Remove Sharepoint permissions with Powershell when folder is created in Sharepoint Library - powershell

Question

I have a Sharepoint Library, which I have mapped out to my Z:\ drive.
I have a script, that drops user specific files, in folders that I create with the following chunk of Powershell:
#If the output path doesn't exist, make it quietly.
If(!(Test-Path "z:\$strOwnerName")){$null = New-Item "Z:\$strOwnerName" -ItemType directory}
How can I (if at all possible) modify this line to remove/restrict permissions for everyone in Sharepoint, aside from the user for which the folder is being created? The folder name, will always be the users AD name.

Answer 1

I'd start with a folder that has just very basic permissions, so you have something to copy. Then add the permission for the new folder's owner onto the ACL object. Lastly create the folder and apply the modified ACL to it. I Selected Read, Write, Modify, and DeleteSubdirectoryAndFiles but you can pick and choose your security settings for the user from this list.
$colRights = [System.Security.AccessControl.FileSystemRights]"Read, Write, Modify, DeleteSubdirectoriesAndFiles"
$InheritanceFlag = [System.Security.AccessControl.InheritanceFlags]::None
$PropagationFlag = [System.Security.AccessControl.PropagationFlags]::None
$objType =[System.Security.AccessControl.AccessControlType]::Allow
$objUser = New-Object System.Security.Principal.NTAccount("DigitalGhost\$strOwnerName")
$objACE = New-Object System.Security.AccessControl.FileSystemAccessRule `
($objUser, $colRights, $InheritanceFlag, $PropagationFlag, $objType)
$objACL = Get-ACL "Z:\ACLSource"
$objACL.AddAccessRule($objACE)
#If the output path doesn't exist, make it quietly.
If(!(Test-Path "z:\$strOwnerName")){$null = New-Item "Z:\$strOwnerName" -ItemType directory}
Set-ACL "Z:\$strOwnerName" $objACL
And of coarse, credit where credit is due... I picked most of that up directly a while ago off of this TechNet Windows PowerShell Tip of the Week.