Dictionary <string, PolicyHtmlAttribute> ParseHtmlAttributes(XElement e)
{
IEnumerable <XElement> elements = e.Elements("attribute");
if (elements == null)
{
return(null);
}
Dictionary <string, PolicyHtmlAttribute> attrs = new Dictionary <string, PolicyHtmlAttribute>();
Func <string, PolicyHtmlAttributeOnInvalid> ParseOnInvalid = s => { PolicyHtmlAttributeOnInvalid tmp; return(s != null && Enum.TryParse <PolicyHtmlAttributeOnInvalid>(s, out tmp) ? tmp : PolicyHtmlAttributeOnInvalid.RemoveAttribute); };
foreach (var node in elements)
{
String name = Attr(node, "name");
if (string.IsNullOrWhiteSpace(name))
{
continue;
}
PolicyHtmlAttribute attr = new PolicyHtmlAttribute(this, name);
attr.OnInvalid = ParseOnInvalid(Attr(node, "onInvalid"));
attr.Description = Attr(node, "description");
attr.AllowedRegExp = GetRegexList(node);
attr.AllowedValues = GetLiteralList(node);
string key = attr.Name.ToLower();
if (!attrs.ContainsKey(key))
{
attrs.Add(key, attr);
}
}
return(attrs);
}
void MergerRules(PolicyHtmlAttribute a, string[] AllowedRegExp, string[] AllowedValues)
{
if (a == null)
{
return;
}
if (AllowedRegExp != null)
{
if (a.AllowedRegExp == null)
{
a.AllowedRegExp = AllowedRegExp;
}
else
{
a.AllowedRegExp = MergerArray(a.AllowedRegExp, AllowedRegExp);
}
}
if (AllowedValues != null)
{
if (a.AllowedValues == null)
{
a.AllowedValues = AllowedValues;
}
else
{
a.AllowedValues = MergerArray(a.AllowedValues, AllowedValues);
}
}
}
public PolicyHtmlAttribute AllowedAttribute(string name)
{
PolicyHtmlAttribute a = allowedAttributes.ContainsKey(name) ? allowedAttributes[name] : null, g = Policy.GlobalHtmlAttribute(name), c = Policy.CommonHtmlAttribute(name);
if (a == null)
{
a = g;
}
else if (g != null)
{
MergerRules(a, g.AllowedRegExp, g.AllowedValues);
}
if (a != null && c != null)
{
MergerRules(a, c.AllowedRegExp, c.AllowedValues);
}
return(a);
}
