canceling get-credentials in loop - powershell

Question

I am working on developing PowerShell script to automate a task on a remote server by using Invoke-Command with WinRM.
The script will take the server IP, test WinRM and "Get-Credential" cmdlet to establish session and use Invoke-Command to run another script on remote server. I have made significant progress of what I want to achieve, however, I am having trouble on how to setup the code so that when I press the "Cancel" or "X" button on Get-Credential prompt it should abort the script and return to the regular PowerShell command line prompt.
Below is what I have so far, I have erased the comments and description of the code to keep the number of words less in here.
function SS
{
Add-Type -AssemblyName System.Windows.Forms
$BInput = [System.Windows.Forms.MessageBox]::Show('Do you want to proceed?', 'Confirmation',[System.Windows.Forms.MessageBoxButtons]::YesNo)
switch ($BInput)
{
"Yes" {
while ($true)
{
$server=Read-Host "Enter Server IP Address"
set-item -Path WSMan:\localhost\Client\TrustedHosts -Value "$server" -Force
if(Test-WSMan -ComputerName $server -ErrorAction SilentlyContinue)
{
Write-Host "$server is accessible, enter credentials to connect"
while ($true)
{
$creden=Get-Credential -Message "Please enter the server credentials that you want to connect"
$serversession = New-Pssession -ComputerName $server -Credential $creden -ErrorAction SilentlyContinue
if(-not($serversession))
{
write-warning "Credentials are not valild, please try again"
}
else
{
write-host "$server is connected, starting the workflow ......"
Invoke-Command -Session $serversession -FilePath "C:\Temp\XXX.ps1"
}
}
Break
}
else
{
write-host "Windows Remote Management (WinRM) protocol is not running, please check service and confirm."
}
}
Get-Pssession | Remove-PSSession
}
"No" {
Break
}
}
}
I understand I have to apply the changes / logic after this line
$creden=Get-Credential -Message "Please enter the server credentials that you want to connect"
But can't seem to find it yet. I looked online and have taken different approaches but no success so far. I would like to have opinions or recommendations on how to tackle this, appreciate your help.
Thanks

Answer 1

What i'm seeing is that you may be thinking too much into it. A simple if statement should do the trick, try:
$creden=Get-Credential -Message "Please enter the server credentials that you want to connect"
if(!$creden){break}

Answer 2

Continuing from my comment.
Try this refactor of your use case.
Point of note: Note fully tested since I do not have an environment at this time to test.
Function Start-WorkFlow
{
<#
.Synopsis
Execute a workflow
.DESCRIPTION
Sets up a WinRM session to a remote host to execute the defined workflow
.EXAMPLE
Start-WorkFlow
.EXAMPLE
swf
.INPUTS
Remote host IPAddress
Remove host credentials
.OUTPUTS
Resutls of teh workflow
.NOTES
V 0.0.1 - Prototype script. Clean-Up before production use
.COMPONENT
Stand-alone script
.ROLE
Administrative actions
.FUNCTIONALITY
Implemetned error logic for each code block
Restrict the user input to only be a proper IPAddress
Validate TCPIP state
Validate WSman state
Establish a new session
Process workflow
Exit session
#>
[cmdletbinding(SupportsShouldProcess)]
[Alias('swf')]
Param
(
)
If ((Read-Host -Prompt 'Do you want to proceed: [Yes/No]') -eq 'No' )
{Break}
Else
{
Do {$RemoteServerIPAddress = (Read-Host -Prompt 'Enter Server IP Address')}
Until ($RemoteServerIPAddress -match "^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$")
Get-ChildItem -Path 'WSMan:\localhost\Client\TrustedHosts'
Try
{
(Test-Connection -ComputerName $RemoteServerIPAddress -Count 1 -ErrorAction Stop).IPV4Address
# Set-Item -Path 'WSMan:\localhost\Client\TrustedHosts' -Value $RemoteServerIPAddress -Force
Get-ChildItem -Path 'WSMan:\localhost\Client\TrustedHosts'
Try
{
Test-WSMan -ComputerName $RemoteServerIPAddress -ErrorAction Stop
"$RemoteServerIPAddress is accessible, enter credentials to connect"
Do
{
$Creds = $null
$CredMesssage = 'Please enter the remote server credentials that you want to connect.'
$CredMesssage = "$CredMesssage If credentials are not valid, you will be prompted to re-enter them."
$Creds = Get-Credential -Message $CredMesssage
if(-Not $creds)
{
Write-Warning -Message 'Credential request cancelled.'
Start-Sleep -Seconds 3
Exit
}
$NewPSSessionSplat = #{
ComputerName = $RemoteServerIPAddress
Credential = $Creds
Name = 'RemoteSessionName'
ErrorAction = 'Stop'
}
New-PSSession $NewPSSessionSplat
}
Until (Get-PSSession -Name 'RemoteSessionName')
"$RemoteServerIPAddress is connected, starting the workflow ......"
Invoke-Command -Session $RemoteServerSession -FilePath 'C:\Temp\XXX.ps1'
}
Catch
{
Write-Warning -Message 'Session connection results:'
$PSitem.Exception.Message
}
Finally
{
Get-PSSession |
Remove-PSSession -ErrorAction SilentlyContinue
}
}
Catch
{
Write-Warning -Message "
The remote server $RemoteServerIPAddress is not available
Exiting the session."
Start-Sleep -Seconds 3
Exit
}
}
}
Start-WorkFlow