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Microsoft Information Protection SDK - File SDK Republishing Quickstart (C#)

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Overview

For an overview on this scenario and where it may be used, refer to Republishing in MIP SDK.

Prerequisites

If you haven't already, be sure to complete the following prerequisites before continuing:

  • Complete Quickstart: Set/get sensitivity labels(C#) first, which builds a starter Visual Studio solution, to list an organization's sensitivity labels, to set and read sensitivity labels to/from a file. This "How to - Republish a protected file - C#" Quickstart builds on the previous one.
  • Optionally: Review File handlers in the MIP SDK concepts.
  • Optionally: Review Protection handlers in the MIP SDK concepts.

Add logic to edit and republish a protected file

  1. Open the Visual Studio solution you created in the previous "Quickstart: Set/get sensitivity labels(C#)" article.

  2. Using Solution Explorer, open the .cs file in your project that contains the implementation of the Main() method. It defaults to the same name as the project containing it, which you specified during project creation.

  3. Toward the end of the Main() body, below Console.ReadKey() and above application shutdown block (where you left off in the previous Quickstart), insert the following code.

string protectedFilePath = "<protected-file-path>" // Originally protected file's path from previous quickstart.

//Create a fileHandler for consumption for the Protected File.
var protectedFileHandler = Task.Run(async () => 
                            await fileEngine.CreateFileHandlerAsync(protectedFilePath,// inputFilePath
                                                                    protectedFilePath,// actualFilePath
                                                                    false, //isAuditDiscoveryEnabled
                                                                    null)).Result; // fileExecutionState

// Store protection handler from file
var protectionHandler = protectedFileHandler.Protection;

//Check if the user has the 'Edit' right to the file
if (protectionHandler.AccessCheck("Edit"))
{
    // Decrypt file to temp path
    var tempPath = Task.Run(async () => await protectedFileHandler.GetDecryptedTemporaryFileAsync()).Result;

    /*
        Your own application code to edit the decrypted file belongs here. 
    */

    /// Follow steps below for re-protecting the edited file. ///
    // Create a new file handler using the temporary file path.
    var republishHandler = Task.Run(async () => await fileEngine.CreateFileHandlerAsync(tempPath, tempPath, false)).Result;

    // Set protection using the ProtectionHandler from the original consumption operation.
    republishHandler.SetProtection(protectionHandler);

    // New file path to save the edited file
    string reprotectedFilePath = "<reprotected-file-path>" // New file path for saving reprotected file.

    // Write changes
    var reprotectedResult = Task.Run(async () => await republishHandler.CommitAsync(reprotectedFilePath)).Result;

    var protectedLabel = protectedFileHandler.Label;
    Console.WriteLine(string.Format("Originally protected file: {0}", protectedFilePath));
    Console.WriteLine(string.Format("File LabelID: {0} \r\nProtectionOwner: {1} \r\nIsProtected: {2}", 
                        protectedLabel.Label.Id, 
                        protectedFileHandler.Protection.Owner, 
                        protectedLabel.IsProtectionAppliedFromLabel.ToString()));
    var reprotectedLabel = republishHandler.Label;
    Console.WriteLine(string.Format("Reprotected file: {0}", reprotectedFilePath));
    Console.WriteLine(string.Format("File LabelID: {0} \r\nProtectionOwner: {1} \r\nIsProtected: {2}", 
                        reprotectedLabel.Label.Id, 
                        republishHandler.Protection.Owner, 
                        reprotectedLabel.IsProtectionAppliedFromLabel.ToString()));
    Console.WriteLine("Press a key to continue.");
    Console.ReadKey();
}

  1. Towards the end of Main() find the application shutdown block created in previous quickstart and add below handler lines to release resources.

        protectedFileHandler = null;
    protectionHandler = null;

  2. Replace the placeholder values in the source code using the following values:

    Placeholder Value
    <protected-file-path> Protected file from previous quickstart.
    <reprotected-file-path> The output file path for modified file to republish.

Build and test the application

Build and test your client application.

  1. Use CTRL-SHIFT-B (Build Solution) to build your client application. If you have no build errors, use F5 (Start debugging) to run your application.

  2. If your project builds and runs successfully, the application may prompt for authentication using Microsoft Authentication Library (MSAL) each time the SDK calls your AcquireToken() method. If cached credentials already exist, you won't be prompted to sign in and see the list of labels, followed by the information on the applied label and modified file.

  Personal : 73c47c6a-eb00-4a6a-8e19-efaada66dee6
  Public : 73254501-3d5b-4426-979a-657881dfcb1e
  General : da480625-e536-430a-9a9e-028d16a29c59
  Confidential : 569af77e-61ea-4deb-b7e6-79dc73653959
  Highly Confidential : 905845d6-b548-439c-9ce5-73b2e06be157
  Press a key to continue.

  Getting the label committed to file: C:\Test\Test_protected.docx
  File Label: Confidential
  IsProtected: True
  Press a key to continue.
  Originally protected file: C:\Test\Test_protected.docx
  File LabelID: 569af77e-61ea-4deb-b7e6-79dc73653959
  ProtectionOwner: User1@Contoso.OnMicrosoft.com
  IsProtected: True
  Reprotected file: C:\Test\Test_reprotected.docx
  File LabelID: 569af77e-61ea-4deb-b7e6-79dc73653959
  ProtectionOwner: User1@Contoso.OnMicrosoft.com
  IsProtected: True
  Press a key to continue.