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<?php
/**
* Elgg htmLawed tag filtering.
*
* @package ElgghtmLawed
* @author Curverider Ltd
* @author Brett Profitt
* @link http://elgg.com/
*/
/**
* Initialise plugin
*
*/
function htmlawed_init() {
/** For now declare allowed tags and protocols here, TODO: Make this configurable */
global $CONFIG;
$CONFIG->htmlawed_config = array(
// seems to handle about everything we need.
'safe' => true,
'deny_attribute' => 'class, on*',
'hook_tag' => 'htmlawed_hook',
'schemes' => '*:http,https,ftp,news,mailto,rtsp,teamspeak,gopher,mms,callto'
// apparent this doesn't work.
//. 'style:color,cursor,text-align,font-size,font-weight,font-style,border,margin,padding,float'
);
register_plugin_hook('validate', 'input', 'htmlawed_filter_tags', 1);
}
/**
* Hooked for all elements in htmlawed.
* Used to filter out style attributes we don't want.
*
* @param $element
* @param $attribute_array
* @return unknown_type
*/
function htmlawed_hook($element, $attribute_array) {
// these are the default styles used by tinymce.
$allowed_styles = array(
'color', 'cursor', 'text-align', 'vertical-align', 'font-size',
'font-weight', 'font-style', 'border', 'border-top', 'background-color',
'border-bottom', 'border-left', 'border-right',
'margin', 'margin-top', 'margin-bottom', 'margin-left',
'margin-right', 'padding', 'float', 'text-decoration'
);
// must return something.
$string = '';
foreach ($attribute_array as $attr => $value) {
if ($attr == 'style') {
$styles = explode(';', $value);
$style_str = '';
foreach ($styles as $style) {
if (!trim($style)) {
continue;
}
list($style_attr, $style_value) = explode(':', trim($style));
$style_attr = trim($style_attr);
$style_value = trim($style_value);
if (in_array($style_attr, $allowed_styles)) {
$style_str .= "$style_attr: $style_value; ";
}
}
if ($style_str) {
$string .= " style=\"$style_str\"";
}
} else {
$string .= " $attr=\"$value\"";
}
}
// some things (tinymce) don't like tags like <p > so make sure
// to only add a space if needed.
if ($string = trim($string)) {
$string = " $string";
}
$r = "<$element$string>";
return $r;
}
/**
* htmLawed filtering of tags, called on a plugin hook
*
* @param mixed $var Variable to filter
* @return mixed
*/
function htmlawed_filter_tags($hook, $entity_type, $returnvalue, $params) {
$return = $returnvalue;
$var = $returnvalue;
if (include_once(dirname(__FILE__) . "/vendors/htmLawed/htmLawed.php")) {
global $CONFIG;
$htmlawed_config = $CONFIG->htmlawed_config;
if (!is_array($var)) {
$return = "";
$return = htmLawed($var, $htmlawed_config);
} else {
$return = array();
foreach($var as $key => $el) {
$return[$key] = htmLawed($el, $htmlawed_config);
}
}
}
return $return;
}
register_elgg_event_handler('init', 'system', 'htmlawed_init');
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