private Expression BuildEqualityFilter(EqualityMatchFilter filter, Expression itemExpression)
{
if (filter.AttributeDesc == "cn")
{
Expression left = Expression.Property(itemExpression, "Dn");
string baseObj = (_searchEvent.SearchRequest.BaseObject == "") ? "" : "," + _searchEvent.SearchRequest.BaseObject;
Expression right = Expression.Constant("cn=" + filter.AssertionValue + baseObj);
return(Expression.Equal(left, right));
}
else
{
Expression attributeExpr = Expression.Property(itemExpression, "Attributes");
// Pair to search for
ParameterExpression keyValuePair = Expression.Parameter(typeof(KeyValuePair <string, List <string> >), "a");
// (a.Key == attributeName)
Expression subExprLeftAttributeName = Expression.Property(keyValuePair, "Key");
Expression subExprRightAttributeName = Expression.Constant(filter.AttributeDesc.ToLower());
Expression subExprAttributeName = Expression.Equal(subExprLeftAttributeName, subExprRightAttributeName);
// a.Value.Contains(attributeValue)
Expression subExprValue = Expression.Property(keyValuePair, "Value");
Expression subExprContains = Expression.Call(subExprValue, typeof(List <string>).GetMethod("Contains", new Type[] { typeof(string) }), Expression.Constant(filter.AssertionValue));
// ((a.Key == attributeName) && a.Value.Contains(attributeValue))
Expression attributeExprMatch = Expression.And(subExprAttributeName, subExprContains);
// {a => ((a.Key == attributeName) And a.Value.Contains(attributeValue))}
var lambda = Expression.Lambda <Func <KeyValuePair <string, List <string> >, bool> >(attributeExprMatch, keyValuePair);
MethodInfo anyMethod = typeof(Enumerable).GetMethods(System.Reflection.BindingFlags.Static | System.Reflection.BindingFlags.Public).First(m => m.Name == "Any" && m.GetParameters().Count() == 2).MakeGenericMethod(typeof(KeyValuePair <string, List <string> >));
return(Expression.Call(anyMethod, attributeExpr, lambda));
}
}
private Expression BuildEqualityFilter(EqualityMatchFilter filter, Expression itemExpression)
{
if (filter.AttributeDesc == "cn")
{
Expression left = GetMemberExpressionForAttribute(itemExpression, MemberExpressionAttributes.CN);
Expression right = Expression.Constant(filter.AssertionValue.ToUpper());
return(Expression.Equal(left, right));
}
else if (filter.AttributeDesc == "email")
{
Expression left = GetMemberExpressionForAttribute(itemExpression, MemberExpressionAttributes.Email);
Expression right = Expression.Constant(filter.AssertionValue.ToUpper());
return(Expression.Equal(left, right));
}
else if (filter.AttributeDesc == "displayname")
{
Expression left = GetMemberExpressionForAttribute(itemExpression, MemberExpressionAttributes.DisplayName);
Expression right = Expression.Constant(filter.AssertionValue.ToUpper());
return(Expression.Equal(left, right));
}
else if (filter.AttributeDesc == "entryuuid")
{
Expression left = GetMemberExpressionForAttribute(itemExpression, MemberExpressionAttributes.EntryUUID);
Expression right = Expression.Constant(new Guid(filter.AssertionValue));
return(Expression.Equal(left, right));
}
else if (filter.AttributeDesc == "objectclass")
{
if (filter.AssertionValue == "inetOrgPerson")
{
return(GetAlwaysTrueExpression());
}
else
{
return(GetAlwaysFalseExpression());
}
}
else if (filter.AttributeDesc == "dn")
{
return(GetAlwaysFalseExpression());
}
return(GetAlwaysFalseExpression());
}
