Add Logic for token tests

ZertoApiWrapper/Private/Invoke-ZARestRequest.ps1

@@ -7,14 +7,26 @@ function Invoke-ZARestRequest {
         [string]$contentType = "application/json"
     )
 
-    $submittedUri = "https://analytics.api.zerto.com/v2/{0}" -f $uri
-    if ($PSVersionTable.PSVersion.Major -ge 6) {
-        Invoke-RestMethod -Uri $submittedUri -Method $method -Body $body -Headers $Script:zaHeaders -ContentType $contentType -TimeoutSec 100
+    # Check to see if the required variables are present and currently valid
+    if ( -not ((Test-Path variable:script:zaLastActionTime) -and (Test-Path variable:script:zaHeaders)) ) {
+        Write-Error -Message "Zerto Analytics Connection does not Exist. Please run Connect-ZertoAnalytics first to establish a connection"
+        break
+    } elseif ( (Test-Path variable:script:zaHeaders) -and $([datetime]$script:zaLastAction).addMinutes(60) -lt $(get-date) ) {
+        Write-Error -Message "Authorization Token has Expired. Please re-authorize to the Zerto Virtual Manager"
+        break
     } else {
-        if ([String]::IsNullOrEmpty($body)) {
-            Invoke-RestMethod -Uri $submittedUri -Method $method -Headers $Script:zaHeaders -ContentType $contentType -TimeoutSec 100
+        # Update the last action time and submit the request based on PS Version.
+        Set-Variable -Name zaLastActionTime -Scope Script -Value $(Get-date).Ticks
+        $submittedUri = "https://analytics.api.zerto.com/v2/{0}" -f $uri
+        if ($PSVersionTable.PSVersion.Major -ge 6) {
+            Invoke-RestMethod -Uri $submittedUri -Method $method -Body $body -Headers $Script:zaHeaders -ContentType $contentType -TimeoutSec 100
         } else {
-            Invoke-RestMethod -Uri $submittedUri -Method $method -Headers $Script:zaHeaders -ContentType $contentType -TimeoutSec 100 -Body $body
+            # With PS 5, you cannot ship a $null body, check for $body variable and select correct Invoke request.
+            if ([String]::IsNullOrEmpty($body)) {
+                Invoke-RestMethod -Uri $submittedUri -Method $method -Headers $Script:zaHeaders -ContentType $contentType -TimeoutSec 100
+            } else {
+                Invoke-RestMethod -Uri $submittedUri -Method $method -Headers $Script:zaHeaders -ContentType $contentType -TimeoutSec 100 -Body $body
+            }
         }
     }
-}
+}