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Azure Function c# - Retrieve list of subscription's WebApp

We want to create an azure function in c# that retrieve the list of azure web app contained in the subscription (basically we want to call dynamically, for each webapp, the same API endpoint changing the subdomain of the api).
It's possible with c# retrieve the list of the web app contained in the same azure function subscriptions?
Usually we connect to the master database, we query the sys.databases to collect the dbname and understand the webapp names. But we are searching for a smartest way.

If you're in C# land, I'd look at using the ArmClient class to retrieve what you're looking for.
Install these (I've got a few others installed but start with that and see how you go, there may be a couple of others needed) Nuget packages ...
Azure.Identity;
Azure.ResourceManager;
Azure.ResourceManager.AppService
... and from there, using the DefaultCredential approach (if you've never used it, read up on it here -> https://github.com/Azure/azure-sdk-for-net/blob/main/sdk/identity/Azure.Identity/README.md) you can query your subscriptions webApps ...
using Azure.Identity;
using Azure.ResourceManager;
using Azure.ResourceManager.AppService;
using System;
using System.Threading.Tasks;
namespace AzureManagement
{
internal class Program
{
static void Main(string[] args)
{
GetAzureResources().Wait();
}
static async Task GetAzureResources()
{
var credential = new DefaultAzureCredential();
var armClient = new ArmClient(credential);
var subscription = await armClient.GetDefaultSubscriptionAsync();
var webSitesEnumerator = subscription.GetWebSitesAsync().GetAsyncEnumerator();
try
{
while (await webSitesEnumerator.MoveNextAsync())
{
var webSite = webSitesEnumerator.Current;
Console.WriteLine($"Web App Name ........ {webSite.Data.Name}");
Console.WriteLine($"Default Host Name ... {webSite.Data.DefaultHostName}\n");
}
}
finally
{
await webSitesEnumerator.DisposeAsync();
}
Console.ReadLine();
}
}
}
The above is obviously not a function app but the core code will still work for you and can be ported as need be.
Note: I could be telling you how to suck eggs, but, once deployed to Azure, you'll need to do the necessary work to ensure that the function app has the required access to retrieve all of the resource information you're looking for.
If you're unfamiliar with that, read up on the managed identity concept. It's very easy to setup -> https://learn.microsoft.com/en-us/azure/app-service/overview-managed-identity

Yes, one easy way is to use HttpClient and send a request to Azure Rest API:
GET https://management.azure.com/subscriptions/{subscriptionId}/providers/Microsoft.Web/sites?api-version=2022-03-01
https://learn.microsoft.com/en-us/rest/api/appservice/web-apps/list
PS: you first need to acquire an authentication token.
https://www.youtube.com/watch?v=6b1J03fDnOg&t=329s

Xamarin.forms cannot convert from object to system.type with Xamarin.Auth and specific android platform

I'm implementing authentication in a Xamarin.Forms app. I was looking at this sample " TodoAWSAuth - Configuring Google as an OAuth identity provider". In my implementation of OAuthLoginPresenter specific for android I have this code:
using Xamarin.Auth;
namespace InstagramApp.Droid
{
public class OAuthLoginPresenter
{
public void Login(Authenticator authenticator)
{
Xamarin.Forms.Forms.Context.StartActivity(authenticator.GetUI(Xamarin.Forms.Forms.Context));
}
}
}
My:
Xamarin.Forms.Forms.Context.StartActivity(authenticator.GetUI(Xamarin.Forms.Forms.Context));
returns me:
Argument 1: cannot convert from 'object' to 'System.Type'
It is the same of the sample in the link. What could be the problem?
Also in the Xamarin Documentation the code is the same:
Xamarin.Auth documentation
Thanks to all

Xamarin.Auth 1.4.x supports Custom Tabs and SafariViewController, but no Xamarin.Forms support what most of the users want.
Xamarin.Forms support is in the 1.5.0-alpha soon to be released.
Samples extracted from the repo:
https://github.com/moljac/Xamarin.Auth.Samples.NugetReferences
ComicBook is Xamarin.Forms
Providers Traditional/Standard
Those will give you idea how to do it.

*Edit: The API below has probably changed with Xamarin.Auth 1.5. See moljac's answer.
For me, I am using the activity to start the login page and to pass in the context, but I am also running the code below from within a ContentPage renderer's OnElementChanged() method:
Android.App.Activity activity = Context as Android.App.Activity;
//Initialize authenticator
activity.StartActivity(auth.GetUI(activity));

get application path in asp.net vnext

I've been trying to open a file in asp.net 5 and have not been having a lot of success.
In the past you used Server.MapPath or HostingEnvironment.ApplicationPhysicalPath. They are both gone in the OWIN based framework.
There is a HostingEnvironment class but it's in the System.Aspnet but it needs to be initialized by the hosting environment (it no longer has a static member for ApplicationPhysicalPath but I'm guessing the WebRoot member does that now. The problem is I can't find a reference to it anywhere.
I've also looked at Context.GetFeature<> but it doesn't seem to have any feature that would show the application path, just request and response related info. The code listing the features can be found here.
<snark>Is the ability to work with files a discontinued feature in ASP.NET?</snark>
There is also the possibility that I can't brain very well right now and missed something.

You can get it from the ApplicationBasePath property of Microsoft.Framework.Runtime.IApplicationEnvironment serivce.
Example: https://github.com/aspnet/Mvc/blob/9f1cb655f6bb1fa0ce1c1e3782c43a2d45ca4e37/test/WebSites/FilesWebSite/Controllers/DownloadFilesController.cs#L28

There are two approaches now:
using Microsoft.Extensions.PlatformAbstractions;
public Startup(IApplicationEnvironment appEnv)
{
// approach 1
var path01 = PlatformServices.Default.Application.ApplicationBasePath;
// approach 2
var path02 = appEnv.ApplicationBasePath;
}

SignalR ASPNetHost does not exist in the current context

I've downloaded the latest SignalR code (as of 04/04/12) from GitHub as it now compiles with MonoDevelop so I can use it on OS X.
But while testing the new version with the SignalR.Sample example listed on the Getting Started page, it fails with the following error:
The name 'AspNetHost' does not exist in the current context
This occurs in StockTicker.cs here:
private static dynamic GetClients()
{
return AspNetHost.DependencyResolver.Resolve<IConnectionManager>().GetClients<StockTickerHub>();
}
Can anyone explain what has become of AspNetHost?
Suggestions on how to get the SignalR.Sample compiling would be very welcome.

I had the same problem and found that this was deprecated in SignalR 0.5. Here is an article detailing the changes.
Specific to your item, the change is from this:
public void PerformLongRunningHubOperation()
{
var clients = AspNetHost.DependencyResolver.Resolve<IConnectionManager>().GetClients<MyHub>();
clients.notify("Hello world");
}
To this in 0.5:
public void PerformLongRunningHubOperation()
{
IHubContext context = GlobalHost.ConnectionManager.GetHubContext<MyHub>();
context.Clients.notify("Hello world");
}

You're gonna need to read the code because the source isn't in sync with the docs. The docs are for the current release, not the actively developed.
Take a look at the asp.net sample to see the current API. It's not set in stone yet though.

OAuth in C# as a client

I've been given 6 bits of information to access some data from a website:
Website Json Url (eg: http://somesite.com/items/list.json)
OAuth Authorization Url (eg: http://somesite.com/oauth/authorization)
OAuth Request Url (eg: http://somesite.com/oauth/request)
OAuth Access Url (eg: http://somesite.com/oauth/access)
Client Key (eg: 12345678)
Client Secret (eg: abcdefghijklmnop)
Now, I've looked at DotNetOpenAuth and OAuth.NET libraries, and while I'm sure they are very capable of doing what I need, I just can't figure out how to use either in this way.
Could someone post some sample code of how to consume the Url (Point 1.) in either library (or any other way that may work just as well)?
Thanks!

I also just started working with OAuth a month ago and was also confused by all these libraries. One thing I realized about these libraries is that they're quite complicated (as you have found out). Another thing that makes it hard is that there wasn't a lot of example (it was worse in my case because I was trying to implement a Provider and not a Client).
Originally, I wanted to use the latest OAuth 2.0 but the only .NET library out there that implements it is DotNetOpenAuth. It's probably one of the most complete .NET OAuth library out there but it'll take too long for me to understand (due to not knowing WCF, MVC, etc). I have since downgraded to OAuth 1.0a because I found these examples for DevDefined OAuth. I don't know about you but I found it easier to learn from examples.
It looks like you only want to implement a Client so make sure to look at the Consumer examples. Try to compile the examples and ignore the Provider examples because you don't need them and it'll make you more confused. Be patient. If you're still confused, it might be a good idea to look at some of the libraries made for other languages as they might have easier to understand documentations.

OK, I know your last post was months ago, but in case you were still working on this (or for people like me who would have loved to see an answer to this question), here's some information regarding the NullReferenceException you encountered creating the OAuth request:
The null reference comes from the IServiceLocator that is used to resolve dependencies. If you don't explicitly pass one into the constructor, it uses the static property ServiceLocator.Current in the Microsoft.Practices.ServiceLocation namespace.
This is one of the many pitfalls of using static methods and global state, is you hide issues like this from the consumer of your API. So if you haven't specified a default service locator, then null is returned, resulting in the NullReferenceException.
So to fix this issue, I wired up an implementation of IServiceLocator that uses StructureMap (one of the many IoC containers available) as the container. Lastly, you will need to register instances for two interfaces: ISigningProvider and INonceProvider. Luckily, several standard implementations exist in the OAuth.Net.Components assembly, such as GuidNonceProvider and HmacSha1SigningProvider.
The resulting code looks like something like this:
var container = new Container();
container.Configure(a => a.For<INonceProvider>().Use<GuidNonceProvider>());
container.Configure(a => a.For<ISigningProvider>()
.Use<HmacSha1SigningProvider>()
.Named("signing.provider:HMAC-SHA1"));
var locator = new StructureMapAdapter(container);
ServiceLocator.SetLocatorProvider(delegate { return locator; });
I realize this isn't the final solution to your original question (I'm still working on getting it working myself), but I hope it gets you a few steps further. And if you've long abandoned this implementation altogether... well, happy coding anyway!

For OAuth 2.0:
I learned that it's easiest to just put up the authentication page in an HTML window then trap the returned access_token. You can then do that using in client-side web browser.
For example, in MonoTouch it would be:
//
// Present the authentication page to the user
//
var authUrl = "http://www.example.com/authenticate";
_borwser.LoadRequest (new NSUrlRequest (new NSUrl (authUrl)));
//
// The user logged in an we have gotten an access_token
//
void Success(string access_token) {
_web.RemoveFromSuperview();
var url = "http://www.example.com/data?access_token=" + access_token;
// FETCH the URL as needed
}
//
// Watch for the login
//
class Del : UIWebViewDelegate
{
public override void LoadingFinished (UIWebView webView)
{
try {
var url = webView.Request.Url.AbsoluteString;
var ci = url.LastIndexOf ("access_token=");
if (ci > 0) {
var code = url.Substring (ci + "access_token=".Length);
_ui.Success (code);
}
} catch (Exception error) {
Log.Error (error);
}
}
}