private bool SanitizeStyleRule(ICssRule rule, IElement styleTag, string baseUrl)
{
if (!AllowedAtRules.Contains(rule.Type))
{
return(false);
}
var styleRule = rule as ICssStyleRule;
if (styleRule != null)
{
SanitizeStyleDeclaration(styleTag, styleRule.Style, baseUrl);
}
else
{
var groupingRule = rule as ICssGroupingRule;
if (groupingRule != null)
{
for (int i = 0; i < groupingRule.Rules.Length;)
{
var childRule = groupingRule.Rules[i];
if (!SanitizeStyleRule(childRule, styleTag, baseUrl) && RemoveAtRule(styleTag, childRule))
{
groupingRule.RemoveAt(i);
}
else
{
i++;
}
}
}
else if (rule is ICssPageRule)
{
var pageRule = (ICssPageRule)rule;
SanitizeStyleDeclaration(styleTag, pageRule.Style, baseUrl);
}
else if (rule is ICssKeyframesRule)
{
var keyFramesRule = (ICssKeyframesRule)rule;
foreach (var childRule in keyFramesRule.Rules.OfType <ICssKeyframeRule>().ToList())
{
if (!SanitizeStyleRule(childRule, styleTag, baseUrl) && RemoveAtRule(styleTag, childRule))
{
keyFramesRule.Remove(childRule.KeyText);
}
}
}
else if (rule is ICssKeyframeRule)
{
var keyFrameRule = (ICssKeyframeRule)rule;
SanitizeStyleDeclaration(styleTag, keyFrameRule.Style, baseUrl);
}
}
return(true);
}
public HtmlSanitizer() : base()
{
AllowedTags.Clear();
AllowedTags.Add("p");
AllowedTags.Add("h2");
AllowedTags.Add("strong");
AllowedTags.Add("em");
AllowedTags.Add("ul");
AllowedTags.Add("ol");
AllowedTags.Add("li");
AllowedTags.Add("a");
AllowedTags.Add("br");
AllowedAttributes.Clear();
AllowedAttributes.Add("href");
AllowedCssProperties.Clear();
AllowedAtRules.Clear();
}
internal Md2HtmlSanitizer()
{
AllowedTags.Add(@"meta");
AllowedTags.Add(@"style");
AllowedAttributes.Add(@"content");
AllowedAttributes.Add(@"http-equiv");
AllowedAttributes.Add(@"id");
AllowedAttributes.Add(@"class");
AllowedCssProperties.Add(@"src");
AllowedCssProperties.Add(@"word-break");
AllowedCssProperties.Add(@"word-wrap");
AllowedCssProperties.Add(@"-moz-tab-size");
AllowedCssProperties.Add(@"-o-tab-size");
AllowedCssProperties.Add(@"tab-size");
AllowedCssProperties.Add(@"-webkit-hyphens");
AllowedCssProperties.Add(@"-moz-hyphens");
AllowedCssProperties.Add(@"-ms-hyphens");
AllowedCssProperties.Add(@"hyphens");
AllowedCssProperties.Add(@"background-position-x");
AllowedCssProperties.Add(@"background-position-y");
AllowedCssProperties.Add(@"transition-property");
AllowedCssProperties.Add(@"transition-duration");
AllowedCssProperties.Add(@"transition-timing-function");
AllowedCssProperties.Add(@"transition-delay");
AllowedCssProperties.Add(@"box-shadow");
AllowedSchemes.Add(@"file");
AllowedSchemes.Add(@"data");
AllowedAtRules.Add(CssRuleType.Media);
AllowedAtRules.Add(CssRuleType.Keyframe);
AllowedAtRules.Add(CssRuleType.Keyframes);
RemovingAtRule += ChangedEvent;
RemovingAttribute += ChangedEvent;
RemovingCssClass += ChangedEvent;
RemovingStyle += ChangedEvent;
RemovingTag += ChangedEvent;
}
