Validate identifiers are present

ZertoApiWrapper/Public/Start-ZertoCloneVpg.ps1

@@ -24,18 +24,35 @@ function Start-ZertoCloneVpg {
 
     begin {
         $baseUri = "vpgs"
-
         $vpgInfo = Get-ZertoVpg -name $vpgName
+        if ( -not $vpgInfo ) {
+            Write-Error "VPG: $vpgName could not be found. Please check the name and try again."
+        }
         $vpgIdentifier = $vpgInfo.vpgIdentifier
         if ( $PSBoundParameters.ContainsKey('datastoreName') ) {
             $recoverysiteIdentifier = $vpgInfo.recoverysite.identifier
             $recoverySiteDatastores = Get-ZertoVirtualizationSite -siteIdentifier $recoverysiteIdentifier -datastores
             $datastoreIdentifier = $($recoverySiteDatastores | Where-Object {$_.datastoreName -like $datastoreName}).DatastoreIdentifier
+            if ( -not $datastoreIdentifier ) {
+                Write-Error "Datastore: $datastoreName is not a valid datastore. Please check the name and try again." -ErrorAction Stop
+            }
         }
         if ( $PSBoundParameters.ContainsKey('vmName') ) {
-            $vmIdentifiers = @()
-            $vmIdentifiers = foreach ( $name in $vmName ) {
-                $(Get-ZertoProtectedVm -vmName $name).vmIdentifier
+            $vpgVmInformation = Get-ZertoProtectedVm -vpgName $vpgName
+            [System.Collections.ArrayList]$vmIdentifiers = @()
+            foreach ( $name in $vmName ) {
+                $selectedVm = $vpgVmInformation | Where-Object {$_.VmName.toLower() -eq $name.toLower()}
+                if ($null -eq $selectedVm) {
+                    Write-Error "VM: $name NOT found in VPG $vpgName. Check the name and try again." -ErrorAction Stop
+                } elseif ($vmIdentifiers.Contains($selectedVm.vmIdentifier.toString())) {
+                    Write-Error "VM: $($selectedVm.VmName) specified more than once. Please check parameters and try again." -ErrorAction Stop
+                } else {
+                    $vmIdentifiers.Add($selectedVm.vmIdentifier.toString()) | Out-Null
+                }
+            }
+            $body['VmIdentifiers'] = $vmIdentifiers
+            if ($checkpointIdentifier) {
+                $body['CheckpointIdentifier'] = $checkpointIdentifier
             }
         }
     }