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//
// XmlDsigEnvelopedSignatureTransform.cs -
// Enveloped Signature Transform implementation for XML Signature
//
// Author:
// Sebastien Pouliot (spouliot@motus.com)
// Atsushi Enomoto (atsushi@ximian.com)
//
// (C) 2002, 2003 Motus Technologies Inc. (http://www.motus.com)
// (C) 2004 Novell Inc.
//
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System.Collections;
using System.IO;
using System.Xml;
namespace System.Security.Cryptography.Xml {
public class XmlDsigEnvelopedSignatureTransform : Transform {
private Type[] input;
private Type[] output;
private bool comments;
private object inputObj;
public XmlDsigEnvelopedSignatureTransform ()
{
Algorithm = "http://www.w3.org/2000/09/xmldsig#enveloped-signature";
comments = false;
}
public XmlDsigEnvelopedSignatureTransform (bool includeComments)
{
comments = includeComments;
}
public override Type[] InputTypes {
get {
if (input == null) {
lock (this) {
// this way the result is cached if called multiple time
input = new Type [3];
input[0] = typeof (System.IO.Stream);
input[1] = typeof (System.Xml.XmlDocument);
input[2] = typeof (System.Xml.XmlNodeList);
}
}
return input;
}
}
public override Type[] OutputTypes {
get {
if (output == null) {
lock (this) {
// this way the result is cached if called multiple time
output = new Type [2];
output [0] = typeof (System.Xml.XmlDocument);
output [1] = typeof (System.Xml.XmlNodeList);
}
}
return output;
}
}
protected override XmlNodeList GetInnerXml ()
{
return null; // THIS IS DOCUMENTED AS SUCH
}
// NOTE: This method never supports the requirements written
// in xmldsig spec that says its input is canonicalized before
// transforming. This method just removes Signature element.
// Canonicalization is done in SignedXml.
public override object GetOutput ()
{
XmlDocument doc = null;
// possible input: Stream, XmlDocument, and XmlNodeList
if (inputObj is Stream) {
doc = new XmlDocument ();
doc.PreserveWhitespace = true;
#if NET_1_1
doc.XmlResolver = GetResolver ();
#endif
doc.Load (new XmlSignatureStreamReader (
new StreamReader (inputObj as Stream)));
return GetOutputFromNode (doc, GetNamespaceManager (doc), true);
}
else if (inputObj is XmlDocument) {
doc = inputObj as XmlDocument;
return GetOutputFromNode (doc, GetNamespaceManager (doc), true);
}
else if (inputObj is XmlNodeList) {
ArrayList al = new ArrayList ();
XmlNodeList nl = (XmlNodeList) inputObj;
if (nl.Count > 0) {
XmlNamespaceManager m = GetNamespaceManager (nl.Item (0));
ArrayList tmp = new ArrayList ();
foreach (XmlNode n in nl)
tmp.Add (n);
foreach (XmlNode n in tmp)
if (n.SelectNodes ("ancestor-or-self::dsig:Signature", m).Count == 0)
al.Add (GetOutputFromNode (n, m, false));
}
return new XmlDsigNodeList (al);
}
// Note that it is unexpected behavior with related to InputTypes (MS.NET accepts XmlElement)
else if (inputObj is XmlElement) {
XmlElement el = inputObj as XmlElement;
XmlNamespaceManager m = GetNamespaceManager (el);
if (el.SelectNodes ("ancestor-or-self::dsig:Signature", m).Count == 0)
return GetOutputFromNode (el, m, true);
}
throw new NullReferenceException ();
}
private XmlNamespaceManager GetNamespaceManager (XmlNode n)
{
XmlDocument doc = ((n is XmlDocument) ? (n as XmlDocument) : n.OwnerDocument);
XmlNamespaceManager nsmgr = new XmlNamespaceManager (doc.NameTable);
nsmgr.AddNamespace ("dsig", XmlSignature.NamespaceURI);
return nsmgr;
}
private XmlNode GetOutputFromNode (XmlNode input, XmlNamespaceManager nsmgr, bool remove)
{
if (remove) {
XmlNodeList nl = input.SelectNodes ("descendant-or-self::dsig:Signature", nsmgr);
ArrayList al = new ArrayList ();
foreach (XmlNode n in nl)
al.Add (n);
foreach (XmlNode n in al)
n.ParentNode.RemoveChild (n);
}
return input;
}
public override object GetOutput (Type type)
{
if (type == Type.GetType ("Stream"))
return GetOutput ();
throw new ArgumentException ("type");
}
public override void LoadInnerXml (XmlNodeList nodeList)
{
// NO CHANGE
}
public override void LoadInput (object obj)
{
inputObj = obj;
}
}
}
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