&gt;&lt;img
 415 src=&quot;http://hp.jpsband.org/live/art/powered.png&quot;
 416 alt=&quot;Powered by HTML Purifier&quot; border=&quot;0&quot; /&gt;&lt;/a&gt;</pre>
 417 </li>
 418 </ul>
 419
 420 <h2 id="Contact">Contact</h2>
 421
 422 <p>You can send me an email at
 423 <a href="mailto:htmlpurifier@jpsband.org">htmlpurifier@jpsband.org</a>.
 424 However, I prefer that you use the forums for asking general support
 425 questions (response time will be the same, I promise!)
 426 Any emails I receive will be considered public: if I think a
 427 solution I thought up to help you would be particularly useful to others,
 428 expect it to show up on the website.</p>
 429
 430 </div>
 431
 432 </body>
 433 </html>