Virtual Geek

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#
function Show-ADGroupTreeViewMembers {
#requires -version 4
<#
.SYNOPSIS
    Show DownStream tree view hierarchy of members groups recursively of a Active Directory Group.
.DESCRIPTION
    The Show-ADGroupTreeViewMembers list all nested group list of a AD user. It requires only valid parameter AD username, 
.PARAMETER GroupName
    Prompts you valid active directory Group name. You can use first character as an alias, If information is not provided it provides 'Domain Admins' group information.
.INPUTS
    Microsoft.ActiveDirectory.Management.ADGroup
.OUTPUTS
    Microsoft.ActiveDirectory.Management.ADGroup
    Microsoft.ActiveDirectory.Management.ADuser
.NOTES
    Version:        2.0
    Author:         Janvi Udapi
    Creation Date:  10 September 2017
    Purpose/Change: Get the nested downstream group info of member
    Useful URLs: http://vcloud-lab.com
.EXAMPLE
    PS C:\>.\Show-ADGroupTreeViewMembers -GroupName 'Administrators'

    This list all the upstream memberof group of a Group.
#>

[CmdletBinding(SupportsShouldProcess=$True,
    ConfirmImpact='Medium',
    HelpURI='http://vcloud-lab.com')]
Param
(
    [parameter(Position=0, ValueFromPipelineByPropertyName=$true, ValueFromPipeline=$true, HelpMessage='Type valid AD Group')]
    [alias('Group')]
    [String]$GroupName = 'Domain Admins',
    [parameter(DontShow=$True)]
    [alias('U')]
    $UpperValue = [System.Int32]::MaxValue,
    [parameter(DontShow=$True)]
    [alias('L')]
    $LowerValue = 2
)
    begin {
        if (!(Get-Module Activedirectory)) {
            try {
                Import-Module ActiveDirectory -ErrorAction Stop 
            }
            catch {
                Write-Host -Object "ActiveDirectory Module didn't find, Please install it and try again" -BackgroundColor DarkRed
                Break
            }
        }
        try {
            $Group =  Get-ADGroup $GroupName -Properties members -ErrorAction Stop 
            $Members = $Group | Select-Object -ExpandProperty members 
            $rootname = $Group.Name
        }
        catch {
            Write-Host -Object "`'$GroupName`' groupname doesn't exist in Active Directory, Please try again." -BackgroundColor DarkRed
            $result = 'Break'
            Break
        }
    }
    Process {
        $Minus = $LowerValue - 2
        $Spaces = " " * $Minus
        $Lines = "__"
        "{0}{1}{2}{3}" -f $Spaces, '|', $Lines, $rootname        
        $LowerValue++
        $LowerValue++
        if ($LowerValue -le $UpperValue) {
            foreach ($member in $Members) {
                try {
                    $UpperGroup = Get-ADGroup $member -Properties Members, Memberof -ErrorAction Stop
                }
                catch {
                    Continue
                }
                #$LowerGroup = $UpperGroup |
                $LowerGroup = $UpperGroup | Get-ADGroupMember
                $LoopCheck = $UpperGroup.memberof | ForEach-Object {$_ -contains $lowerGroup.distinguishedName}
                if ($LoopCheck -Contains $True) {
                    $rootname = $UpperGroup.Name
                    Write-Host "Loop found on $($UpperGroup.Name), Skipping..." -BackgroundColor DarkRed
                    Continue
                }
                #"xxx $($LowerGroup.name)"
                #$Member
                #"--- $($UpperGroup.Name) `n"
                Show-ADGroupTreeViewMembers -GroupName $member -LowerValue $LowerValue -UpperValue $UpperValue
            } #foreach ($member in $MemberOf) {
        }
    } #Process
}

  Show-ADGroupTreeViewMembers -GroupName Administrators