forked from extern/egroupware
166 lines
6.9 KiB
PHP
166 lines
6.9 KiB
PHP
<?php
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/**
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* eGroupWare API: egw class to include (and configure (basic)) htmLawed by Santosh Patnaik
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*
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* @link http://www.egroupware.org
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* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
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* @package api
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* @subpackage htmLawed
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* @author Klaus Leithoff <kl-AT-stylite.de>
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* @version $Id$
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*/
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require_once(EGW_API_INC.'/htmLawed/htmLawed.php');
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/**
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* This class does NOT use anything EGroupware specific, it just calls htmLawed and supports autoloading
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* while matching egw namespace requirements. It also provides (as a non class function ) a hook_tag function
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* to do further tag / attribute validation
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*/
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class egw_htmLawed
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{
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/**
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* config options see constructor
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*
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* @var Configuration
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*/
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var $Configuration;
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/**
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* The $spec argument can be used to disallow an otherwise legal attribute for an element,
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* or to restrict the attribute's values. This can also be helpful as a security measure
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* (e.g., in certain versions of browsers, certain values can cause buffer overflows and
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* denial of service attacks), or in enforcing admin policy compliance. $spec is specified
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* as a string of text containing one or more rules, with multiple rules separated from each
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* other by a semi-colon (;)
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*
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* @var Spec
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*/
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var $Spec;
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/**
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* Constructor
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*/
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function __construct()
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{
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// may hold some Standard configuration
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/*
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$cfg = array(
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'abs_url'=>array('3', '0', 'absolute/relative URL conversion', '-1'),
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'and_mark'=>array('2', '0', 'mark original <em>&</em> chars', '0', 'd'=>1), // 'd' to disable
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'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>'))),
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'anti_mail_spam'=>array('1', '0', 'replace <em>@</em> in <em>mailto:</em> URLs', '0', '8', 'NO@SPAM', 'replacement'),
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'balance'=>array('2', '1', 'fix nestings and balance tags', '0'),
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'base_url'=>array('', '', 'base URL', '25'),
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'cdata'=>array('4', 'nil', 'allow <em>CDATA</em> sections', 'nil'),
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'clean_ms_char'=>array('3', '0', 'replace bad characters introduced by Microsoft apps. like <em>Word</em>', '0'),
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'comment'=>array('4', 'nil', 'allow HTML comments', 'nil'),
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'css_expression'=>array('2', 'nil', 'allow dynamic expressions in CSS style properties', 'nil'),
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'deny_attribute'=>array('1', '0', 'denied attributes', '0', '50', '', 'these'),
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'direct_list_nest'=>array('2', 'nil', 'allow direct nesting of a list within another without requiring it to be a list item', 'nil'),
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'elements'=>array('', '', 'allowed elements', '50'),
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'hexdec_entity'=>array('3', '1', 'convert hexadecimal numeric entities to decimal ones, or vice versa', '0'),
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'hook'=>array('', '', 'name of hook function', '25'),
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'hook_tag'=>array('', '', 'name of custom function to further check attribute values', '25'),
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'keep_bad'=>array('7', '6', 'keep, or remove <em>bad</em> tag content', '0'),
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'lc_std_val'=>array('2', '1', 'lower-case std. attribute values like <em>radio</em>', '0'),
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'make_tag_strict'=>array('3', 'nil', 'transform deprecated elements', 'nil'),
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'named_entity'=>array('2', '1', 'allow named entities, or convert numeric ones', '0'),
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'no_deprecated_attr'=>array('3', '1', 'allow deprecated attributes, or transform them', '0'),
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'parent'=>array('', 'div', 'name of parent element', '25'),
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'safe'=>array('2', '0', 'for most <em>safe</em> HTML', '0'),
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'schemes'=>array('', 'href: aim, feed, file, ftp, gopher, http, https, irc, mailto, news, nntp, sftp, ssh, telnet; *:file, http, https', 'allowed URL protocols', '50'),
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'show_setting'=>array('', 'htmLawed_setting', 'variable name to record <em>finalized</em> htmLawed settings', '25', 'd'=>1),
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'style_pass'=>array('2', 'nil', 'do not look at <em>style</em> attribute values', 'nil'),
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'tidy'=>array('3', '0', 'beautify/compact', '-1', '8', '1t1', 'format'),
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'unique_ids'=>array('2', '1', 'unique <em>id</em> values', '0', '8', 'my_', 'prefix'),
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'valid_xhtml'=>array('2', 'nil', 'auto-set various parameters for most valid XHTML', 'nil'),
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'xml:lang'=>array('3', 'nil', 'auto-add <em>xml:lang</em> attribute', '0'),
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);
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*/
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$this->Configuration = array('comment'=>0,
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'balance'=>1,
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'tidy'=>1,
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'elements' => "* -script",
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'schemes'=>'href: file, ftp, http, https, mailto; src: cid, data, file, ftp, http, https; *:file, http, https',
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'hook_tag' =>"hl_my_tag_transform",
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);
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$this->Spec = 'img=alt(noneof="image"/default="")';
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}
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/**
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* egw_htmlLawed
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*
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* @param varchar $html2check =text input Text to check
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* @param mixed $Config = text or array
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* @param mixed $Spec =text or array; The '$spec' argument can be used to disallow an otherwise legal attribute for an element
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* @return varchar cleaned/fixed html
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*/
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function egw_htmLawed($html2check, $Config=null, $Spec=array())
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{
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if (is_array($Config) && is_array($this->Configuration)) $Config = array_merge($this->Configuration, $Config);
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if (empty($Config)) $Config = $this->Configuration;
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if (empty($Spec)) $Spec = $this->Spec;
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return htmLawed($html2check, $Config, $Spec);
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}
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}
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/**
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* hl_my_tag_transform
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*
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* function to provide individual checks for element attribute pairs
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* implemented so far: img checking for alt attribute == image; set this to empty
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*/
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function hl_my_tag_transform($element, $attribute_array)
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{
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//error_log(__METHOD__.__LINE__." ".$element.'->'.array2string($attribute_array));
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// Elements other than 'img' or 'img' without a 'img' attribute are returned unchanged
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if($element == 'img' && isset($attribute_array['alt']))
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{
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// Re-build 'alt'
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$attribute_array['alt'] = ($attribute_array['alt']=='image'?'':$attribute_array['alt']);
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}
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/*
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// Elements other than 'span' or 'span' without a 'style' attribute are returned unchanged
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if($element == 'span' && isset($attribute_array['style']))
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{
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// Identify CSS properties and values
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$css = explode(';', $attribute_array['style']);
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$style = array();
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foreach($css as $v){
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if(($p = strpos($v, ':')) > 1 && $p < strlen($v)){
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$css_property_name = trim(substr($v, 0, $p));
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$css_property_value = trim(substr($v, $p+1));
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$style[] = "$css_property_name: $css_property_value";
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}
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}
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// Alter the CSS property as required
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// Black Arial must be at a font-size of 24
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if(isset($style['font-family']) && $style['font-family'] == 'Arial' && isset($style['color']) && $style['color'] == '#000000'){
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$style['font-size'] == '24';
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}
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// And so on for other criteria
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// ...
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// Re-build 'style'
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$attribute_array['style'] = implode('; ', $style);
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}
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*/
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// Build the attributes string
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$attributes = '';
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foreach($attribute_array as $k=>$v){
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$attributes .= " {$k}=\"{$v}\"";
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}
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// Return the opening tag with attributes
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static $empty_elements = array('area'=>1, 'br'=>1, 'col'=>1, 'embed'=>1, 'hr'=>1, 'img'=>1, 'input'=>1, 'isindex'=>1, 'param'=>1);
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return "<{$element}{$attributes}". (isset($empty_elements[$element]) ? ' /' : ''). '>';
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}
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