PackageController.cs source code in C# .NET

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Code:

                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / TrustUi / MS / Internal / documents / Application / PackageController.cs / 1 / PackageController.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved. 
//
//  
// Responsible for the lifecycle of the PackageDocument and the actions that can
// be performed on it. 
//  
//
// History: 
//  08/28/2005: [....]: Initial implementation.
//-----------------------------------------------------------------------------

using System; 
using System.IO.Packaging;
using System.Security; 
using System.Windows.TrustUI; 
using System.Windows.Xps.Packaging;
 
namespace MS.Internal.Documents.Application
{
/// 
/// Responsible for the lifecycle of the PackageDocument and the actions that can 
/// be performed on it.
///  
///  
internal class PackageController : IDocumentController
{ 
    #region IDocumentController Members
    //-------------------------------------------------------------------------
    // IDocumentController Members
    //------------------------------------------------------------------------- 

    ///  
    ///  
    /// 
    ///  
    /// Critical:
    ///  - we are calling the ctor for TransactionalPackage
    /// TreatAsSafe:
    ///  - safe by definition we are the one method responsibile for setting 
    ///    this value
    ///  - the stream is the Workspace stream which is created based on the 
    ///    source stream 
    /// 
    [SecurityCritical, SecurityTreatAsSafe] 
    bool IDocumentController.EnableEdit(Document document)
    {
        PackageDocument doc = (PackageDocument)document;
 
        if (doc.Workspace != null)
        { 
            doc.Package.EnableEditMode(doc.Workspace); 
        }
 
        return true;
    }

    ///  
    /// 
    ///  
    ///  
    /// Critical:
    ///  - we are calling the ctor for TransactionalPackage 
    ///  - sets Package
    ///  - creates DigitalSignatureProvider
    ///  - creates DocumentSignatureManager
    /// TreatAsSafe: 
    ///  - safe by definition we are the one method responsible for setting
    ///    this value 
    ///  - the stream is the source stream for this XpsDocument 
    ///  - source of package is our underlying stream which is protected
    ///  - provider passed to DocumentSignatureManager is created in this 
    ///    method from a package created from the underlying stream
    /// 
    [SecurityCritical, SecurityTreatAsSafe]
    bool IDocumentController.Open(Document document) 
    {
        PackageDocument doc = (PackageDocument)document; 
 
        TransactionalPackage package = new RestrictedTransactionalPackage(
            doc.Source); 

        doc.Package = package;

        DocumentProperties.Current.SetXpsProperties(package.PackageProperties); 

        DocumentSignatureManager.Initialize(new DigitalSignatureProvider(package)); 
 
        // when signatures change (are added or removed) we can no longer simply copy bits on disk
        DocumentSignatureManager.Current.SignaturesChanged += 
            new EventHandler(
                delegate (
                    object sender,
                    EventArgs args) 
                    {
                        if (doc.IsFileCopySafe) 
                        { 
                            Trace.SafeWrite(
                                Trace.Signatures, 
                                "Disabling file copy for current document.");
                            doc.IsFileCopySafe = false;
                        }
                    }); 

        return true; 
    } 

    ///  
    /// 
    /// 
    /// 
    /// Critical: 
    ///  - we are calling the Rebind for TransactionalPackage
    /// TreatAsSafe: 
    ///  - safe by definition we are the one method responsibile for setting 
    ///    this value
    ///  - the stream is the source stream for this XpsDocument 
    ///  - source of package is our underlying stream which is protected
    /// 
    [SecurityCritical, SecurityTreatAsSafe]
    bool IDocumentController.Rebind(Document document) 
    {
        PackageDocument doc = (PackageDocument)document; 
 
        if (doc.IsRebindNeeded)
        { 
            doc.Package.Rebind(doc.Source);

            // no rebinds are needed above us for documents as package
            doc.IsRebindNeeded = false; 
        }
 
        return true; 
    }
 
    /// 
    /// 
    /// 
    bool IDocumentController.SaveAsPreperation(Document document) 
    {
        return ((IDocumentController)this).SavePreperation(document); 
    } 

    ///  
    /// 
    /// 
    /// 
    ///  
    /// Critical:
    ///  - we are calling the MergeChanges for TransactionalPackage 
    /// TreatAsSafe: 
    ///  - safe by definition we are the one method responsibile for calling
    ///    this member 
    ///  - the stream is the destination stream for this XpsDocument
    /// 
    [SecurityCritical, SecurityTreatAsSafe]
    bool IDocumentController.SaveCommit(Document document) 
    {
        PackageDocument doc = (PackageDocument)document; 
 
        if (doc.Destination == null)
        { 
            return false;
        }

        if (doc.Package.IsDirty || !doc.IsDestinationIdenticalToSource) 
        {
            StreamProxy source = doc.Source as StreamProxy; 
            StreamProxy destination = doc.Destination as StreamProxy; 

            // this will catch the case where our source stream is our destination 
            // stream, which would cause corruption of the package
            if (source.GetHashCode() == destination.GetHashCode())
            {
                throw new InvalidOperationException( 
                    SR.Get(SRID.PackageControllerStreamCorruption));
            } 
 
            // this will catch the case where no one was able to copy the stream
            // thus the lengths will not match 
            if (doc.Source.Length != doc.Destination.Length)
            {
                throw new InvalidOperationException(
                    SR.Get(SRID.PackageControllerStreamCorruption)); 
            }
 
            // Flush the package to ensure that the relationship parts are 
            // written out before changes are merged
            doc.Package.Flush(); 

            doc.Package.MergeChanges(doc.Destination);
            Trace.SafeWrite(Trace.File, "Destination Merged.");
        } 
        else
        { 
            Trace.SafeWrite(Trace.File, "Destination Merge Skipped (nothing to do)."); 
        }
        return true; 
    }

    /// 
    ///  
    /// 
    ///  
    /// This method severely breaks encapsulating the chain, however it does 
    /// so because the requirement breaks encapsulation and the original design
    /// of the class only consider streams not properties.  The requirement is 
    /// that as we transition to/from a protected document we copy properties
    /// between the layers.  It was least risk to compromise the design here
    /// then extend it.
    ///  
    /// 
    /// Critical: 
    ///  - we construct UmcSuppressedProperties 
    ///  - we call DocumentProperties.Copy
    /// TreatAsSafe: 
    ///  - EncryptedPackage (which require RightsManagementPermission) is the
    ///    only type for the UmcSuppressProperties ctor; this is safe because this
    ///    is the correct source for the data
    ///  - copy is safe; it's only critical because of the data we are passing 
    /// 
    [SecurityCritical, SecurityTreatAsSafe] 
    bool IDocumentController.SavePreperation(Document document) 
    {
        // we don't have to check packageDoc for because we are only responsible 
        // for PackageDocuments
        PackageDocument packageDoc = (PackageDocument)document;
        RightsDocument rightsDoc = document.Dependency as RightsDocument;
 
        if (rightsDoc != null)
        { 
            bool isDestinationProtected = rightsDoc.IsDestinationProtected(); 
            bool isSourceProtected = rightsDoc.IsSourceProtected();
 
            // the only time we don't need to copy properties is when
            // neither source nor destination is protected as OPC properties
            // are copied as parts
 
            // if the source was protected and the destination is not
            // then we need to copy properties to the package 
            if (isSourceProtected && !isDestinationProtected) 
            {
                DocumentProperties.Copy( 
                    new SuppressedProperties(rightsDoc.SourcePackage),
                    packageDoc.Package.PackageProperties);
            }
 
            // if the source was not protected and the destination is
            // then we need to copy properties from the package to the envelope 
            if (!isSourceProtected && isDestinationProtected) 
            {
                DocumentProperties.Copy( 
                    packageDoc.Package.PackageProperties,
                    new SuppressedProperties(rightsDoc.DestinationPackage));
            }
 
            // if they were both protected we need to copy properties
            // from the old envelope to the new 
            if (isDestinationProtected && isSourceProtected) 
            {
                DocumentProperties.Copy( 
                    new SuppressedProperties(rightsDoc.SourcePackage),
                    new SuppressedProperties(rightsDoc.DestinationPackage));
            }
        } 
        return true;
    } 
 
    #endregion IDocumentController Members
 
    #region IChainOfResponsibiltyNode Members
    //--------------------------------------------------------------------------
    // IChainOfResponsibiltyNode Members
    //------------------------------------------------------------------------- 

    ///  
    ///  
    /// 
    bool IChainOfResponsibiltyNode.IsResponsible(Document subject) 
    {
        return subject is PackageDocument;
    }
 
    #endregion IChainOfResponsibiltyNode Members
} 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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