From 0d329d2421f7040c45c3587bcd1655d28da7bd4c Mon Sep 17 00:00:00 2001
From: brettp <brettp@36083f99-b078-4883-b0ff-0f9b5a30f544>
Date: Mon, 2 Nov 2009 20:48:58 +0000
Subject: Updated htmlawed to disallow many style attributes.

git-svn-id: http://code.elgg.org/elgg/trunk@3612 36083f99-b078-4883-b0ff-0f9b5a30f544
---
 mod/htmlawed/start.php | 72 +++++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 57 insertions(+), 15 deletions(-)

(limited to 'mod/htmlawed/start.php')

diff --git a/mod/htmlawed/start.php b/mod/htmlawed/start.php
index b180be811..52cefa1da 100644
--- a/mod/htmlawed/start.php
+++ b/mod/htmlawed/start.php
@@ -1,7 +1,7 @@
 <?php
 	/**
 	 * Elgg htmLawed tag filtering.
-	 * 
+	 *
 	 * @package ElgghtmLawed
 	 * @author Curverider Ltd
 	 * @author Brett Profitt
@@ -20,14 +20,56 @@
 			// seems to handle about everything we need.
 			'safe' => true,
 			'deny_attribute' => 'class',
-			
-			'schemes' => '*: http,https,ftp,news,mailto,rtsp,teamspeak,gopher,mms,callto;'
-				. 'style: color,cursor,text-align,font-size,font-weight,font-style,border,margin,padding,float'
+			'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);
 	}
-	
+
+	function htmlawed_hook($element, $attribute_array) {
+		$allowed_styles = array(
+			'color', 'cursor', 'text-align', 'font-size', 'font-weight', 'font-style', 'border', 'margin', 'padding', 'float'
+		);
+
+		if (array_key_exists('style', $attribute_array)) {
+			$string = '';
+
+			foreach ($attribute_array as $attr => $value) {
+				if ($attr == 'style') {
+					$styles = explode(';', $value);
+
+					$style_str = '';
+					foreach ($styles as $style) {
+						if (!$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\"";
+				}
+			}
+
+			$string = trim($string);
+			return "<$element $string >";
+		}
+	}
+
 	/**
 	 * htmLawed filtering of tags, called on a plugin hook
 	 *
@@ -38,29 +80,29 @@
 	{
 		$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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