Import-ExportedPolicies.ps1

<#
.Synopsis
   Imports all GPO exports from an input folder.
.DESCRIPTION
   Imports all GPO exports from an input folder and allow for automatic linking to a given Organizational Unit.
.EXAMPLE
   .\Import-ExportedPolicies.ps1 -GpoBackupFolder C:\Temp\GPO

   Imports all policies that where exported to C:\Temp
.EXAMPLE
   .\Import-ExportedPolicies.ps1 -GpoBackupFolder C:\Temp\GPO -Prefix "MyTest-" -OrganizationUnit "OU=Workstations,DC=contoso,DC=com"

   Imports all policies that where exported to C:\Temp with Prefix "MyTest-". Additionally, all objects will be linked to "OU=Workstations,DC=contoso,DC=com"
.COMPONENT
   Die Komponente, zu der dieses Cmdlet gehört
#>
function Import-ExportedPolicies {
    [CmdletBinding(SupportsShouldProcess)]
    param (
        # This parameter contains the path to one or multiple GPO export folders
        [Parameter(Mandatory,ValueFromPipeline)]
        [ValidateScript({Test-Path $_})]
        [String]$GpoBackupFolder,

        # This parameter contains the domain name where to import the GPO exports
        [Parameter(Mandatory=$false)]
        [String]$DomainName = $env:USERDOMAIN,

        # This parameters specifies the Distinguished Name of the Organizational Unit the new objects will be linked
        [Parameter(Mandatory=$false)]
        [String]$OrganizationalUnit,

        # This parameter contains the prefix that will be used for the new GPO names
        [Parameter(Mandatory=$false)]
        [String]$GpoPrefix
    )

    begin {
        function Get-GpoNameFromReport {
            param (
                [Parameter(Mandatory)]
                [String]$GpoReportPath
            )

            $reportXml = $GpoReportPath
            <#$xmlDoc = [System.Xml.XmlDocument]::new()
            $xmlDoc.Load($reportXml)
            #>
            [xml]$xmlDoc = Get-Content $GpoReportPath

            $gpoName = $xmlDoc.GPO.Name

            return $gpoName
        }
    }

    process {
        $gpoArr = Get-ChildItem $GpoBackupFolder -Directory

        foreach ($gpoExport in $gpoArr) {
            $reportXmlFile = Get-ChildItem -Path $gpoExport.FullName -Filter "gpreport.xml"
            if (-not ($GpoPrefix)) {
                $gpoName = (Get-GpoNameFromReport -GpoReportPath $reportXmlFile.FullName)
            
            }
            else {
                $gpoName = "$GpoPrefix" +  (Get-GpoNameFromReport -GpoReportPath $reportXmlFile.FullName)
            }

            if ($PSCmdlet.ShouldProcess("Importing Group Policy Object $gpoName")) {
                $newGpoObject = New-GPO -Name $gpoName -Domain $domainName -Comment "Imported from $GpoBackupFolder on $(Get-Date -Format yyyyMMdd) by $env:USERNAME"
                Import-GPO -Path $GpoBackupFolder -TargetName $gpoName -Domain $DomainName -BackupId $gpoExport.Name
            }

        
            if ($OrganizationalUnit) {
                if ($PSCmdlet.ShouldProcess("Linking Group Policy Object $gpoName to $OrganizationalUnit")) {
                    New-GPLink -Guid $newGpoObject.id -Target $OrganizationalUnit -LinkEnabled Yes -Domain $DomainName
                }
            }
        }
    }
}