Skip to main content

Modifying your EWS WSDL Proxy Code for Modern Authentication

This is a follow-on from my last post on Modifying your EWS Managed API code to use Hybrid Modern Authentication against OnPrem Mailboxes . If instead of the EWS Managed API you are using EWS Proxy Code (generated from the EWS WSDL) and you want to migrate it to using Modern Authentication for Office365 and/or Hybrid here's a method you can use using the MSAL Authentication library.

Unlike the EWS Managed API the WSDL generated proxy classes and specifically the ExchangeServiceBinding class doesn't have any provision to use Token Credentials. One way of implementing this in .NET is to take advantage of  Polymorphism and create a new class that is derived from the ExchangeServiceBinding class and then override the method GetWebResponse from this class (which is actually derived from the SoapHttpClientProtocol class which contains the actual method we are going to override https://docs.microsoft.com/en-us/dotnet/api/system.web.services.protocols.soaphttpclientprotocol.getwebrequest?view=netframework-4.8 )

At the same time we can also add the X-AnchorMailbox header into the request which is also recommended for any Exchange Online requests you make. And because this method is called before every EWS Request we can place our Token Refresh code in there. In this example I'm using which uses the MSAL all you need to include is code that fetches the token from the TokenCache, this will trigger a Token Refresh if need or ultimately throw to Interaction if the Refresh Token isn't available. So here is a basic C# Console App that can do Hybrid/Modern Auth discover using the MSAL library. If you want the project files you can download them from here



 
Labels:

Popular posts from this blog

Exporting and Uploading Mailbox Items using Exchange Web Services using the new ExportItems and UploadItems operations in Exchange 2010 SP1

Two new EWS Operations ExportItems and UploadItems where introduced in Exchange 2010 SP1 that allowed you to do a number of useful things that where previously not possible using Exchange Web Services. Any object that Exchange stores is basically a collection of properties for example a message object is a collection of Message properties, Recipient properties and Attachment properties with a few meta properties that describe the underlying storage thrown in. Normally when using EWS you can access these properties in a number of a ways eg one example is using the strongly type objects such as emailmessage that presents the underlying properties in an intuitive way that's easy to use. Another way is using Extended Properties to access the underlying properties directly. However previously in EWS there was no method to access every property of a message hence there is no way to export or import an item and maintain full fidelity of every property on that item (you could export the...
Read more

The MailboxConcurrency limit and using Batching in the Microsoft Graph API

If your getting an error such as Application is over its MailboxConcurrency limit while using the Microsoft Graph API this post may help you understand why. Background   The Mailbox  concurrency limit when your using the Graph API is 4 as per https://docs.microsoft.com/en-us/graph/throttling#outlook-service-limits . This is evaluated for each app ID and mailbox combination so this means you can have different apps running under the same credentials and the poor behavior of one won't cause the other to be throttled. If you compared that to EWS you could have up to 27 concurrent connections but they are shared across all apps on a first come first served basis. Batching Batching in the Graph API is a way of combining multiple requests into a single HTTP request. Batching in the Exchange Mail API's EWS and MAPI has been around for a long time and its common, for email Apps to process large numbers of smaller items for a variety of reasons.  Batching in the Gr...
Read more

Sending a Message in Exchange Online via REST from an Arduino MKR1000

This is part 2 of my MKR1000 article, in this previous post  I looked at sending a Message via EWS using Basic Authentication.  In this Post I'll look at using the new Outlook REST API  which requires using OAuth authentication to get an Access Token. The prerequisites for this sketch are the same as in the other post with the addition of the ArduinoJson library  https://github.com/bblanchon/ArduinoJson  which is used to parse the Authentication Results to extract the Access Token. Also the SSL certificates for the login.windows.net  and outlook.office365.com need to be uploaded to the devices using the wifi101 Firmware updater. To use Token Authentication you need to register an Application in Azure https://msdn.microsoft.com/en-us/office/office365/howto/add-common-consent-manually  with the Mail.Send permission. The application should be a Native Client app that use the Out of Band Callback urn:ietf:wg:oauth:2.0:oob. You ...
Read more
All sample scripts and source code is provided by for illustrative purposes only. All examples are untested in different environments and therefore, I cannot guarantee or imply reliability, serviceability, or function of these programs.

All code contained herein is provided to you "AS IS" without any warranties of any kind. The implied warranties of non-infringement, merchantability and fitness for a particular purpose are expressly disclaimed.