Codeについて(J-son)

ノンプログラマーの超初心者です。

下のCodeをもとに

PowerShell
1(
2    [Parameter (Mandatory = $false)]
3    [object] $WebhookData
4)
5
6# If runbook was called from Webhook, WebhookData will not be null.
7if ($WebhookData) {
8
9    # Check header for message to validate request
10    if ($WebhookData.RequestHeader.message -eq 'StartedbyContoso')
11    {
12        Write-Output "Header has required information"}
13    else
14    {
15        Write-Output "Header missing required information";
16        exit;
17    }
18
19    # Retrieve VMs from Webhook request body
20    $vms = (ConvertFrom-Json -InputObject $WebhookData.RequestBody)
21
22    # Authenticate to Azure by using the service principal and certificate. Then, set the subscription.
23
24    Write-Output "Authenticating to Azure with service principal and certificate"
25    $ConnectionAssetName = "AzureRunAsConnection"
26    Write-Output "Get connection asset: $ConnectionAssetName"
27
28    $Conn = Get-AutomationConnection -Name $ConnectionAssetName
29            if ($Conn -eq $null)
30            {
31                throw "Could not retrieve connection asset: $ConnectionAssetName. Check that this asset exists in the Automation account."
32            }
33            Write-Output "Authenticating to Azure with service principal."
34            Add-AzAccount -ServicePrincipal -Tenant $Conn.TenantID -ApplicationId $Conn.ApplicationID -CertificateThumbprint $Conn.CertificateThumbprint | Write-Output
35
36        # Start each virtual machine
37        foreach ($vm in $vms)
38        {
39            $vmName = $vm.Name
40            Write-Output "Starting $vmName"
41            Start-AzVM -Name $vm.Name -ResourceGroup $vm.ResourceGroup
42        }
43}
44else {
45    # Error
46    write-Error "This runbook is meant to be started from an Azure alert webhook only."
47}