Dynamically cast a string to an integer in a runbook

Question

I am trying to create a script that updates an IP address in a NSG in Azure using a webhook connected to a runbook.

My powershell script contains the webhook which I run locally:

Write-Output "Changing IP Address..."

$uri = "https://webhookaddress"

$nsg = @{
SourceAddressPrefix = ([System.String[]] @("123.123.123.12"))
Name = "NSG_Rule_Name"
}

$body = ConvertTo-Json -InputObject $nsg
$header = @{ message="StartedbyContoso"}
$response = Invoke-WebRequest -Method Post -Uri $uri -Body $body -Headers $header
$jobid = (ConvertFrom-Json ($response.Content)).jobids[0]

The runbook input parameter accepts the WEBHOOKDATA as JSON. Sample JSON:

{"WebhookName":"UpdateIPAddress","RequestBody":"{ "Name": "NSG_Rule_Name", "SourceAddressPrefix": [ "123.123.123.12" ] }","RequestHeader":{"Connection":"Keep-Alive","Host":"33ce53a59d11.webhook.ne.azure-automation.net","User-Agent":"Mozilla/5.0","message":"StartedbyContoso","x-ms-request-id":"7c7c8934-0445-478c-84fd-a6761eadc79b"}}

When trying to pass $nsg.SourceAddressPrefix in the runbook, it fails. If I don't cast the IP to a string in the webhook script, it will fail to be in the JSON. So now I'm trying to cast the string back to an integer within the runbook:

$nsg = Get-AzNetworkSecurityGroup -Name "NSG_Name" -ResourceGroupName "RG_Name"
$nsg | Get-AzNetworkSecurityRuleConfig -Name "NSG_Rule_Name"
Set-AzNetworkSecurityRuleConfig -Name "NSG_Rule_Name" -NetworkSecurityGroup $nsg -SourceAddressPrefix = $nsg.SourceAddressPrefix

How can I set this up to pass an IP address through to a runbook and then get the runbook to read the IP address?

Answer

Maybe this blogpost is helpful:

https://blog.ctglobalservices.com/azure/jgs/azure-automation-using-webhooks-part-1-input-data/

From this blog post I got the information how to provide Firstname and Lastname via webhook for a "Create User" runbook.

## These are just snippets for demoing - removed some lines of the full script

##First snippet
[CmdletBinding()]
Param
([object]$WebhookData)
$VerbosePreference = 'continue'

if ($WebHookData)
    {
    $WebhookName     =     $WebHookData.WebhookName
    $WebhookHeaders  =     $WebHookData.RequestHeader
    $WebhookBody     =     $WebHookData.RequestBody

    $From = $WebhookHeaders.From
    $Input = (ConvertFrom-Json -InputObject $WebhookBody)
    Write-Verbose "WebhookBody: $Input"
    }

## Second Snippet

$firstname = $Input.FirstName
$lastname = $Input.LastName

## Third Snippet
$adDisplayName = $firstname +" "+$lastname
$newUserName = "$firstname.$lastname"

## Fourth snippet
New-ADuser -Path "$adOU"`
                    -Name "$adDisplayName"`
                    -DisplayName "$adDisplayName"`
                    -GivenName "$firstName"`
                    -Surname "$lastName"`
                    ### some more things

(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)

Regards
Andreas Baumgarten

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Dynamically cast a string to an integer in a runbook

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