develop-mobile-apps-with-csharp-and-azure | The Book Contents - Develop Mobile Apps with C # and Azure | Form library

I'm creating a Xamarin.forms mobile app with Azure. I have enabled Authentication/Authorization in Azure to protect the APIs in Backend.

What I need is that to ask user to login with Facebook or Google and get some information of the user such as name, email and... and then save this data in a table as user information. I like to ask user just once for login and get the data and I don't need to keep the token provided by Facebook for example and refresh it always (which I red refreshing is not supported by Facebook), but also need to keep the user logged in and has access securely to Backend APIs. I am new in this and completely confused of using Azure AD, facebook and...

What is the best way to do that? I have followed this tutorial and now am able to login with Facebook.

I am trying to force a logout from an azure server. If you click to logout and then click login, you're not prompted for your username/password it just logs you straight back in.

I am writing a UWP application that connects to an Azure Webserver. If it is relevant you can see that when you Logout it removes the reference from the Windows Credential Manager and restores it as soon as you click you Login.

My questions is essentially, what else do I need to remove to stop the app retrieving the previous credentials instead of prompting so a new user can sign in?

We are currently writing a Xamarin Forms Azure Mobile application, using client flow, AAD authentication, refresh tokens etc. Most of this is working as expected. However, logging out of the application does not work properly. It completes the logout process for both Android and iOS - but upon redirection to the login screen, hitting sign in will never prompt the user with the Microsoft login as expected, it will sign them straight back into the app.

To add a little bit of background, this app has been implemented as per Adrian Hall's book,

current link: https://adrianhall.github.io/develop-mobile-apps-with-csharp-and-azure/

with the above described options and configurations.

I have also read through the 30 days of Zumo (also by Adrian Hall) blog on this, and every single post I can find on here relating to this.

My current logout code is as follows:

I've gone through instructions In this documentation To implement offline sync on my Xamarin.Forms client But when I pull data using sync table, I don't get the data presently in the cloud, Instead when I Read data using the normal table, I actually receive data normally, I don't understand, Here is my code to get data Using SYncTable :

I have schema as below and I would like to know if I can get all the TaskCategoryMappings by CategoryId when I have to pulll all data. I went through the documentation here but I cant figure out how to do it ? All the examples are like this one based on UserId. but userid is used for also authentication and on the server side I already handle it fine to return only mappings belong to relevant user and i want in adition to filter by CategoryId?

another SO sample is here also using userId Parameter Passing with Azure Get Service

I am playing around with Xamarin.Forms (mvvm) with Prism and have noticed that some tutorials show navigating to another Page while others show navigating to a View.

At a high level, I understand the literal difference... however I do not understand when I should use one over the other? I have an inclination that some of the reasoning is around dependencies, for example:

A Page has the instance of User > navigate to a view = User is still present when the back operation is used... meanwhile if you want this same behavior in navigating to and from a page, you'll need to pass the instance around via parameters... Is this correct/the reasoning behind navigating to and from views instead of pages?

I am trying to get server managed authentication working with Visual Studio Mobile Center. It uses Azure App Service Authentication. I was able to setup my Facebook Developer account to allow login, then configured it on Mobile Center, and when I go to the mobile center link for auth in a web browser, it works great.

I setup the client side of the authentication identically to Adrian Hall's examples in his book: https://adrianhall.github.io/develop-mobile-apps-with-csharp-and-azure/chapter2/social/#adding-authentication-to-a-mobile-client

When the webview pops up for facebook, it lets me enter credentials, but then crashes when I hit the submit button. This is the stack trace from the application output window:

Before I worked with Aws Cognito and it is straightforward how the flow works but I am not able to understand the benefit Azure mobile services authentication. I followed this documentation but it confused me even more. When I use aws with facebook Login.

• user logs in. I fetch the token and user information I pass this token to AWS cognito.

• Cognito stores it for me and every time I come back to the app, I ask Cognito "hey cognito is my token still alive". Cognito verifies with facbeook. if yes continue, no ask user for authentication again. as described over here

  I expect similar behavior with Azure, is it not happening? why in the link tells me that I need to deal with IsExpired myself by extracting token pattern?

And Other question, Azure is using also federated Identities If I understand, on Cognito I can see the users. where are they stored in azure, can I see them somehow or I need to store myself?

I am using xamarin facebook sdk for iOS in a xamarin project with shared code and forms UI along with Azure Mobile app backend. I am trying to do client flow login using this sdk but am not able to. The app crashes on device as soon as its launched. However, when using the similar approach on android side (using xamarin facebook sdk for android) everything works superb. My code is based on what Adrian Hall has suggested in his book. It works fine in simulator and opens up the web view for login but fails on device. Following is the code in iOS project: