Posts - page 7

Recent posts

Controlled access for Azure Mobile Apps for ASP.NET Core

November 10, 2021  5 minute read  

In the last two articles, I’ve gone over how you can create a basic datasync service and add authentication to the service. What if you want to do something more complex? Authorization that is an on/off switch is reasonable as a first pass, but rarely allows you to handle the cases you actually need to implement. Introducing the Access Control Provider To handle cases where your needs are a little more complex, we’ve introduced a new interface: IAccessControlProvider<T>. This requi...

Add authentication to Azure Mobile Apps for ASP.NET Core

November 09, 2021  3 minute read  

In my last article, I introduced the new ASP.NET Core edition of Azure Mobile Apps, including how to set up Entity Framework Core and in-memory stores. Today, we are going to introduce simple authentication. What do you need to do to secure your entire API? We’ll cover more complex authentication schemes (such as protecting a single API, or doing DTO transforms based on the identity of the user) next time. Azure App Service Authentication Azure App Service includes a feature that most pe...

Introducing Azure Mobile Apps for ASP.NET 6

November 08, 2021  8 minute read  

It’s release day for .NET 6, and I couldn’t be happier to introduce Azure Mobile Apps for ASP.NET 6 being released on the same day. When I started developing the new code-base, I had several aims: Backwards compatibility with the older clients. Develop for ASP.NET 6 so I can develop anywhere - Windows, Mac, or Linux. Actually run anywhere - containers, App Service, or even a VM. Bring your own authentication provider and database provider. That meant some radical changes in the w...

Adding an API Key to Azure Mobile Apps with API Management

June 29, 2021  3 minute read  

I’ve written in the past that API keys are not security. They do not authenticate the app or user and they are easily interceptable (or extracted from distributed mobile apps). Despite that, that are good for a bunch of things, including figuring out which version of the app is being run, and ensuring that a certain version of the app you are running is using a specific backend or a specific set of policies. API keys are useful. I’m continually asked to support API keys. They are super-s...

Service Routing for Azure Mobile Apps with API Management

June 15, 2021  6 minute read  

Todays topic is “how do I upgrade the service backend to support the new ASP.NET Core service without affecting my current customers?” Let’s assume, for a moment, that I have already created an API Management service, and added caching to my API. Finally, I’ve adjusted the client application so everything is routing through the API Management service instead of direct to the backend. Azure Mobile Apps uses a header to indicate the version of the protocol that is in use. This head (ZUMO-AP...

Enabling caching for Azure Mobile Apps with API Management

June 11, 2021  7 minute read  

In my last article I introduced API Management and showed how it can be used to provide a front door to the REST API that is exposed by Azure Mobile Apps. What I implemented was a simple pass-through. It didn’t support authentication, and if a link was returned (for example, the “next-page” link in a query result),it pointed right back at the original source. It wasn’t much of an improvement. I’m going to change that today with a couple of improvements: Caching of read-only results. ...

Using API Management with Azure Mobile Apps

June 08, 2021  6 minute read  

Over the years, I’ve been asked for several features within Azure Mobile Apps that I’ve been reluctant to support out of the box. Azure Mobile Apps provides a toolkit in the context of the Node.js and ASP.NET Framework environments, so you can - theoretically - provide a lot of this functionality yourself. You can also use external services to provide that functionality. This is the start of a new series of blogs about Azure Mobile Apps, and my first foray into using Azure API Management t...

Bottom Bar Tabs for your Xamarin Forms app

May 15, 2021  3 minute read  

Following on from last weeks article, I am continuing on my UI journey for my contacts app. My app design calls for a bottom app bar, with three sections - contacts, groups, and profile. The contacts and groups will be lists, and the profile will be a detail page for your own details with an editor. To start, I created the three pages as ContentPage views, complete with XAML layout. For example, here is my ListContactsPage XAML file: <?xml version="1.0" encoding="utf-8" ?> <Cont...

Adding an icon font to your Xamarin Forms apps

May 09, 2021  5 minute read  

I’ve started building a new app using Xamarin Forms from scratch. The idea is that I have a list of contacts stored in the cloud. There isn’t anything revolutionary about that, but I’m going to allow sharing of specific lists with others. You could, for example, create a tag called “Cycling Buddies”, and then tag your friends with that. Everyone who subscribes to the same list gets the same information. Even better, you can “broadcast” your information to certain groups, allowing other p...

Choosing a hosting option for your web app in Azure

March 10, 2021  6 minute read  

Azure, like all the other clouds, has a plethora of mechanisms for getting your web site published. You have Static Web Apps, Azure App Service, Azure Blob Storage, Web Apps for Containers, and then there are the compute ones like virtual machines, and Azure Functions. It can be a little overwhelming. For this analysis, I’m going to assume you want to deploy a stand alone web site - either straight HTML, CSS, and JavaScript or a React, Angular, Vue, or similar app. I’m going to break it d...