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SharePoint serendipity is the effect by which one accidentally discovers something fortunate, especially while looking for something else entirely. In this case, it is the occassional musings, observations, and Ouija board readings about the phabulously
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Developing Low Trust Provider Hosted Apps with SAML Authentication in SharePoint 2013
Low trust provider hosted apps in a SAML secured SharePoint web application is a scenario that did not work when SharePoint 2013 was released. Things have changed fortunately, so here's a quick run down on what you need to do in order to build these apps on premises. The first thing you need to do...
3 Oct 2014
An Updated ClaimsTokenHelper for SharePoint 2013 High Trust Apps and SAML
When Visual Studio 2013 came out, it introduced a new class and simplified methods for obtaining a ClientContext to use with the Client Side Object Model (CSOM) to access SharePoint 2013 sites. A new SharePointContext class was added to simplify the programming model, but internally it still called the...
30 Sep 2014
Developing and Deploying Multiple SharePoint 2013 Apps to a Single Azure Web Site
Today’s topic is one that came about after I heard some folks kind of unhappy about using Azure web sites as a platform for SharePoint 2013 provider-hosted apps. The unhappiness as was really just about the fact that you only get 10 Azure web sites for free and some folks were thinking that this...
13 Aug 2014
Uploading Large Files to SharePoint 2013 from .NET Using CSOM and REST
This is a topic that seems to come up with some frequency and when I needed to do it recently I could not find a good working sample of doing this from server-side code. The scenario here is imagine you want to upload some very large files to SharePoint via CSOM. You have some code running "somewhere"...
2 Aug 2014
Access Denied Error with App Only Access Token When Reading Profile Info
This is yet another rather strange error that I ran across and couldn't find any info out on the interwebs about it so I though I would document it here. Suppose you have a SharePoint App that needs to access some User Profile information. You will probably use the PeopleManager class and ask for...
25 Jul 2014
Uploading File Attachments to Yammer
Working with attachments to message postings in Yammer has been something that I've had a few questions on over time and just recently had a chance to take a look at it. I decided to blog about it only because there appears to be such paucity of information around folks that have actually done this...
7 Jul 2014
Using Yammer Open Graph in .NET - Part 2
In the first part of this series - http://blogs.technet.com/b/speschka/archive/2014/05/29/using-yammer-open-graph-in-net.aspx - I described how to create a Yammer Open Graph object (OGO). In this posting I'll explain how to create a new post in the newsfeed for the OGO, as well as read all messages...
29 May 2014
Using Yammer Open Graph in .NET - Part 1
I've already written about using the Yammer APIs from a .NET client application here: http://blogs.technet.com/b/speschka/archive/2013/10/05/using-the-yammer-api-in-a-net-client-application.aspx. This post is the next logical step in that journey, which is working with Yammer Open Graph items from...
29 May 2014
Changes To Know About When Your SharePoint STS Token Signing Certificate Expires - the Impact to Your High Trust Applications
This is a another follow up to my earlier post on changing the token signing certificate for the SharePoint STS as described here: http://blogs.technet.com/b/speschka/archive/2014/05/06/updating-trust-between-onprem-farms-and-acs-for-apps-when-your-sharepoint-sts-token-signing-certificate-expires.aspx...
12 May 2014
Missing Context Token in Low Trust App with SharePoint 2013 - Part 2
As I noted in my first post on this topic - http://blogs.technet.com/b/speschka/archive/2013/05/28/missing-context-token-in-low-trust-app-with-sharepoint-2013.aspx - you may find yourself in a low trust app without a context token, which basically leaves you up the creek without a paddle. I ran across...
8 May 2014
Create a List in the Host Web When Your SharePoint App is Installed...and Remove it from the Recent Stuff List
This is one of those questions that I've seen asked a lot but for some reason I've never really seen anyone post an answer to it. I did a quick Bing search before writing this post but didn't really see anything up there so I'm going to go out on a bit of a limb and guess that maybe there's...
7 May 2014
Updating Trust Between OnPrem Farms and ACS for Apps When Your SharePoint STS Token Signing Certificate Expires
For those of you who are "in the app way" with SharePoint 2013 (no, not a lot different from being "in the pregnant way", as they say), you'll reach that point sooner or later where the token signing certificate for your SharePoint STS expires if you are using low trust apps on...
6 May 2014
Claim Type Exceptions with Custom Claims Providers in SharePoint 2013
This issue applies to SharePoint 2010 as well but...suppose you have created a custom claims provider and one of the things you want to do is to have some custom claim types that you use. What I mean by custom claim types is just that they are not one of the standard out of the box types like email,...
16 Apr 2014
Enhancing the Yammer Search Results and Messages Samples and Deserialization
Just as kind of strange coincidence, I was in working on some Yammer message JSON goo and realized that there were actually a couple of other important data elements that comes down in the JSON payload when you get a collection of messages from REST. That includes both querying for messages directly...
12 Mar 2014
Programmatically Adding A Trusted Identity Token Issuer to a Web Application Zone in SharePoint 2010 and 2013
Seems like I haven't had a chance to write a good SharePoint / SAML claims kind of article in a while. I was happily plugging away on some code this weekend for a scenario I haven't done before so I thought I would go ahead and post it here for the search engines. The whole topic in general has...
28 Feb 2014
Using Impersonation with the Yammer APIs
One of the things that isn't particularly well known about the Yammer APIs is that its OAuth infrastructure does support a form of impersonation (at least that's how I describe it). This can be extraordinarily useful when you need to access data on behalf of another user and do so within the...
18 Feb 2014
Some More Advice When Using the Yammer APIs with .NET
I wrote this post a little while back here: http://blogs.technet.com/b/speschka/archive/2013/10/05/using-the-yammer-api-in-a-net-client-application.aspx , and I think I'm going to have to fall on the sword just a bit because I have some code in there that I think has people kind of turned sideways...
7 Feb 2014
Your First SharePoint 2013 and Visual Studio 2012 Development Tip - the Old 32-Bit Process Error
Here's your first development tip as you start cranking out SharePoint 2013 solutions using Visual Studio 2012. An old an really annoying problem in Visual Studio 2010 when building SharePoint apps is that it defaulted to creating x86 applications. The problem from a SharePoint perspective is that it...
24 Jul 2012
Configuring a Custom Claims Provider to be Used only on Select Zones in SharePoint 2010
UPDATE: I updated the application attachment for this posting. Before it would only let you toggle a claims provider for a zone if that zone was using SAML claims. In retrospect that limitation didn't make a lot of sense, so now it lets you toggle a claims provider for any zone that is using any type...
3 Jun 2010
Using the Developer Dashboard in SharePoint 2010
The developer dashboard is a new feature in SharePoint 2010 that is design to provide additional performance and tracing information that can be used to debug and troubleshoot issues with page rendering time. The dashboard is turned off by default, but can be enabled via the object model or stsadm (and...
28 Oct 2009
Writing A SharePoint 2010 People Picker Control for Silverlight
One of the sorely missing pieces in the Silverlight toolbox for SharePoint developers is a people picker control. There is a control that SharePoint provides, which you can use in a web part or custom layouts page (the PeopleEditor class). Silverlight code though all executes on the client side, so there...
10 Aug 2011
How To Get All Claims Providers Associated with a Web Application in SharePoint 2010
I’ve been asked this question a couple times before, which is I want to be able to programmatically find out what claims providers are being used with my web application. This question is usually asked to mean what SPTrustedIdentityTokenIssuers are being used, but the method I’ll demonstrate...
27 Mar 2011
Replacing the out of box Name Resolution in SharePoint 2010 - Part 2
A while ago I posted an entry on how to configure your custom claims provider to replace the out of the box claims provider ( http://blogs.technet.com/speschka/archive/2010/04/28/how-to-override-the-default-name-resolution-and-claims-provider-in- sharepoint -2010.aspx ). I wanted / need to follow up...
25 May 2010
Calling a Claims-Aware WCF Service From a SharePoint 2010 Claims Site
I’ve been doing some work lately (that will be fodder for future posts) on more of the end-to-end integration story with SharePoint and other applications, and using claims authentication to flow identity across application boundaries. One of the specific points I’ve been working on lately...
8 Sep 2010
Finally A USEFUL Way to Federate With Windows Live and SharePoint 2010 Using OAuth and SAML
Lots of folks have talked to me in the past about federating SharePoint with Windows Live. On the surface it seems like a pretty good idea – Windows Live has millions of users, everyone logs in with their email address, which is something we use a lot as an identity claim, it’s a big scalable...
1 Mar 2012
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