private static Uri ParsePartUriAttribute(String attrValue, out ContentType contentType)
{
// extract the query portion - do not ask the Uri class for it because it will escape
// characters and we want to do a simple text comparison later
contentType = ContentType.Empty; // out argument must always be set
int index = attrValue.IndexOf('?');
Uri uri = null;
if (index > 0)
{
try
{
// ensure it starts with the correct query prefix
String query = attrValue.Substring(index);
if ((query.Length > _contentTypeQueryStringPrefix.Length) && (query.StartsWith(_contentTypeQueryStringPrefix, StringComparison.Ordinal)))
{
// truncate the prefix and validate
contentType = new ContentType(query.Substring(_contentTypeQueryStringPrefix.Length));
}
// now construct the uri without the query
uri = PackUriHelper.ValidatePartUri(new Uri(attrValue.Substring(0, index), UriKind.Relative));
}
catch (ArgumentException ae)
{
// Content type or part uri is malformed so we have a bad signature.
// Rethrow as XmlException so outer validation loop can catch it and return validation result.
throw new XmlException(SR.Get(SRID.PartReferenceUriMalformed), ae);
}
}
// throw if we failed
if (contentType.ToString().Length <= 0)
{
throw new XmlException(SR.Get(SRID.PartReferenceUriMalformed));
}
return(uri);
}
/// <summary>
/// Generates a Reference tag that contains a Relationship transform
/// </summary>
/// <param name="manager">manager</param>
/// <param name="relationshipPartName">name of the relationship part</param>
/// <param name="xDoc">current xml document</param>
/// <param name="hashAlgorithm">hash algorithm = digest method</param>
/// <param name="relationshipSelectors">relationshipSelectors that represent the relationships to sign </param>
/// <remarks>ContentType is known and part name can be derived from the relationship collection</remarks>
private static XmlNode GenerateRelationshipSigningReference(
PackageDigitalSignatureManager manager,
XmlDocument xDoc,
HashAlgorithm hashAlgorithm,
Uri relationshipPartName,
IEnumerable <PackageRelationshipSelector> relationshipSelectors)
{
string relPartContentType = PackagingUtilities.RelationshipPartContentType.ToString();
// <Reference>
XmlElement reference = xDoc.CreateElement(XTable.Get(XTable.ID.ReferenceTagName), SignedXml.XmlDsigNamespaceUrl);
// add Uri
// persist the Uri of the associated Relationship part
String relationshipPartString;
if (PackUriHelper.ComparePartUri(relationshipPartName, PackageRelationship.ContainerRelationshipPartName) == 0)
{
relationshipPartString = PackageRelationship.ContainerRelationshipPartName.ToString();
}
else
{
relationshipPartString = PackUriHelper.GetStringForPartUri(relationshipPartName);
}
XmlAttribute uriAttr = xDoc.CreateAttribute(XTable.Get(XTable.ID.UriAttrName));
uriAttr.Value = relationshipPartString + _contentTypeQueryStringPrefix + relPartContentType;
reference.Attributes.Append(uriAttr);
// add transforms tag (always necessary)
// <Transforms>
XmlElement transforms = xDoc.CreateElement(XTable.Get(XTable.ID.TransformsTagName), SignedXml.XmlDsigNamespaceUrl);
// add Relationship transform
String opcNamespace = XTable.Get(XTable.ID.OpcSignatureNamespace);
String opcNamespacePrefix = XTable.Get(XTable.ID.OpcSignatureNamespacePrefix);
XmlElement transform = xDoc.CreateElement(XTable.Get(XTable.ID.TransformTagName), SignedXml.XmlDsigNamespaceUrl);
XmlAttribute algorithmAttr = xDoc.CreateAttribute(XTable.Get(XTable.ID.AlgorithmAttrName));
algorithmAttr.Value = XTable.Get(XTable.ID.RelationshipsTransformName);
transform.Attributes.Append(algorithmAttr);
// <RelationshipReference SourceId="abc" /> or
// <RelationshipGroupReference SourceType="xyz" />
foreach (PackageRelationshipSelector relationshipSelector in relationshipSelectors)
{
switch (relationshipSelector.SelectorType)
{
case PackageRelationshipSelectorType.Id:
{
XmlNode relationshipNode = xDoc.CreateElement(opcNamespacePrefix, XTable.Get(XTable.ID.RelationshipReferenceTagName), opcNamespace);
XmlAttribute idAttr = xDoc.CreateAttribute(XTable.Get(XTable.ID.SourceIdAttrName));
idAttr.Value = relationshipSelector.SelectionCriteria;
relationshipNode.Attributes.Append(idAttr);
transform.AppendChild(relationshipNode);
}
break;
case PackageRelationshipSelectorType.Type:
{
XmlNode relationshipNode = xDoc.CreateElement(opcNamespacePrefix, XTable.Get(XTable.ID.RelationshipsGroupReferenceTagName), opcNamespace);
XmlAttribute typeAttr = xDoc.CreateAttribute(XTable.Get(XTable.ID.SourceTypeAttrName));
typeAttr.Value = relationshipSelector.SelectionCriteria;
relationshipNode.Attributes.Append(typeAttr);
transform.AppendChild(relationshipNode);
}
break;
default:
Invariant.Assert(false, "This option should never be executed");
break;
}
}
transforms.AppendChild(transform);
// add non-Relationship transform (if any)
String transformName = null;
if (manager.TransformMapping.ContainsKey(relPartContentType))
{
transformName = manager.TransformMapping[relPartContentType]; // let them override
//Currently we only support two transforms and so we validate whether its
//one of those
if (transformName == null ||
transformName.Length == 0 ||
!XmlDigitalSignatureProcessor.IsValidXmlCanonicalizationTransform(transformName))
{
throw new InvalidOperationException(SR.Get(SRID.UnsupportedTransformAlgorithm));
}
// <Transform>
transform = xDoc.CreateElement(XTable.Get(XTable.ID.TransformTagName), SignedXml.XmlDsigNamespaceUrl);
algorithmAttr = xDoc.CreateAttribute(XTable.Get(XTable.ID.AlgorithmAttrName));
algorithmAttr.Value = transformName;
transform.Attributes.Append(algorithmAttr);
transforms.AppendChild(transform);
}
reference.AppendChild(transforms);
// <DigestMethod>
reference.AppendChild(GenerateDigestMethod(manager, xDoc));
// <DigestValue> - digest the virtual node list made from these Relationship tags
using (Stream s = XmlDigitalSignatureProcessor.GenerateRelationshipNodeStream(GetRelationships(manager, relationshipSelectors))) // serialized node list
{
reference.AppendChild(GenerateDigestValueNode(xDoc, hashAlgorithm, s, transformName));
}
return(reference);
}
/// <summary>
/// Add new relationship to the Collection
/// </summary>
/// <param name="targetUri">target</param>
/// <param name="targetMode">Enumeration indicating the base uri for the target uri</param>
/// <param name="relationshipType">relationship type that uniquely defines the role of the relationship</param>
/// <param name="id">String that conforms to the xsd:ID datatype. Unique across the source's relationships.
/// Null OK (ID will be generated).</param>
/// <param name="parsing">Indicates whether the add call is made while parsing existing relationships
/// from a relationship part, or we are adding a new relationship</param>
private PackageRelationship Add(Uri targetUri, TargetMode targetMode, string relationshipType, string id, bool parsing)
{
if (targetUri == null)
{
throw new ArgumentNullException("targetUri");
}
if (relationshipType == null)
{
throw new ArgumentNullException("relationshipType");
}
ThrowIfInvalidRelationshipType(relationshipType);
//Verify if the Enum value is valid
if (targetMode < TargetMode.Internal || targetMode > TargetMode.External)
{
throw new ArgumentOutOfRangeException("targetMode");
}
// don't accept absolute Uri's if targetMode is Internal.
if (targetMode == TargetMode.Internal && targetUri.IsAbsoluteUri)
{
throw new ArgumentException(SR.Get(SRID.RelationshipTargetMustBeRelative), "targetUri");
}
// don't allow relationships to relationships
// This check should be made for following cases
// 1. Uri is absolute and it is pack Uri
// 2. Uri is NOT absolute and its target mode is internal (or NOT external)
// Note: if the target is absolute uri and its not a pack scheme then we cannot determine if it is a rels part
// Note: if the target is relative uri and target mode is external, we cannot determine if it is a rels part
if ((!targetUri.IsAbsoluteUri && targetMode != TargetMode.External) ||
(targetUri.IsAbsoluteUri && targetUri.Scheme == PackUriHelper.UriSchemePack))
{
Uri resolvedUri = GetResolvedTargetUri(targetUri, targetMode);
//GetResolvedTargetUri returns a null if the target mode is external and the
//target Uri is a packUri with no "part" component, so in that case we know that
//its not a relationship part.
if (resolvedUri != null)
{
if (PackUriHelper.IsRelationshipPartUri(resolvedUri))
{
throw new ArgumentException(SR.Get(SRID.RelationshipToRelationshipIllegal), "targetUri");
}
}
}
// Generate an ID if id is null. Throw exception if neither null nor a valid unique xsd:ID.
if (id == null)
{
id = GenerateUniqueRelationshipId();
}
else
{
ValidateUniqueRelationshipId(id);
}
//Ensure the relationship part
EnsureRelationshipPart();
// create and add
PackageRelationship relationship = new PackageRelationship(_package, _sourcePart, targetUri, targetMode, relationshipType, id);
_relationships.Add(relationship);
//If we are adding relationships as a part of Parsing the underlying relationship part, we should not set
//the dirty flag to false.
_dirty = !parsing;
return(relationship);
}
//------------------------------------------------------
//
// Constructors
//
//------------------------------------------------------
/// <summary>
/// Build a System.IO.Stream on a part that possibly consists of multiple files
/// An InterleavedZipPartStream gets created by ZipPackagePart.GetStreamCore when the part
/// is interleaved. It wraps one or more Zip streams (one per piece).
/// (pieces).
/// </summary>
/// <param name="mode">Mode (create, etc.) in which piece streams should be opened</param>
/// <param name="access">Access (read, write, etc.) with which piece streams should be opened</param>
/// <param name="owningPart">
/// The part to build a stream on. It contains all ZipFileInfo descriptors for the part's pieces
/// (see ZipPackage.GetPartsCore).
/// </param>
internal InterleavedZipPartStream(ZipPackagePart owningPart, FileMode mode, FileAccess access)
: this(PackUriHelper.GetStringForPartUri(owningPart.Uri),
owningPart.PieceDescriptors,
mode, access)
{
}
/// <summary>
/// rootElement == null: Load elements, validation of root element will occur in caller by checking object type or casting
/// rootElement != null: Only perform validation, and expect rootElement at root of markup
/// </summary>
/// <param name="stream"></param>
/// <param name="parentUri"></param>
/// <param name="pc"></param>
/// <param name="mimeType"></param>
/// <param name="rootElement"></param>
/// <returns></returns>
private object Load(Stream stream, Uri parentUri, ParserContext pc, ContentType mimeType, string rootElement)
{
object obj = null;
if (!DocumentMode)
{ // Loose XAML, just check against schema, don't check content type
if (rootElement == null)
{
obj = XamlReader.Load(stream, pc);
}
}
else
{ // inside an XPS Document. Perform maximum validation
XpsSchema schema = XpsSchema.GetSchema(mimeType);
Uri uri = pc.BaseUri;
// Using PackUriHelper.ValidateAndGetPackUriComponents internal method
// to get Package and Part Uri in one step
Uri packageUri;
Uri partUri;
InternalPackUriHelper.ValidateAndGetPackUriComponents(uri, out packageUri, out partUri);
Package package = PreloadedPackages.GetPackage(packageUri);
Uri parentPackageUri = null;
if (parentUri != null)
{
parentPackageUri = PackUriHelper.GetPackageUri(parentUri);
if (!parentPackageUri.Equals(packageUri))
{
throw new FileFormatException(SR.Get(SRID.XpsValidatingLoaderUriNotInSamePackage));
}
}
schema.ValidateRelationships(new SecurityCriticalData <Package>(package), packageUri, partUri, mimeType);
if (schema.AllowsMultipleReferencesToSameUri(mimeType))
{
_uniqueUriRef = null;
}
else
{
_uniqueUriRef = new Hashtable(11);
}
Hashtable validResources = (_validResources.Count > 0 ? _validResources.Peek() : null);
if (schema.HasRequiredResources(mimeType))
{
validResources = new Hashtable(11);
PackagePart part = package.GetPart(partUri);
PackageRelationshipCollection requiredResources = part.GetRelationshipsByType(_requiredResourceRel);
foreach (PackageRelationship relationShip in requiredResources)
{
Uri targetUri = PackUriHelper.ResolvePartUri(partUri, relationShip.TargetUri);
Uri absTargetUri = PackUriHelper.Create(packageUri, targetUri);
PackagePart targetPart = package.GetPart(targetUri);
if (schema.IsValidRequiredResourceMimeType(targetPart.ValidatedContentType()))
{
if (!validResources.ContainsKey(absTargetUri))
{
validResources.Add(absTargetUri, true);
}
}
else
{
if (!validResources.ContainsKey(absTargetUri))
{
validResources.Add(absTargetUri, false);
}
}
}
}
XpsSchemaValidator xpsSchemaValidator = new XpsSchemaValidator(this, schema, mimeType,
stream, packageUri, partUri);
_validResources.Push(validResources);
if (rootElement != null)
{
xpsSchemaValidator.XmlReader.MoveToContent();
if (!rootElement.Equals(xpsSchemaValidator.XmlReader.Name))
{
throw new FileFormatException(SR.Get(SRID.XpsValidatingLoaderUnsupportedMimeType));
}
while (xpsSchemaValidator.XmlReader.Read())
{
;
}
}
else
{
obj = XamlReader.Load(xpsSchemaValidator.XmlReader,
pc,
XamlParseMode.Synchronous);
}
_validResources.Pop();
}
return(obj);
}
