mirror of
https://github.com/EGroupware/egroupware.git
synced 2024-12-23 15:18:58 +01:00
286 lines
12 KiB
PHP
286 lines
12 KiB
PHP
<?php
|
|
/**
|
|
* eGroupWare API: egw class to include (and configure (basic)) htmLawed by Santosh Patnaik
|
|
*
|
|
* @link http://www.egroupware.org
|
|
* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
|
|
* @package api
|
|
* @subpackage htmLawed
|
|
* @author Klaus Leithoff <kl-AT-stylite.de>
|
|
* @version $Id$
|
|
*/
|
|
|
|
require_once(EGW_API_INC.'/htmLawed/htmLawed.php');
|
|
|
|
/**
|
|
* This class does NOT use anything EGroupware specific, it just calls htmLawed and supports autoloading
|
|
* while matching egw namespace requirements. It also provides (as a non class function ) a hook_tag function
|
|
* to do further tag / attribute validation
|
|
*/
|
|
class egw_htmLawed
|
|
{
|
|
/**
|
|
* config options see constructor
|
|
*
|
|
* @var Configuration
|
|
*/
|
|
var $Configuration;
|
|
|
|
/**
|
|
* The $spec argument can be used to disallow an otherwise legal attribute for an element,
|
|
* or to restrict the attribute's values. This can also be helpful as a security measure
|
|
* (e.g., in certain versions of browsers, certain values can cause buffer overflows and
|
|
* denial of service attacks), or in enforcing admin policy compliance. $spec is specified
|
|
* as a string of text containing one or more rules, with multiple rules separated from each
|
|
* other by a semi-colon (;)
|
|
*
|
|
* @var Spec
|
|
*/
|
|
var $Spec;
|
|
|
|
/**
|
|
* Constructor
|
|
*/
|
|
function __construct()
|
|
{
|
|
// may hold some Standard configuration
|
|
/*
|
|
$cfg = array(
|
|
'abs_url'=>array('3', '0', 'absolute/relative URL conversion', '-1'),
|
|
'and_mark'=>array('2', '0', 'mark original <em>&</em> chars', '0', 'd'=>1), // 'd' to disable
|
|
'anti_link_spam'=>array('1', '0', 'modify <em>href</em> values as an anti-link spam measure', '0', array(array('30', '1', '', 'regex for extra <em>rel</em>'), array('30', '2', '', 'regex for no <em>href</em>'))),
|
|
'anti_mail_spam'=>array('1', '0', 'replace <em>@</em> in <em>mailto:</em> URLs', '0', '8', 'NO@SPAM', 'replacement'),
|
|
'balance'=>array('2', '1', 'fix nestings and balance tags', '0'),
|
|
'base_url'=>array('', '', 'base URL', '25'),
|
|
'cdata'=>array('4', 'nil', 'allow <em>CDATA</em> sections', 'nil'),
|
|
'clean_ms_char'=>array('3', '0', 'replace bad characters introduced by Microsoft apps. like <em>Word</em>', '0'),
|
|
'comment'=>array('4', 'nil', 'allow HTML comments', 'nil'),
|
|
'css_expression'=>array('2', 'nil', 'allow dynamic expressions in CSS style properties', 'nil'),
|
|
'deny_attribute'=>array('1', '0', 'denied attributes', '0', '50', '', 'these'),
|
|
'direct_list_nest'=>array('2', 'nil', 'allow direct nesting of a list within another without requiring it to be a list item', 'nil'),
|
|
'elements'=>array('', '', 'allowed elements', '50'),
|
|
'hexdec_entity'=>array('3', '1', 'convert hexadecimal numeric entities to decimal ones, or vice versa', '0'),
|
|
'hook'=>array('', '', 'name of hook function', '25'),
|
|
'hook_tag'=>array('', '', 'name of custom function to further check attribute values', '25'),
|
|
'keep_bad'=>array('7', '6', 'keep, or remove <em>bad</em> tag content', '0'),
|
|
'lc_std_val'=>array('2', '1', 'lower-case std. attribute values like <em>radio</em>', '0'),
|
|
'make_tag_strict'=>array('3', 'nil', 'transform deprecated elements', 'nil'),
|
|
'named_entity'=>array('2', '1', 'allow named entities, or convert numeric ones', '0'),
|
|
'no_deprecated_attr'=>array('3', '1', 'allow deprecated attributes, or transform them', '0'),
|
|
'parent'=>array('', 'div', 'name of parent element', '25'),
|
|
'safe'=>array('2', '0', 'for most <em>safe</em> HTML', '0'),
|
|
'schemes'=>array('', 'href: aim, feed, file, ftp, gopher, http, https, irc, mailto, news, nntp, sftp, ssh, telnet; *:file, http, https', 'allowed URL protocols', '50'),
|
|
'show_setting'=>array('', 'htmLawed_setting', 'variable name to record <em>finalized</em> htmLawed settings', '25', 'd'=>1),
|
|
'style_pass'=>array('2', 'nil', 'do not look at <em>style</em> attribute values', 'nil'),
|
|
'tidy'=>array('3', '0', 'beautify/compact', '-1', '8', '1t1', 'format'),
|
|
'unique_ids'=>array('2', '1', 'unique <em>id</em> values', '0', '8', 'my_', 'prefix'),
|
|
'valid_xhtml'=>array('2', 'nil', 'auto-set various parameters for most valid XHTML', 'nil'),
|
|
'xml:lang'=>array('3', 'nil', 'auto-add <em>xml:lang</em> attribute', '0'),
|
|
'allow_for_inline' => array('table'),//block elements allowed for nesting when only inline is allowed; Example span does not allow block elements as table; table is the only element tested so far
|
|
);
|
|
*/
|
|
|
|
$this->Configuration = array('comment'=>1, //remove comments
|
|
'balance'=>0,//turn off tag-balancing (config['balance']=>0). That will not introduce any security risk; only standards-compliant tag nesting check/filtering will be turned off (basic tag-balance will remain; i.e., there won't be any unclosed tag, etc., after filtering)
|
|
'tidy'=>1,
|
|
'elements' => "* -script",
|
|
'deny_attribute' => 'on*',
|
|
'schemes'=>'href: file, ftp, http, https, mailto; src: cid, data, file, ftp, http, https; *:file, http, https',
|
|
'hook_tag' =>"hl_my_tag_transform",
|
|
);
|
|
$this->Spec = 'img=alt(noneof="image"/default="")';
|
|
}
|
|
|
|
/**
|
|
* egw_htmlLawed
|
|
*
|
|
* @param varchar $html2check =text input Text to check
|
|
* @param mixed $Config = text or array
|
|
* @param mixed $Spec =text or array; The '$spec' argument can be used to disallow an otherwise legal attribute for an element
|
|
* @return varchar cleaned/fixed html
|
|
*/
|
|
function egw_htmLawed($html2check, $Config=null, $Spec=array())
|
|
{
|
|
//error_log(__METHOD__.__LINE__.' Input:'.$html2check);
|
|
if (is_array($Config) && is_array($this->Configuration)) $Config = array_merge($this->Configuration, $Config);
|
|
if (empty($Config)) $Config = $this->Configuration;
|
|
if (empty($Spec)) $Spec = $this->Spec;
|
|
|
|
return htmLawed($html2check, $Config, $Spec);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* hl_my_tag_transform
|
|
*
|
|
* function to provide individual checks for element attribute pairs
|
|
* implemented so far: img checking for alt attribute == image; set this to empty
|
|
* a checking for title, replacing @
|
|
* blockquote checking for cite, replacing @
|
|
*/
|
|
function hl_my_tag_transform($element, $attribute_array=0)
|
|
{
|
|
// If second argument is not received, it means a closing tag is being handled
|
|
if(is_numeric($attribute_array)){
|
|
return "</$element>";
|
|
}
|
|
|
|
//if ($element=='img') error_log(__METHOD__.__LINE__." ".$element.'->'.array2string($attribute_array));
|
|
// Elements other than 'img' or 'img' without a 'img' attribute are returned unchanged
|
|
if($element == 'img')
|
|
{
|
|
// Re-build 'alt'
|
|
if (isset($attribute_array['alt'])) $attribute_array['alt'] = ($attribute_array['alt']=='image'?'':$attribute_array['alt']);
|
|
if (isset($attribute_array['alt'])&&strpos($attribute_array['alt'],'@')!==false) $attribute_array['alt']=str_replace('@','(at)',$attribute_array['alt']);
|
|
}
|
|
if (isset($attribute_array['title']))
|
|
{
|
|
if (strpos($attribute_array['title'],'@')!==false) $attribute_array['title']=str_replace('@','(at)',$attribute_array['title']);
|
|
}
|
|
if ($element == 'blockquote')
|
|
{
|
|
if (isset($attribute_array['cite']))
|
|
{
|
|
if (strpos($attribute_array['cite'],'@')!==false) $attribute_array['cite']=str_replace('@','(at)',$attribute_array['cite']);
|
|
}
|
|
}
|
|
/*
|
|
// Elements other than 'span' or 'span' without a 'style' attribute are returned unchanged
|
|
if($element == 'span' && isset($attribute_array['style']))
|
|
{
|
|
// Identify CSS properties and values
|
|
$css = explode(';', $attribute_array['style']);
|
|
$style = array();
|
|
foreach($css as $v){
|
|
if(($p = strpos($v, ':')) > 1 && $p < strlen($v)){
|
|
$css_property_name = trim(substr($v, 0, $p));
|
|
$css_property_value = trim(substr($v, $p+1));
|
|
$style[] = "$css_property_name: $css_property_value";
|
|
}
|
|
}
|
|
|
|
// Alter the CSS property as required
|
|
|
|
// Black Arial must be at a font-size of 24
|
|
if(isset($style['font-family']) && $style['font-family'] == 'Arial' && isset($style['color']) && $style['color'] == '#000000'){
|
|
$style['font-size'] == '24';
|
|
}
|
|
|
|
// And so on for other criteria
|
|
// ...
|
|
|
|
// Re-build 'style'
|
|
$attribute_array['style'] = implode('; ', $style);
|
|
}
|
|
*/
|
|
|
|
// Build the attributes string
|
|
$attributes = '';
|
|
foreach($attribute_array as $k=>$v){
|
|
$attributes .= " {$k}=\"{$v}\"";
|
|
}
|
|
|
|
// Return the opening tag with attributes
|
|
static $empty_elements = array('area'=>1, 'br'=>1, 'col'=>1, 'embed'=>1, 'hr'=>1, 'img'=>1, 'input'=>1, 'isindex'=>1, 'param'=>1);
|
|
return "<{$element}{$attributes}". (isset($empty_elements[$element]) ? ' /' : ''). '>';
|
|
}
|
|
|
|
/**
|
|
* hl_email_tag_transform
|
|
*
|
|
* function to provide individual checks for element attribute pairs
|
|
* implemented so far: img -checking for alt attribute == image; set this to empty
|
|
* -control for/on external Images and src-length
|
|
* a -checking for title and href, replacing @ accordingly
|
|
* -navigate to local anchors without reloading the page
|
|
* blockquote -checking for cite, replacing @
|
|
* throwing away excess div elements, that carry no style or class or id info
|
|
*/
|
|
function hl_email_tag_transform($element, $attribute_array=0)
|
|
{
|
|
static $lastelement;
|
|
static $throwawaycounter;
|
|
if (is_null($throwawaycounter)) $throwawaycounter = 0;
|
|
//if ($throwawaycounter>250) error_log(__METHOD__.__LINE__.' '.$throwawaycounter);
|
|
if ($element=='div' && $element==$lastelement && ($attribute_array==0 || empty($attribute_array)))
|
|
{
|
|
if (is_array($attribute_array)) $throwawaycounter++;
|
|
if ($attribute_array==0 && $throwawaycounter>0) $throwawaycounter--;
|
|
if ($throwawaycounter>0) return '';
|
|
}
|
|
if (is_array($attribute_array) && !empty($attribute_array) && $element=='div')
|
|
{
|
|
$lastelement = 'div_with_attr';
|
|
}
|
|
else
|
|
{
|
|
$lastelement = $element;
|
|
}
|
|
// If second argument is not received, it means a closing tag is being handled
|
|
if(is_numeric($attribute_array)){
|
|
return "</$element>";
|
|
}
|
|
|
|
//if ($element=='a') error_log(__METHOD__.__LINE__." ".$element.'->'.array2string($attribute_array));
|
|
// Elements other than 'img' or 'img' without a 'img' attribute are returned unchanged
|
|
if($element == 'img')
|
|
{
|
|
// Re-build 'alt'
|
|
if (isset($attribute_array['alt'])) $attribute_array['alt'] = ($attribute_array['alt']=='image'?'':$attribute_array['alt']);
|
|
if (isset($attribute_array['alt'])&&strpos($attribute_array['alt'],'@')!==false) $attribute_array['alt']=str_replace('@','(at)',$attribute_array['alt']);
|
|
// $GLOBALS['egw_info']['user']['preferences']['felamimail']['allowExternalIMGs'] ? '' : 'match' => '/^cid:.*/'),
|
|
if (isset($attribute_array['src']))
|
|
{
|
|
if (!(strlen($attribute_array['src'])>4 && strlen($attribute_array['src']<400)))
|
|
{
|
|
$attribute_array['alt']= $attribute_array['alt'].' [blocked (reason: url length):'.$attribute_array['src'].']';
|
|
if (!isset($attribute_array['title'])) $attribute_array['title']=$attribute_array['alt'];
|
|
$attribute_array['src']=common::image('phpgwapi','dialog_error');
|
|
}
|
|
if (!$GLOBALS['egw_info']['user']['preferences']['felamimail']['allowExternalIMGs'])
|
|
{
|
|
if (!preg_match('/^cid:.*/',$attribute_array['src']))
|
|
{
|
|
$attribute_array['alt']= $attribute_array['alt'].' [blocked external image:'.$attribute_array['src'].']';
|
|
if (!isset($attribute_array['title'])) $attribute_array['title']=$attribute_array['alt'];
|
|
$attribute_array['src']=common::image('phpgwapi','dialog_error');
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if (isset($attribute_array['title']))
|
|
{
|
|
if (strpos($attribute_array['title'],'@')!==false) $attribute_array['title']=str_replace('@','(at)',$attribute_array['title']);
|
|
}
|
|
if ($element == 'blockquote')
|
|
{
|
|
if (isset($attribute_array['cite']))
|
|
{
|
|
if (strpos($attribute_array['cite'],'@')!==false) $attribute_array['cite']=str_replace('@','(at)',$attribute_array['cite']);
|
|
}
|
|
}
|
|
if($element == 'a')
|
|
{
|
|
//error_log(array2string($attribute_array));
|
|
if (strpos($attribute_array['href'],'denied:javascript')===0) $attribute_array['href']='';
|
|
if (isset($attribute_array['name']) && isset($attribute_array['id'])) $attribute_array['id'] = $attribute_array['name'];
|
|
if (strpos($attribute_array['href'],'@')!==false) $attribute_array['href'] = str_replace('@','%40',$attribute_array['href']);
|
|
if (strpos($attribute_array['href'],'#')===0)
|
|
{
|
|
$attribute_array['href'] = "javascript:GoToAnchor('".trim(substr($attribute_array['href'],1))."');";
|
|
}
|
|
|
|
}
|
|
|
|
// Build the attributes string
|
|
$attributes = '';
|
|
foreach($attribute_array as $k=>$v){
|
|
$attributes .= " {$k}=\"{$v}\"";
|
|
}
|
|
|
|
// Return the opening tag with attributes
|
|
static $empty_elements = array('area'=>1, 'br'=>1, 'col'=>1, 'embed'=>1, 'hr'=>1, 'img'=>1, 'input'=>1, 'isindex'=>1, 'param'=>1);
|
|
return "<{$element}{$attributes}". (isset($empty_elements[$element]) ? ' /' : ''). '>';
|
|
}
|
|
|