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[2.1.0] Phorum mod implemented for HTML Purifier. Some other code adjustments were made, they need to be cleaned up.

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git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1267 48356398-32a2-884e-a903-53898d9a118a
This commit is contained in:
Edward Z. Yang 2007-06-28 23:01:27 +00:00
parent a96b5bf612
commit 02051e465c
12 changed files with 953 additions and 7 deletions
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6
NEWS
View File

@ -10,11 +10,17 @@ NEWS ( CHANGELOG and HISTORY ) HTMLPurifier
========================== ==========================
2.1.0, unknown release date 2.1.0, unknown release date
! Phorum mod implemented for HTML Purifier
! With %Core.AggressivelyFixLt, <3 and similar emoticons no longer ! With %Core.AggressivelyFixLt, <3 and similar emoticons no longer
trigger HTML removal in PHP5 (DOMLex). This directive is not necessary trigger HTML removal in PHP5 (DOMLex). This directive is not necessary
for PHP4 (DirectLex). for PHP4 (DirectLex).
- AutoFormatters emit friendly error messages if tags or attributes they - AutoFormatters emit friendly error messages if tags or attributes they
need are not allowed need are not allowed
- ConfigForm's compactification of directive names is now configurable
. HTMLPurifier_Config->getSerial() implemented, this is extremely useful
for output cache invalidation
. ConfigForm printer now can retrieve CSS and JS files as strings, in
case HTML Purifier's directory is not publically accessible
2.0.2, unknown release date 2.0.2, unknown release date
(none) (none)

40
library/HTMLPurifier/Config.php
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@ -75,6 +75,11 @@ class HTMLPurifier_Config
*/ */
var $serials = array(); var $serials = array();
/**
* Serial for entire configuration object
*/
var $serial;
/** /**
* @param $definition HTMLPurifier_ConfigSchema that defines what directives * @param $definition HTMLPurifier_ConfigSchema that defines what directives
* are allowed. * are allowed.
@ -168,6 +173,17 @@ class HTMLPurifier_Config
return $this->serials[$namespace]; return $this->serials[$namespace];
} }
/**
* Returns a md5 signature for the entire configuration object
* that uniquely identifies that particular configuration
*/
function getSerial() {
if (empty($this->serial)) {
$this->serial = md5(serialize($this->getAll()));
}
return $this->serial;
}
/** /**
* Retrieves all directives, organized by namespace * Retrieves all directives, organized by namespace
*/ */
@ -396,6 +412,26 @@ class HTMLPurifier_Config
* @static * @static
*/ */
function loadArrayFromForm($array, $index, $allowed = true, $mq_fix = true) { function loadArrayFromForm($array, $index, $allowed = true, $mq_fix = true) {
$ret = HTMLPurifier_Config::prepareArrayFromForm($array, $index, $allowed, $mq_fix);
$config = HTMLPurifier_Config::create($ret);
return $config;
}
/**
* Merges in configuration values from $_GET/$_POST to object. NOT STATIC.
* @note Same parameters as loadArrayFromForm
*/
function mergeArrayFromForm($array, $index, $allowed = true, $mq_fix = true) {
$ret = HTMLPurifier_Config::prepareArrayFromForm($array, $index, $allowed, $mq_fix);
$this->loadArray($ret);
}
/**
* Prepares an array from a form into something usable for the more
* strict parts of HTMLPurifier_Config
* @static
*/
function prepareArrayFromForm($array, $index, $allowed = true, $mq_fix = true) {
$array = (isset($array[$index]) && is_array($array[$index])) ? $array[$index] : array(); $array = (isset($array[$index]) && is_array($array[$index])) ? $array[$index] : array();
$mq = get_magic_quotes_gpc() && $mq_fix; $mq = get_magic_quotes_gpc() && $mq_fix;
@ -412,9 +448,7 @@ class HTMLPurifier_Config
$value = $mq ? stripslashes($array[$skey]) : $array[$skey]; $value = $mq ? stripslashes($array[$skey]) : $array[$skey];
$ret[$ns][$directive] = $value; $ret[$ns][$directive] = $value;
} }
return $ret;
$config = HTMLPurifier_Config::create($ret);
return $config;
} }
/** /**

2
library/HTMLPurifier/Printer/ConfigForm.css
View File

@ -1,7 +1,7 @@
.hp-config {} .hp-config {}
.hp-config tbody th {text-align:right;} .hp-config tbody th {text-align:right; padding-right:0.5em;}
.hp-config thead, .hp-config .namespace {background:#3C578C; color:#FFF;} .hp-config thead, .hp-config .namespace {background:#3C578C; color:#FFF;}
.hp-config .namespace th {text-align:center;} .hp-config .namespace th {text-align:center;}
.hp-config .verbose {display:none;} .hp-config .verbose {display:none;}

30
library/HTMLPurifier/Printer/ConfigForm.php
View File

@ -23,18 +23,41 @@ class HTMLPurifier_Printer_ConfigForm extends HTMLPurifier_Printer
*/ */
var $name; var $name;
/**
* Whether or not to compress directive names, clipping them off
* after a certain amount of letters
*/
var $compress = false;
/** /**
* @param $name Form element name for directives to be stuffed into * @param $name Form element name for directives to be stuffed into
* @param $doc_url String documentation URL, will have fragment tagged on * @param $doc_url String documentation URL, will have fragment tagged on
* @param $compress Integer max length before compressing a directive name, set to false to turn off
*/ */
function HTMLPurifier_Printer_ConfigForm($name, $doc_url = null) { function HTMLPurifier_Printer_ConfigForm($name, $doc_url = null, $compress = false) {
parent::HTMLPurifier_Printer(); parent::HTMLPurifier_Printer();
$this->docURL = $doc_url; $this->docURL = $doc_url;
$this->name = $name; $this->name = $name;
$this->compress = $compress;
$this->fields['default'] = new HTMLPurifier_Printer_ConfigForm_default(); $this->fields['default'] = new HTMLPurifier_Printer_ConfigForm_default();
$this->fields['bool'] = new HTMLPurifier_Printer_ConfigForm_bool(); $this->fields['bool'] = new HTMLPurifier_Printer_ConfigForm_bool();
} }
/**
* Retrieves styling, in case the directory it's in is not publically
* available
*/
function getCSS() {
return file_get_contents(dirname(__FILE__) . '/ConfigForm.css');
}
/**
* Retrieves JavaScript, in case directory is not public
*/
function getJavaScript() {
return file_get_contents(dirname(__FILE__) . '/ConfigForm.js');
}
/** /**
* Returns HTML output for a configuration form * Returns HTML output for a configuration form
* @param $config Configuration object of current form state * @param $config Configuration object of current form state
@ -98,11 +121,12 @@ class HTMLPurifier_Printer_ConfigForm extends HTMLPurifier_Printer
$ret .= $this->start('a', array('href' => $url)); $ret .= $this->start('a', array('href' => $url));
} }
$attr = array('for' => "{$this->name}:$ns.$directive"); $attr = array('for' => "{$this->name}:$ns.$directive");
// crop directive name if it's too long // crop directive name if it's too long
if (strlen($directive) < 14) { if (!$this->compress || (strlen($directive) < $this->compress)) {
$directive_disp = $directive; $directive_disp = $directive;
} else { } else {
$directive_disp = substr($directive, 0, 12) . '...'; $directive_disp = substr($directive, 0, $this->compress - 2) . '...';
$attr['title'] = $directive; $attr['title'] = $directive;
} }

24
plugins/phorum/config.default.php Normal file
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@ -0,0 +1,24 @@
<?php
if(!defined("PHORUM")) exit;
// default HTML Purifier configuration settings
$config->set('HTML', 'Allowed',
// definitely needed
'a[href|title],blockquote[cite],b,pre,i,p,'.
// common semantic markup
'del,ins,strong,em,'.
// commmon presentational markup
's,strike,sub,sup,u,br,tt,div[class],'. // div because bbcode [quote] uses it
// uncommon semantic markup
'abbr[title],acronym[title],caption,code,dfn,cite,kbd,var,'.
// lists
'dd,dl,dt,ul,li,ol,'.
// tables
'table,tr,tbody,thead,tfoot,td,th');
$config->set('AutoFormat', 'AutoParagraph', true);
$config->set('AutoFormat', 'Linkify', true);
$config->set('HTML', 'Doctype', 'XHTML 1.0 Transitional');
$config->set('Core', 'AggressivelyFixLt', true);
$config->set('Core', 'Encoding', 'iso-8859-1'); // we'll change this eventually

165
plugins/phorum/htmlpurifier.php Normal file
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@ -0,0 +1,165 @@
<?php
/**
* HTML Purifier Phorum Mod. Filter your HTML the Standards-Compliant Way!
*
* This Phorum mod enables users to post raw HTML into Phorum. But never
* fear: with the help of HTML Purifier, this HTML will be beat into
* de-XSSed and standards-compliant form, safe for general consumption.
* It is not recommended, but possible to run this mod in parallel
* with other formatters (in short, please DISABLE the BBcode mod).
*
* For help migrating from your previous markup language to pure HTML
* please check the migrate.bbcode.php file.
*
* Tested with Phorum 5.1.22. This module will almost definitely need
* to be upgraded when Phorum 6 rolls around.
*/
if(!defined('PHORUM')) exit;
// load library
require_once (dirname(__FILE__).'/htmlpurifier/HTMLPurifier.auto.php');
$config_exists = file_exists(dirname(__FILE__) . '/config.php');
if ($config_exists || !isset($PHORUM['mod_htmlpurifier']['config'])) {
$config = HTMLPurifier_Config::createDefault();
include(dirname(__FILE__) . '/config.default.php');
if ($config_exists) {
include(dirname(__FILE__) . '/config.php');
}
} else {
// used cached version that was constructed from web interface
$config = HTMLPurifier_Config::create($PHORUM['mod_htmlpurifier']['config']);
}
HTMLPurifier::getInstance($config);
// increment revision.txt if you want to invalidate the cache
$GLOBALS['PHORUM']['mod_htmlpurifier']['body_cache_serial'] = $config->getSerial();
// load migration
if (file_exists(dirname(__FILE__) . '/migrate.php')) {
include(dirname(__FILE__) . '/migrate.php');
} else {
echo '<strong>Error:</strong> No migration path specified for HTML Purifier, please check
<tt>modes/htmlpurifier/migrate.bbcode.php</tt> for instructions on
how to migrate from your previous markup language.';
exit;
}
/**
* Purifies a data array
*/
function phorum_htmlpurifier($data)
{
$PHORUM = $GLOBALS["PHORUM"];
$purifier =& HTMLPurifier::getInstance();
$cache_serial = $PHORUM['mod_htmlpurifier']['body_cache_serial'];
foreach($data as $message_id => $message){
if(isset($message['body'])){
if (
isset($message['meta']['body_cache']) &&
isset($message['meta']['body_cache_serial']) &&
$message['meta']['body_cache_serial'] == $cache_serial
) {
// cached version is present, bail out early
$data[$message_id]['body'] = $message['meta']['body_cache'];
continue;
}
// migration might edit this array, that's why it's defined
// so early
$updated_message = array();
// create the $body variable
if (
!isset($message['meta']['body_cache_serial'])
) {
// perform migration
$fake_data = array();
$fake_data[$message_id] = $message;
$fake_data = phorum_htmlpurifier_migrate($fake_data);
$body = $fake_data[$message_id]['body'];
$body = str_replace("<phorum break>", "\n", $body); // dupe, but this needs to be applied early
$updated_message['body'] = $body; // save it in
} else {
// reverse Phorum's pre-processing
$body = $message['body'];
// order is important
$body = str_replace(array('&lt;','&gt;','&amp;'), array('<','>','&'), $body);
$body = str_replace("<phorum break>\n", "\n", $body);
}
$body = $purifier->purify($body);
// dynamically update the cache
// this is inefficient on the first read, but the cache
// catches will more than make up for it
// this should ONLY be called on read, for posting and preview
// phorum_htmlpurifier_posting should do the trick
$updated_message['meta'] = $message['meta'];
$updated_message['meta']['body_cache'] = $body;
$updated_message['meta']['body_cache_serial'] = $cache_serial;
phorum_db_update_message($message_id, $updated_message);
// must not get overloaded until after we cache it
$data[$message_id]['body'] = $body;
}
}
return $data;
}
/**
* Generate necessary cache and serial entries when a posting action happens
*/
function phorum_htmlpurifier_posting($message) {
$PHORUM = $GLOBALS["PHORUM"];
$purifier =& HTMLPurifier::getInstance();
$message['meta']['body_cache'] = $purifier->purify($message['body']);
$message['meta']['body_cache_serial'] = $PHORUM['mod_htmlpurifier']['body_cache_serial'];
return $message;
}
/**
* Overload quoting mechanism to prevent default, mail-style quote from happening
*/
function phorum_htmlpurifier_quote($array) {
$PHORUM = $GLOBALS["PHORUM"];
$purifier =& HTMLPurifier::getInstance();
$text = $purifier->purify($array[1]);
return "<blockquote cite=\"$array[0]\">\n$text\n</blockquote>";
}
/**
* Ensure that our format hook is processed last
* @credits <http://secretsauce.phorum.org/snippets/make_bbcode_last_formatter.php.txt>
*/
function phorum_htmlpurifier_common() {
global $PHORUM;
if (! isset($PHORUM['hooks']['format']['mods'])) return;
$hp_idx = null;
$last_idx = null;
foreach ($PHORUM['hooks']['format']['mods'] as $idx => $mod) {
if ($mod == 'htmlpurifier') $hp_idx = $idx;
$last_idx = $idx;
}
if ($hp_idx !== null && $hp_idx != $last_idx) {
$hp_mod = array_splice($PHORUM['hooks']['format']['mods'], $hp_idx, 1);
$PHORUM['hooks']['format']['mods'][] = $hp_mod;
$hp_func = array_splice($PHORUM['hooks']['format']['funcs'], $hp_idx, 1);
$PHORUM['hooks']['format']['funcs'][] = $hp_func;
}
}

504
plugins/phorum/htmlpurifier/LICENSE Normal file
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@ -0,0 +1,504 @@
GNU LESSER GENERAL PUBLIC LICENSE
Version 2.1, February 1999
Copyright (C) 1991, 1999 Free Software Foundation, Inc.
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
Everyone is permitted to copy and distribute verbatim copies
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as the successor of the GNU Library Public License, version 2, hence
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That's all there is to it!

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The contents of the library/ folder should be here.

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hook: format|phorum_htmlpurifier
hook: quote|phorum_htmlpurifier_quote
hook: posting_custom_action|phorum_htmlpurifier_posting
hook: common|phorum_htmlpurifier_common
title: HTML Purifier Phorum Mod
desc: This module enables standards-compliant HTML filtering on Phorum. Please check migrate.bbcode.php before enabling this mod.

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HTML Purifier Phorum Mod - Filter your HTML the Standards-Compliant Way!
This Phorum mod enables HTML posting on Phorum. Under normal circumstances,
this would cause a huge security risk, but because we are running
HTML through HTML Purifier, output is guaranteed to be XSS free and
standards-compliant.
This mod requires HTML input, and previous markup languages need to be
converted accordingly. Thus, it is vital that you create a 'migrate.php'
file that works with your installation. If you're using the built-in
BBCode formatting, simply move migrate.bbcode.php to that place; for
other markup languages, consult said file for instructions on how
to adapt it to your needs.
This module will not work if 'migrate.php' is not created, and an improperly
made migration file may *CORRUPT* Phorum, so please take your time to
do this correctly. It should go without saying to *BACKUP YOUR DATABASE*
before attempting anything here.
The version of HTML Purifier bundled with is a custom modified 2.0.1.
Do not attempt to replace it with a version equal to or less than
downloaded from the HTML Purifier website: the module will combust
spectacularly. (Greater versions, however, are okay, because the changes
made to accomodate this module have been committed to the trunk).
Visit HTML Purifier at <http://htmlpurifier.org/>. May the force
be with you.

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<?php
/**
* This file is responsible for migrating from a specific markup language
* like BBCode or Markdown to HTML. WARNING: THIS PROCESS IS NOT REVERSIBLE
*
* Copy this file to 'migrate.php' and it will automatically work for
* BBCode; you may need to tweak this a little to get it to work for other
* languages (usually, just replace the include name and the function name).
*
* If you do NOT want to have any migration performed (for instance, you
* are installing the module on a new forum with no posts), simply remove
* phorum_htmlpurifier_migrate() function. You still need migrate.php
* present, otherwise the module won't work.
*/
if(!defined("PHORUM")) exit;
require_once(dirname(__FILE__) . "/../bbcode/bbcode.php");
/**
* 'format' hook style function that will be called to convert
* legacy markup into HTML.
*/
function phorum_htmlpurifier_migrate($data) {
return phorum_bb_code($data); // bbcode's 'format' hook
}

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<?php
// based off of BBCode's settings file
/**
* HTML Purifier Phorum mod settings configuration. This provides
* a convenient web-interface for editing the most common HTML Purifier
* configuration directives. You can also specify custom configuration
* by creating a 'config.php' file.
*/
if(!defined("PHORUM_ADMIN")) exit;
// load library
require_once (dirname(__FILE__).'/htmlpurifier/HTMLPurifier.auto.php');
// define friendly configuration directives
$directives = array(
'URI.Host', // auto-detectable
'URI.DisableExternal',
'URI.DisableExternalResources',
'URI.DisableResources',
'URI.Munge',
'URI.HostBlacklist',
'URI.Disable',
'HTML.TidyLevel',
'HTML.Doctype', // auto-detectable
'HTML.Allowed',
'AutoFormat',
'-AutoFormat.Custom',
'-AutoFormat.PurifierLinkify',
'Output.TidyFormat',
);
// instantiate $config object
$config_exists = file_exists(dirname(__FILE__) . '/config.php');
if ($config_exists || !isset($PHORUM['mod_htmlpurifier']['config'])) {
$config = HTMLPurifier_Config::createDefault();
include(dirname(__FILE__) . '/config.default.php');
if ($config_exists) {
include(dirname(__FILE__) . '/config.php');
}
unset($PHORUM['mod_htmlpurifier']['config']); // unnecessary
} else {
$config = HTMLPurifier_Config::create($PHORUM['mod_htmlpurifier']['config']);
}
// save settings
if(!empty($_POST)){
if ($config_exists) {
echo "Cannot update settings, <code>mods/htmlpurifier/config.php</code> already exists. To change
settings, edit that file. To use the web form, delete that file.<br />";
} else {
$config->mergeArrayFromForm($_POST, 'config', $directives);
$PHORUM['mod_htmlpurifier']['config'] = $config->getAll();
if(!phorum_db_update_settings(array("mod_htmlpurifier"=>$PHORUM["mod_htmlpurifier"]))){
$error="Database error while updating settings.";
} else {
echo "Settings Updated<br />";
}
}
}
// warning that's used by both messages
$warning = "
<strong>Warning: Changing HTML Purifier's configuration will invalidate
the cache. Expect to see a flurry of database activity after you change
any of these settings.</strong>
";
if ($config_exists) {
// clear out mod_htmlpurifier for housekeeping
phorum_db_update_settings(array("mod_htmlpurifier"=>$PHORUM["mod_htmlpurifier"]));
// politely tell user how to edit settings manually
?>
<div class="input-form-td-break">How to edit settings for HTML Purifier module</div>
<p>
A <tt>config.php</tt> file exists in your <tt>mods/htmlpurifier/</tt>
directory. This file contains your custom configuration: in order to
change it, please navigate to that file and edit it accordingly.
</p>
<p>
To use the web interface, delete <tt>config.php</tt> (or rename it to
<tt>config.php.bak</tt>).
</p>
<p>
<?php echo $warning ?>
</p>
<?php
} else {
// output form
require_once './include/admin/PhorumInputForm.php';
$frm = new PhorumInputForm ("", "post", "Save");
$frm->hidden("module", "modsettings");
$frm->hidden("mod", "htmlpurifier"); // this is the directory name that the Settings file lives in
if (!empty($error)){
echo "$error<br />";
}
$frm->addbreak("Edit settings for the HTML Purifier module");
$frm->addMessage('<p>Click on directive links to read what each option does.
<strong>Warning: This will navigate you to a new page.</strong></p>
<p>For more flexibility (for instance, you want to edit the full
range of configuration directives), you can create a <tt>config.php</tt>
file in your <tt>mods/htmlpurifier/</tt> directory. Doing so will,
however, make the web configuration interface unavailable.</p>');
require_once 'HTMLPurifier/Printer/ConfigForm.php';
$htmlpurifier_form = new HTMLPurifier_Printer_ConfigForm('config', 'http://htmlpurifier.org/live/configdoc/plain.html#%s');
$frm->addMessage($htmlpurifier_form->render($config, $directives, false));
$frm->addMessage($warning);
// hack to include extra styling
echo '<style type="text/css">' . $htmlpurifier_form->getCSS() . '
.hp-config {margin-left:auto;margin-right:auto;}
</style>';
$js = $htmlpurifier_form->getJavaScript();
echo '<script type="text/javascript">'."<!--\n$js\n//-->".'</script>';
$frm->show();
}