Sql server PowerShell/SQL脚本自动化-作业SQL报表服务器

这是我发现的一段代码，用于在SQL report server环境中的每个文件夹中添加或删除单个广告帐户/组。我是新手，有没有人可以给我解释一下代码。谢谢

Clear-Host
$ReportServerUri = 'http://PorteousSQL1/ReportServer/ReportService2010.asmx?wsdl'
$InheritParent = $true
$GroupUserName = 'Domain\Deploy'
$RoleName = 'Publisher'
 
$rsProxy = New-WebServiceProxy -Uri $ReportServerUri -UseDefaultCredential
$type = $rsProxy.GetType().Namespace;
$policyType = "{0}.Policy" -f $type;
$roleType = "{0}.Role" -f $type;
#List out all subfolders under the parent directory
$items = $rsProxy.ListChildren("/", $true) | `
         SELECT TypeName, Path, ID, Name | `
         Where-Object {$_.typeName -eq "Folder"}
#Iterate through every folder 
foreach($item in $items)
{
    $Policies = $rsProxy.GetPolicies($Item.Path, [ref]$InheritParent)
    #Skip over folders marked to Inherit permissions. No changes needed.
    if($InheritParent -eq $false)
    {
        #Return all policies that contain the user/group we want to add
        $Policy = $Policies | 
            Where-Object { $_.GroupUserName -eq $GroupUserName } | 
            Select-Object -First 1
        #Add a new policy if doesnt exist
        if (-not $Policy) 
        {
            $Policy = New-Object ($policyType)
            $Policy.GroupUserName = $GroupUserName
            $Policy.Roles = @()
            #Add new policy to the folder's policies
            $Policies += $Policy
        }
        #Add the role to the new Policy
        $r = $Policy.Roles |
            Where-Object { $_.Name -eq $RoleName } |
            Select-Object -First 1
            if (-not $r) 
        {
                $r = New-Object ($roleType)
                $r.Name = $RoleName
                $Policy.Roles += $r
            }
        #Set folder policies
        $rsProxy.SetPolicies($Item.Path, $Policies);
    }
}