List all my Azure websites using an Azure Powershell Function - powershell

Question

Im testing the new Azure Functions, and would like to write a function that return all my Azure Websites. But needless to say I run into some problems, and documantation is still minimal.
run.ps1
# Get the input request
$in = Get-Content $req -Raw | ConvertFrom-Json
Write-Output "Loading..."
Get-AzureRmSubscription -SubscriptionId $in.SubscriptionId | Select-AzureRmSubscription
$Result = Get-AzureWebsite
Write $Result
This function take the subscription id as a parameter, and is supposed to list the available websites. But I get this exception.
2017-06-13T12:43:57.763 Get-AzureRmSubscription : Run Login-AzureRmAccount to login.
So I tried to add Login-AzureRmAccount but then I get.
2017-06-13T12:45:04.959 Login-AzureRmAccount : Error HRESULT E_FAIL has been returned from a call to a COM component.
And that is where I stand now.
Update
After help from #4c74356b41 I now am able to login. My code for logging in looks like this.
$subscriptionId = "<SubscriptionId>"
$tenantid = "<TenantId>"
$clientid = "<ApplicationId>"
$password = "<Password>"
$userPassword = ConvertTo-SecureString -String $password -AsPlainText -Force
$userCredential = New-Object -TypeName System.Management.Automation.PSCredential -ArgumentList $clientid, $userPassword
Add-AzureRmAccount -TenantId $tenantid -ServicePrincipal -SubscriptionId $subscriptionId -Credential $userCredential
I can see that this work when I test the code. But as soon as I add this line.
Select-AzureSubscription -Current -SubscriptionId $subscriptionId
I get this exception.
Select-AzureSubscription : The subscription id <SubscriptionId> doesn't exist.
Parameternavn: id
At line:11 char:1
+ Select-AzureSubscription -Current -SubscriptionId $subscriptionId
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : CloseError: (:) [Select-AzureSubscription], ArgumentException
+ FullyQualifiedErrorId : Microsoft.WindowsAzure.Commands.Profile.SelectAzureSubscriptionCommand
I also tried to add this line.
Get-AzureRmSubscription –SubscriptionId $subscriptionId | Select-AzureRmSubscription
Which look like is working, it only thows a warning WARNING: Unable to acquire token for tenant 'Common' but still list the correct subscription details without any exceptions.
Then when I try
Get-AzureWebsite
I get this exception.
Get-AzureWebsite : No default subscription has been designated. Use Select-AzureSubscription -Default <subscriptionName> to set the default subscription.
At line:15 char:1
+ Get-AzureWebsite
+ ~~~~~~~~~~~~~~~~
+ CategoryInfo : CloseError: (:) [Get-AzureWebsite], ApplicationException
+ FullyQualifiedErrorId : Microsoft.WindowsAzure.Commands.Websites.GetAzureWebsiteCommand

Answer 1

Well, how do you expect to work with your subscription without authenticating? would you like anybody to be able to modify your resources without any validation at all? so you need to authenticate before doing anything.
Working with powershell in Azure Function is no different from working with powershell on your machine (except module management).
To login you could use service principal auth ang login with something like:
Add-AzureRmAccount -TenantId $tenantid -ServicePrincipal -SubscriptionName $name `
-Credential ([pscredential]::new($clientid,(ConvertTo-SecureString -String $password -AsPlainText -Force)))
you can replace variables (hardcoded in the code) with environment variables.

Answer 2

Add 4c74356b41's answer, Get-AzureWebsite is an Azure Classic mode cmdlet. Now, you login your ARM subscription, so, it requires you login classic subscription. Select-AzureSubscription is a classic cmdlet that use to select classic subscription.
In Azure ARM mode, website is renamed Webapp, you could check Azure App Service announcement.
So, if you want to list your all webapp, you should use cmdlet Get-AzureRmWebApp.
More information please refer to this link: Using Azure Resource Manager-Based PowerShell to Manage Azure Web Apps.