some important stuff we'll need

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+
+MODx Plugin
+
+MODx <http://www.modxcms.com/> is an open source PHP application framework.
+I first came across them in my referrer logs when tillda asked if anyone
+could implement an HTML Purifier plugin.  This forum thread
+<http://modxcms.com/forums/index.php/topic,6604.0.html> eventually resulted
+in the fruition of this plugin that davidm says, "is on top of my favorite
+list."  HTML Purifier goes great with WYSIWYG editors!
+
+
+
+1. Credits
+
+PaulGregory wrote the overall structure of the code.  I added the
+slashes hack.
+
+
+
+2. Install
+
+First, you need to place HTML Purifier library somewhere.  The code here
+assumes that you've placed in MODx's assets/plugins/htmlpurifier (no version
+number).
+
+Log into the manager, and navigate:
+
+Resources > Manage Resources > Plugins tab > New Plugin
+
+Type in a name (probably HTML Purifier), and copy paste this code into the
+textarea:
+
+--------------------------------------------------------------------------------
+$e = &$modx->Event;
+if ($e->name == 'OnBeforeDocFormSave') {
+    global $content;
+
+    include_once '../assets/plugins/htmlpurifier/library/HTMLPurifier.auto.php';
+    $purifier = new HTMLPurifier();
+
+    static $magic_quotes = null;
+    if ($magic_quotes === null) {
+        // this is an ugly hack because this hook hasn't
+        // had the backslashes removed yet when magic_quotes_gpc is on,
+        // but HTMLPurifier must not have the quotes slashed.
+        $magic_quotes = get_magic_quotes_gpc();
+    }
+
+    if ($magic_quotes) $content = stripslashes($content);
+    $content = $purifier->purify($content);
+    if ($magic_quotes) $content = addslashes($content);
+}
+--------------------------------------------------------------------------------
+
+Then navigate to the System Events tab and check "OnBeforeDocFormSave".
+Save the plugin.  HTML Purifier now is integrated!
+
+
+
+3. Making sure it works
+
+You can test HTML Purifier by deliberately putting in crappy HTML and seeing
+whether or not it gets fixed.  A better way is to put in something like this:
+
+<p lang="fr">Il est bon</p>
+
+...and seeing whether or not the content comes out as:
+
+<p lang="fr" xml:lang="fr">Il est bon</p>
+
+(lang to xml:lang synchronization is one of the many features HTML Purifier
+has).
+
+
+
+4. Caveat Emptor
+
+This code does not intercept save requests from the QuickEdit plugin, this may
+be added in a later version.  It also modifies things on save, so there's a
+slight chance that HTML Purifier may make a boo-boo and accidently mess things
+up (the original version is not saved).
+
+Finally, make sure that MODx is using UTF-8.  If you are using, say, a French
+localisation, you may be using Latin-1, if that's the case, configure
+HTML Purifier properly like this:
+
+$config = HTMLPurifier_Config::createDefault();
+$config->set('Core', 'Encoding', 'ISO-8859-1'); // or whatever encoding
+$purifier = new HTMLPurifier($config);
+
+
+
+5. Known Bugs
+
+'rn' characters sometimes mysteriously appear after purification. We are
+currently investigating this issue. See: <http://htmlpurifier.org/phorum/read.php?3,1866>
+
+
+
+6. See Also
+
+A modified version of Jot 1.1.3 is available, which integrates with HTML
+Purifier. You can check it out here: <http://modxcms.com/forums/index.php/topic,25621.msg161970.html>
+
+
+X. Changelog
+
+2008-06-16
+- Updated code to work with 3.1.0 and later
+- Add Known Bugs and See Also section
+
+    vim: et sw=4 sts=4