PSCONF EU: Use PowerShell to read Inbox and draw a contest Winner

I was at the PSCONF EU 2022 as a Premium Sponsor with au2mator. We had a Contest, where the Attendees need to sign up and an email was sent.

The Challenge was, to select 3 Random Winners from that list. As we are at PowerShell Conference, we wanted to find a PowerShell way to solve this.

So we created an Azure App Registration and read the Inbox, did some formatting, and get 3 Random Names for the Comic, and 3 random Names for the BaseCaps.


If you are not familiar with Azure App Regs, and how all this work together, see my Blogs Post for Details:

To learn more from Microsoft GRAPH API, see my Blog Series:
Part 1 – Authentication and Azure App – Use Microsoft Graph API with PowerShell – Part 1 » TechGuy
Part 2 – Oauth2.0 – Use Microsoft Graph API with PowerShell – Part 2 » TechGuy
Part 3 – First Powershell Script to get a Teams Lis and Walkthrough – Use Microsoft Graph API with PowerShell – Part 3 » TechGuy
Part 4 – this one – Use Microsoft Graph API with PowerShell – Part 4 » TechGuy

The Script

$clientID = "your-ClientID"
$Clientsecret = "your-Secret"
$tenantID = "your-TenantID"



#Connect to GRAPH API
$tokenBody = @{
    Grant_Type    = "client_credentials"
    Scope         = ""
    Client_Id     = $clientId
    Client_Secret = $clientSecret
$tokenResponse = Invoke-RestMethod -Uri "$tenantID/oauth2/v2.0/token" -Method POST -Body $tokenBody
$headers = @{
    "Authorization" = "Bearer $($tokenResponse.access_token)"
    "Content-type"  = "application/json"

$Inboxfolder=(Invoke-RestMethod -Method GET -Uri $URLReadFolder -Headers $headers).value | Where-Object -Property displayname -Value Inbox -eq

$URLReadMail="$BaseURL/users/$UserUPN/mailFolders/$($`$filter=startswith(Subject,'au2mator - Self Service Portal')"
$Mails=Invoke-RestMethod -Method GET -Uri $URLReadMail -Headers $headers

foreach ($M in $Mails.value)
    $Mailarray+=$M.body.content.substring(0,$M.body.content.IndexOf(")")+1).replace("From: ","")
"The Comic Winners are:"
$Comicwinners=$MailArray | Get-Random -Count 3

$MailArray = $MailArray |Where-Object { $Comicwinners -notcontains $_ }
$BaseCapWinners=$MailArray | Get-Random -Count 3
"The BaseCap Winners are:"

GitHub Repo

Here you can find the GitHub Repo: Seidlm/PowerShell-Tools ( with the Script

Michael Seidl aka Techguy
au2mate everything

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