Test user exists with Powershell inputbox - windows

Question

I am trying to script a little application that would make possible to copy AD user's security groups and paste them to another one's profile.
I am good with this part but I want to make it a little bit more difficult by implementing some input boxes that would search for the AD user, errors out in case it does not exit in my AD and prompt once again until user has been found.
ipmo activedirectory
Add-type -assemblyName Microsoft.VisualBasic
Add-Type -AssemblyName System.Windows.Forms
$userref = [Microsoft.VisualBasic.Interaction]::Inputbox("Enter username
", "Prime User")
$usertar = [Microsoft.VisualBasic.Interaction]::Inputbox("Enter username",
"Target")
$userref, $usertar | foreach {
if ([bool](Get-ADUser -Filter {samaccountname -eq $_}) -ne $true) {
[System.Windows.Forms.MessageBox]::Show("This user does not exist!")
}
else {Write-Host "User Ok"}
}

Answer 1

Since you need to validate the existance of two AD users before the rest of your code can run, you are basically asking the same thing twice using inputboxes.
In that case I would suggest adding a small custom function to do that.
Something like this perhaps:
Import-Module ActiveDirectory
Add-type -AssemblyName Microsoft.VisualBasic
Add-Type -AssemblyName System.Windows.Forms
function Get-UserFromInputbox ([string]$Title) {
do {
$account = [Microsoft.VisualBasic.Interaction]::Inputbox("Enter user accountname", $Title)
# On Cancel the InputBox function simply returns an empty string.
# in that case, just return $null so the calling code can handle it
if ([string]::IsNullOrEmpty($account)) { return $null }
# Check if the user can be found
$user = Get-ADUser -Filter "SamAccountName -eq '$account'" –Properties MemberOf -ErrorAction SilentlyContinue
if (!$user) {
# If not found, show the same InputBox again until a valid
# accountname was given or the dialog is cancelled.
[System.Windows.Forms.MessageBox]::Show("User '$account' does not exist!")
}
}
while (!$user)
return $user
}
# Get the AD User object for the source user
$userref = Get-UserFromInputbox -Title "Source User"
if (!$userref) { exit }
# Ditto for the target user
$usertar = Get-UserFromInputbox -Title "Target User"
if (!$usertar) { exit }
# From here on you should have two valid AD user objects with the default properties `DistinguishedName, Enabled,
# GivenName, Name, ObjectClass, ObjectGUID, SamAccountName, SID, Surname, UserPrincipalName`.
# In the function we extended that to also have the `MemberOf` property.
Hope this helps