//------------------------------------------------------
//
// Private Methods
//
//------------------------------------------------------
/// <summary>
/// GenerateRelationshipSigningReferences
/// </summary>
/// <param name="manager"></param>
/// <param name="xDoc"></param>
/// <param name="hashAlgorithm"></param>
/// <param name="relationshipSelectors"></param>
/// <param name="manifest"></param>
/// <returns>number of references to be signed</returns>
private static int GenerateRelationshipSigningReferences(
PackageDigitalSignatureManager manager,
XmlDocument xDoc, HashAlgorithm hashAlgorithm,
IEnumerable <PackageRelationshipSelector> relationshipSelectors,
XmlNode manifest)
{
// PartUri - and its list of PackageRelationshipSelectors
Dictionary <Uri, List <PackageRelationshipSelector> > partAndSelectorDictionary
= new Dictionary <Uri, List <PackageRelationshipSelector> >();
foreach (PackageRelationshipSelector relationshipSelector in relationshipSelectors)
{
//update the partAndSelectorDictionary for each relationshipSelector
Uri relationshipPartUri = PackUriHelper.GetRelationshipPartUri(relationshipSelector.SourceUri);
List <PackageRelationshipSelector> selectors;
if (partAndSelectorDictionary.ContainsKey(relationshipPartUri))
{
selectors = partAndSelectorDictionary[relationshipPartUri];
}
else
{
selectors = new List <PackageRelationshipSelector>();
partAndSelectorDictionary.Add(relationshipPartUri, selectors);
}
selectors.Add(relationshipSelector);
}
// now that we have them grouped by Part name, emit the XML
// Here is an optimization for saving space by declaring the OPC namespace and prefix
// in the <Manifest> tag. It will become:
// <Manifest xmlns:opc="http://schemas.openxmlformats.org/package/2006/digital-signature">
// Later when we generate the RelationshipSigningReference we can use the namespace prefix "opc"
// instead of the long namespace itself, thus saving some space if the manifest has more than one
// RelationshipSigningReference.
//
XmlElement xmlE = (XmlElement)manifest;
xmlE.SetAttribute(XTable.Get(XTable.ID.OpcSignatureNamespaceAttribute),
XTable.Get(XTable.ID.OpcSignatureNamespace));
int count = 0;
foreach (Uri partName in partAndSelectorDictionary.Keys)
{
// emit xml and append
manifest.AppendChild(
GenerateRelationshipSigningReference(manager, xDoc, hashAlgorithm,
partName, /* we are guaranteed that this is a valid part Uri, so we do not use PackUriHelper.CreatePartUri */
partAndSelectorDictionary[partName]));
count++;
}
return(count);
}
/// <summary>
/// Returns the associated RelationshipPart for this part
/// </summary>
/// <param name="part">may be null</param>
/// <returns>name of relationship part for the given part</returns>
private static Uri GetRelationshipPartUri(PackagePart part)
{
Uri sourceUri;
if (part == null)
{
sourceUri = PackUriHelper.PackageRootUri;
}
else
{
sourceUri = part.Uri;
}
return(PackUriHelper.GetRelationshipPartUri(sourceUri));
}